2001 ROCHESTER, NEW YORK (ROC)



Rochester and the Genesee Valley experience a fairly humid, continental type climate, which is strongly modified by the proximity of the Great Lakes. Precipitation is rather evenly distributed throughout the year in quanity, but frequency is much higher during the cloudy winter months than in the sunny ones. Snowfall is heavy, but is highly variable over short distances.

Winters in general are cloudy, cold and snowy..but are changeable and include frequent thaws and rain as well. Snow covers the ground more often than not from christmas into early March..but periods of bare ground are not uncommon. About half of the annual snowfall comes from "lake–effect" process and is very localized. This feature develops when cold air crosses the warmer lake waters and becomes saturated..creating clouds and precipitation downwind. The exact location of these snowbands are determined by the direction of the wind. Areas east of Rochester receive the most snow from this process..as northwest winds have a longer "fetch" off Lake Ontario..while areas south of the city get somewhat less. Lake Erie can even contribute some snow from this process if a west or southwest wind is storng enough. Since Lake Ontario does not freeze in most winters..this Lake effect machine can remain active throughout the winter. The Rochester area is also subject to occasional general or "synoptic" snowfalls..but the worst effects from these usually pass by to the east. Total season snowfall ranges from 70 inches south of the city to about 90 inches in Rochester to over 120 inches along the lakeshore east of the city. About 50 inches of this total results from general snows..the rest is due to the Lake effect machine. The lake does modify any extreme cold as the mercury falls below zero on only anout six nights in an average winter..with anything below –10 extremely rare.

Spring comes slowly to the region. The last frosts usually occur by April 30 near Lake Ontario..but as late as mid–May south of the Thruway. The spring months are actually the driest months statistically, due in part to the stabilizing effects of the Great Lakes, although soils are wet. Sunshine increases markedly in May.

Summers are warm and sunny across the region. The average temperature is in the 70 to 72 degree range. Rain can be expected on every third or fourth day..almost always in the form of showers and thunderstorms. This activity is more common inland than near the Lake. Completely overcast days in summer are rare. Severe weather is not common..but a few cases of damaging winds and small tornadoes occur each year. The greatest risk of this type of activity is south of the Thruway. There usually are several periods of uncomfortably warm and muggy weather in an average summer..but only about nine days reach 90–degree mark in an average year. Still, the area usually experiences some of the most delightful summer weather in the East.

Autumn is pleasant, but rather brief. Mild and dry conditions predominate through September and much of October, but colder airmasses cross the Great Lakes with increasing frequency starting in late October, and result in a drastic increase in cloud cover across the region in late October and early November. Although the first frosts may not occur until late October near Lake Ontario, the firstlake effect snows of the season follow soon after…usually by mid November. These early snows melt off quickly, with a general snow cover seldom established before mid December. The growing season is relatively long for the latitude…average about 180 days. The long growing season…combined with ample spring moisture and abundant summer sunshine…is beneficial for the many fruit orchards and wineries…especially near the Lake Ontario shore and Finger Lakes.

NORMALS, MEANS, AND EXTREMES

ROCHESTER, NY (ROC)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 14768

43 07′ 00″ N  77 40′ 36″ W  GRND:  585  BARO: � A0;588  EASTERN  (UTC + 5)

2001 Rochester, New York (ROC)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 30.9 32.5 42.7 55.9 67.8 75.8 80.7 78.1 71.8 60.5 47.8 35.8 56.7
MEAN DAILY MAXIMUM 54 31.4 33.3 41.8 55.8 67.8 77.6 81.9 79.8 72.0 61.2 47.8 36.2 57.2
HIGHEST DAILY MAXIMUM 61 74 73 84 93 94 100 98 99 99 91 81 72 100
YEAR OF OCCURRENCE 1950 1997 1945 1990 1987 1953 1993 1948 1953 1951 1950 1982 JUN 1953
MEAN OF EXTREME MAXS. 54 53.2 54.0 68.3 78.9 85.9 91.1 92.6 90.8 87.9 80.1 69.0 57.1 75.7
NORMAL DAILY MINIMUM 30 16.3 16.6 25.7 35.9 46.3 54.3 59.6 57.8 51.7 41.6 33.3 22.4 38.5
MEAN DAILY MINIMUM 54 17.1 17.7 25.3 36.1 46.2 55.6 60.4 58.9 51.5 41.6 33.1 23.0 38.9
LOWEST DAILY MINIMUM 61 -17 -19 -7 13 26 35 42 36 28 20 5 -16 -19
YEAR OF OCCURRENCE 1994 1979 1999 1982 1979 1949 1963 1965 1947 1972 1971 1942 FEB 1979
MEAN OF EXTREME MINS. 54 -2.2 -1.4 6.6 22.4 32.8 41.8 48.5 46.4 37.1 28.1 18.1 3.3 23.5
NORMAL DRY BULB 30 23.6 24.6 34.3 45.9 57.1 65.1 70.2 68.0 61.7 51.1 40.5 29.1 47.6
MEAN DRY BULB 54 24.2 25.5 33.4 46.0 57.1 66.6 71.2 69.4 61.8 51.4 40.5 29.5 48.0
MEAN WET BULB 17 23.6 24.3 30.6 41.0 51.6 60.1 64.3 63.3 56.6 46.4 36.5 27.9 43.9
MEAN DEW POINT 17 18.8 19.1 24.5 34.5 45.8 55.5 60.3 59.8 53.1 41.8 31.8 23.2 39.0
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.1 0.4 1.6 4.3 2.0 0.7 0.0 0.0 0.0 9.1
MAXIMUM 32 30 17.0 14.5 6.1 0.4 0.0 0.0 0.0 0.0 0.0 0.0 1.5 11.5 51.0
MINIMUM 32 30 28.9 25.4 23.0 11.1 1.2 0.0 0.0 0.0 0.1 4.1 15.1 26.0 134.9
MINIMUM 0 30 3.0 2.3 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.9 6.4
H/C NORMAL HEATING DEG. DAYS 30 1283 1131 952 573 270 62 10 33 137 435 735 1113 6734
NORMAL COOLING DEG. DAYS 30 0 0 0 0 25 65 171 126 38 0 0 0 425
RH NORMAL (PERCENT) 30 74 74 71 67 67 69 70 74 77 74 76 78 73
HOUR 01 LST 30 76 78 76 76 78 82 83 87 87 82 80 79 80
HOUR 07 LST 30 77 79 78 77 77 80 82 87 88 84 82 81 81
HOUR 13 LST 30 69 68 62 55 54 55 54 58 60 60 67 72 61
HOUR 19 LST 30 74 73 69 62 60 60 60 67 74 74 76 78 69
S PERCENT POSSIBLE SUNSHINE 57 35 41 49 53 59 66 69 66 59 49 31 31 51
W/O MEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI) 61 0.9 0.6 1.5 1.0 1.1 1.1 0.6 0.8 1.3 1.7 0.8 1.0 12.4
THUNDERSTORMS 61 0.1 0.1 0.9 2.0 3.7 5.2 6.1 5.7 3.1 0.9 0.4 0.2 28.4
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 56 6.6 6.3 5.8 5.4 5.3 4.9 4.6 4.7 4.9 5.3 6.4 6.6 5.6
MIDNIGHT-MIDNIGHT (OKTAS) 32 6.5 6.2 5.7 5.3 5.0 4.7 4.3 4.5 4.7 5.2 6.3 6.5 5.4
MEAN NO. DAYS WITH:
CLEAR 56 2.0 2.4 4.6 6.1 6.0 7.2 7.8 7.7 7.0 6.4 2.1 2.0 61.3
PARTLY CLOUDY 56 6.6 6.7 8.1 7.7 9.7 10.8 12.5 11.7 10.5 8.4 6.1 5.6 104.4
CLOUDY 56 22.4 19.2 18.3 16.3 15.4 12.1 10.7 11.7 12.6 16.3 21.8 23.4 200.2
PR MEAN STATION PRESSURE(IN) 28 29.43 29.45 29.42 29.37 29.38 29.37 29.40 29.44 29.47 29.47 29.45 29.44 29.42
MEAN SEA-LEVEL PRES. (IN) 17 30.06 30.08 30.05 29.99 29.97 29.97 29.98 30.04 30.05 30.08 30.06 30.08 30.03
WINDS MEAN SPEED (MPH) 43 12.0 11.5 11.7 11.3 9.9 9.2 8.5 8.3 8.7 9.2 10.9 11.3 10.2
PREVAIL. DIR (TENS OF DEGS) 27 25 25 25 25 25 24 23 22 21 21 25 25 25
MAXIMUM 2-MINUTE:
SPEED (MPH) 5 45 59 45 41 44 39 52 36 68 38 41 45 68
DIR. (TENS OF DEGS) 24 25 26 25 27 36 20 30 27 26 17 24 27
YEAR OF OCCURRENCE 2000 1997 1998 1997 1998 1998 1999 1999 1998 2001 1999 2000 SEP 1998
MAXIMUM 5-SECOND:
SPEED (MPH) 5 55 75 61 62 63 48 63 53 89 48 52 54 89
DIR. (TENS OF DEGS) 25 24 26 25 28 36 20 31 29 25 17 25 29
YEAR OF OCCURRENCE 2000 1997 1998 1997 1998 1998 1999 1999 1998 2001 1999 2000 SEP 1998
PRECIPITATION NORMAL (IN) 30 2.08 2.10 2.28 2.61 2.72 3.00 2.71 3.40 2.97 2.44 2.92 2.73 31.96
MAXIMUM MONTHLY (IN) 61 5.79 5.07 5.42 4.90 6.62 7.11 9.70 6.00 6.30 7.85 6.99 5.05 9.70
YEAR OF OCCURRENCE 1978 1950 1942 1944 1974 1998 1947 1984 1977 1955 1985 1944 JUL 1947
MINIMUM MONTHLY (IN) 61 0.72 0.66 0.47 1.18 0.36 0.22 0.61 0.76 0.28 0.23 0.44 0.62 0.22
YEAR OF OCCURRENCE 1988 1987 1958 1995 1977 1963 1994 1951 1960 1963 1976 1958 JUN 1963
MAXIMUM IN 24 HOURS (IN) 61 2.24 2.43 2.21 2.22 3.85 2.86 3.25 2.52 3.54 3.13 3.13 1.60 3.85
YEAR OF OCCURRENCE 1998 1950 1942 1991 1974 1950 1987 1998 1979 1995 1945 1978 MAY 1974
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 16.6 15.5 14.0 13.0 11.4 10.8 9.8 10.9 11.1 12.5 15.4 18.1 159.1
PRECIPITATION 1.00 30 0.1 0.2 0.1 0.2 0.3 0.5 0.5 0.8 0.7 0.2 0.3 0.2 4.1
SNOWFALL NORMAL (IN) 30 25.1 22.6 12.3 4.6 0.4 0.0 0.0 0.0 0.0 0.1 6.3 21.6 93.0
MAXIMUM MONTHLY (IN) 61 60.4 64.8 45.0 20.2 10.9 T T T T 2.6 24.9 46.1 64.8
YEAR OF OCCURRENCE 1978 1958 1999 1979 1989 1998 1996 1965 1994 1993 1996 1981 FEB 1958
MAXIMUM IN 24 HOURS (IN) 61 23.0 22.8 23.3 10.4 10.8 T T T T 2.6 14.1 19.1 23.3
YEAR OF OCCURRENCE 1996 1978 1999 1990 1989 1998 1990 1965 1994 1993 1995 1978 MAR 1999
MAXIMUM SNOW DEPTH (IN) 53 32 34 34 10 4 0 0 0 0 1 8 40 40
YEAR OF OCCURRENCE 1978 1966 1999 1975 1989 1957 1972 1959 DEC 1959
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 7.7 7.2 3.6 1.2 0.1 0.0 0.0 0.0 0.0 0.0 2.0 6.9 28.7

2001 Rochester, New York (ROC)

PRECIPITATION (inches) 2001 ROCHESTER, NY (ROC)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 1.50 3.96 2.19 2.68 3.32 6.56 1.43 3.14 3.84 2.25 4.83 2.58 38.28
1973 1.28 1.70 2.92 3.21 2.68 2.84 1.14 1.94 1.41 2.67 3.82 3.62 29.23
1974 1.75 2.06 3.61 2.60 6.62 2.59 2.82 3.64 3.48 1.34 3.23 2.86 36.60
1975 1.83 2.82 2.74 1.43 2.85 5.35 1.18 2.31 3.15 1.83 1.35 3.76 30.60
1976 2.33 1.67 3.54 3.81 2.63 3.37 5.15 3.04 2.13 4.73 0.44 1.48 34.32
1977 1.49 0.97 2.18 2.49 0.36 1.33 3.26 5.65 6.30 2.64 3.78 4.65 35.10
1978 5.79 2.40 1.48 2.25 2.03 1.30 2.17 2.66 3.63 2.56 1.14 4.35 31.76
1979 4.18 2.40 1.76 3.78 3.14 1.85 3.16 2.05 5.32 2.60 1.80 2.86 34.90
1980 1.11 1.16 3.83 2.35 1.49 6.77 1.90 3.44 3.57 3.73 2.52 2.45 34.32
1981 1.24 3.13 1.04 1.95 2.27 2.70 4.60 4.44 5.37 3.29 2.18 2.78 34.99
1982 4.16 1.01 1.73 1.63 1.77 3.92 3.13 3.00 3.57 1.79 3.95 2.17 31.83
1983 1.43 1.23 2.45 3.50 3.44 2.40 1.13 5.43 1.56 3.26 4.91 4.47 35.21
1984 1.62 2.97 2.08 3.05 5.47 1.67 1.90 6.00 3.34 0.76 1.47 3.31 33.64
1985 2.49 1.78 3.47 1.30 2.08 2.63 1.86 1.11 2.49 2.34 6.99 1.46 30.00
1986 1.63 2.46 1.90 3.80 1.64 4.27 3.13 3.29 5.11 3.56 1.93 3.56 36.28
1987 1.89 0.66 1.98 3.68 1.19 3.94 5.85 3.92 4.60 1.65 2.74 1.98 34.08
1988 0.72 2.18 1.62 2.32 1.73 1.10 4.30 3.81 1.69 2.34 1.68 1.11 24.60
1989 1.18 1.55 3.69 1.62 5.99 5.65 0.98 2.46 2.82 3.13 2.01 1.58 32.66
1990 1.61 3.93 1.56 3.58 5.76 2.88 3.05 3.59 3.36 4.37 2.27 4.18 40.14
1991 1.69 1.16 4.70 4.07 2.43 1.19 2.37 1.80 2.86 1.65 2.39 2.92 29.23
1992 1.46 1.87 3.53 3.43 2.83 1.98 6.03 4.45 3.02 1.78 2.90 2.98 36.26
1993 2.32 1.52 2.44 3.07 1.24 2.76 1.67 1.67 4.37 3.21 3.27 1.60 29.14
1994 2.68 1.63 1.70 4.08 2.56 2.43 0.61 4.27 2.68 1.34 3.24 2.32 29.54
1995 2.46 1.58 1.15 1.18 1.75 2.07 3.85 3.05 1.50 5.70 4.21 1.50 30.00
1996 3.18 1.72 2.07 4.84 3.51 6.65 2.18 3.33 5.09 5.40 4.12 2.97 45.06
1997 2.03 2.40 3.88 1.33 2.12 3.01 1.94 4.22 5.36 1.94 3.57 2.88 34.68
1998 5.63 2.34 3.50 1.81 2.63 7.11 6.09 5.39 3.00 1.45 1.41 1.60 41.96
1999 3.92 0.69 3.28 2.07 2.72 2.52 1.78 5.71 3.41 2.12 2.86 2.06 33.14
2000 2.98 1.97 2.04 4.35 4.70 4.47 3.66 4.11 3.53 1.36 2.19 2.47 37.83
2001 1.95 2.26 4.13 1.19 2.66 1.84 1.80 4.30 3.15 2.28 1.90 1.72 29.18
POR=173 YRS 2.49 2.33 2.63 2.63 2.91 3.03 3.01 2.96 2.75 2.71 2.71 2.49 32.65

2001 Rochester, New York (ROC)

AVERAGE TEMPERATURE (F) 2001 ROCHESTER, NY (ROC)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 26.0 23.4 30.3 42.2 60.4 65.2 73.0 69.8 64.3 47.6 37.0 33.1 47.7
1973 28.7 22.2 42.5 48.0 56.1 70.7 73.4 73.0 62.5 55.0 43.0 31.2 50.5
1974 27.1 22.5 33.0 49.4 53.9 65.7 71.3 70.6 59.2 47.6 39.5 31.4 47.6
1975 29.5 28.4 31.6 39.3 63.2 67.1 73.0 70.0 58.4 53.1 47.2 27.8 49.1
1976 19.8 33.3 37.2 48.6 55.4 69.8 69.2 68.4 60.9 47.5 35.4 23.6 47.4
1977 15.5 25.4 39.8 47.9 60.7 64.8 72.9 68.7 62.7 49.4 43.6 28.4 48.3
1978 22.9 16.2 29.7 43.6 60.2 67.4 72.6 71.6 62.4 51.0 41.0 30.0 47.4
1979 21.5 13.7 38.6 44.0 56.4 66.2 72.3 67.1 61.3 50.3 43.0 32.3 47.2
1980 24.0 19.7 32.4 47.8 60.0 63.1 72.9 74.3 63.7 48.8 38.8 24.7 47.5
1981 15.7 32.3 34.5 48.0 57.2 67.3 71.9 69.4 59.8 47.3 39.9 28.7 47.7
1982 16.1 23.0 33.5 43.2 60.9 63.6 72.0 66.1 62.8 52.7 43.4 37.4 47.9
1983 27.4 29.1 37.2 43.9 53.8 66.7 73.8 70.7 63.9 52.9 40.7 25.1 48.8
1984 20.4 33.2 26.5 47.5 52.6 66.8 69.2 72.0 60.6 54.9 40.7 35.9 48.4
1985 21.9 25.6 36.7 49.6 58.6 61.7 68.8 68.7 63.8 51.0 41.4 25.0 47.7
1986 25.0 24.5 37.0 47.9 59.8 63.3 69.8 65.7 59.8 49.9 36.9 31.7 47.6
1987 25.3 23.6 37.1 49.7 59.9 67.9 72.7 67.3 61.6 47.1 40.6 32.6 48.8
1988 25.0 23.7 34.7 45.0 58.7 64.2 73.7 71.1 60.1 45.8 42.6 29.4 47.8
1989 30.3 22.5 32.3 42.1 56.3 67.4 72.8 68.5 61.7 52.6 38.1 17.1 46.8
1990 33.6 29.3 37.3 48.8 54.4 67.2 70.7 69.9 60.7 52.1 42.4 33.8 50.0
1991 25.1 30.5 37.0 50.0 62.8 68.3 72.3 70.3 60.5 52.1 39.0 30.7 49.9
1992 26.2 27.2 30.2 44.1 57.1 63.5 66.6 66.3 60.9 46.4 38.9 30.2 46.5
1993 27.5 18.7 30.0 46.9 56.6 65.5 72.4 71.4 59.0 48.0 39.0 28.4 47.0
1994 14.9 21.1 32.0 48.0 54.2 67.8 73.5 69.2 62.4 52.4 45.8 34.8 48.0
1995 32.1 23.8 38.5 41.6 57.2 69.5 73.0 73.3 60.4 55.2 35.2 25.3 48.8
1996 23.7 24.6 29.7 43.3 54.6 68.0 68.1 69.3 62.0 51.2 34.3 33.6 46.9
1997 24.3 30.5 32.9 43.8 50.4 67.1 67.8 66.3 59.3 49.1 37.4 31.2 46.7
1998 31.6 32.6 38.1 47.7 62.9 65.7 69.6 69.8 62.7 51.2 41.8 34.6 50.7
1999 22.9 30.6 30.8 45.3 59.6 68.3 74.3 67.1 64.0 50.9 44.9 32.2 49.2
2000 23.2 30.2 41.2 45.1 59.5 65.8 67.1 67.5 60.9 51.7 38.4 22.6 47.8
2001 26.6 28.6 30.3 47.7 59.5 66.7 69.0 72.2 61.2 52.4 47.1 35.9 49.8
POR=130 YRS 24.7 24.8 33.0 45.1 56.9 66.4 71.3 69.3 62.5 51.3 39.9 29.1 47.9

REFERENCE NOTES:

PAGE 1:

THE TEMPERATURE GRAPH SHOWS NORMAL MAXIMUM AND NORMAL MINIMUM DAILY TEMPERATURES (SOLID CURVES) AND THE ACTUAL DAILY HIGH AND LOW TEMPERATURES (VERTICAL BARS).

PAGE 2 AND 3:

H/C INDICATES HEATING AND COOLING DEGREE DAYS.

RH INDICATES RELATIVE HUMIDITY

W/O INDICATES WEATHER AND OBSTRUCTIONS

S INDICATES SUNSHINE.

PR INDICATES PRESSURE.

CLOUDINESS ON PAGE 3 IS THE SUM OF THE CEILOMETER AND SATELLITE DATA NOT TO EXCEED EIGHT EIGHTHS (OKTAS).

GENERAL:

T INDICATES TRACE PRECIPITATION, AN AMOUNT GREATER THAN ZERO BUT LESS THAN THE LOWEST REPORTABLE VALUE.

+ INDICATES THE VALUE ALSO OCCURS ON EARLIER DATES.

BLANK ENTRIES DENOTE MISSING OR UNREPORTED DATA.

NORMALS ARE 30–YEAR AVERAGES (1961–1990).

ASOS INDICATES AUTOMATED SURFACE OBSERVING SYSTEM.

PM INDICATES THE LAST DAY OF THE PREVIOUS MONTH.

POR (PERIOD OF RECORD) BEGINS WITH THE JANUARY DATA MONTH AND IS THE NUMBER OF YEARS USED TO COMPUTE THE MEAN. INDIVIDUAL MONTHS WITHIN THE POR MAY BE MISSING.

WHEN THE POR FOR A NORMAL IS LESS THAN 30 YEARS, THE NORMAL IS PROVISIONAL AND IS BASED ON THE NUMBER OF YEARS INDICATED.

0.* OR * INDICATES THE VALUE OR MEAN–DAYS–WITH IS BETWEEN 0.00 AND 0.05.

CLOUDINESS FOR ASOS STATIONS DIFFERS FROM THE NON–ASOS OBSERVATION TAKEN BY A HUMAN OBSERVER. ASOS STATION CLOUDINESS IS BASED ON TIME–AVERAGED CEILOMETER DATA FOR CLOUDS AT OR BELOW 12,000 FEET AND ON SATELLITE DATA FOR CLOUDS ABOVE 12,000 FEET.

THE NUMBER OF DAYS WITH CLEAR, PARTLY CLOUDY, AND CLOUDY CONDITIONS FOR ASOS STATIONS IS THE SUM OF THE CEILOMETER AND SATELLITE DATA FOR THE SUNRISE TO SUNSET PERIOD.

GENERAL CONTINUED:

CLEAR INDICATES 0–2 OKTAS, PARTLY CLOUDY INDICATES 3–6 OKTAS, AND CLOUDY INDICATES 7 OR 8 OKTAS. WHEN AT LEAST ONE OF THE ELEMENTS (CEILOMETER OR SATELLITE) IS MISSING, THE DAILY CLOUDINESS IS NOT COMPUTED.

WIND DIRECTION IS RECORDED IN TENS OF DEGREES (2 DIGITS) CLOCKWISE FROM TRUE NORTH. "00" INDICATES CALM. "36" INDICATES TRUE NORTH.

RESULTANT WIND IS THE VECTOR AVERAGE OF THE SPEED AND DIRECTION.

AVERAGE TEMPERATURE IS THE SUM OF THE MEAN DAILY MAXIMUM AND MINIMUM TEMPERATURE DIVIDED BY 2.

SNOWFALL DATA COMPRISE ALL FORMS OF FROZEN PRECIPITATION, INCLUDING HAIL.

A HEATING (COOLING) DEGREE DAY IS THE DIFFERENCE BETWEEN THE AVERAGE DAILY TEMPERATURE AND 65 F.

DRY BULB IS THE TEMPERATURE OF THE AMBIENT AIR.

DEW POINT IS THE TEMPERATURE TO WHICH THE AIR MUST BE COOLED TO ACHIEVE 100 PERCENT RELATIVE HUMIDITY.

WET BULB IS THE TEMPERATURE THE AIR WOULD HAVE IF THE MOISTURE CONTENT WAS INCREASED TO 100 PERCENT RELATIVE HUMIDITY.

ON JULY 1, 1996, THE NATIONAL WEATHER SERVICE BEGAN USING THE "METAR" OBSERVATION CODE THAT WAS ALREADY EMPLOYED BY MOST OTHER NATIONS OF THE WORLD. THE MOST NOTICEABLE DIFFERENCE IN THIS ANNUAL PUBLICATION WILL BE THE CHANGE IN UNITS FROM TENTHS TO EIGHTS (OKTAS) FOR REPORTING THE AMOUNT OF SKY COVER.

2001 Rochester, New York (ROC)

HEATING DEGREE DAYS (base 65 F) 2001 ROCHESTER, NY (ROC)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 7 24 92 534 833 982 1118 1189 690 519 279 17 6284
1973-74 2 14 162 305 653 1040 1167 1187 983 475 352 59 6399
1974-75 1 1 209 535 755 1034 1096 1017 1031 764 139 52 6634
1975-76 4 14 194 365 525 1146 1395 914 858 507 300 35 6257
1976-77 11 27 173 538 879 1279 1524 1103 777 523 204 89 7127
1977-78 9 44 113 477 634 1127 1298 1360 1087 634 220 63 7066
1978-79 5 1 136 428 711 1077 1342 1432 813 626 310 79 6960
1979-80 13 37 155 468 655 1006 1264 1306 1003 510 195 125 6737
1980-81 1 0 108 498 782 1243 1522 908 938 507 260 26 6793
1981-82 6 12 201 546 748 1119 1510 1171 972 648 162 67 7162
1982-83 10 54 113 377 643 847 1161 998 854 627 347 78 6109
1983-84 9 8 121 387 723 1228 1376 917 1187 520 395 50 6921
1984-85 14 7 162 307 724 897 1330 1097 869 471 217 119 6214
1985-86 15 23 121 429 700 1231 1235 1129 864 506 206 100 6559
1986-87 16 62 175 462 840 1026 1223 1153 858 454 234 39 6542
1987-88 7 50 139 547 722 997 1232 1192 933 594 220 126 6759
1988-89 6 40 164 596 664 1095 1070 1184 1009 682 288 33 6831
1989-90 0 33 149 383 801 1478 967 993 853 520 327 46 6550
1990-91 7 6 171 406 669 959 1230 957 862 458 170 29 5924
1991-92 2 1 196 408 776 1057 1195 1088 1069 621 259 89 6761
1992-93 26 46 172 571 774 1071 1158 1289 1077 538 263 66 7051
1993-94 0 10 214 525 775 1127 1550 1221 1015 505 345 56 7343
1994-95 1 16 106 386 568 928 1015 1147 811 694 239 33 5944
1995-96 13 7 162 300 885 1224 1271 1163 1086 647 347 16 7121
1996-97 19 6 140 421 915 968 1255 960 989 628 448 45 6794
1997-98 32 29 181 492 822 1041 1029 901 837 513 109 99 6085
1998-99 4 14 115 424 690 935 1295 955 1054 583 194 57 6320
1999-00 2 25 100 431 595 1008 1289 1003 732 591 211 75 6062
2000-01 23 35 178 404 793 1308 1186 1014 1067 522 192 63 6785
2001- 24 3 152 391 529 896

2001 Rochester, New York (ROC)

COOLING DEGREE DAYS (base 65 F) 2001 ROCHESTER, NY (ROC)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 0 0 24 94 261 179 79 0 0 0 637
1973 0 0 0 15 6 194 267 269 96 4 0 0 851
1974 0 0 0 13 14 88 204 181 40 0 0 0 540
1975 0 0 0 0 89 121 257 178 5 6 0 0 656
1976 0 0 0 24 9 189 150 138 55 1 0 0 566
1977 0 0 3 16 80 88 260 164 50 0 1 0 662
1978 0 0 0 0 77 141 245 212 66 3 0 0 744
1979 0 0 0 1 52 121 244 112 49 18 0 0 597
1980 0 0 0 0 46 73 253 294 76 2 0 0 744
1981 0 0 0 5 23 102 228 156 50 0 0 0 564
1982 0 0 0 3 40 30 232 95 52 3 1 0 456
1983 0 0 0 0 7 136 289 192 96 20 0 0 740
1984 0 0 0 1 14 113 152 233 35 1 0 0 549
1985 0 0 0 15 23 27 139 145 90 0 0 0 439
1986 0 0 1 0 50 53 168 94 28 0 0 0 394
1987 0 0 0 1 82 131 254 127 42 0 0 0 637
1988 0 0 0 0 34 107 284 232 29 7 0 0 693
1989 0 0 0 0 26 111 248 153 60 3 0 0 601
1990 0 0 3 41 5 122 192 164 45 14 0 0 586
1991 0 0 0 14 108 135 234 175 68 14 0 0 748
1992 0 0 0 1 19 51 84 96 57 0 0 0 308
1993 0 0 0 0 9 86 239 214 42 5 0 0 595
1994 0 0 0 0 16 145 271 152 36 2 1 0 623
1995 0 0 0 0 3 175 266 269 33 5 0 0 751
1996 0 0 0 1 31 115 120 147 58 0 0 0 472
1997 0 0 0 1 0 114 126 75 15 8 0 0 339
1998 0 0 9 0 48 125 152 168 53 4 0 0 559
1999 0 0 0 0 38 161 296 93 77 0 0 0 665
2000 0 0 0 2 49 105 95 120 63 0 0 0 434
2001 0 0 0 9 28 119 154 233 44 6 0 0 593

2001 Rochester, New York (ROC)

SNOWFALL (inches) 2001 ROCHESTER, NY (ROC)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 0.2 16.9 22.7 8.9 18.4 4.4 1.5 T 0.0 73.0
1973-74 0.0 0.0 0.0 0.0 4.2 23.4 14.4 26.6 22.3 8.2 T 0.0 99.1
1974-75 0.0 0.0 0.0 0.3 4.6 26.5 10.8 23.2 10.9 14.9 0.0 0.0 91.2
1975-76 0.0 0.0 0.0 T 1.8 28.3 29.9 8.8 15.2 1.8 0.4 0.0 86.2
1976-77 0.0 0.0 0.0 0.5 6.5 24.5 30.2 15.0 13.0 1.8 0.6 0.0 92.1
1977-78 0.0 0.0 0.0 T 12.7 35.2 60.4 40.7 7.5 4.2 0.2 0.0 160.9
1978-79 0.0 0.0 0.0 T 3.3 30.9 36.8 39.1 8.2 20.2 0.0 0.0 138.5
1979-80 0.0 0.0 0.0 0.2 1.2 12.2 13.1 24.0 21.2 0.3 0.0 0.0 72.2
1980-81 0.0 0.0 0.0 T 8.4 31.8 31.5 9.3 12.0 1.4 0.0 0.0 94.4
1981-82 0.0 0.0 0.0 0.1 2.4 46.1 43.6 14.9 8.9 12.4 0.0 0.0 128.4
1982-83 0.0 0.0 0.0 T 3.0 11.6 10.2 13.6 9.3 12.2 T 0.0 59.9
1983-84 0.0 0.0 0.0 0.0 17.6 19.6 23.4 27.8 29.1 0.5 T 0.0 118.0
1984-85 0.0 0.0 0.0 0.0 1.6 11.6 36.8 26.1 8.4 2.6 0.0 0.0 87.1
1985-86 0.0 0.0 0.0 0.0 7.6 18.3 15.5 17.9 9.3 2.1 T 0.0 70.7
1986-87 0.0 0.0 0.0 0.0 7.4 9.3 29.6 13.0 5.3 2.5 0.0 0.0 67.1
1987-88 0.0 0.0 0.0 T 4.6 19.3 9.8 29.4 5.6 1.1 0.0 0.0 69.8
1988-89 0.0 0.0 0.0 0.1 0.2 10.3 15.0 30.6 15.6 3.9 10.9 0.0 86.6
1989-90 0.0 0.0 0.0 T 6.5 32.8 14.0 31.3 5.4 15.8 T 0.0 105.8
1990-91 T 0.0 0.0 T 4.4 18.2 26.5 16.1 2.0 1.1 0.0 0.0 68.3
1991-92 0.0 0.0 0.0 0.0 13.7 23.9 18.3 12.8 38.1 3.8 0.0 0.0 110.6
1992-93 0.0 0.0 0.0 T 9.5 29.3 22.4 31.2 37.1 2.0 T 0.0 131.5
1993-94 0.0 0.0 T 2.6 9.8 14.0 43.0 35.1 12.1 9.6 0.0 0.0 126.2
1994-95 0.0 0.0 T 0.0 2.8 7.6 12.8 23.6 5.3 4.1 0.0 0.0 56.2
1995-96 0.0 0.0 0.0 T 23.4 20.5 36.9 14.1 28.6 5.3 1.5 0.0 130.3
1996-97 T 0.0 0.0 0.0 24.9 14.0 24.8 13.3 26.4 1.3 T 0.0 104.7
1997-98 0.0 0.0 0.0 0.1 21.6 26.4 14.6 9.1 27.9 0.0 0.0 T 99.7
1998-99 0.0 0.0 T 0.0 0.1 10.1 48.8 4.7 45.0 2.9 0.0 0.0 111.6
1999-00 0.0 0.0 0.0 0.0 4.7 19.1 42.0 25.7 13.6 5.6 0.0 0.0 110.7
2000-01 0.0 0.0 0.0 T 7.3 39.3 21.6 23.3 41.4 0.1 0.0 0.0 133.0
2001- 0.0 0.0 0.0 T 0.1 7.1
POR=60 YRS T T T 0.2 7.0 19.4 23.3 21.5 15.4 3.4 0.7 0.0 90.9



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