2001 NEW ORLEANS, LOUISIANA (MSY)



The New Orleans metropolitan area is virtually surrounded by water. Lake Pontchartrain, some 610 square miles in area, borders the city on the north and is connected to the Gulf of Mexico through Lake Borgne on the east. In other directions there are bayous, lakes, and marshy delta land. The proximity of the Gulf of Mexico also has a great influence on the climate. Elevations in the city vary from a few feet below to a few feet above mean sea level. A massive levee system surrounding the city and along the Mississippi River offers protection against flooding from the river and tidal surges. The New Orleans International Airport is located 12 miles west of downtown New Orleans, between the Mississippi River and Lake Pontchartrain.

The climate of the city can best be described as humid with the surrounding water modifying the temperature and decreasing the range between the extremes. Almost daily sporadic afternoon thunderstorms from mid–June through September keep the temperature from rising much above 90 degrees. From about mid–November to mid–March, the area is subjected alternately to the southerly flow of warm tropical air and to the northerly flow of cold continental air in periods of varying lengths. The usual track of winter storms is to the north of New Orleans, but occasionally one moves this far south, bringing large and rather sudden drops in temperature. However, the cold spells seldom last over three or four days. The lowest temperatures observed are below 10 degrees. In about two–thirds of the years, the lowest temperature is about 24 degrees or warmer. The lowest temperatures in some years are entirely above freezing.

During the winter and spring, the cold Mississippi River water enhances the formation of river fogs, particularly when light southerly winds bring warm, moist air into the area from the Gulf of Mexico. The nearby lakes and marshes also contribute to fog formation. Even so, the fog usually does not seriously affect automobile traffic except for brief periods. However, air travel will be suspended for several hours and river traffic, at times, will be unable to move between New Orleans and the Gulf for several days.

Rather frequent and sometimes very heavy rains are typical for this area. There are an average of 120 days of measurable rain per year and an annual average accumulation of over 60 inches. A fairly definite rainy period occurs from mid–December to mid–March. Precipitation during this period is most likely to be steady rain for two to three day periods. April, May, October, and November are generally dry, but there have been some extremely heavy showers in those months. The greatest 24–hour amounts have exceeded 14 inches. Snowfall is rather infrequent and light. However, on rare occasions, snowstorms have produced accumulations over 8 inches.

While thunder occurs with most of the showers in the area, thunderstorms with damaging winds are infrequent. Hail of a damaging nature seldom occurs, and tornadoes are extremely rare. However, waterspouts are observed quite often on nearby lakes. Hurricanes have effected the area.

The lower Mississippi River floods result from runoff upstream. If the water level in the river becomes dangerously high, the spillways upriver can be opened to divert the floodwaters. Rainfall in the New Orleans area is pumped into the surrounding lakes and bayous. Local street and minor urban flooding of short duration result from occasional downpours.

Air pollution is not a serious problem. The area is not highly industrialized, and long periods of air stagnation are rare.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is December 5 and the average last occurrence in the spring is February 20.

NORMALS, MEANS, AND EXTREMES

NEW ORLEANS, LA (MSY)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 12916

29 59′ 34″ N  90 15′ 03″ W  GRND: 4  BARO: 7  CENTRAL (UTC + 6)

2001 New Orleans, Louisiana (MSY)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 60.8 64.1 71.6 78.5 84.4 89.2 90.6 90.2 86.6 79.4 71.1 64.3 77.6
MEAN DAILY MAXIMUM 54 62.0 65.3 71.2 78.3 84.9 89.4 90.9 90.6 86.9 79.6 70.7 64.4 77.8
HIGHEST DAILY MAXIMUM 55 83 85 89 92 96 100 101 102 101 94 87 84 102
YEAR OF OCCURRENCE 1982 1972 1982 1987 1953 1954 1981 1980 1980 1998 1997 1995 AUG 1980
MEAN OF EXTREME MAXS. 54 77.4 79.4 82.5 86.5 91.4 94.6 95.8 95.6 93.2 88.6 83.2 79.9 87.3
NORMAL DAILY MINIMUM 30 41.8 44.4 51.6 58.4 65.2 70.8 73.1 72.8 69.5 58.7 51.0 44.8 58.5
MEAN DAILY MINIMUM 54 43.6 46.2 51.9 58.7 65.8 71.3 73.5 73.4 70.0 59.9 50.8 45.5 59.2
LOWEST DAILY MINIMUM 55 14 16 25 32 41 50 60 60 42 35 24 11 11
YEAR OF OCCURRENCE 1985 1996 1980 1971 1960 1984 1967 1968 1967 1993 1970 1989 DEC 1989
MEAN OF EXTREME MINS. 54 26.4 29.9 35.8 43.6 54.1 63.6 69.2 68.4 59.7 44.3 34.8 28.4 46.5
NORMAL DRY BULB 30 51.3 54.3 61.6 68.5 74.8 80.0 81.9 81.5 78.1 69.1 61.1 54.5 68.1
MEAN DRY BULB 54 52.8 55.7 61.7 68.5 75.4 80.4 82.2 82.0 78.5 69.7 60.8 55.0 68.6
MEAN WET BULB 17 48.7 52.5 56.8 62.5 69.9 74.5 76.0 76.0 72.6 64.3 57.4 48.6 63.3
MEAN DEW POINT 17 44.2 47.9 52.3 58.2 66.4 72.0 73.7 73.7 69.6 60.4 53.3 44.7 59.7
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.2 3.1 14.4 20.4 19.8 8.9 0.9 0.0 0.0 67.7
MAXIMUM 32 30 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.4
MINIMUM 32 30 6.2 3.5 0.6 * 0.0 0.0 0.0 0.0 0.0 0.0 0.8 4.7 15.8
MINIMUM 0 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
H/C NORMAL HEATING DEG. DAYS 30 450 316 162 28 0 0 0 0 0 30 178 349 1513
NORMAL COOLING DEG. DAYS 30 25 17 56 133 304 450 524 512 393 157 61 23 2655
RH NORMAL (PERCENT) 30 76 73 73 73 74 76 79 79 78 75 77 77 76
HOUR 00 LST 30 81 80 81 84 85 87 88 88 86 84 85 83 84
HOUR 06 LST 30 84 83 85 88 89 90 92 92 89 88 87 86 88
HOUR 12 LST 30 66 63 61 59 60 64 66 67 65 59 63 66 63
HOUR 18 LST 30 71 66 64 64 65 68 72 73 74 72 76 74 70
S PERCENT POSSIBLE SUNSHINE 22 46 50 56 62 62 63 59 61 61 64 54 48 57
W/O MEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI) 53 5.7 4.2 3.5 1.6 0.9 0.2 0.1 0.2 0.3 1.6 3.5 4.5 26.3
THUNDERSTORMS 53 2.2 2.9 4.0 4.2 5.8 9.8 14.7 12.4 6.6 1.9 2.0 2.1 68.6
CLOUDINESS MEAN:
SUNRISE–SUNSET (OKTAS) 48 5.4 5.0 5.0 4.6 4.9 4.9 5.1 4.6 4.3 3.6 4.3 5.1 4.7
MIDNIGHT–MIDNIGHT (OKTAS) 32 5.2 4.8 4.9 4.4 4.2 4.0 4.6 4.3 4.0 3.3 4.0 4.8 4.4
MEAN NO. DAYS WITH:
CLEAR 48 6.9 7.5 7.8 7.9 8.9 8.3 4.6 7.2 9.6 14.3 10.2 7.7 100.9
PARTLY CLOUDY 48 7.1 6.4 8.0 10.4 11.2 12.5 14.6 13.8 10.6 7.9 8.2 7.4 118.1
CLOUDY 48 16.9 14.3 15.2 11.7 10.9 9.2 11.8 10.0 9.8 8.9 11.5 15.9 146.1
PR MEAN STATION PRESSURE(IN) 28 30.11 30.08 30.00 29.98 29.94 29.96 30.00 29.98 29.96 30.03 30.08 30.11 30.02
MEAN SEA–LEVEL PRES. (IN) 17 30.15 30.11 30.05 30.01 29.98 30.01 30.04 30.00 29.99 30.06 30.11 30.16 30.06
WINDS MEAN SPEED (MPH) 39 9.4 9.9 9.9 9.5 8.1 6.9 6.2 6.1 7.5 7.8 8.8 9.2 8.3
PREVAIL. DIR (TENS OF DEGS) 23 36 36 16 16 18 18 23 05 04 05 06 36 18
MAXIMUM 2–MINUTE:
SPEED (MPH) 5 48 43 36 40 33 36 39 40 46 32 36 39 48
DIR. (TENS OF DEGS) 27 21 25 01 28 28 24 02 02 03 26 24 27
YEAR OF OCCURRENCE 1998 1998 2001 1997 2001 2001 1998 1997 1998 2000 2001 2000 JAN 1998
MAXIMUM 5–SECOND:
SPEED (MPH) 5 63 51 44 53 44 48 47 48 55 38 44 51 63
DIR. (TENS OF DEGS) 33 21 10 21 26 25 24 04 01 02 26 24 33
YEAR OF OCCURRENCE 1998 1998 2001 1997 1999 2001 1998 1997 1998 2000 2001 2001 JAN 1998
PRECIPITATION NORMAL (IN) 30 5.05 6.01 4.90 4.50 4.56 5.84 6.12 6.17 5.51 3.05 4.42 5.75 61.88
MAXIMUM MONTHLY (IN) 55 19.28 12.59 19.09 16.12 21.18 17.62 13.15 16.12 18.98 13.20 19.81 10.77 21.18
YEAR OF OCCURRENCE 1998 1983 1948 1980 1995 2001 1991 1977 1998 1985 1989 1967 MAY 1995
MINIMUM MONTHLY (IN) 55 0.54 0.15 0.24 0.28 0.07 0.23 1.38 1.68 0.24 0.00 0.21 1.46 0.00
YEAR OF OCCURRENCE 1968 1989 1955 1976 2000 1979 2000 1980 1953 1978 1949 1958 OCT 1978
MAXIMUM IN 24 HOURS (IN) 55 6.08 5.60 7.87 8.08 12.40 7.40 4.43 4.96 6.50 4.51 12.66 6.81 12.66
YEAR OF OCCURRENCE 1978 1961 1948 1988 1995 1988 1996 1992 1971 1985 1989 1990 NOV 1989
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 10.3 8.9 8.8 6.7 7.6 10.9 14.3 13.5 10.0 5.5 7.9 9.9 114.3
PRECIPITATION 1.00 30 1.5 2.0 1.7 1.2 1.5 2.0 1.7 1.6 1.9 1.0 1.5 1.8 19.4
SNOWFALL NORMAL (IN) 30 0.* 0.* T 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1
MAXIMUM MONTHLY (IN) 51 0.4 2.0 T T T 0.0 0.0 0.0 0.0 0.0 T 2.7 2.7
YEAR OF OCCURRENCE 1985 1958 1993 1996 1989 1950 1963 DEC 1963
MAXIMUM IN 24 HOURS (IN) 50 0.4 2.0 T T T 0.0 0.0 0.0 0.0 0.0 T 2.7 2.7
YEAR OF OCCURRENCE 1985 1958 1993 1996 1989 1950 1963 DEC 1963
MAXIMUM SNOW DEPTH (IN) 48 2 2 0 0 0 0 0 0 0 0 0 1 2
YEAR OF OCCURRENCE 1964 1958 1989 FEB 1958
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.* 0.0

2001 New Orleans, Louisiana (MSY)

PRECIPITATION (inches) 2001 NEW ORLEANS, LA (MSY)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 6.98 6.03 6.07 1.64 6.31 3.10 3.90 4.92 3.29 4.64 8.45 8.65 63.98
1973 2.68 5.40 12.17 10.47 4.68 6.08 5.94 3.37 11.07 5.07 4.04 8.31 79.28
1974 8.46 5.53 6.64 5.52 9.84 3.83 5.66 6.70 7.58 2.26 5.88 4.89 72.79
1975 2.95 3.64 5.32 6.69 8.03 12.28 8.35 10.11 3.97 4.00 11.35 3.81 80.50
1976 2.61 3.85 3.08 0.28 5.58 3.36 5.67 1.69 1.57 5.08 5.80 8.81 47.38
1977 5.62 2.75 3.96 6.38 2.59 1.74 2.91 16.12 13.48 4.33 8.77 4.15 72.80
1978 13.63 2.53 2.67 3.44 9.72 7.82 10.34 14.68 2.98 0.00 4.67 4.42 76.90
1979 5.55 12.49 3.31 4.90 4.38 0.23 11.43 4.57 4.55 1.49 4.27 3.07 60.24
1980 6.37 3.09 10.08 16.12 9.65 3.69 4.84 1.68 6.31 5.87 3.85 1.54 73.09
1981 0.94 8.34 2.70 2.28 5.35 8.47 1.92 11.10 4.78 2.03 1.10 5.50 54.51
1982 2.76 7.88 2.56 5.86 1.19 5.43 13.07 1.92 5.40 3.84 5.45 10.26 65.62
1983 3.31 12.59 4.88 14.86 3.71 10.64 2.95 6.29 5.72 4.88 6.32 9.15 85.30
1984 4.10 5.27 4.90 1.72 3.54 7.21 3.86 9.51 3.79 2.84 2.80 2.53 52.07
1985 4.83 9.28 7.07 2.11 1.16 4.56 6.92 6.37 5.74 13.20 0.96 4.78 66.98
1986 3.49 2.93 1.88 1.50 1.61 8.87 3.60 6.74 1.42 2.87 7.90 5.05 47.86
1987 8.88 7.38 4.39 2.27 3.46 15.01 6.38 5.05 1.29 0.72 2.92 2.88 60.63
1988 3.74 11.31 8.90 9.25 1.68 11.28 6.78 7.53 5.86 2.87 1.26 3.94 74.40
1989 2.47 0.15 7.14 3.20 3.50 8.22 8.34 3.31 4.53 0.51 19.81 6.28 67.46
1990 7.59 11.45 5.98 4.59 5.87 1.01 2.30 2.45 4.55 2.38 3.21 9.67 61.05
1991 19.25 5.42 6.27 15.29 14.28 10.71 13.15 7.86 3.44 1.88 2.19 2.63 102.37
1992 9.94 8.73 6.69 2.52 0.95 9.52 5.75 9.64 6.63 0.55 15.27 5.68 81.87
1993 6.21 2.34 5.65 6.82 7.23 4.96 5.77 2.26 2.47 3.67 2.43 2.90 52.71
1994 3.25 0.54 4.82 2.83 3.67 9.35 8.95 4.59 5.61 2.30 1.39 4.61 51.91
1995 3.66 4.94 7.89 3.81 21.18 2.84 6.44 3.26 0.69 1.31 4.24 5.07 65.33
1996 4.66 1.56 2.97 3.87 1.37 8.60 10.32 8.76 3.96 2.59 3.10 5.55 57.31
1997 6.32 6.88 2.57 4.91 5.03 6.97 3.94 2.25 0.81 1.36 8.09 2.55 51.68
1998 19.28 4.28 5.97 4.39 0.43 3.38 6.56 8.30 18.98 1.82 3.40 2.25 79.04
1999 3.20 0.92 4.60 0.30 3.37 12.20 4.05 5.21 2.87 5.46 0.28 3.85 46.31
2000 2.25 1.81 2.41 1.13 0.07 5.46 1.38 2.35 6.50 1.10 11.72 2.70 38.88
2001 3.05 1.59 8.07 1.08 6.85 17.62 6.97 7.41 6.30 5.13 2.54 2.90 69.51
POR=72 YRS 5.12 4.92 5.26 4.64 4.84 5.66 6.61 5.89 5.33 3.01 4.45 4.86 60.59

2001 New Orleans, Louisiana (MSY)

AVERAGE TEMPERATURE (F) 2001 NEW ORLEANS, LA (MSY)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 58.6 56.1 61.9 69.8 73.9 80.8 79.4 81.1 79.6 70.4 56.6 55.3 68.6
1973 50.3 52.6 65.5 64.2 72.5 81.7 84.4 81.7 79.7 73.4 66.6 54.1 68.9
1974 63.3 55.9 67.3 69.0 75.8 78.1 80.3 80.4 77.0 66.9 59.8 55.3 69.1
1975 57.2 58.9 61.4 66.8 75.1 79.4 80.2 80.5 75.1 69.9 61.2 51.9 68.1
1976 50.6 58.2 64.8 68.5 72.3 78.3 81.2 81.5 77.8 64.0 52.7 50.6 66.7
1977 43.4 53.8 65.0 69.0 75.9 82.4 83.9 81.9 80.2 68.2 62.9 54.3 68.4
1978 44.1 45.0 59.9 71.4 76.9 81.2 82.6 83.2 81.1 69.7 67.1 55.9 68.2
1979 45.9 52.9 62.6 71.1 74.6 81.1 83.6 82.9 79.3 71.0 58.0 52.5 68.0
1980 56.1 52.0 62.0 66.2 77.9 83.3 85.8 85.5 83.5 68.8 60.0 53.6 69.6
1981 48.5 55.3 61.9 71.4 74.8 83.8 85.0 83.1 77.9 71.1 64.9 54.5 69.4
1982 54.5 55.0 65.9 69.8 76.5 81.5 81.4 82.2 76.8 70.4 62.5 59.4 69.7
1983 50.2 53.8 58.3 64.3 74.0 77.6 81.5 82.4 75.3 69.1 60.0 49.5 66.3
1984 46.6 53.9 59.3 67.5 73.7 77.4 78.8 79.2 76.3 73.5 58.8 62.4 67.3
1985 45.2 52.3 65.3 69.0 74.7 79.3 80.2 81.6 77.0 72.6 67.3 51.0 68.0
1986 51.2 59.2 60.6 67.2 76.7 81.0 83.2 81.6 81.0 70.4 66.3 53.2 69.3
1987 50.0 56.3 60.3 66.2 76.8 79.9 82.9 83.5 78.2 64.4 61.6 59.0 68.3
1988 49.4 53.2 60.9 68.4 73.3 78.5 81.6 81.4 79.8 68.0 65.6 56.0 68.0
1989 60.2 55.9 62.8 67.0 76.4 79.4 81.4 81.7 76.9 67.5 62.4 46.9 68.2
1990 57.2 61.3 63.3 67.6 76.2 82.6 82.3 83.0 79.6 68.1 62.3 59.0 70.2
1991 52.8 58.2 64.2 71.2 77.5 81.3 83.5 81.7 78.2 71.6 55.9 57.6 69.5
1992 51.1 58.3 62.0 66.4 72.8 80.6 83.1 79.6 78.5 69.5 57.4 58.2 68.1
1993 57.2 54.7 58.8 64.0 71.9 80.4 83.3 83.6 79.7 69.9 58.0 52.2 67.8
1994 50.0 56.9 60.8 69.6 75.1 81.4 80.8 81.3 77.8 70.8 65.3 56.5 68.9
1995 53.0 56.3 63.0 68.8 77.6 79.3 83.9 84.7 79.5 71.3 59.8 55.2 69.4
1996 52.9 55.9 58.4 67.1 78.1 80.6 82.8 81.1 79.0 70.4 63.3 57.3 68.9
1997 53.8 57.1 66.4 65.4 74.5 79.6 83.4 83.6 81.1 71.3 58.6 52.8 69.0
1998 56.1 55.9 59.8 67.5 78.8 83.7 85.3 84.6 81.1 73.3 65.4 59.1 70.9
1999 57.7 61.1 61.6 73.1 76.7 81.4 82.2 85.5 78.2 70.7 62.0 55.2 70.5
2000 56.4 60.6 66.0 68.9 80.1 81.7 84.6 84.4 79.3 69.8 59.9 49.6 70.1
2001 50.2 60.3 59.4 72.2 76.1 80.3 82.9 82.5 78.5 68.3 65.0 57.6 69.4
POR=72 YRS 53.3 56.3 61.9 68.8 75.5 80.7 82.3 82.2 78.7 70.3 61.1 55.3 68.9

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 New Orleans, Louisiana (MSY)

HEATING DEGREE DAYS (base 65 F) 2001 NEW ORLEANS, LA (MSY)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972–73 0 0 0 28 293 314 447 351 72 114 9 0 1628
1973–74 0 0 0 18 80 355 117 274 71 16 0 0 931
1974–75 0 0 0 24 194 341 270 210 183 73 0 0 1295
1975–76 0 0 6 16 222 417 445 205 98 21 0 0 1430
1976–77 0 0 0 93 375 438 664 318 117 18 0 0 2023
1977–78 0 0 0 43 113 342 646 556 191 2 0 0 1893
1978–79 0 0 0 16 39 324 586 347 128 8 2 0 1450
1979–80 0 0 0 13 230 396 278 385 154 38 0 0 1494
1980–81 0 0 0 35 195 363 504 275 123 12 0 0 1507
1981–82 0 0 0 36 100 333 365 278 127 29 0 0 1268
1982–83 0 0 0 31 146 234 453 309 217 81 1 0 1472
1983–84 0 0 1 37 183 483 564 321 197 48 2 0 1836
1984–85 0 0 2 14 214 146 605 359 62 28 0 0 1430
1985–86 0 0 0 12 49 443 421 195 160 28 0 0 1308
1986–87 0 0 0 28 85 370 464 242 168 75 0 0 1432
1987–88 0 0 0 58 149 222 490 351 166 23 0 0 1459
1988–89 0 0 0 12 92 301 186 292 155 60 0 0 1098
1989–90 0 0 0 53 142 559 253 136 101 41 0 0 1285
1990–91 0 0 0 62 122 244 371 196 105 8 0 0 1108
1991–92 0 0 0 22 312 262 426 203 128 54 5 0 1412
1992–93 0 0 0 2 240 218 248 285 209 82 0 0 1284
1993–94 0 0 0 42 259 399 464 263 177 49 0 0 1653
1994–95 0 0 0 16 72 268 375 257 123 33 0 0 1144
1995–96 0 0 0 16 186 358 380 307 248 54 1 0 1550
1996–97 0 0 0 17 116 253 373 248 58 44 0 0 1109
1997–98 0 0 0 38 202 383 273 251 210 25 0 0 1382
1998–99 0 0 0 2 48 243 263 150 118 21 0 0 845
1999–00 0 0 0 23 112 318 295 181 63 33 0 0 1025
2000–01 0 0 4 34 227 469 453 181 184 16 0 0 1568
2001– 0 0 0 44 60 249

2001 New Orleans, Louisiana (MSY)

COOLING DEGREE DAYS (base 65 F) 2001 NEW ORLEANS, LA (MSY)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 50 26 38 175 281 479 453 507 446 200 48 19 2722
1973 0 9 96 99 247 507 607 524 448 289 136 24 2986
1974 71 27 147 144 345 402 484 484 368 93 45 45 2655
1975 34 45 80 132 321 440 479 491 314 171 114 16 2637
1976 4 18 100 132 234 404 509 518 390 68 13 0 2390
1977 0 10 123 145 345 528 593 532 463 151 56 16 2962
1978 5 0 39 203 380 493 553 569 489 169 110 49 3059
1979 0 14 63 198 307 491 581 559 435 206 25 16 2895
1980 10 13 70 85 409 554 653 640 561 160 51 17 3223
1981 0 12 35 210 311 570 627 565 396 231 102 12 3071
1982 49 6 160 182 366 504 517 541 363 208 78 66 3040
1983 0 0 16 67 286 385 518 545 317 171 42 10 2357
1984 0 6 31 130 281 379 436 448 351 286 33 71 2452
1985 0 10 78 154 308 437 480 521 366 251 124 13 2742
1986 0 40 32 99 370 487 573 524 488 203 127 9 2952
1987 3 4 30 120 373 456 562 580 402 48 53 42 2673
1988 14 15 49 131 263 411 523 513 448 113 118 30 2628
1989 46 43 95 124 363 439 515 525 365 137 70 6 2728
1990 17 40 56 127 353 538 545 567 448 166 50 62 2969
1991 2 12 88 202 396 496 580 524 402 233 47 40 3022
1992 0 18 41 103 258 472 568 459 408 149 20 14 2510
1993 13 4 26 61 222 468 572 585 447 200 57 8 2663
1994 4 40 54 191 320 501 495 513 390 204 94 12 2818
1995 10 20 67 155 399 434 594 615 444 216 39 59 3052
1996 13 50 47 124 412 473 558 507 427 189 70 21 2891
1997 34 31 107 67 301 445 576 583 489 238 19 9 2899
1998 4 1 59 108 435 568 635 613 489 267 68 70 3317
1999 41 48 20 273 369 497 543 643 403 209 29 23 3098
2000 35 58 103 159 477 506 616 610 439 192 79 0 3274
2001 0 56 19 239 353 469 564 550 410 153 69 29 2911

2001 New Orleans, Louisiana (MSY)

SNOWFALL (inches) 2001 NEW ORLEANS, LA (MSY)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972–73 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.6 0.0 0.0 0.0 0.0 0.7
1973–74 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 0.0 0.0 T
1974–75 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1975–76 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1976–77 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 0.0 T
1977–78 0.0 0.0 0.0 0.0 0.0 0.0 T T 0.0 0.0 0.0 0.0 T
1978–79 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 0.0 T
1979–80 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 T
1980–81 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1981–82 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 0.0 T
1982–83 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1983–84 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1984–85 0.0 0.0 0.0 0.0 0.0 0.0 0.4 0.0 0.0 0.0 0.0 0.0 0.4
1985–86 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1986–87 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1987–88 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 T
1988–89 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 T 0.0 T
1989–90 0.0 0.0 0.0 0.0 0.0 0.5 0.0 0.0 0.0 T 0.0 0.0 0.5
1990–91 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T T 0.0 0.0 T
1991–92 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 T
1992–93 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 T
1993–94 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 T
1994–95 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 T
1995–96 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 T
1996–97
1997–98
1998–99
1999–00
2000–01 T
2001–
POR=49 YRS 0.0 0.0 0.0 0.0 T 0.1 0.0 0.1 T T T 0.0 0.2



User Contributions:

Claudia
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Aug 31, 2012 @ 11:23 pm
A little raitnoality lifts the quality of the debate here. Thanks for contributing!

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2001 New Orleans, Louisiana (MSY) forum