2001 SACRAMENTO, CALIFORNIA (SAC)



Sacramento, and the lower Sacramento Valley, has a mild climate with abundant sunshine most of the year. A nearly cloud–free sky prevails throughout the summer months, and in much of the spring and fall. The summers are usually dry with warm to hot afternoons and mostly mild nights. The rainy season generally is November through March. About 75 percent of the annual precipitation occurs then, but measurable rain falls only on an average of nine days per month during that period. The shielding effect of mountains to the north, east, and west usually modifies winter storms. The Sierra Nevada snow fields, only 70 miles east of Sacramento, usually provide an adequate water supply during the dry season, and an important recreational area in winter. Heavy snowfall and torrential rains frequently fall on the western Sierra slopes, and may produce flood conditions along the Sacramento River and its tributaries. In the valley, however, excessive rainfall as well as damaging winds are rare.

The prevailing wind at Sacramento is southerly every month but November, when it is northerly. Topographic effects, the north–south alignment of the valley, the coast range, and the Sierra Nevada strongly influence the wind flow in the valley. A sea level gap in the coast range permits cool, oceanic air to flow, occasionally, into the valley during the summer season with a marked lowering of temperature through the Sacramento–San Joaquin River Delta to the capital. In the spring and fall, a large north–to–south pressure gradient develops over the northern part of the state. Air flowing over the Siskiyou mountains to the north warms and dries as it descends to the valley floor. This gusty, blustery north wind is a local variation of the chinook. It apparently carries a form of pollen which may cause allergic responses by susceptible individuals.

As is well known, relative humidity has a marked influence on the reactions of plants and animals to temperature. The extremely low relative humidity that ordinarily accompanies high temperatures in this valley should be considered when comparing temperatures here with those of cities in more humid regions. The extreme hot spells, with temperatures exceeding 100 degrees, are usually caused by air flow from a sub–tropical high pressure area that brings light to nearly calm winds and humidities below 20 percent.

Thunderstorms are few in number, usually mild in character, and occur mainly in the spring. An occasional thunderstorm may drift over the valley from the Sierra Nevada in the summer. Snow falls so rarely, and in such small amounts, that its occurrence may be disregarded as a climatic feature. Heavy fog occurs mostly in midwinter, never in summer, and seldom in spring or autumn. An occasional winter fog, under stagnant atmospheric conditions, may continue for several days. Light and moderate fogs are more frequent, and may come anytime during the wet, cold season. The fog is the radiational cooling type, and is usually confined to the early morning hours.

Sacramento is the geographical center of the great interior valley of California that reaches from Red Bluff in the north to Bakersville in the south. This predominantly agricultural region produces an extremely wide and abundant variety of fruits, grains, and vegetables ranging from the semi–tropical to the hardier varieties.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is December 1 and the average last occurrence in the spring is February 14.

NORMALS, MEANS, AND EXTREMES

SACRAMENTO, CA (SAC)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 23232

38 30′ 45″ N  121 29′ 33″ W  GRND: 38 BARO: 41  PACIFIC (UTC + 8)

2001 Sacramento, California (SAC)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 52.7 60.0 64.0 71.1 80.3 87.8 93.2 92.1 87.3 77.9 63.1 52.7 73.5
MEAN DAILY MAXIMUM 54 53.1 59.7 64.3 71.4 80.0 87.2 90.9 91.5 87.6 77.8 63.6 53.4 73.4
HIGHEST DAILY MAXIMUM 51 70 76 88 95 105 115 114 110 108 104 87 72 115
YEAR OF OCCURRENCE 1991 1992 1988 1996 1984 1961 1972 1996 1988 2001 1960 1999 JUN 1961
MEAN OF EXTREME MAXS. 54 63.3 69.7 76.2 85.5 95.5 102.8 102.8 103.4 100.2 92.0 76.3 64.0 86.0
NORMAL DAILY MINIMUM 30 37.7 41.4 43.2 45.5 50.3 55.3 58.1 58.0 55.7 50.4 43.4 37.8 48.1
MEAN DAILY MINIMUM 54 38.2 41.4 43.0 45.8 50.5 55.1 56.7 57.7 55.9 50.2 42.8 37.9 47.9
LOWEST DAILY MINIMUM 51 23 23 26 31 36 41 48 49 43 36 26 18 18
YEAR OF OCCURRENCE 1979 1989 1971 1999 1974 1990 1983 1978 1978 1989 1993 1990 DEC 1990
MEAN OF EXTREME MINS. 54 27.7 31.5 34.1 37.7 42.1 48.0 51.3 52.0 48.7 41.5 32.3 28.2 39.6
NORMAL DRY BULB 30 45.2 50.7 53.6 58.3 65.3 71.6 75.7 75.1 71.5 64.2 53.3 45.3 60.8
MEAN DRY BULB 54 45.8 50.5 53.8 58.7 65.1 71.1 74.0 74.6 71.7 64.0 53.2 45.6 60.7
MEAN WET BULB 16 43.8 47.1 50.0 52.3 55.7 59.7 58.5 56.1 55.5 51.5 45.0 39.8 51.2
MEAN DEW POINT 16 40.9 43.1 45.2 45.9 48.3 51.7 51.4 49.3 48.5 44.7 40.8 36.8 45.5
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.4 5.8 12.5 22.5 20.0 12.4 2.8 0.0 0.0 76.4
MAXIMUM 32 30 * 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 * 0.0
MINIMUM 32 30 7.0 1.8 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.2 6.9 17.4
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 30 614 400 357 230 80 12 0 0 16 78 351 611 2749
NORMAL COOLING DEG. DAYS 30 0 0 0 29 89 210 332 313 211 53 0 0 1237
RH NORMAL (PERCENT) 30 83 77 72 64 59 55 53 56 57 63 76 83 66
HOUR 04 LST 30 90 87 84 82 81 78 76 78 77 80 86 90 82
HOUR 10 LST 30 85 77 69 58 50 47 47 50 50 57 74 84 62
HOUR 16 LST 30 70 59 53 43 35 31 28 29 31 38 58 70 45
HOUR 22 LST 30 86 81 77 73 69 64 61 64 65 70 81 86 73
S PERCENT POSSIBLE SUNSHINE 47 48 65 74 82 90 94 97 96 93 86 66 49 78
W/O MEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI) 53 10.0 5.2 1.7 0.3 0.2 0.0 0.0 0.0 0.2 1.4 5.2 9.4 33.6
THUNDERSTORMS 53 0.4 0.6 0.8 0.7 0.4 0.3 0.2 0.1 0.5 0.3 0.2 0.2 4.7
CLOUDINESS MEAN:
SUNRISE–SUNSET (OKTAS) 48 5.7 5.0 4.5 3.8 2.9 1.8 0.9 1.1 1.5 2.6 4.5 5.5 3.3
MIDNIGHT–MIDNIGHT (OKTAS) 31 5.3 4.6 3.9 3.3 2.3 1.7 0.8 1.0 1.2 2.1 3.9 4.8 2.9
MEAN NO. DAYS WITH:
CLEAR 49 6.5 7.6 9.9 11.9 16.9 21.7 26.9 25.1 23.2 18.9 9.8 7.6 186.0
PARTLY CLOUDY 49 5.9 7.0 8.7 9.6 8.6 5.9 3.2 4.1 4.2 6.0 7.4 5.8 76.4
CLOUDY 49 18.7 13.6 12.4 8.4 5.5 2.4 1.0 1.3 2.1 5.4 12.4 17.0 100.2
PR MEAN STATION PRESSURE(IN) 24 30.10 30.05 29.99 29.98 29.90 29.86 29.85 29.86 29.86 29.96 30.06 30.12 29.97
MEAN SEA–LEVEL PRES. (IN) 16 30.13 30.07 30.03 30.00 29.93 29.87 29.87 29.87 29.88 29.97 30.09 30.15 29.99
WINDS MEAN SPEED (MPH) 36 7.1 7.8 8.5 8.6 9.0 9.5 9.1 8.7 7.3 6.6 6.1 6.4 7.9
PREVAIL. DIR (TENS OF DEGS) 21 14 14 22 22 22 21 20 20 21 20 14 14 21
MAXIMUM 2–MINUTE:
SPEED (MPH) 3 35 33 36 33 38 29 26 22 25 36 38 31 38
DIR. (TENS OF DEGS) 14 24 32 35 33 33 23 22 21 35 15 15 15
YEAR OF OCCURRENCE 2001 2000 2000 1999 2001 2000 1999 2001 2000 2000 2001 2001 NOV 2001
MAXIMUM 5–SECOND:
SPEED (MPH) 3 48 40 44 43 46 35 31 29 32 44 49 44 49
DIR. (TENS OF DEGS) 13 23 14 35 33 33 22 21 22 34 16 14 16
YEAR OF OCCURRENCE 2001 2000 2001 1999 2001 2000 2001 2000 2000 2000 2001 2001 NOV 2001
PRECIPITATION NORMAL (IN) 30 3.73 2.87 2.57 1.16 0.27 0.12 0.05 0.07 0.37 1.08 2.72 2.51 17.52
MAXIMUM MONTHLY (IN) 62 9.69 9.95 8.13 4.76 3.13 1.26 0.79 0.65 2.78 7.51 7.41 12.64 12.64
YEAR OF OCCURRENCE 1995 1998 1995 1941 1948 1993 1974 1976 1989 1962 1970 1955 DEC 1955
MINIMUM MONTHLY (IN) 62 0.16 0.15 0.05 0.00 T 0.00 0.00 0.00 0.00 0.00 T 0.00 0.00
YEAR OF OCCURRENCE 1984 1964 1994 1949 1992 1981 1983 1982 1980 1966 1995 1989 DEC 1989
MAXIMUM IN 24 HOURS (IN) 53 3.41 3.01 2.30 2.22 1.38 1.21 T 0.32 0.50 5.59 2.95 3.64 5.59
YEAR OF OCCURRENCE 1967 1986 1982 1958 1994 1993 2001 1997 2001 1962 1970 1955 OCT 1962
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 9.6 8.1 8.6 5.1 2.1 1.1 0.3 0.5 1.7 3.6 7.9 8.7 57.3
PRECIPITATION 1.00 30 0.8 0.5 0.3 0.1 * 0.0 0.0 0.0 * 0.2 0.6 0.3 2.8
SNOWFALL NORMAL (IN) 30 T 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.1
MAXIMUM MONTHLY (IN) 50 T 2.0 T 0.0 T 0.0 0.0 0.0 0.0 0.0 0.0 T 2.0
YEAR OF OCCURRENCE 1974 1976 1982 1994 1995 FEB 1976
MAXIMUM IN 24 HOURS (IN) 50 T 2.0 T 0.0 T 0.0 0.0 0.0 0.0 0.0 0.0 T 2.0
YEAR OF OCCURRENCE 1974 1976 1982 1994 1995 FEB 1976
MAXIMUM SNOW DEPTH (IN) 48 0 0 0 0 0 0 0 0 0 0 0 0 0
YEAR OF OCCURRENCE
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 Sacramento, California (SAC)

PRECIPITATION (inches) 2001 SACRAMENTO, CA (SAC)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0.81 1.28 0.29 1.39 0.28 0.19 0.00 0.00 0.90 1.75 5.14 1.88 13.91
1973 6.87 5.64 2.76 0.05 0.13 0.00 0.00 0.00 0.33 1.64 6.27 2.79 26.48
1974 3.58 1.37 3.27 0.96 0.01 0.50 0.79 T 0.00 1.16 0.66 2.86 15.16
1975 0.73 4.59 4.28 0.81 T T 0.04 0.23 T 2.03 0.29 0.18 13.18
1976 0.36 1.49 0.44 1.53 0.00 0.04 0.00 0.65 0.52 0.02 0.55 0.65 6.25
1977 1.17 1.17 1.27 0.30 0.73 0.00 T 0.00 0.76 0.12 1.92 4.27 11.71
1978 9.14 4.46 3.38 2.31 T T 0.00 T 0.30 T 3.20 0.95 23.74
1979 5.66 4.55 2.47 0.76 0.14 0.00 0.25 0.00 T 1.62 1.48 3.41 20.34
1980 5.64 7.12 2.62 1.06 0.49 0.04 0.40 0.00 0.00 0.06 0.12 1.79 19.34
1981 4.56 0.87 3.55 0.66 0.50 0.00 0.00 0.00 0.25 2.57 6.09 3.28 22.33
1982 5.50 2.35 7.12 3.07 T 0.15 0.00 0.00 1.81 2.61 5.74 3.25 31.60
1983 4.92 5.56 6.75 4.21 0.25 0.40 0.00 0.11 0.66 0.40 4.91 5.26 33.43
1984 0.16 1.22 1.35 0.34 0.01 0.10 T 0.01 0.07 1.39 3.61 1.23 9.49
1985 0.66 1.52 2.01 T 0.01 0.15 T 0.06 0.56 0.53 3.72 2.34 11.56
1986 3.67 8.60 3.20 0.91 0.07 0.00 0.00 0.00 0.60 0.19 0.14 0.76 18.14
1987 2.29 3.23 3.05 0.20 T T 0.00 0.00 0.00 1.28 2.53 3.25 15.83
1988 2.96 0.99 0.17 1.58 0.89 0.19 0.00 0.00 0.00 0.19 1.68 2.73 11.38
1989 0.71 1.25 6.29 0.31 0.06 0.43 0.00 0.20 2.78 1.76 1.32 0.00 15.11
1990 4.97 2.91 0.93 0.73 2.10 0.00 T 0.00 0.00 0.09 0.43 1.60 13.76
1991 0.36 3.10 6.14 0.29 0.25 0.53 T 0.14 0.04 1.25 0.19 1.60 13.89
1992 1.39 5.47 2.05 0.92 T 0.15 0.00 T 0.00 1.31 0.28 4.94 16.51
1993 8.63 4.94 2.39 0.63 1.14 1.26 0.00 0.00 0.00 0.47 2.28 1.75 23.49
1994 2.12 3.15 0.05 0.67 1.68 0.00 0.00 0.00 2.68
1995 9.69 0.20 8.13 1.46 1.06 0.47 0.00 0.00 0.00 T T 5.49 26.50
1996 4.16 5.49 1.73 1.25 0.79 0.00 0.00 T T 0.67 1.97 6.39 22.45
1997 9.05 0.28 0.34 0.18 0.35 0.59 0.00 0.32 0.16 0.82 4.56 2.91 19.56
1998 6.40 9.95 2.47 1.05 2.98 0.58 0.00 0.00 0.23 0.76 2.84 0.58 27.84
1999 2.63 4.45 1.50 0.89 0.07 0.03 0.00 T 0.00 0.18 1.63 0.06 11.44
2000 6.49 8.49 2.03 1.39 1.17 0.04 0.00 T 0.09 1.62 0.68 0.59 22.59
2001 3.75 4.57 2.04 1.50 T 0.08 T 0.00 0.50 0.36 2.43 6.27 21.50
POR=62 YRS 3.83 3.13 2.52 1.78 0.50 0.15 0.03 0.07 0.36 0.90 2.28 2.99 18.54

2001 Sacramento, California (SAC)

AVERAGE TEMPERATURE (F) 2001 SACRAMENTO, CA (SAC)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 41.0 51.4 58.6 58.6 66.9 72.5 76.0 75.9 69.5 62.0 49.7 40.6 60.2
1973 44.3 53.1 51.1 60.8 69.4 74.6 76.8 74.2 70.8 63.4 51.9 46.9 61.4
1974 46.3 48.4 54.1 56.6 63.8 70.5 74.1 74.0 72.2 66.3 53.2 46.4 60.5
1975 43.4 49.2 50.3 51.8 68.2 73.2 77.3 76.9 77.4 65.1 54.6 47.4 61.2
1976 47.2 51.9 54.6 57.9 70.1 73.9 76.5 73.4 71.8 66.1 56.7 46.5 62.2
1977 43.8 52.4 51.0 62.2 59.4 72.2 74.2 73.9 68.8 63.9 54.5 49.6 60.5
1978 50.3 51.9 57.2 55.8 66.4 70.0 75.1 75.0 69.6 65.9 49.8 41.7 60.7
1979 45.3 48.8 54.6 56.9 66.7 71.9 75.6 73.1 74.6 64.0 51.7 46.7 60.8
1980 46.9 51.9 51.6 59.6 62.7 66.8 75.0 71.4 69.4 63.7 53.5 45.4 59.8
1981 46.8 50.4 51.2 57.9 64.7 74.8 75.1 74.5 69.7 63.5 60.3 48.6 61.5
1982 42.0 50.5 50.8 55.5 64.6 66.2 72.1 71.7 68.2 61.0 46.9 43.0 57.7
1983 43.1 52.2 53.4 54.7 64.2 70.8 72.2 76.6 74.9 67.5 53.7 51.0 61.2
1984 48.2 50.2 58.1 58.7 70.0 71.7 78.3 75.3 75.5 62.8 53.6 45.1 62.3
1985 42.4 51.4 50.8 61.5 63.2 75.1 77.0 72.9 68.5 63.3 49.8 42.6 59.9
1986 51.4 54.7 58.8 58.4 65.5 71.6 75.0 75.2 66.2 64.8 55.5 45.7 61.9
1987 44.9 51.3 53.8 62.7 69.1 72.4 71.8 74.9 71.8 67.6 53.4 47.2 61.7
1988 48.0 54.2 58.0 60.9 64.7 72.9 80.4 75.9 72.5 66.5 53.8 46.2 62.8
1989 44.1 47.1 55.6 63.2 65.8 71.7 76.2 73.8 69.6 62.4 54.3 44.3 60.7
1990 47.5 48.6 55.4 63.4 65.5 72.4 77.7 76.6 74.0 66.6 53.0 41.0 61.8
1991 47.3 55.0 51.0 58.0 63.3 70.2 77.1 73.2 74.8 68.8 55.9 46.3 61.7
1992 43.6 54.1 56.2 62.1 70.6 70.9 75.3 77.0 72.4 66.6 53.4 44.1 62.2
1993 45.2 49.5 57.9 58.4 64.6 71.7 74.3 74.1 71.5 65.0 51.5 44.3 60.7
1994 47.0 48.8 56.7 60.1 65.3 71.6 74.0 75.2 71.7 47.6 43.7
1995 51.3 52.1 53.0 57.7 63.1 69.0 74.2 75.1 72.3 59.3 51.1
1996 48.2 54.3 56.7 61.1 67.0 73.3 78.7 78.3 71.0 63.9 55.0 51.1 63.2
1997 48.3 52.7 57.9 62.4 71.9 72.9 76.5 75.9 75.1 64.1 56.9 46.2 63.4
1998 49.7 50.4 55.1 57.5 58.7 67.0 74.8 76.8 72.6 61.3 52.5 42.5 59.9
1999 44.7 48.1 50.8 57.4 62.8 69.9 72.0 73.0 72.3 65.1 54.6 46.8 59.8
2000 48.8 51.4 55.5 60.7 65.7 73.2 72.1 74.0 71.2 61.9 48.6 47.0 60.8
2001 45.8 48.8 57.2 55.9 71.7 73.4 73.4 74.5 71.1 65.8 55.9 48.8 61.9
POR=61 YRS 45.7 50.4 53.8 58.6 65.0 70.9 74.1 74.4 71.6 63.9 53.1 45.8 60.6

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 Sacramento, California (SAC)

HEATING DEGREE DAYS (base 65 F) 2001 SACRAMENTO, CA (SAC)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972–73 0 0 6 115 451 749 636 325 424 141 15 1 2863
1973–74 0 0 0 77 384 553 571 456 332 251 93 9 2726
1974–75 7 0 0 44 347 569 661 435 449 389 69 1 2971
1975–76 0 0 0 72 306 539 547 374 315 211 1 3 2368
1976–77 0 0 1 44 252 567 650 345 424 92 187 9 2571
1977–78 0 0 17 68 309 472 451 362 235 269 46 0 2229
1978–79 0 0 11 51 449 715 606 446 313 236 57 2 2886
1979–80 0 0 0 100 391 558 551 373 408 164 107 29 2681
1980–81 2 0 4 134 339 596 557 405 420 229 81 2 2769
1981–82 0 0 9 66 145 498 708 398 434 282 70 40 2650
1982–83 3 0 31 125 532 675 670 353 354 303 99 4 3149
1983–84 3 0 0 7 333 425 514 421 206 191 22 11 2133
1984–85 0 0 0 115 335 611 693 377 433 122 89 11 2786
1985–86 0 2 15 95 450 689 411 284 192 200 73 0 2411
1986–87 0 0 53 47 277 593 614 377 340 95 37 0 2433
1987–88 1 0 0 11 339 544 522 307 212 138 94 27 2195
1988–89 0 0 3 38 329 576 640 496 285 106 50 3 2526
1989–90 0 0 11 107 316 634 536 453 289 71 53 6 2476
1990–91 0 0 0 24 356 739 543 274 427 205 104 6 2678
1991–92 0 0 0 82 267 572 657 310 265 104 0 9 2266
1992–93 0 0 0 24 340 643 605 426 214 202 55 21 2530
1993–94 0 0 5 33 399 634 550 449 248 147 48 1 2514
1994–95 0 0 0 515 654 415 354 364 210 105 26
1995–96 0 0 0 166 421 513 302 250 154 21 1
1996–97 0 0 0 121 294 423 511 336 214 104 7 1 2011
1997–98 0 0 0 56 248 577 465 404 299 233 190 13 2485
1998–99 0 0 8 113 367 689 621 465 431 239 92 29 3054
1999–00 1 0 0 57 303 556 496 389 291 138 83 2 2316
2000–01 0 4 5 123 484 551 588 445 240 276 4 0 2720
2001– 0 0 0 44 264 496

2001 Sacramento, California (SAC)

COOLING DEGREE DAYS (base 65 F) 2001 SACRAMENTO, CA (SAC)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 6 5 129 245 351 349 147 30 0 0 1262
1973 0 0 0 19 156 295 373 293 181 34 0 0 1351
1974 0 0 0 5 61 180 296 285 222 89 0 0 1138
1975 0 0 0 0 177 258 388 375 375 81 0 0 1654
1976 0 0 1 8 167 278 363 270 213 83 8 0 1391
1977 0 0 0 12 19 230 290 284 139 40 0 0 1014
1978 0 0 0 0 98 157 318 315 157 87 0 0 1132
1979 0 0 0 0 117 214 336 260 295 72 0 0 1294
1980 0 0 0 8 42 91 317 207 145 99 0 0 909
1981 0 0 0 26 78 303 318 301 155 28 7 0 1216
1982 0 0 0 2 67 83 230 213 133 9 0 0 737
1983 0 0 0 0 81 183 235 368 304 92 0 0 1263
1984 0 0 0 6 183 216 419 327 320 57 0 0 1528
1985 0 0 0 22 41 319 380 254 128 48 0 0 1192
1986 0 0 10 9 95 207 315 321 95 47 0 0 1099
1987 0 0 0 34 171 234 220 314 212 100 0 0 1285
1988 0 0 5 22 88 269 484 346 233 92 0 0 1539
1989 0 0 1 60 83 211 354 280 158 32 0 0 1179
1990 0 0 0 33 75 236 399 367 276 82 0 0 1468
1991 0 0 0 3 54 171 379 261 300 208 0 0 1376
1992 0 0 0 23 180 193 330 381 231 81 0 0 1419
1993 0 0 1 9 49 227 294 291 207 38 0 0 1116
1994 0 0 0 9 67 205 285 320 209 0 0
1995 0 0 0 0 54 152 294 322 228 0 0
1996 0 0 0 42 91 258 430 422 187 96 0 0 1526
1997 0 0 1 31 227 244 362 348 312 33 11 0 1569
1998 0 0 0 12 2 78 311 371 241 8 0 0 1023
1999 0 0 0 17 30 184 225 253 225 69 0 0 1003
2000 0 0 2 15 111 255 227 290 198 32 0 0 1130
2001 0 0 4 9 219 259 266 300 190 75 0 0 1322

2001 Sacramento, California (SAC)

SNOWFALL (inches) 2001 SACRAMENTO, CA (SAC)
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 T 0.0 0.0 0.0 0.0 0.0 0.0 T
1973–74 0.0 0.0 0.0 0.0 0.0 0.0 T 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 2.0 0.0 0.0 0.0 0.0 2.0
1976–77 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
1977–78 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
1978–79 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
1979–80 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
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 0.0 0.0 T 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 0.0 0.0 0.0 0.0 0.0 0.0 0.0
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 0.0 0.0 0.0 0.0 0.0 0.0
1988–89 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 0.0 0.0 T
1989–90 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
1990–91 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
1991–92 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
1992–93 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 0.0 0.0 T
1993–94 0.0 0.0 0.0 0.0 0.0 T 0.0 T 0.0 0.0 T 0.0 T
1994–95 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1995–96 0.0 0.0 0.0 0.0 0.0 T 0.0 T 0.0 0.0 0.0 0.0 T
1996–97 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
1997–98 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1998–99
1999–00
2000–01
2001–
POR=48 YRS 0.0 0.0 0.0 0.0 0.0 T T 0.0 T 0.0 T 0.0 T



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