CXUS56 KMTR 010834 CLMSFO CLIMATE REPORT NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 1234 AM PST THU JAN 01 2026 ................................... ...THE SAN FRANCISCO AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2025... CLIMATE NORMAL PERIOD: 1991 TO 2020 CLIMATE RECORD PERIOD: 1927 TO 2025 WEATHER OBSERVED NORMAL DEPART LAST YEAR'S VALUE DATE(S) VALUE FROM VALUE DATE(S) NORMAL ................................................................ TEMPERATURE (F) RECORD HIGH 75 12/12/1958 12/04/1958 12/02/1958 LOW 24 12/09/1972 HIGHEST 65 12/22 67 12/03 12/06 LOWEST 43 12/05 43 12/15 12/13 12/28 12/31 AVG. MAXIMUM 57.2 58.2 -1.0 60.6 AVG. MINIMUM 47.9 48.6 MEAN 52.5 51.4 1.1 54.6 DAYS MAX >= 90 0 0 DAYS MAX <= 32 0 0 DAYS MIN <= 32 0 0 DAYS MIN <= 0 0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 12.30 1955 MINIMUM 0.01 1989 TOTALS 4.39 4.14 0.25 1.52 DAILY AVG. 0.14 0.13 0.01 0.15 DAYS >= .01 10 8 DAYS >= .10 8 6 DAYS >= .50 4 0 DAYS >= 1.00 1 0 GREATEST 24 HR. TOTAL 1.16 12/24 TO 12/25 0.48 12/26 TO 12/27 DEGREE DAYS HEATING TOTAL 379 422 -43 310 SINCE 7/1 730 927 -197 MM COOLING TOTAL 0 0 0 0 SINCE 1/1 150 201 -51 MM ................................................................ WIND (MPH) AVERAGE WIND SPEED 7.0 RESULTANT WIND SPEED/DIRECTION 2/110 HIGHEST WIND SPEED/DIRECTION 53/170 DATE 12/25 HIGHEST GUST SPEED/DIRECTION 72/230 DATE 12/25 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.57 NUMBER OF DAYS FAIR 7 NUMBER OF DAYS PC 13 NUMBER OF DAYS CLOUDY 11 AVERAGE RH (PERCENT) 81 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 2 MIXED PRECIP 0 HEAVY RAIN 3 RAIN 6 LIGHT RAIN 10 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 29 FOG W/VIS <= 1/4 MILE 0 HAZE 27 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$