Weather Averages San Francisco, CA

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Weather Averages for
San Francisco, CA



Latitude: 37°46'N, Longitude: 122°26'W, Elevation: 39.0 m, Distance: 0.63 km

  Unit Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average temperature
over 72 years
°C 13 10 12 12 13 14 15 15 16 17 16 14 11
Average high temperature
over 72 years
°C 17 13 15 16 17 17 18 18 18 21 20 17 13
Average low temperature
over 72 years
°C 10 7 8 9 10 10 11 12 12 13 12 10 8
Highest recorded temperature
over 72 years
°C 39 26 27 28 34 35 38 39 35 38 38 30 24
Lowest recorded temperature
over 72 years
°C -2 -1 0 1 4 6 8 8 8 8 6 3 -2
Average number of rainy days
over 57 years
days 67 11 10 11 6 3 1 - 1 2 4 8 10
Average number of days above 27°C
over 72 years
days 2 - - - - - - - - 1 - - -
Average precipitation
over 63 years
cm 51.8 10.4 8.9 7.4 3.8 1.3 0.5 - - 0.5 2.8 6.6 9.9
Most recorded rainfall
over 63 years
cm 111.3 27.2 25.7 22.9 14.0 10.2 3.6 0.5 1.3 5.3 14.0 20.8 29.2
Least recorded rainfall
over 63 years
cm 25.4 1.3 - - - - - - - - - - -
Average number of days with thunderstorms
over 7 years
days 5 - 1 - 1 - - 1 1 - 1 - -
Average number of days with fog
over 7 years
days 1 - 1 - - - - - - - - - -
Average morning relative humidity
over 7 years
% 85 81 83 81 82 89 89 92 93 87 81 82 80
Average evening relative humidity
over 7 years
% 66 63 63 61 61 68 72 74 73 66 60 63 63
Average wind speed
over 28 years
km/h 14.0 10.8 12.1 13.7 15.3 16.7 17.5 18.0 16.9 14.6 12.2 10.1 10.5
Heating degree days
over 30 years
days 3005 431 297 313 275 260 198 187 156 116 123 237 412
Cooling degree days
over 30 years
days 65 - - - - - - - - 35 30 - -
Average possibility of sunshine
over 38 years
% 66 56 62 69 73 72 73 66 65 72 70 62 53
Average number of days below 4.5°C
over 72 years
days 41 15 7 4 2 - - - - - - 1 11
Average number of days above 19.5°C
over 72 years
days 29 - - 1 2 3 3 2 2 6 7 2 -