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H I S T O R I C A L   W E A T H E R   D A T A

Average Temperature
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
F68.151.354.361.668.574.88081.981.578.169.161.154.5
C20101216202326272725201612
Years Charted: 30 Source: National Weather Service, San Francisco
Results based on data collected from 1961 - 1990


Average High Temperature
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
F77.660.864.171.678.584.489.290.690.286.679.471.164.3
C25161722252931323230262117
Years Charted: 30 Source: National Weather Service, San Francisco
Results based on data collected from 1961 - 1990


Average Low Temperature
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
F58.541.844.451.658.465.270.873.172.869.558.75144.8
C14561014182122222014107
Years Charted: 30 Source: National Weather Service, San Francisco
Results based on data collected from 1961 - 1990


Highest Recorded Temperature
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
F1028385899296100101102101928784
C38282931333537383838333028
Years Charted: 47 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Lowest Recorded Temperature
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
F11141925324150606042352411
C-11-10-7-30510151551-4-11
Years Charted: 47 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Mean Number of Days Below 32F/0C
 TotalJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
Days13531---00000014
Years Charted: 47 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Average Precipitation
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
in.61.885.056.014.94.54.565.846.126.175.513.054.425.75
mm157112815212411411514815515613977112146
Years Charted: 30 Source: National Weather Service, San Francisco
Results based on data collected from 1961 - 1990


Average Snowfall
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
in.0.200.10000000000.1
mm5020000000002
Years Charted: 47 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Average Wind Speed
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
mph8.29.39.89.99.48.26.96.167.37.68.79.1
km/h131415151513119911121314
Years Charted: 45 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Average Days of Precipitation
 TotalJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
Days114109978111413106710
Years Charted: 45 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Days With Sunshine
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
%58465158636464606161665548
Years Charted: 20 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Mean Number of Cloudy Days
 TotalJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
Days1461714151211912101081216
Years Charted: 45 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Mean Number of Partly Cloudy Days
 TotalJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
Days118768101113151411887
Years Charted: 45 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Mean Number of Clear Days
 TotalJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
Days10178889847915108
Years Charted: 45 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Average Morning Relative Humidity
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
%88858485888990919289888686
Years Charted: 45 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Average Afternoon Relative Humidity
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
%63666360596063666665596166
Years Charted: 45 Source: National Weather Service, San Francisco
Results based on data collected through 1993





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