Portola Valley, California
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 37° 61° 20° (1976) 75° (1984) 5.98" NA
February 39° 64° 17° (1989) 84° (1995) 6.21" NA
March 41° 68° 28° (1976) 91° (2004) 4.29" NA
April 43° 73° 30° (1976) 99° (1996) 1.85" NA
May 46° 79° 33° (1986) 105° (2001) 0.76" NA
June 49° 84° 36° (1982) 108° (1995) 0.15" NA
July 52° 89° 35° (1981) 114° (2006) 0.01" NA
August 51° 88° 38° (1987) 110° (1993) 0.06" NA
September 50° 87° 38° (1987) 108° (2000) 0.17" NA
October 46° 79° 30° (2007) 106° (1996) 1.14" NA
November 40° 67° 23° (1987) 90° (1997) 3.7" NA
December 36° 60° 22° (1985) 76° (1988) 5.47" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 38° 62° 29° (1976) 76° (1988) 0.17" NA
Dec 2 38° 62° 27° (2004) 72° (1975) 0.16" NA
Dec 3 38° 62° 28° (2004) 72° (1979) 0.14" NA
Dec 4 37° 62° 30° (1991) 71° (1977) 0.16" NA
Dec 5 37° 61° 28° (1991) 72° (1979) 0.15" NA
Dec 6 37° 61° 28° (2009) 75° (1979) 0.16" NA
Dec 7 37° 61° 25° (1978) 74° (1979) 0.16" NA
Dec 8 37° 61° 22° (1978) 70° (1975) 0.18" NA
Dec 9 37° 61° 27° (1978) 70° (1979) 0.16" NA
Dec 10 37° 61° 23° (2009) 67° (2003) 0.17" NA
Dec 11 37° 60° 25° (1985) 70° (1988) 0.17" NA
Dec 12 36° 60° 22° (1985) 72° (2003) 0.16" NA
Dec 13 36° 60° 20° (2008) 67° (1988) 0.17" NA
Dec 14 36° 60° 25° (1989) 70° (1988) 0.16" NA
Dec 15 36° 60° 26° (1975) 70° (1976) 0.18" NA
Dec 16 36° 60° 28° (1978) 67° (1986) 0.18" NA
Dec 17 36° 60° 27° (1984) 72° (2003) 0.18" NA
Dec 18 36° 60° 28° (1975) 70° (2003) 0.19" NA
Dec 19 36° 60° 27° (1992) 73° (1999) 0.19" NA
Dec 20 36° 60° 26° (1978) 72° (1999) 0.19" NA
Dec 21 36° 60° 27° (1978) 73° (1999) 0.2" NA
Dec 22 36° 60° 26° (1978) 70° (1999) 0.19" NA
Dec 23 36° 60° 26° (1978) 71° (1999) 0.19" NA
Dec 24 36° 60° 23° (2003) 70° (2005) 0.19" NA
Dec 25 36° 60° 24° (1987) 69° (1999) 0.19" NA
Dec 26 36° 60° 25° (1988) 65° (1999) 0.18" NA
Dec 27 36° 60° 27° (1976) 68° (1995) 0.19" NA
Dec 28 36° 60° 27° (1976) 72° (1975) 0.18" NA
Dec 29 36° 60° 26° (1974) 69° (1999) 0.19" NA
Dec 30 36° 60° 24° (1978) 68° (1989) 0.19" NA
Dec 31 36° 60° 22° (1978) 66° (1977) 0.2" NA
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