Portola Valley, California
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 36° 60° 20° (1976) 75° (1984) 6.16" NA
February 39° 64° 17° (1989) 84° (1995) 5.79" NA
March 41° 67° 28° (1976) 91° (2004) 4.57" NA
April 42° 73° 30° (1976) 99° (1996) 1.64" NA
May 45° 78° 33° (1986) 105° (2001) 0.64" NA
June 48° 84° 36° (1982) 108° (1995) 0.13" NA
July 51° 88° 35° (1981) 114° (2006) 0.04" NA
August 51° 88° 38° (1987) 110° (1993) 0.14" NA
September 49° 85° 38° (1987) 108° (2000) 0.26" NA
October 45° 79° 30° (2007) 106° (1996) 1.27" NA
November 40° 66° 23° (1987) 90° (1997) 3.86" NA
December 36° 60° 22° (1985) 76° (1988) 4.21" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 37° 62° 29° (1976) 76° (1988) 0.13" NA
Dec 2 37° 62° 27° (2004) 72° (1975) 0.13" NA
Dec 3 37° 61° 28° (2004) 72° (1979) 0.13" NA
Dec 4 37° 61° 30° (1991) 71° (1977) 0.13" NA
Dec 5 36° 61° 28° (1991) 72° (1979) 0.13" NA
Dec 6 36° 61° 31° (1976) 75° (1979) 0.13" NA
Dec 7 36° 61° 25° (1978) 74° (1979) 0.13" NA
Dec 8 36° 61° 22° (1978) 70° (1975) 0.13" NA
Dec 9 36° 61° 27° (1978) 70° (1979) 0.13" NA
Dec 10 36° 60° 27° (1994) 67° (2003) 0.13" NA
Dec 11 36° 60° 25° (1985) 70° (1988) 0.13" NA
Dec 12 36° 60° 22° (1985) 72° (2003) 0.13" NA
Dec 13 36° 60° 23° (1985) 67° (1988) 0.13" NA
Dec 14 36° 60° 25° (1989) 70° (1988) 0.13" NA
Dec 15 36° 60° 26° (1975) 70° (1976) 0.13" NA
Dec 16 35° 60° 28° (1978) 67° (1986) 0.13" NA
Dec 17 35° 60° 27° (1984) 72° (2003) 0.13" NA
Dec 18 35° 59° 28° (1975) 70° (2003) 0.13" NA
Dec 19 35° 59° 27° (1992) 73° (1999) 0.13" NA
Dec 20 35° 59° 26° (1978) 72° (1999) 0.13" NA
Dec 21 35° 59° 27° (1978) 73° (1999) 0.13" NA
Dec 22 35° 59° 26° (1978) 70° (1999) 0.14" NA
Dec 23 35° 59° 26° (1978) 71° (1999) 0.14" NA
Dec 24 35° 59° 23° (2003) 67° (1999) 0.14" NA
Dec 25 35° 59° 24° (1987) 69° (1999) 0.14" NA
Dec 26 35° 59° 25° (1988) 65° (1999) 0.15" NA
Dec 27 35° 59° 27° (1976) 68° (1995) 0.15" NA
Dec 28 35° 59° 27° (1976) 72° (1975) 0.15" NA
Dec 29 35° 59° 26° (1974) 69° (1999) 0.15" NA
Dec 30 35° 59° 24° (1978) 68° (1989) 0.16" NA
Dec 31 35° 59° 22° (1978) 66° (1977) 0.16" NA
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