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
Oct 1 48° 83° 40° (1982) 96° (2001) 0.01" NA
Oct 2 47° 83° 42° (1973) 98° (1978) 0.01" NA
Oct 3 47° 83° 39° (1973) 98° (1985) 0.01" NA
Oct 4 47° 83° 38° (1973) 102° (1987) 0.02" NA
Oct 5 47° 82° 39° (1981) 104° (1987) 0.02" NA
Oct 6 47° 82° 39° (1977) 99° (1996) 0.02" NA
Oct 7 47° 82° 41° (1982) 104° (1996) 0.02" NA
Oct 8 46° 82° 30° (2007) 106° (1996) 0.02" NA
Oct 9 46° 81° 38° (1985) 98° (1992) 0.02" NA
Oct 10 46° 81° 38° (1985) 100° (1991) 0.02" NA
Oct 11 46° 81° 37° (1985) 95° (1991) 0.02" NA
Oct 12 46° 80° 36° (1981) 96° (2001) 0.03" NA
Oct 13 46° 80° 34° (1985) 97° (1978) 0.03" NA
Oct 14 46° 80° 35° (1985) 97° (1991) 0.03" NA
Oct 15 45° 79° 36° (1981) 94° (1997) 0.03" NA
Oct 16 45° 79° 33° (1981) 94° (1997) 0.04" NA
Oct 17 45° 79° 35° (1981) 95° (1974) 0.04" NA
Oct 18 45° 78° 37° (1984) 89° (1974) 0.04" NA
Oct 19 45° 78° 39° (1981) 95° (1991) 0.04" NA
Oct 20 44° 78° 35° (2007) 97° (1991) 0.05" NA
Oct 21 44° 77° 35° (1996) 89° (1999) 0.05" NA
Oct 22 44° 77° 35° (1996) 88° (2003) 0.05" NA
Oct 23 44° 76° 35° (1975) 90° (2007) 0.06" NA
Oct 24 44° 76° 36° (1975) 93° (2003) 0.06" NA
Oct 25 44° 76° 32° (1997) 95° (2003) 0.06" NA
Oct 26 43° 75° 38° (1989) 97° (2003) 0.07" NA
Oct 27 43° 75° 36° (1984) 98° (2003) 0.07" NA
Oct 28 43° 74° 34° (1976) 96° (2003) 0.08" NA
Oct 29 43° 74° 33° (1985) 89° (2003) 0.08" NA
Oct 30 43° 73° 34° (1989) 85° (1973) 0.08" NA
Oct 31 42° 73° 33° (1991) 84° (1973) 0.09" NA
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