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
May 1 43° 75° 35° (1988) 97° (1996) 0.03" NA
May 2 43° 75° 36° (1975) 94° (2004) 0.03" NA
May 3 43° 76° 37° (1999) 93° (1990) 0.03" NA
May 4 44° 76° 37° (1996) 96° (1990) 0.03" NA
May 5 44° 76° 35° (1975) 99° (1987) 0.03" NA
May 6 44° 76° 34° (1975) 101° (1987) 0.03" NA
May 7 44° 76° 33° (1986) 102° (1987) 0.03" NA
May 8 44° 76° 35° (1985) 100° (2001) 0.03" NA
May 9 44° 76° 37° (1996) 93° (1993) 0.02" NA
May 10 44° 77° 38° (1991) 96° (2001) 0.02" NA
May 11 44° 77° 36° (1982) 96° (1996) 0.02" NA
May 12 45° 77° 35° (1985) 102° (1976) 0.02" NA
May 13 45° 77° 37° (1999) 99° (1976) 0.02" NA
May 14 45° 77° 37° (1999) 97° (1976) 0.02" NA
May 15 45° 78° 35° (1981) 94° (1976) 0.02" NA
May 16 45° 78° 37° (1974) 101° (1997) 0.02" NA
May 17 45° 78° 36° (1976) 104° (1997) 0.02" NA
May 18 45° 78° 36° (1977) 101° (1997) 0.02" NA
May 19 45° 78° 37° (1976) 94° (1978) 0.02" NA
May 20 45° 79° 38° (1976) 98° (1988) 0.02" NA
May 21 46° 79° 36° (1974) 104° (2000) 0.02" NA
May 22 46° 79° 38° (1986) 101° (2000) 0.02" NA
May 23 46° 79° 39° (1986) 97° (1982) 0.02" NA
May 24 46° 79° 40° (1986) 99° (1982) 0.02" NA
May 25 46° 80° 39° (1990) 98° (1982) 0.02" NA
May 26 46° 80° 40° (1991) 99° (1974) 0.01" NA
May 27 46° 80° 40° (1991) 100° (1984) 0.01" NA
May 28 46° 80° 38° (1976) 100° (1984) 0.01" NA
May 29 47° 81° 38° (1985) 98° (1975) 0.01" NA
May 30 47° 81° 38° (1974) 105° (2001) 0.01" NA
May 31 47° 81° 41° (1974) 104° (2001) 0.01" NA
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