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
Apr 1 42° 70° 30° (1976) 88° (2000) 0.09" NA
Apr 2 42° 71° 30° (1976) 93° (2000) 0.08" NA
Apr 3 42° 71° 32° (1975) 83° (1997) 0.08" NA
Apr 4 42° 71° 34° (1974) 82° (1990) 0.09" NA
Apr 5 42° 71° 34° (1997) 90° (1989) 0.08" NA
Apr 6 42° 71° 32° (1984) 94° (1989) 0.08" NA
Apr 7 42° 71° 33° (1982) 93° (1989) 0.08" NA
Apr 8 42° 72° 32° (1984) 95° (1989) 0.06" NA
Apr 9 42° 72° 32° (1999) 90° (1989) 0.07" NA
Apr 10 42° 72° 35° (1974) 91° (1988) 0.07" NA
Apr 11 42° 72° 30° (2009) 92° (1988) 0.07" NA
Apr 12 42° 72° 34° (1991) 88° (1990) 0.06" NA
Apr 13 42° 72° 32° (1983) 93° (1990) 0.06" NA
Apr 14 42° 73° 31° (1983) 91° (1984) 0.06" NA
Apr 15 42° 73° 35° (1974) 89° (1999) 0.06" NA
Apr 16 42° 73° 34° (1975) 92° (1999) 0.06" NA
Apr 17 43° 73° 32° (1975) 89° (1999) 0.05" NA
Apr 18 43° 74° 36° (1973) 88° (1999) 0.06" NA
Apr 19 43° 74° 32° (1979) 92° (2009) 0.06" NA
Apr 20 43° 74° 34° (1979) 95° (2009) 0.05" NA
Apr 21 43° 74° 35° (1995) 97° (2009) 0.06" NA
Apr 22 43° 74° 34° (1995) 96° (2009) 0.05" NA
Apr 23 43° 75° 30° (2009) 87° (1995) 0.05" NA
Apr 24 43° 75° 36° (1989) 90° (2004) 0.06" NA
Apr 25 43° 75° 33° (1975) 92° (2004) 0.05" NA
Apr 26 44° 75° 35° (1986) 98° (2004) 0.04" NA
Apr 27 44° 75° 31° (1974) 98° (2004) 0.05" NA
Apr 28 44° 76° 34° (1991) 94° (1981) 0.04" NA
Apr 29 44° 76° 33° (1988) 96° (1981) 0.04" NA
Apr 30 44° 76° 32° (1986) 99° (1996) 0.04" NA
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