Portola, California
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 18° 41° -22° (1971) 66° (1961) 4.17" 16.1"
February 21° 45° -21° (1949) 72° (1986) 3.87" 12.8"
March 26° 49° -12° (1952) 80° (1966) 3.61" 10.2"
April 29° 57° 4° (1975) 85° (1981) 1.23" 4"
May 34° 66° 13° (1950) 94° (2003) 1.12" 1.1"
June 39° 76° 20° (2002) 111° (2006) 0.54" 0"
July 42° 84° 22° (1976) 103° (2002) 0.34" 0"
August 40° 84° 23° (1960) 107° (1981) 0.43" 0"
September 35° 76° 14° (1950) 100° (1955) 0.78" 0.1"
October 29° 65° 9° (1971) 92° (1980) 1.22" 0.2"
November 23° 50° 0° (1975) 76° (1949) 2.5" 5.6"
December 18° 42° -28° (1972) 70° (1958) 3.28" 18.7"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 38° 80° 29° (1951) 99° (1955) 0.02" NA
Sep 2 38° 80° 23° (1964) 100° (1955) 0.02" NA
Sep 3 38° 80° 26° (1964) 99° (1955) 0.02" NA
Sep 4 37° 80° 27° (1961) 98° (1955) 0.02" NA
Sep 5 37° 79° 26° (1954) 98° (1955) 0.02" NA
Sep 6 37° 79° 25° (1964) 94° (1955) 0.02" NA
Sep 7 37° 79° 26° (1964) 95° (1957) 0.02" NA
Sep 8 37° 79° 27° (1952) 94° (1957) 0.02" NA
Sep 9 37° 78° 26° (1961) 94° (1957) 0.02" NA
Sep 10 36° 78° 24° (1952) 93° (1948) 0.02" NA
Sep 11 36° 78° 26° (1961) 93° (1953) 0.02" NA
Sep 12 36° 78° 24° (1972) 92° (1979) 0.02" NA
Sep 13 36° 77° 27° (1954) 92° (1953) 0.03" NA
Sep 14 36° 77° 22° (1970) 94° (1971) 0.03" NA
Sep 15 35° 77° 25° (1970) 95° (1979) 0.03" NA
Sep 16 35° 76° 24° (2006) 93° (1979) 0.03" NA
Sep 17 35° 76° 24° (1965) 91° (1962) 0.03" NA
Sep 18 35° 76° 18° (1965) 91° (1974) 0.03" NA
Sep 19 35° 75° 22° (1954) 92° (1974) 0.03" NA
Sep 20 34° 75° 24° (1968) 91° (1974) 0.03" NA
Sep 21 34° 75° 21° (1968) 95° (1992) 0.03" NA
Sep 22 34° 75° 21° (1960) 91° (1949) 0.03" NA
Sep 23 34° 74° 24° (1971) 90° (1974) 0.03" NA
Sep 24 33° 74° 25° (1993) 90° (1974) 0.03" NA
Sep 25 33° 74° 21° (1948) 90° (1974) 0.03" NA
Sep 26 33° 73° 22° (1955) 90° (1963) 0.03" NA
Sep 27 33° 73° 24° (1948) 87° (1963) 0.03" NA
Sep 28 33° 73° 21° (1959) 90° (2003) 0.03" NA
Sep 29 32° 72° 20° (1971) 90° (1980) 0.03" NA
Sep 30 32° 72° 14° (1950) 92° (1980) 0.03" NA
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