Portola, California
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -7° -30° (1971) 18.9° (1961) 4.06" 10.1"
February -6° -29.4° (1949) 22.2° (1986) 4.03" 11.8"
March -4° 11° -24.4° (1952) 26.7° (1966) 3.36" 5.6"
April -2° 14° -15.6° (1975) 29.4° (1981) 1.37" 2.7"
May 19° -10.6° (1950) 34.4° (2003) 0.96" 0.3"
June 25° -6.7° (2002) 43.9° (2006) 0.52" 0.1"
July 29° -5.6° (1976) 39.4° (2002) 0.28" 0"
August 29° -5° (1960) 41.7° (1981) 0.28" 0"
September 25° -10° (1950) 37.8° (1955) 0.6" 0"
October -1° 19° -12.8° (1971) 33.3° (1980) 1.27" 0.3"
November -4° 10° -17.8° (1975) 24.4° (1949) 2.59" 4.3"
December -7° -33.3° (1972) 21.1° (1958) 4.09" 7.8"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 27° -2° (1951) 37° (1955) 0.01" 0"
Sep 2 27° -5° (1964) 38° (1955) 0.01" 0"
Sep 3 27° -3° (1964) 37° (1955) 0.01" 0"
Sep 4 27° -3° (1961) 37° (1955) 0.01" 0"
Sep 5 27° -3° (1954) 37° (1955) 0.01" 0"
Sep 6 27° -4° (1964) 34° (1955) 0.01" 0"
Sep 7 26° -3° (1964) 35° (1957) 0.01" 0"
Sep 8 26° -3° (1952) 34° (1957) 0.02" 0"
Sep 9 26° -3° (1961) 34° (1957) 0.01" 0"
Sep 10 26° -4° (1952) 34° (1948) 0.01" 0"
Sep 11 26° -3° (1961) 34° (1953) 0.01" 0"
Sep 12 26° -4° (1972) 33° (1979) 0.02" 0"
Sep 13 26° -3° (1954) 33° (1953) 0.02" 0"
Sep 14 25° -6° (1970) 34° (1971) 0.02" 0"
Sep 15 25° -4° (1970) 35° (1979) 0.02" 0"
Sep 16 25° -4.4° (2006) 34° (1979) 0.02" 0"
Sep 17 25° -4° (1965) 33° (1962) 0.02" 0"
Sep 18 25° -8° (1965) 33° (1974) 0.03" 0"
Sep 19 25° -6° (1954) 33° (1974) 0.02" 0"
Sep 20 24° -4° (1968) 33° (1974) 0.02" 0"
Sep 21 24° -6° (1968) 35° (1992) 0.03" 0"
Sep 22 24° -6° (1960) 33° (1949) 0.03" 0"
Sep 23 24° -4° (1971) 32° (1974) 0.03" 0"
Sep 24 24° -4° (1993) 32° (1974) 0.02" 0"
Sep 25 24° -6° (1948) 33° (2009) 0.03" 0"
Sep 26 23° -6° (1955) 33° (2009) 0.03" 0"
Sep 27 23° -4° (1948) 33° (2009) 0.03" 0"
Sep 28 23° -6° (1959) 33° (2009) 0.03" 0"
Sep 29 23° -7° (1971) 33° (2010) 0.03" 0"
Sep 30 23° -10° (1950) 33° (1980) 0.03" 0"
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