Portola, California
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -8° -30° (1971) 18.9° (1961) 4.17" 16.1"
February -6° -29.4° (1949) 22.2° (1986) 3.87" 12.8"
March -3° -24.4° (1952) 26.7° (1966) 3.61" 10.2"
April -2° 14° -15.6° (1975) 29.4° (1981) 1.23" 4"
May 19° -10.6° (1950) 34.4° (2003) 1.12" 1.1"
June 24° -6.7° (2002) 43.9° (2006) 0.54" 0"
July 29° -5.6° (1976) 39.4° (2002) 0.34" 0"
August 29° -5° (1960) 41.7° (1981) 0.43" 0"
September 24° -10° (1950) 37.8° (1955) 0.78" 0.1"
October -2° 18° -12.8° (1971) 33.3° (1980) 1.22" 0.2"
November -5° 10° -17.8° (1975) 24.4° (1949) 2.5" 5.6"
December -8° -33.3° (1972) 21.1° (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 3.3° 26.7° -2° (1951) 37° (1955) 0.02" NA
Sep 2 3.3° 26.7° -5° (1964) 38° (1955) 0.02" NA
Sep 3 3.3° 26.7° -3° (1964) 37° (1955) 0.02" NA
Sep 4 2.8° 26.7° -3° (1961) 37° (1955) 0.02" NA
Sep 5 2.8° 26.1° -3° (1954) 37° (1955) 0.02" NA
Sep 6 2.8° 26.1° -4° (1964) 34° (1955) 0.02" NA
Sep 7 2.8° 26.1° -3° (1964) 35° (1957) 0.02" NA
Sep 8 2.8° 26.1° -3° (1952) 34° (1957) 0.02" NA
Sep 9 2.8° 25.6° -3° (1961) 34° (1957) 0.02" NA
Sep 10 2.2° 25.6° -4° (1952) 34° (1948) 0.02" NA
Sep 11 2.2° 25.6° -3° (1961) 34° (1953) 0.02" NA
Sep 12 2.2° 25.6° -4° (1972) 33° (1979) 0.02" NA
Sep 13 2.2° 25° -3° (1954) 33° (1953) 0.03" NA
Sep 14 2.2° 25° -6° (1970) 34° (1971) 0.03" NA
Sep 15 1.7° 25° -4° (1970) 35° (1979) 0.03" NA
Sep 16 1.7° 24.4° -4.4° (2006) 34° (1979) 0.03" NA
Sep 17 1.7° 24.4° -4° (1965) 33° (1962) 0.03" NA
Sep 18 1.7° 24.4° -8° (1965) 33° (1974) 0.03" NA
Sep 19 1.7° 23.9° -6° (1954) 33° (1974) 0.03" NA
Sep 20 1.1° 23.9° -4° (1968) 33° (1974) 0.03" NA
Sep 21 1.1° 23.9° -6° (1968) 35° (1992) 0.03" NA
Sep 22 1.1° 23.9° -6° (1960) 33° (1949) 0.03" NA
Sep 23 1.1° 23.3° -4° (1971) 32° (1974) 0.03" NA
Sep 24 0.6° 23.3° -4° (1993) 32° (1974) 0.03" NA
Sep 25 0.6° 23.3° -6° (1948) 32° (1974) 0.03" NA
Sep 26 0.6° 22.8° -6° (1955) 32° (1963) 0.03" NA
Sep 27 0.6° 22.8° -4° (1948) 31° (1963) 0.03" NA
Sep 28 0.6° 22.8° -6° (1959) 32° (2003) 0.03" NA
Sep 29 22.2° -7° (1971) 32° (1980) 0.03" NA
Sep 30 22.2° -10° (1950) 33° (1980) 0.03" NA
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