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
Dec 1 -6.7° 6.7° -13° (1965) 17° (1958) 0.1" NA
Dec 2 -6.7° 6.7° -17° (1967) 20° (1958) 0.1" NA
Dec 3 -6.7° 6.7° -19° (1952) 21° (1958) 0.1" NA
Dec 4 -7.2° 6.1° -16° (1948) 19° (1958) 0.1" NA
Dec 5 -7.2° 6.1° -17° (1998) 17° (1958) 0.1" NA
Dec 6 -7.2° 6.1° -18° (1951) 16° (1958) 0.1" NA
Dec 7 -7.2° 6.1° -19° (1956) 17° (1958) 0.1" NA
Dec 8 -7.2° 6.1° -23° (1972) 16° (1981) 0.1" NA
Dec 9 -7.2° 6.1° -33° (1972) 16° (1979) 0.1" NA
Dec 10 -7.2° 5.6° -16° (1994) 20° (1950) 0.1" NA
Dec 11 -7.2° 5.6° -18° (1949) 18° (1950) 0.1" NA
Dec 12 -7.8° 5.6° -19° (1949) 14° (1958) 0.1" NA
Dec 13 -7.8° 5.6° -15° (1959) 15° (1988) 0.1" NA
Dec 14 -7.8° 5.6° -19° (1959) 15° (1962) 0.1" NA
Dec 15 -7.8° 5.6° -18° (1948) 13° (1952) 0.1" NA
Dec 16 -7.8° -21° (1948) 18° (1958) 0.1" NA
Dec 17 -7.8° -19° (1984) 17° (1958) 0.1" NA
Dec 18 -7.8° -22° (1992) 19° (1958) 0.11" NA
Dec 19 -7.8° -21° (1992) 16° (1958) 0.11" NA
Dec 20 -7.8° -24° (1949) 13° (1980) 0.11" NA
Dec 21 -7.8° -25° (1990) 16° (1955) 0.11" NA
Dec 22 -7.8° -31° (1990) 12° (1960) 0.11" NA
Dec 23 -7.8° -26° (1990) 12° (1954) 0.11" NA
Dec 24 -8.3° 4.4° -24° (1990) 14° (1961) 0.11" NA
Dec 25 -8.3° 4.4° -22° (1990) 12° (1950) 0.11" NA
Dec 26 -8.3° 4.4° -24° (1988) 17° (1980) 0.11" NA
Dec 27 -8.3° 4.4° -24° (1988) 14° (1980) 0.11" NA
Dec 28 -8.3° 4.4° -18° (1990) 14° (1980) 0.12" NA
Dec 29 -8.3° 4.4° -20° (1974) 14° (1962) 0.12" NA
Dec 30 -8.3° 4.4° -20° (1990) 16° (1963) 0.12" NA
Dec 31 -8.3° 4.4° -26° (1951) 15° (1963) 0.12" NA
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