Portola, California
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 19° 42° -22° (1971) 66° (1961) 4.06" 10.1"
February 21° 45° -21° (1949) 72° (1986) 4.03" 11.8"
March 25° 51° -12° (1952) 80° (1966) 3.36" 5.6"
April 29° 57° 4° (1975) 85° (1981) 1.37" 2.7"
May 35° 67° 13° (1950) 94° (2003) 0.96" 0.3"
June 40° 76° 20° (2002) 111° (2006) 0.52" 0.1"
July 44° 85° 22° (1976) 103° (2002) 0.28" 0"
August 42° 84° 23° (1960) 107° (1981) 0.28" 0"
September 37° 77° 14° (1950) 100° (1955) 0.6" 0"
October 30° 66° 9° (1971) 92° (1980) 1.27" 0.3"
November 24° 51° 0° (1975) 76° (1949) 2.59" 4.3"
December 19° 42° -28° (1972) 70° (1958) 4.09" 7.8"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 21° 44° 9° (1965) 62° (1958) 0.12" 0.3"
Dec 2 21° 44° 2° (1967) 68° (1958) 0.11" 0.2"
Dec 3 21° 43° -2° (1952) 70° (1958) 0.12" 0.3"
Dec 4 21° 43° 4° (1948) 66° (1958) 0.12" 0.2"
Dec 5 20° 43° 2° (1998) 62° (1958) 0.12" 0.3"
Dec 6 20° 43° 0° (1951) 61° (1958) 0.12" 0.2"
Dec 7 20° 42° -3° (1956) 62° (1958) 0.12" 0.3"
Dec 8 20° 42° -14° (2009) 60° (1981) 0.13" 0.2"
Dec 9 20° 42° -28° (1972) 60° (1979) 0.12" 0.2"
Dec 10 20° 42° 4° (1994) 68° (1950) 0.13" 0.3"
Dec 11 19° 42° -1° (1949) 65° (1950) 0.12" 0.3"
Dec 12 19° 41° -2° (1949) 58° (1958) 0.12" 0.2"
Dec 13 19° 41° 5° (1959) 59° (1988) 0.13" 0.2"
Dec 14 19° 41° -2° (1959) 59° (1962) 0.12" 0.2"
Dec 15 19° 41° 0° (1948) 56° (1952) 0.13" 0.3"
Dec 16 19° 41° -5° (1948) 65° (1958) 0.13" 0.2"
Dec 17 19° 41° -3° (1984) 63° (1958) 0.13" 0.3"
Dec 18 19° 41° -8° (1992) 67° (1958) 0.14" 0.2"
Dec 19 19° 41° -6° (1992) 60° (1958) 0.15" 0.2"
Dec 20 19° 41° -12° (1949) 55° (1980) 0.15" 0.3"
Dec 21 19° 41° -13° (1990) 60° (1955) 0.15" 0.2"
Dec 22 19° 41° -23° (1990) 53° (1960) 0.14" 0.3"
Dec 23 19° 41° -14° (1990) 53° (1954) 0.15" 0.3"
Dec 24 19° 41° -11° (1990) 58° (1961) 0.14" 0.2"
Dec 25 18° 41° -7° (1990) 53° (1950) 0.15" 0.3"
Dec 26 18° 41° -11° (1988) 62° (1980) 0.14" 0.3"
Dec 27 18° 41° -11° (1988) 58° (1980) 0.14" 0.3"
Dec 28 18° 41° 0° (1990) 57° (1980) 0.14" 0.3"
Dec 29 18° 41° -4° (1974) 57° (1962) 0.14" 0.2"
Dec 30 18° 41° -4° (1990) 61° (1963) 0.13" 0.3"
Dec 31 18° 41° -15° (1951) 59° (1963) 0.14" 0.2"
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