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
May 1 -0.6° 16.1° -7° (1967) 30° (1949) 0.03" NA
May 2 -0.6° 16.1° -8° (1964) 27° (1966) 0.03" NA
May 3 -0.6° 16.7° -11° (1950) 27° (2004) 0.03" NA
May 4 -0.6° 16.7° -8.9° (2007) 27° (2004) 0.03" NA
May 5 16.7° -6° (1961) 27° (1992) 0.03" NA
May 6 17.2° -8° (1964) 29° (1954) 0.04" NA
May 7 17.2° -6° (1950) 29° (1992) 0.04" NA
May 8 17.2° -7° (1950) 33° (1949) 0.04" NA
May 9 17.8° -6° (1950) 28° (2001) 0.04" NA
May 10 0.6° 17.8° -6° (1972) 27° (1969) 0.04" NA
May 11 0.6° 17.8° -8° (2000) 28° (1988) 0.04" NA
May 12 0.6° 17.8° -7° (1953) 28° (1976) 0.04" NA
May 13 0.6° 18.3° -6° (1961) 31° (1976) 0.04" NA
May 14 0.6° 18.3° -7° (1968) 29° (1973) 0.04" NA
May 15 0.6° 18.9° -6° (1968) 28.9° (2006) 0.04" NA
May 16 1.1° 18.9° -4° (1961) 31.1° (2006) 0.04" NA
May 17 1.1° 18.9° -4° (1974) 31° (1954) 0.04" NA
May 18 1.1° 18.9° -8° (1974) 32° (1954) 0.04" NA
May 19 1.1° 19.4° -7° (1976) 32° (1954) 0.04" NA
May 20 1.1° 19.4° -6° (1976) 29° (1954) 0.04" NA
May 21 1.7° 19.4° -7° (2002) 30° (1967) 0.04" NA
May 22 1.7° 20° -7° (1960) 32° (1949) 0.04" NA
May 23 1.7° 20° -6° (1976) 31° (2001) 0.04" NA
May 24 1.7° 20° -6° (1976) 31° (2000) 0.04" NA
May 25 1.7° 20.6° -4° (1953) 32° (1982) 0.03" NA
May 26 1.7° 20.6° -4° (1977) 31° (1951) 0.03" NA
May 27 2.2° 20.6° -6° (1961) 32° (1983) 0.03" NA
May 28 2.2° 20.6° -4° (1976) 33° (1984) 0.03" NA
May 29 2.2° 21.1° -6° (1976) 34° (2003) 0.03" NA
May 30 2.2° 21.1° -3° (1988) 32° (1950) 0.03" NA
May 31 2.2° 21.1° -3° (1966) 32° (1950) 0.03" NA
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