St. Helena December Weather

Averages and records for weather in St. Helena, California in the month of December.
Typical St. Helena December Weather
1991–2020
Average daily high 58.1 °F
Average daily low 39.1 °F
Average monthly precipitation 7.6 inches
Average monthly snow none
Daily chance of precipitation 38.5%
Daily chance of snow 0%
St. Helena December Weather Records
1907–2023
Highest temperature 83 °F December 27, 1967
Lowest temperature 11 °F December 11, 1932
Highest daily low 58 °F December 31, 2020
Lowest daily high 34 °F December 11, 1932
Hottest average high temperature 67.7 °F 1958
Coldest average high temperature 49.8 °F 1924
Most daily precipitation 7.0 inches December 30, 1913
Most monthly precipitation 24.3 inches 1955
Most daily snow 1.8 inches December 25, 1948
Most monthly snow 1.8 inches 1948
Note: Daily averages are a moving average which includes 14 days before and after
Day Average (°F) Record (°F)
High Low High Low
December 1 61.0 41.0 79 19
December 2 60.7 40.8 77 25
December 3 60.4 40.7 80 22
December 4 60.2 40.5 77 21
December 5 60.1 40.3 80 22
December 6 59.8 40.1 80 24
December 7 59.6 40.0 75 21
December 8 59.4 39.9 76 21
December 9 59.2 39.8 76 17
December 10 59.1 39.6 77 15
December 11 58.9 39.5 78 11
December 12 58.7 39.3 82 23
December 13 58.6 39.2 75 20
December 14 58.4 39.2 77 18
December 15 58.3 39.2 81 18
December 16 58.2 39.2 76 21
December 17 58.1 39.2 81 20
December 18 58.0 39.1 75 20
December 19 58.0 39.0 71 18
December 20 57.9 38.9 70 22
December 21 57.9 38.8 70 14
December 22 57.9 38.7 73 16
December 23 57.8 38.6 74 20
December 24 57.8 38.5 75 18
December 25 57.7 38.5 76 21
December 26 57.6 38.6 79 20
December 27 57.6 38.5 83 23
December 28 57.7 38.5 77 22
December 29 57.8 38.5 74 22
December 30 57.9 38.6 74 21
December 31 57.9 38.7 70 21
Weather Station Details
Years Station Coordinates
1907–2023 Saint Helena location