Weather in St. Helena, CA
St. Helena, Thursday, 12 November, 23:38
Overcast. Feels like 60°. High 71°, low 47°.
Monthly outlook for St. Helena, CA: average high 58.2°, average low 41.9°. That is 2.7° below the climate normal for November. Precipitation is expected on 5 days (about 3.5 inches), against a normal of 4 days and 1.9 inches. The warmest day looks like 12 November (70.7°), the coolest 14 November (37.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 12 November – 21 November | 57° | 63.8° | -3.8° |
| 22 November – 1 December | 60.2° | 61.4° | -0.7° |
| 2 December – 11 December | at normal | 59.3° | — |
November records over 66 years
0.94
St. Helena, Friday, 13 November
Heavy rain. High 61°, low 41°.
0St. Helena, Saturday, 14 November
Light rain. High 61°, low 37°.
0.43St. Helena, Sunday, 15 November
Rain. High 55°, low 44°.
0.01St. Helena, Monday, 16 November
Light rain. High 58°, low 40°.
0St. Helena, Tuesday, 17 November
Light rain. High 57°, low 37°.
1.87St. Helena, Wednesday, 18 November
Heavy rain. High 49°, low 44°.
0.16St. Helena, Thursday, 19 November
Light rain. High 54°, low 42°.
0
St. Helena, Friday, 20 November
Partly cloudy. High 52°, low 39°.
0
St. Helena, Saturday, 21 November
Clear. High 53°, low 38°.
0St. Helena, Sunday, 22 November
Clear. High 57°, low 38°.
0St. Helena, Monday, 23 November
Clear. High 59°, low 40°.
0St. Helena, Tuesday, 24 November
Overcast. High 56°, low 42°.
0St. Helena, Wednesday, 25 November
Overcast. High 62°, low 43°.
0.06St. Helena, Thursday, 26 November
Light rain. High 61°, low 50°.
0St. Helena, Friday, 27 November
Overcast. High 65°, low 47°.
0.13St. Helena, Saturday, 28 November
Climate normal for this date — 60-year average.
0.17St. Helena, Sunday, 29 November
Climate normal for this date — 60-year average.
0.19St. Helena, Monday, 30 November
Climate normal for this date — 60-year average.
0.17St. Helena, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.25St. Helena, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.26
St. Helena, Thursday, 3 December
Climate normal for this date — 60-year average.
0.11St. Helena, Friday, 4 December
Climate normal for this date — 60-year average.
0.12St. Helena, Saturday, 5 December
Climate normal for this date — 60-year average.
0.14St. Helena, Sunday, 6 December
Climate normal for this date — 60-year average.
0.13St. Helena, Monday, 7 December
Climate normal for this date — 60-year average.
0.13St. Helena, Tuesday, 8 December
Climate normal for this date — 60-year average.
0.14St. Helena, Wednesday, 9 December
Climate normal for this date — 60-year average.
0.16St. Helena, Thursday, 10 December
Climate normal for this date — 60-year average.
0.19St. Helena, Friday, 11 December
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for St. Helena, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in St. Helena, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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