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SunnyDays

ERA5 almanac — 8 years of real data

Coeur d'Alene in December

Coeur d'Alene in December: 55% of days see measurable rain, 38°F average high, 0% of days historically clear (n=248, ERA5 2018–2025).

Coeur d'Alene in December is historically a poor month for sun: only 0% of days clear across 8 years (n=248, avg high 38°F). July is the clearest month for Coeur d'Alene historically. Historical average, not a forecast.

What you are reading: 8-year historical averages from the ERA5 reanalysis, not a forecast. A month that is historically 90% clear can still be overcast on your specific trip. For this week’s actual forecast, see the live Coeur d'Alene page. Both can be true at once: “historically strong in this month; this particular week is not.” We label which is which.

Early vs. Late December

Clear-sky percentage for Coeur d'Alene in December, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early December
1st–15th		 0% n=120 38°F
Late December
16th–end		 0% n=128 38°F
Full month average 0% n=248 38°F

Sunshine & warmth in December

A second measure using actual sunshine hours (ERA5 sunshine_duration), not the daily weather code. A Lowcountry day with 12 hours of sun and a 25-minute afternoon storm is counted below as a warm, sunny day — because it was. How we define this.

Sunshine-based metrics for Coeur d'Alene in December. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early December
1st–15th		 0% n=120
Late December
16th–end		 0% n=128
Full month average 0% n=248
3.1 h median sunshine per day 4% of days exceed 8 h sunshine 55% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 0%. Sunshine-based “warm & sunny”: 0%. The two measures are nearly identical here — no convective-storm bias for this climate and month.

Bottom line

Coeur d'Alene is historically almost never clear in December: only 0% of days meet the clear bar across 8 years (n=248). Come back in July if you want clear skies here. Plan entirely around indoor or overcast-friendly activities.

→ See all destinations in July — historically the best month for sun in Coeur d'Alene.

Every month in Coeur d'Alene

Compare across all months with data. Numbers are historical clear-sky %.

Historical clear-sky % for Coeur d'Alene, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 0% n=248 All destinations →
February 0% n=226 All destinations →
March 1% n=248 All destinations →
April 2% n=240 All destinations →
May 20% n=248 All destinations →
June 44% n=240 All destinations →
July 82% n=248 All destinations →
August 75% n=248 All destinations →
September 50% n=240 All destinations →
October 10% n=248 All destinations →
November 0% n=240 All destinations →
December ← this page 0% n=248 All destinations →

Frequently asked

Does it rain in Coeur d'Alene in December?

Yes, frequently. In Coeur d'Alene, 55% of days in December see measurable rain, based on 8 years of ERA5 historical data (n=248 days, 2018–2025). This is a historical average, not a forecast.

Is Coeur d'Alene good for sun in December?

Not usually. Coeur d'Alene is historically overcast in December: only 0% of days are clear (avg high 38°F, n=248 days, ERA5 2018–2025). July is historically far better for sun here.

All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.