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SunnyDays

ERA5 almanac — 8 years of real data

Missoula in June

Missoula in June: 26% of days see measurable rain, 76°F average high, 44% of days historically clear (n=240, ERA5 2018–2025).

Missoula in June is a mixed month for sun: 44% of days historically clear (n=240, avg high 76°F). The outcome varies year to year — check the early/late split below. 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 Missoula 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 June

Clear-sky percentage for Missoula in June, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early June
1st–15th		 43% n=120 76°F
Late June
16th–end		 45% n=120 76°F
Full month average 44% n=240 76°F

Sunshine & warmth in June

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 Missoula in June. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early June
1st–15th		 64% n=120
Late June
16th–end		 72% n=120
Full month average 68% n=240
14.3 h median sunshine per day 90% of days exceed 8 h sunshine 26% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 44%. Sunshine-based “warm & sunny”: 68%. The 24-point gap is from brief afternoon convective storms that stamp the whole day as “rain” in the WMO code but leave the bulk of the sunshine untouched.

Bottom line

Missoula in June is genuinely mixed: 44% of days historically clear (n=240), avg high 76°F — more cloudy than clear. The outcome varies year to year; don't book if you need guaranteed sun.

Every month in Missoula

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

Historical clear-sky % for Missoula, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 0% n=248 All destinations →
February 0% n=226 All destinations →
March 0% n=248 All destinations →
April 4% n=240 All destinations →
May 22% n=248 All destinations →
June ← this page 44% n=240 All destinations →
July 82% n=248 All destinations →
August 74% n=248 All destinations →
September 57% n=240 All destinations →
October 14% n=248 All destinations →
November 0% n=240 All destinations →
December 0% n=248 All destinations →

Frequently asked

Does it rain in Missoula in June?

Sometimes. Missoula sees measurable rain on 26% of days in June historically (n=240 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Missoula good for sun in June?

It's mixed. Missoula in June is clear on 44% of days historically (avg high 76°F, n=240 days, ERA5 2018–2025) — the outcome varies year to year.

How Missoula compares in June

Head-to-head clear-sky comparisons against destinations travelers plausibly weigh against Missoula this month — same passport tier, similar flight distance, both sides from the same 8-year ERA5 record.

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.