ERA5 almanac — 8 years of real data

Bozeman in June

Bozeman in June: 28% of days see measurable rain, 72°F average high, 38% of days historically clear (n=240, ERA5 2018–2025).

Bozeman in June is historically a poor month for sun: only 38% of days clear across 8 years (n=240, avg high 72°F). 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 Bozeman 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 Bozeman 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	40%	n=120	72°F
Late June 16th–end	37%	n=120	72°F
Full month average	38%	n=240	72°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 Bozeman 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	54%	n=120
Late June 16th–end	52%	n=120
Full month average	53%	n=240

14.3 h median sunshine per day 90% of days exceed 8 h sunshine 28% of days see ≥ 1 mm rain — rain is not hidden

Comparison (old vs new): WMO-code “clear” bar: 38%. Sunshine-based “warm & sunny”: 53%. The 15-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

Bozeman is mostly overcast in June historically: only 38% of days are clear across 8 years (n=240), avg high 72°F. Most visitors this month will see more clouds than sun.

Every month in Bozeman

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

Historical clear-sky % for Bozeman, 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	0%	n=240	All destinations →
May	8%	n=248	All destinations →
June ← this page	38%	n=240	All destinations →
July	72%	n=248	All destinations →
August	67%	n=248	All destinations →
September	48%	n=240	All destinations →
October	5%	n=248	All destinations →
November	0%	n=240	All destinations →
December	0%	n=248	All destinations →

Frequently asked

Does it rain in Bozeman in June?

Sometimes. Bozeman sees measurable rain on 28% of days in June historically (n=240 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Bozeman good for sun in June?

It's mixed. Bozeman in June is clear on 38% of days historically (avg high 72°F, n=240 days, ERA5 2018–2025) — the outcome varies year to year.

How Bozeman compares in June

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

→ Bozeman vs Dallas in June — Dallas is 38% clear historically
→ Bozeman vs Hudson Valley in June — Hudson Valley is 38% clear historically
→ Bozeman vs Memphis in June — Memphis is 38% clear historically

→ Bozeman live forecast — this week’s actual 7-day weather, not historical
→ Best destinations in June — all destinations ranked by June clear-sky %
→ All destinations
→ Raw data (JSON) — buckets, n, source

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.