ERA5 almanac — 8 years of real data

Bozeman in July

Bozeman in July: 10% of days see measurable rain, 82°F average high, 72% of days historically clear (n=248, ERA5 2018–2025).

Historically one of the better months to visit Bozeman for sun: 72% of days are clear on average (n=248, avg high 82°F). Every percentage here is a historical average from 8 years of ERA5 data — 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 July

Clear-sky percentage for Bozeman in July, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period	% Clear days	Sample (n)	Avg high
Early July 1st–15th	64%	n=120	82°F
Late July 16th–end	80%	n=128	82°F
Full month average	72%	n=248	82°F

Sunshine & warmth in July

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 July. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period	Warm & sunny (≥72°F, >6 h sun)	Sample (n)
Early July 1st–15th	86%	n=120
Late July 16th–end	99%	n=128
Full month average	93%	n=248

14.8 h median sunshine per day 99% of days exceed 8 h sunshine 10% of days see ≥ 1 mm rain — rain is not hidden

Comparison (old vs new): WMO-code “clear” bar: 72%. Sunshine-based “warm & sunny”: 93%. The 21-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 clears solidly in July: 72% of days historically (n=248), avg high 82°F. Most trips here in July will find more sun than cloud.

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	38%	n=240	All destinations →
July ← this page	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 July?

Rarely. Only 10% of days in Bozeman see measurable rain in July, based on 8 years of ERA5 historical data (n=248 days, 2018–2025). This is a historical average, not a forecast.

Is Bozeman good for sun in July?

Yes. Bozeman is historically strong for sun in July: 72% of days are clear on average (avg high 82°F, n=248 days, ERA5 2018–2025).

How Bozeman compares in July

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 Newport Beach in July — Newport Beach is 71% clear historically
→ Bozeman vs Whitefish in July — Whitefish is 71% clear historically
→ Bozeman vs Seattle in July — Seattle is 70% clear historically

→ Bozeman live forecast — this week’s actual 7-day weather, not historical
→ Best destinations in July — all destinations ranked by July 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.