ERA5 almanac — 8 years of real data

Wine Country Sonoma in June

Wine Country Sonoma in June: 0% of days see measurable rain, 82°F average high, 90% of days historically clear (n=240, ERA5 2018–2025).

Historically one of the better months to visit Wine Country Sonoma for sun: 90% of days are clear on average (n=240, 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 Wine Country Sonoma 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 Wine Country Sonoma 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	85%	n=120	82°F
Late June 16th–end	95%	n=120	82°F
Full month average	90%	n=240	82°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 Wine Country Sonoma 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	84%	n=120
Late June 16th–end	96%	n=120
Full month average	90%	n=240

14.1 h median sunshine per day 98% of days exceed 8 h sunshine 0% of days see ≥ 1 mm rain — rain is not hidden

Comparison (old vs new): WMO-code “clear” bar: 90%. Sunshine-based “warm & sunny”: 90%. The two measures are nearly identical here — no convective-storm bias for this climate and month.

Bottom line

Wine Country Sonoma is historically one of the best destinations for sun in June: 90% of days meet the clear bar (avg high 82°F, n=240 days across 8 years). Pack for outdoor activity — this month consistently delivers.

Every month in Wine Country Sonoma

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

Historical clear-sky % for Wine Country Sonoma, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January	1%	n=248	All destinations →
February	8%	n=226	All destinations →
March	8%	n=248	All destinations →
April	32%	n=240	All destinations →
May	61%	n=248	All destinations →
June ← this page	90%	n=240	All destinations →
July	96%	n=248	All destinations →
August	95%	n=248	All destinations →
September	86%	n=240	All destinations →
October	68%	n=248	All destinations →
November	16%	n=240	All destinations →
December	0%	n=248	All destinations →

Frequently asked

Does it rain in Wine Country Sonoma in June?

Rarely. Only 0% of days in Wine Country Sonoma see measurable rain in June, based on 8 years of ERA5 historical data (n=240 days, 2018–2025). This is a historical average, not a forecast.

Is Wine Country Sonoma good for sun in June?

Yes. Wine Country Sonoma is historically strong for sun in June: 90% of days are clear on average (avg high 82°F, n=240 days, ERA5 2018–2025).

How Wine Country Sonoma compares in June

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

→ Wine Country Sonoma vs Sonoma in June — Sonoma is 90% clear historically
→ Wine Country Sonoma vs Tucson in June — Tucson is 89% clear historically
→ Wine Country Sonoma vs Los Angeles in June — Los Angeles is 88% clear historically

→ Wine Country Sonoma 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.