ERA5 almanac — 8 years of real data

Aspen in June

Aspen in June: 26% of days see measurable rain, 74°F average high, 34% of days historically clear (n=240, ERA5 2018–2025).

Aspen in June is historically a poor month for sun: only 34% of days clear across 8 years (n=240, avg high 74°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 Aspen 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 Aspen 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	33%	n=120	74°F
Late June 16th–end	35%	n=120	74°F
Full month average	34%	n=240	74°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 Aspen 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	52%	n=120
Late June 16th–end	73%	n=120
Full month average	62%	n=240

14.1 h median sunshine per day 98% 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: 34%. Sunshine-based “warm & sunny”: 62%. The 28-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

Aspen is mostly overcast in June historically: only 34% of days are clear across 8 years (n=240), avg high 74°F. Most visitors this month will see more clouds than sun.

Every month in Aspen

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

Historical clear-sky % for Aspen, 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	3%	n=248	All destinations →
June ← this page	34%	n=240	All destinations →
July	43%	n=248	All destinations →
August	47%	n=248	All destinations →
September	39%	n=240	All destinations →
October	2%	n=248	All destinations →
November	0%	n=240	All destinations →
December	0%	n=248	All destinations →

Frequently asked

Does it rain in Aspen in June?

Sometimes. Aspen 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 Aspen good for sun in June?

It's mixed. Aspen in June is clear on 34% of days historically (avg high 74°F, n=240 days, ERA5 2018–2025) — the outcome varies year to year.

How Aspen compares in June

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

→ Aspen vs Boston in June — Boston is 33% clear historically
→ Aspen vs Sun Valley in June — Sun Valley is 33% clear historically
→ Aspen vs Albany in June — Albany is 36% clear historically

→ Aspen 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.