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SunnyDays

ERA5 almanac — 8 years of real data

Asheville in June

Asheville in June is historically a poor month for sun: only 30% of days clear across 8 years (n=240, avg high 81°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 Asheville 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 Asheville 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		 32% n=120 81°F
Late June
16th–end		 28% n=120 81°F
Full month average 30% n=240 81°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 Asheville 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		 93% n=120
Late June
16th–end		 93% n=120
Full month average 93% n=240
13.0 h median sunshine per day 92% of days exceed 8 h sunshine 43% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 30%. Sunshine-based “warm & sunny”: 93%. The 63-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

Asheville is mostly overcast in June historically: only 30% of days are clear across 8 years (n=240), avg high 81°F. Most visitors this month will see more clouds than sun.

Every month in Asheville

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

Historical clear-sky % for Asheville, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 0% n=248 All destinations →
February 1% n=226 All destinations →
March 3% n=248 All destinations →
April 19% n=240 All destinations →
May 26% n=248 All destinations →
June ← this page 30% n=240 All destinations →
July 21% n=248 All destinations →
August 25% n=248 All destinations →
September 40% n=240 All destinations →
October 23% n=248 All destinations →
November 4% n=240 All destinations →
December 0% n=248 All destinations →

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.