ERA5 almanac — 8 years of real data

Montréal in June

Montréal in June: 40% of days see measurable rain, 76°F average high, 31% of days historically clear (n=240, ERA5 2018–2025).

Montréal in June is historically a poor month for sun: only 31% of days clear across 8 years (n=240, avg high 76°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 Montréal 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 Montréal 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	27%	n=120	76°F
Late June 16th–end	35%	n=120	76°F
Full month average	31%	n=240	76°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 Montréal 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	53%	n=120
Late June 16th–end	75%	n=120
Full month average	64%	n=240

12.1 h median sunshine per day 77% of days exceed 8 h sunshine 40% of days see ≥ 1 mm rain — rain is not hidden

Comparison (old vs new): WMO-code “clear” bar: 31%. Sunshine-based “warm & sunny”: 64%. The 33-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

Montréal is mostly overcast in June historically: only 31% of days are clear across 8 years (n=240), avg high 76°F. Most visitors this month will see more clouds than sun.

Every month in Montréal

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

Historical clear-sky % for Montréal, 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	2%	n=240	All destinations →
May	17%	n=248	All destinations →
June ← this page	31%	n=240	All destinations →
July	35%	n=248	All destinations →
August	31%	n=248	All destinations →
September	22%	n=240	All destinations →
October	4%	n=248	All destinations →
November	0%	n=240	All destinations →
December	0%	n=248	All destinations →

Frequently asked

Does it rain in Montréal in June?

Sometimes. Montréal sees measurable rain on 40% of days in June historically (n=240 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Montréal good for sun in June?

It's mixed. Montréal in June is clear on 31% of days historically (avg high 76°F, n=240 days, ERA5 2018–2025) — the outcome varies year to year.

How Montréal compares in June

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

→ Montréal vs San Antonio in June — San Antonio is 31% clear historically
→ Montréal vs Asheville in June — Asheville is 30% clear historically
→ Montréal vs Austin in June — Austin is 32% clear historically

→ Montréal 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.