ERA5 almanac — 8 years of real data

Mérida in April

Mérida in April: 12% of days see measurable rain, 96°F average high, 68% of days historically clear (n=240, ERA5 2018–2025).

Mérida in April is a mixed month for sun: 68% of days historically clear (n=240, avg high 96°F). The outcome varies year to year — check the early/late split below. 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 Mérida 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 April

Clear-sky percentage for Mérida in April, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period	% Clear days	Sample (n)	Avg high
Early April 1st–15th	75%	n=120	96°F
Late April 16th–end	61%	n=120	96°F
Full month average	68%	n=240	96°F

Sunshine & warmth in April

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 Mérida in April. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period	Warm & sunny (≥72°F, >6 h sun)	Sample (n)
Early April 1st–15th	99%	n=120
Late April 16th–end	100%	n=120
Full month average	100%	n=240

12.0 h median sunshine per day 99% of days exceed 8 h sunshine 12% of days see ≥ 1 mm rain — rain is not hidden

Comparison (old vs new): WMO-code “clear” bar: 68%. Sunshine-based “warm & sunny”: 100%. The 32-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

Mérida clears solidly in April: 68% of days historically (n=240), avg high 96°F. Most trips here in April will find more sun than cloud.

Every month in Mérida

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

Historical clear-sky % for Mérida, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January	55%	n=248	All destinations →
February	61%	n=226	All destinations →
March	74%	n=248	All destinations →
April ← this page	68%	n=240	All destinations →
May	47%	n=248	All destinations →
June	20%	n=240	All destinations →
July	20%	n=248	All destinations →
August	13%	n=248	All destinations →
September	8%	n=240	All destinations →
October	20%	n=248	All destinations →
November	38%	n=240	All destinations →
December	53%	n=248	All destinations →

Frequently asked

Does it rain in Mérida in April?

Rarely. Only 12% of days in Mérida see measurable rain in April, based on 8 years of ERA5 historical data (n=240 days, 2018–2025). This is a historical average, not a forecast.

Is Mérida good for sun in April?

Yes. Mérida is historically strong for sun in April: 68% of days are clear on average (avg high 96°F, n=240 days, ERA5 2018–2025).

How Mérida compares in April

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

→ Mérida vs Huatulco in April — Huatulco is 67% clear historically
→ Mérida vs Oaxaca in April — Oaxaca is 70% clear historically
→ Mérida vs Los Angeles in April — Los Angeles is 60% clear historically

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