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SunnyDays

ERA5 almanac — 8 years of real data

Mérida in March

Mérida in March: 10% of days see measurable rain, 92°F average high, 74% of days historically clear (n=248, ERA5 2018–2025).

Historically one of the better months to visit Mérida for sun: 74% of days are clear on average (n=248, avg high 92°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 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 March

Clear-sky percentage for Mérida in March, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early March
1st–15th		 73% n=120 92°F
Late March
16th–end		 74% n=128 92°F
Full month average 74% n=248 92°F

Sunshine & warmth in March

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 March. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early March
1st–15th		 98% n=120
Late March
16th–end		 98% n=128
Full month average 98% n=248
11.8 h median sunshine per day 97% of days exceed 8 h sunshine 10% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 74%. Sunshine-based “warm & sunny”: 98%. The 24-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 March: 74% of days historically (n=248), avg high 92°F. Most trips here in March 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 ← this page 74% n=248 All destinations →
April 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 March?

Rarely. Only 10% of days in Mérida see measurable rain in March, based on 8 years of ERA5 historical data (n=248 days, 2018–2025). This is a historical average, not a forecast.

Is Mérida good for sun in March?

Yes. Mérida is historically strong for sun in March: 74% of days are clear on average (avg high 92°F, n=248 days, ERA5 2018–2025).

How Mérida compares in March

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.

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.