ERA5 almanac — 8 years of real data

St. John, USVI in February

St. John, USVI in February: 49% of days see measurable rain, 75°F average high, 13% of days historically clear (n=226, ERA5 2018–2025).

St. John, USVI in February is historically a poor month for sun: only 13% of days clear across 8 years (n=226, avg high 75°F). March is the clearest month for St. John, USVI historically. 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 St. John, USVI 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 February

Clear-sky percentage for St. John, USVI in February, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period	% Clear days	Sample (n)	Avg high
Early February 1st–15th	8%	n=120	75°F
Late February 16th–end	18%	n=106	75°F
Full month average	13%	n=226	75°F

Sunshine & warmth in February

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 St. John, USVI in February. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period	Warm & sunny (≥72°F, >6 h sun)	Sample (n)
Early February 1st–15th	97%	n=120
Late February 16th–end	100%	n=106
Full month average	98%	n=226

11.0 h median sunshine per day 98% of days exceed 8 h sunshine 49% of days see ≥ 1 mm rain — rain is not hidden

Comparison (old vs new): WMO-code “clear” bar: 13%. Sunshine-based “warm & sunny”: 98%. The 85-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

St. John, USVI is a poor choice for sun in February: just 13% of days clear historically (n=226). March is the historically strongest month for sun here. The 8-year record is consistent — this is not a fluke bad stretch.

→ See all destinations in March — historically the best month for sun in St. John, USVI.

Every month in St. John, USVI

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

Historical clear-sky % for St. John, USVI, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January	18%	n=248	All destinations →
February ← this page	13%	n=226	All destinations →
March	28%	n=248	All destinations →
April	20%	n=240	All destinations →
May	25%	n=248	All destinations →
June	20%	n=240	All destinations →
July	9%	n=248	All destinations →
August	13%	n=248	All destinations →
September	15%	n=240	All destinations →
October	15%	n=248	All destinations →
November	18%	n=240	All destinations →
December	16%	n=248	All destinations →

Frequently asked

Does it rain in St. John, USVI in February?

Sometimes. St. John, USVI sees measurable rain on 49% of days in February historically (n=226 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is St. John, USVI good for sun in February?

Not usually. St. John, USVI is historically overcast in February: only 13% of days are clear (avg high 75°F, n=226 days, ERA5 2018–2025). March is historically far better for sun here.

→ St. John, USVI live forecast — this week’s actual 7-day weather, not historical
→ Best destinations in February — all destinations ranked by February 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.