ERA5 almanac comparison — 8 years of real data

Denver vs Nashville: weather in April

Essentially a tie in April: Denver is 22% clear historically, Nashville is 18% clear (8-year ERA5 average) — within the noise. Avg high 64°F vs 69°F. Nashville also sees measurably more rain than Denver this month (41% vs 24% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.

What you are reading: 8-year historical averages, not a forecast. Either destination can still surprise you this specific April. For this week’s actual forecast, each destination links to its live page below.

Denver

Clear days, April: 22%
Sample size: n=240 days
Avg high: 64°F
Early April (1st–15th): 20%
Late April (16th–end): 24%
Rain frequency: 24% of days

See this week’s live forecast →

Nashville

Clear days, April: 18%
Sample size: n=240 days
Avg high: 69°F
Early April (1st–15th): 13%
Late April (16th–end): 22%
Rain frequency: 41% of days

See this week’s live forecast →

Compare Denver vs Nashville in another month

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.