ERA5 almanac comparison — 8 years of real data
Door County vs St. Augustine: weather in December
St. Augustine edges out Door County for sun in December: 13% clear historically versus 0% (8-year ERA5 average, a 13-point gap). Both are viable — St. Augustine is the safer bet.
Door County
WI
- Clear days, December
- 0%
- Sample size
- n=248 days
- Avg high
- 34°F
- Early December (1st–15th)
- 0%
- Late December (16th–end)
- 0%
- Rain frequency
- 29% of days
St. Augustine
FL
- Clear days, December
- 13%
- Sample size
- n=248 days
- Avg high
- 67°F
- Early December (1st–15th)
- 13%
- Late December (16th–end)
- 13%
- Rain frequency
- 25% of days
Frequently asked
Is Door County or St. Augustine warmer in December?
St. Augustine runs warmer by day in December. Door County averages highs of 34°F (highs n=248 days); St. Augustine averages highs of 67°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Door County or St. Augustine in December?
Days with measurable rain: Door County 29%, St. Augustine 25% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in December, Door County or St. Augustine?
St. Augustine edges out Door County for sun in December: 13% clear historically versus 0% (8-year ERA5 average, a 13-point gap). Both are viable — St. Augustine is the safer bet.
Compare Door County vs St. Augustine 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 forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.