ERA5 almanac comparison — 8 years of real data
Jacksonville vs St. Augustine: weather in December
Essentially a tie in December: Jacksonville is 16% clear historically, St. Augustine is 13% clear (8-year ERA5 average) — within the noise. Avg high 67°F vs 67°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
Jacksonville
FL
- Clear days, December
- 16%
- Sample size
- n=248 days
- Avg high
- 67°F
- Early December (1st–15th)
- 16%
- Late December (16th–end)
- 16%
- Rain frequency
- 22% 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 Jacksonville or St. Augustine warmer in December?
Equally warm by day in December. Jacksonville averages highs of 67°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 Jacksonville or St. Augustine in December?
Days with measurable rain: Jacksonville 22%, St. Augustine 25% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in December, Jacksonville or St. Augustine?
Essentially a tie in December: Jacksonville is 16% clear historically, St. Augustine is 13% clear (8-year ERA5 average) — within the noise. Avg high 67°F vs 67°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
Compare Jacksonville 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.