ERA5 almanac comparison — 8 years of real data
Hilton Head vs Hudson Valley: weather in December
Hilton Head edges out Hudson Valley for sun in December: 6% clear historically versus 0% (8-year ERA5 average, a 6-point gap). Both are viable — Hilton Head is the safer bet.
Hilton Head
SC
- Clear days, December
- 6%
- Sample size
- n=248 days
- Avg high
- 62°F
- Early December (1st–15th)
- 3%
- Late December (16th–end)
- 8%
- Rain frequency
- 27% of days
Hudson Valley
NY
- Clear days, December
- 0%
- Sample size
- n=248 days
- Avg high
- 41°F
- Early December (1st–15th)
- 0%
- Late December (16th–end)
- 0%
- Rain frequency
- 37% of days
Frequently asked
Is Hilton Head or Hudson Valley warmer in December?
Hilton Head runs warmer by day in December. Hilton Head averages highs of 62°F (highs n=248 days); Hudson Valley averages highs of 41°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Hilton Head or Hudson Valley in December?
Days with measurable rain: Hilton Head 27%, Hudson Valley 37% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in December, Hilton Head or Hudson Valley?
Hilton Head edges out Hudson Valley for sun in December: 6% clear historically versus 0% (8-year ERA5 average, a 6-point gap). Both are viable — Hilton Head is the safer bet.
Compare Hilton Head vs Hudson Valley 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.