Climate change in Sussex County, Delaware
Since 1979, Sussex County, Delaware has warmed 3.4°F, with 11 more days above 90°F, 23 more nights above 70°F and 3% more precipitation a year. Its climate in 1996–2025 is most like Lancaster County, VA's was in 1951–1980.
- Average temperature: +3.4°F
- Summer highs (Jun–Aug): +2.7°F
- Winter lows (Dec–Feb): +3.8°F
- Precipitation: +3%
- Wettest day of the year: +33%
- Longest dry spell: +1 days
- Days above 90°F: +11 days
- Nights above 70°F: +23 days
- Freezing nights: −16 days
- Frost-free season: +17 days
- Muggy days: +13 days
- Summer heat index (Jun–Aug): +3.6°F
- Extreme fire-weather days: +7 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.