Climate change in Harford County, Maryland
Since 1979, Harford County, Maryland has warmed 2.6°F, with 2 more days above 90°F, 20 more nights above 70°F and 4% more precipitation a year. Its climate in 1996–2025 is most like Anne Arundel County, MD's was in 1951–1980.
- Average temperature: +2.6°F
- Summer highs (Jun–Aug): +1.3°F
- Winter lows (Dec–Feb): +3.9°F
- Precipitation: +4%
- Wettest day of the year: +23%
- Longest dry spell: −1 days
- Days above 90°F: +2 days
- Nights above 70°F: +20 days
- Freezing nights: −19 days
- Frost-free season: +19 days
- Muggy days: +16 days
- Summer heat index (Jun–Aug): +2.8°F
- Extreme fire-weather days: +2 days
- Snowfall: −11%
- Snowy days (1 inch or more): −2 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.