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Climate change in New Hampshire encompasses the effects of climate change, attributed to man-made increases in atmospheric carbon dioxide, in the U.S. state of New Hampshire. The United States Environmental Protection Agency reports:
Graph of the observed annual number of warm nights for New Hampshire (top panel) from 1950 to 2020 and for the contiguous United States (CONUS; bottom panel) from 1900 to 2020 as described in the caption. Y-axis values range from 0 to 5 nights for New Hampshire and from 10 to 30 nights for CONUS.
2014 NH Climate Assessment. New Hampshire’s climate has gotten warmer and wetter . with greater warming during the cold season. As win-ters warmed, the length of the cold season decreased with fewer days with snow on the ground and fewer cold temperature extremes, especially after 1970. This is already impacting people, ecosystems and our econ-
We show the climate in New Hampshire by comparing the average weather in 3 representative places: Manchester, Portsmouth, and Berlin. You can add or remove cities to customize the report to your liking.
The New Hampshire Climate website provides visualizations of historical (1895-2012) and projected future (to 2100) climate trends across New Hampshire to help stakeholders; such as resource mangers, planners, businesses, governments and citizens; integrate projections of future climate change into their decision making process.
The 2017 NOAA Report summarizes how the New Hampshire climate has changed over the past century and how the future climate of the region will be affected by a warmer planet due to human activities.
Temperatures in New Hampshire have risen more than 3°F since the beginning of the 20th century (Figure 1). The number of hot days has varied across the period of record (1950–2020; Figure 2a); however, the most recent period (2015–2020) had the highest multiyear average of about 9 days.
