Historical weather data, all-time temperature records, and monthly climate averages for Dover, NH. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Dover runs cool, with an average high of just 50° and a low dipping to 29°—still firmly coat weather. The date has seen wild swings over 129 years of records, from a balmy 72° in 1974 down to a brutal 9° in 1954. There's a 39% chance of rain today, with a small but real 7% shot at snow.
Dover's weather has real teeth: the mercury has topped out at 103° (July 1911) and bottomed out at a punishing -35° (January 1935), a 138-degree range that tells you this is no mild-mannered climate. A single day in July 2004 dumped 7.7 inches of rain, and a March 1937 storm buried the city under 18 inches of snow.
Dover's summer sweet spot runs from early July through mid-August, with average highs peaking around 83° the week of July 9–15. January is the cold core of winter, with highs scraping just 33°. If you're watching for rain, late November into early December is the wettest stretch of the year, averaging over an inch per week.