In terms of precipitation, rainfall in Portsmouth, New Hampshire ranges from 57.0 - 129.0 inches per month. November is typically the wettest month, when rainfall can reach 129.0 mm. August is typically the driest time to visit Portsmouth, New Hampshire when rainfall is around 57.0 mm.
If weather is an important factor for your trip to Portsmouth, New Hampshire, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -4.0 C).
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