Portsmouth, NH Weather & Climate Normals
What a normal year in Portsmouth actually looks like
On the 30-year record NOAA keeps for Portsmouth, NH, the comfort score comes out to 41/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Portsmouth's weather actually swings
Average temperatures in Portsmouth run from 25°F in Jan up to 70°F in Jul, a 45.8°F seasonal swing, one of the widest gaps in this dataset.
How wet Portsmouth actually gets
Over a typical year, Portsmouth sees about 50.65in of precipitation a year across roughly 126 days with measurable rain or snow, with 65in of snow a year.
Portsmouth against the rest of the country
Out of 4876 cities scored here, Portsmouth comes in at 4380; within NH alone it ranks 9 of 13. Population is about 22,938.
Checking the actual forecast
These figures come from GREENLAND, NH US, the NOAA station 3.6 miles from Portsmouth, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated