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Portsmouth city, New Hampshire

Official LSAD Designation: Portsmouth city • Census GEOID: 3362900 • Rockingham County

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Portsmouth city.

Reference Weather Station: GREENLAND, NH US (ID: USC00273626) • Located 3.6 miles from community center • Elevation: 29.0 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 32.6° 16.3° 24.4° 3.63"
February 35.6° 17.6° 26.6° 3.57"
March 43.3° 25.3° 34.3° 4.77"
April 55.8° 34.8° 45.3° 4.56"
May 66.1° 44.8° 55.4° 3.95"
June 75.0° 54.1° 64.5° 4.59"
July 80.5° 60.1° 70.3° 3.89"
August 79.4° 58.8° 69.1° 3.66"
September 71.8° 51.7° 61.7° 4.08"
October 59.7° 40.5° 50.1° 4.95"
November 48.1° 31.2° 39.7° 4.12"
December 37.8° 22.3° 30.0° 4.88"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station GREENLAND, NH US (ID: USC00273626) • 3.6 miles from community center .

This is the same reference station used for monthly normals.

Annual mean Annual mean of daily highs Annual mean of daily lows
Annual temperature history at GREENLAND, NH US Year is the horizontal axis. Annual mean temperature in degrees Fahrenheit is the vertical axis. Dots show recorded years; lines connect consecutive available years only. Missing years are gaps, with no interpolation. Optional dashed lines show annual mean of daily highs and lows. Exact values appear in the data table below. 35.0 42.3 49.5 56.8 64.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 50.2°F 2011: Annual mean 49.2°F 2012: Annual mean 51.1°F 2013: Annual mean 48.6°F 2016: Annual mean 49.3°F 2017: Annual mean 48.4°F 2018: Annual mean 47.9°F 2019: Annual mean 47.0°F 2021: Annual mean 49.8°F 2022: Annual mean 49.2°F 2023: Annual mean 50.0°F 2024: Annual mean 50.0°F 2010: Annual mean of daily highs 60.3°F 2011: Annual mean of daily highs 59.2°F 2012: Annual mean of daily highs 60.9°F 2013: Annual mean of daily highs 58.7°F 2016: Annual mean of daily highs 59.3°F 2017: Annual mean of daily highs 57.7°F 2018: Annual mean of daily highs 57.3°F 2019: Annual mean of daily highs 56.4°F 2021: Annual mean of daily highs 58.9°F 2022: Annual mean of daily highs 59.3°F 2023: Annual mean of daily highs 58.9°F 2024: Annual mean of daily highs 59.6°F 2010: Annual mean of daily lows 40.1°F 2011: Annual mean of daily lows 39.2°F 2012: Annual mean of daily lows 41.2°F 2013: Annual mean of daily lows 38.5°F 2016: Annual mean of daily lows 39.3°F 2017: Annual mean of daily lows 39.0°F 2018: Annual mean of daily lows 38.6°F 2019: Annual mean of daily lows 37.5°F 2021: Annual mean of daily lows 40.6°F 2022: Annual mean of daily lows 39.1°F 2023: Annual mean of daily lows 41.1°F 2024: Annual mean of daily lows 40.4°F

Source: NOAA NCEI Global Summary of the Year.

Annual temperature data table (°F)
Annual station temperatures, 2010–2025. Unavailable means no reported value.
Year Annual mean (°F) Annual mean of daily highs (°F) Annual mean of daily lows (°F)
2010 50.2 60.3 40.1
2011 49.2 59.2 39.2
2012 51.1 60.9 41.2
2013 48.6 58.7 38.5
2014 Unavailable Unavailable Unavailable
2015 Unavailable Unavailable Unavailable
2016 49.3 59.3 39.3
2017 48.4 57.7 39.0
2018 47.9 57.3 38.6
2019 47.0 56.4 37.5
2020 Unavailable Unavailable Unavailable
2021 49.8 58.9 40.6
2022 49.2 59.3 39.1
2023 50.0 58.9 41.1
2024 50.0 59.6 40.4
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.