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Weather Almanac: Portsmouth, NH 03801

🗓️ Historical norms for September

August October
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
September avg. precipitation
🌧️ 3.79"
September days below freezing
📉 ≈0.9 days
Average September lows 48°F – 52°F
USDA Zone
6a
Annual extreme lows -10°F to -5°F
Last Spring Frost (36°F)
🌷 May 28
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First Fall Frost (36°F)
🍂 Sep 16
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Book Recommendations (ads!)

📚 New England Month-by-Month Gardening: What To Do Each Month To Have a Beautiful Garden All Year - Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont

📚 New England Gardener's Handbook: All You Need to Know to Plan, Plant & Maintain a New England Garden

📚 The Timber Press Guide to Vegetable Gardening in the Northeast

F: Forecast
H: Normal High Temp
L: Normal Low Temp
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.

Temperature climatic data from weather station: GREENLAND (USC00273626)

Precipitation climatic data from weather station: ELIOT (USC00172602)

Agricultural climatic data from weather station: GREENLAND (USC00273626)