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Weather Almanac: Portsmouth, IA 51565

🗓️ Historical norms for October

September November
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
October avg. precipitation
🌧️ 2.59"
October days below freezing
📉 ≈8.1 days
Average October lows 36°F – 42°F
USDA Zone
5b
Annual extreme lows -15°F to -10°F
Last Spring Frost (36°F)
🌷 May 9
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First Fall Frost (36°F)
🍂 Sep 21
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Book Recommendations (ads!)

📚 Prairie & Plains States Month-by-Month Gardening: What to Do Each Month to Have a Beautiful Garden All Year

📚 Midwest Gardener's Handbook, 2nd Edition: All You Need to Know to Plan, Plant & Maintain a Midwest Garden

📚 The Timber Press Guide to Vegetable Gardening in the Midwest

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: HARLAN 1N (USC00133632)

Precipitation climatic data from weather station: HARLAN 1N (USC00133632)

Agricultural climatic data from weather station: HARLAN 1N (USC00133632)