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Weather Almanac: Fort Thompson, SD 57339

🗓️ Historical norms for September

August October
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
September avg. precipitation
🌧️ 2.25"
September days below freezing
📉 ≈0.9 days
Average September lows 47°F – 53°F
USDA Zone
4b
Annual extreme lows -25°F to -20°F
Last Spring Frost (36°F)
🌷 May 17
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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: LAKE SHARPE PROJECT (USC00394766)

Precipitation climatic data from weather station: LAKE SHARPE PROJECT (USC00394766)

Agricultural climatic data from weather station: LAKE SHARPE PROJECT (USC00394766)