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Weather Almanac: Ottumwa, IA 52501

🗓️ Historical norms for May

April June
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
May avg. precipitation
🌧️ 5.00"
May days below freezing
📉 ≈0.3 days
Average May lows 48°F – 54°F
USDA Zone
5b
Annual extreme lows -15°F to -10°F
Last Spring Frost (36°F)
🌷 May 6
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First Fall Frost (36°F)
🍂 Sep 25
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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: OTTUMWA INDUSTRIAL AP (USW00014950)

Precipitation climatic data from weather station: OTTUMWA #1 (USC00136392)

Agricultural climatic data from weather station: OTTUMWA INDUSTRIAL AP (USW00014950)