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Weather Almanac: O'Fallon, MO 63366

🗓️ Historical norms for May

April June
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
May avg. precipitation
🌧️ 4.92"
May days below freezing
📉 ≈0.0 days
Average May lows 49°F – 57°F
USDA Zone
6b
Annual extreme lows -5°F to 0°F
Last Spring Frost (36°F)
🌷 Apr 29
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First Fall Frost (36°F)
🍂 Oct 6
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Book Recommendations (ads!)

📚 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

📚 Growing the Midwest Garden: Regional Ornamental Gardening

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: ST PETERS 2 SSE (USC00237475)

Precipitation climatic data from weather station: ST PETERS 2 SSE (USC00237475)

Agricultural climatic data from weather station: ST PETERS 2 SSE (USC00237475)