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Weather Almanac: Ottawa, IL 61350

🗓️ Historical norms for March

February April
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
March avg. precipitation
🌧️ 2.46"
March days below freezing
📉 ≈19.7 days
Average March lows 26°F – 33°F
USDA Zone
5b
Annual extreme lows -15°F to -10°F
Last Spring Frost (36°F)
🌷 May 7
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First Fall Frost (36°F)
🍂 Oct 2
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Book Recommendations (ads!)

📚 Illinois, Indiana & Ohio Month-by-Month Gardening: What to Do Each Month to Have a Beautiful Garden All Year

📚 Grow Great Vegetables Illinois

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

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: OTTAWA 5SW (USC00116526)

Precipitation climatic data from weather station: OTTAWA 5SW (USC00116526)

Agricultural climatic data from weather station: OTTAWA 5SW (USC00116526)