🌷 Your Ultimate Garden Calendar!

Weather Almanac: Cortland, IL 60112

🗓️ Historical norms for September

August October
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
September avg. precipitation
🌧️ 3.25"
September days below freezing
📉 ≈0.3 days
Average September lows 50°F – 55°F
USDA Zone
5b
Annual extreme lows -15°F to -10°F
Last Spring Frost (36°F)
🌷 May 14
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First Fall Frost (36°F)
🍂 Sep 27
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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: DE KALB (USC00112223)

Precipitation climatic data from weather station: DE KALB (USC00112223)

Agricultural climatic data from weather station: DE KALB (USC00112223)