🌷 Your Ultimate Garden Calendar!

Weather Almanac: Rancho Cucamonga, CA 91739

🗓️ Historical norms for December

November January
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
December avg. precipitation
🌧️ 5.79"
December days below freezing
📉 ≈0.5 days
Average December lows 41°F – 45°F
USDA Zone
10a
Annual extreme lows 30°F to 35°F
Last Spring Frost (36°F)
🌷 Feb 24
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First Fall Frost (36°F)
🍂 Dec 2
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Book Recommendations (ads!)

📚 Month-by-Month Gardening California: What to Do Each Month to Have a Beautiful Garden All Year

📚 Pacific Northwest Month-by-Month Gardening: What to Do Each Month to Have a Beautiful Garden All Year

📚 California Gardener's Handbook: Your Complete Guide: Select - Plan - Plant - Maintain - Problem-solve

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: ONTARIO INTL AP (USW00003102)

Precipitation climatic data from weather station: LYTLE CREEK RS (USC00045218)

Agricultural climatic data from weather station: ONTARIO INTL AP (USW00003102)