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Weather Almanac: Rock Valley, IA 51247

🗓️ Historical norms for December

November January
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
December avg. precipitation
🌧️ 0.84"
December days below freezing
📉 ≈30.0 days
Average December lows 6°F – 19°F
USDA Zone
5a
Annual extreme lows -20°F to -15°F
Last Spring Frost (36°F)
🌷 May 15
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First Fall Frost (36°F)
🍂 Sep 18
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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: SIOUX CTR 2 SE (USC00137700)

Precipitation climatic data from weather station: ROCK VALLEY (USC00137152)

Agricultural climatic data from weather station: SIOUX CTR 2 SE (USC00137700)