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Weather Almanac: Hartline, WA 99135

🗓️ Historical norms for September

August October
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
September avg. precipitation
🌧️ 0.44"
September days below freezing
📉 ≈0.5 days
Average September lows 45°F – 50°F
USDA Zone
6b
Annual extreme lows -5°F to 0°F
Last Spring Frost (36°F)
🌷 Jun 10
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First Fall Frost (36°F)
🍂 Sep 20
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Book Recommendations (ads!)

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

📚 Gardening in the Pacific Northwest: The Complete Homeowner's Guide

📚 Growing Vegetables West of the Cascades, 35th Anniversary Edition: The Complete Guide to Organic 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: HARTLINE (USC00453529)

Precipitation climatic data from weather station: COULEE DAM 1 SW (USC00451767)

Agricultural climatic data from weather station: HARTLINE (USC00453529)