🌷 Your Ultimate Garden Calendar!

Weather Almanac: Mattawa, WA 99349

🗓️ Historical norms for September

August October
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
September avg. precipitation
🌧️ 0.32"
September days below freezing
📉 ≈0.4 days
Average September lows 45°F – 50°F
USDA Zone
7a
Annual extreme lows 0°F to 5°F
Last Spring Frost (36°F)
🌷 May 14
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First Fall Frost (36°F)
🍂 Sep 24
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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: SMYRNA (USC00457727)

Precipitation climatic data from weather station: SMYRNA (USC00457727)

Agricultural climatic data from weather station: SMYRNA (USC00457727)