Cumulative Growing Degree Days, Base 43/86

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Click on the station names below for historical charts. Last updated on May 26, 2025.

Station PNG/GIF Region 05/25/25 05/25/24 Normal '20-'24 Source
LEGW Tri-Cities 1184.6 1202.5 1222.1 Agrimet
HRMO Hermiston 1176.3 1158.0 1176.3 Agrimet
MATT Mattawa 1138.1 1119.7 1120.4 AgWeatherNet
HRHW Harrah 1106.3 1085.8 1155.2 Agrimet
BF Brewster.N 900.5 888.7 865.8 AgWeatherNet
PARO Parkdale 850.0 794.0 782.2 Agrimet
MASW Chelan 828.9 801.0 778.6 Agrimet
STEM Stemilt / Wenatchee Hts 693.0 648.3 653.0 AgWeatherNet
Flipbook PNW 0.0 0.0 0.0 Today's Flipbook
Chelan-Harrah Chelan-Harrah Spread 0.0 0.0 0.0 Spread Analysis 2 (pdf)
PNW Comparison PNW 0.0 0.0 0.0 Spread Analysis 1 (pdf)

Disclaimer: The purpose of these charts is to look at relative trends in terms of cumulative Growing Degree Days (GDDs) in Washington and Oregon, using a lower threshold of 43 degrees farenheit and an upper threshold of 86 degrees farenheit. While GDDs can be helpful in understanding the timing of natural (phenological) events for various crops or insects, these charts do not try to model those relationships. To better analyse or phenologically model a particular crop or insect, a different degree base may be appropriate.

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