Index to Degree-Day Data and Maps of USA
Click on a map for full region index page Home Introduction Suggestions for use
Northwestern
OR WA ID MT WY tables
Custom maps
daily NW USA DD maps - this year to date
North Central
data table Custom maps
daily NC USA DD maps - this year to date
Great Lakes Central
data table Custom maps
daily GL USA DD maps - this year to date
Northeastern
data table Custom maps
daily NE USA DD maps - this year to date
Southwestern
data table Custom maps
daily SW USA DD maps - this year to date
South Central
data table Custom maps
daily SC USA DD maps - this year to date
Southeastern
data table Custom maps
daily SE USA DD maps - this year to date
Full USA
click map for full USA daily maps index
US this year to date
Oregon
daily Oregon DD maps - this year to date
Washington
daily WA DD maps - this year to date
Idaho
daily ID DD maps - this year to date
Montana
daily MT DD maps - this year to date

Introduction
These maps are calculated daily using the GIS GRASS 5.4, and are based on 1) near-real time temperature data from 12,000+ AgriMet, HydroMet, National Weather Service, RAWS, Snotel, and weather stations from dozens of other networks, 2) historical average temperature data (1971-2000 Normals) from the National Climate Date Center (clim84), 3) PRISM monthly max and min temperature maps, and 4) corrections based on inverse-distance squared interpolations of differences between PRISM map-based and real-time degree-day calculations.  See More info. on methodology for creating DD maps. Also try out our Degree-day Mapping Calculator for control over thresholds, calculation method, dates, and mapping options.

Suggestions for Use
With these maps, you can 1) track the extent of degree-day (heat unit) build-up so far this growing season using 3 common thresholds: 32°, 41°, and 50° F, 2) compare this year's heat unit build-up with 30-year historical average or "normal" heat units, 3) monitor deviations between the current year and normal heat-unit build up (which indicates how much warmer or cooler than normal the year has been so far), 4) select the full region or a single state and use the interactive interface, and 5) with GRASSLinks, interact with these maps by zooming and querying degree-days at specific locations, and use the site-specific degree-day calculator for the nearest weather station to where you click in the map.


[IPM Weather/Degree-Days Home] [Intro] [US DD Mapmaker] [DD Models and Calculator] [Links]


National Plant Diagnostics Network Integrated Plant Protection Center at OSU Oregon State University The PRISM Group at OSU Western
Region Pest Management Center Cooperative
State Research, Education, and Extension Service
This page updated Mar 7, 2009
Contact Len Coop at coopl@science.oregonstate.edu if you have any questions about this information.