Olympia
Olympia / Tumwater · Zone 8b · South end of Puget Sound. Cold air pooling in the Deschutes valley; cooler lows than coastal stations.
Data through May 19, 2026
Season Progress
Cumulative GDD₃₂ year to date. Other stations shown faded for regional context.
Season vs. History
As of May 19, 2026, Olympia has accumulated 2151.3 GDD₃₂, which is 14% ahead of the 2020–2025 average of 1885.1 for this date. This season is tracking closest to 2020.
Cumulative GDD₃₂ by day of year. Current season (bold) against 2020–2025 individual years (faded) and their average (dashed).
Soil Temperature
Daily soil temperature at 2-inch depth. Bands: below 40°F (too cold), 40-50°F (cool-season), above 50°F (warm-season activation).
Frost Events
Every night the temperature dropped below 32°F. Color indicates severity: light (28-32°F), moderate (24-28°F), hard (<24°F).
Precipitation
Daily rainfall (bars) and cumulative total (bold line) for Olympia. Other stations shown faded.
Chill Hours
Cumulative hours below 45°F since January 1. Dashed lines show common fruit tree thresholds.
Dew Point & Disease Risk
Daily average dew point. Watch zone: 50-55°F. Active disease risk above 55°F.
Water Balance
Cumulative precipitation (solid) vs. evapotranspiration (dashed) for Olympia. When ET crosses above precipitation, start irrigating.
Sunshine Hours
7-day rolling average of daily sunshine. Other stations faded for comparison.
Monthly Summary
| Month | Low | High | Precip | Frost | Spray | GDD₃₂ | Sun hrs |
|---|---|---|---|---|---|---|---|
| Jan | 25.7° | 60.8° | 6.12" | 11 | 13 | 323.1 | 134.2 |
| Feb | 28.7° | 61.7° | 4.89" | 5 | 10 | 317.9 | 151.2 |
| Mar | 27.9° | 63.6° | 6.52" | 5 | 11 | 421.2 | 171.3 |
| Apr | 30.9° | 78.9° | 1.44" | 1 | 17 | 592.7 | 261.7 |
| May | 35.9° | 86.8° | 0.53" | 0 | 8 | 496.4 | 157.9 |
Other Stations
Data from the HortGuide station network via Open-Meteo. Your microclimate varies. Updated daily.