Morrow County Climate
Morrow County, Oregon
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
52.8°F
Annual Precip
10.8"
Annual Snowfall
8.3"
Extreme Heat Days
37
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
2,866
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Morrow County
Climate Verdict
Morrow County has a mild, with an average annual temperature of 52.8°F, arid conditions receiving just 10.8 inches of precipitation annually, occasional hot days — 37.099999999999994 per year above 90°F, light snow averaging 8.3 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 35.5°F. summers are warm — July averages 73.3°F. The 38°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Morrow County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Morrow County closely matches the Oregon statewide average temperature of 50.5°F, it is also noticeably drier, receiving 26.6 inches less precipitation than the state average.
Climate Profile
About Morrow County Weather
A Warm and Arid Plateau Climate
Morrow County averages 52.8°F annually, placing it very close to the national median temperature. This semi-arid region receives only 10.8 inches of rain each year, far below the national average for moisture.
Surpassing Oregon's Average Temperatures
The county is significantly warmer than the Oregon state average of 50.5°F. While much of the state deals with heavy rainfall, Morrow remains one of the drier and warmer pockets in the Pacific Northwest.
Warmer and Drier Than Its Neighbors
Morrow’s 52.8°F average exceeds neighbor Sherman County at 49.2°F and Umatilla County at 51.9°F. It records roughly 4 inches less annual precipitation than Umatilla, highlighting its position in the rain shadow.
Scorching Summers and Light Winter Snow
Residents face 37 extreme heat days above 90°F annually, driven by a July average of 73.3°F. Winters stay relatively mild with 8.3 inches of snow and a January average of 35.5°F.
Prepare for Heat and Low Moisture
Central air conditioning is essential here to manage more than a month of extreme summer heat. Gardeners should prioritize drought-tolerant landscaping since the county receives 26 inches less rain than the state average.
Frequently Asked Questions
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Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.