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Chatham County Climate

en Español

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Chatham County has a humid subtropical climate, with hot humid summers and chilly winters. Daily maximum temperature normals in the summer months are greater than 85°F and daily minimum temperature normals during the winter months are below 32°F. The average growing season is 195 days from average last frost on April 12 and average first frost on October 24. Chatham County is in USDA Hardiness Zone 7b, having an average low temperature of 5°F to 10°F.

A calendar of optimal planting dates for a wide variety of vegetable crops has been prepared for Chatham County and for Central North Carolina.

Monthly normals for daily maximum/minimum temperatures and monthly cumulative precipitation.

Average Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily Max. Temp. (⁰F) 49.3 53.6 61.8 70.9 77.8 85.2 88.2 86.9 80.5 70.9 62.0 52.0
Daily Min. Temp. (⁰F) 28.8 31.4 38.4 46.4 55.0 64.3 68.1 66.6 59.3 47.6 39.2 31.7
Precipitation (in.) 4.0 3.5 4.5 3.4 3.9 3.9 4.5 4.1 4.2 3.8 3.5 3.3

Average annual precipitation is 46.6 inches which is evenly distributed through the year. Precipitation, however, can vary greatly over shorter time periods. It is possible for a month’s worth of rain to fall in a four hour period. High variability in both spatial and temporal distribution of precipitation does lead to excessively wet or drought conditions.

Average annual rainfall graph for Chatham County 1995-2019

For current weather forecasts, visit the National Weather Service website.