Harlingen Rio Grande, TX Climate

Climate Insight: Harlingen Rio Grande, TX

The NOAA 1991–2020 climate normals describe Harlingen Rio Grande, Texas as a location with an annual average temperature of 75°F, ranging from a mean daily high of 86°F to a mean daily low of 64°F. August is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from station USW00012904, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.

Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Harlingen Rio Grande receives roughly 24.0 inches of precipitation each year, predominantly as rainfall. Growing-season length varies with elevation and microclimate, with the last spring freeze near January 8 and the first fall freeze near December 29. For energy use, 569 heating degree days and 4,220 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Harlingen Rio Grande scores 87/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows — shoulder seasons for mild highs and lows, peak summer for August-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.