Houston Weather Averages

Houston, Texas enjoys warm and mild weather for much of the year. While summers are hot, days of extreme heat are uncommon.

Rainfall peaks in late spring and again in fall. Yet usually the sun shines most of the time.

This page gives detailed information on the annual weather averages for Houston.

You can jump directly to data and descriptions for:

The numbers here are historical averages based on climate data gathered at the George Bush Intercontinental Airport, located north of downtown Houston.

Temperature Weather iconTemperature

80 °F annual average high 27 °C
60 °F annual average low 16 °C

Houston's coldest days of the year usually occur in early January when the daily maximum temperature averages 62 degrees Fahrenheit (17 degrees Celsius) and the minimum averages 43 °F (6 °C).

The year's hottest days are normally in mid August. The average temperature peaks then with daily highs of 95 °F (35 °C) and nighttime lows of 75 °F (24 °C).

201 days 80 °F max. or more (27 °C)
41 days 40 °F min. or less (4 °C)

Houston averages 102 days a year when the temperatures reaches into the 90s °F (over 32 °C). Typically 4 of those days soar into the 100s (over 38 °C).

The temperature dips to freezing or below on an average of 10 nights a year. But Houston doesn't get as cold as 20 °F (-8 °C) every year.

Rainy Weather iconPrecipitation

49.8 in total precipitation 1264 mm
104 days of rain or snowfall

June is usually the rainiest month of the year in Houston, while February is the driest.

Most years in Houston are free of snow. But snow can land in December, January or February.

Sunny Weather iconSun

59 % sunshine
90 days clear skies

The sun's rays reach the ground in Houston during 59 percent of daylight hours on average year round, for a total of 2620 hours annually. Typically on 90 days a year the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in Houston averages 12 hours and 9 minutes a day. The shortest days of the year in mid December have 10 hours and 14 minutes of daylight. The year's longest days in mid June last 14:03 from sunrise to sunset.

Humid Weather iconHumidity

75 % average humidity

The annual average for relative humidity in Houston ranges throughout the day from 90 percent at 6:00 am to 55 percent at 3:00 pm standard time.

Local Time12 am3 am6 am9 am12 pm3 pm6 pm9 pm
Humidity % 86 89 90 76 59 55 65 79

Windy Weather iconWind

7.6 mph wind speed average 12.2 kph

April is usually the windiest month for Houston, while the wind is calmest during August.

Stormy Weather iconStorms

15 days precipitation of 1 inch (25 mm) or more
61 days with thunderstorms a year
5 % chance a named storm makes landfall

Thunderstorms occur most often in July and August, but can appear over Houston during any month.

In any single year, there's a 3 percent probability that a hurricane will reach land in Harris county, which includes Houston. For major hurricanes of category 3 to 5, the likelihood drops to 1 percent. Named storms usually arrive during the months of June to November, while hurricanes are generally restricted to August, September and October.

The chances that a wind gust reaches 40 miles per hour (64 kilometres an hour) or greater is 33 percent a year. Intense hurricane force winds that top 115 mph (185 kph) have a 4 percent probability of blasting the county.

Reference

These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals. The named storm and wind gust probability information comes from United States Landfalling Hurricane Probability Project of Colorado State University and Bridgewater State University.

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