Houston (TX) Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows both the average monthly rainfall and the number of rainy days in Houston, Texas, United States of America. These values are calculated using 30 years of data (1990–2020) to ensure accuracy. Now, let’s break down all the details for a clearer picture.

Houston experiences significant rainfall throughout the year, averaging 1507 mm of precipitation annually.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm)

The seasons in Houston, bring significant changes in precipitation. The wettest month, July, receives heavy rainfall, with an average of 191 mm of precipitation.

This rainfall is distributed across 15 rainy days. In contrast, the driest month, February, experiences much less rainfall, totaling 67 mm over 9 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.

July, the wettest month, has a maximum daytime temperature of 34°C. The city receives 295 hours of sunshine in this period. During the driest month February you can expect a temperature of 19°C. For more detailed insights into the city’s temperatures, visit our Houston Temperature page.

Annual Precipitation in the United States of America

The map below shows the annual precipitation across the United States of America. You can also select the different months in case you are interested in a specific month.

Amsterdam Precipitation Compared World Wide

Houston’s average annual precipitation is 1507 mm. Let’s compare this to some popular worldwide tourist destinations:

The city of Rome, Italy, has an average annual precipitation of 832 mm, spread fairly evenly throughout the year.

Beijing, China, receives 560 mm of annual precipitation, concentrated in the summer months.

In Tokyo, Japan, the average annual precipitation is 1528 mm, with significant summer rains due to typhoon season.

Mumbai, India, experiences a tropical monsoon climate with 1860 mm of annual rainfall, with the majority of precipitation happening during the monsoon season from June to September.

How is Precipitation Measured?

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

Interesting weather facts

• Mawsynram in India is noted as being the wettest place on earth, with over 11 meters of rain falling every year.
• In contrast, Antofagasta in Chile is among the driest places on the planet, getting less than 0.1mm per year, with some years recording virtually no rainfall.
• Nearly 1,650 thunderstorm cells are estimated over the planet at any given time.

For more detailed information about Houston (TX)’s weather, including sunshine hours, humidity levels, and temperature data, visit our Houston (TX) Climate page.