Stillwater (OK) Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Stillwater, Oklahoma, United States of America. Long-term data from 1990 to 2020 was used to calculate these averages. Let's now guide you through the details for a complete overview.

Generally, Stillwater has a moderate amount of precipitation, averaging 901 mm (35 in) of rain/snowfall annually. However, it does experience a distinct dry season during certain months. Take a look at our detailed charts below to see the seasonal variation.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

The seasons in Stillwater, bring significant changes in precipitation. The wettest month, May, receives high rainfall, with an average of 129 mm (5.1 in) of precipitation. This rainfall is distributed across 12 rainy days.

In contrast, the driest month, January, experiences much less rainfall, totaling 19 mm (0.7 in) over 3 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.

May, the wettest month, has a maximum daytime temperature of 26°C (79°F). During the driest month January you can expect a temperature of 10°C (50°F). For more detailed insights into the city's temperatures, visit our Stillwater Temperature page.

Stillwater's average annual precipitation is 901 mm (35 in). Let's compare this to some popular worldwide tourist destinations:

In Lisbon, Portugal, the average annual precipitation is 774 mm (30 in), characterized by wet winters and dry summers typical of the Mediterranean climate.

In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.

Perth, Australia, receives 565 mm (22 in) of rainfall annually, mostly during the winter months.

Kuala Lumpur, Malaysia, receives 2529 mm (100 in) of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.

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.

Precipitation has a very strong role in determining the local climate and ecosystem:

• Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
• Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.

• The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
• Approximately 70% of lightning bolts strike land rather than oceans.
• A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.

For more detailed information about Stillwater (OK)'s weather, including sunshine hours, humidity levels, and temperature data, visit our Stillwater (OK) Climate page.