Union (OK) Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from very warm to chilly in Union. Average daytime temperatures reach a very warm 34°C (93°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 10°C (50°F).

At night, temperatures range from around 22°C (72°F) in July to -3°C (27°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Union has a relatively rain/snowy climate with high precipitation levels, averaging 1052 mm (41 in) of rain/snowfall annually. Union can be quite wet during May, receiving approximately 160 mm (6.3 in) of precipitation over 12 rainy days.

In contrast, during the driest month (January), you will experience much drier conditions, with 28 mm (1.1 in) of precipitation spread across 5 rainy days. For more details, please visit our Union Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Union can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 11.2 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 5.4 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Union.

The city experiences its highest humidity in September, reaching 70%. In April, the humidity drops to its lowest level at 61%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year