All locations will be closed Dec 15, 22-25, 29 and Jan 1 and close early during the last 2 weeks of December. See December Calendar for details.
The coldest month in Tulsa is January, with an average daily high of 46 degrees and a low of 26 degrees Fahrenheit. The warmest month is July or August with an average daily high of 94 degrees and a low of 71 degrees Fahrenheit.
More information such as sunrise and sunset tables, daily temperatures (F6 link), rain fall, snow fall, and wind speeds for Tulsa can also be found at the National Weather Service - Tulsa web site.
Source: National Weather Service web site