Weather
During periods of snow and ice the road conditions and delays on Fort Sill may be checked by visiting the official Fort Sill website.
Oklahoma is occasionally known to have tornadoes from time to time. The National Weather Service issues two types of alerts during periods of severe storms. The first alert is a Tornado Watch. A Tornado Watch means conditions are favorable for the formation of a tornado. The second alert is a Tornado Warning. A Tornado Warning is issued when a tornado funnel cloud has been spotted or a tornado is found by weather radar. Emergency sirens are activated during a Tornado Warning. Upon hearing the sirens or being notified by TV or radio you should seek shelter. For more information on tornados please read the NOAA Tornado Guide.
Fort Sill Average Temperatures and Precipitation
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| High | 50° | 56° | 65° | 73° | 82° | 90° | 96° | 95° | 86° | 76° | 62° | 52° |
| Low | 26° | 31° | 40° | 49° | 59° | 68° | 73° | 72° | 63° | 52° | 39° | 30° |
| Average | 38° | 44° | 52° | 61° | 71° | 79° | 84° | 83° | 75° | 64° | 51° | 41° |
| Precipitation | 1.2 in | 1.4 in | 2.5 in | 2.9 in | 5.1 in | 4.0 in | 2.0 in | 2.4 in | 3.4 in | 3.2 in | 1.9 in | 1.7 in |