US Geography / US Weather / Oklahoma Weather / Duncan |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 48 | 54 | 64 | 74 | 81 | 88 | 94 | 94 | 85 | 75 | 64 | 52 |
| Avg. Low | 25 | 30 | 38 | 50 | 58 | 66 | 71 | 70 | 62 | 50 | 38 | 28 |
| Mean | 38 | 44 | 52 | 64 | 70 | 78 | 84 | 82 | 74 | 64 | 51 | 41 |
| Avg. Precip. | 1.3 in | 1.7 in | 2.6 in | 3.0 in | 5.1 in | 4.0 in | 2.3 in | 2.4 in | 4.4 in | 3.4 in | 2.3 in | 1.5 in |
Degrees in Fahrenheit
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