Duncan, OK
Climate overview — based on NOAA 1991-2020 normals from DUNCAN, OK US.
Year-round temperatures (°F)
Climate summary
Duncan has an annual average temperature of 61.9°F with about 37.1 inches of precipitation per year and 2.8 inches of snow. The warmest month is July (average high 93.5°F), and the coldest is January (average low 28.4°F). May is typically the wettest month (5.58 in) and January the driest (1.52 in). Snow typically falls from November through March.
Best time to visit Duncan
Full guide →Climate change signal
All-time records →0 of 366 (0%) of Duncan's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1930s | 34 | |
| 1940s | 55 | |
| 1950s | 91 | |
| 1960s | 39 | |
| 1970s | 40 | |
| 1980s | 25 | |
| 1990s | 21 | |
| 2000s | 31 | |
| 2010s | 30 | |
| 2020s | 0 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 51.9°F | 28.4°F | 40.2°F | 1.52 in | 1.1 in | 5 |
| February | 56.5°F | 31.9°F | 44.2°F | 1.84 in | 0.4 in | 6 |
| March | 64.8°F | 41.2°F | 53.0°F | 2.76 in | 0.2 in | 7 |
| April | 73.4°F | 49.0°F | 61.2°F | 3.45 in | — | 7 |
| May | 80.5°F | 59.0°F | 69.7°F | 5.58 in | — | 9 |
| June | 88.5°F | 68.0°F | 78.2°F | 4.49 in | — | 8 |
| July | 93.5°F | 71.6°F | 82.6°F | 2.58 in | — | 6 |
| August | 93.2°F | 70.8°F | 82.0°F | 2.90 in | — | 6 |
| September | 85.8°F | 63.3°F | 74.6°F | 3.79 in | — | 7 |
| October | 75.5°F | 50.8°F | 63.1°F | 3.86 in | — | 7 |
| November | 63.5°F | 39.2°F | 51.3°F | 2.33 in | 0.3 in | 6 |
| December | 53.6°F | 30.7°F | 42.1°F | 2.04 in | 0.8 in | 6 |
Climate twins of Duncan
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).