May weather in Duncan, OK
The average temperature in Duncan in May is 69.7°F (59.0°F–80.5°F). Average precipitation: 5.58 inches.
May is a spring month in Duncan, and is warmer than the annual average of 61.9°F. Daily temperatures swing about 21.5°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 13h 48m. For travel, May is a wet month.
Avg High
80.5°F
Avg Low
59.0°F
Precipitation
5.58 in
Daylight
13h 48m
May records in Duncan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 97.0°F (1948) | 34.0°F (1960) | 2.49 in (1951) |
| May 2 | 97.0°F (1948) | 39.9°F (1970) | 2.90 in (1990) |
| May 3 | 96.1°F (1964) | 35.1°F (1954) | 2.73 in (1990) |
| May 4 | 93.9°F (1964) | 37.0°F (1954) | 1.59 in (1957) |
| May 5 | 96.1°F (1947) | 41.0°F (1978) | 2.11 in (1969) |
| May 6 | 91.0°F (1962) | 41.0°F (1979) | 2.45 in (1982) |
| May 7 | 93.9°F (1955) | 42.1°F (1960) | 1.73 in (2025) |
| May 8 | 95.0°F (1955) | 41.0°F (1938) | 2.79 in (1995) |
| May 9 | 96.1°F (2011) | 45.0°F (1961) | 2.35 in (1950) |
| May 10 | 99.0°F (1963) | 44.1°F (1997) | 4.05 in (1950) |
| May 11 | 99.0°F (1980) | 39.9°F (1946) | 2.73 in (1950) |
| May 12 | 98.1°F (1980) | 41.0°F (1979) | 1.89 in (1947) |
| May 13 | 93.0°F (1956) | 42.1°F (1966) | 4.45 in (1982) |
| May 14 | 93.9°F (1952) | 41.0°F (1975) | 2.38 in (1983) |
| May 15 | 91.9°F (1943) | 37.0°F (1942) | 1.43 in (1953) |
| May 16 | 95.0°F (1963) | 39.9°F (1942) | 2.37 in (2020) |
| May 17 | 98.1°F (1966) | 39.0°F (1945) | 3.52 in (1943) |
| May 18 | 93.9°F (1956) | 46.0°F (1968) | 1.68 in (1960) |
| May 19 | 98.1°F (1973) | 46.0°F (1971) | 9.85 in (1955) |
| May 20 | 98.1°F (1953) | 46.9°F (1981) | 5.05 in (1977) |
| May 21 | 99.0°F (1953) | 46.0°F (1942) | 1.77 in (1940) |
| May 22 | 104.0°F (1939) | 46.9°F (1945) | 1.14 in (1957) |
| May 23 | 100.9°F (1939) | 46.9°F (1967) | 4.07 in (1975) |
| May 24 | 104.0°F (2000) | 51.1°F (1940) | 2.67 in (1995) |
| May 25 | 102.9°F (2000) | 51.1°F (1947) | 2.56 in (2022) |
| May 26 | 98.1°F (1984) | 50.0°F (1992) | 3.90 in (1994) |
| May 27 | 95.0°F (1963) | 48.0°F (2003) | 6.74 in (2007) |
| May 28 | 98.1°F (1942) | 50.0°F (1976) | 2.03 in (1952) |
| May 29 | 97.0°F (1963) | 39.9°F (1947) | 1.56 in (1962) |
| May 30 | 99.0°F (1985) | 46.0°F (1947) | 2.00 in (1964) |
| May 31 | 102.9°F (1985) | 48.9°F (1983) | 3.54 in (1946) |