May weather in Roundup, MT
The average temperature in Roundup in May is 54.2°F (39.3°F–69.1°F). Average precipitation: 2.55 inches.
May is a spring month in Roundup, and is warmer than the annual average of 46.5°F. Daily temperatures swing about 29.8°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 14h 48m. For travel, May is a comfortable month to visit.
Avg High
69.1°F
Avg Low
39.3°F
Precipitation
2.55 in
Snow
0.1 in
May records in Roundup
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 88.0°F (1981) | 18.0°F (1950) | 0.27 in (1973) |
| May 2 | 91.0°F (1985) | 10.9°F (1954) | 0.82 in (1987) |
| May 3 | 86.0°F (1947) | 10.0°F (1954) | 1.34 in (1964) |
| May 4 | 87.1°F (1966) | 19.9°F (1967) | 0.99 in (1996) |
| May 5 | 90.0°F (1934) | 23.0°F (1967) | 0.56 in (2003) |
| May 6 | 91.0°F (1966) | 26.1°F (1949) | 0.80 in (1975) |
| May 7 | 91.9°F (1934) | 26.1°F (1946) | 1.11 in (1988) |
| May 8 | 90.0°F (1934) | 19.9°F (2010) | 0.84 in (1922) |
| May 9 | 87.1°F (2012) | 26.1°F (2002) | 0.72 in (1921) |
| May 10 | 86.0°F (1977) | 21.9°F (1946) | 1.72 in (1967) |
| May 11 | 90.0°F (1960) | 21.0°F (1968) | 1.15 in (1970) |
| May 12 | 95.0°F (1960) | 21.9°F (1943) | 2.30 in (1942) |
| May 13 | 95.0°F (2013) | 24.1°F (1943) | 1.33 in (1962) |
| May 14 | 93.0°F (1931) | 26.1°F (1953) | 0.37 in (1915) |
| May 15 | 95.0°F (1944) | 28.0°F (1943) | 0.55 in (1977) |
| May 16 | 91.9°F (1944) | 28.0°F (1986) | 0.80 in (1981) |
| May 17 | 90.0°F (1948) | 25.0°F (1982) | 0.90 in (1977) |
| May 18 | 93.9°F (1948) | 28.0°F (1938) | 1.52 in (1987) |
| May 19 | 93.9°F (2009) | 25.0°F (1997) | 1.50 in (1938) |
| May 20 | 91.9°F (1954) | 27.0°F (2003) | 1.53 in (1938) |
| May 21 | 93.0°F (1980) | 21.9°F (1963) | 1.62 in (1972) |
| May 22 | 95.0°F (1980) | 24.1°F (1963) | 2.07 in (2007) |
| May 23 | 95.0°F (1980) | 30.0°F (1949) | 0.95 in (1946) |
| May 24 | 93.9°F (1941) | 30.9°F (2007) | 1.15 in (1978) |
| May 25 | 95.0°F (1980) | 28.0°F (1950) | 1.07 in (1980) |
| May 26 | 96.1°F (1934) | 30.0°F (1920) | 0.64 in (2012) |
| May 27 | 95.0°F (1934) | 28.0°F (1932) | 0.65 in (1955) |
| May 28 | 100.0°F (1934) | 24.1°F (1947) | 1.11 in (1982) |
| May 29 | 98.1°F (1934) | 30.0°F (1917) | 1.07 in (1953) |
| May 30 | 95.0°F (1984) | 28.0°F (1917) | 1.45 in (1917) |
| May 31 | 93.9°F (1940) | 25.0°F (1917) | 1.11 in (1951) |