May weather in Grass Range, MT
The average temperature in Grass Range in May is 52.8°F (39.5°F–66.0°F). Average precipitation: 3.39 inches. Average snowfall is 0.9 inches.
May is a spring month in Grass Range, and is warmer than the annual average of 45.5°F. Daily temperatures swing about 26.5°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 14h 51m. For travel, May is a comfortable month to visit.
Avg High
66.0°F
Avg Low
39.5°F
Precipitation
3.39 in
Snow
0.9 in
May records in Grass Range
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 86.0°F (1981) | 14.0°F (2013) | 1.24 in (1915) |
| May 2 | 89.1°F (1985) | 6.1°F (1954) | 1.37 in (1964) |
| May 3 | 90.0°F (1985) | 8.1°F (1954) | 1.83 in (1964) |
| May 4 | 84.9°F (1966) | 9.0°F (1954) | 0.65 in (1999) |
| May 5 | 87.1°F (1934) | 19.9°F (2006) | 1.05 in (2025) |
| May 6 | 88.0°F (1966) | 21.9°F (1999) | 1.47 in (1975) |
| May 7 | 87.1°F (1987) | 16.0°F (1945) | 2.62 in (1988) |
| May 8 | 88.0°F (1987) | 14.0°F (1945) | 1.40 in (2024) |
| May 9 | 88.0°F (1977) | 18.0°F (2002) | 0.99 in (2011) |
| May 10 | 90.0°F (1977) | 12.9°F (1946) | 1.91 in (1942) |
| May 11 | 90.0°F (1960) | 21.0°F (1946) | 1.25 in (1970) |
| May 12 | 90.0°F (1941) | 16.0°F (1943) | 1.80 in (1981) |
| May 13 | 89.1°F (2001) | 21.0°F (1953) | 2.26 in (1962) |
| May 14 | 93.0°F (1936) | 21.9°F (1953) | 0.57 in (1966) |
| May 15 | 90.0°F (1987) | 27.0°F (1943) | 0.84 in (1977) |
| May 16 | 91.9°F (1934) | 27.0°F (1937) | 2.40 in (1981) |
| May 17 | 89.1°F (1988) | 27.0°F (1974) | 1.12 in (1944) |
| May 18 | 87.1°F (1992) | 26.1°F (1968) | 1.50 in (2018) |
| May 19 | 93.0°F (1954) | 26.1°F (1997) | 1.70 in (1938) |
| May 20 | 89.1°F (1958) | 27.0°F (1968) | 1.86 in (1974) |
| May 21 | 93.0°F (1980) | 23.0°F (1963) | 1.69 in (1962) |
| May 22 | 97.0°F (1980) | 26.1°F (2022) | 1.85 in (2008) |
| May 23 | 95.0°F (1980) | 28.0°F (1947) | 1.62 in (2008) |
| May 24 | 91.9°F (1941) | 28.0°F (1954) | 1.53 in (2008) |
| May 25 | 90.0°F (1934) | 19.9°F (2012) | 1.95 in (1980) |
| May 26 | 93.9°F (1934) | 21.9°F (2012) | 1.54 in (1997) |
| May 27 | 93.0°F (1934) | 27.0°F (2012) | 1.90 in (2019) |
| May 28 | 95.0°F (1934) | 16.0°F (1947) | 1.32 in (1982) |
| May 29 | 96.1°F (1936) | 30.0°F (1947) | 1.82 in (1953) |
| May 30 | 95.0°F (1936) | 32.0°F (1954) | 1.42 in (2013) |
| May 31 | 91.9°F (1936) | 27.0°F (1982) | 1.48 in (1941) |