Weather history and climate summary information is available for the following locations:
- Billings
- Glasgow
- Great Falls
- Helena
- Lewistown
- Miles City
- Missoula
Warmest April Days
The warmest April days in Montana are:
| Billings, Montana | 1939 | 92.3°F |
| Glasgow, Montana | 1980 | 91°F |
| Miles City, Montana | 2012 | 91°F |
| Miles City, Montana | 1987 | 90°F |
| Billings, Montana | 1980 | 90°F |
Coldest April Days
The coldest April days in Montana were:
| Great Falls, Montana | 2008 | -8°F |
| Glasgow, Montana | 1979 | -7.1°F |
| Great Falls, Montana | 1975 | -6°F |
| Lewistown, Montana | 1975 | -5.8°F |
| Lewistown, Montana | 1982 | -5.1°F |
Wettest April Days
The wettest single days in April occurred:
| Great Falls, Montana | 1983 | 10.9 inches |
| Helena, Montana | 1973 | 5.5 inches |
| Lewistown, Montana | 1995 | 5.1 inches |
| Missoula, Montana | 1973 | 5.1 inches |
| Billings, Montana | 1973 | 3.5 inches |