Weather history and climate summary information is available for the following locations:
- Boise
- Mountain Home
- Pocatello
Warmest May Days
The warmest May days in Idaho are:
| Boise, Idaho | 2003 | 99°F |
| Mountain Home, Idaho | 2009 | 99°F |
| Boise, Idaho | 1936 | 98.2°F |
| Boise, Idaho | 1986 | 98.1°F |
| Mountain Home, Idaho | 1986 | 97°F |
Coldest May Days
The coldest May days in Idaho were:
| Pocatello, Idaho | 2002 | 19.9°F |
| Pocatello, Idaho | 2010 | 21°F |
| Pocatello, Idaho | 1982 | 21°F |
| Pocatello, Idaho | 2001 | 21.9°F |
| Boise, Idaho | 1982 | 21.9°F |
Wettest May Days
The wettest single days in May occurred:
| Boise, Idaho | 1973 | 4.3 inches |
| Pocatello, Idaho | 1973 | 3.2 inches |
| Boise, Idaho | 1990 | 2 inches |
| Pocatello, Idaho | 1991 | 1.3 inches |
| Boise, Idaho | 1983 | 1.2 inches |