Weather history and climate summary information is available for the following locations:
- Eugene
- Medford
- Pendleton
- Portland
Warmest May Days
The warmest May days in Oregon are:
| Medford, Oregon | 1986 | 102.9°F |
| Medford, Oregon | 2008 | 102°F |
| Medford, Oregon | 1987 | 100.9°F |
| Portland, Oregon | 1983 | 100°F |
| Medford, Oregon | 2001 | 100°F |
Coldest May Days
The coldest May days in Oregon were:
| Pendleton, Oregon | 2006 | 27°F |
| Eugene, Oregon | 1985 | 28.9°F |
| Medford, Oregon | 1978 | 29.8°F |
| Medford, Oregon | 1979 | 29.8°F |
| Medford, Oregon | 1981 | 29.8°F |
Wettest May Days
The wettest single days in May occurred:
| Medford, Oregon | 1973 | 4.7 inches |
| Pendleton, Oregon | 1973 | 4.7 inches |
| Eugene, Oregon | 1973 | 2.2 inches |
| Eugene, Oregon | 1991 | 2.2 inches |
| Eugene, Oregon | 1979 | 1.3 inches |