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St. John, MO Climate
1991 to 2020 normals at St Louis Lambert INTL AP, 3.2 mi from the center of St. John, elevation 531 ft.
Average weather by month
Select a month for daily normals and last year's weather
| Month | Range | High | Low | Precip. | Snow |
|---|---|---|---|---|---|
| January | 40° | 24° | 2.59 in | 5.7 in | |
| February | 46° | 28° | 2.23 in | 4.3 in | |
| March | 57° | 37° | 3.50 in | 2.3 in | |
| April | 68° | 47° | 4.73 in | 0.2 in | |
| May | 77° | 58° | 4.82 in | 0.0 in | |
| June | 86° | 67° | 4.49 in | 0.0 in | |
| July | 90° | 71° | 3.93 in | 0.0 in | |
| August | 88° | 69° | 3.38 in | 0.0 in | |
| September | 81° | 61° | 2.96 in | 0.0 in | |
| October | 69° | 49° | 3.15 in | 0.0 in | |
| November | 56° | 37° | 3.42 in | 0.9 in | |
| December | 45° | 29° | 2.50 in | 3.2 in | |
| Year | 67° | 41.70 in | 16.6 in |
Frequently asked questions
- What is the hottest month in St. John, MO?
- July is the warmest month, with a normal high of 90°F at St Louis Lambert INTL AP.
- What is the coldest month in St. John, MO?
- January is the coldest month, with a normal low of 24°F.
- What is the wettest month in St. John, MO?
- May has the most precipitation on average, about 4.82 inches.