Herculaneum, MO
Climate overview — based on NOAA 1991-2020 normals from FESTUS, MO US.
Year-round temperatures (°F)
Climate summary
Herculaneum has an annual average temperature of 55.7°F with about 43.6 inches of precipitation per year and 9.2 inches of snow. The warmest month is July (average high 88.4°F), and the coldest is January (average low 22.3°F). April is typically the wettest month (4.91 in) and February the driest (2.51 in). Snow typically falls from November through April.
Best time to visit Herculaneum
Full guide →Climate change signal
All-time records →47 of 366 (12.8%) of Herculaneum's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1960s | 74 | |
| 1970s | 85 | |
| 1980s | 57 | |
| 1990s | 35 | |
| 2000s | 24 | |
| 2010s | 70 | |
| 2020s | 21 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 41.0°F | 22.3°F | 31.7°F | 2.68 in | 2.1 in | 8 |
| February | 46.3°F | 25.3°F | 35.8°F | 2.51 in | 2.7 in | 7 |
| March | 56.3°F | 33.6°F | 44.9°F | 4.00 in | 1.1 in | 10 |
| April | 67.8°F | 43.8°F | 55.8°F | 4.91 in | 0.2 in | 10 |
| May | 76.2°F | 53.8°F | 65.0°F | 4.76 in | — | 12 |
| June | 84.6°F | 62.6°F | 73.6°F | 4.74 in | — | 9 |
| July | 88.4°F | 67.2°F | 77.8°F | 3.83 in | — | 8 |
| August | 87.2°F | 65.4°F | 76.3°F | 3.59 in | — | 7 |
| September | 80.6°F | 57.1°F | 68.9°F | 3.38 in | — | 7 |
| October | 69.6°F | 45.5°F | 57.6°F | 2.83 in | — | 8 |
| November | 56.0°F | 35.1°F | 45.5°F | 3.54 in | 0.6 in | 8 |
| December | 45.1°F | 26.5°F | 35.8°F | 2.80 in | 2.5 in | 8 |
Climate twins of Herculaneum
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).