Hannibal, Missouri Weather
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Climate of Hannibal: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Hannibal, with average daytime highs around 31°C. January is the coolest, when nights typically fall to about -7°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 38°C, so the seasons feel very different from each other.
The area receives about 1010 mm of rain in a typical year. Most of it falls from April to August (around 55% of the yearly total), and May is the wettest month at roughly 123 mm.
For outdoor plans and travel, September to October usually offer the most comfortable weather in Hannibal, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 2° | -7° | 48 mm | 82% |
| Feb | 4° | -6° | 49 mm | 80% |
| Mar | 12° | 0° | 73 mm | 77% |
| Apr | 19° | 6° | 106 mm | 74% |
| May | 23° | 13° | 123 mm | 77% |
| Jun | 28° | 18° | 120 mm | 76% |
| Jul | 31° | 20° | 105 mm | 72% |
| Aug | 30° | 19° | 100 mm | 71% |
| Sep | 27° | 14° | 84 mm | 70% |
| Oct | 19° | 7° | 87 mm | 72% |
| Nov | 11° | 1° | 61 mm | 77% |
| Dec | 5° | -4° | 56 mm | 82% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Hannibal. Values describe typical conditions, not a forecast.
About Hannibal weather
Hannibal is one of many towns in Missouri's humid continental-to-subtropical climate, prone to severe spring storms, about 156 km north-west of St. Louis. Before the rains arrive, there's hot, humid summers (June–August). Cooler months mean cold winters (December–February) with occasional ice storms. This page shows live, auto-refreshing weather for Hannibal: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Hannibal is about 156 km north-west of St. Louis, in Missouri.
Hannibal sees cold winters (December–February) with occasional ice storms.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Hannibal's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Hannibal, with average daytime highs of about 31°C and nights around 20°C.
The coldest nights come in January, when the average low is about -7°C and daytime highs reach around 2°C. Frost is possible on clear, calm nights.
Hannibal receives about 1010 mm of rain in a typical year. May is the wettest month at roughly 123 mm, and the main rainy period is April to August.
September to October usually offer the most comfortable weather in Hannibal, with mild daytime temperatures and little rain.
In November Hannibal typically sees daytime highs near 11°C and lows near 1°C, with about 61 mm of rain over the month and average humidity around 77%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Hannibal is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Hannibal's day-to-day weather follows the broader pattern of Missouri described above. See the hourly weather forecast or the air quality index for more detail.