Climate and monthly weather forecastHannibal, MO
Climate and monthly weather forecast
The climate of Hannibal
Hannibal, Missouri, USA, experiences a Dfa category climate according to the Köppen climate classification. This distinguishes it as a humid continental region with no dry season and hot summers. The city experiences a wide range of weather conditions throughout the year with distinct variations across different seasons. The average high temperature fluctuates from a frosty 34°F (1.1°C) in January to a summery 84.7°F (29.3°C) in July, while the average low temperature shifts from a chilly 21.6°F (-5.8°C) in January to a milder 67.1°F (19.5°C) in July.Relatively high humidity is prevalent throughout the year with values around 77% to 80%.
Year-round, Hannibal typically sees between 1.14" (29mm) to 3.39" (86mm) of rainfall per month. The number of rain days fluctuates from 5.3 to 17.3, significantly increasing from February to May. It is worth noting that snowfall occasionally occurs from January to April and November to December, with the maximum snowfall of 3.31" (84mm) recorded in January. In terms of daylight duration, the shortest days are in December with an average of 9.4 hours of daylight, while the longest ones are in June and July with approximately 14.7 to 14.9 hours.
The best time to visit Hannibal
Given the climatic conditions, the best time to visit Hannibal depends primarily on one's preference for certain weather. For those who enjoy warm conditions, the months of June to August provide a balmy setting with temperatures peaking at an average high of 84.7°F (29.3°C) in July. This period also offers the most prolonged daylight hours, allowing for extended sightseeing and outdoor activities. On the contrary, those who prefer moderate temperatures might consider visiting in May when the average high is 72.7°F (22.6°C) or September with a reasonable high of 78.4°F (25.8°C).The worst time to visit Hannibal
The less favorable months for visiting Hannibal would be during the colder part of the year. From November to March, the city experiences low temperatures with January being the coldest month, averaging at a high and low of 34°F (1.1°C) and 21.6°F (-5.8°C) respectively. Additionally, the city experiences its maximum snowfall of 3.31" (84mm) in January and relatively short daylight hours in December causing a reduction in outdoor activities.Spring weather in Hannibal
Spring in Hannibal, seen from March to May, experiences a considerable increase in temperatures and rainfall. The average high temperature rises steadily from 51.6°F (10.9°C) to 72.7°F (22.6°C) while the low temperature varies between 35.8°F (2.1°C) to 55.8°F (13.2°C). The amount of rainfall increases significantly during this season, peaking at 3.39" (86mm) in May. The total daylight hours extend from 12 hours in March to 14.4 hours in May, offering ample time for exploring the outdoors.Summer weather in Hannibal
The summer months of June to August in Hannibal are quite warm, with the average high temperature reaching its peak at 84.7°F (29.3°C) in July. Low temperatures remain comfortable, ranging from 64.4°F (18°C) to 67.1°F (19.5°C). Despite being the hottest period, rainfall is moderate with June seeing the highest amount of 2.95" (75mm). The maximum daylight is experienced during this season, offering nearly 15 hours in both June and July.Autumn weather in Hannibal
Autumn, from September to November, witnesses a gradual decline in temperature and humidity in Hannibal. The average high temperature decreases from a warm 78.4°F (25.8°C) in September to a cooler 51.4°F (10.8°C) in November. The average low temperature follows a similar pattern, dropping from 58.3°F (14.6°C) to 36.1°F (2.3°C) during this period. Rainfall decreases steadily throughout the season, from 2.2" (56mm) in September to 1.54" (39mm) in November.Winter weather in Hannibal
December through February is the coldest time of year in Hannibal, with average high temperatures falling between 34°F (1.1°C) to 38.8°F (3.8°C) and low temperatures descending from 27.1°F (-2.7°C) to 24.8°F (-4°C). Precipitation during this period includes both rain and occasional snow, with the substantial snowfall of 3.31" (84mm) typically occurring in January. The winter season also brings the shortest daylight duration, decreasing from 10 hours in December to 9.7 hours in January.Weather in January
January's weather in Hannibal, Missouri is characterized by a blend of cold temperatures and a significant amount of snowfall. Daylight hours are scarce due to the winter season, with the sun fading early and rising late. The first month of the year exhibits a notable chill, with the high and low temperatures straddling the freezing mark, from 21.6°F (-5.8°C) to 34°F (1.1°C). Weather in January »Weather in February
Moving into February, the weather in Hannibal slightly eases from January's chill. There's an upturn in the daylight hours that signals the creeping approach of spring. However, it remains a month of winter attributes, featuring cold temperatures and occasional snow. Weather in February »Weather in March
March signals clear changes in Hannibal's climate, distinguished by warming trends and increased rainfall. The snow that featured prominently in the previous months lightens up, giving way to rainy spells. These shifts mark the arrival of spring in Hannibal. Weather in March »Weather in April
April in Hannibal continues the trend of spring, reflected by increased temperatures and more rainfall. The city sees an end to snowfall, indicating a clear departure from winter. The blend of adequate rainfall, longer daylight hours, and emerging warmth fosters the blooming of native flora. Weather in April »Weather in May
May amounts to an amplified version of Hannibal's spring, marked by a considerable rise in temperatures and increased daylight hours. The last vestiges of winter disappear, with no trace of snowfall. Additionally, May witnesses prolific rainfall that nurtures blooming flora and paints the city with a burst of colors and vitality. Weather in May »Weather in June
As the calendar flips to June, Hannibal, Missouri transforms under the clear signs of summer, displaying increased temperatures and extended daylight. With the summer solstice, June maximizes daylight hours, allowing residents and visitors ample time to explore the city's offerings. Weather in June »Weather in July
July represents the quintessential summer month in Hannibal, featuring sunny days, high temperatures, and less rainfall. Average temperatures peak, making it the hottest month of the year. In this month, the city sees long daylight hours, allowing for more outdoor activities and events. Weather in July »Weather in August
August's weather in Hannibal mirrors July's tendencies, characterized by high temperatures and a reduction in rainfall. However, occasionally, August can deliver a few surprise showers, adding a dash of freshness to the warm days. Weather in August »Weather in September
September in Hannibal ushers in the signs of fall, as temperatures begin to cool and daylight hours decrease slightly. The absence of snowfall and moderate temperatures make September conducive for various activities. There's a balance struck between the receding warmth of summer and the heralding chill of the impending winter. Weather in September »Weather in October
October brings about marked changes in Hannibal's climate, embracing the fall season in earnest with cooling temperatures, abundant foliage, and reduced daylight hours. The characteristics of summer retreat and the month wears a distinctive autumnal look. Weather in October »Weather in November
November in Hannibal signifies a transition into colder weather and shorter days, as winter approaches. With the waning daylight hours, the chill in the air solidifies, hinting at the forthcoming freeze. The city observes a substantial drop in average temperature while rainfall decreases as well. Weather in November »Weather in December
The year ends in Hannibal with December bringing back winter's characteristics - cold temperatures, increased snowfall, and significantly less daylight. The city dons a festive look amid shorter days and longer nights. Snowfall increases from November's, making December one of the snowier months along with January. Weather in December »Updated: Aug 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January is the coldest month, with an average high-temperature of 34°F (1.1°C) and an average low-temperature of 21.6°F (-5.8°C).
January is the month with the least rainfall. Rain falls for 5.3 days and accumulates 1.14" (29mm) of precipitation.
In Hannibal, during the entire year, the rain falls for 136 days and collects up to 25" (635mm) of precipitation.
Months with snowfall are January through April, November and December.
January is the month with the most snowfall. Snow falls for 6.2 days and accumulates 3.31" (84mm) of snow.
Throughout the year, there are 20 snowfall days, and 8.5" (216mm) of snow is accumulated.
January has the least sunshine of the year in Hannibal, with an average of 4.5h of sunshine.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
The months with the highest humidity are May through July, with an average relative humidity of 80%.
May is the month with the most rainfall. Rain falls for 17.3 days and accumulates 3.39" (86mm) of precipitation.
May through October are months without snowfall.
With an average of 14h and 54min of daylight, June has the longest days of the year.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
Hannibal notes the warmest temperatures in July, with a average high of 84.7°F (29.3°C) and a low of 67.1°F (19.5°C).
With an average of 10.5h of sunshine, July has the most sunshine of the year.
With an average relative humidity of 70%, October is the least humid month.
The month with the shortest days is December, with an average of 9h and 24min of daylight.
Average temperature
Hannibal, MO
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (34°F).
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure
Hannibal, MO
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Hannibal, MO
- Average wind speed in January:
9.9mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.8mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8mph - Average wind speed in June:
7.2mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7mph - Average wind speed in October:
8.6mph - Average wind speed in November:
9.6mph - Average wind speed in December:
9.5mph
The windiest months (with the highest average wind speed) are January, February and April (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity
Hannibal, MO
The months with the highest relative humidity are May, June and July (80%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Hannibal, MO
- Average rainfall in January:
1.14" - Average rainfall in February:
1.22" - Average rainfall in March:
2.17" - Average rainfall in April:
2.6" - Average rainfall in May:
3.39" - Average rainfall in June:
2.95"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days
Hannibal, MO
- Average rainfall days in January:
5.3 days - Average rainfall days in February:
6.2 days - Average rainfall days in March:
13.2 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
17.3 days - Average rainfall days in June:
14.6 days
- Average rainfall days in July:
14.3 days - Average rainfall days in August:
12.4 days - Average rainfall days in September:
11.1 days - Average rainfall days in October:
10.8 days - Average rainfall days in November:
9.1 days - Average rainfall days in December:
6.9 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (5.3 days).
Average snowfall
Hannibal, MO
The month with the highest snowfall is January (3.31").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Hannibal, MO
- Average snowfall days in January:
6.2 days - Average snowfall days in February:
5 days - Average snowfall days in March:
2.8 days - Average snowfall days in April:
0.6 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
1.1 days - Average snowfall days in December:
4.2 days
The month with the highest number of snowfall days is January (6.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Hannibal, MO
- Average daylight in January:
9h and 42min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 24min - Average daylight in June:
14h and 54min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
4h and 30min - Average sunshine in February:
4h and 42min - Average sunshine in March:
6h and 36min - Average sunshine in April:
8h and 18min - Average sunshine in May:
9h and 18min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 6min - Average sunshine in September:
9h and 30min - Average sunshine in October:
5h and 48min - Average sunshine in November:
5h and 24min - Average sunshine in December:
4h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days
Hannibal, MO
- Average sunshine days in January:
20 days - Average sunshine days in February:
17.3 days - Average sunshine days in March:
14.8 days - Average sunshine days in April:
13.4 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
11.6 days
- Average sunshine days in July:
14 days - Average sunshine days in August:
16 days - Average sunshine days in September:
17.7 days - Average sunshine days in October:
19.3 days - Average sunshine days in November:
19 days - Average sunshine days in December:
20.3 days
The month with the most sunshine days is December (20.3 days).
The month with the least sunshine days is June (11.6 days).
Average UV index
Hannibal, MO
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Hannibal, MO
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility
Hannibal, MO
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
