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Contents
- The climate of Marion
- The best time to visit Marion
- The worst time to visit Marion
- Spring weather in Marion
- Summer weather in Marion
- Autumn weather in Marion
- Winter weather in Marion
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Marion
Marion, situated in Illinois, United States, is governed by the Cfa Köppen climate classification or the Humid subtropical, no dry season category. Throughout the year, its climate sways broadly from moderately chilly to quite warm temperatures. An abundance of rainfall marks the months, somewhat more concentrated in the middle year.
On a monthly average, temperatures in Marion fluctuate between 26.1°F (-3.3°C) and 87.4°F (30.8°C). December and January witness the lowest temperatures going down to 26.1°F (-3.3°C) and 31.8°F (-0.1°C) respectively, whereas the heat soars to its highest at 87.4°F (30.8°C) in July and 85.6°F (29.8°C) in August. The relative humidity hovers around the 70s percentage, contributing to the overall humidity levels of the town.
Rainfall measures albeit consistently, more precipitation occurs from between March to June, the amount varying from 2.09" (53mm) to 3.11" (79mm). Snowfall is more apparent from December to February with measurements ranging from 0.47" (12mm) to 0.94" (24mm). Daylight hours expand and contract between approximately 9.9 hours in December and 14.7 hours in June. Sunshine hours also see a variation, though an average of 6 hours of sunshine per day prevails across the year.
On a monthly average, temperatures in Marion fluctuate between 26.1°F (-3.3°C) and 87.4°F (30.8°C). December and January witness the lowest temperatures going down to 26.1°F (-3.3°C) and 31.8°F (-0.1°C) respectively, whereas the heat soars to its highest at 87.4°F (30.8°C) in July and 85.6°F (29.8°C) in August. The relative humidity hovers around the 70s percentage, contributing to the overall humidity levels of the town.
Rainfall measures albeit consistently, more precipitation occurs from between March to June, the amount varying from 2.09" (53mm) to 3.11" (79mm). Snowfall is more apparent from December to February with measurements ranging from 0.47" (12mm) to 0.94" (24mm). Daylight hours expand and contract between approximately 9.9 hours in December and 14.7 hours in June. Sunshine hours also see a variation, though an average of 6 hours of sunshine per day prevails across the year.
The best time to visit Marion
A favourable time to plan a visit to Marion would be from May to September. This period sees moderate temperatures ranging between 66.4°F (19.1°C) to 85.6°F (29.8°C), with reasonable humidity levels. Sunshine hours peak at 10.5 hours per day in June and July, hinting at long, pleasant days. Rainfall also takes a slight dip during these months, ensuring outdoor activities are not spoilt by unexpected showers.
The worst time to visit Marion
The least appropriate time to explore Marion would be the winter months of December, January and February. The severe cold, with temperature dipping down to 26.1°F (-3.3°C) in January, the decreased sunshine hours, and the increased snowfall with measurements of up to 0.94" (24mm) in December and January make these months less inviting for outdoor exploration and leisure activities.
Spring weather in Marion
Spring in Marion sees a significant climb in temperatures from the winter lows. From March to May, the temperatures rise gradually ranging from 55.2°F (12.9°C) to 75.4°F (24.1°C). The rainfall and humidity remain moderate yet constant, and daylight extends to up to 14.2 hours in May, offering longer daylight hours for activities.
Summer weather in Marion
Summers in Marion, from June to August, are marked by the warmest temperatures of the year varying between 84.7°F (29.3°C) to 87.4°F (30.8°C). However, the humidity is not at its highest during these months, thereby easing the discomfort associated with high temperatures.
Autumn weather in Marion
Autumn in Marion, from September to November, witnesses a steady decline in temperatures from 80.8°F (27.1°C) to 53.8°F (12.1°C). The rainfall stays consistent but the humidity starts to rise gradually.
Winter weather in Marion
Winters in Marion from December through February, are associated with the lowest temperatures of the year, these falling to as low as 26.1°F (-3.3°C) in January. The occurrence of snowfall during these months, coupled with limited daylight of approximately 9 to 10 hours, contribute to the overall bleak winter experience in Marion, Illinois.
Weather in January
January in Marion, Illinois, is characterized by chilly temperatures and the possibility of both rain and snow. The month begins the year on a cold note with high temperatures averaging 39.6°F (4.2°C) and lows hitting an average of 26.1°F (-3.3°C). Weather in January »
Weather in February
February in Marion still holds wintry conditions, though the cold lessens slightly compared to January. The month features an average high temperature of 43.7°F (6.5°C) and an average low of 29.8°F (-1.2°C), indicating a subtle rise in thermal readings. Weather in February »
Weather in March
March signals the arrival of Spring in Marion with a noticeable rise in temperatures. There is a significant increase in average highs, jumping to 55.2°F (12.9°C), and lows escalating to 38.8°F (3.8°C). The variation in temperature accompanies a higher rate of rainfall, contributing to the growth of blooms. Weather in March »
Weather in April
Temperatures continue to climb in Marion during April, indicating a full swing of spring. The city experiences an impressive leap in temperatures with high averages reaching 66.4°F (19.1°C) and lows rising to 48.7°F (9.3°C). April shows a blend of spring showers and lengthening daylight hours, encouraging outdoor activities. Weather in April »
Weather in May
May marks the advent of summer season in Marion, Illinois, with a considerable rise in temperature. The mercury even climbs to an average high of 75.4°F (24.1°C) while the lows stop at 58.1°F (14.5°C), making the days appreciably warm. Weather in May »
Weather in June
Summer is in full effect during June in Marion, boasting the longest daylight hours of the year. The average temperatures rise to become the highest of the year, with the high averaging 84.7°F (29.3°C) and lows around 66.4°F (19.1°C). Weather in June »
Weather in July
July is the peak of summer in Marion, holding the record for the highest average temperatures of the year. The city witnesses the warmest conditions with average high temperatures achieving 87.4°F (30.8°C) and lows mildly reducing to 68.5°F (20.3°C). Weather in July »
Weather in August
In Marion, August continues the summer's warmth but hints at the coming fall season. The temperature remains considerably high, with an average high and low of 85.6°F (29.8°C) and 66.4°F (19.1°C) respectively. The month maintains a balance between high temperatures and relative humidity, presenting occasional muggy days. Weather in August »
Weather in September
September in Marion, Illinois, marks the arrival of the fall season with a significant drop in temperature. The averages take a plunge from the highs of summer to 80.8°F (27.1°C) and the lows to 60.4°F (15.8°C). The shift to fall is evident with cooler temperatures and reduced daylight hours. Weather in September »
Weather in October
October brings cooler autumnal weather to Marion, with an evident decrease in temperature. The mild autumn month witnesses averages falling to 67.3°F (19.6°C) at their highest and 49.3°F (9.6°C) at their lowest. Transitioning from September to October, the noticeable reduction in daylight hours symbolizes the approaching winter. Weather in October »
Weather in November
In Marion, November is the transition month from fall to winter, characterized by dropping temperatures. The change reflects in average highs and lows, both dropping to 53.8°F (12.1°C) and 38.5°F (3.6°C), respectively. With shorter daylight hours and decreased sunshine duration, the signs of winter start to show. Weather in November »
Weather in December
December in Marion caps off the year with the coldest temperatures and potential snowfall. The month experiences the lowest temperatures of the year, with averages falling to 43.9°F (6.6°C) and 31.8°F (-0.1°C), for highs and lows respectively. Weather in December »
Updated: Jul 25, 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
What is the coldest time of year?
The month of January sees the average lowest temperatures, reaching 39.6°F (4.2°C) at the peak and 26.1°F (-3.3°C) at the low.
How many days does it rain?
In Marion, during the entire year, the rain falls for 137.6 days and collects up to 23.03" (585mm) of precipitation.
When does it snow?
Months with snowfall are January through April, October through December.
What is the snowiest month?
The months with the most snowfall are January and February, with an average 0.94" (24mm) of accumulated snow.
How many days does it snow in Marion?
Throughout the year, there are 14.5 snowfall days, and 4.13" (105mm) of snow is accumulated.
What is the month with the least sunshine?
With an average of 4.6h of sunshine, January has the least sunshine of the year.
What are the months with the lowest UV index?
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.
When is Daylight Saving Time (DST)?
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.
What is the wettest month?
The month with the most rainfall is April, when the rain falls for 13.8 days and typically aggregates up to 3.11" (79mm) of precipitation.
What is the most humid month?
May is the most humid month, with an average relative humidity of 79%.
When it does not snow?
May through September are months without snowfall.
What is the month with the highest UV index?
The months with the highest UV index are May through August, with an average maximum UV index of 6.
When are the longest days?
With an average of 14h and 42min of daylight, June has the longest days of the year.
What are the months with the most sunshine?
The months with the most sunshine are June and July, with an average of 10.5h of sunshine.
What part of the year is the hottest?
The warmest time of the year is July, with temperatures averaging a high of 87.4°F (30.8°C) and a low of 68.5°F (20.3°C).
What is the driest month?
The month with the least rainfall is September, when the rain falls for 10.5 days and typically collects 1.1" (28mm) of precipitation.
What is the least humid month?
With an average relative humidity of 71%, October is the least humid month.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 36min of daylight.
Average temperature
Marion, IL
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°F).
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure
Marion, IL
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed
Marion, IL
- Average wind speed in January:
9.4mph - Average wind speed in February:
9.4mph - Average wind speed in March:
9.3mph - Average wind speed in April:
9.1mph - Average wind speed in May:
7.6mph - Average wind speed in June:
6.6mph
- Average wind speed in July:
5.8mph - Average wind speed in August:
5.8mph - Average wind speed in September:
6.3mph - Average wind speed in October:
8.1mph - Average wind speed in November:
8.6mph - Average wind speed in December:
8.8mph
The windiest months (with the highest average wind speed) are January and February (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity
Marion, IL
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Marion, IL
- Average rainfall in January:
1.42" - Average rainfall in February:
1.65" - Average rainfall in March:
2.09" - Average rainfall in April:
3.11" - Average rainfall in May:
2.52" - Average rainfall in June:
2.13"
- Average rainfall in July:
2.09" - Average rainfall in August:
1.89" - Average rainfall in September:
1.1" - Average rainfall in October:
1.89" - Average rainfall in November:
1.69" - Average rainfall in December:
1.46"
The wettest month (with the highest rainfall) is April (3.11").
The driest month (with the least rainfall) is September (1.1").
Average rainfall days
Marion, IL
- Average rainfall days in January:
8.8 days - Average rainfall days in February:
9.1 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
13.8 days - Average rainfall days in May:
15.1 days - Average rainfall days in June:
13.3 days
- Average rainfall days in July:
15.3 days - Average rainfall days in August:
13.5 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
8.5 days - Average rainfall days in November:
7.8 days - Average rainfall days in December:
9.1 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (7.8 days).
Average snowfall
Marion, IL
The months with the highest snowfall are January and February (0.94").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Marion, IL
- Average snowfall days in January:
4.1 days - Average snowfall days in February:
4.3 days - Average snowfall days in March:
1.8 days - Average snowfall days in April:
0.5 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:
0.2 days - Average snowfall days in November:
0.9 days - Average snowfall days in December:
2.7 days
The month with the highest number of snowfall days is February (4.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Marion, IL
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 3min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
4h and 4min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 4min - Average sunshine in May:
9h and 1min - Average sunshine in June:
10h and 3min
- Average sunshine in July:
10h and 3min - Average sunshine in August:
10h and 2min - Average sunshine in September:
9h and 2min - Average sunshine in October:
6h and 3min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days
Marion, IL
- Average sunshine days in January:
18.1 days - Average sunshine days in February:
14.8 days - Average sunshine days in March:
14.9 days - Average sunshine days in April:
13.7 days - Average sunshine days in May:
13.3 days - Average sunshine days in June:
13.3 days
- Average sunshine days in July:
12.9 days - Average sunshine days in August:
14.9 days - Average sunshine days in September:
17.5 days - Average sunshine days in October:
20.6 days - Average sunshine days in November:
19.9 days - Average sunshine days in December:
18.6 days
The month with the most sunshine days is October (20.6 days).
The month with the least sunshine days is July (12.9 days).
Average UV index
Marion, IL
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover
Marion, IL
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are June, August and September (Cloud cover 28).
Average visibility
Marion, IL
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).
Marion, Illinois, USA
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