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Contents
- 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
Weather in January
January, the same as December, in Merna, Illinois, is a freezing cold winter month, with an average temperature ranging between min 18.9°F (-7.3°C) and max 30.7°F (-0.7°C). The coldest time of the year is January, with temperatures averaging a high of 30.7°F (-0.7°C) and a low of 18.9°F (-7.3°C). Weather in January »
Weather in February
The last month of the winter, February, is a wintry month in Merna, Illinois, with temperature in the range of an average high of 35.6°F (2°C) and an average low of 22.5°F (-5.3°C). The commencement of February notes an average high-temperature of a cold 35.6°F (2°C), exhibiting little difference from the previous month. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Merna, Illinois, with an average temperature varying between 34°F (1.1°C) and 48.6°F (9.2°C). The beginning of March signals a rise in the average high-temperature, moving from an icy 35.6°F (2°C) in February to a frosty 48.6°F (9.2°C). Weather in March »
Weather in April
April is a moderate spring month in Merna, Illinois, with temperature in the range of an average high of 60.4°F (15.8°C) and an average low of 44.2°F (6.8°C). With the onset of April, Merna's average high-temperature experiences a rise, moving from March's chilly 48.6°F (9.2°C) to a refreshing 60.4°F (15.8°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Merna, Illinois, with temperature in the range of an average high of 72°F (22.2°C) and an average low of 55.4°F (13°C). May comes with an increase, with the average high-temperature moving from a mild 60.4°F (15.8°C) in April to an agreeable 72°F (22.2°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Merna, Illinois, with an average temperature varying between 79.3°F (26.3°C) and 63.1°F (17.3°C). As May gives way to June, the average high-temperature displays a slight ascent, adjusting from a pleasant 72°F (22.2°C) to a warm 79.3°F (26.3°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Merna, Illinois, with an average temperature varying between 64.9°F (18.3°C) and 80.8°F (27.1°C). Merna, Illinois, experiences its highest average temperatures in July, reaching a peak of 80.8°F (27.1°C) and a minimum of 64.9°F (18.3°C). July's mean heat index is evaluated at a hot 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Merna, is another warm month, with an average temperature fluctuating between 79.9°F (26.6°C) and 63.1°F (17.3°C). Merna's weather in August displays an average high-temperature of a still moderately hot 79.9°F (26.6°C), showing minor disparity from July's 80.8°F (27.1°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Merna, Illinois, with an average temperature varying between 57.4°F (14.1°C) and 75.6°F (24.2°C). The commencement of September introduces an average high-temperature of a still warm 75.6°F (24.2°C), closely mirroring the preceding month. Weather in September »
Weather in October
October, the same as September, is another comfortable autumn month in Merna, Illinois, with temperature in the range of an average low of 46.6°F (8.1°C) and an average high of 62.1°F (16.7°C). The start of October signals a decrease in the average high-temperature, transitioning from a warm 75.6°F (24.2°C) in September to a comfortable 62.1°F (16.7°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Merna, Illinois, with an average temperature varying between 34.7°F (1.5°C) and 47.7°F (8.7°C). A decrease in the average high-temperature marks November, falling from October's refreshing 62.1°F (16.7°C) to a chilly 47.7°F (8.7°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Merna, Illinois, with an average temperature varying between 36.5°F (2.5°C) and 26.1°F (-3.3°C). With the beginning of December, the average high-temperature shows a decrease, transitioning from a chilly 47.7°F (8.7°C) in November to a cold 36.5°F (2.5°C). Weather in December »
Updated: Feb 12, 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 month is the coldest in Merna?
January is the coldest month in Merna, with an average high-temperature of 30.7°F (-0.7°C) and an average low-temperature of 18.9°F (-7.3°C).
How much does it rain in Merna?
In Merna, during the entire year, the rain falls for 163.1 days and collects up to 33.62" (854mm) of precipitation.
When does it snow in Merna?
Months with snowfall are January through April, October through December.
What is the snowiest month in Merna?
The month with the most snowfall is January, when snow falls for 12.8 days and typically aggregates up to 5.04" (128mm) of snow.
How much does it snow in Merna?
Throughout the year, there are 40.7 snowfall days, and 17.01" (432mm) of snow is accumulated.
What is the month with the least sunshine in Merna?
The month with the least sunshine in Merna is January, with an average of 3.7h of sunshine.
What are the months with the lowest UV index in Merna?
The months with the lowest UV index in Merna are January, February, October through December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST) in Merna?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Merna, 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 in Merna?
May is the month with the most rainfall. Rain falls for 20.1 days and accumulates 4.57" (116mm) of precipitation.
When it does not snow in Merna?
May through September are months without snowfall.
When are the longest days in Merna?
The month with the longest days is June, with an average of 15h and 0min of daylight.
What month has the most sunshine in Merna?
June has the most sunshine of the year in Merna, with an average of 9.8h of sunshine.
What are the months with the highest UV index in Merna?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What part of the year is the hottest in Merna?
Merna, Illinois, registers the average highest temperatures during July, with peaks of 80.8°F (27.1°C) and lows of 64.9°F (18.3°C).
What is the most humid month in Merna?
July is the most humid month in Merna, Illinois, with an average relative humidity of 86%.
What is the least humid month in Merna?
The least humid month in Merna is October, with an average relative humidity of 71%.
What is the driest month in Merna?
The month with the least rainfall in Merna is December, when the rain falls for 9 days and typically collects 1.93" (49mm) of precipitation.
What is the month with the shortest days in Merna?
With an average of 9h and 18min of daylight, December has the shortest days of the year.
Average temperature
Merna, IL
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.7°F).
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure
Merna, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Merna, IL
- Average wind speed in January:
11.1mph - Average wind speed in February:
11mph - Average wind speed in March:
10.6mph - Average wind speed in April:
10.9mph - Average wind speed in May:
9.3mph - Average wind speed in June:
8mph
- Average wind speed in July:
6.7mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.7mph - Average wind speed in October:
9.9mph - Average wind speed in November:
10.6mph - Average wind speed in December:
10.6mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity
Merna, IL
The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Merna, IL
- Average rainfall in January:
1.97" - Average rainfall in February:
2.01" - Average rainfall in March:
2.56" - Average rainfall in April:
3.7" - Average rainfall in May:
4.57" - Average rainfall in June:
4.02"
- Average rainfall in July:
3.15" - Average rainfall in August:
2.68" - Average rainfall in September:
2.2" - Average rainfall in October:
2.76" - Average rainfall in November:
2.09" - Average rainfall in December:
1.93"
The wettest month (with the highest rainfall) is May (4.57").
The driest month (with the least rainfall) is December (1.93").
Average rainfall days
Merna, IL
- Average rainfall days in January:
7.2 days - Average rainfall days in February:
6.9 days - Average rainfall days in March:
13.8 days - Average rainfall days in April:
17.4 days - Average rainfall days in May:
20.1 days - Average rainfall days in June:
18.5 days
- Average rainfall days in July:
19.2 days - Average rainfall days in August:
15.9 days - Average rainfall days in September:
13.2 days - Average rainfall days in October:
12.2 days - Average rainfall days in November:
9.7 days - Average rainfall days in December:
9 days
The month with the highest number of rainy days is May (20.1 days).
The month with the least rainy days is February (6.9 days).
Average snowfall
Merna, IL
The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Merna, IL
- Average snowfall days in January:
12.8 days - Average snowfall days in February:
10.1 days - Average snowfall days in March:
4.8 days - Average snowfall days in April:
1.1 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:
0.4 days - Average snowfall days in November:
3.3 days - Average snowfall days in December:
8.2 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Merna, IL
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 4min - 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:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 1min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
9h and 2min - Average sunshine in August:
9h and 4min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 1min
The month with the most sunshine is June (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Merna, IL
- Average sunshine days in January:
13 days - Average sunshine days in February:
12.6 days - Average sunshine days in March:
12.7 days - Average sunshine days in April:
10.6 days - Average sunshine days in May:
8.4 days - Average sunshine days in June:
8.8 days
- Average sunshine days in July:
8.8 days - Average sunshine days in August:
11.8 days - Average sunshine days in September:
14.5 days - Average sunshine days in October:
16.4 days - Average sunshine days in November:
17.4 days - Average sunshine days in December:
15 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is May (8.4 days).
Average UV index
Merna, IL
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, October, November and December (UV index 2).
Average cloud cover
Merna, IL
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 33).
Average visibility
Merna, IL
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Merna, Illinois, USA
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