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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, like December, in Lerna, Illinois, is another cold winter month, with an average temperature fluctuating between 34°F (1.1°C) and 21.9°F (-5.6°C). January, marked by an average high-temperature of 34°F (1.1°C) and a low-temperature of 21.9°F (-5.6°C), is the coldest month. Weather in January »
Weather in February
February, the last month of the winter in Lerna, is also a wintry month, with an average temperature fluctuating between 26.1°F (-3.3°C) and 39°F (3.9°C). Lerna observes a minor difference in average high-temperatures between January's 34°F (1.1°C) and February's 39°F (3.9°C). Weather in February »
Weather in March
The first month of the spring, March, is a cool month in Lerna, Illinois, with an average temperature varying between 51.1°F (10.6°C) and 36.1°F (2.3°C). As March sets, the average high-temperature shows an increase, moving up from a wintry 39°F (3.9°C) in February to a cool 51.1°F (10.6°C). Weather in March »
Weather in April
April is a comfortable spring month in Lerna, Illinois, with an average temperature varying between 62.2°F (16.8°C) and 46.2°F (7.9°C). The arrival of April brings a temperature shift, with the average high-temperature escalating from a fresh 51.1°F (10.6°C) in March to a refreshing 62.2°F (16.8°C). Weather in April »
Weather in May
May, the last month of the spring in Lerna, is an agreeable month, with an average temperature fluctuating between 56.7°F (13.7°C) and 73°F (22.8°C). The arrival of May brings a change in Lerna's weather, with average high-temperatures moving from April's refreshing 62.2°F (16.8°C) to a pleasant 73°F (22.8°C). Weather in May »
Weather in June
June, the first month of the summer in Lerna, is a warm month, with an average temperature fluctuating between 64.2°F (17.9°C) and 81.1°F (27.3°C). The onset of June brings a minor temperature shift, with the average high-temperature moving from a pleasant 73°F (22.8°C) in May to a warm 81.1°F (27.3°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Lerna, Illinois, with an average temperature ranging between max 82°F (27.8°C) and min 65.8°F (18.8°C). July, with its high-temperature average of 82°F (27.8°C) and a low-temperature average of 65.8°F (18.8°C), is the warmest month. In July, the average heat index is evaluated at a tropical 89.6°F (32°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Lerna, Illinois, with an average temperature ranging between max 81.1°F (27.3°C) and min 64°F (17.8°C). As July turns into August, the average high-temperatures rest at a still moderately hot 81.1°F (27.3°C), showing a minor variation from the prior month. Weather in August »
Weather in September
September, the first month of the autumn in Lerna, is also a moderately hot month, with an average temperature ranging between max 77.2°F (25.1°C) and min 58.5°F (14.7°C). The shift into September records an average high-temperature of a still moderately hot 77.2°F (25.1°C), subtly varied from August's 81.1°F (27.3°C). Weather in September »
Weather in October
October, like September, in Lerna, Illinois, is another comfortable autumn month, with an average temperature ranging between min 48.2°F (9°C) and max 63.9°F (17.7°C). Onset of October comes with a temperature decline, the average high falling from a warm 77.2°F (25.1°C) in September to an enjoyable 63.9°F (17.7°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Lerna, Illinois, with an average temperature ranging between max 49.8°F (9.9°C) and min 36.1°F (2.3°C). With the onset of November, Lerna experiences a modest temperature adjustment, with the average high-temperature receding from a comfortable 63.9°F (17.7°C) in October to a frosty 49.8°F (9.9°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Lerna, Illinois, with temperature in the range of an average low of 28.8°F (-1.8°C) and an average high of 39°F (3.9°C). Lerna's December weather comes with a decrease in average high-temperatures, moving from a frosty 49.8°F (9.9°C) in November to an icy 39°F (3.9°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest time of year in Lerna?
In Lerna, January is the coldest month, with temperatures averaging a high of 34°F (1.1°C) and a low of 21.9°F (-5.6°C).
How many days does it rain in Lerna?
Throughout the year, in Lerna, Illinois, there are 148 rainfall days, and 25.63" (651mm) of precipitation is accumulated.
When does it snow in Lerna?
Months with snowfall in Lerna, Illinois, are January through April, October through December.
How many days does it snow in Lerna?
Throughout the year, in Lerna, there are 26.6 snowfall days, and 7.01" (178mm) of snow is accumulated.
What is the month with the least sunshine in Lerna?
January has the least sunshine of the year, with an average of 4h of sunshine.
What is the driest month in Lerna?
February is the month with the least rainfall in Lerna, Illinois. Rain falls for 7.8 days and accumulates 1.3" (33mm) of precipitation.
When is Daylight Saving Time (DST) in Lerna?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Lerna, 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 Lerna?
The month with the most rainfall in Lerna, Illinois, is April, when the rain falls for 14.9 days and typically aggregates up to 3.31" (84mm) of precipitation.
When it does not snow in Lerna?
In Lerna, snow does not fall in May through September.
When are the longest days in Lerna?
June has the longest days of the year in Lerna, with an average of 14h and 54min of daylight.
What month has the most sunshine in Lerna?
June has the most sunshine of the year, with an average of 10.3h of sunshine.
When is the highest UV index in Lerna?
June through August, with an average maximum UV index of 6, are months with the highest UV index in Lerna, Illinois.
What are the warmest months in Lerna?
July is the month when Lerna's temperatures reach their peak, with averages of 82°F (27.8°C) and lows of 65.8°F (18.8°C).
What is the most humid month in Lerna?
The most humid month in Lerna is July, with an average relative humidity of 83%.
What is the least humid month in Lerna?
With an average relative humidity of 70%, October is the least humid month.
When does it snow the most in Lerna?
The month with the most snowfall in Lerna is December, when snow falls for 6 days and typically aggregates up to 2.13" (54mm) of snow.
What is the month with the shortest days in Lerna?
The month with the shortest days in Lerna, Illinois, is December, with an average of 9h and 24min of daylight.
What is the month with the lowest UV index in Lerna?
With an average maximum UV index of 1, December is the month with the lowest UV index in Lerna, Illinois.
Average temperature
Lerna, IL
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (34°F).
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure
Lerna, IL
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.93"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:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Lerna, IL
- Average wind speed in January:
10.7mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.4mph - Average wind speed in May:
8.6mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.1mph - Average wind speed in October:
9.2mph - Average wind speed in November:
9.9mph - Average wind speed in December:
9.9mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity
Lerna, IL
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Lerna, IL
- Average rainfall in January:
1.81" - Average rainfall in February:
1.3" - Average rainfall in March:
2.09" - Average rainfall in April:
3.31" - Average rainfall in May:
2.87" - Average rainfall in June:
2.76"
- Average rainfall in July:
2.52" - Average rainfall in August:
2.28" - Average rainfall in September:
1.38" - Average rainfall in October:
2.13" - Average rainfall in November:
1.61" - Average rainfall in December:
1.57"
The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is February (1.3").
Average rainfall days
Lerna, IL
- Average rainfall days in January:
8.2 days - Average rainfall days in February:
7.8 days - Average rainfall days in March:
12.5 days - Average rainfall days in April:
14.9 days - Average rainfall days in May:
16.8 days - Average rainfall days in June:
15.6 days
- Average rainfall days in July:
16.6 days - Average rainfall days in August:
14.3 days - Average rainfall days in September:
12.1 days - Average rainfall days in October:
11.1 days - Average rainfall days in November:
8.7 days - Average rainfall days in December:
9.4 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (7.8 days).
Average snowfall
Lerna, IL
The month with the highest snowfall is December (2.13").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Lerna, IL
- Average snowfall days in January:
8.1 days - Average snowfall days in February:
6.8 days - Average snowfall days in March:
3.2 days - Average snowfall days in April:
0.7 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:
1.7 days - Average snowfall days in December:
6 days
The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Lerna, IL
- Average daylight in January:
9h and 5min - 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 2min - Average daylight in June:
14h and 5min
- 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:
10h and 0min - Average daylight in December:
9h and 2min
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 0min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 5min - Average sunshine in September:
8h and 5min - Average sunshine in October:
6h and 2min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Lerna, IL
- Average sunshine days in January:
15.9 days - Average sunshine days in February:
14 days - Average sunshine days in March:
15.2 days - Average sunshine days in April:
12.9 days - Average sunshine days in May:
11.2 days - Average sunshine days in June:
11.5 days
- Average sunshine days in July:
10.6 days - Average sunshine days in August:
12.7 days - Average sunshine days in September:
15.7 days - Average sunshine days in October:
18.3 days - Average sunshine days in November:
17.9 days - Average sunshine days in December:
16.9 days
The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is July (10.6 days).
Average UV index
Lerna, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Lerna, IL
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 31).
Average visibility
Lerna, IL
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Lerna, Illinois, USA
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