January weather forecast
Merna, IL

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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).

Temperature

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).

Humidity

The average relative humidity in January in Merna is 81%.

Rainfall

In January, in Merna, the rain falls for 7.2 days. Throughout January, 1.97" (50mm) of precipitation is accumulated. In Merna, during the entire year, the rain falls for 163.1 days and collects up to 33.62" (854mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. 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.

Daylight

The average length of the day in January in Merna is 9h and 40min.
On the first day of the month, sunrise is at 7:18 am and sunset at 4:38 pm. On the last day of January, sunrise is at 7:05 am and sunset at 5:11 pm CST.

Sunshine

With an average of 3.7h of sunshine, January has the least sunshine of the year in Merna.

UV index

January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Merna. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A typical high UV index of 2 in January suggests the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. To avoid the Sun's strongest rays, limit exposure around the mid-day period. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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Frequently asked questions

What month is the coldest in Merna?

January is the coldest month in Merna, Illinois, 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 cold is it in Merna in January?

The average high-temperature, in January, in Merna, is 30.7°F (-0.7°C), while the average low-temperature is 18.9°F (-7.3°C).

What is the average humidity in January in Merna?

In Merna, Illinois, the average relative humidity in January is 81%.

How many days does it rain in January in Merna?

In January, in Merna, the rain falls for 7.2 days. Throughout January, 1.97" (50mm) of precipitation is accumulated.

What is the snowiest month in Merna?

The month with the most snowfall in Merna, Illinois, is January, when snow falls for 12.8 days and typically aggregates up to 5.04" (128mm) of snow.

How many days does it snow in January in Merna?

In Merna, during January, snow falls for 12.8 days and regularly aggregates up to 5.04" (128mm) of snow.

How many hours of daylight does Merna have in January?

In January, the average day length is 9h and 40min.

When is the sunrise / sunset in January in Merna?

In January, on the first day of the month, sunrise is at 7:18 am and sunset at 4:38 pm. On the last day of the month, in Merna, sunrise is at 7:05 am and sunset at 5:11 pm CST.

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.

How long on average sun shines in January in Merna?

The average sunshine duration in January in Merna, Illinois, is 3.7h.

What are the months with the lowest UV index in Merna?

The months with the lowest UV index in Merna, Illinois, are January, February, October through December, with an average maximum UV index of 2.

What is the UV index reading in January in Merna?

In Merna, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
36.5°F 2.5°C
30.7°F -0.7°C
35.6°F 2°C
Average low temperature
26.1°F -3.3°C
18.9°F -7.3°C
22.5°F -5.3°C
Average pressure
30.11" 765mmHg
30.14" 766mmHg
30.11" 765mmHg
Average wind speed
10.6mph 17.1km/h
11.1mph 17.9km/h
11mph 17.7km/h
Average max. wind speed
11.2mph 18km/h
11.9mph 19.2km/h
11.7mph 18.8km/h
Average wind speed gusts
16.2mph 26.1km/h
17mph 27.4km/h
16.8mph 27km/h
Average humidity
80%
81%
81%
Average rainfall
1.93" 49mm
1.97" 50mm
2.01" 51mm
Average rainfall days
9
7.2
6.9
Average snowfall
2.64" 67mm
5.04" 128mm
4.33" 110mm
Average snowfall days
8.2
12.8
10.1
Average daylight
9h 2min
9h 4min
10h 4min
Average sunshine
4h 1min
3h 4min
4h 0min
Average sunshine days
15
13
12.6
Average UV index
2
2
2
Average cloud cover
56%
60%
58%
Average visibility
6mi 9.7km
5mi 8km
6mi 9.7km

Average temperature in January
Merna, IL

Average temperature in January - Merna, IL
  • Average high temperature in January: 30.7°F

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).

  • Average low temperature in January: 18.9°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).

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Average pressure in January
Merna, IL

Average pressure in January - Merna, IL
  • Average pressure in January: 30.14"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).

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Average wind speed in January
Merna, IL

Average wind speed in January - Merna, IL
  • Average wind speed in January: 11.1mph

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).

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Average humidity in January
Merna, IL

Average humidity in January - Merna, IL
  • Average humidity in January: 81%

The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in January
Merna, IL

Average rainfall in January - Merna, IL
  • Average rainfall in January: 1.97"

The wettest month (with the highest rainfall) is May (4.57").
The driest month (with the least rainfall) is December (1.93").

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Average rainfall days in January
Merna, IL

Average rainfall days in January - Merna, IL
  • Average rainfall days in January: 7.2 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).

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Average snowfall in January
Merna, IL

Average snowfall in January - Merna, IL
  • Average snowfall in January: 5.04"

The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in January
Merna, IL

Average snowfall days in January - Merna, IL
  • Average snowfall days in January: 12.8 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).

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Average daylight in January /
Average sunshine in January
Merna, IL

Average daylight in January / Average sunshine in January - Merna, IL
  • Average daylight in January: 9h and 4min

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

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).

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Average sunshine days in January
Merna, IL

Average sunshine days in January - Merna, IL
  • Average sunshine days in January: 13 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).

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Average UV index in January
Merna, IL

Average UV index in January - Merna, IL
  • Average UV index in January: 2

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).

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Average cloud cover in January
Merna, IL

Average cloud cover in January - Merna, IL
  • Average cloud cover in January: 60

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).

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Average visibility in January
Merna, IL

Average visibility in January - Merna, IL
  • Average visibility in January: 5mi

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).

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Merna, Illinois, USA

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