January weather forecast
Port Byron, IL

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Weather in January

January, like December, is another subzero cold winter month in Port Byron, Illinois, with an average temperature fluctuating between 28.2°F (-2.1°C) and 15.4°F (-9.2°C).

Temperature

Port Byron records the coldest temperatures in January, averaging a high of 28.2°F (-2.1°C) and a low of 15.4°F (-9.2°C).

Humidity

January and July, with an average relative humidity of 83%, are the most humid months in Port Byron.

Rainfall

In Port Byron, Illinois, during January, the rain falls for 3.2 days and regularly aggregates up to 0.43" (11mm) of precipitation. Throughout the year, in Port Byron, there are 99.4 rainfall days, and 9.57" (243mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, September through December. January is the month with the most snowfall in Port Byron. Snow falls for 7.2 days and accumulates 1.26" (32mm) of snow.

Daylight

The average length of the day in January in Port Byron is 9h and 34min.
On the first day of the month, sunrise is at 7:28 am and sunset at 4:41 pm. On the last day of January, in Port Byron, sunrise is at 7:14 am and sunset at 5:15 pm CST.

Sunshine

The month with the least sunshine in Port Byron is January, with an average of 3.9h of sunshine.

UV index

January is the month with the lowest UV index in Port Byron, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for average individuals.
Note: In January, a regular UV index of 1 translates into these guidelines:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Enhance your sun protection with tightly woven, yet airy clothing. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
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Frequently asked questions

What is the coldest time of year in Port Byron?

Port Byron's coldest temperatures are experienced in January, with average high temperatures of 28.2°F (-2.1°C) and lows of 15.4°F (-9.2°C).

How cold is it in Port Byron in January?

In Port Byron, 28.2°F (-2.1°C) is the average high-temperature and 15.4°F (-9.2°C) is the average low-temperature during January.

What are the most humid months in Port Byron?

The months with the highest humidity in Port Byron, Illinois, are January and July, with an average relative humidity of 83%.

What is the average humidity in January in Port Byron?

The average relative humidity in January in Port Byron is 83%.

How much does it rain in Port Byron in January?

In Port Byron, Illinois, during January, the rain falls for 3.2 days and regularly aggregates up to 0.43" (11mm) of precipitation.

When does it snow the most in Port Byron?

January is the month with the most snowfall in Port Byron. Snow falls for 7.2 days and accumulates 1.26" (32mm) of snow.

How much does it snow in Port Byron in January?

In Port Byron, Illinois, in January, during 7.2 snowfall days, 1.26" (32mm) of snow is typically accumulated.

What is the average length of the day in January in Port Byron?

In January, the average day length in Port Byron, Illinois, is 9h and 34min.

When are sunrise and sunset in January in Port Byron?

On the first day of January, sunrise is at 7:28 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 5:15 pm CST.

What is the month with the least sunshine in Port Byron?

With an average of 3.9h of sunshine, January has the least sunshine of the year in Port Byron.

How many hours of sunshine does Port Byron have in January?

In January, the average sunshine duration in Port Byron, Illinois, is 3.9h.

What is the month with the lowest UV index in Port Byron?

With an average maximum UV index of 1, January is the month with the lowest UV index in Port Byron, Illinois.

What is the UV index intensity in January in Port Byron?

The average daily maximum UV index in January in Port Byron is 1. A UV Index estimate of 2, and below, represents a low health threat from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
34.5°F 1.4°C
28.2°F -2.1°C
32.7°F 0.4°C
Average low temperature
23.9°F -4.5°C
15.4°F -9.2°C
19.6°F -6.9°C
Average pressure
30.11" 765mmHg
30.13" 765mmHg
30.12" 765mmHg
Average wind speed
9.8mph 15.8km/h
10.3mph 16.6km/h
10.4mph 16.7km/h
Average max. wind speed
10.4mph 16.7km/h
11mph 17.7km/h
11mph 17.7km/h
Average wind speed gusts
15.7mph 25.3km/h
16.5mph 26.6km/h
16.3mph 26.2km/h
Average humidity
81%
83%
82%
Average rainfall
0.35" 9mm
0.43" 11mm
0.39" 10mm
Average rainfall days
4.1
3.2
3.3
Average snowfall
0.39" 10mm
1.26" 32mm
0.94" 24mm
Average snowfall days
5
7.2
6.2
Average daylight
9h 1min
9h 4min
10h 4min
Average sunshine
4h 1min
3h 5min
4h 1min
Average sunshine days
22.4
22.2
19.5
Average UV index
2
1
2
Average cloud cover
56%
58%
56%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
Port Byron, IL

Average temperature in January - Port Byron, IL
  • Average high temperature in January: 28.2°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.2°F).

  • Average low temperature in January: 15.4°F

The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (15.4°F).

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Average pressure in January
Port Byron, IL

Average pressure in January - Port Byron, IL
  • Average pressure in January: 30.13"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in January
Port Byron, IL

Average wind speed in January - Port Byron, IL
  • Average wind speed in January: 10.3mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).

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Average humidity in January
Port Byron, IL

Average humidity in January - Port Byron, IL
  • Average humidity in January: 83%

The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in January
Port Byron, IL

Average rainfall in January - Port Byron, IL
  • Average rainfall in January: 0.43"

The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is December (0.35").

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Average rainfall days in January
Port Byron, IL

Average rainfall days in January - Port Byron, IL
  • Average rainfall days in January: 3.2 days

The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is January (3.2 days).

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Average snowfall in January
Port Byron, IL

Average snowfall in January - Port Byron, IL
  • Average snowfall in January: 1.26"

The month with the highest snowfall is January (1.26").
The months with the least snowfall are May, June, July and August (0").

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Average snowfall days in January
Port Byron, IL

Average snowfall days in January - Port Byron, IL
  • Average snowfall days in January: 7.2 days

The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are May, June, July and August (0 days).

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Average daylight in January /
Average sunshine in January
Port Byron, IL

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

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in January: 3h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

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Average sunshine days in January
Port Byron, IL

Average sunshine days in January - Port Byron, IL
  • Average sunshine days in January: 22.2 days

The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is June (14.4 days).

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Average UV index in January
Port Byron, IL

Average UV index in January - Port Byron, IL
  • Average UV index in January: 1

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in January
Port Byron, IL

Average cloud cover in January - Port Byron, IL
  • Average cloud cover in January: 58

The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).

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Average visibility in January
Port Byron, IL

Average visibility in January - Port Byron, IL
  • Average visibility in January: 6mi

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).

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Port Byron, Illinois, USA

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