January weather forecast
Monticello, IA

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Weather in January

January, like December, is a freezing cold winter month in Monticello, Iowa, with an average temperature ranging between max 25.2°F (-3.8°C) and min 13.3°F (-10.4°C).

Temperature

Monticello's January weather, with an average high temperature of 25.2°F (-3.8°C) and an average low temperature of 13.3°F (-10.4°C), tends to be the coldest of the year.

Humidity

January and February, with an average relative humidity of 86%, are the most humid months.

Rainfall

January and February are months with the least rain when the rain falls for 5.2 days and typically aggregates up to 1.26" (32mm) of rain.

Snowfall

Months with snowfall are January through April, October through December. The month with the most snowfall is January, when snow falls for 12.1 days and typically aggregates up to 5.04" (128mm) of snow.

Daylight

The average length of the day in January is 9h and 31min.
On the first day of January, sunrise is at 7:33 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 5:17 pm CST.

Sunshine

The month with the least sunshine is January, with an average of 3.8h of sunshine.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high daily UV index of 1 during January translates into the following directions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Updated: Aug 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

January, with an average high of 25.2°F (-3.8°C) and a low of 13.3°F (-10.4°C), signifies the coldest month of the year.

How cold is it in January?

The high-temperature, in January, in Monticello, records 25.2°F (-3.8°C), while the low-temperature is 13.3°F (-10.4°C).

What is the most humid month?

The months with the highest humidity are January and February, with an average relative humidity of 86%.

What is the average humidity in January in Monticello?

In Monticello, the average relative humidity in January is 86%.

What is the driest month?

The months with the least rainfall are January and February Rain falls for 5.2 days and accumulates 1.26" (32mm) of rain.

How many days does it rain in January?

In Monticello, in January, it is raining for 5.2 days, with typically 1.26" (32mm) of accumulated precipitation.

When does it snow the most?

January is the month with the most snowfall. Snow falls for 12.1 days and accumulates 5.04" (128mm) of snow.

How many days does it snow in January?

In Monticello, in January, snow falls for 12.1 days, with typically accumulated 5.04" (128mm) of snow.

What is the average length of the day in January?

The average day length in January is 9h and 31min.

When is the sunrise / sunset in January?

On the first day of January, sunrise is at 7:33 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 5:17 pm CST.

What is the month with the least sunshine?

With an average of 3.8h of sunshine, January has the least sunshine of the year.

How many hours of sunshine does Monticello have in January?

In Monticello, the average sunshine duration in January is 3.8h.

What are the months with the lowest UV index?

January and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index reading in January in Monticello?

In January, the average daily maximum UV index in Monticello is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Monticello, IA

Average temperature in January - Monticello, IA
  • Average high temperature in January: 25.2°F

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (25.2°F).

  • Average low temperature in January: 13.3°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).

Average pressure in January
Monticello, IA

Average pressure in January - Monticello, IA
  • 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 (29.9"Hg).

Average wind speed in January
Monticello, IA

Average wind speed in January - Monticello, IA
  • Average wind speed in January: 10.4mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).

Average humidity in January
Monticello, IA

Average humidity in January - Monticello, IA
  • Average humidity in January: 86%

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is October (74%).

Average rainfall in January
Monticello, IA

Average rainfall in January - Monticello, IA
  • Average rainfall in January: 1.26"

The wettest month (with the highest rainfall) is May (4.25").
The driest months (with the least rainfall) are January and February (1.26").

Average rainfall days in January
Monticello, IA

Average rainfall days in January - Monticello, IA
  • Average rainfall days in January: 5.2 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (5.2 days).

Average snowfall in January
Monticello, IA

Average snowfall in January - Monticello, IA
  • 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").

Average snowfall days in January
Monticello, IA

Average snowfall days in January - Monticello, IA
  • Average snowfall days in January: 12.1 days

The month with the highest number of snowfall days is January (12.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in January /
Average sunshine in January
Monticello, IA

Average daylight in January / Average sunshine in January - Monticello, IA
  • Average daylight in January: 9h and 3min

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

  • Average sunshine in January: 3h and 5min

The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in January
Monticello, IA

Average sunshine days in January - Monticello, IA
  • Average sunshine days in January: 15.8 days

The month with the most sunshine days is September (17 days).
The month with the least sunshine days is June (10.5 days).

Average UV index in January
Monticello, IA

Average UV index in January - Monticello, IA
  • Average UV index in January: 1

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in January
Monticello, IA

Average cloud cover in January - Monticello, IA
  • Average cloud cover in January: 60

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in January
Monticello, IA

Average visibility in January - Monticello, IA
  • Average visibility in January: 5mi

The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).

Monticello, Iowa, USA

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