January weather forecast
Herndon, IA

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Weather in January

January, like December, is a freezing cold winter month in Herndon, Iowa, with temperature in the range of an average low of 13.5°F (-10.3°C) and an average high of 26.8°F (-2.9°C).

Temperature

In Herndon, the lowest average temperatures are observed in January, with a high of 26.8°F (-2.9°C) and a low of 13.5°F (-10.3°C).

Humidity

The most humid month in Herndon is January, with an average relative humidity of 84%.

Rainfall

January is the month with the least rainfall in Herndon. Rain falls for 3.8 days and accumulates 0.87" (22mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. January is the month with the most snowfall. Snow falls for 9.8 days and accumulates 4.29" (109mm) of snow.

Daylight

In January, the average length of the day in Herndon is 9h and 33min.
On the first day of the month, sunrise is at 7:44 am and sunset at 4:56 pm. On the last day of January, sunrise is at 7:30 am and sunset at 5:30 pm CST.

Sunshine

With an average of 4.2h of sunshine, January has the least sunshine of the year in Herndon.

UV index

January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Herndon. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 2 in January translates into these instructions:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
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Frequently asked questions

What part of the year is the coldest in Herndon?

January brings the lowest temperatures in Herndon, with an average high of 26.8°F (-2.9°C) and an average low of 13.5°F (-10.3°C).

How cold is it in Herndon in January?

Herndon in January has an average high-temperature of 26.8°F (-2.9°C) and an average low-temperature of 13.5°F (-10.3°C).

What is the most humid month in Herndon?

The most humid month in Herndon, Iowa, is January, with an average relative humidity of 84%.

What is the average humidity in January in Herndon?

In January, the average relative humidity is 84%.

What is the driest month in Herndon?

The month with the least rainfall in Herndon is January, when the rain falls for 3.8 days and typically collects 0.87" (22mm) of precipitation.

How much does it rain in Herndon in January?

In Herndon, during January, the rain falls for 3.8 days and regularly aggregates up to 0.87" (22mm) of precipitation.

What is the snowiest month in Herndon?

The month with the most snowfall in Herndon, Iowa, is January, when snow falls for 9.8 days and typically aggregates up to 4.29" (109mm) of snow.

How much does it snow in Herndon in January?

In Herndon, in January, during 9.8 snowfall days, 4.29" (109mm) of snow is typically accumulated.

What is the average length of the day in January in Herndon?

In Herndon, Iowa, the average day length in January is 9h and 33min.

When are sunrise and sunset in January in Herndon?

In January, on the first day of the month, sunrise is at 7:44 am and sunset at 4:56 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 5:30 pm CST.

What is the month with the least sunshine in Herndon?

January has the least sunshine of the year, with an average of 4.2h of sunshine.

How long on average sun shines in January in Herndon?

In Herndon, Iowa, the average sunshine duration in January is 4.2h.

When is the lowest UV index in Herndon?

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

What is the UV index reading in January in Herndon?

The average daily maximum UV index in January in Herndon, Iowa, is 2. A UV Index estimate of 2, and below, represents a low health threat 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
Herndon, IA

Average temperature in January - Herndon, IA
  • Average high temperature in January: 26.8°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (26.8°F).

  • Average low temperature in January: 13.5°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).

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Average pressure in January
Herndon, IA

Average pressure in January - Herndon, IA
  • Average pressure in January: 30.16"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in January
Herndon, IA

Average wind speed in January - Herndon, IA
  • Average wind speed in January: 10.6mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).

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Average humidity in January
Herndon, IA

Average humidity in January - Herndon, IA
  • Average humidity in January: 84%

The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (69%).

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Average rainfall in January
Herndon, IA

Average rainfall in January - Herndon, IA
  • Average rainfall in January: 0.87"

The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is January (0.87").

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Average rainfall days in January
Herndon, IA

Average rainfall days in January - Herndon, IA
  • Average rainfall days in January: 3.8 days

The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (3.4 days).

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Average snowfall in January
Herndon, IA

Average snowfall in January - Herndon, IA
  • Average snowfall in January: 4.29"

The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Herndon, IA

Average snowfall days in January - Herndon, IA
  • Average snowfall days in January: 9.8 days

The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in January / Average sunshine in January - Herndon, IA
  • Average daylight in January: 9h and 4min

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: 4h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

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Average sunshine days in January
Herndon, IA

Average sunshine days in January - Herndon, IA
  • Average sunshine days in January: 18.1 days

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (11.1 days).

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Average UV index in January
Herndon, IA

Average UV index in January - Herndon, IA
  • Average UV index in January: 2

The months with the highest UV index are June and July (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
Herndon, IA

Average cloud cover in January - Herndon, IA
  • Average cloud cover in January: 55

The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).

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Average visibility in January
Herndon, IA

Average visibility in January - Herndon, IA
  • 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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Herndon, Iowa, USA

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