December weather forecast
Jerome, ID

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The high rocks around the Snake River near the iconic Shoshone Falls in Jerome County, Idaho
The high rocks around the Snake River near the iconic Shoshone Falls in Jerome County, Idaho

Weather in December

December, the final month of the year, brings true winter conditions to Jerome, Idaho. The shift from November’s milder winter weather to December's biting cold is marked by a drop in temperatures. December has a significant snowfall of 6.14" (156mm) over almost 11 days, painting a typical winter landscape. Despite the cold and snow, December is recognized for holiday cheer, snowy landscapes, and preparations for a fresh new year. The icy wind beckons the return of January’s stringent winter weather.

Temperature

December, known for its average high temperature of 32.9°F (0.5°C) and an average low temperature of 21.9°F (-5.6°C), is the coldest month in Jerome.

Humidity

The average relative humidity in December is 79%.

Rainfall

December is the month with the most rainfall in Jerome. Rain falls for 7.4 days and accumulates 1.3" (33mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. In Jerome, in December, snow falls for 10.8 days, with typically accumulated 6.14" (156mm) of snow. In Jerome, Idaho, during the entire year, snow falls for 42 days and aggregates up to 23.35" (593mm) of snow.

Daylight

With an average of 9h and 6min of daylight, December has the shortest days of the year in Jerome.
On the first day of the month, sunrise is at 7:49 am and sunset at 5:05 pm. On the last day of December, sunrise is at 8:08 am and sunset at 5:14 pm MST.

Sunshine

December has the least sunshine of the year in Jerome, with an average of 5.7h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: During December, 2 as the daily maximum UV index converts into the following advice:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
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Frequently asked questions

What part of the year is the coldest in Jerome?

December, characterized by an average high temperature of 32.9°F (0.5°C) and a low temperature of 21.9°F (-5.6°C), is generally the coldest month in Jerome, Idaho.

How cold is it in Jerome in December?

The average high-temperature and low-temperature in Jerome during December are 32.9°F (0.5°C) and 21.9°F (-5.6°C) respectively.

What is the average humidity in December in Jerome?

The average relative humidity in December in Jerome is 79%.

What is the rainiest month in Jerome?

December is the month with the most rainfall in Jerome. Rain falls for 7.4 days and accumulates 1.3" (33mm) of precipitation.

How many days does it rain in December in Jerome?

In Jerome, during December, the rain falls for 7.4 days and regularly aggregates up to 1.3" (33mm) of precipitation.

How much does it snow in Jerome in December?

In Jerome, in December, during 10.8 snowfall days, 6.14" (156mm) of snow is typically accumulated.

What is the month with the shortest days in Jerome?

December has the shortest days of the year in Jerome, Idaho, with an average of 9h and 6min of daylight.

How many hours of daylight does Jerome have in December?

In December, the average day length in Jerome, Idaho, is 9h and 6min.

What time are sunrise and sunset in December in Jerome?

In December, on the first day of the month, sunrise is at 7:49 am and sunset at 5:05 pm. On the last day of the month, in Jerome, sunrise is at 8:08 am and sunset at 5:14 pm MST.

What is the month with the least sunshine in Jerome?

December has the least sunshine of the year, with an average of 5.7h of sunshine.

How long on average sun shines in December in Jerome?

In Jerome, the average sunshine duration in December is 5.7h.

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

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index reading in December in Jerome?

In December, the average daily maximum UV index in Jerome, Idaho, is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe 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 December
Jerome, ID

Average temperature in December - Jerome, ID
  • Average high temperature in December: 32.9°F

The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is December (32.9°F).

  • Average low temperature in December: 21.9°F

The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is December (21.9°F).

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Average pressure in December
Jerome, ID

Average pressure in December - Jerome, ID
  • Average pressure in December: 30.24"Hg

The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in December
Jerome, ID

Average wind speed in December - Jerome, ID
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average humidity in December
Jerome, ID

Average humidity in December - Jerome, ID
  • Average humidity in December: 79%

The month with the highest relative humidity is January (80%).
The months with the lowest relative humidity are July and August (29%).

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Average rainfall in December
Jerome, ID

Average rainfall in December - Jerome, ID
  • Average rainfall in December: 1.3"

The wettest month (with the highest rainfall) is December (1.3").
The driest month (with the least rainfall) is July (0.16").

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Average rainfall days in December
Jerome, ID

Average rainfall days in December - Jerome, ID
  • Average rainfall days in December: 7.4 days

The month with the highest number of rainy days is March (11.3 days).
The month with the least rainy days is July (3.3 days).

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Average snowfall in December
Jerome, ID

Average snowfall in December - Jerome, ID
  • Average snowfall in December: 6.14"

The month with the highest snowfall is January (7.44").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Jerome, ID

Average snowfall days in December - Jerome, ID
  • Average snowfall days in December: 10.8 days

The months with the highest number of snowfall days are January and December (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Jerome, ID

Average daylight in December / Average sunshine in December - Jerome, ID
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 5h and 4min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

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Average sunshine days in December
Jerome, ID

Average sunshine days in December - Jerome, ID
  • Average sunshine days in December: 17.3 days

The month with the most sunshine days is July (25.2 days).
The month with the least sunshine days is March (15.2 days).

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Average UV index in December
Jerome, ID

Average UV index in December - Jerome, ID
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Jerome, ID

Average cloud cover in December - Jerome, ID
  • Average cloud cover in December: 39

The month with the most cloud cover is December (Cloud cover 39).
The months with the least cloud cover are July and August (Cloud cover 9).

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Average visibility in December
Jerome, ID

Average visibility in December - Jerome, ID
  • Average visibility in December: 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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Jerome, Idaho, USA

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