December weather forecast
May, ID

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Weather in December

December, the first month of the winter in May, is still a freezing cold month, with an average temperature varying between 26.1°F (-3.3°C) and 8.6°F (-13°C).

Temperature

May notes the coldest temperatures in December, with a high average of 26.1°F (-3.3°C) and a low of 8.6°F (-13°C).

Humidity

In May, the average relative humidity in December is 84%.

Rainfall

In May, during December, the rain falls for 4.6 days and regularly aggregates up to 0.51" (13mm) of precipitation. In May, during the entire year, the rain falls for 75.7 days and collects up to 6.38" (162mm) of precipitation.

Snowfall

Months with snowfall are January through June, September through December. In May, during December, snow falls for 10.1 days and regularly aggregates up to 3.03" (77mm) of snow. In May, Idaho, during the entire year, snow falls for 51.7 days and aggregates up to 18.62" (473mm) of snow.

Daylight

December has the shortest days of the year, with an average of 8h and 54min of daylight.
On the first day of the month, sunrise is at 7:53 am and sunset at 4:56 pm. On the last day of December, sunrise is at 8:12 am and sunset at 5:05 pm MST.

Sunshine

The average sunshine in December is 6h.

UV index

The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the average person.
Note: In December, the maximum UV index of 2 suggests this advice:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Experience reduced UV exposure by about half when donning a wide-brim hat. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months?

December is May's coldest month, registering average high temperatures of 26.1°F (-3.3°C) and lows of 8.6°F (-13°C).

How cold is it in December?

An average high-temperature, in December, in May, is 26.1°F (-3.3°C) and the average low-temperature is 8.6°F (-13°C).

What is the average humidity in December in May?

In December, the average relative humidity is 84%.

How many days does it rain in December?

In May, during December, the rain falls for 4.6 days and regularly aggregates up to 0.51" (13mm) of precipitation.

How many days does it snow in December?

In May, in December, snow falls for 10.1 days, with typically accumulated 3.03" (77mm) of snow.

What is the month with the shortest days?

With an average of 8h and 54min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

The average day length in December is 8h and 53min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:53 am and sunset at 4:56 pm. On the last day of the month, sunrise is at 8:12 am and sunset at 5:05 pm MST.

How long on average sun shines in December?

The average sunshine duration in December is 6h.

What is the month with the lowest UV index?

The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2.

What is the UV index reading in December?

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

Average temperature in December - May, ID
  • Average high temperature in December: 26.1°F

The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is December (26.1°F).

  • Average low temperature in December: 8.6°F

The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is January (8.1°F).

Average pressure in December
May, ID

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

The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
May, ID

Average wind speed in December - May, ID
  • Average wind speed in December: 5mph

The windiest months (with the highest average wind speed) are June and July (5.7mph).
The calmest month (with the lowest average wind speed) is January (4.8mph).

Average humidity in December
May, ID

Average humidity in December - May, ID
  • Average humidity in December: 84%

The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are July and August (38%).

Average rainfall in December
May, ID

Average rainfall in December - May, ID
  • Average rainfall in December: 0.51"

The wettest month (with the highest rainfall) is June (1.1").
The driest month (with the least rainfall) is July (0.28").

Average rainfall days in December
May, ID

Average rainfall days in December - May, ID
  • Average rainfall days in December: 4.6 days

The month with the highest number of rainy days is June (10.2 days).
The month with the least rainy days is January (3.8 days).

Average snowfall in December
May, ID

Average snowfall in December - May, ID
  • Average snowfall in December: 3.03"

The month with the highest snowfall is February (3.54").
The months with the least snowfall are July and August (0").

Average snowfall days in December
May, ID

Average snowfall days in December - May, ID
  • Average snowfall days in December: 10.1 days

The month with the highest number of snowfall days is December (10.1 days).
The months with the least snowfall days are July and August (0 days).

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

Average daylight in December / Average sunshine in December - May, ID
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in December: 6h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 48min).

Average sunshine days in December
May, ID

Average sunshine days in December - May, ID
  • Average sunshine days in December: 19.3 days

The month with the most sunshine days is July (24.1 days).
The months with the least sunshine days are March and April (17.2 days).

Average UV index in December
May, ID

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

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

Average cloud cover in December
May, ID

Average cloud cover in December - May, ID
  • Average cloud cover in December: 41

The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 11).

Average visibility in December
May, ID

Average visibility in December - May, ID
  • Average visibility in December: 5mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).

May, Idaho, USA

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