Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Ismay's weather in December involves a decrease in the average high-temperature, moving down from November's cold 40.1°F (4.5°C) to a freezing cold 26.6°F (-3°C). Nighttime temperature dips to a mean of 14.9°F (-9.5°C) during December.Humidity
In Ismay, the average relative humidity in December is 82%.Rainfall
The months with the least rainfall in Ismay are January and December Rain falls for 3.5 days and accumulates 0.55" (14mm) of rain.Snowfall
January through May, September through December are months with snowfall in Ismay. In Ismay, in December, during 11.3 snowfall days, 3.35" (85mm) of snow is typically accumulated. In Ismay, during the entire year, snow falls for 62.4 days and aggregates up to 21.97" (558mm) of snow.Daylight
December has the shortest days of the year in Ismay, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:23 am and sunset at 4:13 pm. On the last day of December, in Ismay, sunrise is at 7:42 am and sunset at 4:22 pm MST.
Sunshine
February and December, with an average of 4.8h of sunshine, are months with the least sunshine.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Ismay, Montana. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily maximum UV index of 1 in December translates into the following instructions:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Ismay in December?
What is the average humidity in December in Ismay?
What is the driest month in Ismay?
How much does it rain in Ismay in December?
How many days does it snow in December in Ismay?
What is the month with the shortest days in Ismay?
How many hours of daylight does Ismay have in December?
When are sunrise and sunset in December in Ismay?
What are the months with the least sunshine in Ismay?
How long on average sun shines in December in Ismay?
When is the lowest UV index in Ismay?
What is the UV index intensity in December in Ismay?
Average temperature in December
Ismay, MT
- Average high temperature in December: 26.6°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in December: 14.9°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 December
Ismay, MT
- Average pressure in December: 30.14"Hg
The months with the highest atmospheric pressure are January and February (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Ismay, MT
- Average wind speed in December: 11.4mph
The windiest months (with the highest average wind speed) are April and October (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (10.1mph).
Average humidity in December
Ismay, MT
- Average humidity in December: 82%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (46%).
Average rainfall in December
Ismay, MT
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is May (2.6").
The driest months (with the least rainfall) are January and December (0.55").
Average rainfall days in December
Ismay, MT
- Average rainfall days in December: 3.5 days
The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is January (3.1 days).
Average snowfall in December
Ismay, MT
- Average snowfall in December: 3.35"
The month with the highest snowfall is February (3.86").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Ismay, MT
- Average snowfall days in December: 11.3 days
The month with the highest number of snowfall days is February (12 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Ismay, MT
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 4h and 5min
The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days in December
Ismay, MT
- Average sunshine days in December: 17.7 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (11.9 days).
Average UV index in December
Ismay, MT
- Average UV index in December: 1
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Ismay, MT
- Average cloud cover in December: 50
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in December
Ismay, MT
- 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).
Ismay, Montana, USA
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