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
The beginning of December marks a decrease in the average high-temperature, transitioning from a chilly 46.4°F (8°C) in November to an icy 34°F (1.1°C). In River Junction, the December nights cool down to an average low of 22.8°F (-5.1°C).Humidity
In River Junction, the average relative humidity in December is 80%.Rainfall
In River Junction, Iowa, during December, the rain falls for 7 days and regularly aggregates up to 1.46" (37mm) of precipitation. Throughout the year, in River Junction, Iowa, there are 140.4 rainfall days, and 29.57" (751mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in River Junction. In River Junction, in December, during 8.4 snowfall days, 2.28" (58mm) of snow is typically accumulated. Throughout the year, there are 37.7 snowfall days, and 16.42" (417mm) of snow is accumulated.Daylight
December has the shortest days of the year in River Junction, Iowa, with an average of 9h and 12min of daylight.On the first day of December in River Junction, sunrise is at 7:13 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:46 pm CST.
Sunshine
In December, the average sunshine is 4.4h.UV index
In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily high UV index of 2 in December leads to these guidelines:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. During bright days, sunglasses that offer UVA and UVB defense are recommended. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Frequently asked questions
How cold is it in River Junction in December?
What is the average humidity in December in River Junction?
How much does it rain in River Junction in December?
How many days does it snow in December in River Junction?
What is the month with the shortest days in River Junction?
What is the average length of the day in December in River Junction?
When is the sunrise / sunset in December in River Junction?
How long on average sun shines in December in River Junction?
What is the UV index reading in December in River Junction?
Average temperature in December
River Junction, IA
- Average high temperature in December: 34°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (27.3°F).
- Average low temperature in December: 22.8°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 (15.3°F).
Average pressure in December
River Junction, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
River Junction, IA
- Average wind speed in December: 9.9mph
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 (6.9mph).
Average humidity in December
River Junction, IA
- Average humidity in December: 80%
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
River Junction, IA
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is May (4.69").
The driest months (with the least rainfall) are January and February (1.34").
Average rainfall days in December
River Junction, IA
- Average rainfall days in December: 7 days
The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (5 days).
Average snowfall in December
River Junction, IA
- Average snowfall in December: 2.28"
The month with the highest snowfall is January (5.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
River Junction, IA
- Average snowfall days in December: 8.4 days
The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
River Junction, IA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in December
River Junction, IA
- Average sunshine days in December: 17 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10 days).
Average UV index in December
River Junction, IA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
River Junction, IA
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
River Junction, IA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
River Junction, Iowa, USA
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