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
Stepping into December, Julien observes a temperature decline, with the average high falling from November's chilly 43.9°F (6.6°C) to a subzero cold 31.5°F (-0.3°C). Nighttime temperature in Julien experiences an average drop to a still freezing cold 21°F (-6.1°C) in December.Humidity
In December, the average relative humidity is 82%.Rainfall
In Julien, in December, during 6.3 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. Throughout the year, there are 135.3 rainfall days, and 27.4" (696mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In Julien, Iowa, in December, snow falls for 9 days, with typically accumulated 2.68" (68mm) of snow. In Julien, during the entire year, snow falls for 43.9 days and aggregates up to 17.09" (434mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:13 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:40 pm CST.
Sunshine
In December, the average sunshine is 4h.UV index
The months with the lowest UV index in Julien, Iowa, are January, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the UV index of 1 transforms into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Opt for tightly woven and loose clothing to enhance protection from the Sun. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Julien?
What is the average humidity in December in Julien?
How much does it rain in Julien in December?
How many days does it snow in December in Julien?
What is the month with the shortest days in Julien?
How many hours of daylight does Julien have in December?
When are sunrise and sunset in December in Julien?
How long on average sun shines in December in Julien?
What is the month with the lowest UV index in Julien?
What is the UV index reading in December in Julien?
Average temperature in December
Julien, IA
- Average high temperature in December: 31.5°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (25°F).
- Average low temperature in December: 21°F
The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (12.4°F).
Average pressure in December
Julien, IA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Julien, IA
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in December
Julien, IA
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is October (76%).
Average rainfall in December
Julien, IA
- Average rainfall in December: 1.38"
The wettest months (with the highest rainfall) are May and June (3.7").
The driest months (with the least rainfall) are January and February (1.14").
Average rainfall days in December
Julien, IA
- Average rainfall days in December: 6.3 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (4.4 days).
Average snowfall in December
Julien, IA
- Average snowfall in December: 2.68"
The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Julien, IA
- Average snowfall days in December: 9 days
The month with the highest number of snowfall days is January (12.8 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
Julien, IA
- Average daylight in December: 9h and 1min
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 6min).
- Average sunshine in December: 4h and 0min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Julien, IA
- Average sunshine days in December: 17.5 days
The months with the most sunshine days are November and December (17.5 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in December
Julien, IA
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Julien, IA
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Julien, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Julien, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location