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
With the beginning of December, the average high-temperature shows a decrease, transitioning from a fresh 53.2°F (11.8°C) in November to a chilly 43.7°F (6.5°C). Irondale encounters an average low-temperature of 30.2°F (-1°C) during December nights.Humidity
In Irondale, the average relative humidity in December is 77%.Rainfall
In December, the rain falls for 7.9 days. Throughout December, 2.36" (60mm) of precipitation is accumulated. Throughout the year, there are 154.7 rainfall days, and 32.64" (829mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall in Irondale. In Irondale, during December, snow falls for 5 days and regularly aggregates up to 1.77" (45mm) of snow. Throughout the year, in Irondale, Missouri, there are 22.6 snowfall days, and 9.06" (230mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 7:00 am and sunset at 4:43 pm. On the last day of December, in Irondale, sunrise is at 7:18 am and sunset at 4:53 pm CST.
Sunshine
In Irondale, the average sunshine in December is 4.9h.UV index
The months with the lowest UV index in Irondale, Missouri, are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Irondale?
What is the average humidity in December in Irondale?
How many days does it rain in December in Irondale?
How much does it snow in Irondale in December?
What is the month with the shortest days in Irondale?
What is the average length of the day in December in Irondale?
What time are sunrise and sunset in December in Irondale?
How many hours of sunshine does Irondale have in December?
When is the lowest UV index in Irondale?
What is the UV index intensity in December in Irondale?
Average temperature in December
Irondale, MO
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (39.6°F).
- Average low temperature in December: 30.2°F
The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in December
Irondale, MO
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Irondale, MO
- Average wind speed in December: 8mph
The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Irondale, MO
- Average humidity in December: 77%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Irondale, MO
- Average rainfall in December: 2.36"
The wettest month (with the highest rainfall) is May (3.78").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in December
Irondale, MO
- Average rainfall days in December: 7.9 days
The month with the highest number of rainy days is July (17.2 days).
The month with the least rainy days is December (7.9 days).
Average snowfall in December
Irondale, MO
- Average snowfall in December: 1.77"
The month with the highest snowfall is February (2.72").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Irondale, MO
- Average snowfall days in December: 5 days
The month with the highest number of snowfall days is February (6.5 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
Irondale, MO
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The months with the least sunshine are January and February (Average sunshine: 4h and 48min).
Average sunshine days in December
Irondale, MO
- Average sunshine days in December: 18.9 days
The months with the most sunshine days are November and December (18.9 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in December
Irondale, MO
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Irondale, MO
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in December
Irondale, MO
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, October, November and December (6mi).
The months with the lowest visibility are May, July, August and September (5mi).
Irondale, Missouri, USA
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