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 shift into December is characterized by a noticeable reduction in the average high-temperature, decreasing from November's frosty 42.8°F (6°C) to a subzero cold 28.4°F (-2°C). Plymouth experiences an average low-temperature reading of 18°F (-7.8°C) throughout December.Humidity
In December, the average relative humidity is 85%.Rainfall
In Plymouth, during December, the rain falls for 5.5 days and regularly aggregates up to 1.34" (34mm) of precipitation. In Plymouth, Iowa, during the entire year, the rain falls for 129.5 days and collects up to 25.98" (660mm) of precipitation.Snowfall
Months with snowfall in Plymouth are January through May, October through December. In December, it is snowing for 11.7 days. Throughout December, 3.35" (85mm) of snow is accumulated. In Plymouth, during the entire year, snow falls for 50.1 days and aggregates up to 21.69" (551mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 0min of daylight.On the first day of December, sunrise is at 7:25 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 4:47 pm CST.
Sunshine
The average sunshine in December is 4.2h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Plymouth. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.Note: During December, 1 as the daily maximum UV index converts into the following advice:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
How cold is it in Plymouth in December?
What is the average humidity in December in Plymouth?
How many days does it rain in December in Plymouth?
How much does it snow in Plymouth in December?
What is the month with the shortest days in Plymouth?
What is the average length of the day in December in Plymouth?
When is the sunrise / sunset in December in Plymouth?
How many hours of sunshine does Plymouth have in December?
When is the lowest UV index in Plymouth?
How high is the UV index in December in Plymouth?
Average temperature in December
Plymouth, IA
- Average high temperature in December: 28.4°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in December: 18°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (10°F).
Average pressure in December
Plymouth, IA
- Average pressure in December: 30.11"Hg
The months with the highest atmospheric pressure are January and February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Plymouth, IA
- Average wind speed in December: 10.1mph
The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in December
Plymouth, IA
- Average humidity in December: 85%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Plymouth, IA
- Average rainfall in December: 1.34"
The wettest month (with the highest rainfall) is June (3.98").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in December
Plymouth, IA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3 days).
Average snowfall in December
Plymouth, IA
- Average snowfall in December: 3.35"
The month with the highest snowfall is February (5.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Plymouth, IA
- Average snowfall days in December: 11.7 days
The month with the highest number of snowfall days is January (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Plymouth, IA
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 4h and 1min
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 36min).
Average sunshine days in December
Plymouth, IA
- Average sunshine days in December: 16.4 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in December
Plymouth, IA
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Plymouth, IA
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Plymouth, 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).
Plymouth, Iowa, USA
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