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
Onset of December witnesses a reduction in the average high-temperature, falling from a frosty 48°F (8.9°C) in November to a cold 36°F (2.2°C). In December, Merrimac reports a consistent average low-temperature of 24.6°F (-4.1°C) during the nights.Humidity
In Merrimac, the average relative humidity in December is 80%.Rainfall
February and December are months with the least rain in Merrimac when the rain falls for 7.3 days and typically aggregates up to 1.38" (35mm) of rain.Snowfall
Months with snowfall in Merrimac are January through April, October through December. In Merrimac, during December, snow falls for 6 days and regularly aggregates up to 1.65" (42mm) of snow. In Merrimac, during the entire year, snow falls for 30.7 days and aggregates up to 15" (381mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:13 am and sunset at 4:39 pm. On the last day of December, in Merrimac, Iowa, sunrise is at 7:31 am and sunset at 4:48 pm CST.
Sunshine
In Merrimac, the average sunshine in December is 4.5h.UV index
The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In December, an average UV index of 2 transforms into the following instructions:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Frequently asked questions
How cold is December in Merrimac?
What is the average humidity in December in Merrimac?
What is the driest month in Merrimac?
How many days does it rain in December in Merrimac?
How much does it snow in Merrimac in December?
What is the month with the shortest days in Merrimac?
How many hours of daylight does Merrimac have in December?
What time are sunrise and sunset in December in Merrimac?
How long on average sun shines in December in Merrimac?
What is the UV index reading in December in Merrimac?
Average temperature in December
Merrimac, IA
- Average high temperature in December: 36°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in December: 24.6°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in December
Merrimac, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Merrimac, IA
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).
Average humidity in December
Merrimac, IA
- Average humidity in December: 80%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Merrimac, IA
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is May (4.29").
The driest months (with the least rainfall) are February and December (1.38").
Average rainfall days in December
Merrimac, IA
- Average rainfall days in December: 7.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in December
Merrimac, IA
- Average snowfall in December: 1.65"
The month with the highest snowfall is January (4.76").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Merrimac, IA
- Average snowfall days in December: 6 days
The month with the highest number of snowfall days is January (9.6 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
Merrimac, IA
- Average daylight in December: 9h and 2min
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 18min).
- Average sunshine in December: 4h and 3min
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 0min).
Average sunshine days in December
Merrimac, IA
- Average sunshine days in December: 18 days
The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is May (10.6 days).
Average UV index in December
Merrimac, IA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Merrimac, IA
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are July, August and September (Cloud cover 31).
Average visibility in December
Merrimac, 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).
Merrimac, Iowa, USA
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