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
Arrival of December comes with a reduction in the average high-temperature, falling from a chilly 47.7°F (8.7°C) in November to a wintry 36.3°F (2.4°C). The low-temperature averages to a freezing cold 26.8°F (-2.9°C) during the nights of December.Humidity
In December, the average relative humidity is 81%.Rainfall
In Lewiston, during December, the rain falls for 8.1 days and regularly aggregates up to 1.3" (33mm) of precipitation. In Lewiston, during the entire year, the rain falls for 151.2 days and collects up to 22.64" (575mm) of precipitation.Snowfall
Months with snowfall in Lewiston are January through May, November and December. In Lewiston, in December, snow falls for 8.5 days, with typically accumulated 1.97" (50mm) of snow. In Lewiston, Indiana, during the entire year, snow falls for 40.3 days and aggregates up to 10.91" (277mm) of snow.Daylight
The month with the shortest days in Lewiston is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 6:54 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 4:30 pm CST.
Sunshine
In December, the average sunshine is 4.1h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum UV index, 1 during December, leads to the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index in Lewiston?
What is the UV index intensity in December?
Average temperature in December
Lewiston, IN
- Average high temperature in December: 36.3°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.4°F).
- Average low temperature in December: 26.8°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in December
Lewiston, IN
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Lewiston, IN
- Average wind speed in December: 9.5mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in December
Lewiston, IN
- Average humidity in December: 81%
The months with the highest relative humidity are July and August (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Lewiston, IN
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is January (1.02").
Average rainfall days in December
Lewiston, IN
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in December
Lewiston, IN
- Average snowfall in December: 1.97"
The month with the highest snowfall is February (3.23").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Lewiston, IN
- Average snowfall days in December: 8.5 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Lewiston, IN
- 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 1min
The months with the most sunshine are June and July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Lewiston, IN
- Average sunshine days in December: 15.4 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is July (9.6 days).
Average UV index in December
Lewiston, IN
- 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
Lewiston, IN
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July, August and September (Cloud cover 35).
Average visibility in December
Lewiston, IN
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
Lewiston, Indiana, USA
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