Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January, with its average high-temperature of 29.7°F (-1.3°C) and an average low-temperature of 17.4°F (-8.1°C), holds the record as the coldest month.Humidity
In January, the average relative humidity is 81%.Rainfall
In Trenton, in January, it is raining for 5.3 days, with typically 1.42" (36mm) of accumulated precipitation. In Trenton, during the entire year, the rain falls for 140.1 days and collects up to 29.92" (760mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. January is the month with the most snowfall. Snow falls for 9.6 days and accumulates 4.76" (121mm) of snow.Daylight
In January, the average length of the day is 9h and 37min.On the first day of January, sunrise is at 7:31 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 5:21 pm CST.
Sunshine
With an average of 4h of sunshine, January has the least sunshine of the year.UV index
January is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 1 during January leads to these advisories:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. To cut down UV radiation exposure by about half, sport a wide-brim hat. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
How cold is January?
What is the average humidity in January?
How much does it rain in January?
When does it snow the most?
How many days does it snow in January in Trenton?
How many hours of daylight does Trenton have in January?
When are sunrise and sunset in January in Trenton?
What is the month with the least sunshine in Trenton?
How many hours of sunshine does Trenton have in January?
When is the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Trenton, IA
- Average high temperature in January: 29.7°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 January: 17.4°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 January
Trenton, IA
- Average pressure in January: 30.15"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 January
Trenton, IA
- Average wind speed in January: 10.7mph
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 January
Trenton, IA
- Average humidity in January: 81%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Trenton, IA
- Average rainfall in January: 1.42"
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 January
Trenton, IA
- Average rainfall days in January: 5.3 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 January
Trenton, IA
- Average snowfall in January: 4.76"
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 January
Trenton, IA
- Average snowfall days in January: 9.6 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 January /
Average sunshine in January
Trenton, IA
- Average daylight in January: 9h and 4min
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 January: 4h
The month with the most sunshine is July (Average sunshine: 10h).
The month with the least sunshine is January (Average sunshine: 4h).
Average sunshine days in January
Trenton, IA
- Average sunshine days in January: 16.2 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 January
Trenton, IA
- Average UV index in January: 1
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 January
Trenton, IA
- Average cloud cover in January: 56
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 January
Trenton, IA
- Average visibility in January: 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).
Trenton, Iowa, USA
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