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 is the coldest month, with an average high-temperature of 29.3°F (-1.5°C) and an average low-temperature of 16°F (-8.9°C).Humidity
The average relative humidity in January is 82%.Rainfall
The month with the least rainfall is January, when the rain falls for 4.7 days and typically collects 0.94" (24mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Derby. In Derby, in January, snow falls for 10.2 days, with typically accumulated 3.78" (96mm) of snow. Throughout the year, in Derby, there are 33.4 snowfall days, and 13.54" (344mm) of snow is accumulated.Daylight
In January, the average length of the day in Derby is 9h and 38min.On the first day of the month, sunrise is at 7:38 am and sunset at 4:56 pm. On the last day of January, sunrise is at 7:25 am and sunset at 5:29 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 4.2h of sunshine.UV index
With an average maximum UV index of 1, January is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 1 in January interprets into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month in Derby?
How cold is it in Derby in January?
What is the average humidity in January in Derby?
What is the driest month in Derby?
How many days does it rain in January in Derby?
How many days does it snow in January in Derby?
What is the average length of the day in January in Derby?
What time are sunrise and sunset in January in Derby?
What is the month with the least sunshine in Derby?
How long on average sun shines in January in Derby?
What is the month with the lowest UV index in Derby?
What is the UV index reading in January in Derby?
Average temperature in January
Derby, IA
- Average high temperature in January: 29.3°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in January: 16°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (16°F).
Average pressure in January
Derby, IA
- Average pressure in January: 30.16"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in January
Derby, 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 (7.1mph).
Average humidity in January
Derby, IA
- Average humidity in January: 82%
The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in January
Derby, IA
- Average rainfall in January: 0.94"
The wettest month (with the highest rainfall) is June (3.74").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in January
Derby, IA
- Average rainfall days in January: 4.7 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is January (4.7 days).
Average snowfall in January
Derby, IA
- Average snowfall in January: 3.78"
The month with the highest snowfall is February (4.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Derby, IA
- Average snowfall days in January: 10.2 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Derby, 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 and 1min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in January
Derby, IA
- Average sunshine days in January: 17.5 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is June (10.7 days).
Average UV index in January
Derby, 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
Derby, IA
- Average cloud cover in January: 54
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in January
Derby, IA
- Average visibility in January: 5mi
The months with the highest visibility are February, March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January and August (5mi).
Derby, Iowa, USA
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