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, characterized by an average high temperature of 28°F (-2.2°C) and a low temperature of 15.1°F (-9.4°C), is generally the coldest month.Humidity
The most humid month is January, with an average relative humidity of 82%.Rainfall
The month with the least rainfall is January, when the rain falls for 2.9 days and typically collects 0.67" (17mm) of precipitation.Snowfall
Months with snowfall in Castana, Iowa, are January through April, October through December. In Castana, in January, snow falls for 8.9 days, with typically accumulated 2.48" (63mm) of snow. In Castana, during the entire year, snow falls for 32.9 days and aggregates up to 11.69" (297mm) of snow.Daylight
In Castana, the average length of the day in January is 9h and 32min.On the first day of January, sunrise is at 7:51 am and sunset at 5:02 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 5:36 pm CST.
Sunshine
The month with the least sunshine is January, with an average of 4.4h of sunshine.UV index
In January, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: The UV index of 2 in January translates into these instructions:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
How cold is it in January?
What is the most humid month?
What is the average humidity in January?
What is the driest month in Castana?
How much does it rain in January?
How much does it snow in Castana in January?
What is the average length of the day in January?
What time are sunrise and sunset in January?
What is the month with the least sunshine?
How many hours of sunshine does Castana have in January?
What is the UV index intensity in January?
Average temperature in January
Castana, IA
- Average high temperature in January: 28°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in January: 15.1°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in January
Castana, 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 (29.86"Hg).
Average wind speed in January
Castana, IA
- Average wind speed in January: 10.4mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).
Average humidity in January
Castana, IA
- Average humidity in January: 82%
The month with the highest relative humidity is January (82%).
The months with the lowest relative humidity are April and October (66%).
Average rainfall in January
Castana, IA
- Average rainfall in January: 0.67"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in January
Castana, IA
- Average rainfall days in January: 2.9 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is February (2.7 days).
Average snowfall in January
Castana, IA
- Average snowfall in January: 2.48"
The month with the highest snowfall is February (3.03").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Castana, IA
- Average snowfall days in January: 8.9 days
The month with the highest number of snowfall days is January (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Castana, IA
- Average daylight in January: 9h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in January
Castana, IA
- Average sunshine days in January: 19.4 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is June (12 days).
Average UV index in January
Castana, IA
- Average UV index in January: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in January
Castana, IA
- Average cloud cover in January: 52
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in January
Castana, IA
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Castana, Iowa, USA
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