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
The month of January, characterized by an average high of 35.1°F (1.7°C) and a low of 22.5°F (-5.3°C), is recognized as the coldest.Humidity
The average relative humidity in January is 78%.Rainfall
In Mount Joy, during January, the rain falls for 6.6 days and regularly aggregates up to 0.98" (25mm) of precipitation. In Mount Joy, during the entire year, the rain falls for 132.7 days and collects up to 15.35" (390mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. The month with the most snowfall is January, when snow falls for 5.7 days and typically aggregates up to 2.13" (54mm) of snow.Daylight
The average length of the day in January is 9h and 43min.On the first day of the month, sunrise is at 7:28 am and sunset at 4:50 pm. On the last day of January, sunrise is at 7:15 am and sunset at 5:23 pm EST.
Sunshine
In Mount Joy, the average sunshine in January is 4.8h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 2 during January translates into the following directions:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
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 Mount Joy?
What is the average length of the day in January in Mount Joy?
When are sunrise and sunset in January?
How many hours of sunshine does Mount Joy have in January?
When is the lowest UV index?
How high is the UV index in January?
Average temperature in January
Mount Joy, PA
- Average high temperature in January: 35.1°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (35.1°F).
- Average low temperature in January: 22.5°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in January
Mount Joy, PA
- Average pressure in January: 30.1"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in January
Mount Joy, PA
- Average wind speed in January: 8.6mph
The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in January
Mount Joy, PA
- Average humidity in January: 78%
The month with the highest relative humidity is May (81%).
The months with the lowest relative humidity are March and April (76%).
Average rainfall in January
Mount Joy, PA
- Average rainfall in January: 0.98"
The wettest month (with the highest rainfall) is August (1.97").
The driest month (with the least rainfall) is September (0.91").
Average rainfall days in January
Mount Joy, PA
- Average rainfall days in January: 6.6 days
The month with the highest number of rainy days is May (15.7 days).
The months with the least rainy days are January and November (6.6 days).
Average snowfall in January
Mount Joy, PA
- Average snowfall in January: 2.13"
The month with the highest snowfall is January (2.13").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Mount Joy, PA
- Average snowfall days in January: 5.7 days
The month with the highest number of snowfall days is January (5.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Mount Joy, PA
- Average daylight in January: 9h and 4min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in January
Mount Joy, PA
- Average sunshine days in January: 20.2 days
The month with the most sunshine days is November (21.4 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in January
Mount Joy, PA
- Average UV index in January: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in January
Mount Joy, PA
- Average cloud cover in January: 48
The months with the most cloud cover are February and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in January
Mount Joy, PA
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Mount Joy, Pennsylvania, USA
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