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
Willow Brook's coldest temperatures are experienced in January, with average high temperatures of 33.3°F (0.7°C) and lows of 20.5°F (-6.4°C).Humidity
In January, the average relative humidity is 79%.Rainfall
In Willow Brook, in January, it is raining for 5.8 days, with typically 0.71" (18mm) of accumulated precipitation. In Willow Brook, during the entire year, the rain falls for 131.1 days and collects up to 13.31" (338mm) of precipitation.Snowfall
Months with snowfall in Willow Brook are January through May, October through December. In January, it is snowing for 6.1 days. Throughout January, 1.5" (38mm) of snow is accumulated. Throughout the year, there are 25.8 snowfall days, and 6.89" (175mm) of snow is accumulated.Daylight
The average length of the day in January in Willow Brook is 9h and 37min.On the first day of January, sunrise is at 7:22 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 5:12 pm EST.
Sunshine
The average sunshine in January is 4.9h.UV index
The months with the lowest UV index in Willow Brook are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for average individuals.Note: In January, a daily maximum UV index of 2 leads to the following instructions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Boost your sun resistance with garments that are densely woven yet spacious. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year in Willow Brook?
How cold is it in January?
What is the average humidity in January?
How many days does it rain in January?
How much does it snow in January?
How many hours of daylight does Willow Brook have in January?
What time are sunrise and sunset in January?
How many hours of sunshine does Willow Brook have in January?
What are the months with the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Willow Brook, NJ
- Average high temperature in January: 33.3°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (33.3°F).
- Average low temperature in January: 20.5°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).
Average pressure in January
Willow Brook, NJ
- Average pressure in January: 30.06"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in January
Willow Brook, NJ
- Average wind speed in January: 7.5mph
The windiest months (with the highest average wind speed) are January and March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in January
Willow Brook, NJ
- Average humidity in January: 79%
The months with the highest relative humidity are February, October and December (81%).
The month with the lowest relative humidity is April (76%).
Average rainfall in January
Willow Brook, NJ
- Average rainfall in January: 0.71"
The wettest month (with the highest rainfall) is July (1.77").
The driest month (with the least rainfall) is September (0.63").
Average rainfall days in January
Willow Brook, NJ
- Average rainfall days in January: 5.8 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is January (5.8 days).
Average snowfall in January
Willow Brook, NJ
- Average snowfall in January: 1.5"
The month with the highest snowfall is March (1.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Willow Brook, NJ
- Average snowfall days in January: 6.1 days
The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Willow Brook, NJ
- 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 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in January
Willow Brook, NJ
- Average sunshine days in January: 20.4 days
The months with the most sunshine days are January and November (20.4 days).
The month with the least sunshine days is June (12.5 days).
Average UV index in January
Willow Brook, NJ
- Average UV index in January: 2
The month with the highest UV index is June (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
Willow Brook, NJ
- Average cloud cover in January: 47
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are July and August (Cloud cover 35).
Average visibility in January
Willow Brook, NJ
- Average visibility in January: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
Willow Brook, New Jersey, USA
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