January weather forecastMertztown, PA
January
Weather in January
January, like December, in Mertztown, Pennsylvania, is an icy winter month, with temperature in the range of an average low of 21.6°F (-5.8°C) and an average high of 34.3°F (1.3°C).Temperature
Mertztown's coldest weather arrives in January, when temperatures average a high of 34.3°F (1.3°C) and a low of 21.6°F (-5.8°C).Humidity
In January, the average relative humidity is 78%.Rainfall
In January, the rain falls for 8.5 days. Throughout January, 2.36" (60mm) of precipitation is accumulated. In Mertztown, during the entire year, the rain falls for 155.8 days and collects up to 30.75" (781mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Mertztown, in January, during 8.8 snowfall days, 4.17" (106mm) of snow is typically accumulated. Throughout the year, there are 29.4 snowfall days, and 15.87" (403mm) of snow is accumulated.Daylight
In January, the average length of the day in Mertztown is 9h and 40min.On the first day of the month, sunrise is at 7:25 am and sunset at 4:46 pm. On the last day of January, sunrise is at 7:13 am and sunset at 5:18 pm EST.
Sunshine
The average sunshine in January is 4.6h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum UV index of 2 during January leads to these instructions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Mertztown, PA
- Average high temperature in January: 34.3°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 (34.3°F).
- Average low temperature in January: 21.6°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in January
Mertztown, PA
- Average pressure in January: 30.09"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in January
Mertztown, PA
- Average wind speed in January: 8mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in January
Mertztown, PA
- Average humidity in January: 78%
The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).
Average rainfall in January
Mertztown, PA
- Average rainfall in January: 2.36"
The wettest month (with the highest rainfall) is April (2.99").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in January
Mertztown, PA
- Average rainfall days in January: 8.5 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (8.5 days).
Average snowfall in January
Mertztown, PA
- Average snowfall in January: 4.17"
The month with the highest snowfall is March (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Mertztown, PA
- Average snowfall days in January: 8.8 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Mertztown, PA
- Average daylight in January: 9h and 42min
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 18min).
- Average sunshine in January: 4h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in January
Mertztown, PA
- Average sunshine days in January: 17 days
The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is April (11.2 days).
Average UV index in January
Mertztown, 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
Mertztown, PA
- Average cloud cover in January: 49
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in January
Mertztown, PA
- Average visibility in January: 5mi
The months with the highest visibility are April, June, July and November (6mi).
The months with the lowest visibility are January, February, March, May, August, September, October and December (5mi).
