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
In Holtsville, the month of January is known for its lowest average temperatures, reaching a high of 37.9°F (3.3°C) and a low of 30.2°F (-1°C).Humidity
In Holtsville, the average relative humidity in January is 72%.Rainfall
The month with the least rainfall in Holtsville is January, when the rain falls for 8.3 days and typically collects 2.17" (55mm) of precipitation.Snowfall
Months with snowfall are January through March, May, October and December. In January, it is snowing for 4.3 days. Throughout January, 1.38" (35mm) of snow is accumulated. In Holtsville, during the entire year, snow falls for 14.7 days and aggregates up to 6.14" (156mm) of snow.Daylight
In Holtsville, New York, the average length of the day in January is 9h and 38min.On the first day of January, sunrise is at 7:16 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 5:07 pm EST.
Sunshine
In Holtsville, the average sunshine in January is 5.2h.UV index
January through March and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In January, a regular UV index of 2 translates into these guidelines:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. To avoid the Sun's strongest rays, limit exposure around the mid-day period. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year in Holtsville?
How cold does it get in January?
What is the average humidity in January?
What is the driest month?
How much does it rain in January?
How many days does it snow in January?
What is the average length of the day in January in Holtsville?
What time are sunrise and sunset in January?
How long on average sun shines in January?
What is the month with the lowest UV index in Holtsville?
How high is the UV index in January?
Average temperature in January
Holtsville, NY
- Average high temperature in January: 37.9°F
The warmest month (with the highest average high temperature) is August (78.1°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in January: 30.2°F
The month with the highest average low temperature is August (71.8°F).
The coldest month (with the lowest average low temperature) is January (30.2°F).
Average pressure in January
Holtsville, NY
- Average pressure in January: 30.04"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in January
Holtsville, NY
- Average wind speed in January: 13.8mph
The windiest month (with the highest average wind speed) is January (13.8mph).
The calmest months (with the lowest average wind speed) are July and August (9mph).
Average humidity in January
Holtsville, NY
- Average humidity in January: 72%
The months with the highest relative humidity are May and June (78%).
The month with the lowest relative humidity is November (71%).
Average rainfall in January
Holtsville, NY
- Average rainfall in January: 2.17"
The wettest month (with the highest rainfall) is December (3.74").
The driest month (with the least rainfall) is January (2.17").
Average rainfall days in January
Holtsville, NY
- Average rainfall days in January: 8.3 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in January
Holtsville, NY
- Average snowfall in January: 1.38"
The month with the highest snowfall is March (2.13").
The months with the least snowfall are April, June, July, August, September and November (0").
Average snowfall days in January
Holtsville, NY
- Average snowfall days in January: 4.3 days
The month with the highest number of snowfall days is February (4.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Holtsville, NY
- 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: 5h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in January
Holtsville, NY
- Average sunshine days in January: 18.4 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in January
Holtsville, NY
- 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 January, February, March and December (UV index 2).
Average cloud cover in January
Holtsville, NY
- Average cloud cover in January: 44
The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in January
Holtsville, NY
- 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).
Holtsville, New York, USA
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