January weather forecast
Holtsville, NY

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Weather in January

January, like December, in Holtsville, New York, is another cold winter month, with an average temperature varying between 30.2°F (-1°C) and 37.9°F (3.3°C).

Temperature

January, marked by an average high-temperature of 37.9°F (3.3°C) and a low-temperature of 30.2°F (-1°C), is the coldest month.

Humidity

In January, the average relative humidity in Holtsville is 72%.

Rainfall

The month with the least rainfall 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 Holtsville, in January, snow falls for 4.3 days, with typically accumulated 1.38" (35mm) of snow. Throughout the year, there are 14.7 snowfall days, and 6.14" (156mm) of snow is accumulated.

Daylight

In Holtsville, the average length of the day in January is 9h and 38min.
On the first day of January in Holtsville, New York, 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

The average sunshine in January is 5.2h.

UV index

The months with the lowest UV index are January through March and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: A daily high UV index of 2 in January leads to these guidelines:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
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Frequently asked questions

What is the coldest month in Holtsville?

January is the coldest month in Holtsville, exhibiting average temperatures of 37.9°F (3.3°C) at the peak and 30.2°F (-1°C) at the base.

How cold is January in Holtsville?

During January, Holtsville experiences an average high-temperature of 37.9°F (3.3°C) and a low-temperature of 30.2°F (-1°C).

What is the average humidity in January in Holtsville?

In Holtsville, New York, the average relative humidity in January is 72%.

What is the driest month in Holtsville?

The month with the least rainfall in Holtsville, New York, is January, when the rain falls for 8.3 days and typically collects 2.17" (55mm) of precipitation.

How many days does it rain in January in Holtsville?

In Holtsville, during January, the rain falls for 8.3 days and regularly aggregates up to 2.17" (55mm) of precipitation.

How much does it snow in Holtsville in January?

In Holtsville, New York, in January, snow falls for 4.3 days, with typically accumulated 1.38" (35mm) of snow.

What is the average length of the day in January in Holtsville?

In Holtsville, New York, the average day length in January is 9h and 38min.

When are sunrise and sunset in January in Holtsville?

In January, on the first day of the month, 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.

How long on average sun shines in January in Holtsville?

In January, the average sunshine duration in Holtsville is 5.2h.

When is the lowest UV index in Holtsville?

The months with the lowest UV index in Holtsville, New York, are January through March and December, with an average maximum UV index of 2.

What is the UV index intensity in January in Holtsville?

In January, the average daily maximum UV index in Holtsville, New York, is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Holtsville, NY

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).

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Average pressure in January
Holtsville, NY

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).

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Average wind speed in January
Holtsville, NY

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).

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Average humidity in January
Holtsville, NY

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%).

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Average rainfall in January
Holtsville, NY

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").

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Average rainfall days in January
Holtsville, NY

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).

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Average snowfall in January
Holtsville, NY

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").

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Average snowfall days in January
Holtsville, NY

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).

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Average daylight in January /
Average sunshine in January
Holtsville, NY

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).

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Average sunshine days in January
Holtsville, NY

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).

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Average UV index in January
Holtsville, NY

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).

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Average cloud cover in January
Holtsville, NY

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).

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Average visibility in January
Holtsville, NY

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).

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Holtsville, New York, USA

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