January weather forecast
Derry, NH

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Weather in January

January in Derry, New Hampshire typically welcomes the new year with cold temperatures and a significant chance of snowfall. On average, the temperatures range from 18°F (-7.8°C) to around 30.6°F (-0.8°C), with 2.4" (61mm) of snow accumulating over approximately seven days. Winter storms can lead to intermittent cycles of freezing and melting, affecting road conditions and outdoor activities. The higher chance of overcast skies also means fewer hours of daylight and sunshine. Nevertheless, the wintry landscape offers abundant opportunities for snow-transformed beauty and winter recreational activities.

Temperature

January brings the lowest temperatures, with an average high of 30.6°F (-0.8°C) and an average low of 18°F (-7.8°C).

Humidity

In January, the average relative humidity is 80%.

Rainfall

The month with the least rainfall is January, when the rain falls for 4.1 days and typically collects 0.75" (19mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Derry, in January, snow falls for 7.1 days, with typically accumulated 2.4" (61mm) of snow. In Derry, during the entire year, snow falls for 26.1 days and aggregates up to 11.54" (293mm) of snow.

Daylight

The average length of the day in January is 9h and 27min.
On the first day of the month, sunrise is at 7:16 am and sunset at 4:21 pm. On the last day of January, sunrise is at 7:01 am and sunset at 4:56 pm EST.

Sunshine

In Derry, the average sunshine in January is 5.1h.

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 estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.
Note: A daily high UV index of 2 in January leads to these guidelines:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest time of year?

In Derry, January registers the lowest temperatures, averaging 30.6°F (-0.8°C) at the peak and 18°F (-7.8°C) at the lowest.

How cold is it in January?

An average high-temperature, in January, in Derry, is 30.6°F (-0.8°C) and the average low-temperature is 18°F (-7.8°C).

What is the average humidity in January?

In Derry, the average relative humidity in January is 80%.

What is the driest month?

The month with the least rainfall is January, when the rain falls for 4.1 days and typically collects 0.75" (19mm) of precipitation.

How many days does it rain in January?

In Derry, during January, the rain falls for 4.1 days and regularly aggregates up to 0.75" (19mm) of precipitation.

How much does it snow in January?

In January, it is snowing for 7.1 days. Throughout January, 2.4" (61mm) of snow is accumulated.

What is the average length of the day in January?

In January, the average day length is 9h and 27min.

When are sunrise and sunset in January?

On the first day of January, sunrise is at 7:16 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 4:56 pm EST.

How long on average sun shines in January?

The average sunshine duration in January is 5.1h.

What is the month with the lowest UV index?

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

How high is the UV index in January?

In January, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a low health threat 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
Derry, NH

Average temperature in January - Derry, NH
  • Average high temperature in January: 30.6°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in January: 18°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (18°F).

Average pressure in January
Derry, NH

Average pressure in January - Derry, NH
  • Average pressure in January: 30.01"Hg

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in January
Derry, NH

Average wind speed in January - Derry, NH
  • Average wind speed in January: 8.3mph

The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in January
Derry, NH

Average humidity in January - Derry, NH
  • Average humidity in January: 80%

The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (72%).

Average rainfall in January
Derry, NH

Average rainfall in January - Derry, NH
  • Average rainfall in January: 0.75"

The wettest month (with the highest rainfall) is October (1.38").
The driest month (with the least rainfall) is January (0.75").

Average rainfall days in January
Derry, NH

Average rainfall days in January - Derry, NH
  • Average rainfall days in January: 4.1 days

The month with the highest number of rainy days is June (12.1 days).
The month with the least rainy days is January (4.1 days).

Average snowfall in January
Derry, NH

Average snowfall in January - Derry, NH
  • Average snowfall in January: 2.4"

The month with the highest snowfall is December (2.99").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in January
Derry, NH

Average snowfall days in January - Derry, NH
  • Average snowfall days in January: 7.1 days

The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in January /
Average sunshine in January
Derry, NH

Average daylight in January / Average sunshine in January - Derry, NH
  • Average daylight in January: 9h and 3min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in January: 5h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

Average sunshine days in January
Derry, NH

Average sunshine days in January - Derry, NH
  • Average sunshine days in January: 21.3 days

The months with the most sunshine days are January and December (21.3 days).
The month with the least sunshine days is June (16.7 days).

Average UV index in January
Derry, NH

Average UV index in January - Derry, NH
  • 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, November and December (UV index 2).

Average cloud cover in January
Derry, NH

Average cloud cover in January - Derry, NH
  • Average cloud cover in January: 45

The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 33).

Average visibility in January
Derry, NH

Average visibility in January - Derry, NH
  • Average visibility in January: 6mi

The months with the highest visibility are January, April, November and December (6mi).
The months with the lowest visibility are February, March, May, June, July, August, September and October (5mi).

Derry, New Hampshire, USA

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