December weather forecast
Rochester, NH

Weather in December

The first month of the winter, December, is also a wintry month in Rochester, New Hampshire, with an average temperature fluctuating between 24.6°F (-4.1°C) and 35.6°F (2°C).

Temperature

In Rochester, the average high-temperature in December drops from a chilly 46°F (7.8°C) in November to a cold 35.6°F (2°C). In December, the average low-temperature is 24.6°F (-4.1°C).

Humidity

The average relative humidity in December in Rochester is 80%.

Rainfall

The months with the most rainfall are October and December, with an average 3.11" (79mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. The month with the most snowfall is December, when snow falls for 7.2 days and typically aggregates up to 6.69" (170mm) of snow.

Daylight

With an average of 9h and 2min of daylight, December has the shortest days of the year in Rochester.
On the first day of December, sunrise is at 6:56 am and sunset at 4:09 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:17 pm EST.

Sunshine

The average sunshine in December in Rochester is 4.8h.

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 reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the average humidity in December in Rochester?

In December, the average relative humidity is 80%.

What is the wettest month in Rochester?

The months with the most rainfall in Rochester, New Hampshire, are October and December, with an average 3.11" (79mm) of precipitation.

How many days does it rain in December in Rochester?

In Rochester, in December, during 10 rainfall days, 3.11" (79mm) of precipitation is typically accumulated.

What is the snowiest month in Rochester?

December is the month with the most snowfall in Rochester. Snow falls for 7.2 days and accumulates 6.69" (170mm) of snow.

How much does it snow in Rochester in December?

In Rochester, New Hampshire, in December, during 7.2 snowfall days, 6.69" (170mm) of snow is typically accumulated.

What is the month with the shortest days in Rochester?

December has the shortest days of the year, with an average of 9h and 2min of daylight.

What is the average length of the day in December in Rochester?

In Rochester, the average day length in December is 9h and 2min.

When is the sunrise / sunset in December in Rochester?

In December, on the first day of the month, sunrise is at 6:56 am and sunset at 4:09 pm. On the last day of the month, in Rochester, sunrise is at 7:16 am and sunset at 4:17 pm EST.

How many hours of sunshine does Rochester have in December?

In December, the average sunshine duration in Rochester is 4.8h.

What is the month with the lowest UV index in Rochester?

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

How high is the UV index in December in Rochester?

The average daily maximum UV index in December in Rochester is 2. A UV Index reading of 2, and below, represents a low health threat from unprotected exposure to UV radiation.
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 December
Rochester, NH

Average temperature in December - Rochester, NH
  • Average high temperature in December: 35.6°F

The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in December: 24.6°F

The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

[Resources]

Average pressure in December
Rochester, NH

Average pressure in December - Rochester, NH
  • Average pressure in December: 30.03"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

[Resources]

Average wind speed in December
Rochester, NH

Average wind speed in December - Rochester, NH
  • Average wind speed in December: 8.5mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

[Resources]

Average humidity in December
Rochester, NH

Average humidity in December - Rochester, NH
  • Average humidity in December: 80%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is April (75%).

[Resources]

Average rainfall in December
Rochester, NH

Average rainfall in December - Rochester, NH
  • Average rainfall in December: 3.11"

The wettest months (with the highest rainfall) are October and December (3.11").
The driest month (with the least rainfall) is September (1.5").

[Resources]

Average rainfall days in December
Rochester, NH

Average rainfall days in December - Rochester, NH
  • Average rainfall days in December: 10 days

The month with the highest number of rainy days is May (15.1 days).
The month with the least rainy days is February (6.8 days).

[Resources]

Average snowfall in December
Rochester, NH

Average snowfall in December - Rochester, NH
  • Average snowfall in December: 6.69"

The month with the highest snowfall is December (6.69").
The months with the least snowfall are June, July, August and September (0").

[Resources]

Average snowfall days in December
Rochester, NH

Average snowfall days in December - Rochester, NH
  • Average snowfall days in December: 7.2 days

The month with the highest number of snowfall days is January (10.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

[Resources]

Average daylight in December /
Average sunshine in December
Rochester, NH

Average daylight in December / Average sunshine in December - Rochester, NH
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 20min).
The month with the shortest days is December (Average daylight: 9h and 2min).

  • Average sunshine in December: 4h and 48min

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 42min).

[Resources]

Average sunshine days in December
Rochester, NH

Average sunshine days in December - Rochester, NH
  • Average sunshine days in December: 16.1 days

The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is April (13.3 days).

[Resources]

Average UV index in December
Rochester, NH

Average UV index in December - Rochester, NH
  • Average UV index in December: 2

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

[Resources]

Average cloud cover in December
Rochester, NH

Average cloud cover in December - Rochester, NH
  • Average cloud cover in December: 47

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).

[Resources]

Average visibility in December
Rochester, NH

Average visibility in December - Rochester, NH
  • Average visibility in December: 6mi

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

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location