December weather forecast
Lynn, MA

Share
Large rocks on the shores of the coast of Lynn Massachusetts
Large rocks on the shores of the coast of Lynn Massachusetts

Weather in December

Finally, December greets Lynn with a distinct winter chill, recording an average temperature drop to 30.2°F (-1°C). This month sees an upward spike in snowfall, reaching 3.43" (87mm) indicating that Christmas is round the corner. The sea temperature falls further, discouraging all but the bravest from taking a dip. Limited sunlight and increased rainfall make this month a perfect time for warm foods and indoor activities, wrapping up the year on a cosy note.

Temperature

In December, the meteorological conditions in Lynn alter, with the average high-temperature shifting from a chilly 49.5°F (9.7°C) in November to an icy 39.9°F (4.4°C). An average low-temperature of 30.2°F (-1°C) is noted during the nights in December in Lynn.

Humidity

The average relative humidity in December is 76%.

Rainfall

The month with the most rainfall is December, when the rain falls for 10.3 days and typically aggregates up to 2.99" (76mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall in Lynn, Massachusetts. In Lynn, in December, during 5.3 snowfall days, 3.43" (87mm) of snow is typically accumulated. Throughout the year, in Lynn, there are 29.9 snowfall days, and 15.59" (396mm) of snow is accumulated.

Ocean temperature

In Lynn, in December, the average water temperature is 46.2°F (7.9°C).
Note: To swim in 46.2°F (7.9°C) at less than 50°F (10°C), ensure you're well-protected. Without it, be prepared for a sudden jolt of cold and breathing issues. Remember, even 55.4°F (13°C) is not welcoming.

Daylight

The month with the shortest days in Lynn, Massachusetts, is December, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 6:54 am and sunset at 4:11 pm. On the last day of December, in Lynn, Massachusetts, sunrise is at 7:13 am and sunset at 4:21 pm EST.

Sunshine

February and December, with an average of 4.6h of sunshine, are months with the least sunshine in Lynn, Massachusetts.

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 estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.
Note: In December, an average UV index of 2 transforms into the following instructions:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
[Resources]

Frequently asked questions

How cold is December in Lynn?

An average high-temperature, in December, in Lynn, is 39.9°F (4.4°C) and the average low-temperature is 30.2°F (-1°C).

What is the average humidity in December in Lynn?

The average relative humidity in December in Lynn, Massachusetts, is 76%.

What is the wettest month in Lynn?

December is the month with the most rainfall. Rain falls for 10.3 days and accumulates 2.99" (76mm) of precipitation.

How much does it rain in Lynn in December?

In Lynn, in December, during 10.3 rainfall days, 2.99" (76mm) of precipitation is typically accumulated.

How many days does it snow in December in Lynn?

In December, in Lynn, Massachusetts, it is snowing for 5.3 days. Throughout December, 3.43" (87mm) of snow is accumulated.

What is the ocean temperature in December in Lynn?

In Lynn, in December, the average water temperature is 46.2°F (7.9°C). Swimming in 46.2°F (7.9°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Lynn?

December has the shortest days of the year, with an average of 9h and 6min of daylight.

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

In December, the average day length is 9h and 8min.

When is the sunrise / sunset in December in Lynn?

On the first day of December in Lynn, Massachusetts, sunrise is at 6:54 am and sunset at 4:11 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 4:21 pm EST.

What are the months with the least sunshine in Lynn?

The months with the least sunshine in Lynn, Massachusetts, are February and December, with an average of 4.6h of sunshine.

How long on average sun shines in December in Lynn?

The average sunshine duration in December in Lynn, Massachusetts, is 4.6h.

What are the months with the lowest UV index in Lynn?

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

How high is the UV index in December in Lynn?

The average daily maximum UV index in December 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
Lynn, MA

Average temperature in December - Lynn, MA
  • Average high temperature in December: 39.9°F

The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (34.2°F).

  • Average low temperature in December: 30.2°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).

[Resources]

Average pressure in December
Lynn, MA

Average pressure in December - Lynn, MA
  • 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
Lynn, MA

Average wind speed in December - Lynn, MA
  • Average wind speed in December: 10.3mph

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

[Resources]

Average humidity in December
Lynn, MA

Average humidity in December - Lynn, MA
  • Average humidity in December: 76%

The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is April (70%).

[Resources]

Average rainfall in December
Lynn, MA

Average rainfall in December - Lynn, MA
  • Average rainfall in December: 2.99"

The wettest month (with the highest rainfall) is December (2.99").
The driest month (with the least rainfall) is September (1.42").

[Resources]

Average rainfall days in December
Lynn, MA

Average rainfall days in December - Lynn, MA
  • Average rainfall days in December: 10.3 days

The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (7.1 days).

[Resources]

Average snowfall in December
Lynn, MA

Average snowfall in December - Lynn, MA
  • Average snowfall in December: 3.43"

The month with the highest snowfall is February (4.61").
The months with the least snowfall are May, June, July, August and September (0").

[Resources]

Average snowfall days in December
Lynn, MA

Average snowfall days in December - Lynn, MA
  • Average snowfall days in December: 5.3 days

The months with the highest number of snowfall days are January and February (7.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

[Resources]

Average sea temperature in December
Lynn, MA

Average sea temperature in December - Lynn, MA
  • Average sea temperature in December: 46.3°F

The best month for swimming (with the highest average sea temperature) is August (67.6°F).
The coldest month (with the lowest average sea temperature) is March (38.8°F).

[Resources]

Average daylight in December /
Average sunshine in December
Lynn, MA

Average daylight in December / Average sunshine in December - Lynn, MA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 4h and 4min

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

[Resources]

Average sunshine days in December
Lynn, MA

Average sunshine days in December - Lynn, MA
  • Average sunshine days in December: 16.1 days

The month with the most sunshine days is January (17.8 days).
The month with the least sunshine days is April (13.2 days).

[Resources]

Average UV index in December
Lynn, MA

Average UV index in December - Lynn, MA
  • Average UV index in December: 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).

[Resources]

Average cloud cover in December
Lynn, MA

Average cloud cover in December - Lynn, MA
  • Average cloud cover in December: 49

The month with the most cloud cover is March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 32).

[Resources]

Average visibility in December
Lynn, MA

Average visibility in December - Lynn, MA
  • Average visibility in December: 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).

[Resources]

Lynn, Massachusetts, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location