Winthrop
Massachusetts, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Winthrop, MA

December, the first month of the winter, in Winthrop, is still a cold month, with average temperature varying between 39.9°F (4.4°C) and 29.7°F (-1.3°C).

Temperature

In Winthrop, the average high-temperature decreases, from a chilly 49.5°F (9.7°C) in November, to a cold 39.9°F (4.4°C). In December, the average low-temperature is 29.7°F (-1.3°C).

Humidity

The average relative humidity in Winthrop is 76%.

Rainfall

Months with the most rainfall in Winthrop, Massachusetts, are March, April and December, with an average 2.91" (74mm) of precipitation.

Snowfall

Months with snowfall in Winthrop are January through May, October through December. In Winthrop, snow falls for 5.2 days, with typically accumulated 2.83" (72mm) of snow. In Winthrop, Massachusetts, during the entire year, snow falls for 29.8 days, and aggregates up to 15.75" (400mm) of snow.

Ocean temperature

In December, the average ocean temperature in Winthrop is 46.2°F (7.9°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

December has the shortest days of the year in Winthrop, with an average of 9.1h of daylight.

Sunshine

The average sunshine in Winthrop is 4.7h.

UV index

Months with the lowest UV index in Winthrop are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to the UV radiation for ordinary individuals.
Note: The average daily UV index of 2 transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Winthrop?

In Winthrop, in December, the average high-temperature is 39.9°F (4.4°C), and the average low-temperature is 29.7°F (-1.3°C).

What is the average humidity in December in Winthrop?

In Winthrop, the average relative humidity in December is 76%.

How many days does it rain in December in Winthrop?

In Winthrop, Massachusetts, in December, during 10.1 rainfall days, 2.91" (74mm) of precipitation is typically accumulated.

What is the rainiest month in Winthrop?

The wettest months in Winthrop are March, April and December, with an average 2.91" (74mm) of rainfall.

How many days does it snow in December in Winthrop?

In Winthrop, in December, snow falls for 5.2 days, with typically accumulated 2.83" (72mm) of snow.

What is the ocean temperature in December in Winthrop?

In Winthrop, in December, the average water temperature is 46.2°F (7.9°C). Swimming in 46.2°F (7.9°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Winthrop?

With an average of 9.1h of daylight, December has the shortest days of the year in Winthrop, Massachusetts.

How many hours of daylight does Winthrop have in December?

The average length of the day in December in Winthrop, Massachusetts, is 9.1h.

How long on average sun shines in December in Winthrop?

In Winthrop, the average sunshine in December is 4.7h.

When is the lowest UV index in Winthrop?

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

What is the UV index reading in December in Winthrop?

In December, the average daily maximum UV index in Winthrop, Massachusetts, is 2. A UV Index value of 2, and less, symbolizes a low health threat from the exposure to the Sun's UV radiation.
Average temperature in December - Winthrop, MA
  • Average high temperature in December: 39.9°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 (34.2°F).

  • Average low temperature in December: 29.7°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

Average humidity in December - Winthrop, 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 (69%).

Average rainfall in December - Winthrop, MA
  • Average rainfall in December: 2.91"

The wettest months (with the highest rainfall) are March, April and December (2.91").
The driest month (with the least rainfall) is September (1.26").

Average rainfall days in December - Winthrop, MA
  • Average rainfall days in December: 10.1 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (7.9 days).

Average snowfall in December - Winthrop, MA
  • Average snowfall in December: 2.83"

The month with the highest snowfall is February (4.72").
Months with the least snowfall are June, July, August and September (0").

Average snowfall days in December - Winthrop, MA
  • Average snowfall days in December: 5.2 days

Months with the highest number of snowfall days are January and February (7.6 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in December - Winthrop, 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).

Average daylight in December / Average sunshine in December - Winthrop, MA
  • Average daylight in December: 9.1h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in December: 4.7h

The month with the most sunshine is August (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.6h).

Average UV index in December - Winthrop, MA
  • Average UV index in December: 2

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