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

May weather forecast and climate
Winthrop, MA

May, the last month of the spring, in Winthrop, is a comfortable month, with average temperature ranging between max 66.4°F (19.1°C) and min 50°F (10°C).

Temperature

In Winthrop, the average high-temperature increases, from a fresh 55.2°F (12.9°C) in April, to a comfortable 66.4°F (19.1°C). In May, the average low-temperature is 50°F (10°C).

Humidity

The average relative humidity in Winthrop is 72%.

Rainfall

In Winthrop, during May, the rain falls for 15.3 days and regularly aggregates up to 1.81" (46mm) of precipitation. In Winthrop, Massachusetts, during the entire year, the rain falls for 141.4 days and collects up to 27.2" (691mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.1 snowfall days, in May, Winthrop aggregates 0.04" (1mm) of snow. Throughout the year, there are 29.8 snowfall days, and 15.75" (400mm) of snow is accumulated.

Ocean temperature

In Winthrop, the average water temperature is 49.1°F (9.5°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

In Winthrop, Massachusetts, the average length of the day is 14.6h.

Sunshine

In May, the average sunshine in Winthrop is 8.3h.

UV index

In Winthrop, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.

What is the temperature in May in Winthrop?

In May, in Winthrop, Massachusetts, the average high-temperature is 66.4°F (19.1°C), and the average low-temperature is 50°F (10°C).

What is the average humidity in May in Winthrop?

In Winthrop, the average relative humidity in May is 72%.

How much does it rain in Winthrop in May?

In May, in Winthrop, Massachusetts, the rain falls for 15.3 days. Throughout May, 1.81" (46mm) of precipitation is accumulated.

What is the last month it snows in Winthrop?

May is the last month it regularly snows in Winthrop, Massachusetts. During 0.1 snowfall days, in May, Winthrop aggregates 0.04" (1mm) of snow.

What is the ocean temperature in May in Winthrop?

In Winthrop, the average seawater temperature in May is 49.1°F (9.5°C). Swimming in 49.1°F (9.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Winthrop have in May?

In Winthrop, the average length of the day in May is 14.6h.

How many hours of sunshine does Winthrop have in May?

In May, the average sunshine in Winthrop is 8.3h.

How high is the UV index in May in Winthrop?

The average daily maximum UV index in May in Winthrop is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.
Average temperature in May - Winthrop, MA
  • Average high temperature in May: 66.4°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 May: 50°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 May - Winthrop, MA
  • Average humidity in May: 72%

The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is April (69%).

Average rainfall in May - Winthrop, MA
  • Average rainfall in May: 1.81"

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 May - Winthrop, MA
  • Average rainfall days in May: 15.3 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 May - Winthrop, MA
  • Average snowfall in May: 0.04"

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 May - Winthrop, MA
  • Average snowfall days in May: 0.1 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 May - Winthrop, MA
  • Average sea temperature in May: 49°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 May / Average sunshine in May - Winthrop, MA
  • Average daylight in May: 14.6h

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 May: 8.3h

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 May - Winthrop, MA
  • Average UV index in May: 5

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).