May weather forecast and climate
Hartford, CT

Skyscape view of the city of Hartford, Connecticut, with the roads leading to the town, and trees on roadsides
Skyscape view of the city of Hartford, Connecticut, with the roads leading to the town, and trees on roadsides
May, the last month of the spring, in Hartford, is an agreeable month, with average temperature fluctuating between 68.7°F (20.4°C) and 49.5°F (9.7°C).

Temperature

In Hartford, the average high-temperature increases, from a mild 56.5°F (13.6°C) in April, to an agreeable 68.7°F (20.4°C). The average low-temperature, in Hartford, is 49.5°F (9.7°C).

Humidity

In Hartford, Connecticut, the average relative humidity is 74%.

Rainfall

In Hartford, Connecticut, during May, the rain falls for 10.8 days and regularly aggregates up to 0.91" (23mm) of precipitation. In Hartford, during the entire year, the rain falls for 113.2 days and collects up to 10.24" (260mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall. May is the last month it regularly snows. During 0.2 snowfall days, in May, Hartford aggregates 0.04" (1mm) of snow. Throughout the year, there are 21.5 snowfall days, and 4.45" (113mm) of snow is accumulated.

Daylight

The average length of the day in May is 14.6h.

Sunshine

In May, the average sunshine in Hartford, Connecticut, is 8.5h.

UV index

The average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in May in Hartford?

In May, the average high-temperature is 68.7°F (20.4°C), and the average low-temperature is 49.5°F (9.7°C).

What is the average humidity in May in Hartford?

In Hartford, the average relative humidity in May is 74%.

How many days does it rain in May in Hartford?

In Hartford, in May, it is raining for 10.8 days, with typically 0.91" (23mm) of accumulated precipitation.

What is the last month it snows in Hartford?

May is the last month it regularly snows in Hartford, Connecticut. During 0.2 snowfall days, in May, Hartford aggregates 0.04" (1mm) of snow.

How many hours of daylight does Hartford have in May?

The average length of the day in May in Hartford is 14.6h.

How long on average sun shines in May in Hartford?

The average sunshine in May is 8.5h.

What is the UV index intensity in May in Hartford?

In Hartford, Connecticut, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in May - Hartford, CT
  • Average high temperature in May: 20.4°C

The warmest month (with the highest average high temperature) is July (28.3°C).
The month with the lowest average high temperature is January (0.6°C).

  • Average low temperature in May: 9.7°C

The month with the highest average low temperature is July (17.6°C).
The coldest month (with the lowest average low temperature) is January (-5.9°C).

Average pressure in May - Hartford, CT
  • Average pressure in May: 1016.2mbar

The month with the highest atmospheric pressure is November (1018.8mbar).
The month with the lowest atmospheric pressure is June (1013.5mbar).

Average wind speed in May - Hartford, CT
  • Average wind speed in May: 10.4km/h

The windiest months (with the highest average wind speed) are January and March (13.1km/h).
The calmest months (with the lowest average wind speed) are July and August (8.5km/h).

Average humidity in May - Hartford, CT
  • Average humidity in May: 74%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (70%).

Average rainfall in May - Hartford, CT
  • Average rainfall in May: 23mm

The wettest months (with the highest rainfall) are June and July (27mm).
The driest month (with the least rainfall) is September (11mm).

Average rainfall days in May - Hartford, CT
  • Average rainfall days in May: 10.8 days

The month with the highest number of rainy days is July (11.8 days).
The month with the least rainy days is February (6.8 days).

Average snowfall in May - Hartford, CT
  • Average snowfall in May: 1mm

The month with the highest snowfall is February (29mm).
Months with the least snowfall are June, July, August, September and October (0mm).

Average snowfall days in May - Hartford, CT
  • Average snowfall days in May: 0.2 days

The month with the highest number of snowfall days is February (5.7 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in May / Average sunshine in May - Hartford, CT
  • 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: 9.2h).

  • Average sunshine in May: 8.5h

Months with the most sunshine are July and August (Average sunshine: 10.4h).
The month with the least sunshine is February (Average sunshine: 4.6h).

Average sunshine days in May - Hartford, CT
  • Average sunshine days in May: 16.9 days

Months with the most sunshine days are January and November (20.4 days).
The month with the least sunshine days is June (16.3 days).

Average UV index in May - Hartford, CT
  • 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).

Average cloud cover in May - Hartford, CT
  • Average cloud cover in May: 46

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 33).

Average visibility in May - Hartford, CT
  • Average visibility in May: 8km

Months with the highest visibility are January, March, April, October, November and December (9km).
Months with the lowest visibility are February, May, June, July, August and September (8km).