Expand
Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
Weather in January
January, the same as December, is a wintry winter month in Old Mystic, Connecticut, with temperature in the range of an average high of 35.4°F (1.9°C) and an average low of 24.8°F (-4°C). Temperature records mark January as the coldest month, with highs averaging 35.4°F (1.9°C) and lows at 24.8°F (-4°C). Weather in January »
Weather in February
The last month of the winter, February, is also a wintry month in Old Mystic, Connecticut, with an average temperature fluctuating between 38.1°F (3.4°C) and 25.3°F (-3.7°C). Old Mystic experiences a subtle adjustment in high-temperatures to a still wintry 38.1°F (3.4°C) with the onset of February, maintaining near parity with January's 35.4°F (1.9°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Old Mystic, Connecticut, with an average temperature fluctuating between 44.2°F (6.8°C) and 32.4°F (0.2°C). As March sets, the average high-temperature shows a slight increase, moving up from an icy 38.1°F (3.4°C) in February to a frosty 44.2°F (6.8°C). Weather in March »
Weather in April
April is a cool spring month in Old Mystic, Connecticut, with an average temperature fluctuating between 54.5°F (12.5°C) and 41°F (5°C). As March gives way to April, the average high-temperature displays an increase, moving from a chilly 44.2°F (6.8°C) to a cool 54.5°F (12.5°C). Weather in April »
Weather in May
The last month of the spring, May, is an enjoyable month in Old Mystic, Connecticut, with an average temperature varying between 50.2°F (10.1°C) and 64.9°F (18.3°C). As Old Mystic enters May, the average high-temperature increases from the a cool 54.5°F (12.5°C) of April to a comfortable 64.9°F (18.3°C). Weather in May »
Weather in June
The first month of the summer, June, is an agreeable month in Old Mystic, Connecticut, with an average temperature ranging between min 57.9°F (14.4°C) and max 72.7°F (22.6°C). Old Mystic's transition into June is marked by a minor temperature shift, moving from a refreshing 64.9°F (18.3°C) in May to an agreeable 72.7°F (22.6°C). Weather in June »
Weather in July
July in Old Mystic, Connecticut, is a warm summer month, with temperature in the range of an average low of 65.3°F (18.5°C) and an average high of 80.2°F (26.8°C). Old Mystic's warmest weather arrives in July, when temperatures average a high of 80.2°F (26.8°C) and a low of 65.3°F (18.5°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Old Mystic, Connecticut, with temperature in the range of an average low of 64.4°F (18°C) and an average high of 79.2°F (26.2°C). Old Mystic's weather, upon August's arrival, documents an average high-temperature of a still moderately hot 79.2°F (26.2°C), nearly identical to the prior month. Weather in August »
Weather in September
The first month of the autumn, September, is also an agreeable month in Old Mystic, Connecticut, with an average temperature fluctuating between 72.5°F (22.5°C) and 58.1°F (14.5°C). September's onset brings a negligible change in high-temperatures, falling from a moderately hot 79.2°F (26.2°C) in August to an agreeable 72.5°F (22.5°C). Weather in September »
Weather in October
October, the same as September, is another enjoyable autumn month in Old Mystic, Connecticut, with temperature in the range of an average high of 61.7°F (16.5°C) and an average low of 49.6°F (9.8°C). The commencement of October involves a temperature shift, with the average high-temperature dropping from an agreeable 72.5°F (22.5°C) in September to a refreshing 61.7°F (16.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Old Mystic, is also a fresh month, with an average temperature ranging between max 50.9°F (10.5°C) and min 38.7°F (3.7°C). November's arrival correlates with a reduction in the average high-temperature, down from an enjoyable 61.7°F (16.5°C) in October to a fresh 50.9°F (10.5°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Old Mystic, Connecticut, with an average temperature fluctuating between 41.7°F (5.4°C) and 31.3°F (-0.4°C). With the onset of December, Old Mystic experiences a modest temperature adjustment, with the average high-temperature receding from a cool 50.9°F (10.5°C) in November to an icy 41.7°F (5.4°C). Weather in December »
Updated: Jul 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
January is the month when Old Mystic experiences its coldest temperatures, averaging a high of 35.4°F (1.9°C) and a low of 24.8°F (-4°C).
How much does it rain?
Throughout the year, there are 162.1 rainfall days, and 33.66" (855mm) of precipitation is accumulated.
When does it snow in Old Mystic?
Months with snowfall are January through May, November and December.
How much does it snow in Old Mystic?
Throughout the year, in Old Mystic, there are 26.7 snowfall days, and 9.72" (247mm) of snow is accumulated.
When is the lowest UV index?
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
What are the months with the least sunshine?
The months with the least sunshine are February and December, with an average of 4.8h of sunshine.
What is the snowiest month?
The month with the most snowfall is March, when snow falls for 6.3 days and typically aggregates up to 2.56" (65mm) of snow.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Old Mystic, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
What is the least humid month?
April is the least humid month, with an average relative humidity of 73%.
What is the most humid month?
June and July, with an average relative humidity of 79%, are most humid months.
When it does not snow?
In Old Mystic, snow does not fall in June through October.
When are the longest days?
With an average of 15h and 6min of daylight, June has the longest days of the year.
What are the months with the highest UV index in Old Mystic?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What time of the year is the hottest in Old Mystic?
July, recording an average high temperature of 80.2°F (26.8°C) and a low temperature of 65.3°F (18.5°C), is Old Mystic's warmest month.
What month has the most sunshine?
The month with the most sunshine in Old Mystic is August, with an average of 10.4h of sunshine.
What is the driest month in Old Mystic?
September is the month with the least rainfall. Rain falls for 12.1 days and accumulates 1.61" (41mm) of precipitation.
What is the wettest month?
The month with the most rainfall is December, when the rain falls for 12.3 days and typically aggregates up to 3.78" (96mm) of precipitation.
What is the month with the shortest days in Old Mystic?
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Old Mystic, CT
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (35.4°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 (24.8°F).
Average pressure
Old Mystic, CT
- Average pressure in January:
30.02"Hg - Average pressure in February:
30"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.05"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Old Mystic, CT
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.3mph - Average wind speed in March:
10.4mph - Average wind speed in April:
9.7mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
7mph - Average wind speed in August:
6.8mph - Average wind speed in September:
7.7mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.5mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity
Old Mystic, CT
The months with the highest relative humidity are June and July (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall
Old Mystic, CT
- Average rainfall in January:
2.64" - Average rainfall in February:
2.56" - Average rainfall in March:
2.91" - Average rainfall in April:
3.27" - Average rainfall in May:
2.56" - Average rainfall in June:
2.83"
- Average rainfall in July:
2.76" - Average rainfall in August:
2.56" - Average rainfall in September:
1.61" - Average rainfall in October:
3.31" - Average rainfall in November:
2.87" - Average rainfall in December:
3.78"
The wettest month (with the highest rainfall) is December (3.78").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days
Old Mystic, CT
- Average rainfall days in January:
10 days - Average rainfall days in February:
10.3 days - Average rainfall days in March:
12.7 days - Average rainfall days in April:
15.8 days - Average rainfall days in May:
16.2 days - Average rainfall days in June:
16.6 days
- Average rainfall days in July:
16.4 days - Average rainfall days in August:
15.1 days - Average rainfall days in September:
12.1 days - Average rainfall days in October:
13.9 days - Average rainfall days in November:
10.7 days - Average rainfall days in December:
12.3 days
The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is January (10 days).
Average snowfall
Old Mystic, CT
The month with the highest snowfall is March (2.56").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days
Old Mystic, CT
- Average snowfall days in January:
7 days - Average snowfall days in February:
6.8 days - Average snowfall days in March:
6.3 days - Average snowfall days in April:
0.7 days - Average snowfall days in May:
0.2 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
1.1 days - Average snowfall days in December:
4.6 days
The month with the highest number of snowfall days is January (7 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight / Average sunshine
Old Mystic, CT
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
5h and 1min - Average sunshine in February:
4h and 5min - Average sunshine in March:
6h and 0min - Average sunshine in April:
8h and 1min - Average sunshine in May:
8h and 2min - Average sunshine in June:
9h and 1min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 2min - Average sunshine in September:
8h and 3min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 5min
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 48min).
Average sunshine days
Old Mystic, CT
- Average sunshine days in January:
16.5 days - Average sunshine days in February:
13 days - Average sunshine days in March:
13.5 days - Average sunshine days in April:
12.7 days - Average sunshine days in May:
12.8 days - Average sunshine days in June:
11.7 days
- Average sunshine days in July:
11.5 days - Average sunshine days in August:
12.6 days - Average sunshine days in September:
15.4 days - Average sunshine days in October:
15.3 days - Average sunshine days in November:
17.7 days - Average sunshine days in December:
15.5 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is July (11.5 days).
Average UV index
Old Mystic, CT
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).
Average cloud cover
Old Mystic, CT
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility
Old Mystic, CT
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).