Climate and monthly weather forecastGlastonbury, CT
Climate and monthly weather forecast
The climate of Glastonbury
A small town in Connecticut, USA, Glastonbury is categorized under the Dfa type according to the Köppen climate classification. This classification suggests a humid continental climate with no dry season and a hot summer. Throughout the year, the weather shifts from cold snowy winters to hot, humid summers with heavy rainfall.Based on collected data, there is clear differentiation between the highest temperature, which can reach up to 83.1°F (28.4°C) in July, and the lowest hitting 21.2°F (-6°C) in January. Relative humidity oscillates mildly, staying within the range from 70% to 79%. Monthly avergare rainfall varies from 1.93" (49mm) in September to 3.19" (81mm) in December. In terms of snowfall, January and February witness the heaviest coverage with 2.83" (72mm) and 4.45" (113mm) respectively. Snowfall days range from zero in summer months to a peak of 8.1 days in February.
Days are longest in June with a daylight average of 15.2 hours, and shortest in December with 9.2 hours. Sunshine hours vary from around 4.8 hours in December to 10.4 hours from July to August. Despite the variation in daylight, visibility remains consistently at an average of 6 miles. Cloud coverage swings from 33% in August to 49% in February. Air pressure sees minor fluctuations, staying approximately between 29.93Hg and 30.09Hg. Wind speeds follow a similar pattern ranging from 5.3mph (8.5km/h) to 8.1mph (13km/h).
Interestingly, Glastonbury experiences its highest rainfall in December, a time when most places are experiencing snow. Also, while the summer months are hot, they are also the windiest, providing some relief from the heat.
The best time to visit Glastonbury
Judging by climate characteristics, the best time to visit Glastonbury would arguably be between late spring and early fall. During the months of May to September, the weather is moderately warm to hot, with temperatures ranging from 56.7°F (13.7°C) to 81°F (27.2°C). Moreover, this period witnesses abundant sunshine hours, from 8.4 hours in May to 10.4 hours in August. Rainfall during these months is frequent yet not excessively heavy.The worst time to visit Glastonbury
The coldest, and arguably the least pleasant time to be outdoors in Glastonbury, is in winter. December through February see the lowest temperatures, with January being the coldest with 21.2°F (-6°C). Additionally, these months record the highest snowfall, with February topping the chart at 4.45" (113mm). The lower sunshine hours, ranging from 4.8 to 5.1 hours, make the days feel shorter and colder.Spring weather in Glastonbury
In Glastonbury, spring starts with cooler temperatures and gradually gets warmer. The lowest temperature in March is 29.5°F (-1.4°C) while by May it rises to 49.5°F (9.7°C). Rainfall increases progressively from 2.6" (66mm) in March to 2.87" (73mm) in May. The weather becomes more appealing with longer daylight hours, from 12 hours in March to 14.5 hours in May and more sunshine as well, from 6.2 hours to 8.4 hours respectively.Summer weather in Glastonbury
Summers in Glastonbury are warm to hot, with temperatures ranging from 57°F (13.9°C) in June to 63.7°F (17.6°C) in July. Although July and August are the hottest months, they are also the windiest which provides some respite. Rainfall is slightly heavier with monthly averages ranging from 2.6" (66mm) to 2.99" (76mm). The longer daylight hours (from 15.2 hours in June to 14.8 hours in July) ensure plenty of time to enjoy outdoor activities.Autumn weather in Glastonbury
Temperatures start dropping during the autumn months, with values sliding from 55.6°F (13.1°C) in September to 36°F (2.2°C) in November. Rainfall takes a sharp turn from 1.93" (49mm) in September to 2.8" (71mm) in November. A decrease in daylight hours from 12.5 hours in September to 9.8 hours in November is noted. Sunshine hours also reduce, from 8.7 hours in September to 5.6 hours in November.Winter weather in Glastonbury
Winter in Glastonbury is characterized by low temperatures and remarkable snowfall. Temperatures can drop down to 21.2°F (-6°C) in January, however, daylight hours start to increase gradually from 9.2 hours in December to 10.6 hours by February. Sunshine hours remain low ranging from 4.8 hours in December to 4.6 hours in February. The heaviest snowfall occurs in February with 4.45" (113mm).Weather in January
Unpredictable could be the watchword in January for Glastonbury’s weather. Contrasted with February, the conditions are slightly milder with the lowest temperatures reported between 21.2°F (-6°C) and 33.4°F (0.8°C). This month holds the potential for both sunshine and snowfall. Weather in January »Weather in February
February carries over the winter vibe from January, with noticeably guaranteed frosts. The month is characterised by the highest snowfall of 4.45" (113mm), often causing a glistening white blanket over Glastonbury. The steadily increasing daylight hours hint towards the approach of Spring. Weather in February »Weather in March
Emerging from February, Glastonbury experiences moderate increases in temperature during March. The weather pattern transitions from the blank canvas of winter whites to the colourful awakenings of spring. Increased daylight hours favor outdoor activities. Weather in March »Weather in April
In April, Glastonbury transitions to full spring, characterized by a refreshing warmth and extended daylight hours. This increased daylight, between 39.9°F (4.4°C) to 56.7°F (13.7°C), elevates the number of sunny days. It is a time for landscapes to flourish and for residents to indulgence in outdoor activities. Weather in April »Weather in May
May brings a decided shift to warmer conditions in Glastonbury, with temperature and humidity levels on the rise. Radiant days become more frequent, underlining the city’s quintessential spring weather. The ample hours of daylight transform the city into a vibrant landscape, perfect for outdoor exploration. Weather in May »Weather in June
June sets the stage for the arrival of summer with temperatures climbing noticeable from last month. With Glastonbury basking in maximum daylight hours reaching up to 15.2 hours, it is the longest days of the year. The rising sunshine hours combined with an average temperature range make it ideal for spending time outdoors. Weather in June »Weather in July
July in Glastonbury, CT is at the peak of its summer, both in terms of temperature and daylight hours. The highest temperature is recorded in the summer with an average hovering from 63.7°F (17.6°C) to 83.1°F (28.4°C), truly signifying it as the warmest month of the year. Weather in July »Weather in August
In August, as compared to July, Glastonbury experiences a minor drop in temperature and daylight hours. The city still resonates with summer fervor, aided by the persistent warmth. The humidity begins to decline gradually, making way for more tolerable heat levels. Weather in August »Weather in September
September carries the transitional weather from Summer into Fall in Glastonbury. The temperature starts to dip appreciatively from August, experiencing the range of 55.6°F (13.1°C) to 73.4°F (23°C), indicating a shift to cooler days ahead. Weather in September »Weather in October
October in Glastonbury witnesses the full bloom of Fall, with cooler temperatures and decreased daylight hours. Despite the reduction in temperature, the beauty of the Fall foliage colors becomes the town's main attraction. Longer stretches of overcast skies are complemented by the crisp fall air, hinting at the approaching winter. Weather in October »Weather in November
November in Glastonbury marks the shift to winter with a substantial decrease in temperature and sunlight. As the leftover colors of fall fade away, temperatures dip markedly between 36°F (2.2°C) and 48.9°F (9.4°C). The shortened daylight hours and a gradual decrease in relative humidity become evident. Weather in November »Weather in December
December brings the full onset of Winter in Glastonbury, with noticeably shorter days and colder temperatures. With temperatures that range from 28.4°F (-2°C) to 39°F (3.9°C) combined with a noticeable increase in snowfall at 2.83" (72mm), the winter wonderland aesthetic comes to life in Glastonbury. Weather in December »Updated: Jul 1, 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
Glastonbury's January weather reaches an average high of 33.4°F (0.8°C) and an average low of 21.2°F (-6°C), making it the coldest month.
In Glastonbury, Connecticut, during the entire year, the rain falls for 164.5 days and collects up to 32.09" (815mm) of precipitation.
January through May, November and December are months with snowfall.
Throughout the year, there are 29.1 snowfall days, and 15.63" (397mm) of snow is accumulated.
February is the most humid month, with an average relative humidity of 79%.
February is the month with the most snowfall. Snow falls for 8.1 days and accumulates 4.45" (113mm) of snow.
February has the least sunshine of the year, with an average of 4.6h of sunshine.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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.
The least humid month in Glastonbury, Connecticut, is April, with an average relative humidity of 70%.
June through October are months without snowfall in Glastonbury.
The month with the longest days is June, with an average of 15h and 12min of daylight.
The months with the highest UV index are June and July, with an average maximum UV index of 6.
Glastonbury records the warmest temperatures in July, averaging a high of 83.1°F (28.4°C) and a low of 63.7°F (17.6°C).
July and August, with an average of 10.4h of sunshine, are months with the most sunshine.
September is the month with the least rainfall. Rain falls for 12.8 days and accumulates 1.93" (49mm) of precipitation.
The month with the most rainfall is December, when the rain falls for 11.3 days and typically aggregates up to 3.19" (81mm) of precipitation.
The month with the shortest days is December, with an average of 9h and 12min of daylight.
December is the month with the lowest UV index in Glastonbury, with an average maximum UV index of 1.
Average temperature
Glastonbury, CT
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (33.4°F).
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure
Glastonbury, CT
- Average pressure in January:
30.03"Hg - Average pressure in February:
30.01"Hg - Average pressure in March:
30.04"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:
30.06"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.05"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Glastonbury, CT
- Average wind speed in January:
8.1mph - Average wind speed in February:
8mph - Average wind speed in March:
8.1mph - Average wind speed in April:
7.8mph - Average wind speed in May:
6.5mph - Average wind speed in June:
5.8mph
- Average wind speed in July:
5.3mph - Average wind speed in August:
5.3mph - Average wind speed in September:
5.8mph - Average wind speed in October:
7mph - Average wind speed in November:
7.3mph - Average wind speed in December:
7.8mph
The windiest months (with the highest average wind speed) are January and March (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity
Glastonbury, CT
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (70%).
Average rainfall
Glastonbury, CT
- Average rainfall in January:
2.2" - Average rainfall in February:
2.24" - Average rainfall in March:
2.6" - Average rainfall in April:
2.87" - Average rainfall in May:
2.6" - Average rainfall in June:
2.87"
- Average rainfall in July:
2.99" - Average rainfall in August:
2.72" - Average rainfall in September:
1.93" - Average rainfall in October:
3.07" - Average rainfall in November:
2.8" - Average rainfall in December:
3.19"
The wettest month (with the highest rainfall) is December (3.19").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days
Glastonbury, CT
- Average rainfall days in January:
9.2 days - Average rainfall days in February:
9.6 days - Average rainfall days in March:
12.5 days - Average rainfall days in April:
14.9 days - Average rainfall days in May:
17.3 days - Average rainfall days in June:
17.3 days
- Average rainfall days in July:
17.6 days - Average rainfall days in August:
17 days - Average rainfall days in September:
12.8 days - Average rainfall days in October:
14.5 days - Average rainfall days in November:
10.5 days - Average rainfall days in December:
11.3 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is January (9.2 days).
Average snowfall
Glastonbury, CT
- Average snowfall in January:
2.87" - Average snowfall in February:
4.45" - Average snowfall in March:
3.7" - Average snowfall in April:
0.79" - Average snowfall in May:
0.31" - Average snowfall in June:
0"
The month with the highest snowfall is February (4.45").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days
Glastonbury, CT
- Average snowfall days in January:
7.1 days - Average snowfall days in February:
8.1 days - Average snowfall days in March:
5.8 days - Average snowfall days in April:
1.1 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:
0.1 days - Average snowfall days in November:
1.4 days - Average snowfall days in December:
5.3 days
The month with the highest number of snowfall days is February (8.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Glastonbury, CT
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 12min
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 12min).
- Average sunshine in January:
5h and 6min - Average sunshine in February:
4h and 36min - Average sunshine in March:
6h and 12min - Average sunshine in April:
8h and 18min - Average sunshine in May:
8h and 24min - Average sunshine in June:
9h and 18min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
10h and 24min - Average sunshine in September:
8h and 42min - Average sunshine in October:
5h and 54min - Average sunshine in November:
5h and 36min - Average sunshine in December:
4h and 48min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days
Glastonbury, CT
- Average sunshine days in January:
17.6 days - Average sunshine days in February:
13.6 days - Average sunshine days in March:
13.5 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
11 days - Average sunshine days in June:
10.7 days
- Average sunshine days in July:
11.5 days - Average sunshine days in August:
11.4 days - Average sunshine days in September:
13.9 days - Average sunshine days in October:
14.7 days - Average sunshine days in November:
17.1 days - Average sunshine days in December:
15.5 days
The month with the most sunshine days is January (17.6 days).
The month with the least sunshine days is June (10.7 days).
Average UV index
Glastonbury, CT
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Glastonbury, CT
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
Glastonbury, CT
The months with the highest visibility are January, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are February, May and September (5mi).
