Glastonbury Climate by Month
Glastonbury, Connecticut, United States
Warm summers and cold winters, with rain spread through the year.
Glastonbury has warm summers and cold winters, with rain spread through the year. July is the warmest month, with highs around 85°F (29°C); January is the coolest at 37°F (3°C), and nights dip to 19°F (-7°C). It gets 45 in (1137 mm) of rain a year, spread across the months.
- Warmest month
- 85°F(29°C)
- Average high, July
- Coldest nights
- 19°F(-7°C)
- Average low, January
- Rain per year
- 45 in(1137 mm)
- No clear rainy season
- Humidity
- 69%
- Sunniest: July
Best and worst months in Glastonbury
Best for weatherThe most comfortable weather comes in May and September, with highs around 74°F (23°C) and about 3.8 in (97 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 37°F (3°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Glastonbury weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 37°F(3°C) | 19°F(-7°C) | 3.3 in(84 mm) | 77% | 1.7 |
| FebFebruary | 39°F(4°C) | 20°F(-6°C) | 3.1 in(78 mm) | 72% | 2.6 |
| MarMarch | 47°F(9°C) | 28°F(-2°C) | 3.9 in(99 mm) | 65% | 3.5 |
| AprApril | 59°F(15°C) | 38°F(3°C) | 3.9 in(98 mm) | 60% | 4.5 |
| MayMayBest | 71°F(22°C) | 48°F(9°C) | 3.6 in(91 mm) | 64% | 5.2 |
| JunJune | 80°F(26°C) | 57°F(14°C) | 4.2 in(107 mm) | 68% | 5.6 |
| JulJuly | 85°F(29°C) | 63°F(17°C) | 3.8 in(97 mm) | 70% | 5.7 |
| AugAugust | 83°F(29°C) | 62°F(17°C) | 3.4 in(86 mm) | 69% | 5.1 |
| SepSeptemberBest | 76°F(25°C) | 54°F(12°C) | 4.1 in(103 mm) | 70% | 4.0 |
| OctOctober | 65°F(18°C) | 43°F(6°C) | 4.0 in(102 mm) | 71% | 2.7 |
| NovNovember | 53°F(12°C) | 34°F(1°C) | 3.5 in(88 mm) | 62% | 1.8 |
| DecDecember | 42°F(6°C) | 25°F(-4°C) | 4.1 in(104 mm) | 76% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate outside the United States
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