Weather in Waterbury, Connecticut
Roses open along the stoops. Day 59 of spring. Read this microseason across nine climate regions →
- TodayMay 16Foggy—79°48°
- SundayMay 17Overcast—88°61°
- MondayMay 18Overcast—80°57°
- TuesdayMay 19Light Drizzle18%93°57°
- WednesdayMay 20Showers81%90°53°
- ThursdayMay 21Overcast17%71°49°
- FridayMay 22Light Drizzle14%62°45°
- PM 2.5
- 11.2 μg/m³
- PM 10
- 13.6 μg/m³
- NO₂
- 14.9 μg/m³
- Ozone
- 88.0 μg/m³
- UV Index
- 0.0 Low
When the dew is on the grass, rain will never come to pass.
- Moonrise
- 9:33 AM
- Moonset
- 12:33 AM
- In sign
- ♊︎ Gemini
Roses open along the stoops
Waterbury at a glance
- Today vs. normal: 6°F below the seasonal normal for this latitude
- Last frost: April 25 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Warm-season window is open
As of May 17, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
July brings Waterbury's warmest temperatures (~73°F mean) while January delivers the coldest (~28°F). Rainfall reaches its peak in October (4.5 inches) and drops to its lowest point in February (2.9 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 28° | 3.0″ | 5 |
| February | 30° | 2.9″ | 5 |
| March | 38° | 4.0″ | 6 |
| April | 49° | 4.1″ | 7 |
| May | 59° | 3.5″ | 7 |
| June | 68° | 4.0″ | 7 |
| July | 73° | 3.4″ | 6 |
| August | 72° | 3.5″ | 6 |
| September | 65° | 4.3″ | 5 |
| October | 53° | 4.5″ | 6 |
| November | 42° | 3.4″ | 6 |
| December | 33° | 4.1″ | 7 |
Regional context
Waterbury belongs to a warm-summer humid continental climate region — sharing similar temperature ranges, seasonal patterns, and growing conditions with nearby cities.
Similar climates: Hartford, CT, Bridgeport, CT, New Haven, CT, Danbury, CT, Norwich, CT.
Naturalist notes
Red maple flowers emerge in late April, their crimson clusters appearing before the leaves unfurl.
American robins begin their dawn chorus in early May, marking the peak of spring migration.
Frequently asked
- When does it freeze in Waterbury?
- Waterbury's last spring frost typically occurs around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Waterbury?
- October receives the most rainfall with about 4.5 inches on average; the city gets roughly 45 inches annually.
- What is the warmest month in Waterbury?
- July typically brings the warmest weather, averaging about 73°F.
- What is the coldest month in Waterbury?
- January typically delivers the coldest temperatures, averaging about 28°F.
- When can I start a vegetable garden in Waterbury?
- Cool-season crops (peas, lettuce) can be planted around the last spring frost (mid-April); warm-season crops (tomatoes, peppers) should wait until 1–2 weeks after.
- How many rainy days does Waterbury get?
- Waterbury experiences about 74 rainy days per year on average.
- What hardiness zone is Waterbury?
- Waterbury's USDA hardiness zone depends on its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Waterbury, Connecticut experiences a warm-summer humid continental climate zone. January temperatures hover near 28°F while July averages 73°F — a 45°F seasonal swing.
Throughout the year, Waterbury receives about 45 inches of precipitation spread over roughly 74 rainy days.
Latitude (41.6°N), proximity to large water bodies, and elevation set the rhythm of the year — shaping what grows here, when frost is likely, and what the weather story looks like day to day.