Weather in West Haven, Connecticut
Roses open along the stoops. Day 59 of spring. Read this microseason across nine climate regions →
- TodayMay 17Overcast—88°62°
- MondayMay 18Overcast—69°56°
- TuesdayMay 19Foggy—89°56°
- WednesdayMay 20Showers77%91°58°
- ThursdayMay 21Overcast24%71°52°
- FridayMay 22Light Drizzle16%59°48°
- SaturdayMay 23Drizzle24%52°48°
- PM 2.5
- 13.3 μg/m³
- PM 10
- 18.0 μg/m³
- NO₂
- 6.4 μg/m³
- Ozone
- 108.0 μg/m³
- UV Index
- 0.0 Low
When the dew is on the grass, rain will never come to pass.
- Moonrise
- 9:34 AM
- Moonset
- 12:32 AM
- In sign
- ♊︎ Gemini
Roses open along the stoops
West Haven at a glance
- Today vs. normal: 7°F below the seasonal normal for this latitude
- Last frost: April 24 (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
West Haven's warmest month is July (~74°F mean) and its coldest is January (~31°F). Rainfall peaks in April (4.2 inches) and bottoms out in January (2.7 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 31° | 2.7″ | 5 |
| February | 32° | 2.8″ | 6 |
| March | 39° | 3.7″ | 6 |
| April | 49° | 4.2″ | 7 |
| May | 59° | 3.5″ | 7 |
| June | 68° | 3.5″ | 7 |
| July | 74° | 3.4″ | 6 |
| August | 73° | 3.5″ | 6 |
| September | 66° | 4.0″ | 5 |
| October | 55° | 3.8″ | 7 |
| November | 45° | 3.1″ | 6 |
| December | 36° | 3.5″ | 7 |
Regional context
West Haven sits within a warm-summer humid continental climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Hartford, CT, Bridgeport, CT, New Haven, CT, Waterbury, CT, Danbury, CT.
Frequently asked
- When does it freeze in West Haven?
- West Haven's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in West Haven?
- April is the wettest month with about 4.2 inches of rain on average; the city receives roughly 42 inches annually.
- What is the warmest month in West Haven?
- July is typically warmest, averaging about 74°F.
- What is the coldest month in West Haven?
- January is typically coldest, averaging about 31°F.
- When can I start a vegetable garden in West Haven?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-April); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does West Haven get?
- West Haven averages about 74 rainy days per year.
- What hardiness zone is West Haven?
- West Haven's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
West Haven, Connecticut sits in a warm-summer humid continental climate zone. January means hover near 31°F while July averages 74°F — a 43°F seasonal swing.
Across the year, West Haven receives about 42 inches of precipitation spread over roughly 74 rainy days.
The rhythm of the year is set by latitude (41.3°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.