Ansonia, Connecticut Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Ansonia weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——85°54°—
- FridayJun 5Overcast——91°62°+6°
- SaturdayJun 6Heavy Showers26%0.38″93°63°+2°
- SundayJun 7Light Drizzle26%0.01″87°67°-6°
- MondayJun 8Light Drizzle—0.01″74°55°-13°
- TuesdayJun 9Overcast——83°50°+9°
- WednesdayJun 10Overcast——88°57°+5°
Ozone at AQI 86 now. AQI flat over the last 6 hours (within ±3 points). With UV 8.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 94 by mid-afternoon.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 86 now. With UV 8.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 94 by mid-afternoon.
- Present
- AQI 86
- UV peak
- 8.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 94
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:24 AM
- Moonset
- 12:47 PM
- In sign
- ♒︎ Aquarius
Fireflies rise from the lawn
Ansonia at a glance
- Today vs. normal: 10°F above the seasonal normal for this latitude
- Last frost: April 24 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Ansonia
SPC has placed Ansonia in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3MRGLMarginal Risk
Isolated severe storms possible. Limited threat for hail or damaging wind.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
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
Ansonia'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
Ansonia 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 Ansonia?
- Ansonia's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Ansonia?
- 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 Ansonia?
- July is typically warmest, averaging about 74°F.
- What is the coldest month in Ansonia?
- January is typically coldest, averaging about 31°F.
- When can I start a vegetable garden in Ansonia?
- 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 Ansonia get?
- Ansonia averages about 74 rainy days per year.
- What hardiness zone is Ansonia?
- Ansonia'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
Ansonia, 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, Ansonia 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.