Broad Brook, Connecticut Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Broad Brook weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——86°57°—
- FridayJun 5Overcast——90°60°+4°
- SaturdayJun 6Light Showers30%—92°63°+2°
- SundayJun 7Light Showers67%0.02″81°62°-11°
- MondayJun 8Light Drizzle18%0.01″78°55°-3°
- TuesdayJun 9Partly Cloudy——84°50°+6°
- WednesdayJun 10Mostly Clear——85°55°+1°
PM2.5 at 5.4 µg/m³ (AQI 30) with a 0.89 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust. AQI down 7 over the last 6 hours (steady decline since this morning).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 8 AM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 30 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 13 by mid-afternoon.
- Present
- AQI 30
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 13
PM × Wind × Precip
PM2.5 at 5.4 µg/m³ (AQI 30) with a 0.89 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.89
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 12:43 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Broad Brook at a glance
- Today vs. normal: 15°F below the seasonal normal for this latitude
- Last frost: April 27 (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.
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
Broad Brook's warmest month is July (~73°F mean) and its coldest is January (~25°F). Rainfall peaks in October (4.7 inches) and bottoms out in February (2.6 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 25° | 2.8″ | 5 |
| February | 28° | 2.6″ | 6 |
| March | 36° | 3.4″ | 6 |
| April | 48° | 4.1″ | 7 |
| May | 59° | 3.7″ | 8 |
| June | 67° | 4.4″ | 8 |
| July | 73° | 4.2″ | 7 |
| August | 71° | 3.7″ | 7 |
| September | 63° | 4.6″ | 6 |
| October | 51° | 4.7″ | 7 |
| November | 41° | 3.5″ | 6 |
| December | 31° | 3.6″ | 7 |
Regional context
Broad Brook 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 Broad Brook?
- Broad Brook's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Broad Brook?
- October is the wettest month with about 4.7 inches of rain on average; the city receives roughly 45 inches annually.
- What is the warmest month in Broad Brook?
- July is typically warmest, averaging about 73°F.
- What is the coldest month in Broad Brook?
- January is typically coldest, averaging about 25°F.
- When can I start a vegetable garden in Broad Brook?
- 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 Broad Brook get?
- Broad Brook averages about 78 rainy days per year.
- What hardiness zone is Broad Brook?
- Broad Brook'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
Broad Brook, Connecticut sits in a warm-summer humid continental climate zone. January means hover near 25°F while July averages 73°F — a 48°F seasonal swing.
Across the year, Broad Brook receives about 45 inches of precipitation spread over roughly 78 rainy days.
The rhythm of the year is set by latitude (41.9°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.