Norwich, Connecticut Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Norwich weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——84°53°—
- FridayJun 5Overcast——88°56°+4°
- SaturdayJun 6Overcast31%—88°62°0°
- SundayJun 7Light Showers59%0.01″82°59°-6°
- MondayJun 8Overcast21%—76°53°-6°
- TuesdayJun 9Clear——82°50°+6°
- WednesdayJun 10Mostly Clear——82°55°0°
PM2.5 at 7.5 µg/m³ (AQI 42) with a 0.78 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust. AQI flat over the last 6 hours (within ±4 points).
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 38 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 17 by mid-afternoon.
- Present
- AQI 38
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 17
PM × Wind × Precip
PM2.5 at 7.5 µg/m³ (AQI 42) with a 0.78 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.78
- Wind
- calm
- 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
- 3:21 AM
- Moonset
- 12:42 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Norwich at a glance
- Today vs. normal: 20°F below the seasonal normal for this latitude
- Last frost: April 25 (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 — Norwich
SPC has placed Norwich 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
July stands as Norwich's warmest month with average temperatures around 74°F, while January brings the coldest conditions at approximately 30°F. Precipitation follows its own seasonal pattern, with March delivering the heaviest rainfall at 5.1 inches and July recording the lightest at 3.6 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 30° | 3.9″ | 7 |
| February | 32° | 3.8″ | 6 |
| March | 39° | 5.1″ | 7 |
| April | 49° | 4.7″ | 7 |
| May | 59° | 3.6″ | 7 |
| June | 68° | 4.3″ | 6 |
| July | 74° | 3.6″ | 6 |
| August | 73° | 4.4″ | 6 |
| September | 65° | 4.8″ | 6 |
| October | 54° | 4.9″ | 6 |
| November | 44° | 4.2″ | 6 |
| December | 35° | 5.0″ | 7 |
Regional context
Norwich falls within the warm-summer humid continental climate region, sharing temperature ranges, seasonal patterns, and growing conditions with other cities in this climate zone.
Similar climates: Hartford, CT, Bridgeport, CT, New Haven, CT, Waterbury, CT, Danbury, CT.
Naturalist notes
Late May brings the distinctive calls of Baltimore orioles as they establish territories in Norwich's mature oak and maple trees.
Sugar maples begin their leaf-out phase during the third week of April, their tender green foliage emerging just as soil temperatures reach consistent warmth.
Frequently asked
- When does it freeze in Norwich?
- Spring's final frost in Norwich typically occurs around mid-April, while the season's first frost returns around mid-November.
- What is the rainy season in Norwich?
- March delivers the heaviest precipitation with approximately 5.1 inches of rain on average, contributing to Norwich's annual total of roughly 52 inches.
- What is the warmest month in Norwich?
- July typically records the highest temperatures, with averages around 74°F.
- What is the coldest month in Norwich?
- January brings the coldest temperatures, averaging about 30°F.
- When can I start a vegetable garden in Norwich?
- Gardeners can plant cool-season crops like peas and lettuce around the last spring frost in mid-April, while warm-season crops such as tomatoes and peppers should wait 1–2 weeks after.
- How many rainy days does Norwich get?
- Norwich experiences approximately 78 rainy days throughout the year.
- What hardiness zone is Norwich?
- Norwich's USDA hardiness zone depends on its lowest average winter temperature; the USDA's online lookup tool provides the current zone designation when you enter the city's ZIP code.
Climate
Norwich, Connecticut experiences a warm-summer humid continental climate zone. Winter temperatures in January typically hover near 30°F, while July brings average temperatures of 74°F — creating a 45°F seasonal swing.
Annual precipitation in Norwich totals about 52 inches, distributed across roughly 78 rainy days throughout the year.
Several factors determine Norwich's weather patterns: its latitude at 41.5°N, proximity to large water bodies, and local elevation. These elements influence growing seasons, frost timing, and daily weather conditions.