Waterbury, Connecticut climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Waterbury's center at January lows of 18°F and July highs of 83°F, a yearly mean of 49.5°F and 50.5 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Meriden (11 miles E, 103 ft), has January lows of 19°F and July highs of 84°F.
115,908 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 35° 18°
- Feb 38° 19°
- Mar 47° 26°
- Apr 59° 36°
- May 70° 46°
- Jun 78° 56°
- Jul 83° 61°
- Aug 81° 60°
- Sep 74° 52°
- Oct 62° 41°
- Nov 51° 32°
- Dec 40° 24°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
The months above are NOAA's gridded normals at Waterbury's center.
What is each month like in Waterbury?
NOAA's grid estimates the normals every 5 km or so from the stations around each point, terrain included. It smooths between stations, so night lows at the heart of a large city can run warmer than the grid shows: at five big-city airports we compared, the grid's highs were within about 1°F of the station and its lows 1-6°F cooler. The nearest record's high and low are beside each month.
| Month | High | Low | Mean | Precip. | Meriden high | Meriden low |
|---|---|---|---|---|---|---|
| January | 35°F | 18°F | 26.4°F | 3.66 | 37°F | 19°F |
| February | 38°F | 19°F | 28.7°F | 3.24 | 39°F | 20°F |
| March | 47°F | 26°F | 36.5°F | 4.27 | 48°F | 28°F |
| April | 59°F | 36°F | 47.4°F | 4.35 | 60°F | 38°F |
| May | 70°F | 46°F | 57.9°F | 3.86 | 70°F | 48°F |
| June | 78°F | 56°F | 66.7°F | 4.50 | 79°F | 57°F |
| July | 83°F | 61°F | 72.3°F | 4.19 | 84°F | 63°F |
| August | 81°F | 60°F | 70.3°F | 4.25 | 82°F | 61°F |
| September | 74°F | 52°F | 63.2°F | 4.64 | 75°F | 54°F |
| October | 62°F | 41°F | 51.6°F | 5.03 | 64°F | 42°F |
| November | 51°F | 32°F | 41.0°F | 4.09 | 52°F | 32°F |
| December | 40°F | 24°F | 31.9°F | 4.48 | 42°F | 25°F |
In metric: a yearly mean of 9.7°C, January lows of −8°C, July highs of 29°C and 1,284 mm of precipitation a year.
Source: NOAA NCEI U.S. Monthly Gridded Climate Normals 1991-2020 (nClimGrid, accession 0245564); NOAA NCEI 1991-2020 station normals. The grid cell holding the city's Census center point.
What do the station records around Waterbury say?
Each row is a NOAA station's own 1991-2020 normals, with the snow and frost dates the grid does not give. A record downhill or nearer the coast than the city can run warmer, one uphill cooler: compare the elevations.
| Record | Where | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| MeridenMeriden Markham Municipal Airport | 11 mi E | 103 ft | 50.7°F | 19°F | 84°F | 44.9 | – | April 26 |
| Mount Carmel | 13 mi SE | 180 ft | 51.7°F | 20°F | 85°F | 50.4 | – | April 18 |
| Ansonia1 mi NE | 15 mi S | 136 ft | 50.1°F | 18°F | 82°F | 52.0 | – | April 25 |
Source: NOAA NCEI 1991-2020 U.S. Climate Normals; place center and population: Census Bureau 2024. Last frost: the median last spring date of 32°F.
How much snow, how late a frost, what zone and how much sun in Waterbury?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Meriden (11 miles E, 103 ft). NOAA publishes no snowfall normal for it; the nearest record that has one, Burlington (17 miles away), gets 39 inches a year. The last spring frost (32°F) comes after April 26 in half of years and the first autumn frost before October 16.
The USDA's 2023 Plant Hardiness Zone Map puts Waterbury in zone 6b across its 6 ZIP code areas.
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (3.9 kWh per square metre a day, NASA POWER 2001-2020); July is the sunniest month (79%) and December the cloudiest (67%).
Meriden's page has its months, frost probabilities, records by month and recent years. NOAA's grid has monthly figures only, so there are no day-by-day month pages for Waterbury; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USW00054788; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; sunshine: NASA POWER.
How does the climate vary across Waterbury, ZIP code by ZIP code?
6 ZIP code areas lie wholly or partly in Waterbury. On NOAA's grid 06706 is the warmest (49.7°F a year) and 06704 the coolest (48.9°F), a spread of 0.8°F. Each row also names the nearest station record and its frost dates.
| ZIP code | Zone | Year | Jan low | Jul high | Precip. | Nearest record | Last frost | First frost |
|---|---|---|---|---|---|---|---|---|
| 06702 | 6b | 49.4°F | 17°F | 83°F | 50.3 | Meriden (12 mi) | April 26 | October 16 |
| 06704 | 6b | 48.9°F | 17°F | 82°F | 51.7 | Meriden (12 mi) | April 26 | October 16 |
| 06705 | 6b | 49.4°F | 18°F | 83°F | 51.0 | Meriden (9 mi) | April 26 | October 16 |
| 06706 | 6b | 49.7°F | 18°F | 83°F | 50.3 | Meriden (10 mi) | April 26 | October 16 |
| 06708 | 6b | 49.4°F | 17°F | 83°F | 50.3 | Meriden (13 mi) | April 26 | October 16 |
| 06710 | 6b | 49.4°F | 17°F | 83°F | 50.3 | Meriden (12 mi) | April 26 | October 16 |
Source: Census Bureau 2020 ZCTA-to-place relationship file and ZCTA centers; NOAA NCEI gridded and station normals, 1991-2020. A ZIP area counts when at least a tenth of its land (and 0.5 km²) is in the city; its figures are the grid cell at its center; frost dates are the nearest record's medians of 32°F.