Irondequoit, New York climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Irondequoit's center at January lows of 19°F and July highs of 79°F, a yearly mean of 48.9°F and 34.8 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Rochester (8 miles SW, 533 ft), has January lows of 19°F and July highs of 83°F.
50,438 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 33° 19°
- Feb 34° 20°
- Mar 42° 27°
- Apr 54° 37°
- May 66° 48°
- Jun 75° 58°
- Jul 79° 63°
- Aug 79° 62°
- Sep 72° 56°
- Oct 60° 45°
- Nov 48° 35°
- Dec 38° 26°
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 Irondequoit's center.
What is each month like in Irondequoit?
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. | Rochester high | Rochester low |
|---|---|---|---|---|---|---|
| January | 33°F | 19°F | 26.0°F | 2.46 | 33°F | 19°F |
| February | 34°F | 20°F | 27.0°F | 1.98 | 35°F | 20°F |
| March | 42°F | 27°F | 34.4°F | 2.40 | 44°F | 27°F |
| April | 54°F | 37°F | 45.3°F | 3.01 | 57°F | 37°F |
| May | 66°F | 48°F | 56.9°F | 2.97 | 69°F | 48°F |
| June | 75°F | 58°F | 66.5°F | 3.24 | 78°F | 57°F |
| July | 79°F | 63°F | 71.3°F | 3.36 | 83°F | 62°F |
| August | 79°F | 62°F | 70.4°F | 3.12 | 81°F | 61°F |
| September | 72°F | 56°F | 63.7°F | 3.22 | 74°F | 54°F |
| October | 60°F | 45°F | 52.0°F | 3.46 | 61°F | 43°F |
| November | 48°F | 35°F | 41.4°F | 2.82 | 49°F | 34°F |
| December | 38°F | 26°F | 32.1°F | 2.71 | 39°F | 25°F |
In metric: a yearly mean of 9.4°C, January lows of −7°C, July highs of 26°C and 883 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 Irondequoit 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 |
|---|---|---|---|---|---|---|---|---|
| RochesterFrederick Douglass Greater Rochester International Airport | 8 mi SW | 533 ft | 49.5°F | 19°F | 83°F | 35.1 | 102 | April 24 |
| Webster2 mi NE | 10 mi E | 275 ft | 48.7°F | 17°F | 81°F | 39.3 | 86 | May 1 |
| Victor2 mi NW | 16 mi SE | 588 ft | 48.5°F | 16°F | 81°F | – | – | May 2 |
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 Irondequoit?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Rochester (8 miles SW, 533 ft). It gets 102 inches of snow in a normal year. The last spring frost (32°F) comes after April 24 in half of years and the first autumn frost before October 25. Its record high is 102°F (1936) and its record low −22°F (1934), on the National Weather Service's long record for the area (kept since 1872).
The USDA's 2023 Plant Hardiness Zone Map puts Irondequoit in zone 6b across its 4 ZIP code areas.
Over a year 69% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (3.6 kWh per square metre a day, NASA POWER 2001-2020); August is the sunniest month (77%) and December the cloudiest (49%).
Rochester'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 Irondequoit; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USW00014768; records: ACIS; 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 Irondequoit, ZIP code by ZIP code?
4 ZIP code areas lie wholly or partly in Irondequoit. On NOAA's grid 14617 is the warmest (48.9°F a year) and 14621 the coolest (48.6°F), so the city is nearly uniform. 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 |
|---|---|---|---|---|---|---|---|---|
| 14609 | 6b | 48.7°F | 19°F | 81°F | 34.8 | Rochester (8 mi) | April 24 | October 25 |
| 14617 | 6b | 48.9°F | 19°F | 80°F | 34.7 | Rochester (9 mi) | April 24 | October 25 |
| 14621 | 6b | 48.6°F | 18°F | 81°F | 34.9 | Rochester (6 mi) | April 24 | October 25 |
| 14622 | 6b | 48.9°F | 19°F | 79°F | 34.8 | Webster (8 mi) | May 1 | October 20 |
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.