Norwalk, Ohio climate: Normal weather by month, frost dates and records
Norwalk's normal year runs from 19°F January nights to 83°F July afternoons, with 40.1 inches of precipitation and 33 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.3°C, January lows of −7°C, July highs of 28°C, 1,018 mm of precipitation a year.
- NOAA stationNorwalk Wastewater Treatment Plant
- Station IDUSC00336118
- Location41.27°N 82.62°W
- Elevation670 ft (204 m)
- Population17,172
On October 14, the normal high in Norwalk is 64°F and the normal low 44°F, and the chance of measurable rain or snow is 34%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Norwalk.
- Jan 33° 19°
- Feb 36° 20°
- Mar 46° 28°
- Apr 59° 38°
- May 70° 50°
- Jun 79° 60°
- Jul 83° 64°
- Aug 81° 62°
- Sep 76° 55°
- Oct 63° 43°
- Nov 50° 34°
- Dec 39° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Norwalk each month?
July is the warmest month, with normal highs of 83°F; January the coldest, with normal lows of 19°F. The most precipitation falls in June (4.31 in), the least in February (2.31 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 33°F | 19°F | 26.2°F | 2.68 | 9.7 | 14 | <1 | 27 | 9 h 30 min |
| February | 36°F | 20°F | 28.3°F | 2.31 | 8.2 | 12 | <1 | 25 | 10 h 40 min |
| March | 46°F | 28°F | 36.7°F | 2.90 | 5.1 | 12 | <1 | 22 | 11 h 50 min |
| April | 59°F | 38°F | 48.4°F | 3.95 | 1.6 | 13 | <1 | 8 | 13 h 20 min |
| May | 70°F | 50°F | 60.1°F | 3.91 | 0.0 | 13 | 1 | <1 | 14 h 30 min |
| June | 79°F | 60°F | 69.5°F | 4.31 | 0.0 | 12 | 4 | <1 | 15 h 10 min |
| July | 83°F | 64°F | 73.3°F | 4.19 | 0.0 | 10 | 6 | <1 | 14 h 50 min |
| August | 81°F | 62°F | 71.4°F | 3.54 | 0.0 | 10 | 3 | <1 | 13 h 50 min |
| September | 76°F | 55°F | 65.0°F | 3.55 | 0.0 | 9 | 2 | <1 | 12 h 30 min |
| October | 63°F | 43°F | 53.3°F | 3.34 | 0.0 | 11 | <1 | 3 | 11 h 10 min |
| November | 50°F | 34°F | 41.7°F | 2.83 | 1.5 | 10 | <1 | 15 | 9 h 50 min |
| December | 39°F | 25°F | 31.8°F | 2.57 | 6.6 | 12 | <1 | 24 | 9 h 10 min |
| Year (annual) | 60°F | 41°F | 50.5°F | 40.08 | 32.7 | 138 | 15 | 124 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 1°C | −7°C | −3.2°C | 68 mm | 25 cm |
| February | 2°C | −6°C | −2.1°C | 59 mm | 21 cm |
| March | 8°C | −2°C | 2.6°C | 74 mm | 13 cm |
| April | 15°C | 3°C | 9.1°C | 100 mm | 4 cm |
| May | 21°C | 10°C | 15.6°C | 99 mm | 0 cm |
| June | 26°C | 15°C | 20.8°C | 109 mm | 0 cm |
| July | 28°C | 18°C | 22.9°C | 106 mm | 0 cm |
| August | 27°C | 16°C | 21.9°C | 90 mm | 0 cm |
| September | 24°C | 13°C | 18.3°C | 90 mm | 0 cm |
| October | 17°C | 6°C | 11.8°C | 85 mm | 0 cm |
| November | 10°C | 1°C | 5.4°C | 72 mm | 4 cm |
| December | 4°C | −4°C | −0.1°C | 65 mm | 17 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00336118; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Norwalk?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (9).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00336118.
When is the last frost in Norwalk?
In Norwalk, the last spring frost (32°F) comes after April 25 in half of years and after May 9 in one year in ten; the first autumn frost comes before October 25 in half of years and before October 11 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 251 year in 10 after May 9; 9 in 10 after April 11
- First autumn frost, half of years before
- October 251 year in 10 before October 11; 9 in 10 before November 7
NOAA puts the median frost-free season at 183 days, and the season without a hard freeze (28°F) at 206 days.
A hard freeze (28°F) comes after April 12 in half of springs and before November 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Norwalk in zone 6a in ZIP code 44857. By the map's own method, the average of each year's coldest night over 1991-2020, Norwalk's NOAA station is in zone 6b: the coldest night of a typical year reaches −4°F (29 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Ohio · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00336118; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Norwalk?
In a normal year in Norwalk, 15 days a year reach 90°F, 124 nights fall to 32°F or colder and 138 days bring measurable precipitation.
- Days at 90°F or more
- 15a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 124a normal year
- Days that stay below freezing
- 42high of 32°F or less
- Days with 0.01 inch of precipitation
- 138a normal year
- Days with 1 inch of snow or more
- 12a normal year
The highest temperature in this station's record (since 1894) is 108°F, on July 24, 1934; the lowest is −25°F, on February 20, 1929.
The wettest calendar year on that record is 2011, with 54.74 in; the snowiest season is 1909–10, with 82.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00336118; records: ACIS (NOAA Regional Climate Centers), station USC00336118. Records use complete months only; a month missing more than three days is left out.
How sunny is Norwalk?
Over a year 69% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Norwalk, 3.7 kWh per square metre a day. July is the sunniest month (79%) and January the cloudiest (51%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 51% | 1.4 |
| February | 56% | 2.2 |
| March | 62% | 3.4 |
| April | 66% | 4.5 |
| May | 69% | 5.3 |
| June | 75% | 6.0 |
| July | 79% | 6.0 |
| August | 78% | 5.3 |
| September | 76% | 4.2 |
| October | 67% | 2.8 |
| November | 62% | 1.8 |
| December | 51% | 1.2 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Norwalk need?
A normal year in Norwalk brings 6,083 heating degree days, 13% more than the median U.S. place (5,373), and 827 cooling degree days, 9% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,097 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,203 | 0 |
| February | 1,028 | 0 |
| March | 878 | 1 |
| April | 506 | 8 |
| May | 212 | 58 |
| June | 40 | 176 |
| July | 6 | 263 |
| August | 11 | 211 |
| September | 95 | 95 |
| October | 378 | 15 |
| November | 699 | 0 |
| December | 1,029 | 0 |
| Year (annual) | 6,083 | 827 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00336118. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Norwalk been warmer than normal lately?
2025 averaged 50.8°F, 0.3°F above the 1991-2020 normal of 50.5°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 52.6°F | +2.1°F | 39.15 | – |
| 2022 | 51.0°F | +0.5°F | 35.69 | – |
| 2023 | 52.5°F | +2.0°F | 41.05 | – |
| 2024 | 53.6°F | +3.1°F | 34.62 | 11.5 |
| 2025 | 50.8°F | +0.3°F | 31.91 | 22.0 |
Over 120 complete years from 1862 to 2025, the station's annual mean temperature rose at a fitted 1.9°F per century (+0.10°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00336118; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Norwalk's climate compare?
Norwalk is warmer than 27 of the other 98 places with their own NOAA record in Ohio, and wetter than 27. Across the 7,247 U.S. stations with normals, its annual mean of 50.5°F is warmer than 43%.
In the Köppen classification computed from these normals, Norwalk is Dfa: continental, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Norwalk share this climate record?
14 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Bellevue, OH8,166 people · 12 mi W
- Willard, OH6,106 people · 16 mi S
- New London, OH2,374 people · 17 mi SE
- Milan, OH1,341 people · 2 mi NE
- Monroeville, OH1,286 people · 5 mi W
- Holiday Lakes, OH868 people · 13 mi SW
- Berlin Heights, OH670 people · 8 mi NE
- North Fairfield, OH455 people · 11 mi S
- New Haven, OH439 people · 17 mi S
- Collins, OH359 people · 7 mi E
- Flat Rock, OH337 people · 13 mi W
- Mitiwanga, OH276 people · 11 mi NE
- Celeryville, OH152 people · 17 mi S
- Beulah Beach, OH110 people · 12 mi NE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Norwalk's climate
What is the coldest month in Norwalk?
January, with a normal high of 33°F and a normal low of 19°F. The warmest is July (83°F by day, 64°F at night).
Does it snow in Norwalk?
Yes: 33 inches in a normal year, falling on 25 days with 0.1 inch or more, the most in January (9.7 inches).
What is the rainiest month in Norwalk?
June, with 4.31 in of precipitation in a normal year; the driest is February with 2.31 in.
What plant hardiness zone is Norwalk in?
The USDA's 2023 map puts Norwalk in zone 6a in ZIP code 44857. By the same method at Norwalk's NOAA station, the coldest night of a typical year reaches −4°F (29 years, 1991-2020): zone 6b.
How late can frost come in Norwalk?
In half of years the last 32°F night comes after April 25; in one year in ten it comes after May 9. Waiting until May 9 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Ohio climateThe statewide normals and every place in the state
- Sandusky, OH14 miles from this station, 52.0°F a year
- Oberlin, OH21 miles from this station, 50.1°F a year
- Elyria, OH24 miles from this station, 50.2°F a year
- Fremont, OH27 miles from this station, 50.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made