Westerville, Ohio climate: Normal weather by month, frost dates and records
Westerville's normal year runs from 22°F January nights to 86°F July afternoons, with 42.2 inches of precipitation and 19 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.2°C, January lows of −6°C, July highs of 30°C, 1,073 mm of precipitation a year.
- NOAA stationWesterville
- Station IDUSC00338951
- Location40.13°N 82.94°W
- Elevation802 ft (244 m)
- From the center2 miles
- Population38,612
On October 23, the normal high in Westerville is 64°F and the normal low 42°F, and the chance of measurable rain or snow is 36%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Westerville.
- Jan 38° 22°
- Feb 42° 24°
- Mar 53° 32°
- Apr 66° 42°
- May 76° 52°
- Jun 83° 61°
- Jul 86° 65°
- Aug 85° 63°
- Sep 79° 56°
- Oct 67° 45°
- Nov 53° 35°
- Dec 42° 27°
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 Westerville each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 22°F. The most precipitation falls in June (5.02 in), the least in February (2.36 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 38°F | 22°F | 29.9°F | 2.93 | 6.9 | 13 | <1 | 25 | 9 h 40 min |
| February | 42°F | 24°F | 33.0°F | 2.36 | 5.3 | 11 | <1 | 22 | 10 h 40 min |
| March | 53°F | 32°F | 42.3°F | 3.42 | 2.8 | 12 | <1 | 18 | 11 h 50 min |
| April | 66°F | 42°F | 54.1°F | 3.91 | 0.1 | 14 | <1 | 5 | 13 h 10 min |
| May | 76°F | 52°F | 63.9°F | 4.22 | 0.0 | 14 | 1 | <1 | 14 h 20 min |
| June | 83°F | 61°F | 72.2°F | 5.02 | 0.0 | 12 | 5 | <1 | 15 h |
| July | 86°F | 65°F | 75.4°F | 4.56 | 0.0 | 12 | 7 | <1 | 14 h 50 min |
| August | 85°F | 63°F | 73.8°F | 3.64 | 0.0 | 9 | 5 | <1 | 13 h 50 min |
| September | 79°F | 56°F | 67.6°F | 3.29 | 0.0 | 9 | 3 | <1 | 12 h 30 min |
| October | 67°F | 45°F | 56.0°F | 2.95 | 0.0 | 11 | <1 | 3 | 11 h 10 min |
| November | 53°F | 35°F | 44.2°F | 2.88 | 0.5 | 11 | <1 | 14 | 10 h |
| December | 42°F | 27°F | 34.6°F | 3.05 | 3.4 | 13 | <1 | 23 | 9 h 20 min |
| Year (annual) | 64°F | 44°F | 53.9°F | 42.23 | 19.0 | 140 | 20 | 110 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 3°C | −6°C | −1.2°C | 74 mm | 18 cm |
| February | 6°C | −4°C | 0.6°C | 60 mm | 13 cm |
| March | 11°C | 0°C | 5.7°C | 87 mm | 7 cm |
| April | 19°C | 5°C | 12.3°C | 99 mm | 0 cm |
| May | 24°C | 11°C | 17.7°C | 107 mm | 0 cm |
| June | 28°C | 16°C | 22.3°C | 128 mm | 0 cm |
| July | 30°C | 18°C | 24.1°C | 116 mm | 0 cm |
| August | 29°C | 17°C | 23.2°C | 92 mm | 0 cm |
| September | 26°C | 13°C | 19.8°C | 84 mm | 0 cm |
| October | 20°C | 7°C | 13.3°C | 75 mm | 0 cm |
| November | 12°C | 2°C | 6.8°C | 73 mm | 1 cm |
| December | 6°C | −3°C | 1.4°C | 77 mm | 9 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00338951; 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 Westerville?
Normal highs sit between 65°F and 85°F in April, May, June, August, September and October. 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 USC00338951.
When is the last frost in Westerville?
In Westerville, the last spring frost (32°F) comes after April 22 in half of years and after May 10 in one year in ten; the first autumn frost comes before October 24 in half of years and before October 10 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 221 year in 10 after May 10; 9 in 10 after April 9
- First autumn frost, half of years before
- October 241 year in 10 before October 10; 9 in 10 before November 5
NOAA puts the median frost-free season at 183 days, and the season without a hard freeze (28°F) at 207 days.
A hard freeze (28°F) comes after April 9 in half of springs and before November 3 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Westerville in zone 6b across its 2 ZIP code areas (6b in 43081, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Westerville's NOAA station is in zone 6a: the coldest night of a typical year reaches −6°F (25 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 USC00338951; 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.
What hardiness zone is each Westerville ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Westerville's 2 ZIP code areas are all in zone 6b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Westerville?
In a normal year in Westerville, 20 days a year reach 90°F, 110 nights fall to 32°F or colder and 140 days bring measurable precipitation.
- Days at 90°F or more
- 20a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 110a normal year
- Days that stay below freezing
- 27high of 32°F or less
- Days with 0.01 inch of precipitation
- 140a normal year
- Days with 1 inch of snow or more
- 7a normal year
The highest temperature in this station's record (since 1897) is 102°F, on July 14, 1954; the lowest is −27°F, on January 28, 1963.
The wettest calendar year on that record is 2018, with 59.85 in; the snowiest season is 1984–85, with 49.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00338951; records: ACIS (NOAA Regional Climate Centers), station USC00338951. Records use complete months only; a month missing more than three days is left out.
How sunny is Westerville?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Westerville, 3.9 kWh per square metre a day. August is the sunniest month (80%) and December the cloudiest (54%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 55% | 1.6 |
| February | 60% | 2.4 |
| March | 62% | 3.4 |
| April | 68% | 4.7 |
| May | 72% | 5.5 |
| June | 76% | 6.1 |
| July | 79% | 6.1 |
| August | 80% | 5.5 |
| September | 77% | 4.4 |
| October | 69% | 3.0 |
| November | 65% | 2.0 |
| December | 54% | 1.4 |
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 Westerville need?
A normal year in Westerville brings 5,108 heating degree days, 5% fewer than the median U.S. place (5,373), and 1,096 cooling degree days, 21% more 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 3,698 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,089 | 0 |
| February | 896 | 0 |
| March | 707 | 2 |
| April | 343 | 16 |
| May | 125 | 92 |
| June | 15 | 230 |
| July | 1 | 323 |
| August | 3 | 277 |
| September | 58 | 134 |
| October | 301 | 22 |
| November | 626 | 1 |
| December | 944 | 0 |
| Year (annual) | 5,108 | 1,096 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00338951. 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 Westerville been warmer than normal lately?
2025 averaged 53.2°F, 0.7°F below the 1991-2020 normal of 53.9°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 54.6°F | +0.7°F | 45.41 | 13.2 |
| 2022 | 53.2°F | −0.7°F | 45.31 | 14.6 |
| 2023 | 55.0°F | +1.1°F | 37.98 | 5.3 |
| 2024 | 56.2°F | +2.3°F | 37.78 | 7.9 |
| 2025 | 53.2°F | −0.7°F | 41.04 | 18.1 |
Over 56 complete years from 1953 to 2025, the station's annual mean temperature rose at a fitted 4.1°F per century (+0.23°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00338951; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Westerville's climate compare?
Westerville is warmer than 90 of the other 98 places with their own NOAA record in Ohio, and wetter than 56. Across the 7,247 U.S. stations with normals, its annual mean of 53.9°F is warmer than 57%.
In the Köppen classification computed from these normals, Westerville 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 Westerville share this climate record?
5 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.
- Sunbury, OH9,705 people · 9 mi N
- Huber Ridge, OH4,311 people · 3 mi SE
- Minerva Park, OH1,961 people · 3 mi S
- Galena, OH1,021 people · 8 mi NE
- Kilbourne, OH19 people · 14 mi N
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 Westerville's climate
What is the coldest month in Westerville?
January, with a normal high of 38°F and a normal low of 22°F. The warmest is July (86°F by day, 65°F at night).
Does it snow in Westerville?
Yes: 19 inches in a normal year, falling on 17 days with 0.1 inch or more, the most in January (6.9 inches).
What is the rainiest month in Westerville?
June, with 5.02 in of precipitation in a normal year; the driest is February with 2.36 in.
What plant hardiness zone is Westerville in?
The USDA's 2023 map puts Westerville in zone 6b across its 2 ZIP code areas (6b in 43081, the largest). By the same method at Westerville's NOAA station, the coldest night of a typical year reaches −6°F (25 years, 1991-2020): zone 6a.
How late can frost come in Westerville?
In half of years the last 32°F night comes after April 22; in one year in ten it comes after May 10. Waiting until May 10 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Westerville in OctoberThis month day by day, its records and recent years
- Ohio climateThe statewide normals and every place in the state
- Columbus Ohio State University Airport, OH8 miles from this station, 52.4°F a year
- Columbus WCMH, OH8 miles from this station, 52.8°F a year
- Columbus, OH10 miles from this station, 53.5°F a year
- Marysville, OH17 miles from this station, 52.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made