Ashtabula, Ohio climate: Normal weather by month, frost dates and records
Ashtabula's normal year runs from 19°F January nights to 81°F July afternoons, with 37.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.4°C, January lows of −7°C, July highs of 27°C, 942 mm of precipitation a year.
- NOAA stationAshtabula County Airport
- Station IDUSW00004857
- Location41.78°N 80.70°W
- Elevation924 ft (282 m)
- From the center9 miles
- Population17,775
On October 14, the normal high in Ashtabula is 62°F and the normal low 43°F, and the chance of measurable rain or snow is 49%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Ashtabula.
- Jan 33° 19°
- Feb 36° 19°
- Mar 44° 26°
- Apr 58° 36°
- May 69° 46°
- Jun 77° 55°
- Jul 81° 60°
- Aug 79° 58°
- Sep 73° 52°
- Oct 61° 42°
- Nov 49° 34°
- Dec 38° 26°
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 Ashtabula each month?
July is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 19°F. The most precipitation falls in July (4.27 in), the least in February (1.68 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. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 33°F | 19°F | 26.2°F | 1.90 | 14 | <1 | 26 | 9 h 30 min |
| February | 36°F | 19°F | 27.5°F | 1.68 | 11 | <1 | 25 | 10 h 30 min |
| March | 44°F | 26°F | 35.2°F | 2.36 | 13 | <1 | 23 | 11 h 50 min |
| April | 58°F | 36°F | 46.9°F | 3.36 | 14 | <1 | 10 | 13 h 20 min |
| May | 69°F | 46°F | 57.6°F | 3.30 | 14 | <1 | 1 | 14 h 30 min |
| June | 77°F | 55°F | 66.2°F | 3.68 | 13 | 2 | <1 | 15 h 10 min |
| July | 81°F | 60°F | 70.4°F | 4.27 | 13 | 3 | <1 | 15 h |
| August | 79°F | 58°F | 68.7°F | 3.57 | 14 | 1 | <1 | 14 h |
| September | 73°F | 52°F | 62.4°F | 3.85 | 14 | 1 | <1 | 12 h 30 min |
| October | 61°F | 42°F | 51.9°F | 3.68 | 16 | <1 | 2 | 11 h 10 min |
| November | 49°F | 34°F | 41.3°F | 3.10 | 14 | <1 | 13 | 9 h 50 min |
| December | 38°F | 26°F | 32.1°F | 2.32 | 15 | <1 | 23 | 9 h 10 min |
| Year (annual) | 58°F | 40°F | 48.9°F | 37.07 | 163 | 7 | 124 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 1°C | −7°C | −3.2°C | 48 mm |
| February | 2°C | −7°C | −2.5°C | 43 mm |
| March | 7°C | −3°C | 1.8°C | 60 mm |
| April | 14°C | 2°C | 8.3°C | 85 mm |
| May | 20°C | 8°C | 14.2°C | 84 mm |
| June | 25°C | 13°C | 19.0°C | 93 mm |
| July | 27°C | 15°C | 21.3°C | 108 mm |
| August | 26°C | 15°C | 20.4°C | 91 mm |
| September | 23°C | 11°C | 16.9°C | 98 mm |
| October | 16°C | 6°C | 11.1°C | 93 mm |
| November | 9°C | 1°C | 5.2°C | 79 mm |
| December | 3°C | −3°C | 0.1°C | 59 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Dorset (7 miles away), gets 90 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004857; 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 Ashtabula?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, July has the fewest days with rain (13).
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 USW00004857.
When is the last frost in Ashtabula?
In Ashtabula, the last spring frost (32°F) comes after May 2 in half of years and after May 20 in one year in ten; the first autumn frost comes before October 21 in half of years and before October 4 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
- May 21 year in 10 after May 20; 9 in 10 after April 18
- First autumn frost, half of years before
- October 211 year in 10 before October 4; 9 in 10 before November 5
NOAA puts the median frost-free season at 171 days, and the season without a hard freeze (28°F) at 198 days.
A hard freeze (28°F) comes after April 21 in half of springs and before November 3 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Ashtabula in zone 6b in ZIP code 44004. By the map's own method, the average of each year's coldest night over 1991-2020, Ashtabula's NOAA station is in zone 6a: the coldest night of a typical year reaches −7°F (22 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 USW00004857; 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 Ashtabula?
In a normal year in Ashtabula, 7 days a year reach 90°F, 124 nights fall to 32°F or colder and 163 days bring measurable precipitation.
- Days at 90°F or more
- 7a 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
- 44high of 32°F or less
- Days with 0.01 inch of precipitation
- 163a normal year
The highest temperature in this station's record (since 1998) is 97°F, on July 22, 2002; the lowest is −29°F, on February 20, 2015.
The wettest calendar year on that record is 2011, with 60.44 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00004857; records: ACIS (NOAA Regional Climate Centers), station USW00004857. Records use complete months only; a month missing more than three days is left out.
How sunny is Ashtabula?
Over a year 68% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Ashtabula, 3.6 kWh per square metre a day. July is the sunniest month (77%) and December the cloudiest (47%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 51% | 1.4 |
| February | 57% | 2.3 |
| March | 60% | 3.3 |
| April | 65% | 4.5 |
| May | 69% | 5.3 |
| June | 74% | 5.9 |
| July | 77% | 5.9 |
| August | 77% | 5.2 |
| September | 74% | 4.2 |
| October | 64% | 2.7 |
| November | 61% | 1.8 |
| December | 47% | 1.1 |
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 Ashtabula need?
A normal year in Ashtabula brings 6,372 heating degree days, 19% more than the median U.S. place (5,373), and 523 cooling degree days, 42% 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 2,608 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,204 | 0 |
| February | 1,050 | 0 |
| March | 923 | 0 |
| April | 547 | 4 |
| May | 260 | 31 |
| June | 68 | 105 |
| July | 16 | 183 |
| August | 25 | 139 |
| September | 133 | 53 |
| October | 415 | 8 |
| November | 711 | 0 |
| December | 1,021 | 0 |
| Year (annual) | 6,372 | 523 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004857. 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 Ashtabula been warmer than normal lately?
2025 averaged 49.1°F, 0.2°F above the 1991-2020 normal of 48.9°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 51.9°F | +3.0°F | 31.40 |
| 2022 | 50.1°F | +1.2°F | 30.20 |
| 2023 | 51.9°F | +3.0°F | – |
| 2025 | 49.1°F | +0.2°F | – |
Source: observed years: ACIS, station USW00004857. A year counts only with all twelve months complete.
How does Ashtabula's climate compare?
Ashtabula is warmer than 4 of the other 98 places with their own NOAA record in Ohio, and wetter than 11. Across the 7,247 U.S. stations with normals, its annual mean of 48.9°F is warmer than 36%.
In the Köppen classification computed from these normals, Ashtabula is Dfb: continental, no dry season, warm 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 Ashtabula share this climate record?
6 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.
- Geneva, OH5,871 people · 13 mi W
- Edgewood, OH4,265 people · 7 mi N
- Jefferson, OH3,188 people · 5 mi SW
- Saybrook-on-the-Lake, OH996 people · 11 mi NW
- Geneva-on-the-Lake, OH936 people · 14 mi W
- Austinburg, OH316 people · 8 mi W
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 Ashtabula's climate
What is the coldest month in Ashtabula?
January, with a normal high of 33°F and a normal low of 19°F. The warmest is July (81°F by day, 60°F at night).
Does it snow in Ashtabula?
Yes. NOAA publishes no 1991-2020 snowfall normal for Ashtabula's NOAA station; the nearest record that keeps one, Dorset (7 miles away), records 90 inches of snow in a normal year.
What is the rainiest month in Ashtabula?
July, with 4.27 in of precipitation in a normal year; the driest is February with 1.68 in.
What plant hardiness zone is Ashtabula in?
The USDA's 2023 map puts Ashtabula in zone 6b in ZIP code 44004. By the same method at Ashtabula's NOAA station, the coldest night of a typical year reaches −7°F (22 years, 1991-2020): zone 6a.
How late can frost come in Ashtabula?
In half of years the last 32°F night comes after May 2; in one year in ten it comes after May 20. Waiting until May 20 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Ashtabula in OctoberThis month day by day, its records and recent years
- Ohio climateThe statewide normals and every place in the state
- Dorset, OH7 miles from this station, 47.8°F a year
- Springboro, PA14 miles from this station, 47.5°F a year
- Linesville, PA17 miles from this station, 48.3°F a year
- Jamestown, PA22 miles from this station, 48.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made