Blackwell, Oklahoma climate: Normal weather by month, frost dates and records
Blackwell's normal year runs from 22°F January nights to 94°F July afternoons, with 38.8 inches of precipitation and 8 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 14.6°C, January lows of −5°C, July highs of 34°C, 986 mm of precipitation a year.
- NOAA stationBlackwell (1 mi SSW)
- Station IDUSC00340818
- Location36.78°N 97.29°W
- Elevation1,033 ft (315 m)
- From the center1 miles
- Population6,016
On October 23, the normal high in Blackwell is 70°F and the normal low 44°F, and the chance of measurable rain or snow is 20%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Blackwell.
- Jan 47° 22°
- Feb 52° 26°
- Mar 61° 34°
- Apr 71° 44°
- May 79° 55°
- Jun 89° 65°
- Jul 94° 69°
- Aug 93° 68°
- Sep 85° 60°
- Oct 73° 47°
- Nov 60° 34°
- Dec 49° 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 Blackwell each month?
July is the warmest month, with normal highs of 94°F; January the coldest, with normal lows of 22°F. The most precipitation falls in May (5.39 in), the least in January (1.25 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 47°F | 22°F | 34.6°F | 1.25 | 2.0 | 5 | <1 | 27 | 9 h 50 min |
| February | 52°F | 26°F | 38.7°F | 1.41 | 1.7 | 5 | <1 | 20 | 10 h 50 min |
| March | 61°F | 34°F | 47.8°F | 2.83 | 1.4 | 7 | <1 | 11 | 11 h 50 min |
| April | 71°F | 44°F | 57.2°F | 3.92 | 0.1 | 8 | 1 | 3 | 13 h 10 min |
| May | 79°F | 55°F | 67.1°F | 5.39 | 0.0 | 9 | 4 | <1 | 14 h 10 min |
| June | 89°F | 65°F | 76.8°F | 5.14 | 0.0 | 9 | 14 | <1 | 14 h 40 min |
| July | 94°F | 69°F | 81.5°F | 4.38 | 0.0 | 8 | 23 | <1 | 14 h 30 min |
| August | 93°F | 68°F | 80.2°F | 4.12 | 0.0 | 8 | 21 | <1 | 13 h 40 min |
| September | 85°F | 60°F | 72.2°F | 3.17 | 0.0 | 6 | 9 | <1 | 12 h 30 min |
| October | 73°F | 47°F | 59.9°F | 3.61 | 0.0 | 7 | 1 | 2 | 11 h 20 min |
| November | 60°F | 34°F | 47.2°F | 1.92 | 0.1 | 5 | <1 | 12 | 10 h 10 min |
| December | 49°F | 26°F | 37.1°F | 1.68 | 2.6 | 5 | <1 | 23 | 9 h 40 min |
| Year (annual) | 71°F | 46°F | 58.3°F | 38.82 | 7.9 | 82 | 72 | 97 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 8°C | −5°C | 1.4°C | 32 mm | 5 cm |
| February | 11°C | −4°C | 3.7°C | 36 mm | 4 cm |
| March | 16°C | 1°C | 8.8°C | 72 mm | 4 cm |
| April | 22°C | 6°C | 14.0°C | 100 mm | 0 cm |
| May | 26°C | 13°C | 19.5°C | 137 mm | 0 cm |
| June | 31°C | 18°C | 24.9°C | 131 mm | 0 cm |
| July | 34°C | 21°C | 27.5°C | 111 mm | 0 cm |
| August | 34°C | 20°C | 26.8°C | 105 mm | 0 cm |
| September | 29°C | 15°C | 22.3°C | 81 mm | 0 cm |
| October | 23°C | 8°C | 15.5°C | 92 mm | 0 cm |
| November | 16°C | 1°C | 8.4°C | 49 mm | 0 cm |
| December | 9°C | −4°C | 2.8°C | 43 mm | 7 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00340818; 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 Blackwell?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, September has the fewest days with rain (6).
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 USC00340818.
When is the last frost in Blackwell?
In Blackwell, the last spring frost (32°F) comes after April 12 in half of years and after April 28 in one year in ten; the first autumn frost comes before October 29 in half of years and before October 16 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 121 year in 10 after April 28; 9 in 10 after March 26
- First autumn frost, half of years before
- October 291 year in 10 before October 16; 9 in 10 before November 11
NOAA puts the median frost-free season at 199 days, and the season without a hard freeze (28°F) at 218 days.
A hard freeze (28°F) comes after April 1 in half of springs and before November 6 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Blackwell in zone 7a in ZIP code 74631, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Blackwell's NOAA station is in zone 7a: the coldest night of a typical year reaches 4°F (25 complete years).
Frost dates for every NOAA station in Oklahoma · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00340818; 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 Blackwell?
In a normal year in Blackwell, 72 days a year reach 90°F (15 of them 100°F or more), 97 nights fall to 32°F or colder and 82 days bring measurable precipitation.
- Days at 90°F or more
- 72a normal year
- Days at 100°F or more
- 15a normal year
- Nights at 32°F or colder
- 97a normal year
- Days that stay below freezing
- 12high of 32°F or less
- Days with 0.01 inch of precipitation
- 82a normal year
- Days with 1 inch of snow or more
- 3a normal year
The highest temperature in this station's record (since 1954) is 114°F, on July 29, 1986; the lowest is −20°F, on February 11, 2011.
The wettest calendar year on that record is 1961, with 54.97 in; the snowiest season is 2002–03, with 28.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00340818; records: ACIS (NOAA Regional Climate Centers), station USC00340818. Records use complete months only; a month missing more than three days is left out.
How sunny is Blackwell?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Blackwell, 4.7 kWh per square metre a day. July is the sunniest month (87%) and February the cloudiest (74%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 77% | 2.7 |
| February | 74% | 3.4 |
| March | 74% | 4.4 |
| April | 76% | 5.5 |
| May | 77% | 6.1 |
| June | 86% | 7.0 |
| July | 87% | 6.9 |
| August | 86% | 6.1 |
| September | 84% | 5.1 |
| October | 80% | 3.9 |
| November | 80% | 2.9 |
| December | 74% | 2.3 |
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 Blackwell need?
A normal year in Blackwell brings 4,183 heating degree days, 22% fewer than the median U.S. place (5,373), and 1,793 cooling degree days, 98% more than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,710 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 944 | 0 |
| February | 737 | 0 |
| March | 537 | 4 |
| April | 261 | 26 |
| May | 71 | 134 |
| June | 3 | 355 |
| July | 0 | 513 |
| August | 0 | 471 |
| September | 24 | 240 |
| October | 205 | 47 |
| November | 536 | 2 |
| December | 865 | 0 |
| Year (annual) | 4,183 | 1,793 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00340818. 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 Blackwell been warmer than normal lately?
Over 39 complete years from 1955 to 2018, the station's annual mean temperature rose at a fitted 2.5°F per century (+0.14°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Blackwell's climate compare?
Blackwell is warmer than 15 of the other 133 places with their own NOAA record in Oklahoma, and wetter than 56. Across the 7,247 U.S. stations with normals, its annual mean of 58.3°F is warmer than 70%.
In the Köppen classification computed from these normals, Blackwell is Cfa: temperate, 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 Blackwell share this climate record?
7 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.
- Tonkawa, OK2,988 people · 8 mi S
- South Haven, KS325 people · 19 mi N
- Tonkawa Tribal Housing, OK323 people · 8 mi S
- Braman, OK164 people · 10 mi N
- Nardin, OK139 people · 9 mi W
- Hunnewell, KS43 people · 17 mi NW
- Peckham, OK37 people · 9 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.
What do Blackwell's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Blackwell. This page uses Blackwell (1 mi SSW); the other differs by site and elevation:
| Station | From the center | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Blackwell 4 mi SSE Mesonet USC00340810 | 4 mi SE | 997 ft | 58.5°F | 23°F | 93°F | – | – | April 8 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Blackwell's climate
What is the coldest month in Blackwell?
January, with a normal high of 47°F and a normal low of 22°F. The warmest is July (94°F by day, 69°F at night).
Does it snow in Blackwell?
Yes: 8 inches in a normal year, falling on 4 days with 0.1 inch or more, the most in December (2.6 inches).
What is the rainiest month in Blackwell?
May, with 5.39 in of precipitation in a normal year; the driest is January with 1.25 in.
What plant hardiness zone is Blackwell in?
The USDA's 2023 map puts Blackwell in zone 7a in ZIP code 74631, the nearest ZIP area. By the same method at Blackwell's NOAA station, the coldest night of a typical year reaches 4°F (25 years, 1991-2020): zone 7a.
How late can frost come in Blackwell?
In half of years the last 32°F night comes after April 12; in one year in ten it comes after April 28. Waiting until April 28 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oklahoma climateThe statewide normals and every place in the state
- Ponca City, OK11 miles from this station, 59.4°F a year
- Newkirk, OK19 miles from this station, 57.2°F a year
- Billings, OK20 miles from this station, 58.6°F a year
- Medford, OK25 miles from this station, 58.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made