Marietta, Oklahoma climate: Normal weather by month, frost dates and records
Marietta's normal year runs from 28°F January nights to 94°F July afternoons, with 39.8 inches of precipitation and 4 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 16.4°C, January lows of −2°C, July highs of 34°C, 1,011 mm of precipitation a year.
- NOAA stationMarietta (5 mi SW)
- Station IDUSC00345563
- Location33.88°N 97.16°W
- Elevation802 ft (244 m)
- From the center5 miles
- Population2,891
On October 23, the normal high in Marietta is 73°F and the normal low 47°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 Marietta.
- Jan 53° 28°
- Feb 57° 32°
- Mar 65° 40°
- Apr 73° 48°
- May 80° 58°
- Jun 88° 67°
- Jul 94° 70°
- Aug 94° 69°
- Sep 86° 61°
- Oct 76° 50°
- Nov 64° 39°
- Dec 55° 30°
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 Marietta each month?
July is the warmest month, with normal highs of 94°F; January the coldest, with normal lows of 28°F. The most precipitation falls in May (5.55 in), the least in January (1.99 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 53°F | 28°F | 40.3°F | 1.99 | 1.6 | 5 | <1 | 20 | 10 h 10 min |
| February | 57°F | 32°F | 44.6°F | 2.23 | 0.9 | 5 | <1 | 14 | 11 h |
| March | 65°F | 40°F | 52.5°F | 3.38 | 0.3 | 6 | <1 | 7 | 11 h 50 min |
| April | 73°F | 48°F | 60.8°F | 3.75 | 0.0 | 7 | <1 | 1 | 13 h |
| May | 80°F | 58°F | 69.2°F | 5.55 | 0.0 | 9 | 3 | <1 | 13 h 50 min |
| June | 88°F | 67°F | 77.5°F | 4.19 | 0.0 | 7 | 14 | <1 | 14 h 20 min |
| July | 94°F | 70°F | 81.9°F | 2.84 | 0.0 | 6 | 25 | <1 | 14 h 10 min |
| August | 94°F | 69°F | 81.5°F | 2.75 | 0.0 | 6 | 24 | <1 | 13 h 30 min |
| September | 86°F | 61°F | 73.8°F | 3.83 | 0.0 | 6 | 11 | <1 | 12 h 30 min |
| October | 76°F | 50°F | 62.6°F | 4.07 | 0.0 | 6 | 1 | 1 | 11 h 20 min |
| November | 64°F | 39°F | 51.3°F | 2.57 | 0.0 | 6 | <1 | 8 | 10 h 30 min |
| December | 55°F | 30°F | 42.5°F | 2.66 | 1.0 | 5 | <1 | 18 | 9 h 50 min |
| Year (annual) | 74°F | 49°F | 61.6°F | 39.81 | 3.8 | 73 | 78 | 70 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 12°C | −2°C | 4.6°C | 51 mm | 4 cm |
| February | 14°C | 0°C | 7.0°C | 57 mm | 2 cm |
| March | 19°C | 4°C | 11.4°C | 86 mm | 1 cm |
| April | 23°C | 9°C | 16.0°C | 95 mm | 0 cm |
| May | 27°C | 15°C | 20.7°C | 141 mm | 0 cm |
| June | 31°C | 19°C | 25.3°C | 106 mm | 0 cm |
| July | 34°C | 21°C | 27.7°C | 72 mm | 0 cm |
| August | 35°C | 21°C | 27.5°C | 70 mm | 0 cm |
| September | 30°C | 16°C | 23.2°C | 97 mm | 0 cm |
| October | 24°C | 10°C | 17.0°C | 103 mm | 0 cm |
| November | 18°C | 4°C | 10.7°C | 65 mm | 0 cm |
| December | 13°C | −1°C | 5.8°C | 68 mm | 3 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00345563; 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 Marietta?
Normal highs sit between 65°F and 85°F in March, April, May and October. Of those, October 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 USC00345563.
When is the last frost in Marietta?
In Marietta, the last spring frost (32°F) comes after April 6 in half of years and after April 24 in one year in ten; the first autumn frost comes before November 2 in half of years and before October 18 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 61 year in 10 after April 24; 9 in 10 after March 16
- First autumn frost, half of years before
- November 21 year in 10 before October 18; 9 in 10 before November 16
NOAA puts the median frost-free season at 211 days, and the season without a hard freeze (28°F) at 232 days.
A hard freeze (28°F) comes after March 23 in half of springs and before November 9 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Marietta in zone 8a in ZIP code 73448, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Marietta's NOAA station is in zone 8a: the coldest night of a typical year reaches 10°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 USC00345563; 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 Marietta?
In a normal year in Marietta, 78 days a year reach 90°F (14 of them 100°F or more), 70 nights fall to 32°F or colder and 73 days bring measurable precipitation.
- Days at 90°F or more
- 78a normal year
- Days at 100°F or more
- 14a normal year
- Nights at 32°F or colder
- 70a normal year
- Days that stay below freezing
- 3high of 32°F or less
- Days with 0.01 inch of precipitation
- 73a normal year
- Days with 1 inch of snow or more
- 1a normal year
The highest temperature in this station's record (since 1940) is 112°F, on August 16, 1956; the lowest is −8°F, on December 23, 1989.
The wettest calendar year on that record is 1990, with 59.27 in; the snowiest season is 1977–78, with 20.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00345563; records: ACIS (NOAA Regional Climate Centers), station USC00345563. Records use complete months only; a month missing more than three days is left out.
How sunny is Marietta?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Marietta, 4.8 kWh per square metre a day. July is the sunniest month (88%) and February the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.9 |
| February | 72% | 3.5 |
| March | 74% | 4.6 |
| April | 77% | 5.6 |
| May | 77% | 6.0 |
| June | 85% | 6.9 |
| July | 88% | 6.9 |
| August | 87% | 6.3 |
| September | 84% | 5.2 |
| October | 81% | 4.1 |
| November | 79% | 3.1 |
| December | 75% | 2.6 |
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 Marietta need?
A normal year in Marietta brings 3,233 heating degree days, 40% fewer than the median U.S. place (5,373), and 2,007 cooling degree days, 2.2 times 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 5,277 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 764 | 0 |
| February | 574 | 2 |
| March | 398 | 10 |
| April | 174 | 46 |
| May | 40 | 172 |
| June | 1 | 377 |
| July | 0 | 524 |
| August | 0 | 513 |
| September | 15 | 279 |
| October | 147 | 75 |
| November | 420 | 9 |
| December | 700 | 1 |
| Year (annual) | 3,233 | 2,007 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00345563. 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 Marietta been warmer than normal lately?
Over 59 complete years from 1943 to 2017, the station's annual mean temperature rose at a fitted 0.8°F per century (+0.04°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 Marietta's climate compare?
Marietta is warmer than 103 of the other 133 places with their own NOAA record in Oklahoma, and wetter than 59. Across the 7,247 U.S. stations with normals, its annual mean of 61.6°F is warmer than 79%.
In the Köppen classification computed from these normals, Marietta 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 Marietta share this climate record?
2 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.
- Lindsay, TX1,264 people · 16 mi S
- Greenville, OK142 people · 9 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 Marietta's climate
What is the coldest month in Marietta?
January, with a normal high of 53°F and a normal low of 28°F. The warmest is July (94°F by day, 70°F at night).
Does it snow in Marietta?
Yes: 4 inches in a normal year, falling on 1 days with 0.1 inch or more, the most in January (1.6 inches).
What is the rainiest month in Marietta?
May, with 5.55 in of precipitation in a normal year; the driest is January with 1.99 in.
What plant hardiness zone is Marietta in?
The USDA's 2023 map puts Marietta in zone 8a in ZIP code 73448, the nearest ZIP area. By the same method at Marietta's NOAA station, the coldest night of a typical year reaches 10°F (25 years, 1991-2020): zone 8a.
How late can frost come in Marietta?
In half of years the last 32°F night comes after April 6; in one year in ten it comes after April 24. Waiting until April 24 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oklahoma climateThe statewide normals and every place in the state
- Burneyville, OK6 miles from this station, 63.1°F a year
- Gainesville, TX17 miles from this station, 63.2°F a year
- Ardmore, OK21 miles from this station, 64.5°F a year
- Madill, OK27 miles from this station, 62.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made