Mammoth Spring, Arkansas climate: Normal weather by month, frost dates and records
Mammoth Spring's normal year runs from 23°F January nights to 90°F July afternoons, with 48.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 14.1°C, January lows of −5°C, July highs of 32°C, 1,238 mm of precipitation a year.
- NOAA stationMammoth Spring
- Station IDUSC00034572
- Location36.49°N 91.53°W
- Elevation502 ft (153 m)
- Population948
On October 22, the normal high in Mammoth Spring is 70°F and the normal low 42°F, and the chance of measurable rain or snow is 26%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Mammoth Spring.
- Jan 47° 23°
- Feb 52° 27°
- Mar 61° 35°
- Apr 71° 44°
- May 78° 54°
- Jun 86° 63°
- Jul 90° 66°
- Aug 90° 65°
- Sep 82° 57°
- Oct 72° 44°
- Nov 60° 34°
- Dec 50° 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 Mammoth Spring each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 23°F. The most precipitation falls in May (5.31 in), the least in June (3.34 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 47°F | 23°F | 34.8°F | 3.56 | 7 | <1 | 25 | 10 h |
| February | 52°F | 27°F | 39.0°F | 3.48 | 7 | <1 | 20 | 10 h 50 min |
| March | 61°F | 35°F | 48.0°F | 4.62 | 9 | <1 | 13 | 11 h 50 min |
| April | 71°F | 44°F | 57.4°F | 5.21 | 9 | <1 | 4 | 13 h 10 min |
| May | 78°F | 54°F | 66.1°F | 5.31 | 10 | 1 | <1 | 14 h |
| June | 86°F | 63°F | 74.4°F | 3.34 | 8 | 9 | <1 | 14 h 40 min |
| July | 90°F | 66°F | 78.4°F | 3.95 | 8 | 18 | <1 | 14 h 30 min |
| August | 90°F | 65°F | 77.2°F | 3.49 | 7 | 15 | <1 | 13 h 40 min |
| September | 82°F | 57°F | 69.5°F | 3.64 | 6 | 5 | <1 | 12 h 30 min |
| October | 72°F | 44°F | 58.2°F | 3.77 | 8 | <1 | 3 | 11 h 20 min |
| November | 60°F | 34°F | 47.1°F | 4.59 | 8 | <1 | 14 | 10 h 20 min |
| December | 50°F | 27°F | 38.2°F | 3.79 | 8 | <1 | 22 | 9 h 40 min |
| Year (annual) | 70°F | 45°F | 57.4°F | 48.75 | 94 | 49 | 103 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 8°C | −5°C | 1.6°C | 90 mm |
| February | 11°C | −3°C | 3.9°C | 88 mm |
| March | 16°C | 2°C | 8.9°C | 117 mm |
| April | 22°C | 7°C | 14.1°C | 132 mm |
| May | 26°C | 12°C | 18.9°C | 135 mm |
| June | 30°C | 17°C | 23.6°C | 85 mm |
| July | 32°C | 19°C | 25.8°C | 100 mm |
| August | 32°C | 18°C | 25.1°C | 89 mm |
| September | 28°C | 14°C | 20.8°C | 92 mm |
| October | 22°C | 7°C | 14.6°C | 96 mm |
| November | 16°C | 1°C | 8.4°C | 117 mm |
| December | 10°C | −3°C | 3.4°C | 96 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Hardy (15 miles away), gets 7 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00034572; 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 Mammoth Spring?
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 USC00034572.
When is the last frost in Mammoth Spring?
In Mammoth Spring, the last spring frost (32°F) comes after April 12 in half of years and after April 27 in one year in ten; the first autumn frost comes before October 24 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 121 year in 10 after April 27; 9 in 10 after March 27
- First autumn frost, half of years before
- October 241 year in 10 before October 11; 9 in 10 before November 5
NOAA puts the median frost-free season at 194 days, and the season without a hard freeze (28°F) at 217 days.
A hard freeze (28°F) comes after April 1 in half of springs and before November 3 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Mammoth Spring in zone 7a in ZIP code 72554, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Mammoth Spring's NOAA station is in zone 7a: the coldest night of a typical year reaches 4°F (28 complete years).
Frost dates for every NOAA station in Arkansas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00034572; 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 Mammoth Spring?
In a normal year in Mammoth Spring, 49 days a year reach 90°F (2 of them 100°F or more), 103 nights fall to 32°F or colder and 94 days bring measurable precipitation.
- Days at 90°F or more
- 49a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 103a normal year
- Days that stay below freezing
- 8high of 32°F or less
- Days with 0.01 inch of precipitation
- 94a normal year
The highest temperature in this station's record (since 1904) is 110°F, on July 16, 1980; the lowest is −24°F, on February 2, 1951.
The wettest calendar year on that record is 2015, with 70.68 in; the snowiest season is 1976–77, with 23.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00034572; records: ACIS (NOAA Regional Climate Centers), station USC00034572. Records use complete months only; a month missing more than three days is left out.
How sunny is Mammoth Spring?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Mammoth Spring, 4.4 kWh per square metre a day. July is the sunniest month (82%) and February the cloudiest (67%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 2.4 |
| February | 67% | 3.0 |
| March | 70% | 4.1 |
| April | 73% | 5.2 |
| May | 74% | 5.8 |
| June | 82% | 6.7 |
| July | 82% | 6.4 |
| August | 82% | 5.7 |
| September | 81% | 4.9 |
| October | 76% | 3.6 |
| November | 74% | 2.7 |
| December | 68% | 2.1 |
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 Mammoth Spring need?
A normal year in Mammoth Spring brings 4,180 heating degree days, 22% fewer than the median U.S. place (5,373), and 1,427 cooling degree days, 57% 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 4,294 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 936 | 0 |
| February | 728 | 0 |
| March | 529 | 4 |
| April | 254 | 25 |
| May | 77 | 111 |
| June | 5 | 288 |
| July | 0 | 414 |
| August | 1 | 379 |
| September | 37 | 173 |
| October | 239 | 30 |
| November | 541 | 3 |
| December | 832 | 0 |
| Year (annual) | 4,180 | 1,427 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00034572. 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 Mammoth Spring been warmer than normal lately?
2025 averaged 58.7°F, 1.3°F above the 1991-2020 normal of 57.4°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 57.9°F | +0.5°F | 51.30 |
| 2022 | 57.0°F | −0.4°F | 50.87 |
| 2023 | 59.0°F | +1.6°F | 55.97 |
| 2024 | 59.3°F | +1.9°F | 64.64 |
| 2025 | 58.7°F | +1.3°F | 52.77 |
Over 85 complete years from 1908 to 2025, the station's annual mean temperature rose at a fitted 0.2°F per century (+0.01°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00034572; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Mammoth Spring's climate compare?
Mammoth Spring is warmer than 7 of the other 85 places with their own NOAA record in Arkansas, and wetter than 15. Across the 7,247 U.S. stations with normals, its annual mean of 57.4°F is warmer than 68%.
In the Köppen classification computed from these normals, Mammoth Spring 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 Mammoth Spring share this climate record?
3 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.
- Thayer, MO1,904 people · 2 mi N
- Koshkonong, MO196 people · 9 mi NW
- Brandsville, MO128 people · 14 mi NW
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 Mammoth Spring's climate
What is the coldest month in Mammoth Spring?
January, with a normal high of 47°F and a normal low of 23°F. The warmest is July (90°F by day, 66°F at night).
Does it snow in Mammoth Spring?
Yes. NOAA publishes no 1991-2020 snowfall normal for Mammoth Spring's NOAA station; the nearest record that keeps one, Hardy (15 miles away), records 7 inches of snow in a normal year.
What is the rainiest month in Mammoth Spring?
May, with 5.31 in of precipitation in a normal year; the driest is June with 3.34 in.
What plant hardiness zone is Mammoth Spring in?
The USDA's 2023 map puts Mammoth Spring in zone 7a in ZIP code 72554, the nearest ZIP area. By the same method at Mammoth Spring's NOAA station, the coldest night of a typical year reaches 4°F (28 years, 1991-2020): zone 7a.
How late can frost come in Mammoth Spring?
In half of years the last 32°F night comes after April 12; in one year in ten it comes after April 27. Waiting until April 27 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Arkansas climateThe statewide normals and every place in the state
- Hardy, AR16 miles from this station, 58.4°F a year
- Alton, MO16 miles from this station, 55.7°F a year
- Salem, AR18 miles from this station, 57.5°F a year
- Evening Shade, AR29 miles from this station, 57.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made