Climate of Little Rock, Arkansas

All of Arkansas falls within the humid subtropical Köppen climate classification.

Little Rock has a humid subtropical climate (Köppen Cfa), with hot, usually humid summers, but subject to drought, primarily in late summer. According to the Trewartha climate classification system, Little Rock is subtropical because nine of its months exceed 50 °F (10 °C) in average temperature. Summers are usually hot, occasionally extremely hot; winters are short and cool, but with marked temperature variations, as the area is subject to alternating incursions of warm, moist air from the Gulf of Mexico (possibly producing daily high temperatures in the 70s °F.) and cold, dry air from Canada (possibly producing daily high temperatures below freezing, 32 °F, even in the 20s °F.).

The Little Rock area has nearly 50 inches (1,300 mm) of precipitation per year, on average. Little Rock experiences a prolonged spring wet season, with heavy rainfall a distinct possibility from March to May, and a secondary wet season peaking in November and December. On average, August is the driest month, and July through September is the driest period of the year. Little Rock averages more rain than the national average, but also averages more sunny days than the national average.

Thunderstorms can occur any month of the year, but are especially frequent and severe in spring, when torrential rainfall, damaging thunderstorm winds, hail, and tornadoes are all significant threats; a secondary severe weather season peaks in November. Snow, sleet and freezing rain can occur during the winter season, when cold Canadian air at ground level is overrun by warm, moist air from the Gulf of Mexico. Unless otherwise indicated, all normal data presented below are based on data at Bill and Hillary Clinton National Airport the official Little Rock climatology station, from the 1981−2010 normals period.

General climatology

With an annual mean minimum temperature of 13.6 °F (−10 °C), Little Rock is in USDA plant hardiness zone 8a, allowing the cultivation of some subtropical species such as Crape Myrtle and some cold hardy palms.

Temperature

Climate data for Little Rock (Clinton National Airport), 1991−2020 normals,[a] extremes 1879−present[b]
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 83
(28) 		87
(31) 		91
(33) 		95
(35) 		98
(37) 		107
(42) 		112
(44) 		114
(46) 		106
(41) 		98
(37) 		86
(30) 		81
(27) 		114
(46)
Mean maximum °F (°C) 72.0
(22.2) 		75.8
(24.3) 		82.2
(27.9) 		86.2
(30.1) 		91.3
(32.9) 		96.2
(35.7) 		100.2
(37.9) 		101.1
(38.4) 		96.2
(35.7) 		89.2
(31.8) 		79.6
(26.4) 		72.8
(22.7) 		102.4
(39.1)
Mean daily maximum °F (°C) 50.5
(10.3) 		55.2
(12.9) 		63.7
(17.6) 		72.8
(22.7) 		80.5
(26.9) 		88.2
(31.2) 		91.7
(33.2) 		91.5
(33.1) 		85.1
(29.5) 		74.2
(23.4) 		61.9
(16.6) 		52.6
(11.4) 		72.3
(22.4)
Daily mean °F (°C) 40.7
(4.8) 		44.7
(7.1) 		52.7
(11.5) 		61.4
(16.3) 		69.9
(21.1) 		78.0
(25.6) 		81.4
(27.4) 		80.8
(27.1) 		74.0
(23.3) 		62.6
(17.0) 		51.1
(10.6) 		43.0
(6.1) 		61.7
(16.5)
Mean daily minimum °F (°C) 30.9
(−0.6) 		34.2
(1.2) 		41.8
(5.4) 		50.1
(10.1) 		59.3
(15.2) 		67.7
(19.8) 		71.2
(21.8) 		70.1
(21.2) 		62.9
(17.2) 		50.9
(10.5) 		40.2
(4.6) 		33.3
(0.7) 		51.0
(10.6)
Mean minimum °F (°C) 16.4
(−8.7) 		20.5
(−6.4) 		26.6
(−3.0) 		36.9
(2.7) 		47.2
(8.4) 		59.8
(15.4) 		65.6
(18.7) 		63.8
(17.7) 		50.4
(10.2) 		37.1
(2.8) 		26.4
(−3.1) 		20.3
(−6.5) 		13.6
(−10.2)
Record low °F (°C) −8
(−22) 		−12
(−24) 		11
(−12) 		28
(−2) 		38
(3) 		46
(8) 		54
(12) 		52
(11) 		37
(3) 		27
(−3) 		10
(−12) 		−1
(−18) 		−12
(−24)
Average precipitation inches (mm) 3.50
(89) 		3.97
(101) 		4.96
(126) 		5.59
(142) 		5.08
(129) 		3.55
(90) 		3.33
(85) 		3.16
(80) 		3.01
(76) 		4.47
(114) 		4.72
(120) 		5.08
(129) 		50.42
(1,281)
Average snowfall inches (cm) 1.1
(2.8) 		1.6
(4.1) 		0.5
(1.3) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.6
(1.5) 		3.8
(9.7)
Average precipitation days (≥ 0.01 in) 9.2 9.3 10.5 9.4 10.9 8.0 8.7 7.2 6.6 8.1 8.5 9.5 105.9
Average snowy days (≥ 0.1 in) 0.5 0.9 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.3 2.2
Average relative humidity (%) 70.2 68.3 65.4 66.7 71.1 70.0 71.6 71.7 73.5 70.4 71.0 70.9 70.1
Average dew point °F (°C) 28.9
(−1.7) 		32.4
(0.2) 		40.3
(4.6) 		49.6
(9.8) 		59.2
(15.1) 		66.2
(19.0) 		70.2
(21.2) 		68.5
(20.3) 		63.1
(17.3) 		51.1
(10.6) 		41.7
(5.4) 		32.7
(0.4) 		50.3
(10.2)
Mean monthly sunshine hours 180.9 188.2 244.5 276.7 325.3 346.2 351.0 323.0 271.9 251.0 176.9 166.2 3,101.8
Percent possible sunshine 58 62 66 71 75 80 80 78 73 72 57 54 70
Average ultraviolet index 2.5 3.8 5.7 7.6 8.9 9.6 9.8 8.9 7.2 4.9 3.0 2.3 6.1
Source 1: NOAA (relative humidity and dew point 1961-1990, sun 1961−1990 at North Little Rock Airport)[1][2][3][4][5]
Source 2: UV Index Today (1995 to 2022)[6]

Other data

Meteorological Data for the Little Rock Greater Metropolitan Area
Wind speeds during the various months.
Temperature averages for each month.

See also

Notes

  1. ^ Mean monthly maxima and minima (i.e. the expected highest and lowest temperature readings at any point during the year or given month) calculated based on data at said location from 1991 to 2020.
  2. ^ Official records for Little Rock began on 1 July 1879 at the State Capitol and maintained there until 30 April 1942. The next day, and until 7 August 1942, temperature and precipitation were recorded separately at two different locations in and around Little Rock, and the official climatology station has been Adams Field since 8 August 1942. For more information, see Threadex

References

  1. ^ "NowData − NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved June 18, 2021.
  2. ^ "Station: Little Rock AP Adams FLD, AR". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991−2020). National Oceanic and Atmospheric Administration. Retrieved June 18, 2021.
  3. ^ "Climatological Averages, Statistics and Records for Little Rock, Arkansas" (PDF). National Weather Service. Retrieved June 18, 2021.
  4. ^ "Little Rock Climate Normals 1961-1990". National Oceanic and Atmospheric Administration. Retrieved August 28, 2023.
  5. ^ "WMO 1961–1990 Climate Normals for North Little Rock Airport". National Oceanic and Atmospheric Administration. Retrieved June 18, 2021.
  6. ^ "Historical UV Index Data - Little Rock, AR". UV Index Today. Retrieved April 20, 2023.

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