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Template:Sioux City, Iowa weatherbox

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Climate data for Sioux City, Iowa (Sioux Gateway Airport), 1991–2020 normals, extremes 1889–present
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 71
(22)
75
(24)
91
(33)
98
(37)
106
(41)
108
(42)
111
(44)
108
(42)
103
(39)
96
(36)
82
(28)
71
(22)
111
(44)
Mean maximum °F (°C) 52.2
(11.2)
57.9
(14.4)
74.7
(23.7)
85.7
(29.8)
92.5
(33.6)
95.4
(35.2)
95.3
(35.2)
94.1
(34.5)
91.6
(33.1)
85.3
(29.6)
70.3
(21.3)
54.4
(12.4)
98.3
(36.8)
Mean daily maximum °F (°C) 29.5
(−1.4)
34.2
(1.2)
47.6
(8.7)
61.1
(16.2)
72.3
(22.4)
81.9
(27.7)
85.0
(29.4)
82.6
(28.1)
76.6
(24.8)
62.8
(17.1)
46.8
(8.2)
33.4
(0.8)
59.5
(15.3)
Daily mean °F (°C) 20.0
(−6.7)
24.5
(−4.2)
36.7
(2.6)
48.9
(9.4)
60.5
(15.8)
70.7
(21.5)
74.2
(23.4)
71.7
(22.1)
63.9
(17.7)
50.3
(10.2)
35.9
(2.2)
24.1
(−4.4)
48.4
(9.1)
Mean daily minimum °F (°C) 10.4
(−12.0)
14.8
(−9.6)
25.9
(−3.4)
36.7
(2.6)
48.7
(9.3)
59.4
(15.2)
63.4
(17.4)
60.8
(16.0)
51.2
(10.7)
37.9
(3.3)
25.0
(−3.9)
14.8
(−9.6)
37.4
(3.0)
Mean minimum °F (°C) −12.1
(−24.5)
−6.8
(−21.6)
4.1
(−15.5)
20.0
(−6.7)
33.4
(0.8)
46.3
(7.9)
51.2
(10.7)
49.2
(9.6)
34.3
(1.3)
20.2
(−6.6)
7.0
(−13.9)
−6.9
(−21.6)
−16.1
(−26.7)
Record low °F (°C) −35
(−37)
−31
(−35)
−22
(−30)
−2
(−19)
23
(−5)
38
(3)
41
(5)
37
(3)
24
(−4)
5
(−15)
−9
(−23)
−28
(−33)
−35
(−37)
Average precipitation inches (mm) 0.69
(18)
0.86
(22)
1.76
(45)
3.15
(80)
3.87
(98)
4.35
(110)
3.35
(85)
3.94
(100)
2.84
(72)
2.20
(56)
1.27
(32)
0.99
(25)
29.27
(743)
Average snowfall inches (cm) 7.7
(20)
8.7
(22)
5.7
(14)
2.3
(5.8)
0.0
(0.0)
0.0
(0.0)
0.0
(0.0)
0.0
(0.0)
0.0
(0.0)
0.8
(2.0)
3.2
(8.1)
7.6
(19)
36.0
(91)
Average precipitation days (≥ 0.01 in) 6.8 6.5 8.1 10.0 12.0 11.7 9.0 9.8 8.0 7.6 5.9 6.8 102.2
Average snowy days (≥ 0.1 in) 5.9 5.7 3.4 1.4 0.0 0.0 0.0 0.0 0.0 0.5 2.5 5.4 24.8
Average relative humidity (%) 72.2 72.4 69.7 61.6 62.3 65.5 69.2 72.0 70.8 66.2 72.3 75.9 69.2
Mean monthly sunshine hours 171.1 165.5 211.9 232.3 271.8 310.2 330.9 292.9 235.5 209.3 146.4 138.3 2,716.1
Percent possible sunshine 58 56 57 58 60 68 71 68 63 61 50 49 61
Source: NOAA (relative humidity and sun 1961–1990)[1][2][3]
  1. ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved June 27, 2021.
  2. ^ "Station: Sioux City Gateway AP, IA". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. Retrieved June 27, 2021.
  3. ^ "WMO Climate Normals for SIOUX CITY/MUNICIPAL, IA 1961–1990". National Oceanic and Atmospheric Administration. Retrieved June 27, 2021.