Template:Quad Cities weatherbox
| Climate data for Quad Cities (Quad City International Airport), 1991–2020 normals,[a] extremes 1871–present[b] | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 69 (21) |
74 (23) |
88 (31) |
93 (34) |
104 (40) |
104 (40) |
111 (44) |
106 (41) |
100 (38) |
95 (35) |
80 (27) |
75 (24) |
111 (44) |
| Mean maximum °F (°C) | 53.4 (11.9) |
57.6 (14.2) |
73.6 (23.1) |
82.7 (28.2) |
89.2 (31.8) |
94.0 (34.4) |
95.1 (35.1) |
93.8 (34.3) |
91.2 (32.9) |
84.1 (28.9) |
69.8 (21.0) |
57.6 (14.2) |
96.9 (36.1) |
| Mean daily maximum °F (°C) | 31.8 (−0.1) |
36.6 (2.6) |
49.9 (9.9) |
63.0 (17.2) |
73.9 (23.3) |
83.1 (28.4) |
86.1 (30.1) |
84.1 (28.9) |
77.9 (25.5) |
64.8 (18.2) |
49.8 (9.9) |
37.0 (2.8) |
61.5 (16.4) |
| Daily mean °F (°C) | 23.3 (−4.8) |
27.7 (−2.4) |
39.7 (4.3) |
51.4 (10.8) |
62.5 (16.9) |
72.1 (22.3) |
75.5 (24.2) |
73.4 (23.0) |
66.1 (18.9) |
53.7 (12.1) |
40.4 (4.7) |
28.9 (−1.7) |
51.2 (10.7) |
| Mean daily minimum °F (°C) | 14.8 (−9.6) |
18.8 (−7.3) |
29.6 (−1.3) |
39.9 (4.4) |
51.1 (10.6) |
61.0 (16.1) |
64.9 (18.3) |
62.7 (17.1) |
54.2 (12.3) |
42.6 (5.9) |
30.9 (−0.6) |
20.8 (−6.2) |
40.9 (4.9) |
| Mean minimum °F (°C) | −9.4 (−23.0) |
−2.3 (−19.1) |
9.6 (−12.4) |
24.7 (−4.1) |
35.2 (1.8) |
48.0 (8.9) |
54.0 (12.2) |
52.1 (11.2) |
39.1 (3.9) |
26.3 (−3.2) |
14.1 (−9.9) |
−0.2 (−17.9) |
−14.2 (−25.7) |
| Record low °F (°C) | −33 (−36) |
−28 (−33) |
−19 (−28) |
7 (−14) |
25 (−4) |
39 (4) |
46 (8) |
40 (4) |
24 (−4) |
11 (−12) |
−10 (−23) |
−24 (−31) |
−33 (−36) |
| Average precipitation inches (mm) | 1.66 (42) |
1.83 (46) |
2.62 (67) |
3.81 (97) |
4.67 (119) |
5.01 (127) |
4.23 (107) |
3.97 (101) |
3.32 (84) |
2.81 (71) |
2.30 (58) |
2.04 (52) |
38.27 (972) |
| Average snowfall inches (cm) | 10.8 (27) |
8.6 (22) |
4.4 (11) |
1.1 (2.8) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.3 (0.76) |
2.1 (5.3) |
8.8 (22) |
36.1 (92) |
| Average precipitation days (≥ 0.01 in) | 9.3 | 8.7 | 10.4 | 11.3 | 12.2 | 11.3 | 8.6 | 9.4 | 8.4 | 9.0 | 8.9 | 9.5 | 117.0 |
| Average snowy days (≥ 0.1 in) | 7.2 | 6.0 | 3.2 | 0.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 1.7 | 5.9 | 25.1 |
| Average relative humidity (%) | 69.9 | 69.8 | 68.3 | 64.3 | 64.9 | 65.8 | 70.5 | 73.3 | 72.8 | 68.1 | 71.3 | 74.0 | 69.4 |
| Average dew point °F (°C) | 11.7 (−11.3) |
16.2 (−8.8) |
27.0 (−2.8) |
37.2 (2.9) |
48.2 (9.0) |
57.9 (14.4) |
64.0 (17.8) |
62.6 (17.0) |
54.3 (12.4) |
41.5 (5.3) |
30.4 (−0.9) |
18.3 (−7.6) |
39.1 (3.9) |
| Mean monthly sunshine hours | 148.1 | 153.8 | 180.5 | 210.1 | 255.1 | 284.6 | 301.9 | 271.4 | 222.0 | 192.9 | 121.7 | 113.9 | 2,456 |
| Percent possible sunshine | 50 | 52 | 49 | 53 | 57 | 63 | 66 | 63 | 59 | 56 | 41 | 40 | 55 |
| Source: NOAA (relative humidity, dew point, and sun 1961−1990)[1][2][3] | |||||||||||||
- ^ 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.
- ^ Official precipitation records for the Quad Cities kept at the Weather Bureau Office (WBO) in Davenport, Iowa from July 1871 to December 1931, alternating between Quad City Int'l (KMLI) and the Davenport WBO from January 1932 to 17 February 1937, and remaining at KMLI since 18 February 1937. Temperature, snowfall, and snow depth records date to 1 January 1874, 1 August 1882, and 1 January 1901, respectively. For more information, see Threadex
- ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved June 25, 2021.
- ^ "Station: Moline Quad City INTL AP, IL". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. Retrieved June 25, 2021.
- ^ "WMO Climate Normals for MOLINE/QUAD CITY, IL 1961–1990". National Oceanic and Atmospheric Administration. Retrieved June 25, 2021.