Template:St. Louis weatherbox
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| Climate data for St. Louis, Missouri (Lambert–St. Louis Int'l), 1981−2010 normals,[lower-alpha 1] extremes 1874−present[lower-alpha 2] | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 77 (25) |
85 (29) |
92 (33) |
93 (34) |
98 (37) |
108 (42) |
115 (46) |
110 (43) |
104 (40) |
94 (34) |
86 (30) |
76 (24) |
115 (46) |
| Mean maximum °F (°C) | 64.1 (17.8) |
69.8 (21.0) |
80.2 (26.8) |
86.7 (30.4) |
89.4 (31.9) |
94.8 (34.9) |
98.5 (36.9) |
99.3 (37.4) |
92.7 (33.7) |
85.7 (29.8) |
75.6 (24.2) |
65.0 (18.3) |
100.4 (38.0) |
| Average high °F (°C) | 39.9 (4.4) |
45.0 (7.2) |
55.9 (13.3) |
67.4 (19.7) |
76.3 (24.6) |
85.1 (29.5) |
89.1 (31.7) |
87.9 (31.1) |
80.2 (26.8) |
68.5 (20.3) |
55.5 (13.1) |
42.5 (5.8) |
66.2 (19.0) |
| Daily mean °F (°C) | 31.8 (−0.1) |
36.3 (2.4) |
46.3 (7.9) |
57.3 (14.1) |
66.8 (19.3) |
75.9 (24.4) |
80.0 (26.7) |
78.6 (25.9) |
70.4 (21.3) |
58.7 (14.8) |
46.8 (8.2) |
34.7 (1.5) |
57.0 (13.9) |
| Average low °F (°C) | 23.7 (−4.6) |
27.6 (−2.4) |
36.6 (2.6) |
47.2 (8.4) |
57.2 (14.0) |
66.8 (19.3) |
71.0 (21.7) |
69.4 (20.8) |
60.6 (15.9) |
49.0 (9.4) |
38.1 (3.4) |
26.9 (−2.8) |
47.9 (8.8) |
| Mean minimum °F (°C) | 4.2 (−15.4) |
8.0 (−13.3) |
18.4 (−7.6) |
31.5 (−0.3) |
43.2 (6.2) |
54.3 (12.4) |
60.3 (15.7) |
59.0 (15.0) |
44.8 (7.1) |
33.5 (0.8) |
22.4 (−5.3) |
7.5 (−13.6) |
−1.8 (−18.8) |
| Record low °F (°C) | −22 (−30) |
−18 (−28) |
−5 (−21) |
20 (−7) |
31 (−1) |
43 (6) |
51 (11) |
47 (8) |
32 (0) |
21 (−6) |
1 (−17) |
−16 (−27) |
−22 (−30) |
| Average precipitation inches (mm) | 2.40 (61) |
2.24 (57) |
3.32 (84) |
3.69 (94) |
4.72 (120) |
4.28 (109) |
4.11 (104) |
2.99 (76) |
3.13 (80) |
3.33 (85) |
3.91 (99) |
2.84 (72) |
40.96 (1,040) |
| Average snowfall inches (cm) | 5.6 (14) |
4.3 (11) |
2.3 (5.8) |
0.4 (1.0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0.7 (1.8) |
4.4 (11) |
17.7 (45) |
| Average precipitation days (≥ 0.01 in) | 8.9 | 8.0 | 10.3 | 11.3 | 11.9 | 10.0 | 8.9 | 8.2 | 7.4 | 8.7 | 9.6 | 9.4 | 112.6 |
| Average snowy days (≥ 0.1 in) | 4.7 | 3.4 | 1.7 | 0.3 | 0 | 0 | 0 | 0 | 0 | 0 | 0.7 | 3.7 | 14.5 |
| Average relative humidity (%) | 73.0 | 72.0 | 68.3 | 63.5 | 66.5 | 67.1 | 68.0 | 70.0 | 71.6 | 68.7 | 72.2 | 75.8 | 69.7 |
| Mean monthly sunshine hours | 161.2 | 158.3 | 198.3 | 223.5 | 266.5 | 291.9 | 308.9 | 269.8 | 236.1 | 208.4 | 140.9 | 129.9 | 2,593.7 |
| Percent possible sunshine | 53 | 53 | 53 | 56 | 60 | 66 | 68 | 64 | 63 | 60 | 47 | 44 | 58 |
| Source: NOAA (relative humidity and sun 1961−1990)[2][3][4] | |||||||||||||
- ↑ Mean monthly maxima and minima (i.e. the highest and lowest temperature readings during an entire month or year) calculated based on data at said location from 1981 to 2010.
- ↑ Official records for St. Louis were kept at the Weather Bureau Office from January 1874 to December 1892, Eads Bridge from January 1893 to December 1929, and at Lambert–St. Louis Int'l since January 1930.[1]
- ↑ ThreadEx
- ↑ "Station Name: MO ST LOUIS LAMBERT INTL AP". National Oceanic and Atmospheric Administration. Retrieved 2018-01-30.
- ↑ "NowData - NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved 2016-09-07.
- ↑ "WMO Climate Normals for ST. LOUIS/LAMBERT, MO 1961–1990". National Oceanic and Atmospheric Administration. Retrieved 2014-03-11.
