Geography of St. Louis
Climate

Geography of St. Louis

Section Title: Climate
Table Section Text: None

Climate data for St. Louis, Missouri (Lambert–St. Louis Int'l), 1981−2010 normals, extremes 1874−present

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)	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)

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)

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)	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)	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 (6)	0.4 (1)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	0.7 (2)	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)

Sentence(s)

The average annual temperature recorded in St. Louis is 13.9 °C and average precipitation is 1,040 mm.

final_sentence: The average annual temperature recorded in St. Louis is 13.9 °C and average precipitation is 1,040 mm.