Waterloo, Iowa
Climate

Waterloo, Iowa

Section Title: Climate
Table Section Text: None

Climate data for Waterloo Regional Airport, Iowa (1981–2010 normals, extremes 1895–present)

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year

Record high °F (°C)	65 (18)	71 (22)	87 (31)	100 (38)	108 (42)	107 (42)	112 (44)	110 (43)	102 (39)	95 (35)	83 (28)	67 (19)	112 (44)

Mean maximum °F (°C)	46.9 (8.3)	51.8 (11.0)	71.7 (22.1)	83.2 (28.4)	88.0 (31.1)	93.3 (34.1)	94.9 (34.9)	93.0 (33.9)	89.8 (32.1)	82.5 (28.1)	66.5 (19.2)	48.8 (9.3)	96.6 (35.9)

Average high °F (°C)	27.4 (−2.6)	32.2 (0.1)	45.6 (7.6)	60.6 (15.9)	72.0 (22.2)	81.2 (27.3)	84.4 (29.1)	82.2 (27.9)	75.3 (24.1)	61.9 (16.6)	45.9 (7.7)	30.8 (−0.7)	58.4 (14.7)

Average low °F (°C)	9.5 (−12.5)	14.6 (−9.7)	26.0 (−3.3)	37.2 (2.9)	49.0 (9.4)	58.9 (14.9)	62.8 (17.1)	60.2 (15.7)	50.7 (10.4)	38.7 (3.7)	26.8 (−2.9)	13.5 (−10.3)	37.4 (3.0)

Mean minimum °F (°C)	−14.9 (−26.1)	−10.7 (−23.7)	4.9 (−15.1)	19.6 (−6.9)	33.4 (0.8)	44.9 (7.2)	50.7 (10.4)	46.9 (8.3)	32.9 (0.5)	21.5 (−5.8)	8.7 (−12.9)	−10.4 (−23.6)	−19.6 (−28.7)

Record low °F (°C)	−34 (−37)	−31 (−35)	−34 (−37)	−4 (−20)	22 (−6)	33 (1)	42 (6)	33 (1)	19 (−7)	0 (−18)	−17 (−27)	−29 (−34)	−34 (−37)

Average precipitation inches (mm)	0.83 (21)	0.99 (25)	2.06 (52)	3.71 (94)	4.53 (115)	4.98 (126)	4.91 (125)	4.27 (108)	2.63 (67)	2.48 (63)	2.01 (51)	1.20 (30)	34.60 (879)

Average snowfall inches (cm)	8.2 (21)	7.4 (19)	4.6 (12)	1.8 (4.6)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	0.3 (0.76)	3.1 (7.9)	9.9 (25)	35.3 (90)

Average precipitation days (≥ 0.01 in)	7.2	7.4	9.7	10.9	12.4	11.5	9.7	9.1	8.5	8.5	8.6	8.4	111.9

Average snowy days (≥ 0.1 in)	6.5	5.6	3.4	1.1	0	0	0	0	0	0.2	2.9	6.9	26.6

Average relative humidity (%)	73.0	73.8	72.7	66.4	65.7	67.7	71.9	73.7	73.7	69.9	74.8	77.2	71.8

Source: NOAA (relative humidity 1961–90),

Sentence(s)

Temperature records range from −34 °F (−37 °C) in March and January, and up to 112 °F (44 °C) in July.

final_sentence: Temperature records range from −34 °F (−37 °C) in March and January, and up to 112 °F (44 °C) in July.