Humid subtropical climate

Climate Simpson - Illinois

Annual high69ºF

Annual low48ºF

Precipitation49.28 inch

Month	HighºF	LowºF	Precipinch	Snowinch
Jan	44	27	3.62	3
Feb	49	30	3.51	3
Mar	60	38	4.37	1
Apr	70	47	4.56	0
May	78	56	5.57	0
Jun	86	64	4.07	0
Jul	89	68	3.86	0
Aug	89	66	3.29	0
Sep	83	58	3.54	0
Oct	72	48	3.89	0
Nov	59	39	4.51	0
Dec	47	30	4.49	2

JanHigh 44ºFLow 27ºFPrecip 3.62 inch
FebHigh 49ºFLow 30ºFPrecip 3.51 inch
MarHigh 60ºFLow 38ºFPrecip 4.37 inch
AprHigh 70ºFLow 47ºFPrecip 4.56 inch
MayHigh 78ºFLow 56ºFPrecip 5.57 inch
JunHigh 86ºFLow 64ºFPrecip 4.07 inch
JulHigh 89ºFLow 68ºFPrecip 3.86 inch
AugHigh 89ºFLow 66ºFPrecip 3.29 inch
SepHigh 83ºFLow 58ºFPrecip 3.54 inch
OctHigh 72ºFLow 48ºFPrecip 3.89 inch
NovHigh 59ºFLow 39ºFPrecip 4.51 inch
DecHigh 47ºFLow 30ºFPrecip 4.49 inch

Simpson Climate Graph - Illinois Climate Chart

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Climate summary

What is the average weather in Simpson, Illinois?

Simpson, Illinois, experiences a humid subtropical climate with strong seasonal contrasts. Summers are hot, and while rainfall is spread fairly evenly, heavy downpours or afternoon thunderstorms can occur during warmer months. Winters are cold, bringing occasional snowfall. The area is fairly wet overall, with spring being the wettest season.

Based on climate normals · 1991–2020

Simpson weather averages

Annual high69ºF

Annual low48ºF

Precipitation49.28 inch

Snowfall9 inch

Daily normals Simpson - Illinois - January

Day	HighºF	LowºF	Prec/moinch	Prec/yrinch	Snow/moinch	Snow/yrinch
Jan 1	43.2	26.3	0.13	0.13	0.00	0.00
Jan 2	43.1	26.2	0.25	0.25	0.10	0.10
Jan 3	43.0	26.1	0.37	0.37	0.10	0.10
Jan 4	42.9	26.0	0.50	0.50	0.20	0.20
Jan 5	42.9	25.9	0.62	0.62	0.30	0.30
Jan 6	42.8	25.8	0.74	0.74	0.30	0.30
Jan 7	42.8	25.7	0.86	0.86	0.30	0.30
Jan 8	42.7	25.6	0.98	0.98	0.40	0.40
Jan 9	42.7	25.5	1.10	1.10	0.40	0.40
Jan 10	42.7	25.4	1.23	1.23	0.50	0.50
Jan 11	42.7	25.4	1.36	1.36	0.50	0.50
Jan 12	42.7	25.3	1.50	1.50	0.60	0.60
Jan 13	42.7	25.3	1.63	1.63	0.60	0.60
Jan 14	42.8	25.2	1.77	1.77	0.70	0.70
Jan 15	42.8	25.2	1.91	1.91	0.70	0.70
Jan 16	42.9	25.1	2.04	2.04	0.80	0.80
Jan 17	42.9	25.1	2.18	2.18	0.80	0.80
Jan 18	43.0	25.1	2.30	2.30	0.90	0.90
Jan 19	43.1	25.1	2.42	2.42	0.90	0.90
Jan 20	43.2	25.1	2.55	2.55	1.00	1.00
Jan 21	43.3	25.1	2.66	2.66	1.10	1.10
Jan 22	43.4	25.2	2.78	2.78	1.10	1.10
Jan 23	43.6	25.2	2.89	2.89	1.20	1.20
Jan 24	43.7	25.3	3.01	3.01	1.20	1.20
Jan 25	43.9	25.3	3.13	3.13	1.30	1.30
Jan 26	44.0	25.4	3.25	3.25	1.30	1.30
Jan 27	44.2	25.5	3.36	3.36	1.40	1.40
Jan 28	44.4	25.6	3.48	3.48	1.50	1.50
Jan 29	44.5	25.7	3.59	3.59	1.60	1.60
Jan 30	44.7	25.8	3.72	3.72	1.60	1.60
Jan 31	44.9	25.9	3.84	3.84	1.70	1.70

Precipitation and snow add up through the month (/mo) and the year (/yr)

Weather history Simpson - October 2026

Day	HighºF	LowºF	Precip.inch
Oct 1	–	–	0.60
Oct 2	–	–	0.48
Oct 3	–	–	0.00
Oct 4	–	–	0.00
Oct 5	–	–	0.00
Oct 6	–	–	0.00
Oct 7	–	–	0.00
Oct 8	–	–	0.00
Oct 9	–	–	0.00
Oct 10	–	–	0.01
Oct 11	–	–	0.00
Oct 12	–	–	0.00
Oct 13	–	–	–
Oct 14	–	–	–
Oct 15	–	–	–
Oct 16	–	–	–
Oct 17	–	–	–
Oct 18	–	–	–
Oct 19	–	–	–
Oct 20	–	–	–
Oct 21	–	–	–
Oct 22	–	–	–
Oct 23	–	–	–
Oct 24	–	–	–
Oct 25	–	–	–
Oct 26	–	–	–
Oct 27	–	–	–
Oct 28	–	–	–
Oct 29	–	–	–
Oct 30	–	–	–
Oct 31	–	–	–

The data for October 2026 is incomplete: some days or values are missing.

–No data
–Not yet observed or received
TTrace, too small to measure

Geo Simpson - Illinois

37.47°N, 88.76°W

Location

Country: United States
State: Illinois
County: –
City: Simpson
Zip Code: 62985
Elevation: 476 ft
Longitude: -88.76
Latitude: 37.47
ICAO: –
IATA: –

Map of Simpson - Illinois

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