Climate Janesville - Wisconsin

	JanJa	FebFe	MarMa	AprAp	MayMa	JunJu
Average high in ºF Av. high Hi	28	33	45	58	70	80
Average low in ºF Av. low Lo	11	15	26	37	47	57
Av. precipitation in inch Av. precip. Pre.	1.37	1.43	1.96	3.45	3.77	4.36
Av. snowfall in inch Snowfall Sn	11	9	4	1	0	0

	JulJu	AugAu	SepSe	OctOc	NovNo	DecDe
Average high in ºF Av. high Hi	83	81	74	61	46	32
Average low in ºF Av. low Lo	61	59	50	38	29	15
Av. precipitation in inch Av. precip. Pre.	3.78	4.47	3.31	2.93	2.44	1.88
Av. snowfall in inch Snowfall Sn	0	0	0	0	2	9

Janesville Climate Graph - Wisconsin Climate Chart

Day	High ºF	Low ºF	Prec/mo inch	Prec/yr inch	Snow/mo inch	Snow/yr inch
1 Jan	28.1	11.8	0.04	0.04	0.31	0.80
2 Jan	28.1	11.7	0.12	0.12	0.59	1.50
3 Jan	28.0	11.6	0.16	0.16	0.91	2.30
4 Jan	28.0	11.5	0.20	0.20	1.18	3.00
5 Jan	28.0	11.4	0.24	0.24	1.50	3.80
6 Jan	27.9	11.4	0.28	0.28	1.81	4.60
7 Jan	27.9	11.3	0.31	0.31	2.09	5.30
8 Jan	27.9	11.2	0.35	0.35	2.52	6.40
9 Jan	27.9	11.2	0.43	0.43	2.80	7.10
10 Jan	27.9	11.1	0.47	0.47	3.11	7.90
11 Jan	27.9	11.1	0.51	0.51	3.50	8.90
12 Jan	28.0	11.1	0.55	0.55	3.90	9.90
13 Jan	28.0	11.0	0.59	0.59	4.29	10.90
14 Jan	28.0	11.0	0.67	0.67	4.61	11.70
15 Jan	28.0	11.0	0.71	0.71	5.00	12.70
16 Jan	28.1	10.9	0.75	0.75	5.39	13.70
17 Jan	28.1	10.9	0.79	0.79	5.79	14.70
18 Jan	28.2	10.9	0.83	0.83	6.18	15.70
19 Jan	28.2	10.9	0.87	0.87	6.61	16.80
20 Jan	28.3	10.9	0.91	0.91	6.89	17.50
21 Jan	28.3	11.0	0.94	0.94	7.20	18.30
22 Jan	28.4	11.0	0.98	0.98	7.60	19.30
23 Jan	28.5	11.0	1.02	1.02	7.91	20.10
24 Jan	28.6	11.0	1.06	1.06	8.19	20.80
25 Jan	28.7	11.1	1.10	1.10	8.58	21.80
26 Jan	28.8	11.1	1.14	1.14	8.90	22.60
27 Jan	28.9	11.2	1.18	1.18	9.29	23.60
28 Jan	29.0	11.3	1.22	1.22	9.61	24.40
29 Jan	29.1	11.4	1.30	1.30	10.00	25.40
30 Jan	29.2	11.5	1.34	1.34	10.39	26.40
31 Jan	29.3	11.6	1.38	1.38	10.79	27.40

Day	High ºF	Low ºF	Precip. inch	Snow inch	Snow d. inch
01 May	54.0	37.0	0.12	-	-
02 May	52.0	30.9	T	-	-
03 May	57.9	32.0	T	-	-
04 May	70.0	41.0	T	-	-
05 May	81.0	45.0	0.00	-	-
06 May	81.0	33.1	0.00	0.00	0.0
07 May	55.0	30.9	0.00	-	-
08 May	64.0	34.0	0.00	-	-
09 May	-	-	-	-	-
10 May	-	-	-	-	-
11 May	64.9	39.9	0.00	-	-
12 May	64.0	39.9	0.00	-	-
13 May	75.0	45.0	0.01	-	-
14 May	66.0	37.0	0.00	-	-
15 May	73.0	43.0	0.00	-	-
16 May	81.0	57.9	0.14	-	-
17 May	84.0	60.1	0.00	-	-
18 May	84.0	62.1	0.08	0.00	0.0
19 May	81.0	64.0	0.11	0.00	0.0
20 May	75.0	44.1	0.00	0.00	0.0
21 May	66.9	44.1	0.00	-	-
22 May	59.0	46.0	0.00	-	-
23 May	70.0	50.0	0.00	-	-
24 May	78.1	55.9	0.01	-	-
25 May	81.0	53.1	0.00	0.00	0.0
26 May	86.0	57.0	0.00	0.00	0.0
27 May	90.0	57.0	0.00	-	-
28 May	90.0	57.0	0.00	-	-
29 May	82.0	46.9	0.00	-	-
30 May	-	-	-	-	-
31 May	-	-	-	-	-

	May 26	Normal
Average high temperature Av. high temp.	72.8 ºF	28 ºF
Average low temperature Av. low temp.	46.1 ºF	11 ºF
Total precipitation Total precip.	0.47 inch	1.37 inch
Total snowfall Total snowfall	- inch	11 inch

Highest max temperature Highest max temp.	90.0 ºF	-
Lowest max temperature Lowest max temp.	52.0 ºF	-
Highest min temperature Highest min temp.	64.0 ºF	-
Lowest min temperature Lowest min temp.	30.9 ºF	-

Past weather May 2026 incomplete - Missing data

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Station Data

Monthly averages Janesville
Longitude: -89.0187, Latitude: 42.6828
Average weather Janesville, WI - 53545

Monthly: 1991-2020 normals
History: 2008-2026

Abbreviations

Average precipitation in : Av. precipitation in
Jan: January, Feb: February, ...Jan: January, Feb: February, ...Ja: January, Fe: February, ...