Janesville Weather in 2020

Historical record of Janesville, Wisconsin weather for the year 2020 based on NOAA data.

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2020 Janesville Weather Extremes
Highest temperature	92 °F	August 28
Lowest temperature	-13 °F	February 15
Highest daily low	72 °F	August 27
Lowest daily high	12 °F	February 14
Most daily precipitation	2.7 inches	July 8
Most daily snow	11.0 inches	December 30
Total annual precipitation	39.6 inches	-
Total annual snow	45.7 inches	-

What was the hottest temperature in Janesville in 2020?

The highest temperature recorded in Janesville, Wisconsin in 2020 was 92 °F which happened 4 different times.

Highest Temperatures: All-Time By Year

Highest Temperatures in Janesville in 2020

Rank	Temperature	Date
1	92 °F	Aug 28
1	92 °F	Jul 27
1	92 °F	Jul 8
1	92 °F	Jul 7
5	91 °F	Aug 27
5	91 °F	Aug 26
5	91 °F	Aug 25
5	91 °F	Jul 6
5	91 °F	Jun 9
5	91 °F	Jun 3

What was the coldest temperature in Janesville in 2020?

The lowest temperature recorded in Janesville, Wisconsin in 2020 was -13 °F which happened 2 different times.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in Janesville in 2020

Rank	Temperature	Date
1	-13 °F	February 15
1	-13 °F	February 14
3	-2 °F	February 21
3	-2 °F	February 20
5	-1 °F	January 19
6	1 °F	January 22
6	1 °F	January 20
8	2 °F	January 21
9	4 °F	February 10
10	5 °F	December 25
10	5 °F	February 19

January 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
January 1	27	13	0.00	0.0
January 2	41	13	0.00	0.0
January 3	47	33	0.00	0.0
January 4	34	30	0.01	0.1
January 5	31	23	0.00	0.0
January 6	41	24	0.00	0.0
January 7	41	23	0.00	0.0
January 8	38	10	0.00	0.0
January 9	33	9	0.00	0.0
January 10	50	31	0.00	0.0
January 11	40	25	0.60	0.0
January 12	25	18	0.08	1.7
January 13	29	18	0.05	0.5
January 14	33	28	0.00	0.0
January 15	35	21	0.00	0.0
January 16	32	8	0.02	0.1
January 17	17	7	0.00	0.0
January 18	32	7	0.64	6.5
January 19	32	-1	0.00	0.5
January 20	19	1	0.00	0.0
January 21	26	2	0.00	0.0
January 22	25	1	0.00	0.0
January 23	31	22	0.11	1.0
January 24	33	28	0.13	1.3
January 25	36	32	0.40	2.0
January 26	34	30	0.02	0.2
January 27	32	27	0.00	0.0
January 28	32	27	0.00	0.0
January 29	29	24	0.00	0.0
January 30	28	24	0.00	0.0
January 31	32	25	0.01	0.1

February 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
February 1	35	29	0.03	0.0
February 2	39	32	0.00	0.0
February 3	48	24	0.00	0.0
February 4	43	25	0.00	0.0
February 5	32	18	0.00	0.0
February 6	28	18	0.00	0.0
February 7	34	17	0.00	0.0
February 8	35	18	0.00	0.0
February 9	33	19	0.00	0.0
February 10	32	4	0.55	5.5
February 11	30	6	0.00	0.0
February 12	30	11	0.00	0.0
February 13	35	11	0.15	4.0
February 14	12	-13	0.00	0.0
February 15	19	-13	0.00	0.0
February 16	32	9	0.00	0.0
February 17	35	11	0.00	0.0
February 18	35	30	0.58	5.8
February 19	34	5	0.00	0.0
February 20	22	-2	0.00	0.0
February 21	17	-2	0.00	0.0
February 22	33	6	0.00	0.0
February 23	43	23	0.00	0.0
February 24	48	26	0.00	0.0
February 25	40	30	0.00	0.0
February 26	36	24	0.00	0.0
February 27	30	20	0.00	0.0
February 28	30	13	0.00	0.0
February 29	28	8	0.00	0.0

March 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
March 1	36	9	0.00	0.0
March 2	56	28	0.00	0.0
March 3	40	28	0.00	0.0
March 4	43	28	0.04	0.5
March 5	44	28	0.00	0.0
March 6	47	29	0.00	0.0
March 7	39	24	0.00	0.0
March 8	52	25	0.00	0.0
March 9	64	36	0.00	0.0
March 10	49	34	0.86	0.0
March 11	50	33	0.00	0.0
March 12	44	33	0.00	0.0
March 13	53	30	0.01	0.0
March 14	46	30	0.00	0.0
March 15	35	28	0.02	0.2
March 16	44	26	0.00	0.0
March 17	39	29	0.00	0.0
March 18	47	29	0.00	0.0
March 19	42	36	0.12	0.0
March 20	53	35	1.32	0.0
March 21	36	22	0.00	0.0
March 22	39	22	0.00	0.0
March 23	36	27	0.09	0.9
March 24	39	27	0.00	0.0
March 25	51	30	0.00	0.0
March 26	58	35	0.00	0.0
March 27	45	34	0.01	0.0
March 28	54	35	0.58	0.0
March 29	59	42	0.23	0.0
March 30	43	36	0.00	0.0
March 31	55	35	0.00	0.0

April 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
April 1	39	34	0.00
April 2	55	33	0.00
April 3	62	34	0.00
April 4	68	31	0.11
April 5	53	31	0.00
April 6	56	31	0.00
April 7	60	34	0.02
April 8	77	44	0.01
April 9	62	35	0.10
April 10	46	29	0.01
April 11	48	29	0.00
April 12	59	41	0.18
April 13	63	32	0.60
April 14	41	25	0.00
April 15	36	24	0.00
April 16	39	23	0.00
April 17	45	24	0.00
April 18	47	32	0.00
April 19	58	34	0.00
April 20	58	29	0.00
April 21	64	31	0.04
April 22	51	33	0.00
April 23	60	39	0.20
April 24	54	40	0.00
April 25	53	40	0.00
April 26	53	41	0.00
April 27	66	40	0.00
April 28	63	41	0.14
April 29	68	44	0.61
April 30	50	46	0.67

May 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
May 1	65	36	0.00
May 2	67	39	0.00
May 3	75	45	0.00
May 4	73	38	0.00
May 5	n/a	38	0.01
May 6	50	36	0.03
May 7	65	39	0.00
May 8	64	34	0.00
May 9	48	29	0.00
May 10	60	33	0.00
May 11	47	34	0.35
May 12	52	33	0.00
May 13	62	37	0.00
May 14	67	45	0.86
May 15	68	53	0.47
May 16	75	49	0.00
May 17	70	51	0.77
May 18	58	50	0.83
May 19	59	50	0.01
May 20	59	50	0.00
May 21	67	53	0.00
May 22	68	55	0.00
May 23	70	55	0.00
May 24	76	59	1.68
May 25	84	63	0.00
May 26	85	64	0.00
May 27	86	64	0.00
May 28	86	67	0.03
May 29	74	56	0.50
May 30	69	49	0.00
May 31	71	45	0.00

June 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
June 1	72	44	0.00
June 2	77	59	0.02
June 3	91	66	0.15
June 4	85	64	0.00
June 5	88	64	0.00
June 6	86	59	0.00
June 7	81	56	0.00
June 8	82	59	0.00
June 9	91	65	0.00
June 10	87	68	1.05
June 11	80	56	0.21
June 12	80	53	0.00
June 13	84	48	0.00
June 14	68	49	0.00
June 15	71	46	0.00
June 16	78	48	0.00
June 17	84	57	0.00
June 18	87	57	0.00
June 19	87	61	0.00
June 20	88	61	0.00
June 21	83	62	0.20
June 22	85	65	0.08
June 23	76	57	0.37
June 24	76	56	0.03
June 25	78	55	0.20
June 26	82	60	0.00
June 27	77	64	0.35
June 28	87	67	0.00
June 29	86	69	0.00
June 30	89	66	1.60

July 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
July 1	88	68	0.00
July 2	87	66	0.00
July 3	88	65	0.00
July 4	89	67	0.00
July 5	89	65	0.00
July 6	91	68	0.00
July 7	92	70	0.00
July 8	92	67	2.70
July 9	90	69	0.00
July 10	90	66	0.64
July 11	83	63	0.00
July 12	83	66	0.12
July 13	80	60	0.00
July 14	83	64	0.00
July 15	84	66	0.20
July 16	76	63	1.47
July 17	83	62	0.00
July 18	87	66	0.00
July 19	88	71	0.14
July 20	84	63	0.00
July 21	81	64	0.00
July 22	80	66	0.02
July 23	82	56	0.00
July 24	81	59	0.00
July 25	86	63	0.00
July 26	90	69	0.00
July 27	92	71	0.63
July 28	83	61	0.00
July 29	85	65	0.00
July 30	86	69	0.00
July 31	82	61	0.00

August 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
August 1	81	61	0.00
August 2	79	61	0.00
August 3	80	56	0.03
August 4	67	52	0.00
August 5	74	51	0.00
August 6	76	51	0.00
August 7	81	55	0.00
August 8	83	58	0.00
August 9	89	68	0.00
August 10	87	69	0.60
August 11	84	58	1.97
August 12	82	57	0.00
August 13	84	59	0.00
August 14	84	60	0.00
August 15	86	62	0.00
August 16	77	57	0.00
August 17	83	58	0.00
August 18	82	60	0.00
August 19	77	53	0.00
August 20	81	55	0.00
August 21	82	57	0.00
August 22	84	58	0.00
August 23	84	62	0.01
August 24	88	66	0.00
August 25	91	68	0.01
August 26	91	68	0.00
August 27	91	72	0.00
August 28	92	69	0.00
August 29	90	66	0.00
August 30	79	52	0.00
August 31	79	52	0.00

September 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
September 1	80	52	0.20
September 2	70	52	0.29
September 3	83	55	0.00
September 4	79	48	0.00
September 5	78	47	0.00
September 6	79	55	1.54
September 7	80	58	0.19
September 8	68	52	0.83
September 9	55	50	0.65
September 10	55	48	0.06
September 11	56	49	0.19
September 12	62	54	1.22
September 13	69	54	0.06
September 14	73	50	0.00
September 15	74	51	0.00
September 16	80	53	0.00
September 17	79	55	0.00
September 18	69	51	0.00
September 19	65	38	0.00
September 20	67	39	0.00
September 21	71	42	0.00
September 22	74	45	0.00
September 23	79	50	0.00
September 24	78	51	0.00
September 25	77	52	0.00
September 26	79	53	0.00
September 27	76	61	0.00
September 28	68	51	0.22
September 29	60	42	0.06
September 30	56	42	0.01

October 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
October 1	62	42	0.00
October 2	59	34	0.02
October 3	54	34	0.00
October 4	55	37	0.03
October 5	54	31	0.00
October 6	63	31	0.00
October 7	74	45	0.00
October 8	73	39	0.00
October 9	69	39	0.00
October 10	82	50	0.00
October 11	75	49	0.00
October 12	71	49	0.00
October 13	64	37	0.32
October 14	69	39	0.00
October 15	72	44	0.00
October 16	54	31	0.00
October 17	53	32	0.00
October 18	62	41	0.00
October 19	46	30	0.23
October 20	40	30	0.02
October 21	48	32	0.08
October 22	55	43	1.23
October 23	65	40	0.72
October 24	42	30	0.07
October 25	43	32	0.00
October 26	39	31	0.00
October 27	35	29	0.00
October 28	42	26	0.00
October 29	50	27	0.00
October 30	42	29	0.00
October 31	43	26	0.00

November 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
November 1	59	30	0.00	0.0
November 2	41	21	0.00	0.0
November 3	52	23	0.00	0.0
November 4	69	30	0.00	0.0
November 5	71	40	0.00	0.0
November 6	71	38	0.00	0.0
November 7	73	38	0.00	0.0
November 8	72	51	0.00	0.0
November 9	72	51	0.00	0.0
November 10	75	64	0.00	0.0
November 11	70	32	0.36	0.0
November 12	40	30	0.00	0.0
November 13	54	28	0.00	0.0
November 14	38	24	0.00	0.0
November 15	51	31	0.26	0.0
November 16	39	26	0.00	0.0
November 17	44	24	0.00	0.0
November 18	42	24	0.00	0.0
November 19	50	33	0.00	0.0
November 20	64	44	0.00	0.0
November 21	56	28	0.00	0.0
November 22	43	28	0.00	0.0
November 23	46	29	0.00	0.0
November 24	43	28	0.14	1.4
November 25	42	32	0.33	n/a
November 26	42	37	0.52	0.0
November 27	45	33	0.00	0.0
November 28	43	25	0.00	0.0
November 29	50	26	0.00	0.0
November 30	47	29	0.00	0.0

December 2020 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
December 1	30	16	0.00	0.0
December 2	35	16	0.00	0.0
December 3	47	17	0.00	0.0
December 4	40	26	0.00	0.0
December 5	45	19	0.00	0.0
December 6	39	19	0.00	0.0
December 7	39	27	0.00	0.0
December 8	36	30	0.00	0.0
December 9	34	26	0.00	0.0
December 10	53	24	0.00	0.0
December 11	55	24	0.00	0.0
December 12	40	32	0.93	1.0
December 13	33	16	0.06	1.2
December 14	28	15	0.00	0.0
December 15	27	14	0.00	0.0
December 16	28	15	0.00	0.0
December 17	33	25	0.00	0.0
December 18	34	13	0.00	0.0
December 19	36	13	0.00	0.0
December 20	37	28	0.00	0.0
December 21	35	27	0.00	0.0
December 22	41	27	0.00	0.0
December 23	44	27	0.00	0.0
December 24	57	10	0.00	0.0
December 25	13	5	0.00	0.0
December 26	21	6	0.00	0.0
December 27	30	14	0.00	0.0
December 28	38	24	0.01	0.2
December 29	30	10	0.00	0.0
December 30	32	12	1.10	11.0
December 31	32	20	0.00	0.0

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Weather Station Details

Years	Station	Coordinates
1987–2024	Afton-Janesville WWTP	location
1893–1987	Janesville	location