Janesville Weather in 2021

Historical record of Janesville, Wisconsin weather for the year 2021 based on NOAA data.

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2021 Janesville Weather Extremes
Highest temperature	95 °F	June 12
Lowest temperature	-16 °F	February 8
Highest daily low	72 °F	July 7
Lowest daily high	-1 °F	February 15
Most daily precipitation	1.9 inches	July 15
Most daily snow	6.8 inches	January 31
Total annual precipitation	29.0 inches	-
Total annual snow	35.7 inches	-

What was the hottest temperature in Janesville in 2021?

The highest temperature recorded in Janesville, Wisconsin in 2021 was 95 °F which happened on June 12.

Highest Temperatures: All-Time By Year

Highest Temperatures in Janesville in 2021

Rank	Temperature	Date
1	95 °F	Jun 12
2	93 °F	Aug 29
2	93 °F	Aug 25
2	93 °F	Jul 6
2	93 °F	Jun 11
2	93 °F	Jun 6
7	92 °F	Aug 11
7	92 °F	Jul 27
7	92 °F	Jul 7
7	92 °F	Jun 10
7	92 °F	Jun 9

What was the coldest temperature in Janesville in 2021?

The lowest temperature recorded in Janesville, Wisconsin in 2021 was -16 °F which happened on Feb 8.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in Janesville in 2021

Rank	Temperature	Date
1	-16 °F	February 8
2	-15 °F	February 7
3	-12 °F	February 18
4	-11 °F	February 17
5	-10 °F	February 14
5	-10 °F	February 11
5	-10 °F	February 9
8	-8 °F	February 20
8	-8 °F	February 16
8	-8 °F	February 15

January 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
January 1	21	16	0.00	0.0
January 2	31	18	0.30	3.0
January 3	26	22	0.00	0.0
January 4	27	18	0.00	0.0
January 5	30	22	0.60	0.5
January 6	30	20	0.01	0.0
January 7	30	22	0.00	0.0
January 8	30	22	0.00	0.0
January 9	31	25	0.00	0.0
January 10	32	23	0.00	0.0
January 11	25	19	0.00	0.0
January 12	30	19	0.00	0.0
January 13	34	19	0.00	0.0
January 14	40	23	0.00	0.0
January 15	36	24	0.22	0.6
January 16	36	32	0.09	0.0
January 17	37	29	0.02	0.0
January 18	32	24	0.05	0.0
January 19	28	17	0.00	0.0
January 20	27	5	0.05	1.0
January 21	34	5	0.00	0.0
January 22	38	9	0.00	0.0
January 23	18	-1	0.00	0.0
January 24	26	-1	0.10	1.5
January 25	31	7	0.02	0.6
January 26	28	14	0.29	4.5
January 27	26	6	0.05	0.8
January 28	21	-3	0.00	0.0
January 29	20	-2	0.00	0.0
January 30	29	8	0.00	0.0
January 31	32	25	0.40	6.8

February 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
February 1	31	16	0.02	0.0
February 2	32	12	0.00	0.0
February 3	31	2	0.00	0.0
February 4	33	1	0.00	0.0
February 5	34	5	0.37	3.5
February 6	12	-1	0.00	0.0
February 7	8	-15	0.00	0.0
February 8	0	-16	0.00	0.0
February 9	7	-10	0.01	0.0
February 10	10	-7	0.00	0.0
February 11	11	-10	0.00	0.0
February 12	12	-4	0.05	2.0
February 13	8	-3	0.02	1.0
February 14	4	-10	0.03	1.5
February 15	-1	-8	0.00	0.0
February 16	6	-8	0.09	1.0
February 17	17	-11	0.00	0.0
February 18	20	-12	0.00	0.0
February 19	28	3	0.00	0.0
February 20	20	-8	0.00	0.0
February 21	24	-6	0.00	0.0
February 22	34	19	0.34	2.0
February 23	37	25	0.00	0.0
February 24	44	32	0.00	0.0
February 25	42	16	0.00	0.0
February 26	39	13	0.00	0.0
February 27	41	14	0.01	0.0
February 28	50	26	0.00	0.0

March 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
March 1	41	21	0.00	0.0
March 2	31	10	0.00	0.0
March 3	39	14	0.00	0.0
March 4	50	25	0.00	0.0
March 5	38	16	0.00	0.0
March 6	43	17	0.00	0.0
March 7	45	18	0.00	0.0
March 8	47	21	0.00	0.0
March 9	56	33	0.00	0.0
March 10	64	34	0.00	0.0
March 11	65	36	0.10	0.0
March 12	50	29	0.00	0.0
March 13	51	24	0.00	0.0
March 14	58	26	0.00	0.0
March 15	47	30	0.00	0.0
March 16	35	27	0.25	2.5
March 17	36	30	0.00	0.0
March 18	37	31	0.29	0.0
March 19	49	28	0.00	0.0
March 20	51	23	0.00	0.0
March 21	58	23	0.00	0.0
March 22	64	30	0.00	0.0
March 23	62	40	0.04	0.0
March 24	61	42	1.00	0.0
March 25	53	42	0.10	0.0
March 26	45	32	0.00	0.0
March 27	45	32	0.05	0.0
March 28	57	37	0.01	0.0
March 29	46	28	0.00	0.0
March 30	65	34	0.00	0.0
March 31	61	29	0.00	0.0

April 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
April 1	39	21	0.00
April 2	41	21	0.00
April 3	51	22	0.00
April 4	71	35	0.00
April 5	75	36	0.06
April 6	74	56	0.00
April 7	80	50	0.00
April 8	76	51	0.14
April 9	62	47	0.26
April 10	58	48	0.03
April 11	53	46	0.77
April 12	58	46	0.04
April 13	58	38	0.00
April 14	49	32	0.00
April 15	44	33	0.00
April 16	51	34	0.00
April 17	60	32	0.00
April 18	59	35	0.00
April 19	63	38	0.02
April 20	47	32	0.00
April 21	46	29	0.00
April 22	46	26	0.00
April 23	61	28	0.00
April 24	62	42	0.00
April 25	64	34	0.00
April 26	52	35	0.00
April 27	80	41	0.00
April 28	83	47	0.00
April 29	65	48	0.00
April 30	72	42	0.00

May 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
May 1	62	43	0.00
May 2	86	47	0.00
May 3	86	60	0.00
May 4	73	50	0.78
May 5	58	37	0.00
May 6	62	42	0.18
May 7	58	41	0.09
May 8	55	33	0.00
May 9	55	37	0.00
May 10	61	41	0.00
May 11	56	32	0.00
May 12	58	33	0.00
May 13	65	37	0.00
May 14	70	37	0.00
May 15	71	45	0.00
May 16	58	52	0.01
May 17	71	52	0.00
May 18	75	54	0.00
May 19	74	59	0.55
May 20	77	64	0.00
May 21	82	67	0.00
May 22	75	62	0.13
May 23	85	65	0.05
May 24	80	56	0.07
May 25	86	59	0.00
May 26	84	65	0.02
May 27	79	49	0.00
May 28	52	42	0.30
May 29	49	37	0.00
May 30	65	36	0.00
May 31	69	47	0.00

June 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
June 1	72	48	0.00
June 2	78	49	0.00
June 3	81	51	0.00
June 4	88	57	0.00
June 5	91	66	0.00
June 6	93	68	0.00
June 7	91	72	0.00
June 8	83	68	0.00
June 9	92	66	0.03
June 10	92	65	0.00
June 11	93	69	0.00
June 12	95	67	0.00
June 13	90	58	0.00
June 14	89	60	0.00
June 15	84	59	0.00
June 16	83	55	0.00
June 17	83	53	0.00
June 18	91	62	1.26
June 19	90	69	0.00
June 20	86	60	0.00
June 21	77	61	0.24
June 22	70	47	0.00
June 23	74	53	0.00
June 24	81	63	0.00
June 25	77	68	0.05
June 26	80	70	0.20
June 27	79	70	0.04
June 28	78	65	0.02
June 29	81	66	0.04
June 30	78	67	0.05

July 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
July 1	86	64	0.00
July 2	83	56	0.00
July 3	77	55	0.00
July 4	86	61	0.00
July 5	91	67	0.00
July 6	93	71	0.00
July 7	92	72	0.00
July 8	81	59	0.28
July 9	66	54	0.02
July 10	79	57	0.00
July 11	74	62	0.03
July 12	77	63	0.01
July 13	72	65	0.02
July 14	83	63	0.00
July 15	83	66	1.94
July 16	81	61	0.03
July 17	78	59	0.00
July 18	81	60	0.00
July 19	83	55	0.00
July 20	84	59	0.00
July 21	86	63	0.00
July 22	76	61	0.29
July 23	87	64	0.00
July 24	89	70	0.00
July 25	90	62	0.00
July 26	90	59	0.00
July 27	92	62	0.00
July 28	86	67	1.80
July 29	86	69	0.38
July 30	88	63	0.00
July 31	76	55	0.00

August 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
August 1	79	57	0.00
August 2	76	54	0.00
August 3	79	54	0.00
August 4	82	56	0.00
August 5	84	59	0.00
August 6	84	62	0.10
August 7	85	66	0.00
August 8	85	67	0.01
August 9	89	68	0.78
August 10	81	65	1.10
August 11	92	67	0.54
August 12	87	63	0.00
August 13	84	62	0.00
August 14	82	53	0.00
August 15	80	54	0.00
August 16	80	54	0.00
August 17	80	54	0.00
August 18	84	58	0.00
August 19	87	64	0.21
August 20	89	66	0.08
August 21	89	66	0.00
August 22	86	59	0.00
August 23	82	59	0.00
August 24	87	62	0.02
August 25	93	67	1.32
August 26	87	68	0.00
August 27	88	69	0.00
August 28	90	70	0.01
August 29	93	71	0.00
August 30	86	59	0.00
August 31	84	59	0.00

September 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
September 1	79	59	0.01
September 2	78	51	0.00
September 3	79	52	0.00
September 4	71	60	0.04
September 5	71	54	0.01
September 6	81	52	0.00
September 7	81	55	0.00
September 8	80	54	0.17
September 9	74	51	0.00
September 10	76	50	0.00
September 11	81	51	0.00
September 12	85	54	0.00
September 13	85	63	0.00
September 14	80	63	0.00
September 15	82	51	0.00
September 16	78	49	0.00
September 17	84	49	0.00
September 18	86	53	0.00
September 19	83	54	0.00
September 20	91	55	0.00
September 21	85	60	0.21
September 22	69	52	0.00
September 23	63	45	0.00
September 24	69	44	0.00
September 25	82	44	0.16
September 26	69	46	0.00
September 27	84	48	0.00
September 28	88	49	0.00
September 29	80	48	0.00
September 30	86	48	0.00

October 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
October 1	88	53	0.00
October 2	88	55	0.05
October 3	81	63	1.33
October 4	75	62	0.02
October 5	71	60	0.00
October 6	69	61	0.00
October 7	75	62	0.70
October 8	73	60	1.39
October 9	71	58	0.01
October 10	82	58	0.01
October 11	73	62	0.04
October 12	68	60	1.03
October 13	n/a	52	0.00
October 14	68	51	0.37
October 15	70	46	0.00
October 16	59	40	0.00
October 17	60	36	0.00
October 18	66	35	0.00
October 19	73	38	0.00
October 20	72	42	0.00
October 21	74	47	0.10
October 22	52	34	0.09
October 23	52	32	0.00
October 24	55	31	0.00
October 25	49	37	1.65
October 26	54	34	0.10
October 27	57	33	0.00
October 28	59	33	0.00
October 29	n/a	33	0.39
October 30	53	46	0.01
October 31	57	37	0.00

November 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)
November 1	53	31	0.00
November 2	49	30	0.00
November 3	46	23	0.00
November 4	43	22	0.00
November 5	53	31	0.00
November 6	56	31	0.00
November 7	62	36	0.00
November 8	66	36	0.00
November 9	67	41	0.00
November 10	62	31	0.00
November 11	57	32	0.00
November 12	53	34	0.30
November 13	38	33	0.04
November 14	37	31	0.04
November 15	37	27	0.00
November 16	32	24	0.00
November 17	58	25	0.00
November 18	56	28	0.00
November 19	32	19	0.00
November 20	40	19	0.00
November 21	50	33	0.00
November 22	54	18	0.00
November 23	35	18	0.00
November 24	45	18	0.00
November 25	53	37	0.00
November 26	37	13	0.00
November 27	29	16	0.00
November 28	42	26	0.00
November 29	40	19	0.00
November 30	43	25	0.00

December 2021 Janesville Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
December 1	51	26	0.00	0.0
December 2	50	35	0.00	0.0
December 3	53	36	0.01	0.0
December 4	48	29	0.00	0.0
December 5	39	29	0.00	0.0
December 6	36	30	0.14	0.0
December 7	31	7	0.00	0.0
December 8	23	10	0.01	0.3
December 9	30	n/a	0.00	0.0
December 10	40	29	0.00	0.0
December 11	41	31	0.54	0.0
December 12	38	28	0.00	0.0
December 13	46	29	0.00	0.0
December 14	49	25	0.00	0.0
December 15	54	30	0.00	0.0
December 16	67	34	0.00	0.0
December 17	37	20	0.00	0.0
December 18	36	19	0.00	0.0
December 19	35	20	0.00	0.0
December 20	34	23	0.00	0.0
December 21	38	17	0.00	0.0
December 22	36	14	0.00	0.0
December 23	28	14	0.00	0.0
December 24	43	22	0.00	0.0
December 25	48	38	0.00	0.0
December 26	46	19	0.00	0.0
December 27	42	19	0.40	0.0
December 28	39	24	0.00	0.0
December 29	34	24	0.26	2.6
December 30	25	18	0.00	0.0
December 31	31	19	0.00	0.0

Next Year >

Weather Station Details

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