Janesville Average Weather by Day

Data and chart of the the average high and low temperature for every day of the year in Janesville, Wisconsin, based on NOAA data.
Also see:
What's the hottest day of the year in Janesville?
On average, July 20 is the hottest day of the year Janesville, Wisconsin. From 1991–2020, the average high temperature on July 20 was 83.8 °F and the average low was 61.6 °F.
What's the coldest day of the year in Janesville?
On average, January 28 is the coldest day of the year Janesville, Wisconsin. From 1991–2020, the average high temperature on January 28 was 28.2 °F, and the average low was 11.0 °F.
Average Temperature by Day
  • Average temperatures from 1991–2020. Daily averages are a mean of the period from 14 days before to 14 days after, inclusive.
Day Average (°F)
High Low
January 1 30.4 14.2
January 2 30.2 14.1
January 3 30.1 13.9
January 4 29.9 13.6
January 5 29.7 13.3
January 6 29.5 12.9
January 7 29.3 12.5
January 8 29.1 12.4
January 9 29.1 12.4
January 10 29.0 12.3
January 11 28.8 12.1
January 12 28.7 11.9
January 13 28.5 11.7
January 14 28.4 11.6
January 15 28.3 11.4
January 16 28.2 11.3
January 17 28.2 11.3
January 18 28.1 11.2
January 19 28.1 11.1
January 20 28.0 11.1
January 21 28.1 11.2
January 22 28.1 11.1
January 23 28.2 11.1
January 24 28.3 11.2
January 25 28.3 11.3
January 26 28.2 11.2
January 27 28.2 11.1
January 28 28.2 11.0
January 29 28.3 11.0
January 30 28.4 10.9
January 31 28.5 11.0
February 1 28.8 11.0
February 2 28.9 11.3
February 3 29.1 11.5
February 4 29.4 11.8
February 5 29.8 12.0
February 6 30.1 12.3
February 7 30.4 12.5
February 8 30.7 12.8
February 9 31.0 13.1
February 10 31.3 13.4
February 11 31.5 13.6
February 12 31.6 13.8
February 13 31.9 14.0
February 14 32.2 14.3
February 15 32.5 14.5
February 16 32.8 14.8
February 17 32.9 14.9
February 18 33.1 15.0
February 19 33.4 15.2
February 20 33.7 15.6
February 21 34.1 15.9
February 22 34.4 16.2
February 23 34.8 16.6
February 24 35.2 16.9
February 25 35.6 17.2
February 26 36.0 17.6
February 27 36.5 18.1
February 28 37.1 18.6
March 1 37.6 19.0
March 2 38.0 19.5
March 3 38.6 19.9
March 4 39.1 20.4
March 5 39.5 20.8
March 6 39.9 21.3
March 7 40.3 21.6
March 8 40.7 21.9
March 9 41.1 22.2
March 10 41.5 22.5
March 11 41.9 22.8
March 12 42.3 23.2
March 13 42.9 23.7
March 14 43.5 24.2
March 15 44.1 24.6
March 16 44.5 25.1
March 17 45.1 25.5
March 18 45.7 26.0
March 19 46.3 26.6
March 20 46.9 27.1
March 21 47.5 27.5
March 22 47.9 27.8
March 23 48.3 28.1
March 24 48.8 28.4
March 25 49.3 28.8
March 26 49.7 29.2
March 27 50.1 29.5
March 28 50.5 29.9
March 29 50.9 30.2
March 30 51.1 30.5
March 31 51.5 30.8
April 1 51.9 31.2
April 2 52.4 31.5
April 3 52.8 31.9
April 4 53.2 32.2
April 5 53.8 32.6
April 6 54.2 33.0
April 7 54.7 33.3
April 8 55.1 33.6
April 9 55.5 33.9
April 10 56.0 34.2
April 11 56.5 34.5
April 12 56.8 34.8
April 13 57.2 35.1
April 14 57.5 35.3
April 15 57.8 35.6
April 16 58.0 35.9
April 17 58.4 36.3
April 18 58.7 36.7
April 19 59.0 37.1
April 20 59.5 37.5
April 21 60.0 37.9
April 22 60.4 38.3
April 23 60.9 38.7
April 24 61.4 39.2
April 25 61.9 39.8
April 26 62.4 40.2
April 27 62.8 40.6
April 28 63.3 41.0
April 29 63.7 41.3
April 30 63.9 41.6
May 1 64.1 42.0
May 2 64.6 42.3
May 3 64.9 42.7
May 4 65.1 42.9
May 5 65.4 43.2
May 6 65.8 43.5
May 7 66.3 43.9
May 8 66.6 44.3
May 9 67.1 44.8
May 10 67.4 45.1
May 11 67.7 45.5
May 12 68.1 46.0
May 13 68.6 46.4
May 14 69.0 46.9
May 15 69.5 47.3
May 16 70.0 47.6
May 17 70.5 48.0
May 18 70.8 48.3
May 19 71.3 48.7
May 20 71.5 49.0
May 21 71.8 49.3
May 22 72.0 49.6
May 23 72.3 49.8
May 24 72.6 50.0
May 25 72.9 50.4
May 26 73.2 50.7
May 27 73.6 51.1
May 28 74.1 51.6
May 29 74.5 52.0
May 30 74.9 52.4
May 31 75.3 52.8
June 1 75.6 53.1
June 2 76.0 53.5
June 3 76.4 53.9
June 4 76.8 54.3
June 5 77.2 54.7
June 6 77.5 55.1
June 7 77.7 55.4
June 8 78.0 55.7
June 9 78.3 56.0
June 10 78.6 56.3
June 11 78.9 56.6
June 12 79.2 56.8
June 13 79.4 57.1
June 14 79.7 57.3
June 15 79.8 57.5
June 16 80.1 57.8
June 17 80.2 58.0
June 18 80.5 58.2
June 19 80.7 58.5
June 20 80.9 58.7
June 21 81.1 59.1
June 22 81.4 59.3
June 23 81.6 59.5
June 24 81.7 59.7
June 25 81.9 59.8
June 26 82.0 59.9
June 27 82.2 59.9
June 28 82.3 60.0
June 29 82.4 60.1
June 30 82.5 60.2
July 1 82.6 60.3
July 2 82.7 60.5
July 3 82.7 60.5
July 4 82.8 60.7
July 5 83.0 60.9
July 6 83.1 61.0
July 7 83.2 61.2
July 8 83.3 61.3
July 9 83.4 61.3
July 10 83.4 61.3
July 11 83.4 61.4
July 12 83.5 61.4
July 13 83.4 61.4
July 14 83.5 61.5
July 15 83.5 61.5
July 16 83.5 61.6
July 17 83.5 61.6
July 18 83.6 61.7
July 19 83.7 61.7
July 20 83.8 61.6
July 21 83.8 61.6
July 22 83.7 61.5
July 23 83.6 61.4
July 24 83.6 61.4
July 25 83.6 61.4
July 26 83.5 61.4
July 27 83.4 61.4
July 28 83.4 61.4
July 29 83.2 61.3
July 30 83.1 61.3
July 31 83.0 61.1
August 1 82.9 61.0
August 2 82.8 60.8
August 3 82.7 60.6
August 4 82.6 60.5
August 5 82.4 60.3
August 6 82.3 60.1
August 7 82.2 60.0
August 8 82.2 60.0
August 9 82.1 59.9
August 10 82.1 59.8
August 11 82.0 59.7
August 12 82.0 59.7
August 13 82.0 59.6
August 14 82.1 59.6
August 15 82.0 59.5
August 16 81.9 59.4
August 17 81.7 59.2
August 18 81.5 59.0
August 19 81.4 58.8
August 20 81.4 58.7
August 21 81.3 58.6
August 22 81.3 58.4
August 23 81.2 58.1
August 24 81.1 58.0
August 25 81.0 57.8
August 26 80.7 57.6
August 27 80.6 57.3
August 28 80.4 57.1
August 29 80.3 56.8
August 30 80.1 56.6
August 31 79.9 56.3
September 1 79.6 56.1
September 2 79.3 55.8
September 3 79.2 55.5
September 4 79.1 55.2
September 5 78.9 55.0
September 6 78.6 54.7
September 7 78.3 54.4
September 8 78.0 54.1
September 9 77.6 53.6
September 10 77.2 53.2
September 11 76.8 52.8
September 12 76.5 52.3
September 13 76.2 51.9
September 14 75.7 51.5
September 15 75.3 51.1
September 16 74.9 50.7
September 17 74.5 50.3
September 18 74.1 49.9
September 19 73.6 49.5
September 20 73.1 49.2
September 21 72.6 48.7
September 22 72.1 48.2
September 23 71.7 47.9
September 24 71.5 47.5
September 25 71.2 47.1
September 26 70.9 46.7
September 27 70.6 46.3
September 28 70.2 45.9
September 29 69.8 45.5
September 30 69.4 45.1
October 1 68.9 44.7
October 2 68.3 44.3
October 3 67.8 43.9
October 4 67.3 43.5
October 5 66.8 42.9
October 6 66.3 42.5
October 7 65.9 42.1
October 8 65.5 41.8
October 9 65.1 41.4
October 10 64.7 41.2
October 11 64.1 40.8
October 12 63.6 40.4
October 13 63.1 40.2
October 14 62.7 39.9
October 15 62.2 39.6
October 16 61.7 39.3
October 17 61.2 39.0
October 18 60.8 38.7
October 19 60.3 38.3
October 20 59.8 37.9
October 21 59.4 37.6
October 22 58.8 37.3
October 23 58.3 36.9
October 24 57.6 36.5
October 25 57.0 36.1
October 26 56.5 35.8
October 27 55.9 35.5
October 28 55.5 35.1
October 29 54.9 34.7
October 30 54.3 34.2
October 31 53.8 33.8
November 1 53.3 33.4
November 2 52.8 33.1
November 3 52.3 32.8
November 4 51.8 32.5
November 5 51.3 32.3
November 6 50.8 32.0
November 7 50.3 31.6
November 8 49.7 31.2
November 9 49.3 30.8
November 10 48.8 30.4
November 11 48.3 29.9
November 12 47.9 29.6
November 13 47.5 29.2
November 14 46.9 28.8
November 15 46.4 28.4
November 16 46.0 28.1
November 17 45.5 27.7
November 18 45.1 27.4
November 19 44.6 27.1
November 20 44.1 26.7
November 21 43.7 26.4
November 22 43.2 25.9
November 23 42.6 25.5
November 24 42.0 25.1
November 25 41.3 24.7
November 26 40.8 24.3
November 27 40.4 24.0
November 28 39.9 23.6
November 29 39.6 23.3
November 30 39.2 23.1
December 1 38.9 22.8
December 2 38.5 22.4
December 3 38.1 22.1
December 4 37.6 21.6
December 5 37.2 21.1
December 6 36.8 20.8
December 7 36.4 20.5
December 8 35.9 20.2
December 9 35.5 19.9
December 10 35.2 19.6
December 11 34.8 19.2
December 12 34.5 18.9
December 13 34.2 18.7
December 14 33.9 18.4
December 15 33.6 18.1
December 16 33.4 17.8
December 17 33.2 17.6
December 18 32.9 17.2
December 19 32.6 16.8
December 20 32.3 16.6
December 21 32.2 16.4
December 22 32.1 16.3
December 23 31.9 16.0
December 24 31.8 15.8
December 25 31.6 15.6
December 26 31.4 15.4
December 27 31.4 15.2
December 28 31.2 15.1
December 29 31.1 15.0
December 30 30.9 14.8
December 31 30.6 14.5
Weather Station Details
Years Station Coordinates
1987–2024 Afton-Janesville WWTP location
1893–1987 Janesville location
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