Fairfield Average Weather by Day

Data and chart of the the average high and low temperature for every day of the year in Fairfield, Illinois, based on NOAA data.

Also see:

What's the hottest day of the year in Fairfield?

On average, July 21 is the hottest day of the year Fairfield, Illinois. From 1991–2020, the average high temperature on July 21 was 88.8 °F and the average low was 66.3 °F.

What's the coldest day of the year in Fairfield?

On average, January 17 is the coldest day of the year Fairfield, Illinois. From 1991–2020, the average high temperature on January 17 was 39.9 °F, and the average low was 23.1 °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)
Day	High	Low
January 1	41.2	25.1
January 2	41.1	24.9
January 3	41.0	24.8
January 4	40.8	24.6
January 5	40.6	24.4
January 6	40.4	24.1
January 7	40.3	23.9
January 8	40.4	23.9
January 9	40.5	24.0
January 10	40.3	24.0
January 11	40.2	23.8
January 12	40.1	23.7
January 13	40.1	23.6
January 14	40.0	23.4
January 15	40.0	23.3
January 16	39.9	23.2
January 17	39.9	23.1
January 18	40.0	23.1
January 19	40.1	23.2
January 20	40.3	23.2
January 21	40.4	23.2
January 22	40.6	23.2
January 23	40.7	23.3
January 24	40.8	23.3
January 25	40.9	23.4
January 26	40.9	23.3
January 27	40.8	23.2
January 28	40.9	23.2
January 29	41.0	23.4
January 30	41.1	23.5
January 31	41.4	23.6
February 1	41.5	23.7
February 2	41.8	23.9
February 3	42.0	24.1
February 4	42.3	24.2
February 5	42.5	24.5
February 6	42.9	24.7
February 7	43.2	25.0
February 8	43.5	25.3
February 9	43.9	25.5
February 10	44.1	25.7
February 11	44.3	25.9
February 12	44.5	26.1
February 13	44.8	26.3
February 14	45.2	26.5
February 15	45.6	26.8
February 16	45.7	26.9
February 17	45.8	27.1
February 18	46.0	27.2
February 19	46.3	27.4
February 20	46.7	27.7
February 21	47.1	27.9
February 22	47.5	28.1
February 23	47.9	28.4
February 24	48.2	28.7
February 25	48.5	28.9
February 26	48.9	29.1
February 27	49.4	29.5
February 28	49.8	29.9
March 1	50.3	30.1
March 2	50.7	30.4
March 3	51.2	30.9
March 4	51.7	31.3
March 5	52.0	31.6
March 6	52.4	32.0
March 7	52.7	32.2
March 8	52.9	32.3
March 9	53.2	32.5
March 10	53.6	32.8
March 11	53.9	33.1
March 12	54.3	33.4
March 13	54.7	33.7
March 14	55.1	34.1
March 15	55.4	34.5
March 16	55.8	34.8
March 17	56.3	35.2
March 18	56.9	35.5
March 19	57.4	36.0
March 20	57.8	36.4
March 21	58.1	36.7
March 22	58.4	36.9
March 23	58.7	37.2
March 24	59.2	37.6
March 25	59.6	38.1
March 26	60.1	38.5
March 27	60.5	38.8
March 28	61.0	39.2
March 29	61.4	39.5
March 30	61.7	39.8
March 31	62.2	40.1
April 1	62.6	40.5
April 2	62.9	40.8
April 3	63.4	41.1
April 4	63.9	41.4
April 5	64.3	41.8
April 6	64.8	42.2
April 7	65.1	42.6
April 8	65.5	42.8
April 9	65.9	43.1
April 10	66.2	43.4
April 11	66.5	43.8
April 12	66.9	44.1
April 13	67.2	44.3
April 14	67.4	44.5
April 15	67.7	44.8
April 16	68.1	45.2
April 17	68.3	45.6
April 18	68.6	45.8
April 19	68.9	46.1
April 20	69.2	46.5
April 21	69.6	46.8
April 22	69.9	47.1
April 23	70.3	47.4
April 24	70.7	47.8
April 25	71.0	48.2
April 26	71.2	48.5
April 27	71.6	48.9
April 28	71.9	49.2
April 29	72.0	49.5
April 30	72.2	49.6
May 1	72.4	49.9
May 2	72.6	50.1
May 3	72.8	50.4
May 4	73.0	50.7
May 5	73.2	50.9
May 6	73.5	51.1
May 7	73.7	51.4
May 8	74.1	51.7
May 9	74.6	52.0
May 10	74.9	52.4
May 11	75.3	52.7
May 12	75.6	53.1
May 13	76.1	53.5
May 14	76.4	53.9
May 15	76.7	54.2
May 16	77.1	54.5
May 17	77.4	54.8
May 18	77.8	55.2
May 19	78.1	55.5
May 20	78.3	55.8
May 21	78.5	56.1
May 22	78.7	56.3
May 23	78.9	56.4
May 24	79.2	56.7
May 25	79.5	56.9
May 26	79.8	57.2
May 27	80.2	57.5
May 28	80.6	57.9
May 29	81.0	58.3
May 30	81.3	58.7
May 31	81.7	59.0
June 1	82.0	59.2
June 2	82.4	59.5
June 3	82.7	59.9
June 4	83.1	60.2
June 5	83.5	60.6
June 6	83.7	60.9
June 7	84.0	61.2
June 8	84.2	61.4
June 9	84.5	61.7
June 10	84.8	61.9
June 11	85.0	62.1
June 12	85.1	62.2
June 13	85.3	62.4
June 14	85.5	62.5
June 15	85.7	62.7
June 16	86.0	62.9
June 17	86.2	63.1
June 18	86.4	63.3
June 19	86.6	63.5
June 20	86.8	63.8
June 21	86.9	64.0
June 22	87.1	64.1
June 23	87.2	64.2
June 24	87.4	64.4
June 25	87.6	64.6
June 26	87.7	64.7
June 27	87.7	64.8
June 28	87.8	64.8
June 29	87.9	65.0
June 30	88.0	65.1
July 1	88.0	65.2
July 2	88.1	65.2
July 3	88.2	65.3
July 4	88.3	65.5
July 5	88.4	65.6
July 6	88.4	65.7
July 7	88.5	65.9
July 8	88.5	65.9
July 9	88.6	66.0
July 10	88.6	66.0
July 11	88.6	66.1
July 12	88.6	66.2
July 13	88.6	66.2
July 14	88.6	66.3
July 15	88.6	66.3
July 16	88.6	66.3
July 17	88.6	66.3
July 18	88.7	66.3
July 19	88.7	66.2
July 20	88.8	66.2
July 21	88.8	66.3
July 22	88.7	66.2
July 23	88.6	66.2
July 24	88.5	66.1
July 25	88.5	66.0
July 26	88.5	66.0
July 27	88.5	66.0
July 28	88.5	65.9
July 29	88.4	65.9
July 30	88.3	65.8
July 31	88.2	65.7
August 1	88.1	65.5
August 2	88.0	65.4
August 3	87.9	65.2
August 4	87.8	65.1
August 5	87.7	65.0
August 6	87.6	64.9
August 7	87.6	64.7
August 8	87.6	64.7
August 9	87.6	64.6
August 10	87.5	64.5
August 11	87.6	64.4
August 12	87.6	64.4
August 13	87.7	64.3
August 14	87.8	64.3
August 15	87.8	64.3
August 16	87.7	64.3
August 17	87.6	64.3
August 18	87.5	64.2
August 19	87.4	64.1
August 20	87.4	64.0
August 21	87.3	63.9
August 22	87.3	63.7
August 23	87.2	63.5
August 24	87.1	63.3
August 25	86.9	63.2
August 26	86.7	63.0
August 27	86.6	62.8
August 28	86.5	62.6
August 29	86.4	62.4
August 30	86.3	62.2
August 31	86.1	62.0
September 1	85.9	61.7
September 2	85.6	61.4
September 3	85.4	61.1
September 4	85.3	60.8
September 5	85.1	60.6
September 6	84.9	60.3
September 7	84.6	60.0
September 8	84.3	59.7
September 9	83.9	59.3
September 10	83.6	58.9
September 11	83.2	58.5
September 12	82.8	58.2
September 13	82.4	57.7
September 14	82.1	57.3
September 15	81.7	56.7
September 16	81.3	56.2
September 17	81.0	55.8
September 18	80.7	55.4
September 19	80.4	55.1
September 20	80.1	54.8
September 21	79.8	54.4
September 22	79.4	54.0
September 23	79.1	53.6
September 24	78.8	53.2
September 25	78.5	52.9
September 26	78.1	52.6
September 27	77.7	52.2
September 28	77.3	51.9
September 29	77.0	51.5
September 30	76.6	51.2
October 1	76.3	50.8
October 2	75.8	50.4
October 3	75.3	49.9
October 4	74.8	49.5
October 5	74.3	49.1
October 6	73.9	48.6
October 7	73.5	48.3
October 8	73.2	48.0
October 9	72.9	47.7
October 10	72.4	47.4
October 11	72.0	47.0
October 12	71.6	46.7
October 13	71.0	46.4
October 14	70.5	46.2
October 15	70.0	45.9
October 16	69.6	45.6
October 17	69.1	45.3
October 18	68.6	44.9
October 19	68.0	44.4
October 20	67.4	44.1
October 21	66.9	43.7
October 22	66.4	43.4
October 23	65.8	43.1
October 24	65.3	42.7
October 25	64.8	42.3
October 26	64.4	42.0
October 27	63.9	41.6
October 28	63.4	41.2
October 29	62.8	40.8
October 30	62.2	40.4
October 31	61.7	40.0
November 1	61.2	39.7
November 2	60.7	39.4
November 3	60.3	39.1
November 4	59.9	38.8
November 5	59.5	38.6
November 6	59.0	38.3
November 7	58.5	37.9
November 8	58.0	37.5
November 9	57.7	37.2
November 10	57.2	36.8
November 11	56.9	36.4
November 12	56.5	36.1
November 13	56.0	35.8
November 14	55.6	35.4
November 15	55.2	35.1
November 16	54.8	34.9
November 17	54.4	34.6
November 18	54.1	34.3
November 19	53.7	34.1
November 20	53.3	33.9
November 21	52.9	33.5
November 22	52.4	33.2
November 23	51.8	32.8
November 24	51.3	32.5
November 25	50.8	32.2
November 26	50.3	31.8
November 27	50.1	31.6
November 28	49.7	31.4
November 29	49.4	31.2
November 30	49.2	31.1
December 1	48.9	31.0
December 2	48.5	30.8
December 3	48.1	30.5
December 4	47.6	30.1
December 5	47.2	29.8
December 6	46.8	29.5
December 7	46.5	29.3
December 8	46.2	29.2
December 9	45.9	29.0
December 10	45.5	28.7
December 11	45.1	28.4
December 12	44.8	28.1
December 13	44.5	28.0
December 14	44.3	27.7
December 15	44.0	27.5
December 16	43.8	27.5
December 17	43.6	27.4
December 18	43.3	27.1
December 19	43.1	26.9
December 20	42.9	26.8
December 21	42.8	26.6
December 22	42.7	26.5
December 23	42.5	26.4
December 24	42.3	26.2
December 25	42.1	26.2
December 26	41.9	26.1
December 27	41.8	26.0
December 28	41.8	25.9
December 29	41.8	25.8
December 30	41.6	25.5
December 31	41.4	25.3

Weather Station Details

Years	Station	Coordinates
1895–2024	Fairfield Radio WFIW	location