Olney Average Weather by Day

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

Also see:

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

On average, July 14 is the hottest day of the year Olney, Illinois. From 1991–2020, the average high temperature on July 14 was 87.6 °F and the average low was 66.3 °F.

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

On average, January 18 is the coldest day of the year Olney, Illinois. From 1991–2020, the average high temperature on January 18 was 38.3 °F, and the average low was 21.6 °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	39.9	23.4
January 2	39.7	23.3
January 3	39.6	23.2
January 4	39.5	23.0
January 5	39.3	22.8
January 6	39.1	22.6
January 7	38.9	22.4
January 8	38.8	22.4
January 9	38.9	22.5
January 10	38.9	22.5
January 11	38.8	22.4
January 12	38.6	22.2
January 13	38.5	22.1
January 14	38.5	22.0
January 15	38.4	21.9
January 16	38.3	21.8
January 17	38.3	21.7
January 18	38.3	21.6
January 19	38.3	21.6
January 20	38.4	21.6
January 21	38.6	21.7
January 22	38.8	21.7
January 23	38.9	21.8
January 24	39.0	21.8
January 25	39.1	21.9
January 26	39.1	21.9
January 27	39.1	21.8
January 28	39.0	21.9
January 29	39.2	22.0
January 30	39.4	22.2
January 31	39.6	22.3
February 1	39.8	22.3
February 2	39.9	22.5
February 3	40.1	22.7
February 4	40.4	22.9
February 5	40.7	23.1
February 6	41.0	23.3
February 7	41.4	23.5
February 8	41.7	23.7
February 9	42.0	24.0
February 10	42.3	24.3
February 11	42.6	24.5
February 12	42.8	24.7
February 13	43.1	24.9
February 14	43.4	25.0
February 15	43.8	25.4
February 16	44.1	25.6
February 17	44.3	25.8
February 18	44.5	26.0
February 19	44.7	26.2
February 20	45.0	26.4
February 21	45.4	26.7
February 22	45.7	26.9
February 23	46.1	27.2
February 24	46.5	27.4
February 25	46.7	27.6
February 26	47.1	27.8
February 27	47.5	28.1
February 28	48.0	28.4
March 1	48.4	28.7
March 2	48.9	29.1
March 3	49.4	29.4
March 4	49.8	29.8
March 5	50.2	30.2
March 6	50.6	30.6
March 7	50.9	30.9
March 8	51.1	31.1
March 9	51.4	31.3
March 10	51.8	31.6
March 11	52.2	31.8
March 12	52.5	32.1
March 13	52.9	32.3
March 14	53.3	32.7
March 15	53.7	33.1
March 16	54.0	33.4
March 17	54.4	33.6
March 18	54.9	34.0
March 19	55.5	34.4
March 20	56.1	34.8
March 21	56.5	35.2
March 22	56.8	35.5
March 23	57.2	35.7
March 24	57.5	36.0
March 25	58.0	36.4
March 26	58.5	36.8
March 27	58.9	37.2
March 28	59.4	37.6
March 29	59.9	38.0
March 30	60.2	38.3
March 31	60.6	38.6
April 1	61.0	39.0
April 2	61.4	39.3
April 3	61.8	39.6
April 4	62.3	39.9
April 5	62.8	40.3
April 6	63.2	40.7
April 7	63.6	41.0
April 8	63.9	41.3
April 9	64.2	41.6
April 10	64.7	41.9
April 11	65.1	42.2
April 12	65.4	42.6
April 13	65.7	42.8
April 14	66.0	43.1
April 15	66.2	43.4
April 16	66.5	43.8
April 17	66.9	44.2
April 18	67.1	44.6
April 19	67.4	44.9
April 20	67.7	45.3
April 21	68.1	45.7
April 22	68.5	46.0
April 23	68.8	46.3
April 24	69.2	46.7
April 25	69.6	47.1
April 26	69.9	47.5
April 27	70.2	47.8
April 28	70.5	48.3
April 29	70.8	48.5
April 30	70.9	48.7
May 1	71.1	48.9
May 2	71.4	49.2
May 3	71.6	49.6
May 4	71.7	49.9
May 5	71.9	50.1
May 6	72.2	50.3
May 7	72.5	50.7
May 8	72.8	51.0
May 9	73.2	51.3
May 10	73.6	51.7
May 11	73.9	52.1
May 12	74.2	52.5
May 13	74.6	52.9
May 14	75.0	53.3
May 15	75.4	53.7
May 16	75.7	54.0
May 17	76.1	54.4
May 18	76.5	54.7
May 19	76.8	55.1
May 20	77.1	55.4
May 21	77.3	55.8
May 22	77.5	56.0
May 23	77.7	56.1
May 24	77.9	56.4
May 25	78.2	56.7
May 26	78.4	56.9
May 27	78.7	57.2
May 28	79.1	57.7
May 29	79.6	58.1
May 30	80.0	58.6
May 31	80.4	58.9
June 1	80.7	59.2
June 2	81.0	59.4
June 3	81.4	59.7
June 4	81.8	60.1
June 5	82.2	60.5
June 6	82.5	60.8
June 7	82.8	61.1
June 8	83.0	61.4
June 9	83.3	61.7
June 10	83.6	61.9
June 11	83.8	62.2
June 12	84.0	62.4
June 13	84.2	62.5
June 14	84.3	62.7
June 15	84.5	62.8
June 16	84.7	63.0
June 17	84.9	63.2
June 18	85.2	63.4
June 19	85.4	63.6
June 20	85.6	63.8
June 21	85.8	64.1
June 22	86.0	64.3
June 23	86.1	64.4
June 24	86.4	64.6
June 25	86.5	64.7
June 26	86.7	64.8
June 27	86.8	64.9
June 28	86.8	65.0
June 29	86.9	65.1
June 30	87.0	65.2
July 1	87.0	65.3
July 2	87.1	65.4
July 3	87.1	65.4
July 4	87.2	65.5
July 5	87.2	65.6
July 6	87.3	65.8
July 7	87.4	65.9
July 8	87.4	66.0
July 9	87.5	66.0
July 10	87.5	66.1
July 11	87.5	66.1
July 12	87.6	66.2
July 13	87.6	66.2
July 14	87.6	66.3
July 15	87.5	66.3
July 16	87.5	66.3
July 17	87.5	66.3
July 18	87.5	66.3
July 19	87.6	66.3
July 20	87.6	66.2
July 21	87.6	66.2
July 22	87.5	66.2
July 23	87.4	66.1
July 24	87.3	66.0
July 25	87.2	66.0
July 26	87.2	66.0
July 27	87.2	65.9
July 28	87.2	65.9
July 29	87.1	65.8
July 30	87.1	65.7
July 31	87.0	65.6
August 1	86.9	65.5
August 2	86.8	65.4
August 3	86.8	65.2
August 4	86.7	65.1
August 5	86.6	65.0
August 6	86.5	64.8
August 7	86.4	64.6
August 8	86.4	64.5
August 9	86.4	64.5
August 10	86.4	64.4
August 11	86.3	64.3
August 12	86.3	64.2
August 13	86.4	64.2
August 14	86.4	64.2
August 15	86.5	64.2
August 16	86.4	64.1
August 17	86.3	64.1
August 18	86.2	64.1
August 19	86.1	64.0
August 20	86.1	63.9
August 21	86.1	63.8
August 22	86.0	63.6
August 23	86.0	63.4
August 24	85.9	63.2
August 25	85.8	63.0
August 26	85.7	62.9
August 27	85.5	62.7
August 28	85.4	62.5
August 29	85.3	62.3
August 30	85.2	62.2
August 31	85.1	62.0
September 1	84.9	61.7
September 2	84.6	61.4
September 3	84.4	61.1
September 4	84.2	60.8
September 5	84.1	60.6
September 6	83.9	60.3
September 7	83.6	60.1
September 8	83.4	59.7
September 9	83.1	59.4
September 10	82.8	59.0
September 11	82.4	58.5
September 12	82.1	58.1
September 13	81.7	57.7
September 14	81.5	57.3
September 15	81.2	56.8
September 16	80.8	56.3
September 17	80.5	55.8
September 18	80.3	55.4
September 19	79.9	55.1
September 20	79.6	54.8
September 21	79.2	54.4
September 22	78.9	53.9
September 23	78.5	53.5
September 24	78.2	53.1
September 25	77.9	52.7
September 26	77.5	52.4
September 27	77.2	52.0
September 28	76.8	51.7
September 29	76.4	51.3
September 30	76.0	50.9
October 1	75.7	50.5
October 2	75.3	50.1
October 3	74.8	49.6
October 4	74.3	49.2
October 5	73.9	48.7
October 6	73.4	48.2
October 7	72.9	47.8
October 8	72.6	47.5
October 9	72.3	47.1
October 10	71.9	46.9
October 11	71.5	46.5
October 12	71.0	46.2
October 13	70.5	45.9
October 14	69.9	45.6
October 15	69.4	45.3
October 16	68.9	45.0
October 17	68.5	44.7
October 18	68.0	44.4
October 19	67.5	43.9
October 20	66.9	43.4
October 21	66.4	43.1
October 22	65.9	42.8
October 23	65.4	42.5
October 24	64.9	42.1
October 25	64.3	41.6
October 26	63.9	41.2
October 27	63.4	40.9
October 28	63.0	40.5
October 29	62.4	40.1
October 30	61.9	39.7
October 31	61.3	39.3
November 1	60.9	39.0
November 2	60.4	38.7
November 3	59.9	38.4
November 4	59.5	38.1
November 5	59.1	37.9
November 6	58.6	37.5
November 7	58.0	37.2
November 8	57.5	36.7
November 9	57.1	36.4
November 10	56.7	36.0
November 11	56.3	35.6
November 12	55.9	35.3
November 13	55.5	35.0
November 14	55.1	34.7
November 15	54.5	34.4
November 16	54.2	34.1
November 17	53.8	33.9
November 18	53.4	33.6
November 19	53.0	33.4
November 20	52.6	33.2
November 21	52.2	32.8
November 22	51.7	32.5
November 23	51.2	32.2
November 24	50.6	31.8
November 25	50.0	31.5
November 26	49.5	31.1
November 27	49.1	30.9
November 28	48.8	30.7
November 29	48.5	30.5
November 30	48.2	30.4
December 1	47.9	30.2
December 2	47.6	30.1
December 3	47.2	29.8
December 4	46.7	29.5
December 5	46.2	29.2
December 6	45.8	28.9
December 7	45.5	28.6
December 8	45.2	28.4
December 9	44.9	28.2
December 10	44.5	27.9
December 11	44.1	27.5
December 12	43.7	27.2
December 13	43.4	26.9
December 14	43.2	26.7
December 15	42.9	26.5
December 16	42.6	26.3
December 17	42.4	26.2
December 18	42.2	26.0
December 19	41.9	25.7
December 20	41.7	25.5
December 21	41.6	25.3
December 22	41.4	25.2
December 23	41.3	25.0
December 24	41.1	24.8
December 25	40.8	24.7
December 26	40.7	24.6
December 27	40.5	24.4
December 28	40.5	24.3
December 29	40.4	24.2
December 30	40.4	24.0
December 31	40.1	23.7

Weather Station Details

Years	Station	Coordinates
1893–2024	Olney 2S	location