Rockford Weather in 1940

Historical record of Rockford, Illinois weather for the year 1940 based on NOAA data.

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1940 Rockford Weather Extremes
Highest temperature	104 °F	July 25
Lowest temperature	-20 °F	January 18
Highest daily low	76 °F	July 25
Lowest daily high	-1 °F	January 18
Most daily precipitation	3.4 inches	June 18
Most daily snow	7.0 inches	January 14
Total annual precipitation	41.3 inches	-
Total annual snow	36.5 inches	-

What was the hottest temperature in Rockford in 1940?

The highest temperature recorded in Rockford, Illinois in 1940 was 104 °F which happened on July 25.

Highest Temperatures: All-Time By Year

Highest Temperatures in Rockford in 1940

Rank	Temperature	Date
1	104 °F	Jul 25
2	100 °F	Jul 24
2	100 °F	Jul 23
4	98 °F	Jul 22
5	96 °F	Jul 26
5	96 °F	Jul 21
5	96 °F	Jul 19
8	95 °F	Jul 10
9	94 °F	Aug 12
9	94 °F	Jul 20
9	94 °F	Jun 6

What was the coldest temperature in Rockford in 1940?

The lowest temperature recorded in Rockford, Illinois in 1940 was -20 °F which happened on Jan 18.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in Rockford in 1940

Rank	Temperature	Date
1	-20 °F	January 18
2	-15 °F	January 19
3	-14 °F	December 3
4	-9 °F	January 25
5	-7 °F	February 25
5	-7 °F	January 26
7	-6 °F	January 28
7	-6 °F	January 5
9	-2 °F	January 23
9	-2 °F	January 17

January 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
January 1	16	4	0.00	0.0
January 2	20	1	0.00	0.0
January 3	17	2	0.00	0.0
January 4	16	6	0.00	0.0
January 5	23	-6	0.00	0.0
January 6	27	0	0.00	0.0
January 7	20	12	0.10	1.6
January 8	29	18	0.00	0.0
January 9	26	19	0.00	0.0
January 10	30	22	0.00	0.0
January 11	34	28	0.30	2.5
January 12	34	16	0.00	0.0
January 13	31	10	0.00	0.0
January 14	30	28	1.20	7.0
January 15	28	8	0.00	0.0
January 16	16	0	0.00	0.0
January 17	4	-2	0.24	1.2
January 18	-1	-20	0.00	0.0
January 19	9	-15	0.00	0.0
January 20	12	2	0.00	0.0
January 21	15	2	0.00	0.0
January 22	16	3	0.00	0.0
January 23	16	-2	0.00	0.0
January 24	14	1	0.00	0.0
January 25	3	-9	0.00	0.0
January 26	9	-7	0.00	0.0
January 27	11	-1	0.00	0.0
January 28	24	-6	0.00	0.0
January 29	26	16	0.00	0.0
January 30	27	21	0.00	0.0
January 31	33	25	0.00	0.0

February 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
February 1	39	28	0.00	0.0
February 2	32	9	0.00	0.0
February 3	33	4	0.00	0.0
February 4	34	27	0.33	2.0
February 5	33	27	0.00	0.0
February 6	32	26	0.00	0.0
February 7	27	21	0.00	0.0
February 8	28	21	0.55	4.0
February 9	26	14	0.10	0.5
February 10	31	14	0.00	0.0
February 11	41	11	0.00	0.0
February 12	38	31	0.00	0.0
February 13	31	18	0.00	0.0
February 14	30	11	0.00	0.0
February 15	41	18	0.00	0.0
February 16	38	30	0.00	0.0
February 17	40	26	0.00	0.0
February 18	37	30	0.00	0.0
February 19	34	32	0.00	0.0
February 20	34	29	0.00	0.0
February 21	37	27	0.00	0.0
February 22	32	14	0.00	0.0
February 23	31	13	0.40	2.5
February 24	32	17	0.50	3.5
February 25	18	-7	0.00	0.0
February 26	32	7	0.00	0.0
February 27	40	30	0.00	0.0
February 28	34	29	0.00	0.0
February 29	36	25	0.00	0.0

March 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
March 1	37	28	0.00	0.0
March 2	35	30	0.50	0.5
March 3	34	32	0.10	0.0
March 4	34	29	0.00	0.0
March 5	34	30	0.00	0.0
March 6	37	20	0.00	0.0
March 7	37	20	0.00	0.0
March 8	37	18	0.00	0.0
March 9	36	17	0.00	0.0
March 10	34	18	0.00	0.0
March 11	32	16	0.00	0.0
March 12	28	21	0.00	0.0
March 13	31	24	0.05	0.5
March 14	26	16	0.00	0.0
March 15	33	15	0.00	0.0
March 16	44	20	0.00	0.0
March 17	59	33	0.00	0.0
March 18	46	31	0.20	0.0
March 19	46	29	0.00	0.0
March 20	42	25	0.00	0.0
March 21	32	21	0.32	1.5
March 22	21	11	0.00	0.0
March 23	23	8	0.00	0.0
March 24	26	8	0.00	0.0
March 25	33	9	0.00	0.0
March 26	34	24	0.00	0.0
March 27	39	29	0.15	0.5
March 28	45	32	0.20	0.0
March 29	63	41	0.00	0.0
March 30	72	35	0.00	0.0
March 31	65	35	0.00	0.0

April 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
April 1	54	33	0.00	0.0
April 2	55	35	0.35	0.0
April 3	75	39	0.32	0.0
April 4	45	39	0.00	0.0
April 5	53	30	0.00	0.0
April 6	58	27	0.00	0.0
April 7	53	40	0.40	0.0
April 8	47	40	0.10	0.0
April 9	59	35	0.00	0.0
April 10	55	39	0.45	0.0
April 11	49	32	0.10	0.0
April 12	37	20	0.00	0.0
April 13	44	26	0.00	0.0
April 14	64	26	0.00	0.0
April 15	75	45	0.10	0.0
April 16	61	37	0.00	0.0
April 17	50	34	0.80	0.5
April 18	52	32	0.18	0.0
April 19	60	29	0.00	0.0
April 20	65	31	0.00	0.0
April 21	65	29	0.00	0.0
April 22	69	35	0.00	0.0
April 23	63	44	0.00	0.0
April 24	60	41	0.00	0.0
April 25	57	32	0.00	0.0
April 26	59	32	0.00	0.0
April 27	67	30	0.00	0.0
April 28	75	43	0.00	0.0
April 29	75	55	0.70	0.0
April 30	64	49	0.15	0.0

May 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
May 1	49	32	0.60	1.5
May 2	42	32	0.10	0.0
May 3	55	33	0.00	0.0
May 4	63	29	0.00	0.0
May 5	78	48	0.10	0.0
May 6	76	60	0.00	0.0
May 7	69	50	0.05	0.0
May 8	64	43	0.00	0.0
May 9	69	40	0.00	0.0
May 10	62	44	0.15	0.0
May 11	72	33	0.00	0.0
May 12	82	49	0.00	0.0
May 13	88	61	0.00	0.0
May 14	84	60	0.14	0.0
May 15	63	41	0.02	0.0
May 16	52	34	0.08	0.0
May 17	71	39	0.00	0.0
May 18	69	44	0.00	0.0
May 19	67	51	0.65	0.0
May 20	76	41	0.00	0.0
May 21	74	56	1.70	0.0
May 22	75	54	0.00	0.0
May 23	76	48	0.00	0.0
May 24	71	46	0.00	0.0
May 25	71	48	0.00	0.0
May 26	61	49	0.35	0.0
May 27	65	50	0.10	0.0
May 28	59	47	0.00	0.0
May 29	73	49	0.00	0.0
May 30	76	49	0.00	0.0
May 31	78	51	0.00	0.0

June 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)
June 1	81	50	0.00
June 2	90	56	0.00
June 3	91	66	0.00
June 4	86	64	0.00
June 5	91	68	0.00
June 6	94	60	0.00
June 7	87	67	0.23
June 8	85	64	0.20
June 9	83	58	0.00
June 10	79	62	0.17
June 11	75	61	0.06
June 12	76	56	1.20
June 13	83	61	0.00
June 14	82	50	0.00
June 15	86	66	0.00
June 16	90	56	0.00
June 17	92	68	0.00
June 18	84	66	3.35
June 19	74	56	0.00
June 20	70	47	0.00
June 21	73	44	0.00
June 22	82	57	0.44
June 23	82	66	2.32
June 24	77	60	0.00
June 25	75	56	0.00
June 26	77	53	0.00
June 27	82	51	0.00
June 28	79	60	1.50
June 29	76	53	0.00
June 30	81	58	0.00

July 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)
July 1	81	54	0.00
July 2	76	48	0.00
July 3	78	52	0.00
July 4	84	48	0.00
July 5	89	56	0.00
July 6	89	60	0.00
July 7	89	61	0.00
July 8	90	66	0.00
July 9	85	65	0.00
July 10	95	69	0.00
July 11	87	62	1.10
July 12	74	53	0.00
July 13	78	47	0.00
July 14	84	52	0.00
July 15	85	66	0.00
July 16	86	58	0.00
July 17	82	50	0.00
July 18	83	61	0.00
July 19	96	68	0.00
July 20	94	70	0.00
July 21	96	70	0.00
July 22	98	70	0.00
July 23	100	72	0.00
July 24	100	74	0.00
July 25	104	76	0.63
July 26	96	68	1.10
July 27	89	66	0.28
July 28	92	70	0.30
July 29	87	75	0.00
July 30	87	69	1.15
July 31	86	64	0.00

August 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)
August 1	87	64	0.00
August 2	92	68	0.00
August 3	88	73	0.14
August 4	90	70	0.00
August 5	92	70	0.00
August 6	83	59	0.00
August 7	82	52	0.00
August 8	88	58	0.00
August 9	85	65	0.18
August 10	79	67	0.00
August 11	87	68	0.00
August 12	94	68	1.10
August 13	90	68	0.51
August 14	83	68	1.18
August 15	89	67	0.22
August 16	87	68	0.00
August 17	84	69	0.00
August 18	83	60	1.12
August 19	71	53	0.00
August 20	73	47	0.00
August 21	77	49	0.00
August 22	77	61	0.10
August 23	71	47	0.00
August 24	63	52	0.30
August 25	76	53	0.70
August 26	76	61	1.10
August 27	76	61	0.60
August 28	82	64	0.60
August 29	80	63	0.00
August 30	81	54	0.00
August 31	74	60	0.10

September 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)
September 1	71	51	0.00
September 2	77	49	0.00
September 3	83	52	0.00
September 4	84	55	0.00
September 5	87	56	0.00
September 6	87	58	0.00
September 7	89	66	0.09
September 8	79	65	0.00
September 9	77	59	0.10
September 10	63	45	0.00
September 11	63	38	0.00
September 12	69	40	0.00
September 13	77	45	0.00
September 14	72	47	0.00
September 15	70	43	0.00
September 16	76	45	0.00
September 17	81	51	0.00
September 18	87	62	0.00
September 19	90	67	0.00
September 20	91	60	0.00
September 21	89	61	0.00
September 22	83	54	0.00
September 23	70	58	0.00
September 24	69	54	0.18
September 25	59	35	0.00
September 26	69	32	0.00
September 27	71	37	0.00
September 28	76	38	0.00
September 29	78	46	0.00
September 30	73	44	0.00

October 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)
October 1	70	45	0.00
October 2	79	39	0.00
October 3	80	43	0.00
October 4	75	54	0.00
October 5	86	52	0.00
October 6	74	54	0.70
October 7	65	43	0.00
October 8	65	36	0.00
October 9	70	36	0.00
October 10	72	42	0.00
October 11	70	54	0.10
October 12	82	51	0.00
October 13	75	44	0.00
October 14	57	48	0.00
October 15	55	36	0.88
October 16	56	29	0.00
October 17	61	38	0.00
October 18	50	35	0.00
October 19	61	39	0.00
October 20	61	39	0.00
October 21	63	42	0.00
October 22	76	43	0.00
October 23	70	49	0.00
October 24	67	39	0.00
October 25	58	47	0.64
October 26	62	46	0.00
October 27	83	42	0.00
October 28	64	50	0.15
October 29	60	43	0.66
October 30	65	36	0.00
October 31	67	37	0.00

November 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
November 1	58	37	0.15	0.0
November 2	61	39	0.00	0.0
November 3	70	32	0.00	0.0
November 4	60	48	0.00	0.0
November 5	59	43	0.00	0.0
November 6	45	33	0.00	0.0
November 7	48	24	0.00	0.0
November 8	47	24	0.00	0.0
November 9	45	39	0.15	0.0
November 10	47	39	0.15	0.0
November 11	55	19	0.55	0.0
November 12	27	12	0.00	0.0
November 13	20	7	0.00	0.0
November 14	26	8	0.00	0.0
November 15	30	12	0.00	0.0
November 16	40	22	0.00	0.0
November 17	54	30	0.00	0.0
November 18	48	21	0.00	0.0
November 19	59	37	0.00	0.0
November 20	52	32	0.15	0.0
November 21	51	32	0.08	0.0
November 22	45	34	0.00	0.0
November 23	43	34	0.10	0.0
November 24	44	29	0.00	0.0
November 25	42	21	0.00	0.0
November 26	32	28	0.40	2.0
November 27	30	17	0.05	0.5
November 28	26	3	0.45	2.2
November 29	36	15	0.00	0.0
November 30	35	21	0.00	0.0

December 1940 Rockford Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
December 1	27	14	0.00	0.0
December 2	19	6	0.16	1.0
December 3	6	-14	0.00	0.0
December 4	31	5	0.00	0.0
December 5	27	6	0.00	0.0
December 6	44	20	0.00	0.0
December 7	42	24	0.00	0.0
December 8	41	22	0.00	0.0
December 9	52	27	0.00	0.0
December 10	46	28	0.00	0.0
December 11	32	24	0.00	0.0
December 12	31	27	0.10	0.5
December 13	28	10	0.00	0.0
December 14	24	9	0.00	0.0
December 15	35	18	n/a	0.0
December 16	37	27	n/a	0.0
December 17	33	26	0.00	0.0
December 18	35	26	0.00	0.0
December 19	35	32	0.15	0.0
December 20	36	32	0.00	0.0
December 21	38	21	0.00	0.0
December 22	47	28	0.00	0.0
December 23	36	32	0.00	0.0
December 24	46	31	0.00	0.0
December 25	48	43	0.10	0.0
December 26	47	35	0.00	0.0
December 27	37	34	0.00	0.0
December 28	38	32	0.00	0.0
December 29	37	32	0.00	0.0
December 30	36	32	0.00	0.0
December 31	36	31	0.15	0.5

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Weather Station Details

Years	Station	Coordinates
1951–2024	Greater Rockford Airport	location
1893–1950	Rockford	location