Mackinaw 3WSW Weather Records (USC00115272)

Record envelope, standing records and threshold days for Mackinaw 3WSW (USC00115272), Illinois, United States, with 87 years of record.

Key Facts for Mackinaw 3WSW

Mackinaw 3WSW (USC00115272) is a weather station in Illinois, United States at 40.52 latitude and -89.42 longitude, 202 m (662 ft) above sea level.
The station reports from 1940 to 2026, 87 years of record.
1,464 records set at Mackinaw 3WSW still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Mackinaw 3WSW set a monthly record daily precipitation of 119.4 mm (4.7 in) on 15 August 2026.

About the Station

Location: Illinois, United States, 40.52 latitude, -89.42 longitude.
Elevation: 202 m (662 ft).
Period of record: 1940 to 2026, 87 years.
Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Mackinaw 3WSW. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Mackinaw 3WSW, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	17.8 C (64.0 F)	-25.6 C (-14.1 F)	n/a	n/a
Feb	17.8 C (64.0 F)	-23.3 C (-9.9 F)	n/a	n/a
Mar	27.2 C (81.0 F)	-25.6 C (-14.1 F)	n/a	n/a
Apr	25.6 C (78.1 F)	-6.7 C (19.9 F)	n/a	n/a
May	34.4 C (93.9 F)	-1.7 C (28.9 F)	n/a	n/a
Jun	38.3 C (100.9 F)	4.4 C (39.9 F)	n/a	n/a
Jul	36.7 C (98.1 F)	7.2 C (45.0 F)	n/a	n/a
Aug	37.8 C (100.0 F)	6.7 C (44.1 F)	n/a	n/a
Sep	34.4 C (93.9 F)	-2.2 C (28.0 F)	n/a	n/a
Oct	30.0 C (86.0 F)	-6.7 C (19.9 F)	n/a	n/a
Nov	24.4 C (75.9 F)	-12.8 C (9.0 F)	n/a	n/a
Dec	15.6 C (60.1 F)	-21.1 C (-6.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Mackinaw 3WSW still stand. 1943 holds the most, with 582.

All-Time Record Progression

5 new records

5 all-time records were set at Mackinaw 3WSW between 19 December 1973 and 2 February 2011. Each dot is a new record.

When Mackinaw 3WSW set new all-time records
Date	Kind	Detail
1973-12-19	Record daily snowfall	Record daily snowfall 27.9 cm (11.0 in)
1979-01-13	Record snow depth	Record snow depth 43.2 cm (17.0 in)
1979-01-14	Record snow depth	Record snow depth 48.3 cm (19.0 in)
1986-09-20	Record daily precipitation	Record daily precipitation 152.4 mm (6.0 in)
2011-02-02	Record daily snowfall	Record daily snowfall 34.5 cm (13.6 in)

Wettest Day of Each Month

Sep: 152.4 mm (6.0 in)

The wettest day on record for each calendar month at Mackinaw 3WSW. The most was 152.4 mm (6.0 in) on 20 September 1986.

Record daily precipitation for each month at Mackinaw 3WSW
Month	Record daily precipitation (mm)	Date
Jan	89.7 mm (3.5 in)	1 January 1965
Feb	53.8 mm (2.1 in)	10 February 1960
Mar	58.4 mm (2.3 in)	5 March 1964
Apr	79.8 mm (3.1 in)	24 April 1950
May	72.6 mm (2.9 in)	20 May 1984
Jun	101.1 mm (4.0 in)	2 June 1980
Jul	127.3 mm (5.0 in)	9 July 2003
Aug	119.4 mm (4.7 in)	15 August 2026
Sep	152.4 mm (6.0 in)	20 September 1986
Oct	109.2 mm (4.3 in)	3 October 1986
Nov	63.8 mm (2.5 in)	27 November 1990
Dec	97.5 mm (3.8 in)	21 December 1949

Period of Record Coverage

1942 to 1945

4 years of record at Mackinaw 3WSW, 1942 to 1945. 2 years have data for under 90 percent of days and are left out of rankings: 1942, 1945.

Latest Records

Latest records at Mackinaw 3WSW
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 August 2026	Mackinaw 3WSW, US	monthly rain	119.4 mm (4.7 in)	13.2 mm (0.5 in)	83 years	51 of 100 (Notable)
14 August 2026	Mackinaw 3WSW, US	daily rain	54.6 mm (2.1 in)	17.5 mm (0.7 in)	45 years	33 of 100 (Routine)
4 July 2026	Mackinaw 3WSW, US	daily rain	46.7 mm (1.8 in)	21.0 mm (0.8 in)	44 years	35 of 100 (Notable)
28 April 2026	Mackinaw 3WSW, US	daily rain	44.5 mm (1.8 in)	14.5 mm (0.6 in)	16 years	25 of 100 (Routine)
9 January 2026	Mackinaw 3WSW, US	daily rain	41.1 mm (1.6 in)	17.5 mm (0.7 in)	80 years	50 of 100 (Notable)
12 December 2025	Mackinaw 3WSW, US	daily snowfall (Tie)	7.6 cm (3.0 in)	tie	52 years	5 of 100 (Routine)
3 December 2025	Mackinaw 3WSW, US	daily snow depth	15.2 cm (6.0 in)	2.5 cm (1.0 in)	60 years	29 of 100 (Routine)
2 December 2025	Mackinaw 3WSW, US	daily snow depth	15.2 cm (6.0 in)	2.5 cm (1.0 in)	60 years	29 of 100 (Routine)
30 November 2025	Mackinaw 3WSW, US	daily snow depth	15.2 cm (6.0 in)	5.0 cm (2.0 in)	48 years	33 of 100 (Routine)
30 November 2025	Mackinaw 3WSW, US	daily snowfall	15.2 cm (6.0 in)	7.6 cm (3.0 in)	19 years	32 of 100 (Routine)
4 June 2025	Mackinaw 3WSW, US	daily rain	57.2 mm (2.3 in)	24.2 mm (1.0 in)	16 years	29 of 100 (Routine)
4 March 2025	Mackinaw 3WSW, US	daily rain	40.6 mm (1.6 in)	4.5 mm (0.18 in)	62 years	31 of 100 (Routine)
29 April 2024	Mackinaw 3WSW, US	daily rain	45.0 mm (1.8 in)	9.9 mm (0.39 in)	4 years	17 of 100 (Routine)
17 February 2024	Mackinaw 3WSW, US	daily snowfall (Tie)	5.1 cm (2.0 in)	tie	16 years	3 of 100 (Routine)
7 May 2023	Mackinaw 3WSW, US	daily rain	58.4 mm (2.3 in)	18.8 mm (0.7 in)	44 years	37 of 100 (Notable)
17 November 2022	Mackinaw 3WSW, US	daily snowfall	1.3 cm (0.5 in)	1.3 cm (0.5 in)	81 years	20 of 100 (Routine)
15 November 2022	Mackinaw 3WSW, US	daily snowfall (Tie)	2.5 cm (1.0 in)	tie	24 years	3 of 100 (Routine)
21 August 2022	Mackinaw 3WSW, US	daily rain	37.1 mm (1.5 in)	3.8 mm (0.15 in)	57 years	27 of 100 (Routine)
2 August 2022	Mackinaw 3WSW, US	daily rain	55.9 mm (2.2 in)	29.5 mm (1.2 in)	40 years	40 of 100 (Notable)
18 February 2022	Mackinaw 3WSW, US	daily snowfall	22.9 cm (9.0 in)	17.8 cm (7.0 in)	40 years	58 of 100 (Notable)

Extremes by Year

1940 to 2026

Yearly extremes at Mackinaw 3WSW: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.3 C (100.9 F)	1944	35.6 C (96.0 F)	4
Coldest night (TNn)	-25.6 C (-14.1 F)	1943	-22.2 C (-8.0 F)	4
Wettest day (Rx1day)	152.4 mm (6.0 in)	1986	61.4 mm (2.4 in)	86
Wettest five days (Rx5day)	207.3 mm (8.2 in)	1986	90.2 mm (3.5 in)	86
Longest dry spell (CDD)	38 days	1989	19 days	86

Hottest day (TXx)

The hottest day of the year at Mackinaw 3WSW, 1940 to 2026. The record is 38.3 C (100.9 F) in 1944, marked on the chart; the median year is 35.6 C (96.0 F).

Hottest day (TXx) at Mackinaw 3WSW by year
Year	Hottest day (TXx)
1940	n/a
1941	n/a
1942	34.4 C (93.9 F)
1943	36.7 C (98.1 F)
1944	38.3 C (100.9 F)
1945	27.2 C (81.0 F)
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	n/a
2022	n/a
2023	n/a
2024	n/a
2025	n/a
2026	n/a

Coldest night (TNn)

The coldest night of the year at Mackinaw 3WSW, 1940 to 2026. The record is -25.6 C (-14.1 F) in 1943, marked on the chart; the median year is -22.2 C (-8.0 F).

Coldest night (TNn) at Mackinaw 3WSW by year
Year	Coldest night (TNn)
1940	n/a
1941	n/a
1942	-20.0 C (-4.0 F)
1943	-25.6 C (-14.1 F)
1944	-23.3 C (-9.9 F)
1945	-21.1 C (-6.0 F)
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	n/a
2022	n/a
2023	n/a
2024	n/a
2025	n/a
2026	n/a

Wettest day (Rx1day)

The wettest day of the year at Mackinaw 3WSW, 1940 to 2026. The record is 152.4 mm (6.0 in) in 1986, marked on the chart; the median year is 61.4 mm (2.4 in).

Wettest day (Rx1day) at Mackinaw 3WSW by year
Year	Wettest day (Rx1day)
1940	20.3 mm (0.8 in)
1941	71.9 mm (2.8 in)
1942	53.6 mm (2.1 in)
1943	106.2 mm (4.2 in)
1944	56.1 mm (2.2 in)
1945	55.6 mm (2.2 in)
1946	85.3 mm (3.4 in)
1947	63.5 mm (2.5 in)
1948	79.2 mm (3.1 in)
1949	97.5 mm (3.8 in)
1950	79.8 mm (3.1 in)
1951	84.1 mm (3.3 in)
1952	43.2 mm (1.7 in)
1953	61.0 mm (2.4 in)
1954	47.5 mm (1.9 in)
1955	70.9 mm (2.8 in)
1956	52.3 mm (2.1 in)
1957	68.1 mm (2.7 in)
1958	43.2 mm (1.7 in)
1959	49.8 mm (2.0 in)
1960	56.6 mm (2.2 in)
1961	83.3 mm (3.3 in)
1962	57.4 mm (2.3 in)
1963	47.5 mm (1.9 in)
1964	91.9 mm (3.6 in)
1965	89.7 mm (3.5 in)
1966	52.8 mm (2.1 in)
1967	64.5 mm (2.5 in)
1968	83.8 mm (3.3 in)
1969	65.3 mm (2.6 in)
1970	61.7 mm (2.4 in)
1971	43.2 mm (1.7 in)
1972	92.2 mm (3.6 in)
1973	82.3 mm (3.2 in)
1974	93.0 mm (3.7 in)
1975	82.6 mm (3.3 in)
1976	61.0 mm (2.4 in)
1977	90.2 mm (3.6 in)
1978	58.9 mm (2.3 in)
1979	75.4 mm (3.0 in)
1980	101.1 mm (4.0 in)
1981	55.1 mm (2.2 in)
1982	90.2 mm (3.6 in)
1983	47.8 mm (1.9 in)
1984	72.6 mm (2.9 in)
1985	57.4 mm (2.3 in)
1986	152.4 mm (6.0 in)
1987	27.9 mm (1.1 in)
1988	38.6 mm (1.5 in)
1989	68.6 mm (2.7 in)
1990	63.8 mm (2.5 in)
1991	62.2 mm (2.4 in)
1992	83.3 mm (3.3 in)
1993	127.0 mm (5.0 in)
1994	58.9 mm (2.3 in)
1995	50.3 mm (2.0 in)
1996	33.8 mm (1.3 in)
1997	55.1 mm (2.2 in)
1998	46.2 mm (1.8 in)
2000	21.3 mm (0.8 in)
2001	67.3 mm (2.6 in)
2002	58.4 mm (2.3 in)
2003	127.3 mm (5.0 in)
2004	89.4 mm (3.5 in)
2005	35.3 mm (1.4 in)
2006	45.7 mm (1.8 in)
2007	48.3 mm (1.9 in)
2008	89.4 mm (3.5 in)
2009	56.9 mm (2.2 in)
2010	42.4 mm (1.7 in)
2011	68.6 mm (2.7 in)
2012	60.5 mm (2.4 in)
2013	66.8 mm (2.6 in)
2014	55.9 mm (2.2 in)
2015	85.1 mm (3.4 in)
2016	96.5 mm (3.8 in)
2017	63.0 mm (2.5 in)
2018	0.0 mm (0.00 in)
2019	29.7 mm (1.2 in)
2020	42.7 mm (1.7 in)
2021	68.1 mm (2.7 in)
2022	55.9 mm (2.2 in)
2023	58.4 mm (2.3 in)
2024	45.0 mm (1.8 in)
2025	57.2 mm (2.3 in)
2026	119.4 mm (4.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Mackinaw 3WSW, 1940 to 2026. The record is 207.3 mm (8.2 in) in 1986, marked on the chart; the median year is 90.2 mm (3.5 in).

Wettest five days (Rx5day) at Mackinaw 3WSW by year
Year	Wettest five days (Rx5day)
1940	20.3 mm (0.8 in)
1941	155.2 mm (6.1 in)
1942	112.1 mm (4.4 in)
1943	127.6 mm (5.0 in)
1944	91.4 mm (3.6 in)
1945	77.9 mm (3.1 in)
1946	104.4 mm (4.1 in)
1947	77.2 mm (3.0 in)
1948	81.2 mm (3.2 in)
1949	118.6 mm (4.7 in)
1950	165.9 mm (6.5 in)
1951	128.3 mm (5.1 in)
1952	75.2 mm (3.0 in)
1953	88.7 mm (3.5 in)
1954	53.3 mm (2.1 in)
1955	74.2 mm (2.9 in)
1956	88.7 mm (3.5 in)
1957	90.5 mm (3.6 in)
1958	112.8 mm (4.4 in)
1959	64.7 mm (2.5 in)
1960	85.1 mm (3.4 in)
1961	124.7 mm (4.9 in)
1962	61.7 mm (2.4 in)
1963	49.8 mm (2.0 in)
1964	124.0 mm (4.9 in)
1965	154.4 mm (6.1 in)
1966	83.9 mm (3.3 in)
1967	97.7 mm (3.8 in)
1968	121.0 mm (4.8 in)
1969	155.5 mm (6.1 in)
1970	89.9 mm (3.5 in)
1971	73.9 mm (2.9 in)
1972	94.5 mm (3.7 in)
1973	89.1 mm (3.5 in)
1974	191.1 mm (7.5 in)
1975	86.2 mm (3.4 in)
1976	75.3 mm (3.0 in)
1977	157.1 mm (6.2 in)
1978	82.8 mm (3.3 in)
1979	78.2 mm (3.1 in)
1980	134.3 mm (5.3 in)
1981	119.9 mm (4.7 in)
1982	132.6 mm (5.2 in)
1983	72.7 mm (2.9 in)
1984	92.4 mm (3.6 in)
1985	137.2 mm (5.4 in)
1986	207.3 mm (8.2 in)
1987	47.2 mm (1.9 in)
1988	55.1 mm (2.2 in)
1989	85.6 mm (3.4 in)
1990	96.0 mm (3.8 in)
1991	91.2 mm (3.6 in)
1992	110.5 mm (4.4 in)
1993	145.7 mm (5.7 in)
1994	83.3 mm (3.3 in)
1995	92.9 mm (3.7 in)
1996	37.6 mm (1.5 in)
1997	73.4 mm (2.9 in)
1998	53.8 mm (2.1 in)
2000	44.1 mm (1.7 in)
2001	83.4 mm (3.3 in)
2002	95.8 mm (3.8 in)
2003	197.1 mm (7.8 in)
2004	90.4 mm (3.6 in)
2005	63.8 mm (2.5 in)
2006	82.8 mm (3.3 in)
2007	86.9 mm (3.4 in)
2008	157.2 mm (6.2 in)
2009	91.3 mm (3.6 in)
2010	62.2 mm (2.4 in)
2011	85.4 mm (3.4 in)
2012	81.1 mm (3.2 in)
2013	132.5 mm (5.2 in)
2014	104.4 mm (4.1 in)
2015	129.8 mm (5.1 in)
2016	107.5 mm (4.2 in)
2017	95.6 mm (3.8 in)
2018	0.0 mm (0.00 in)
2019	36.3 mm (1.4 in)
2020	120.0 mm (4.7 in)
2021	109.1 mm (4.3 in)
2022	83.6 mm (3.3 in)
2023	89.4 mm (3.5 in)
2024	98.6 mm (3.9 in)
2025	67.4 mm (2.7 in)
2026	63.2 mm (2.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Mackinaw 3WSW, 1940 to 2026. The record is 38 days in 1989, marked on the chart; the median year is 19 days.

Longest dry spell (CDD) at Mackinaw 3WSW by year
Year	Longest dry spell (CDD)
1940	16 days
1941	18 days
1942	15 days
1943	27 days
1944	30 days
1945	26 days
1946	22 days
1947	23 days
1948	25 days
1949	22 days
1950	24 days
1951	15 days
1952	29 days
1953	23 days
1954	31 days
1955	15 days
1956	25 days
1957	24 days
1958	13 days
1959	15 days
1960	23 days
1961	22 days
1962	20 days
1963	18 days
1964	35 days
1965	16 days
1966	25 days
1967	18 days
1968	16 days
1969	18 days
1970	16 days
1971	24 days
1972	13 days
1973	19 days
1974	18 days
1975	11 days
1976	27 days
1977	19 days
1978	17 days
1979	29 days
1980	16 days
1981	24 days
1982	17 days
1983	19 days
1984	16 days
1985	11 days
1986	22 days
1987	21 days
1988	31 days
1989	38 days
1990	18 days
1991	16 days
1992	18 days
1993	19 days
1994	21 days
1995	28 days
1996	9 days
1997	21 days
1998	9 days
2000	13 days
2001	16 days
2002	23 days
2003	23 days
2004	20 days
2005	21 days
2006	16 days
2007	17 days
2008	15 days
2009	23 days
2010	20 days
2011	14 days
2012	21 days
2013	16 days
2014	13 days
2015	20 days
2016	14 days
2017	19 days
2018	4 days
2019	13 days
2020	14 days
2021	13 days
2022	17 days
2023	21 days
2024	20 days
2025	17 days
2026	31 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

62 years, 1941 to 2017

A day with at least 68.1 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 140.0 mm (5.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Mackinaw 3WSW: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	68.1 mm (2.7 in)
5 years	88.5 mm (3.5 in)
10 years	101.5 mm (4.0 in)
25 years	117.5 mm (4.6 in)
50 years	128.9 mm (5.1 in)
100 years	140.0 mm (5.5 in)	Longer than the 62 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 62 years of values from 1941 to 2017.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 152.4 mm (6.0 in) in 1986; 127.3 mm (5.0 in) in 2003; 127.0 mm (5.0 in) in 1993.

Download the Data

Data for Mackinaw 3WSW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Mackinaw 3WSW threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-14. Last revised 14 October 2026 (2026-10-14).

Year	Days with data	Share of year	Complete
1942	139	38%	No
1943	363	99%	Yes
1944	361	99%	Yes
1945	87	24%	No