Mt Olive 1 E Weather Records (USC00115917)

Record envelope, standing records and threshold days for Mt Olive 1 E (USC00115917), Illinois, United States, with 87 years of record.

Key Facts for Mt Olive 1 E

Mt Olive 1 E (USC00115917) is a weather station in Illinois, United States at 39.07 latitude and -89.70 longitude, 204 m (670 ft) above sea level.
The station reports from 1940 to 2026, 87 years of record.
1,464 records set at Mt Olive 1 E still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Mt Olive 1 E set a monthly record daily precipitation of 84.1 mm (3.3 in) on 26 July 2026.

About the Station

Location: Illinois, United States, 39.07 latitude, -89.70 longitude.
Elevation: 204 m (670 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 Mt Olive 1 E. 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 Mt Olive 1 E, 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)	-21.1 C (-6.0 F)	n/a	n/a
Feb	20.0 C (68.0 F)	-18.9 C (-2.0 F)	n/a	n/a
Mar	26.7 C (80.1 F)	-17.8 C (0.0 F)	n/a	n/a
Apr	30.6 C (87.1 F)	-5.6 C (21.9 F)	n/a	n/a
May	33.3 C (91.9 F)	6.7 C (44.1 F)	n/a	n/a
Jun	37.8 C (100.0 F)	10.0 C (50.0 F)	n/a	n/a
Jul	37.8 C (100.0 F)	15.6 C (60.1 F)	n/a	n/a
Aug	37.2 C (99.0 F)	15.6 C (60.1 F)	n/a	n/a
Sep	34.4 C (93.9 F)	-1.1 C (30.0 F)	n/a	n/a
Oct	28.9 C (84.0 F)	-7.2 C (19.0 F)	n/a	n/a
Nov	25.0 C (77.0 F)	-10.0 C (14.0 F)	n/a	n/a
Dec	20.0 C (68.0 F)	-18.9 C (-2.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Mt Olive 1 E still stand. 1941 holds the most, with 409.

All-Time Record Progression

1 new records

1 all-time records were set at Mt Olive 1 E between 27 December 2015 and 27 December 2015. Each dot is a new record.

Wettest Day of Each Month

Dec: 140.0 mm (5.5 in)

The wettest day on record for each calendar month at Mt Olive 1 E. The most was 140.0 mm (5.5 in) on 27 December 2015.

Record daily precipitation for each month at Mt Olive 1 E
Month	Record daily precipitation (mm)	Date
Jan	71.9 mm (2.8 in)	11 January 2020
Feb	54.9 mm (2.2 in)	7 February 1999
Mar	73.2 mm (2.9 in)	28 March 1977
Apr	123.7 mm (4.9 in)	22 April 1944
May	99.6 mm (3.9 in)	26 May 2008
Jun	92.7 mm (3.6 in)	14 June 1957
Jul	84.1 mm (3.3 in)	26 July 2026
Aug	90.2 mm (3.6 in)	28 August 1974
Sep	129.5 mm (5.1 in)	17 September 1969
Oct	83.3 mm (3.3 in)	24 October 1976
Nov	135.1 mm (5.3 in)	5 November 2024
Dec	140.0 mm (5.5 in)	27 December 2015

Period of Record Coverage

1940 to 1948

6 years of record at Mt Olive 1 E, 1940 to 1948. 4 years have data for under 90 percent of days and are left out of rankings: 1940, 1942, 1944, 1948.

Latest Records

Latest records at Mt Olive 1 E
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
26 July 2026	Mt Olive 1 E, US	monthly rain	84.1 mm (3.3 in)	5.9 mm (0.23 in)	52 years	37 of 100 (Notable)
17 July 2026	Mt Olive 1 E, US	daily rain	33.5 mm (1.3 in)	5.8 mm (0.23 in)	80 years	36 of 100 (Notable)
9 June 2026	Mt Olive 1 E, US	daily rain	65.0 mm (2.6 in)	31.5 mm (1.2 in)	80 years	54 of 100 (Notable)
28 April 2026	Mt Olive 1 E, US	daily rain	77.0 mm (3.0 in)	44.0 mm (1.7 in)	32 years	49 of 100 (Notable)
16 April 2026	Mt Olive 1 E, US	daily rain	39.4 mm (1.6 in)	11.2 mm (0.4 in)	13 years	20 of 100 (Routine)
26 January 2026	Mt Olive 1 E, US	daily snowfall	16.5 cm (6.5 in)	10.1 cm (4.0 in)	3 years	32 of 100 (Routine)
5 December 2025	Mt Olive 1 E, US	daily snow depth	10.2 cm (4.0 in)	5.1 cm (2.0 in)	75 years	39 of 100 (Notable)
4 December 2025	Mt Olive 1 E, US	daily snow depth	12.7 cm (5.0 in)	10.2 cm (4.0 in)	58 years	43 of 100 (Notable)
3 December 2025	Mt Olive 1 E, US	daily snow depth	15.2 cm (6.0 in)	10.1 cm (4.0 in)	72 years	47 of 100 (Notable)
2 December 2025	Mt Olive 1 E, US	daily snow depth	15.2 cm (6.0 in)	7.6 cm (3.0 in)	72 years	42 of 100 (Notable)
2 December 2025	Mt Olive 1 E, US	daily snowfall	5.3 cm (2.1 in)	0.2 cm (0.1 in)	72 years	29 of 100 (Routine)
1 December 2025	Mt Olive 1 E, US	daily snow depth	12.7 cm (5.0 in)	5.1 cm (2.0 in)	72 years	38 of 100 (Notable)
30 November 2025	Mt Olive 1 E, US	daily snowfall	17.3 cm (6.8 in)	14.8 cm (5.8 in)	60 years	53 of 100 (Notable)
30 November 2025	Mt Olive 1 E, US	daily snow depth	12.7 cm (5.0 in)	10.2 cm (4.0 in)	80 years	48 of 100 (Notable)
19 October 2025	Mt Olive 1 E, US	daily rain	48.5 mm (1.9 in)	31.5 mm (1.2 in)	20 years	40 of 100 (Notable)
20 May 2025	Mt Olive 1 E, US	daily rain	26.7 mm (1.1 in)	1.3 mm (0.05 in)	36 years	18 of 100 (Routine)
5 April 2025	Mt Olive 1 E, US	daily rain	79.5 mm (3.1 in)	54.6 mm (2.1 in)	22 years	54 of 100 (Notable)
11 January 2025	Mt Olive 1 E, US	daily snowfall	4.3 cm (1.7 in)	0.5 cm (0.2 in)	79 years	20 of 100 (Routine)
6 January 2025	Mt Olive 1 E, US	daily snowfall	19.1 cm (7.5 in)	3.9 cm (1.5 in)	11 years	20 of 100 (Routine)
5 November 2024	Mt Olive 1 E, US	monthly rain	135.1 mm (5.3 in)	43.7 mm (1.7 in)	78 years	74 of 100 (Major)

Extremes by Year

1940 to 2026

Yearly extremes at Mt Olive 1 E: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.8 C (100.0 F)	1941	35.9 C (96.5 F)	6
Coldest night (TNn)	-21.1 C (-6.0 F)	1948	-17.2 C (1.0 F)	7
Wettest day (Rx1day)	140.0 mm (5.5 in)	2015	64.0 mm (2.5 in)	87
Wettest five days (Rx5day)	220.5 mm (8.7 in)	2015	104.2 mm (4.1 in)	87
Longest dry spell (CDD)	40 days	1956	22 days	87

Hottest day (TXx)

The hottest day of the year at Mt Olive 1 E, 1940 to 2026. The record is 37.8 C (100.0 F) in 1941, marked on the chart; the median year is 35.9 C (96.5 F).

Hottest day (TXx) at Mt Olive 1 E by year
Year	Hottest day (TXx)
1940	25.0 C (77.0 F)
1941	37.8 C (100.0 F)
1942	35.6 C (96.1 F)
1943	36.1 C (97.0 F)
1944	37.8 C (100.0 F)
1945	n/a
1946	n/a
1947	n/a
1948	31.1 C (88.0 F)
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
1999	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 Mt Olive 1 E, 1940 to 2026. The record is -21.1 C (-6.0 F) in 1948, marked on the chart; the median year is -17.2 C (1.0 F).

Coldest night (TNn) at Mt Olive 1 E by year
Year	Coldest night (TNn)
1940	-11.1 C (12.0 F)
1941	-12.2 C (10.0 F)
1942	-16.7 C (1.9 F)
1943	-18.9 C (-2.0 F)
1944	-17.8 C (0.0 F)
1945	n/a
1946	n/a
1947	n/a
1948	-21.1 C (-6.0 F)
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	-17.2 C (1.0 F)
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
1999	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 Mt Olive 1 E, 1940 to 2026. The record is 140.0 mm (5.5 in) in 2015, marked on the chart; the median year is 64.0 mm (2.5 in).

Wettest day (Rx1day) at Mt Olive 1 E by year
Year	Wettest day (Rx1day)
1940	25.4 mm (1.0 in)
1941	42.9 mm (1.7 in)
1942	69.9 mm (2.8 in)
1943	98.0 mm (3.9 in)
1944	123.7 mm (4.9 in)
1945	82.3 mm (3.2 in)
1946	91.4 mm (3.6 in)
1947	37.8 mm (1.5 in)
1948	45.5 mm (1.8 in)
1949	56.9 mm (2.2 in)
1950	66.5 mm (2.6 in)
1951	90.9 mm (3.6 in)
1952	59.7 mm (2.4 in)
1953	59.9 mm (2.4 in)
1954	50.8 mm (2.0 in)
1955	66.3 mm (2.6 in)
1956	59.2 mm (2.3 in)
1957	92.7 mm (3.6 in)
1958	50.8 mm (2.0 in)
1959	51.3 mm (2.0 in)
1960	50.5 mm (2.0 in)
1961	66.0 mm (2.6 in)
1962	47.2 mm (1.9 in)
1963	71.1 mm (2.8 in)
1964	47.8 mm (1.9 in)
1965	47.8 mm (1.9 in)
1966	83.1 mm (3.3 in)
1967	72.4 mm (2.9 in)
1968	50.8 mm (2.0 in)
1969	129.5 mm (5.1 in)
1970	71.1 mm (2.8 in)
1971	63.5 mm (2.5 in)
1972	59.4 mm (2.3 in)
1973	78.2 mm (3.1 in)
1974	90.2 mm (3.6 in)
1975	64.0 mm (2.5 in)
1976	83.3 mm (3.3 in)
1977	73.2 mm (2.9 in)
1978	45.5 mm (1.8 in)
1979	71.4 mm (2.8 in)
1980	37.6 mm (1.5 in)
1981	56.9 mm (2.2 in)
1982	57.7 mm (2.3 in)
1983	73.7 mm (2.9 in)
1984	62.2 mm (2.4 in)
1985	78.5 mm (3.1 in)
1986	68.8 mm (2.7 in)
1987	63.8 mm (2.5 in)
1988	51.3 mm (2.0 in)
1989	55.6 mm (2.2 in)
1990	79.2 mm (3.1 in)
1991	55.9 mm (2.2 in)
1992	56.1 mm (2.2 in)
1993	68.6 mm (2.7 in)
1994	50.8 mm (2.0 in)
1995	67.3 mm (2.6 in)
1996	70.4 mm (2.8 in)
1997	54.6 mm (2.1 in)
1998	64.8 mm (2.6 in)
1999	54.9 mm (2.2 in)
2000	69.9 mm (2.8 in)
2001	42.4 mm (1.7 in)
2002	72.1 mm (2.8 in)
2003	89.2 mm (3.5 in)
2004	54.6 mm (2.1 in)
2005	53.6 mm (2.1 in)
2006	64.0 mm (2.5 in)
2007	46.7 mm (1.8 in)
2008	99.6 mm (3.9 in)
2009	55.6 mm (2.2 in)
2010	79.5 mm (3.1 in)
2011	66.5 mm (2.6 in)
2012	57.4 mm (2.3 in)
2013	80.8 mm (3.2 in)
2014	54.6 mm (2.1 in)
2015	140.0 mm (5.5 in)
2016	53.3 mm (2.1 in)
2017	69.3 mm (2.7 in)
2018	54.9 mm (2.2 in)
2019	64.8 mm (2.6 in)
2020	71.9 mm (2.8 in)
2021	48.5 mm (1.9 in)
2022	69.3 mm (2.7 in)
2023	61.2 mm (2.4 in)
2024	135.1 mm (5.3 in)
2025	79.5 mm (3.1 in)
2026	84.1 mm (3.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Mt Olive 1 E, 1940 to 2026. The record is 220.5 mm (8.7 in) in 2015, marked on the chart; the median year is 104.2 mm (4.1 in).

Wettest five days (Rx5day) at Mt Olive 1 E by year
Year	Wettest five days (Rx5day)
1940	36.6 mm (1.4 in)
1941	105.7 mm (4.2 in)
1942	104.2 mm (4.1 in)
1943	193.1 mm (7.6 in)
1944	154.2 mm (6.1 in)
1945	127.0 mm (5.0 in)
1946	165.6 mm (6.5 in)
1947	75.4 mm (3.0 in)
1948	70.1 mm (2.8 in)
1949	76.6 mm (3.0 in)
1950	133.8 mm (5.3 in)
1951	127.7 mm (5.0 in)
1952	91.5 mm (3.6 in)
1953	116.1 mm (4.6 in)
1954	102.9 mm (4.1 in)
1955	75.4 mm (3.0 in)
1956	76.8 mm (3.0 in)
1957	158.7 mm (6.2 in)
1958	88.6 mm (3.5 in)
1959	63.3 mm (2.5 in)
1960	70.9 mm (2.8 in)
1961	125.2 mm (4.9 in)
1962	80.0 mm (3.1 in)
1963	76.2 mm (3.0 in)
1964	64.5 mm (2.5 in)
1965	51.6 mm (2.0 in)
1966	156.0 mm (6.1 in)
1967	99.8 mm (3.9 in)
1968	118.1 mm (4.6 in)
1969	132.0 mm (5.2 in)
1970	91.1 mm (3.6 in)
1971	120.4 mm (4.7 in)
1972	90.6 mm (3.6 in)
1973	136.6 mm (5.4 in)
1974	119.2 mm (4.7 in)
1975	94.0 mm (3.7 in)
1976	91.2 mm (3.6 in)
1977	103.1 mm (4.1 in)
1978	73.4 mm (2.9 in)
1979	100.3 mm (3.9 in)
1980	59.7 mm (2.4 in)
1981	74.7 mm (2.9 in)
1982	93.8 mm (3.7 in)
1983	120.3 mm (4.7 in)
1984	100.0 mm (3.9 in)
1985	117.8 mm (4.6 in)
1986	165.9 mm (6.5 in)
1987	77.6 mm (3.1 in)
1988	71.9 mm (2.8 in)
1989	75.4 mm (3.0 in)
1990	136.4 mm (5.4 in)
1991	85.9 mm (3.4 in)
1992	98.4 mm (3.9 in)
1993	128.8 mm (5.1 in)
1994	113.0 mm (4.4 in)
1995	118.6 mm (4.7 in)
1996	93.5 mm (3.7 in)
1997	66.0 mm (2.6 in)
1998	116.2 mm (4.6 in)
1999	61.5 mm (2.4 in)
2000	135.4 mm (5.3 in)
2001	105.4 mm (4.1 in)
2002	119.4 mm (4.7 in)
2003	130.5 mm (5.1 in)
2004	108.7 mm (4.3 in)
2005	124.5 mm (4.9 in)
2006	74.4 mm (2.9 in)
2007	69.3 mm (2.7 in)
2008	131.3 mm (5.2 in)
2009	75.9 mm (3.0 in)
2010	121.5 mm (4.8 in)
2011	105.2 mm (4.1 in)
2012	72.7 mm (2.9 in)
2013	132.1 mm (5.2 in)
2014	83.8 mm (3.3 in)
2015	220.5 mm (8.7 in)
2016	105.9 mm (4.2 in)
2017	150.6 mm (5.9 in)
2018	110.3 mm (4.3 in)
2019	100.1 mm (3.9 in)
2020	116.4 mm (4.6 in)
2021	110.1 mm (4.3 in)
2022	108.7 mm (4.3 in)
2023	83.7 mm (3.3 in)
2024	184.1 mm (7.2 in)
2025	113.7 mm (4.5 in)
2026	102.1 mm (4.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Mt Olive 1 E, 1940 to 2026. The record is 40 days in 1956, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Mt Olive 1 E by year
Year	Longest dry spell (CDD)
1940	10 days
1941	19 days
1942	22 days
1943	25 days
1944	28 days
1945	24 days
1946	23 days
1947	28 days
1948	19 days
1949	21 days
1950	20 days
1951	14 days
1952	23 days
1953	26 days
1954	31 days
1955	30 days
1956	40 days
1957	23 days
1958	26 days
1959	23 days
1960	14 days
1961	19 days
1962	23 days
1963	17 days
1964	32 days
1965	20 days
1966	28 days
1967	24 days
1968	33 days
1969	24 days
1970	25 days
1971	37 days
1972	22 days
1973	16 days
1974	27 days
1975	16 days
1976	25 days
1977	17 days
1978	22 days
1979	35 days
1980	17 days
1981	19 days
1982	15 days
1983	21 days
1984	19 days
1985	28 days
1986	25 days
1987	24 days
1988	32 days
1989	28 days
1990	17 days
1991	24 days
1992	29 days
1993	21 days
1994	17 days
1995	32 days
1996	22 days
1997	18 days
1998	17 days
1999	23 days
2000	25 days
2001	16 days
2002	33 days
2003	26 days
2004	20 days
2005	20 days
2006	22 days
2007	23 days
2008	21 days
2009	25 days
2010	20 days
2011	20 days
2012	21 days
2013	21 days
2014	15 days
2015	27 days
2016	18 days
2017	31 days
2018	19 days
2019	11 days
2020	16 days
2021	14 days
2022	17 days
2023	21 days
2024	32 days
2025	37 days
2026	19 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

83 years, 1941 to 2025

A day with at least 63.0 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 139.6 mm (5.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Mt Olive 1 E: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	63.0 mm (2.5 in)
5 years	80.0 mm (3.1 in)
10 years	92.5 mm (3.6 in)
25 years	110.0 mm (4.3 in)
50 years	124.3 mm (4.9 in)
100 years	139.6 mm (5.5 in)	Longer than the 83 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, 83 years of values from 1941 to 2025.

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: 140.0 mm (5.5 in) in 2015; 135.1 mm (5.3 in) in 2024; 129.5 mm (5.1 in) in 1969.

Download the Data

Data for Mt Olive 1 E standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Mt Olive 1 E 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Year	Days with data	Share of year	Complete
1940	55	15%	No
1941	339	93%	Yes
1942	324	89%	No
1943	329	90%	Yes
1944	110	30%	No
1948	137	37%	No