Grafton Weather Records (USC00113572)

Record envelope, standing records and threshold days for Grafton (USC00113572), Illinois, United States, with 108 years of record.

Key Facts for Grafton

Grafton (USC00113572) is a weather station in Illinois, United States at 38.97 latitude and -90.43 longitude, 135 m (443 ft) above sea level.
The station reports from 1894 to 2001, 108 years of record.
0 records set at Grafton still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Grafton set a daily record precipitation of 48.8 mm (1.9 in) on 11 October 2001.

About the Station

Location: Illinois, United States, 38.97 latitude, -90.43 longitude.
Elevation: 135 m (443 ft).
Period of record: 1894 to 2001, 108 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 Grafton. 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 Grafton, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

0 standing records

0 records at Grafton still stand.

All-Time Record Progression

1 new records

1 all-time records were set at Grafton between 9 July 1942 and 9 July 1942. Each dot is a new record.

Wettest Day of Each Month

Jul: 190.5 mm (7.5 in)

The wettest day on record for each calendar month at Grafton. The most was 190.5 mm (7.5 in) on 9 July 1942.

Record daily precipitation for each month at Grafton
Month	Record daily precipitation (mm)	Date
Jan	70.6 mm (2.8 in)	4 January 1950
Feb	57.2 mm (2.3 in)	27 February 1997
Mar	77.2 mm (3.0 in)	28 March 1977
Apr	114.3 mm (4.5 in)	29 April 1996
May	87.6 mm (3.4 in)	7 May 1943
Jun	123.7 mm (4.9 in)	27 June 1949
Jul	190.5 mm (7.5 in)	9 July 1942
Aug	113.8 mm (4.5 in)	16 August 1946
Sep	104.4 mm (4.1 in)	23 September 1993
Oct	157.5 mm (6.2 in)	18 October 1905
Nov	107.2 mm (4.2 in)	1 November 1946
Dec	109.5 mm (4.3 in)	3 December 1982

Latest Records

Latest records at Grafton
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
11 October 2001	Grafton, US	daily rain	48.8 mm (1.9 in)	23.9 mm (0.9 in)	102 years	58 of 100 (Notable)
24 June 2000	Grafton, US	daily rain	78.7 mm (3.1 in)	40.3 mm (1.6 in)	16 years	44 of 100 (Notable)
27 April 2000	Grafton, US	daily rain	27.2 mm (1.1 in)	2.1 mm (0.08 in)	43 years	23 of 100 (Routine)
27 March 2000	Grafton, US	daily rain	39.9 mm (1.6 in)	4.8 mm (0.19 in)	66 years	33 of 100 (Routine)
29 January 2000	Grafton, US	daily rain	48.3 mm (1.9 in)	30.0 mm (1.2 in)	25 years	48 of 100 (Notable)
17 August 1998	Grafton, US	daily rain	43.4 mm (1.7 in)	0.2 mm (0.01 in)	83 years	34 of 100 (Routine)
21 May 1998	Grafton, US	daily rain	43.9 mm (1.7 in)	1.2 mm (0.05 in)	51 years	25 of 100 (Routine)
6 January 1998	Grafton, US	daily rain	30.5 mm (1.2 in)	5.4 mm (0.21 in)	8 years	17 of 100 (Routine)
5 November 1997	Grafton, US	daily rain	50.8 mm (2.0 in)	16.5 mm (0.6 in)	55 years	39 of 100 (Notable)
10 October 1997	Grafton, US	daily rain	31.8 mm (1.3 in)	12.5 mm (0.5 in)	88 years	45 of 100 (Notable)
1 September 1997	Grafton, US	daily rain	33.5 mm (1.3 in)	2.0 mm (0.08 in)	23 years	17 of 100 (Routine)
27 February 1997	Grafton, US	monthly rain	57.2 mm (2.3 in)	1.3 mm (0.05 in)	46 years	34 of 100 (Routine)
27 January 1997	Grafton, US	daily rain	27.9 mm (1.1 in)	10.6 mm (0.4 in)	43 years	33 of 100 (Routine)
8 January 1997	Grafton, US	daily rain	52.1 mm (2.1 in)	20.3 mm (0.8 in)	60 years	49 of 100 (Notable)
7 November 1996	Grafton, US	daily rain	100.8 mm (4.0 in)	49.2 mm (1.9 in)	71 years	71 of 100 (Major)
24 September 1996	Grafton, US	daily rain	31.5 mm (1.2 in)	9.7 mm (0.38 in)	5 years	17 of 100 (Routine)
1 July 1996	Grafton, US	daily rain	91.4 mm (3.6 in)	43.9 mm (1.7 in)	49 years	51 of 100 (Notable)
29 April 1996	Grafton, US	monthly rain	114.3 mm (4.5 in)	26.7 mm (1.1 in)	88 years	68 of 100 (Major)
23 July 1995	Grafton, US	daily rain	54.4 mm (2.1 in)	18.1 mm (0.7 in)	64 years	40 of 100 (Notable)
17 May 1995	Grafton, US	daily rain	51.3 mm (2.0 in)	7.1 mm (0.28 in)	52 years	30 of 100 (Routine)

Extremes by Year

1894 to 2001

Yearly extremes at Grafton: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	190.5 mm (7.5 in)	1942	61.9 mm (2.4 in)	108
Wettest five days (Rx5day)	236.2 mm (9.3 in)	1942	99.2 mm (3.9 in)	108
Longest dry spell (CDD)	48 days	1999	23 days	108

Wettest day (Rx1day)

The wettest day of the year at Grafton, 1894 to 2001. The record is 190.5 mm (7.5 in) in 1942, marked on the chart; the median year is 61.9 mm (2.4 in).

Wettest day (Rx1day) at Grafton by year
Year	Wettest day (Rx1day)
1894	36.8 mm (1.4 in)
1895	54.4 mm (2.1 in)
1896	51.8 mm (2.0 in)
1897	63.5 mm (2.5 in)
1898	54.9 mm (2.2 in)
1899	49.8 mm (2.0 in)
1900	64.0 mm (2.5 in)
1901	47.0 mm (1.9 in)
1902	81.5 mm (3.2 in)
1903	82.6 mm (3.3 in)
1904	50.8 mm (2.0 in)
1905	157.5 mm (6.2 in)
1906	61.0 mm (2.4 in)
1907	71.6 mm (2.8 in)
1908	87.6 mm (3.4 in)
1909	78.7 mm (3.1 in)
1910	86.4 mm (3.4 in)
1911	58.4 mm (2.3 in)
1912	45.7 mm (1.8 in)
1913	68.6 mm (2.7 in)
1914	38.9 mm (1.5 in)
1915	68.6 mm (2.7 in)
1916	64.8 mm (2.6 in)
1917	47.8 mm (1.9 in)
1918	50.0 mm (2.0 in)
1919	52.6 mm (2.1 in)
1920	64.3 mm (2.5 in)
1921	51.8 mm (2.0 in)
1922	71.9 mm (2.8 in)
1923	87.6 mm (3.4 in)
1924	48.3 mm (1.9 in)
1925	75.9 mm (3.0 in)
1926	54.9 mm (2.2 in)
1927	54.6 mm (2.1 in)
1928	59.2 mm (2.3 in)
1929	45.2 mm (1.8 in)
1930	38.6 mm (1.5 in)
1931	56.6 mm (2.2 in)
1932	42.7 mm (1.7 in)
1933	48.8 mm (1.9 in)
1934	82.6 mm (3.3 in)
1935	47.5 mm (1.9 in)
1936	87.9 mm (3.5 in)
1937	57.2 mm (2.3 in)
1938	64.0 mm (2.5 in)
1939	49.3 mm (1.9 in)
1940	41.4 mm (1.6 in)
1941	54.9 mm (2.2 in)
1942	190.5 mm (7.5 in)
1943	87.6 mm (3.4 in)
1944	73.7 mm (2.9 in)
1945	57.7 mm (2.3 in)
1946	113.8 mm (4.5 in)
1947	47.5 mm (1.9 in)
1948	77.0 mm (3.0 in)
1949	123.7 mm (4.9 in)
1950	70.6 mm (2.8 in)
1951	62.0 mm (2.4 in)
1952	33.8 mm (1.3 in)
1953	45.5 mm (1.8 in)
1954	33.0 mm (1.3 in)
1955	39.4 mm (1.6 in)
1956	61.2 mm (2.4 in)
1957	82.6 mm (3.3 in)
1958	58.9 mm (2.3 in)
1959	98.6 mm (3.9 in)
1960	73.4 mm (2.9 in)
1961	68.8 mm (2.7 in)
1962	51.8 mm (2.0 in)
1963	61.0 mm (2.4 in)
1964	62.2 mm (2.4 in)
1965	63.5 mm (2.5 in)
1966	46.5 mm (1.8 in)
1967	42.2 mm (1.7 in)
1968	71.4 mm (2.8 in)
1969	101.6 mm (4.0 in)
1970	68.3 mm (2.7 in)
1971	43.7 mm (1.7 in)
1972	63.0 mm (2.5 in)
1973	85.1 mm (3.4 in)
1974	68.1 mm (2.7 in)
1975	79.2 mm (3.1 in)
1976	101.1 mm (4.0 in)
1977	77.2 mm (3.0 in)
1978	52.1 mm (2.1 in)
1979	68.6 mm (2.7 in)
1980	47.8 mm (1.9 in)
1981	76.5 mm (3.0 in)
1982	109.5 mm (4.3 in)
1983	79.0 mm (3.1 in)
1984	56.6 mm (2.2 in)
1985	61.7 mm (2.4 in)
1986	64.0 mm (2.5 in)
1987	65.0 mm (2.6 in)
1988	56.6 mm (2.2 in)
1989	63.2 mm (2.5 in)
1990	69.6 mm (2.7 in)
1991	59.2 mm (2.3 in)
1992	50.8 mm (2.0 in)
1993	104.4 mm (4.1 in)
1994	61.7 mm (2.4 in)
1995	64.0 mm (2.5 in)
1996	114.3 mm (4.5 in)
1997	57.2 mm (2.3 in)
1998	43.9 mm (1.7 in)
1999	43.2 mm (1.7 in)
2000	78.7 mm (3.1 in)
2001	48.8 mm (1.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Grafton, 1894 to 2001. The record is 236.2 mm (9.3 in) in 1942, marked on the chart; the median year is 99.2 mm (3.9 in).

Wettest five days (Rx5day) at Grafton by year
Year	Wettest five days (Rx5day)
1894	47.0 mm (1.9 in)
1895	136.7 mm (5.4 in)
1896	89.7 mm (3.5 in)
1897	94.0 mm (3.7 in)
1898	104.9 mm (4.1 in)
1899	79.5 mm (3.1 in)
1900	70.3 mm (2.8 in)
1901	54.6 mm (2.1 in)
1902	155.4 mm (6.1 in)
1903	107.0 mm (4.2 in)
1904	88.6 mm (3.5 in)
1905	169.7 mm (6.7 in)
1906	83.3 mm (3.3 in)
1907	88.9 mm (3.5 in)
1908	115.0 mm (4.5 in)
1909	112.7 mm (4.4 in)
1910	133.6 mm (5.3 in)
1911	74.0 mm (2.9 in)
1912	108.9 mm (4.3 in)
1913	108.2 mm (4.3 in)
1914	56.3 mm (2.2 in)
1915	182.4 mm (7.2 in)
1916	137.4 mm (5.4 in)
1917	78.9 mm (3.1 in)
1918	82.5 mm (3.2 in)
1919	118.6 mm (4.7 in)
1920	90.2 mm (3.6 in)
1921	80.8 mm (3.2 in)
1922	101.1 mm (4.0 in)
1923	118.4 mm (4.7 in)
1924	81.0 mm (3.2 in)
1925	88.1 mm (3.5 in)
1926	106.3 mm (4.2 in)
1927	135.2 mm (5.3 in)
1928	91.5 mm (3.6 in)
1929	104.4 mm (4.1 in)
1930	66.8 mm (2.6 in)
1931	67.0 mm (2.6 in)
1932	73.2 mm (2.9 in)
1933	93.2 mm (3.7 in)
1934	86.2 mm (3.4 in)
1935	87.9 mm (3.5 in)
1936	97.3 mm (3.8 in)
1937	94.5 mm (3.7 in)
1938	85.9 mm (3.4 in)
1939	91.8 mm (3.6 in)
1940	45.9 mm (1.8 in)
1941	116.3 mm (4.6 in)
1942	236.2 mm (9.3 in)
1943	172.7 mm (6.8 in)
1944	111.3 mm (4.4 in)
1945	107.2 mm (4.2 in)
1946	225.8 mm (8.9 in)
1947	75.7 mm (3.0 in)
1948	95.5 mm (3.8 in)
1949	129.3 mm (5.1 in)
1950	93.9 mm (3.7 in)
1951	81.3 mm (3.2 in)
1952	42.2 mm (1.7 in)
1953	48.0 mm (1.9 in)
1954	52.4 mm (2.1 in)
1955	76.9 mm (3.0 in)
1956	111.8 mm (4.4 in)
1957	110.4 mm (4.3 in)
1958	106.4 mm (4.2 in)
1959	104.7 mm (4.1 in)
1960	128.3 mm (5.1 in)
1961	155.9 mm (6.1 in)
1962	121.9 mm (4.8 in)
1963	77.7 mm (3.1 in)
1964	80.0 mm (3.1 in)
1965	94.0 mm (3.7 in)
1966	54.1 mm (2.1 in)
1967	63.7 mm (2.5 in)
1968	117.6 mm (4.6 in)
1969	154.2 mm (6.1 in)
1970	109.7 mm (4.3 in)
1971	96.3 mm (3.8 in)
1972	96.3 mm (3.8 in)
1973	106.8 mm (4.2 in)
1974	108.0 mm (4.3 in)
1975	102.6 mm (4.0 in)
1976	108.7 mm (4.3 in)
1977	103.1 mm (4.1 in)
1978	95.0 mm (3.7 in)
1979	109.2 mm (4.3 in)
1980	74.1 mm (2.9 in)
1981	105.6 mm (4.2 in)
1982	168.4 mm (6.6 in)
1983	135.1 mm (5.3 in)
1984	111.0 mm (4.4 in)
1985	108.5 mm (4.3 in)
1986	114.3 mm (4.5 in)
1987	80.2 mm (3.2 in)
1988	70.8 mm (2.8 in)
1989	82.1 mm (3.2 in)
1990	145.5 mm (5.7 in)
1991	119.9 mm (4.7 in)
1992	90.5 mm (3.6 in)
1993	159.1 mm (6.3 in)
1994	149.5 mm (5.9 in)
1995	133.1 mm (5.2 in)
1996	124.0 mm (4.9 in)
1997	82.8 mm (3.3 in)
1998	80.5 mm (3.2 in)
1999	95.3 mm (3.8 in)
2000	135.9 mm (5.4 in)
2001	72.7 mm (2.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Grafton, 1894 to 2001. The record is 48 days in 1999, marked on the chart; the median year is 23 days.

Longest dry spell (CDD) at Grafton by year
Year	Longest dry spell (CDD)
1894	18 days
1895	31 days
1896	21 days
1897	23 days
1898	21 days
1899	19 days
1900	21 days
1901	24 days
1902	20 days
1903	17 days
1904	29 days
1905	23 days
1906	20 days
1907	17 days
1908	25 days
1909	19 days
1910	25 days
1911	19 days
1912	18 days
1913	26 days
1914	22 days
1915	23 days
1916	28 days
1917	28 days
1918	29 days
1919	37 days
1920	27 days
1921	17 days
1922	22 days
1923	19 days
1924	22 days
1925	20 days
1926	15 days
1927	17 days
1928	18 days
1929	17 days
1930	24 days
1931	19 days
1932	17 days
1933	39 days
1934	26 days
1935	19 days
1936	26 days
1937	18 days
1938	24 days
1939	34 days
1940	35 days
1941	18 days
1942	28 days
1943	27 days
1944	29 days
1945	18 days
1946	17 days
1947	29 days
1948	20 days
1949	42 days
1950	29 days
1951	14 days
1952	27 days
1953	25 days
1954	22 days
1955	29 days
1956	32 days
1957	29 days
1958	32 days
1959	24 days
1960	13 days
1961	18 days
1962	32 days
1963	34 days
1964	29 days
1965	21 days
1966	19 days
1967	22 days
1968	24 days
1969	24 days
1970	25 days
1971	21 days
1972	15 days
1973	15 days
1974	19 days
1975	11 days
1976	25 days
1977	19 days
1978	20 days
1979	31 days
1980	22 days
1981	23 days
1982	17 days
1983	27 days
1984	33 days
1985	21 days
1986	22 days
1987	26 days
1988	26 days
1989	21 days
1990	18 days
1991	19 days
1992	21 days
1993	25 days
1994	23 days
1995	31 days
1996	27 days
1997	25 days
1998	39 days
1999	48 days
2000	18 days
2001	30 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

96 years, 1895 to 1998

A day with at least 61.4 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 156.3 mm (6.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Grafton: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	61.4 mm (2.4 in)
5 years	81.1 mm (3.2 in)
10 years	96.1 mm (3.8 in)
25 years	117.8 mm (4.6 in)
50 years	136.1 mm (5.4 in)
100 years	156.3 mm (6.2 in)	Longer than the 96 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, 96 years of values from 1895 to 1998.

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: 190.5 mm (7.5 in) in 1942; 157.5 mm (6.2 in) in 1905; 123.7 mm (4.9 in) in 1949.

Download the Data

Data for Grafton standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grafton 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a