Hamilton Weather Records (USC00333478)

Record envelope, standing records and threshold days for Hamilton (USC00333478), Ohio, United States, with 61 years of record.

Key Facts for Hamilton

Hamilton (USC00333478) is a weather station in Ohio, United States at 39.40 latitude and -84.58 longitude, 198 m (650 ft) above sea level.
The station reports from 1911 to 1971, 61 years of record.
124 records set at Hamilton still stand.
Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
Hamilton tied a daily record precipitation of 11.7 mm (0.5 in) on 24 July 1971.

About the Station

Location: Ohio, United States, 39.40 latitude, -84.58 longitude.
Elevation: 198 m (650 ft).
Period of record: 1911 to 1971, 61 years.
Eligible elements: prcp, snow.

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 Hamilton. 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 Hamilton, 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	37.2 C (99.0 F)	10.0 C (50.0 F)	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

124 standing records

124 records at Hamilton still stand. 1970 holds the most, with 124.

Wettest Day of Each Month

Aug: 113.8 mm (4.5 in)

The wettest day on record for each calendar month at Hamilton. The most was 113.8 mm (4.5 in) on 22 August 1920.

Record daily precipitation for each month at Hamilton
Month	Record daily precipitation (mm)	Date
Jan	77.2 mm (3.0 in)	22 January 1959
Feb	58.4 mm (2.3 in)	26 February 1929
Mar	96.5 mm (3.8 in)	28 March 1913
Apr	76.2 mm (3.0 in)	20 April 1940
May	69.9 mm (2.8 in)	8 May 1961
Jun	69.3 mm (2.7 in)	29 June 1967
Jul	87.6 mm (3.4 in)	21 July 1954
Aug	113.8 mm (4.5 in)	22 August 1920
Sep	90.9 mm (3.6 in)	3 September 1922
Oct	59.4 mm (2.3 in)	7 October 1936
Nov	61.2 mm (2.4 in)	3 November 1928
Dec	80.0 mm (3.1 in)	31 December 1932

Period of Record Coverage

1970 to 1970

1 years of record at Hamilton, 1970 to 1970. 1 years have data for under 90 percent of days and are left out of rankings: 1970.

Latest Records

Latest records at Hamilton
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
24 July 1971	Hamilton, US	daily rain (Tie)	11.7 mm (0.5 in)	tie	34 years	4 of 100 (Routine)
6 May 1971	Hamilton, US	daily rain	39.6 mm (1.6 in)	17.5 mm (0.7 in)	33 years	32 of 100 (Routine)
11 March 1971	Hamilton, US	daily snowfall (Tie)	5.1 cm (2.0 in)	tie	33 years	4 of 100 (Routine)
22 February 1971	Hamilton, US	daily rain	43.4 mm (1.7 in)	1.2 mm (0.05 in)	25 years	14 of 100 (Routine)
13 February 1971	Hamilton, US	daily snowfall	10.2 cm (4.0 in)	6.4 cm (2.5 in)	35 years	35 of 100 (Notable)
9 February 1971	Hamilton, US	daily snowfall	12.7 cm (5.0 in)	6.3 cm (2.5 in)	41 years	36 of 100 (Notable)
4 February 1971	Hamilton, US	daily rain	19.8 mm (0.8 in)	0.7 mm (0.03 in)	19 years	11 of 100 (Routine)
28 January 1971	Hamilton, US	daily snowfall (Tie)	2.5 cm (1.0 in)	tie	41 years	4 of 100 (Routine)
14 October 1970	Hamilton, US	daily rain	15.0 mm (0.6 in)	1.3 mm (0.05 in)	39 years	18 of 100 (Routine)
13 October 1970	Hamilton, US	daily rain	18.5 mm (0.7 in)	6.1 mm (0.24 in)	44 years	20 of 100 (Routine)
6 June 1970	Hamilton, US	daily rain	67.6 mm (2.7 in)	43.2 mm (1.7 in)	41 years	54 of 100 (Notable)
29 April 1970	Hamilton, US	daily rain	17.8 mm (0.7 in)	0.3 mm (0.01 in)	24 years	13 of 100 (Routine)
24 April 1970	Hamilton, US	daily rain	35.3 mm (1.4 in)	8.4 mm (0.33 in)	4 years	15 of 100 (Routine)
2 April 1970	Hamilton, US	daily rain	69.9 mm (2.8 in)	42.0 mm (1.7 in)	52 years	61 of 100 (Major)
29 March 1970	Hamilton, US	daily snowfall	2.5 cm (1.0 in)	2.5 cm (1.0 in)	56 years	20 of 100 (Routine)
18 March 1970	Hamilton, US	daily snowfall	10.2 cm (4.0 in)	5.6 cm (2.2 in)	15 years	21 of 100 (Routine)
15 March 1970	Hamilton, US	daily snowfall	3.0 cm (1.2 in)	1.7 cm (0.7 in)	56 years	20 of 100 (Routine)
13 March 1970	Hamilton, US	daily snowfall	17.8 cm (7.0 in)	11.4 cm (4.5 in)	32 years	39 of 100 (Notable)
19 November 1969	Hamilton, US	daily rain	38.1 mm (1.5 in)	13.5 mm (0.5 in)	31 years	29 of 100 (Routine)
18 September 1969	Hamilton, US	daily rain	32.5 mm (1.3 in)	9.6 mm (0.38 in)	20 years	18 of 100 (Routine)

Extremes by Year

1911 to 1971

Yearly extremes at Hamilton: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.2 C (99.0 F)	1970	37.2 C (99.0 F)	1
Coldest night (TNn)	10.0 C (50.0 F)	1970	10.0 C (50.0 F)	1
Wettest day (Rx1day)	113.8 mm (4.5 in)	1920	57.7 mm (2.3 in)	61
Wettest five days (Rx5day)	188.1 mm (7.4 in)	1958	95.4 mm (3.8 in)	56
Longest dry spell (CDD)	42 days	1924	19 days	56

Hottest day (TXx)

The hottest day of the year at Hamilton, 1911 to 1971. The record is 37.2 C (99.0 F) in 1970, marked on the chart; the median year is 37.2 C (99.0 F).

Hottest day (TXx) at Hamilton by year
Year	Hottest day (TXx)
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
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	37.2 C (99.0 F)
1971	n/a

Coldest night (TNn)

The coldest night of the year at Hamilton, 1911 to 1971. The record is 10.0 C (50.0 F) in 1970, marked on the chart; the median year is 10.0 C (50.0 F).

Coldest night (TNn) at Hamilton by year
Year	Coldest night (TNn)
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
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	10.0 C (50.0 F)
1971	n/a

Wettest day (Rx1day)

The wettest day of the year at Hamilton, 1911 to 1971. The record is 113.8 mm (4.5 in) in 1920, marked on the chart; the median year is 57.7 mm (2.3 in).

Wettest day (Rx1day) at Hamilton by year
Year	Wettest day (Rx1day)
1911	29.2 mm (1.1 in)
1912	47.5 mm (1.9 in)
1913	96.5 mm (3.8 in)
1914	85.3 mm (3.4 in)
1915	55.9 mm (2.2 in)
1916	74.9 mm (2.9 in)
1917	45.7 mm (1.8 in)
1918	38.6 mm (1.5 in)
1919	33.5 mm (1.3 in)
1920	113.8 mm (4.5 in)
1921	74.9 mm (2.9 in)
1922	90.9 mm (3.6 in)
1923	50.8 mm (2.0 in)
1924	49.0 mm (1.9 in)
1925	53.3 mm (2.1 in)
1926	50.8 mm (2.0 in)
1927	53.8 mm (2.1 in)
1928	61.2 mm (2.4 in)
1929	71.1 mm (2.8 in)
1930	35.1 mm (1.4 in)
1931	57.7 mm (2.3 in)
1932	80.0 mm (3.1 in)
1933	64.3 mm (2.5 in)
1934	45.7 mm (1.8 in)
1935	46.5 mm (1.8 in)
1936	59.4 mm (2.3 in)
1937	79.5 mm (3.1 in)
1938	50.3 mm (2.0 in)
1939	53.6 mm (2.1 in)
1940	76.2 mm (3.0 in)
1941	61.5 mm (2.4 in)
1942	56.6 mm (2.2 in)
1943	41.7 mm (1.6 in)
1944	42.2 mm (1.7 in)
1945	60.5 mm (2.4 in)
1946	43.9 mm (1.7 in)
1947	61.0 mm (2.4 in)
1948	47.5 mm (1.9 in)
1949	75.2 mm (3.0 in)
1950	55.9 mm (2.2 in)
1951	40.1 mm (1.6 in)
1952	55.1 mm (2.2 in)
1953	59.7 mm (2.4 in)
1954	87.6 mm (3.4 in)
1955	59.4 mm (2.3 in)
1956	58.7 mm (2.3 in)
1957	64.5 mm (2.5 in)
1958	85.3 mm (3.4 in)
1959	77.2 mm (3.0 in)
1960	55.1 mm (2.2 in)
1961	69.9 mm (2.8 in)
1962	35.1 mm (1.4 in)
1963	69.1 mm (2.7 in)
1964	64.8 mm (2.6 in)
1965	64.5 mm (2.5 in)
1966	41.7 mm (1.6 in)
1967	69.3 mm (2.7 in)
1968	55.9 mm (2.2 in)
1969	45.7 mm (1.8 in)
1970	69.9 mm (2.8 in)
1971	43.4 mm (1.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Hamilton, 1911 to 1971. The record is 188.1 mm (7.4 in) in 1958, marked on the chart; the median year is 95.4 mm (3.8 in).

Wettest five days (Rx5day) at Hamilton by year
Year	Wettest five days (Rx5day)
1911	49.0 mm (1.9 in)
1912	63.8 mm (2.5 in)
1913	182.9 mm (7.2 in)
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	77.3 mm (3.0 in)
1920	113.8 mm (4.5 in)
1921	92.2 mm (3.6 in)
1922	104.9 mm (4.1 in)
1923	71.2 mm (2.8 in)
1924	73.0 mm (2.9 in)
1925	88.1 mm (3.5 in)
1926	152.5 mm (6.0 in)
1927	103.4 mm (4.1 in)
1928	77.5 mm (3.1 in)
1929	102.9 mm (4.1 in)
1930	66.5 mm (2.6 in)
1931	108.9 mm (4.3 in)
1932	89.4 mm (3.5 in)
1933	129.3 mm (5.1 in)
1934	81.3 mm (3.2 in)
1935	66.3 mm (2.6 in)
1936	115.8 mm (4.6 in)
1937	169.9 mm (6.7 in)
1938	102.9 mm (4.1 in)
1939	103.9 mm (4.1 in)
1940	143.4 mm (5.6 in)
1941	68.1 mm (2.7 in)
1942	81.8 mm (3.2 in)
1943	110.0 mm (4.3 in)
1944	69.6 mm (2.7 in)
1945	122.0 mm (4.8 in)
1946	86.8 mm (3.4 in)
1947	86.9 mm (3.4 in)
1948	88.4 mm (3.5 in)
1949	103.6 mm (4.1 in)
1950	112.6 mm (4.4 in)
1951	61.0 mm (2.4 in)
1952	67.1 mm (2.6 in)
1953	143.5 mm (5.6 in)
1954	95.2 mm (3.7 in)
1955	107.9 mm (4.2 in)
1956	84.6 mm (3.3 in)
1957	122.7 mm (4.8 in)
1958	188.1 mm (7.4 in)
1959	153.4 mm (6.0 in)
1960	67.8 mm (2.7 in)
1961	124.5 mm (4.9 in)
1962	87.7 mm (3.5 in)
1963	95.5 mm (3.8 in)
1964	127.2 mm (5.0 in)
1965	93.8 mm (3.7 in)
1966	65.0 mm (2.6 in)
1967	70.3 mm (2.8 in)
1968	132.1 mm (5.2 in)
1969	101.9 mm (4.0 in)
1970	112.8 mm (4.4 in)
1971	69.3 mm (2.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Hamilton, 1911 to 1971. The record is 42 days in 1924, marked on the chart; the median year is 19 days.

Longest dry spell (CDD) at Hamilton by year
Year	Longest dry spell (CDD)
1911	6 days
1912	21 days
1913	11 days
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	14 days
1920	26 days
1921	16 days
1922	16 days
1923	16 days
1924	42 days
1925	16 days
1926	12 days
1927	18 days
1928	28 days
1929	19 days
1930	23 days
1931	17 days
1932	11 days
1933	19 days
1934	26 days
1935	18 days
1936	23 days
1937	14 days
1938	20 days
1939	27 days
1940	32 days
1941	19 days
1942	23 days
1943	19 days
1944	28 days
1945	16 days
1946	25 days
1947	19 days
1948	23 days
1949	16 days
1950	16 days
1951	19 days
1952	28 days
1953	24 days
1954	16 days
1955	18 days
1956	19 days
1957	23 days
1958	26 days
1959	16 days
1960	16 days
1961	13 days
1962	30 days
1963	27 days
1964	19 days
1965	15 days
1966	16 days
1967	20 days
1968	38 days
1969	17 days
1970	15 days
1971	13 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

48 years, 1912 to 1970

A day with at least 57.3 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 104.1 mm (4.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Hamilton: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	57.3 mm (2.3 in)
5 years	70.0 mm (2.8 in)
10 years	78.4 mm (3.1 in)
25 years	88.8 mm (3.5 in)
50 years	96.5 mm (3.8 in)	Longer than the 48 years of record
100 years	104.1 mm (4.1 in)	Longer than the 48 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, 48 years of values from 1912 to 1970.

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: 113.8 mm (4.5 in) in 1920; 87.6 mm (3.4 in) in 1954; 85.3 mm (3.4 in) in 1958.

Download the Data

Data for Hamilton standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hamilton 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 2026-10-15 (15 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).