Ottawa Weather Records (USC00336342)

Record envelope, standing records and threshold days for Ottawa (USC00336342), Ohio, United States, with 79 years of record.

Key Facts for Ottawa

Ottawa (USC00336342) is a weather station in Ohio, United States at 41.03 latitude and -84.05 longitude, 223 m (730 ft) above sea level.
The station reports from 1948 to 2026, 79 years of record.
276 records set at Ottawa still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Ottawa set a daily record precipitation of 35.8 mm (1.4 in) on 10 August 2026.

About the Station

Location: Ohio, United States, 41.03 latitude, -84.05 longitude.
Elevation: 223 m (730 ft).
Period of record: 1948 to 2026, 79 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 Ottawa. 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 Ottawa, 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	23.3 C (73.9 F)	-6.1 C (21.0 F)	n/a	n/a
Nov	15.0 C (59.0 F)	-10.0 C (14.0 F)	n/a	n/a
Dec	18.3 C (64.9 F)	-16.1 C (3.0 F)	n/a	n/a

Which Years Hold Standing Records

276 standing records

276 records at Ottawa still stand. 1967 holds the most, with 224.

All-Time Record Progression

2 new records

2 all-time records were set at Ottawa between 8 July 1997 and 19 August 2007. Each dot is a new record.

When Ottawa set new all-time records
Date	Kind	Detail
1997-07-08	Record daily precipitation	Record daily precipitation 124.7 mm (4.9 in)
2007-08-19	Record daily precipitation	Record daily precipitation 206.8 mm (8.1 in)

Wettest Day of Each Month

Aug: 206.8 mm (8.1 in)

The wettest day on record for each calendar month at Ottawa. The most was 206.8 mm (8.1 in) on 19 August 2007.

Record daily precipitation for each month at Ottawa
Month	Record daily precipitation (mm)	Date
Jan	48.0 mm (1.9 in)	6 January 2007
Feb	62.2 mm (2.4 in)	26 February 1997
Mar	55.9 mm (2.2 in)	4 March 1976
Apr	71.9 mm (2.8 in)	11 April 2013
May	77.2 mm (3.0 in)	24 May 1997
Jun	105.7 mm (4.2 in)	14 June 1981
Jul	124.7 mm (4.9 in)	8 July 1997
Aug	206.8 mm (8.1 in)	19 August 2007
Sep	95.5 mm (3.8 in)	13 September 2008
Oct	82.6 mm (3.3 in)	5 October 1995
Nov	63.8 mm (2.5 in)	18 November 2017
Dec	66.0 mm (2.6 in)	21 December 2013

Period of Record Coverage

1952 to 1967

2 years of record at Ottawa, 1952 to 1967. 2 years have data for under 90 percent of days and are left out of rankings: 1952, 1967.

Latest Records

Latest records at Ottawa
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
10 August 2026	Ottawa, US	daily rain	35.8 mm (1.4 in)	13.2 mm (0.5 in)	47 years	29 of 100 (Routine)
27 April 2026	Ottawa, US	daily rain	28.7 mm (1.1 in)	13.2 mm (0.5 in)	20 years	28 of 100 (Routine)
1 April 2026	Ottawa, US	daily rain (Tie)	22.9 mm (0.9 in)	tie	1 year	1 of 100 (Routine)
31 March 2026	Ottawa, US	daily rain	53.3 mm (2.1 in)	29.9 mm (1.2 in)	40 years	56 of 100 (Notable)
26 March 2026	Ottawa, US	daily rain	30.5 mm (1.2 in)	5.6 mm (0.22 in)	76 years	37 of 100 (Notable)
30 January 2026	Ottawa, US	daily snow depth	15.2 cm (6.0 in)	5.0 cm (2.0 in)	40 years	24 of 100 (Routine)
29 January 2026	Ottawa, US	daily snow depth (Tie)	15.2 cm (6.0 in)	tie	40 years	4 of 100 (Routine)
28 January 2026	Ottawa, US	daily snow depth (Tie)	17.8 cm (7.0 in)	tie	40 years	4 of 100 (Routine)
27 January 2026	Ottawa, US	daily snow depth	17.8 cm (7.0 in)	2.6 cm (1.0 in)	56 years	25 of 100 (Routine)
25 January 2026	Ottawa, US	daily snowfall	20.3 cm (8.0 in)	7.6 cm (3.0 in)	34 years	36 of 100 (Notable)
13 December 2025	Ottawa, US	daily snow depth (Tie)	5.1 cm (2.0 in)	tie	30 years	4 of 100 (Routine)
13 December 2025	Ottawa, US	daily snowfall (Tie)	5.1 cm (2.0 in)	tie	12 years	2 of 100 (Routine)
8 December 2025	Ottawa, US	daily snow depth	5.1 cm (2.0 in)	5.1 cm (2.0 in)	56 years	20 of 100 (Routine)
7 December 2025	Ottawa, US	daily snow depth	7.6 cm (3.0 in)	7.6 cm (3.0 in)	56 years	20 of 100 (Routine)
7 December 2025	Ottawa, US	daily snowfall	2.5 cm (1.0 in)	2.0 cm (0.8 in)	36 years	20 of 100 (Routine)
4 December 2025	Ottawa, US	daily snow depth	7.6 cm (3.0 in)	7.6 cm (3.0 in)	56 years	20 of 100 (Routine)
1 December 2025	Ottawa, US	daily snowfall	7.6 cm (3.0 in)	6.3 cm (2.5 in)	46 years	33 of 100 (Routine)
29 November 2025	Ottawa, US	monthly snowfall	10.2 cm (4.0 in)	2.1 cm (0.8 in)	39 years	37 of 100 (Notable)
29 November 2025	Ottawa, US	monthly snow depth (Tie)	7.6 cm (3.0 in)	tie	28 years	6 of 100 (Routine)
9 November 2025	Ottawa, US	daily snow depth	5.1 cm (2.0 in)	5.1 cm (2.0 in)	76 years	20 of 100 (Routine)

Extremes by Year

1948 to 2026

Yearly extremes at Ottawa: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	23.3 C (73.9 F)	1952	20.8 C (69.4 F)	2
Coldest night (TNn)	-16.1 C (3.0 F)	1967	-11.1 C (12.0 F)	2
Wettest day (Rx1day)	206.8 mm (8.1 in)	2007	52.8 mm (2.1 in)	65
Wettest five days (Rx5day)	230.2 mm (9.1 in)	2007	86.6 mm (3.4 in)	65
Longest dry spell (CDD)	45 days	2006	17 days	65

Hottest day (TXx)

The hottest day of the year at Ottawa, 1948 to 2026. The record is 23.3 C (73.9 F) in 1952, marked on the chart; the median year is 20.8 C (69.4 F).

Hottest day (TXx) at Ottawa by year
Year	Hottest day (TXx)
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	23.3 C (73.9 F)
1967	18.3 C (64.9 F)
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 Ottawa, 1948 to 2026. The record is -16.1 C (3.0 F) in 1967, marked on the chart; the median year is -11.1 C (12.0 F).

Coldest night (TNn) at Ottawa by year
Year	Coldest night (TNn)
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	-6.1 C (21.0 F)
1967	-16.1 C (3.0 F)
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

Wettest day (Rx1day)

The wettest day of the year at Ottawa, 1948 to 2026. The record is 206.8 mm (8.1 in) in 2007, marked on the chart; the median year is 52.8 mm (2.1 in).

Wettest day (Rx1day) at Ottawa by year
Year	Wettest day (Rx1day)
1948	31.8 mm (1.3 in)
1949	39.1 mm (1.5 in)
1950	61.2 mm (2.4 in)
1951	49.3 mm (1.9 in)
1952	30.5 mm (1.2 in)
1967	43.9 mm (1.7 in)
1968	58.7 mm (2.3 in)
1969	62.2 mm (2.4 in)
1970	32.0 mm (1.3 in)
1971	60.5 mm (2.4 in)
1972	89.4 mm (3.5 in)
1973	50.8 mm (2.0 in)
1974	66.0 mm (2.6 in)
1975	71.1 mm (2.8 in)
1976	55.9 mm (2.2 in)
1977	60.5 mm (2.4 in)
1978	53.6 mm (2.1 in)
1979	40.9 mm (1.6 in)
1980	53.3 mm (2.1 in)
1981	105.7 mm (4.2 in)
1982	50.8 mm (2.0 in)
1983	63.2 mm (2.5 in)
1984	27.4 mm (1.1 in)
1985	39.4 mm (1.6 in)
1986	48.3 mm (1.9 in)
1987	80.0 mm (3.1 in)
1988	38.6 mm (1.5 in)
1989	52.8 mm (2.1 in)
1990	88.9 mm (3.5 in)
1991	52.1 mm (2.1 in)
1992	45.7 mm (1.8 in)
1993	37.6 mm (1.5 in)
1994	46.7 mm (1.8 in)
1995	82.6 mm (3.3 in)
1996	47.5 mm (1.9 in)
1997	124.7 mm (4.9 in)
1998	65.8 mm (2.6 in)
1999	35.3 mm (1.4 in)
2000	38.1 mm (1.5 in)
2001	40.1 mm (1.6 in)
2002	39.6 mm (1.6 in)
2003	39.4 mm (1.6 in)
2004	47.2 mm (1.9 in)
2005	45.7 mm (1.8 in)
2006	57.2 mm (2.3 in)
2007	206.8 mm (8.1 in)
2008	95.5 mm (3.8 in)
2009	36.1 mm (1.4 in)
2010	36.3 mm (1.4 in)
2011	58.4 mm (2.3 in)
2012	45.0 mm (1.8 in)
2013	71.9 mm (2.8 in)
2014	78.7 mm (3.1 in)
2015	50.8 mm (2.0 in)
2016	105.4 mm (4.1 in)
2017	63.8 mm (2.5 in)
2018	61.5 mm (2.4 in)
2019	59.9 mm (2.4 in)
2020	55.9 mm (2.2 in)
2021	88.9 mm (3.5 in)
2022	59.2 mm (2.3 in)
2023	44.5 mm (1.8 in)
2024	47.5 mm (1.9 in)
2025	38.1 mm (1.5 in)
2026	53.3 mm (2.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ottawa, 1948 to 2026. The record is 230.2 mm (9.1 in) in 2007, marked on the chart; the median year is 86.6 mm (3.4 in).

Wettest five days (Rx5day) at Ottawa by year
Year	Wettest five days (Rx5day)
1948	35.6 mm (1.4 in)
1949	110.6 mm (4.4 in)
1950	85.4 mm (3.4 in)
1951	61.0 mm (2.4 in)
1952	50.8 mm (2.0 in)
1967	51.6 mm (2.0 in)
1968	101.3 mm (4.0 in)
1969	73.4 mm (2.9 in)
1970	71.9 mm (2.8 in)
1971	69.4 mm (2.7 in)
1972	114.3 mm (4.5 in)
1973	78.0 mm (3.1 in)
1974	99.8 mm (3.9 in)
1975	91.0 mm (3.6 in)
1976	76.2 mm (3.0 in)
1977	122.9 mm (4.8 in)
1978	73.4 mm (2.9 in)
1979	62.7 mm (2.5 in)
1980	87.3 mm (3.4 in)
1981	123.2 mm (4.9 in)
1982	102.1 mm (4.0 in)
1983	109.5 mm (4.3 in)
1984	64.8 mm (2.6 in)
1985	67.3 mm (2.6 in)
1986	118.2 mm (4.7 in)
1987	84.6 mm (3.3 in)
1988	88.6 mm (3.5 in)
1989	68.4 mm (2.7 in)
1990	179.3 mm (7.1 in)
1991	58.2 mm (2.3 in)
1992	93.6 mm (3.7 in)
1993	44.1 mm (1.7 in)
1994	83.6 mm (3.3 in)
1995	107.0 mm (4.2 in)
1996	42.7 mm (1.7 in)
1997	129.1 mm (5.1 in)
1998	100.3 mm (3.9 in)
1999	52.3 mm (2.1 in)
2000	56.9 mm (2.2 in)
2001	64.3 mm (2.5 in)
2002	92.6 mm (3.6 in)
2003	114.6 mm (4.5 in)
2004	128.0 mm (5.0 in)
2005	86.8 mm (3.4 in)
2006	84.1 mm (3.3 in)
2007	230.2 mm (9.1 in)
2008	125.9 mm (5.0 in)
2009	100.9 mm (4.0 in)
2010	57.4 mm (2.3 in)
2011	110.5 mm (4.4 in)
2012	90.3 mm (3.6 in)
2013	86.6 mm (3.4 in)
2014	79.5 mm (3.1 in)
2015	101.1 mm (4.0 in)
2016	108.4 mm (4.3 in)
2017	94.7 mm (3.7 in)
2018	86.9 mm (3.4 in)
2019	71.6 mm (2.8 in)
2020	84.6 mm (3.3 in)
2021	110.5 mm (4.4 in)
2022	78.3 mm (3.1 in)
2023	67.1 mm (2.6 in)
2024	68.3 mm (2.7 in)
2025	71.1 mm (2.8 in)
2026	104.7 mm (4.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Ottawa, 1948 to 2026. The record is 45 days in 2006, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Ottawa by year
Year	Longest dry spell (CDD)
1948	11 days
1949	21 days
1950	20 days
1951	14 days
1952	16 days
1967	27 days
1968	17 days
1969	27 days
1970	21 days
1971	13 days
1972	13 days
1973	16 days
1974	17 days
1975	16 days
1976	25 days
1977	31 days
1978	16 days
1979	16 days
1980	17 days
1981	16 days
1982	10 days
1983	26 days
1984	14 days
1985	15 days
1986	10 days
1987	28 days
1988	17 days
1989	17 days
1990	14 days
1991	15 days
1992	8 days
1993	10 days
1994	2 days
1995	20 days
1996	6 days
1997	4 days
1998	27 days
1999	24 days
2000	13 days
2001	19 days
2002	20 days
2003	19 days
2004	14 days
2005	24 days
2006	45 days
2007	21 days
2008	27 days
2009	18 days
2010	18 days
2011	18 days
2012	19 days
2013	23 days
2014	11 days
2015	18 days
2016	15 days
2017	14 days
2018	14 days
2019	20 days
2020	14 days
2021	16 days
2022	17 days
2023	22 days
2024	16 days
2025	17 days
2026	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

52 years, 1950 to 2025

A day with at least 53.3 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 162.3 mm (6.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Ottawa: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	53.3 mm (2.1 in)
5 years	73.3 mm (2.9 in)
10 years	89.5 mm (3.5 in)
25 years	114.4 mm (4.5 in)
50 years	136.6 mm (5.4 in)
100 years	162.3 mm (6.4 in)	Longer than the 52 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, 52 years of values from 1950 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: 206.8 mm (8.1 in) in 2007; 105.7 mm (4.2 in) in 1981; 105.4 mm (4.1 in) in 2016.

Download the Data

Data for Ottawa standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ottawa 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 2026-10-12 (12 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).