Portsmouth US Grant Br Weather Records (USC00336786)

Record envelope, standing records and threshold days for Portsmouth US Grant Br (USC00336786), Ohio, United States, with 50 years of record.

Key Facts for Portsmouth US Grant Br

Portsmouth US Grant Br (USC00336786) is a weather station in Ohio, United States at 38.73 latitude and -83.00 longitude, 174 m (570 ft) above sea level.
The station reports from 1948 to 1997, 50 years of record.
2 records set at Portsmouth US Grant Br still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Portsmouth US Grant Br set a daily record precipitation of 39.9 mm (1.6 in) on 5 December 1996.

About the Station

Location: Ohio, United States, 38.73 latitude, -83.00 longitude.
Elevation: 174 m (570 ft).
Period of record: 1948 to 1997, 50 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 Portsmouth US Grant Br. 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 Portsmouth US Grant Br, 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	25.0 C (77.0 F)	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

2 standing records

2 records at Portsmouth US Grant Br still stand. 1953 holds the most, with 2.

Wettest Day of Each Month

Sep: 116.3 mm (4.6 in)

The wettest day on record for each calendar month at Portsmouth US Grant Br. The most was 116.3 mm (4.6 in) on 22 September 1950.

Record daily precipitation for each month at Portsmouth US Grant Br
Month	Record daily precipitation (mm)	Date
Jan	88.9 mm (3.5 in)	26 January 1982
Feb	59.7 mm (2.4 in)	1 February 1951
Mar	71.1 mm (2.8 in)	5 March 1964
Apr	64.8 mm (2.6 in)	22 April 1972
May	92.2 mm (3.6 in)	13 May 1970
Jun	83.1 mm (3.3 in)	21 June 1976
Jul	94.0 mm (3.7 in)	10 July 1955
Aug	73.4 mm (2.9 in)	10 August 1969
Sep	116.3 mm (4.6 in)	22 September 1950
Oct	64.8 mm (2.6 in)	7 October 1955
Nov	61.7 mm (2.4 in)	19 November 1957
Dec	54.4 mm (2.1 in)	13 December 1949

Period of Record Coverage

1953 to 1953

1 years of record at Portsmouth US Grant Br, 1953 to 1953. 1 years have data for under 90 percent of days and are left out of rankings: 1953.

Latest Records

Latest records at Portsmouth US Grant Br
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
5 December 1996	Portsmouth US Grant Br, US	daily rain	39.9 mm (1.6 in)	17.0 mm (0.7 in)	44 years	34 of 100 (Routine)
28 October 1996	Portsmouth US Grant Br, US	daily rain	22.9 mm (0.9 in)	9.4 mm (0.37 in)	24 years	20 of 100 (Routine)
27 October 1996	Portsmouth US Grant Br, US	daily rain (Tie)	22.9 mm (0.9 in)	tie	18 years	2 of 100 (Routine)
16 September 1996	Portsmouth US Grant Br, US	daily rain	29.7 mm (1.2 in)	7.1 mm (0.28 in)	19 years	13 of 100 (Routine)
21 August 1996	Portsmouth US Grant Br, US	daily rain	51.8 mm (2.0 in)	14.0 mm (0.6 in)	6 years	15 of 100 (Routine)
15 July 1996	Portsmouth US Grant Br, US	daily rain	68.1 mm (2.7 in)	29.5 mm (1.2 in)	10 years	32 of 100 (Routine)
28 May 1996	Portsmouth US Grant Br, US	daily rain	52.3 mm (2.1 in)	23.9 mm (0.9 in)	46 years	38 of 100 (Notable)
15 May 1996	Portsmouth US Grant Br, US	daily rain	75.4 mm (3.0 in)	35.3 mm (1.4 in)	1 year	35 of 100 (Notable)
6 May 1996	Portsmouth US Grant Br, US	daily rain	45.0 mm (1.8 in)	18.1 mm (0.7 in)	35 years	29 of 100 (Routine)
20 March 1996	Portsmouth US Grant Br, US	daily rain	10.7 mm (0.4 in)	0.3 mm (0.01 in)	42 years	16 of 100 (Routine)
24 January 1996	Portsmouth US Grant Br, US	daily rain	43.4 mm (1.7 in)	24.3 mm (1.0 in)	12 years	32 of 100 (Routine)
23 January 1996	Portsmouth US Grant Br, US	daily rain	23.4 mm (0.9 in)	1.8 mm (0.07 in)	29 years	13 of 100 (Routine)
8 January 1996	Portsmouth US Grant Br, US	daily rain	25.1 mm (1.0 in)	8.6 mm (0.34 in)	20 years	18 of 100 (Routine)
2 January 1996	Portsmouth US Grant Br, US	daily rain	47.0 mm (1.9 in)	15.2 mm (0.6 in)	29 years	27 of 100 (Routine)
19 December 1995	Portsmouth US Grant Br, US	daily rain	30.7 mm (1.2 in)	22.1 mm (0.9 in)	46 years	41 of 100 (Notable)
14 October 1995	Portsmouth US Grant Br, US	daily rain	24.4 mm (1.0 in)	6.6 mm (0.26 in)	0 years	11 of 100 (Routine)
13 October 1995	Portsmouth US Grant Br, US	daily rain	24.4 mm (1.0 in)	14.7 mm (0.6 in)	40 years	20 of 100 (Routine)
5 October 1995	Portsmouth US Grant Br, US	daily rain	19.8 mm (0.8 in)	7.9 mm (0.31 in)	16 years	16 of 100 (Routine)
17 May 1995	Portsmouth US Grant Br, US	daily rain	23.1 mm (0.9 in)	6.1 mm (0.24 in)	24 years	16 of 100 (Routine)
15 May 1995	Portsmouth US Grant Br, US	daily rain	40.1 mm (1.6 in)	2.8 mm (0.11 in)	8 years	8 of 100 (Routine)

Extremes by Year

1948 to 1997

Yearly extremes at Portsmouth US Grant Br: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	25.0 C (77.0 F)	1953	25.0 C (77.0 F)	1
Wettest day (Rx1day)	116.3 mm (4.6 in)	1950	53.0 mm (2.1 in)	50
Wettest five days (Rx5day)	162.7 mm (6.4 in)	1950	85.1 mm (3.3 in)	50
Longest dry spell (CDD)	44 days	1963	18 days	50

Hottest day (TXx)

The hottest day of the year at Portsmouth US Grant Br, 1948 to 1997. The record is 25.0 C (77.0 F) in 1953, marked on the chart; the median year is 25.0 C (77.0 F).

Hottest day (TXx) at Portsmouth US Grant Br by year
Year	Hottest day (TXx)
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	25.0 C (77.0 F)
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

Wettest day (Rx1day)

The wettest day of the year at Portsmouth US Grant Br, 1948 to 1997. The record is 116.3 mm (4.6 in) in 1950, marked on the chart; the median year is 53.0 mm (2.1 in).

Wettest day (Rx1day) at Portsmouth US Grant Br by year
Year	Wettest day (Rx1day)
1948	49.3 mm (1.9 in)
1949	69.9 mm (2.8 in)
1950	116.3 mm (4.6 in)
1951	59.7 mm (2.4 in)
1952	60.2 mm (2.4 in)
1953	60.2 mm (2.4 in)
1954	53.1 mm (2.1 in)
1955	94.0 mm (3.7 in)
1956	65.8 mm (2.6 in)
1957	61.7 mm (2.4 in)
1958	74.4 mm (2.9 in)
1959	36.8 mm (1.4 in)
1960	63.5 mm (2.5 in)
1961	72.9 mm (2.9 in)
1962	48.8 mm (1.9 in)
1963	48.3 mm (1.9 in)
1964	71.1 mm (2.8 in)
1965	80.8 mm (3.2 in)
1966	40.6 mm (1.6 in)
1967	54.6 mm (2.1 in)
1968	45.2 mm (1.8 in)
1969	73.4 mm (2.9 in)
1970	92.2 mm (3.6 in)
1971	50.8 mm (2.0 in)
1972	64.8 mm (2.6 in)
1973	50.8 mm (2.0 in)
1974	58.4 mm (2.3 in)
1975	78.7 mm (3.1 in)
1976	83.1 mm (3.3 in)
1977	52.8 mm (2.1 in)
1978	51.3 mm (2.0 in)
1979	71.1 mm (2.8 in)
1980	44.5 mm (1.8 in)
1981	50.8 mm (2.0 in)
1982	88.9 mm (3.5 in)
1983	40.1 mm (1.6 in)
1984	51.6 mm (2.0 in)
1985	34.0 mm (1.3 in)
1986	56.9 mm (2.2 in)
1987	37.3 mm (1.5 in)
1988	47.0 mm (1.9 in)
1989	29.0 mm (1.1 in)
1990	52.1 mm (2.1 in)
1991	45.2 mm (1.8 in)
1992	26.7 mm (1.1 in)
1993	29.2 mm (1.1 in)
1994	35.6 mm (1.4 in)
1995	40.1 mm (1.6 in)
1996	75.4 mm (3.0 in)
1997	19.3 mm (0.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Portsmouth US Grant Br, 1948 to 1997. The record is 162.7 mm (6.4 in) in 1950, marked on the chart; the median year is 85.1 mm (3.3 in).

Wettest five days (Rx5day) at Portsmouth US Grant Br by year
Year	Wettest five days (Rx5day)
1948	81.5 mm (3.2 in)
1949	97.5 mm (3.8 in)
1950	162.7 mm (6.4 in)
1951	107.2 mm (4.2 in)
1952	78.5 mm (3.1 in)
1953	84.5 mm (3.3 in)
1954	96.3 mm (3.8 in)
1955	120.4 mm (4.7 in)
1956	106.7 mm (4.2 in)
1957	62.7 mm (2.5 in)
1958	98.3 mm (3.9 in)
1959	69.6 mm (2.7 in)
1960	78.6 mm (3.1 in)
1961	118.4 mm (4.7 in)
1962	134.4 mm (5.3 in)
1963	70.6 mm (2.8 in)
1964	112.8 mm (4.4 in)
1965	95.3 mm (3.8 in)
1966	97.1 mm (3.8 in)
1967	85.6 mm (3.4 in)
1968	91.4 mm (3.6 in)
1969	74.6 mm (2.9 in)
1970	133.9 mm (5.3 in)
1971	66.3 mm (2.6 in)
1972	96.0 mm (3.8 in)
1973	78.7 mm (3.1 in)
1974	109.2 mm (4.3 in)
1975	106.4 mm (4.2 in)
1976	109.3 mm (4.3 in)
1977	95.0 mm (3.7 in)
1978	79.5 mm (3.1 in)
1979	117.4 mm (4.6 in)
1980	80.3 mm (3.2 in)
1981	66.5 mm (2.6 in)
1982	140.5 mm (5.5 in)
1983	104.9 mm (4.1 in)
1984	54.6 mm (2.1 in)
1985	49.0 mm (1.9 in)
1986	67.6 mm (2.7 in)
1987	45.4 mm (1.8 in)
1988	55.6 mm (2.2 in)
1989	38.1 mm (1.5 in)
1990	66.0 mm (2.6 in)
1991	64.0 mm (2.5 in)
1992	31.7 mm (1.2 in)
1993	30.5 mm (1.2 in)
1994	56.0 mm (2.2 in)
1995	106.2 mm (4.2 in)
1996	89.9 mm (3.5 in)
1997	35.6 mm (1.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Portsmouth US Grant Br, 1948 to 1997. The record is 44 days in 1963, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at Portsmouth US Grant Br by year
Year	Longest dry spell (CDD)
1948	17 days
1949	28 days
1950	16 days
1951	15 days
1952	23 days
1953	36 days
1954	13 days
1955	29 days
1956	16 days
1957	16 days
1958	18 days
1959	20 days
1960	12 days
1961	13 days
1962	14 days
1963	44 days
1964	19 days
1965	19 days
1966	20 days
1967	25 days
1968	17 days
1969	25 days
1970	14 days
1971	13 days
1972	15 days
1973	15 days
1974	14 days
1975	16 days
1976	22 days
1977	18 days
1978	18 days
1979	14 days
1980	14 days
1981	23 days
1982	16 days
1983	13 days
1984	13 days
1985	20 days
1986	21 days
1987	20 days
1988	11 days
1989	13 days
1990	18 days
1991	22 days
1992	20 days
1993	23 days
1994	18 days
1995	26 days
1996	13 days
1997	5 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

33 years, 1949 to 1987

A day with at least 61.2 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 120.3 mm (4.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Portsmouth US Grant Br: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	61.2 mm (2.4 in)
5 years	77.8 mm (3.1 in)
10 years	88.5 mm (3.5 in)
25 years	101.6 mm (4.0 in)
50 years	111.1 mm (4.4 in)	Longer than the 33 years of record
100 years	120.3 mm (4.7 in)	Longer than the 33 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, 33 years of values from 1949 to 1987.

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: 116.3 mm (4.6 in) in 1950; 94.0 mm (3.7 in) in 1955; 92.2 mm (3.6 in) in 1970.

Download the Data

Data for Portsmouth US Grant Br standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Portsmouth US Grant Br 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).