Brighton Dam Weather Records (USC00181125)

Record envelope, standing records and threshold days for Brighton Dam (USC00181125), Maryland, United States, with 70 years of record.

Key Facts for Brighton Dam

Brighton Dam (USC00181125) is a weather station in Maryland, United States at 39.19 latitude and -77.01 longitude, 101 m (330 ft) above sea level.
The station reports from 1948 to 2017, 70 years of record.
1,464 records set at Brighton Dam still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Brighton Dam set a daily record precipitation of 31.8 mm (1.3 in) on 24 July 2017.

About the Station

Location: Maryland, United States, 39.19 latitude, -77.01 longitude.
Elevation: 101 m (330 ft).
Period of record: 1948 to 2017, 70 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 Brighton Dam. 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 Brighton Dam, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	26.1 C (79.0 F)	-17.2 C (1.0 F)	n/a	n/a
Feb	25.6 C (78.1 F)	-19.4 C (-2.9 F)	n/a	n/a
Mar	28.3 C (82.9 F)	-17.2 C (1.0 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-7.2 C (19.0 F)	n/a	n/a
May	33.3 C (91.9 F)	0.0 C (32.0 F)	n/a	n/a
Jun	37.8 C (100.0 F)	2.8 C (37.0 F)	n/a	n/a
Jul	38.9 C (102.0 F)	7.2 C (45.0 F)	n/a	n/a
Aug	37.2 C (99.0 F)	6.1 C (43.0 F)	n/a	n/a
Sep	37.8 C (100.0 F)	0.0 C (32.0 F)	n/a	n/a
Oct	32.2 C (90.0 F)	-6.1 C (21.0 F)	n/a	n/a
Nov	29.4 C (84.9 F)	-11.7 C (10.9 F)	n/a	n/a
Dec	22.8 C (73.0 F)	-20.6 C (-5.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Brighton Dam still stand. 1949 holds the most, with 137.

All-Time Record Progression

4 new records

4 all-time records were set at Brighton Dam between 19 February 1979 and 23 January 2016. Each dot is a new record.

When Brighton Dam set new all-time records
Date	Kind	Detail
1979-02-19	Record daily snowfall	Record daily snowfall 40.6 cm (16.0 in)
1979-02-19	Record snow depth	Record snow depth 58.4 cm (23.0 in)
2010-02-06	Record daily snowfall	Record daily snowfall 50.8 cm (20.0 in)
2016-01-23	Record daily snowfall	Record daily snowfall 71.1 cm (28.0 in)

Wettest Day of Each Month

Jun: 237.7 mm (9.4 in)

The wettest day on record for each calendar month at Brighton Dam. The most was 237.7 mm (9.4 in) on 22 June 1972.

Record daily precipitation for each month at Brighton Dam
Month	Record daily precipitation (mm)	Date
Jan	50.8 mm (2.0 in)	23 January 2016
Feb	67.1 mm (2.6 in)	11 February 1983
Mar	77.5 mm (3.1 in)	20 March 1958
Apr	62.2 mm (2.4 in)	15 April 1983
May	109.2 mm (4.3 in)	1 May 2014
Jun	237.7 mm (9.4 in)	22 June 1972
Jul	133.9 mm (5.3 in)	21 July 1956
Aug	90.2 mm (3.6 in)	28 August 2011
Sep	126.2 mm (5.0 in)	5 September 1979
Oct	91.4 mm (3.6 in)	23 October 1990
Nov	71.1 mm (2.8 in)	7 November 1963
Dec	97.3 mm (3.8 in)	18 December 1977

Period of Record Coverage

1948 to 2017

17 years of record at Brighton Dam, 1948 to 2017. 8 years have data for under 90 percent of days and are left out of rankings: 1948, 1970, 1971, 1972, 1978, 2012, 2013, 2017.

Days with data per year at Brighton Dam
Year	Days with data	Share of year	Complete
1948	31	8%	No
1949	364	100%	Yes
1950	331	91%	Yes
1951	365	100%	Yes
1952	365	100%	Yes
1953	362	99%	Yes
1954	347	95%	Yes
1970	46	13%	No
1971	86	24%	No
1972	59	16%	No
1978	1	0%	No
2012	300	82%	No
2013	295	81%	No
2014	357	98%	Yes
2015	351	96%	Yes
2016	352	96%	Yes
2017	240	66%	No

Latest Records

Latest records at Brighton Dam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
24 July 2017	Brighton Dam, US	daily rain	31.8 mm (1.3 in)	14.5 mm (0.6 in)	55 years	32 of 100 (Routine)
14 March 2017	Brighton Dam, US	daily snowfall	6.6 cm (2.6 in)	6.6 cm (2.6 in)	68 years	40 of 100 (Notable)
14 March 2017	Brighton Dam, US	daily snow depth (Tie)	7.6 cm (3.0 in)	tie	59 years	6 of 100 (Routine)
29 September 2016	Brighton Dam, US	daily rain	63.5 mm (2.5 in)	17.5 mm (0.7 in)	53 years	30 of 100 (Routine)
16 August 2016	Brighton Dam, US	daily rain	32.5 mm (1.3 in)	20.1 mm (0.8 in)	62 years	38 of 100 (Notable)
29 July 2016	Brighton Dam, US	daily rain	80.8 mm (3.2 in)	61.0 mm (2.4 in)	65 years	65 of 100 (Major)
5 July 2016	Brighton Dam, US	daily rain	38.1 mm (1.5 in)	13.0 mm (0.5 in)	60 years	33 of 100 (Routine)
21 May 2016	Brighton Dam, US	daily rain	21.6 mm (0.9 in)	3.8 mm (0.15 in)	33 years	18 of 100 (Routine)
7 May 2016	Brighton Dam, US	daily rain	49.5 mm (1.9 in)	10.9 mm (0.4 in)	63 years	32 of 100 (Routine)
2 May 2016	Brighton Dam, US	daily rain	25.4 mm (1.0 in)	11.7 mm (0.5 in)	55 years	31 of 100 (Routine)
25 February 2016	Brighton Dam, US	daily rain	46.2 mm (1.8 in)	17.8 mm (0.7 in)	36 years	36 of 100 (Notable)
23 January 2016	Brighton Dam, US	all-time snowfall	71.1 cm (28.0 in)	20.3 cm (8.0 in)	5 years	59 of 100 (Notable)
23 January 2016	Brighton Dam, US	monthly rain	50.8 mm (2.0 in)	10.2 mm (0.4 in)	29 years	36 of 100 (Notable)
16 January 2016	Brighton Dam, US	daily rain	15.2 mm (0.6 in)	1.2 mm (0.05 in)	61 years	20 of 100 (Routine)
10 January 2016	Brighton Dam, US	daily rain	25.4 mm (1.0 in)	0.5 mm (0.02 in)	52 years	21 of 100 (Routine)
26 December 2015	Brighton Dam, US	daily rain	39.4 mm (1.6 in)	2.3 mm (0.09 in)	45 years	21 of 100 (Routine)
13 November 2015	Brighton Dam, US	daily rain	30.5 mm (1.2 in)	16.8 mm (0.7 in)	2 years	19 of 100 (Routine)
7 July 2015	Brighton Dam, US	daily rain	33.0 mm (1.3 in)	22.1 mm (0.9 in)	38 years	32 of 100 (Routine)
28 June 2015	Brighton Dam, US	daily rain	53.3 mm (2.1 in)	16.7 mm (0.7 in)	46 years	30 of 100 (Routine)
24 June 2015	Brighton Dam, US	daily rain	33.8 mm (1.3 in)	3.3 mm (0.13 in)	50 years	22 of 100 (Routine)

Extremes by Year

1948 to 2017

Yearly extremes at Brighton Dam: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.9 C (102.0 F)	1954	34.4 C (93.9 F)	17
Coldest night (TNn)	-20.6 C (-5.1 F)	1951	-14.4 C (6.1 F)	16
Wettest day (Rx1day)	237.7 mm (9.4 in)	1972	69.4 mm (2.7 in)	54
Wettest five days (Rx5day)	287.3 mm (11.3 in)	1975	93.9 mm (3.7 in)	54
Longest dry spell (CDD)	31 days	1963	18 days	54

Hottest day (TXx)

The hottest day of the year at Brighton Dam, 1948 to 2017. The record is 38.9 C (102.0 F) in 1954, marked on the chart; the median year is 34.4 C (93.9 F).

Hottest day (TXx) at Brighton Dam by year
Year	Hottest day (TXx)
1948	18.9 C (66.0 F)
1949	38.3 C (100.9 F)
1950	33.3 C (91.9 F)
1951	35.0 C (95.0 F)
1952	36.1 C (97.0 F)
1953	37.8 C (100.0 F)
1954	38.9 C (102.0 F)
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	27.2 C (81.0 F)
1971	21.1 C (70.0 F)
1972	31.1 C (88.0 F)
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	-2.8 C (27.0 F)
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
2007	n/a
2009	n/a
2010	n/a
2011	n/a
2012	37.8 C (100.0 F)
2013	35.0 C (95.0 F)
2014	34.4 C (93.9 F)
2015	33.3 C (91.9 F)
2016	35.6 C (96.1 F)
2017	34.4 C (93.9 F)

Coldest night (TNn)

The coldest night of the year at Brighton Dam, 1948 to 2017. The record is -20.6 C (-5.1 F) in 1951, marked on the chart; the median year is -14.4 C (6.1 F).

Coldest night (TNn) at Brighton Dam by year
Year	Coldest night (TNn)
1948	-17.2 C (1.0 F)
1949	-14.4 C (6.1 F)
1950	-15.6 C (3.9 F)
1951	-20.6 C (-5.1 F)
1952	-14.4 C (6.1 F)
1953	-12.2 C (10.0 F)
1954	-17.2 C (1.0 F)
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	-12.2 C (10.0 F)
1971	-16.1 C (3.0 F)
1972	-9.4 C (15.1 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
2007	n/a
2009	n/a
2010	n/a
2011	n/a
2012	-9.4 C (15.1 F)
2013	-8.9 C (16.0 F)
2014	-17.2 C (1.0 F)
2015	-19.4 C (-2.9 F)
2016	-14.4 C (6.1 F)
2017	-12.8 C (9.0 F)

Wettest day (Rx1day)

The wettest day of the year at Brighton Dam, 1948 to 2017. The record is 237.7 mm (9.4 in) in 1972, marked on the chart; the median year is 69.4 mm (2.7 in).

Wettest day (Rx1day) at Brighton Dam by year
Year	Wettest day (Rx1day)
1948	48.8 mm (1.9 in)
1949	40.4 mm (1.6 in)
1950	78.2 mm (3.1 in)
1951	53.6 mm (2.1 in)
1952	64.8 mm (2.6 in)
1953	90.4 mm (3.6 in)
1954	45.2 mm (1.8 in)
1955	83.3 mm (3.3 in)
1956	133.9 mm (5.3 in)
1957	61.0 mm (2.4 in)
1958	77.5 mm (3.1 in)
1959	75.7 mm (3.0 in)
1960	63.2 mm (2.5 in)
1961	48.8 mm (1.9 in)
1962	53.3 mm (2.1 in)
1963	71.1 mm (2.8 in)
1964	43.2 mm (1.7 in)
1965	75.4 mm (3.0 in)
1966	109.5 mm (4.3 in)
1967	67.8 mm (2.7 in)
1968	40.9 mm (1.6 in)
1969	51.3 mm (2.0 in)
1970	66.0 mm (2.6 in)
1971	71.4 mm (2.8 in)
1972	237.7 mm (9.4 in)
1973	73.4 mm (2.9 in)
1974	64.3 mm (2.5 in)
1975	112.3 mm (4.4 in)
1976	72.1 mm (2.8 in)
1977	97.3 mm (3.8 in)
1978	57.4 mm (2.3 in)
1979	126.2 mm (5.0 in)
1980	54.4 mm (2.1 in)
1981	54.6 mm (2.1 in)
1982	50.8 mm (2.0 in)
1983	76.2 mm (3.0 in)
1984	57.7 mm (2.3 in)
1985	88.9 mm (3.5 in)
1986	58.4 mm (2.3 in)
1987	101.6 mm (4.0 in)
1988	88.9 mm (3.5 in)
1989	78.7 mm (3.1 in)
1990	91.4 mm (3.6 in)
1991	38.1 mm (1.5 in)
2007	22.1 mm (0.9 in)
2009	40.6 mm (1.6 in)
2010	91.4 mm (3.6 in)
2011	90.2 mm (3.6 in)
2012	36.1 mm (1.4 in)
2013	64.8 mm (2.6 in)
2014	109.2 mm (4.3 in)
2015	61.7 mm (2.4 in)
2016	80.8 mm (3.2 in)
2017	76.2 mm (3.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Brighton Dam, 1948 to 2017. The record is 287.3 mm (11.3 in) in 1975, marked on the chart; the median year is 93.9 mm (3.7 in).

Wettest five days (Rx5day) at Brighton Dam by year
Year	Wettest five days (Rx5day)
1948	69.9 mm (2.8 in)
1949	80.3 mm (3.2 in)
1950	147.6 mm (5.8 in)
1951	112.3 mm (4.4 in)
1952	158.8 mm (6.3 in)
1953	113.3 mm (4.5 in)
1954	62.5 mm (2.5 in)
1955	93.0 mm (3.7 in)
1956	163.9 mm (6.5 in)
1957	81.7 mm (3.2 in)
1958	120.0 mm (4.7 in)
1959	87.2 mm (3.4 in)
1960	94.7 mm (3.7 in)
1961	82.1 mm (3.2 in)
1962	65.0 mm (2.6 in)
1963	103.7 mm (4.1 in)
1964	70.0 mm (2.8 in)
1965	79.2 mm (3.1 in)
1966	164.9 mm (6.5 in)
1967	89.9 mm (3.5 in)
1968	78.5 mm (3.1 in)
1969	69.1 mm (2.7 in)
1970	77.8 mm (3.1 in)
1971	111.4 mm (4.4 in)
1972	279.8 mm (11.0 in)
1973	78.0 mm (3.1 in)
1974	77.2 mm (3.0 in)
1975	287.3 mm (11.3 in)
1976	92.4 mm (3.6 in)
1977	125.5 mm (4.9 in)
1978	120.1 mm (4.7 in)
1979	130.8 mm (5.1 in)
1980	54.9 mm (2.2 in)
1981	76.9 mm (3.0 in)
1982	85.1 mm (3.4 in)
1983	97.7 mm (3.8 in)
1984	91.4 mm (3.6 in)
1985	98.3 mm (3.9 in)
1986	64.3 mm (2.5 in)
1987	150.2 mm (5.9 in)
1988	139.6 mm (5.5 in)
1989	128.3 mm (5.1 in)
1990	104.1 mm (4.1 in)
1991	55.9 mm (2.2 in)
2007	34.0 mm (1.3 in)
2009	83.8 mm (3.3 in)
2010	137.3 mm (5.4 in)
2011	177.6 mm (7.0 in)
2012	65.9 mm (2.6 in)
2013	145.5 mm (5.7 in)
2014	161.3 mm (6.4 in)
2015	130.6 mm (5.1 in)
2016	119.4 mm (4.7 in)
2017	76.2 mm (3.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Brighton Dam, 1948 to 2017. The record is 31 days in 1963, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at Brighton Dam by year
Year	Longest dry spell (CDD)
1948	16 days
1949	18 days
1950	16 days
1951	15 days
1952	29 days
1953	20 days
1954	24 days
1955	22 days
1956	14 days
1957	18 days
1958	25 days
1959	15 days
1960	19 days
1961	15 days
1962	25 days
1963	31 days
1964	26 days
1965	15 days
1966	20 days
1967	23 days
1968	25 days
1969	18 days
1970	14 days
1971	16 days
1972	13 days
1973	15 days
1974	19 days
1975	21 days
1976	15 days
1977	30 days
1978	16 days
1979	16 days
1980	17 days
1981	24 days
1982	16 days
1983	21 days
1984	22 days
1985	27 days
1986	20 days
1987	26 days
1988	29 days
1989	25 days
1990	22 days
1991	13 days
2007	19 days
2009	14 days
2010	18 days
2011	15 days
2012	16 days
2013	15 days
2014	12 days
2015	18 days
2016	14 days
2017	15 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, 1949 to 2016

A day with at least 69.8 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 192.0 mm (7.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Brighton Dam: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	69.8 mm (2.7 in)
5 years	94.1 mm (3.7 in)
10 years	113.1 mm (4.5 in)
25 years	141.1 mm (5.6 in)
50 years	165.0 mm (6.5 in)	Longer than the 48 years of record
100 years	192.0 mm (7.6 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 1949 to 2016.

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: 237.7 mm (9.4 in) in 1972; 133.9 mm (5.3 in) in 1956; 126.2 mm (5.0 in) in 1979.

Download the Data

Data for Brighton Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Brighton Dam 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 2026-10-13 (13 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).