Stevenson Dam Weather Records (USC00068065)

Record envelope, standing records and threshold days for Stevenson Dam (USC00068065), Connecticut, United States, with 122 years of record.

Key Facts for Stevenson Dam

Stevenson Dam (USC00068065) is a weather station in Connecticut, United States at 41.38 latitude and -73.17 longitude, 35 m (115 ft) above sea level.
The station reports from 1893 to 2014, 122 years of record.
216 records set at Stevenson Dam still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Stevenson Dam set a daily record precipitation of 43.9 mm (1.7 in) on 8 June 2013.

About the Station

Location: Connecticut, United States, 41.38 latitude, -73.17 longitude.
Elevation: 35 m (115 ft).
Period of record: 1893 to 2014, 122 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 Stevenson 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 Stevenson Dam, 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	24.4 C (75.9 F)	-6.7 C (19.9 F)	n/a	n/a
Dec	11.7 C (53.1 F)	-17.8 C (0.0 F)	n/a	n/a

Which Years Hold Standing Records

216 standing records

216 records at Stevenson Dam still stand. 1980 holds the most, with 110.

All-Time Record Progression

1 new records

1 all-time records were set at Stevenson Dam between 6 June 1982 and 6 June 1982. Each dot is a new record.

Wettest Day of Each Month

Jun: 201.7 mm (7.9 in)

The wettest day on record for each calendar month at Stevenson Dam. The most was 201.7 mm (7.9 in) on 6 June 1982.

Record daily precipitation for each month at Stevenson Dam
Month	Record daily precipitation (mm)	Date
Jan	75.2 mm (3.0 in)	25 January 1979
Feb	67.8 mm (2.7 in)	3 February 1983
Mar	112.8 mm (4.4 in)	22 March 1980
Apr	127.3 mm (5.0 in)	10 April 1980
May	102.4 mm (4.0 in)	12 May 2006
Jun	201.7 mm (7.9 in)	6 June 1982
Jul	100.3 mm (3.9 in)	16 July 1992
Aug	150.9 mm (5.9 in)	28 August 1971
Sep	117.9 mm (4.6 in)	6 September 2008
Oct	167.1 mm (6.6 in)	16 October 1955
Nov	91.7 mm (3.6 in)	3 November 1954
Dec	106.7 mm (4.2 in)	31 December 1948

Period of Record Coverage

1980 to 1981

2 years of record at Stevenson Dam, 1980 to 1981. 2 years have data for under 90 percent of days and are left out of rankings: 1980, 1981.

Latest Records

Latest records at Stevenson Dam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
8 June 2013	Stevenson Dam, US	daily rain	43.9 mm (1.7 in)	16.0 mm (0.6 in)	48 years	34 of 100 (Routine)
20 October 2012	Stevenson Dam, US	daily rain	48.0 mm (1.9 in)	0.5 mm (0.02 in)	46 years	23 of 100 (Routine)
29 July 2012	Stevenson Dam, US	daily rain	42.2 mm (1.7 in)	6.6 mm (0.26 in)	43 years	27 of 100 (Routine)
7 September 2011	Stevenson Dam, US	daily rain	60.2 mm (2.4 in)	15.5 mm (0.6 in)	32 years	28 of 100 (Routine)
29 August 2011	Stevenson Dam, US	daily rain	62.0 mm (2.4 in)	35.1 mm (1.4 in)	117 years	61 of 100 (Major)
16 August 2011	Stevenson Dam, US	daily rain	49.3 mm (1.9 in)	16.8 mm (0.7 in)	8 years	22 of 100 (Routine)
15 August 2011	Stevenson Dam, US	daily rain	32.8 mm (1.3 in)	4.4 mm (0.17 in)	57 years	29 of 100 (Routine)
2 August 2011	Stevenson Dam, US	daily rain	30.2 mm (1.2 in)	4.8 mm (0.19 in)	48 years	26 of 100 (Routine)
9 July 2011	Stevenson Dam, US	daily rain	47.0 mm (1.9 in)	21.9 mm (0.9 in)	57 years	44 of 100 (Notable)
19 May 2011	Stevenson Dam, US	daily rain	76.2 mm (3.0 in)	42.2 mm (1.7 in)	34 years	51 of 100 (Notable)
13 January 2011	Stevenson Dam, US	daily rain	20.8 mm (0.8 in)	11.7 mm (0.5 in)	48 years	20 of 100 (Routine)
2 December 2010	Stevenson Dam, US	daily rain	56.6 mm (2.2 in)	9.4 mm (0.37 in)	28 years	24 of 100 (Routine)
17 November 2010	Stevenson Dam, US	daily rain	49.8 mm (2.0 in)	8.1 mm (0.32 in)	24 years	22 of 100 (Routine)
2 October 2010	Stevenson Dam, US	daily rain	71.9 mm (2.8 in)	30.8 mm (1.2 in)	28 years	33 of 100 (Routine)
1 October 2010	Stevenson Dam, US	daily rain	37.6 mm (1.5 in)	21.9 mm (0.9 in)	4 years	22 of 100 (Routine)
23 August 2010	Stevenson Dam, US	daily rain	59.9 mm (2.4 in)	39.3 mm (1.5 in)	0 years	34 of 100 (Routine)
30 March 2010	Stevenson Dam, US	daily rain	62.7 mm (2.5 in)	38.1 mm (1.5 in)	25 years	42 of 100 (Notable)
24 March 2010	Stevenson Dam, US	daily rain	36.1 mm (1.4 in)	10.7 mm (0.4 in)	16 years	22 of 100 (Routine)
26 February 2010	Stevenson Dam, US	daily rain	47.8 mm (1.9 in)	6.9 mm (0.27 in)	44 years	28 of 100 (Routine)
26 January 2010	Stevenson Dam, US	daily rain	57.4 mm (2.3 in)	5.8 mm (0.23 in)	24 years	21 of 100 (Routine)

Extremes by Year

1893 to 2014

Yearly extremes at Stevenson Dam: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	24.4 C (75.9 F)	1980	18.0 C (64.5 F)	2
Coldest night (TNn)	-17.8 C (0.0 F)	1981	-12.2 C (10.0 F)	2
Wettest day (Rx1day)	201.7 mm (7.9 in)	1982	76.0 mm (3.0 in)	60
Wettest five days (Rx5day)	255.3 mm (10.1 in)	1982	117.2 mm (4.6 in)	60
Longest dry spell (CDD)	28 days	1953	17 days	60

Hottest day (TXx)

The hottest day of the year at Stevenson Dam, 1893 to 2014. The record is 24.4 C (75.9 F) in 1980, marked on the chart; the median year is 18.0 C (64.5 F).

Hottest day (TXx) at Stevenson Dam by year
Year	Hottest day (TXx)
1893	n/a
1894	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	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	24.4 C (75.9 F)
1981	11.7 C (53.1 F)
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
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

Coldest night (TNn)

The coldest night of the year at Stevenson Dam, 1893 to 2014. The record is -17.8 C (0.0 F) in 1981, marked on the chart; the median year is -12.2 C (10.0 F).

Coldest night (TNn) at Stevenson Dam by year
Year	Coldest night (TNn)
1893	n/a
1894	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	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	-6.7 C (19.9 F)
1981	-17.8 C (0.0 F)
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
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

Wettest day (Rx1day)

The wettest day of the year at Stevenson Dam, 1893 to 2014. The record is 201.7 mm (7.9 in) in 1982, marked on the chart; the median year is 76.0 mm (3.0 in).

Wettest day (Rx1day) at Stevenson Dam by year
Year	Wettest day (Rx1day)
1893	86.1 mm (3.4 in)
1894	57.2 mm (2.3 in)
1948	106.7 mm (4.2 in)
1949	51.6 mm (2.0 in)
1950	53.3 mm (2.1 in)
1951	81.8 mm (3.2 in)
1952	78.7 mm (3.1 in)
1953	71.4 mm (2.8 in)
1954	91.7 mm (3.6 in)
1955	167.1 mm (6.6 in)
1956	40.6 mm (1.6 in)
1957	53.1 mm (2.1 in)
1958	63.0 mm (2.5 in)
1959	56.1 mm (2.2 in)
1960	108.0 mm (4.3 in)
1961	50.8 mm (2.0 in)
1962	57.2 mm (2.3 in)
1963	75.7 mm (3.0 in)
1964	35.1 mm (1.4 in)
1965	54.9 mm (2.2 in)
1966	69.6 mm (2.7 in)
1967	54.1 mm (2.1 in)
1968	78.0 mm (3.1 in)
1969	62.5 mm (2.5 in)
1970	52.3 mm (2.1 in)
1971	150.9 mm (5.9 in)
1972	78.0 mm (3.1 in)
1973	83.6 mm (3.3 in)
1974	84.3 mm (3.3 in)
1975	69.3 mm (2.7 in)
1976	79.0 mm (3.1 in)
1977	93.0 mm (3.7 in)
1978	54.9 mm (2.2 in)
1979	82.6 mm (3.3 in)
1980	127.3 mm (5.0 in)
1981	50.3 mm (2.0 in)
1982	201.7 mm (7.9 in)
1983	96.3 mm (3.8 in)
1984	75.2 mm (3.0 in)
1985	48.3 mm (1.9 in)
1986	89.4 mm (3.5 in)
1987	99.1 mm (3.9 in)
1988	73.2 mm (2.9 in)
1989	93.2 mm (3.7 in)
1990	110.0 mm (4.3 in)
1991	110.5 mm (4.4 in)
1992	105.4 mm (4.1 in)
1993	61.2 mm (2.4 in)
2003	68.6 mm (2.7 in)
2004	86.1 mm (3.4 in)
2005	145.3 mm (5.7 in)
2006	118.9 mm (4.7 in)
2007	82.3 mm (3.2 in)
2008	117.9 mm (4.6 in)
2009	61.0 mm (2.4 in)
2010	71.9 mm (2.8 in)
2011	76.2 mm (3.0 in)
2012	48.0 mm (1.9 in)
2013	43.9 mm (1.7 in)
2014	10.9 mm (0.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Stevenson Dam, 1893 to 2014. The record is 255.3 mm (10.1 in) in 1982, marked on the chart; the median year is 117.2 mm (4.6 in).

Wettest five days (Rx5day) at Stevenson Dam by year
Year	Wettest five days (Rx5day)
1893	118.8 mm (4.7 in)
1894	61.8 mm (2.4 in)
1948	133.1 mm (5.2 in)
1949	185.2 mm (7.3 in)
1950	75.0 mm (3.0 in)
1951	120.4 mm (4.7 in)
1952	117.8 mm (4.6 in)
1953	171.0 mm (6.7 in)
1954	124.8 mm (4.9 in)
1955	250.2 mm (9.9 in)
1956	67.9 mm (2.7 in)
1957	75.2 mm (3.0 in)
1958	139.2 mm (5.5 in)
1959	87.6 mm (3.4 in)
1960	143.8 mm (5.7 in)
1961	69.8 mm (2.7 in)
1962	70.7 mm (2.8 in)
1963	113.0 mm (4.4 in)
1964	53.9 mm (2.1 in)
1965	67.1 mm (2.6 in)
1966	70.9 mm (2.8 in)
1967	79.0 mm (3.1 in)
1968	108.2 mm (4.3 in)
1969	113.1 mm (4.5 in)
1970	99.3 mm (3.9 in)
1971	190.8 mm (7.5 in)
1972	155.5 mm (6.1 in)
1973	195.6 mm (7.7 in)
1974	107.2 mm (4.2 in)
1975	161.2 mm (6.3 in)
1976	114.8 mm (4.5 in)
1977	120.2 mm (4.7 in)
1978	85.9 mm (3.4 in)
1979	172.0 mm (6.8 in)
1980	146.1 mm (5.8 in)
1981	125.0 mm (4.9 in)
1982	255.3 mm (10.1 in)
1983	132.0 mm (5.2 in)
1984	219.9 mm (8.7 in)
1985	69.4 mm (2.7 in)
1986	128.8 mm (5.1 in)
1987	156.7 mm (6.2 in)
1988	107.0 mm (4.2 in)
1989	172.9 mm (6.8 in)
1990	111.5 mm (4.4 in)
1991	151.1 mm (5.9 in)
1992	111.8 mm (4.4 in)
1993	94.8 mm (3.7 in)
2003	107.7 mm (4.2 in)
2004	88.4 mm (3.5 in)
2005	217.8 mm (8.6 in)
2006	133.6 mm (5.3 in)
2007	126.8 mm (5.0 in)
2008	145.1 mm (5.7 in)
2009	79.3 mm (3.1 in)
2010	146.1 mm (5.8 in)
2011	116.6 mm (4.6 in)
2012	55.7 mm (2.2 in)
2013	67.5 mm (2.7 in)
2014	12.0 mm (0.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Stevenson Dam, 1893 to 2014. The record is 28 days in 1953, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Stevenson Dam by year
Year	Longest dry spell (CDD)
1893	14 days
1894	12 days
1948	27 days
1949	20 days
1950	25 days
1951	12 days
1952	19 days
1953	28 days
1954	17 days
1955	17 days
1956	15 days
1957	19 days
1958	20 days
1959	12 days
1960	16 days
1961	16 days
1962	14 days
1963	28 days
1964	23 days
1965	16 days
1966	26 days
1967	16 days
1968	26 days
1969	17 days
1970	17 days
1971	17 days
1972	11 days
1973	15 days
1974	15 days
1975	19 days
1976	17 days
1977	16 days
1978	19 days
1979	12 days
1980	23 days
1981	24 days
1982	17 days
1983	23 days
1984	20 days
1985	20 days
1986	15 days
1987	15 days
1988	14 days
1989	15 days
1990	23 days
1991	23 days
1992	20 days
1993	18 days
2003	14 days
2004	28 days
2005	15 days
2006	17 days
2007	20 days
2008	15 days
2009	16 days
2010	21 days
2011	17 days
2012	24 days
2013	19 days
2014	7 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

51 years, 1949 to 2012

A day with at least 74.9 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 206.1 mm (8.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Stevenson 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	74.9 mm (2.9 in)
5 years	103.6 mm (4.1 in)
10 years	124.9 mm (4.9 in)
25 years	154.9 mm (6.1 in)
50 years	179.5 mm (7.1 in)
100 years	206.1 mm (8.1 in)	Longer than the 51 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, 51 years of values from 1949 to 2012.

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: 201.7 mm (7.9 in) in 1982; 167.1 mm (6.6 in) in 1955; 150.9 mm (5.9 in) in 1971.

Download the Data

Data for Stevenson Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Stevenson 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 2026-10-14 (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).