Ripogenus Dam Weather Records (USC00177174)

Record envelope, standing records and threshold days for Ripogenus Dam (USC00177174), Maine, United States, with 71 years of record.

Key Facts for Ripogenus Dam

Ripogenus Dam (USC00177174) is a weather station in Maine, United States at 45.88 latitude and -69.18 longitude, 290 m (952 ft) above sea level.
The station reports from 1925 to 1995, 71 years of record.
1,464 records set at Ripogenus Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Ripogenus Dam tied a daily record low minimum temperature of -20.6 C (-5.1 F) on 30 November 1995.

About the Station

Location: Maine, United States, 45.88 latitude, -69.18 longitude.
Elevation: 290 m (952 ft).
Period of record: 1925 to 1995, 71 years.
Eligible elements: tmax, tmin, 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 Ripogenus 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 Ripogenus Dam, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	14.4 C (57.9 F)	-37.8 C (-36.0 F)	n/a	n/a
Feb	17.2 C (63.0 F)	-41.1 C (-42.0 F)	n/a	n/a
Mar	22.8 C (73.0 F)	-33.3 C (-27.9 F)	n/a	n/a
Apr	26.7 C (80.1 F)	-27.2 C (-17.0 F)	n/a	n/a
May	32.2 C (90.0 F)	-8.3 C (17.1 F)	n/a	n/a
Jun	35.6 C (96.1 F)	-3.9 C (25.0 F)	n/a	n/a
Jul	36.1 C (97.0 F)	2.8 C (37.0 F)	n/a	n/a
Aug	37.2 C (99.0 F)	-3.9 C (25.0 F)	n/a	n/a
Sep	34.4 C (93.9 F)	-6.7 C (19.9 F)	n/a	n/a
Oct	29.4 C (84.9 F)	-9.4 C (15.1 F)	n/a	n/a
Nov	23.3 C (73.9 F)	-21.1 C (-6.0 F)	n/a	n/a
Dec	17.8 C (64.0 F)	-36.7 C (-34.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Ripogenus Dam still stand. 1936 holds the most, with 35.

Standing records at Ripogenus Dam by the year they were set
Year set	Standing records
1925	15
1926	16
1927	12
1928	16
1929	12
1930	18
1931	20
1932	15
1933	29
1934	31
1935	23
1936	35
1937	29
1938	26
1939	28
1940	11
1941	17
1942	24
1943	17
1944	23
1945	21
1946	22
1947	26
1948	19
1949	34
1950	24
1951	16
1952	18
1953	34
1954	19
1955	17
1956	24
1957	22
1958	14
1959	19
1960	12
1961	14
1962	17
1963	25
1964	23
1965	22
1966	21
1967	16
1968	19
1969	21
1970	20
1971	16
1972	27
1973	16
1974	25
1975	14
1976	30
1977	18
1978	17
1979	33
1980	16
1981	23
1982	28
1983	17
1984	16
1985	13
1986	22
1987	14
1988	18
1989	20
1990	14
1991	19
1992	25
1993	23
1994	24
1995	20

Wettest Day of Each Month

Sep: 196.1 mm (7.7 in)

The wettest day on record for each calendar month at Ripogenus Dam. The most was 196.1 mm (7.7 in) on 16 September 1932.

Record daily precipitation for each month at Ripogenus Dam
Month	Record daily precipitation (mm)	Date
Jan	43.2 mm (1.7 in)	1 January 1973
Feb	67.3 mm (2.6 in)	4 February 1947
Mar	47.0 mm (1.9 in)	13 March 1936
Apr	68.6 mm (2.7 in)	12 April 1940
May	70.1 mm (2.8 in)	28 May 1927
Jun	74.7 mm (2.9 in)	28 June 1943
Jul	74.9 mm (2.9 in)	16 July 1978
Aug	80.0 mm (3.1 in)	20 August 1991
Sep	196.1 mm (7.7 in)	16 September 1932
Oct	95.3 mm (3.8 in)	4 October 1970
Nov	97.5 mm (3.8 in)	26 November 1950
Dec	80.0 mm (3.1 in)	18 December 1973

Period of Record Coverage

1925 to 1995

71 years of record at Ripogenus Dam, 1925 to 1995. 4 years have data for under 90 percent of days and are left out of rankings: 1925, 1983, 1984, 1995.

Days with data per year at Ripogenus Dam
Year	Days with data	Share of year	Complete
1925	184	50%	No
1926	329	90%	Yes
1927	330	90%	Yes
1928	363	99%	Yes
1929	361	99%	Yes
1930	358	98%	Yes
1931	360	99%	Yes
1932	361	99%	Yes
1933	362	99%	Yes
1934	364	100%	Yes
1935	363	99%	Yes
1936	364	99%	Yes
1937	364	100%	Yes
1938	363	99%	Yes
1939	363	99%	Yes
1940	365	100%	Yes
1941	365	100%	Yes
1942	358	98%	Yes
1943	360	99%	Yes
1944	364	99%	Yes
1945	362	99%	Yes
1946	364	100%	Yes
1947	361	99%	Yes
1948	362	99%	Yes
1949	364	100%	Yes
1950	330	90%	Yes
1951	361	99%	Yes
1952	351	96%	Yes
1953	356	98%	Yes
1954	363	99%	Yes
1955	364	100%	Yes
1956	366	100%	Yes
1957	364	100%	Yes
1958	364	100%	Yes
1959	334	92%	Yes
1960	365	100%	Yes
1961	364	100%	Yes
1962	364	100%	Yes
1963	362	99%	Yes
1964	366	100%	Yes
1965	363	99%	Yes
1966	364	100%	Yes
1967	363	99%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	364	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	364	100%	Yes
1982	362	99%	Yes
1983	302	83%	No
1984	284	78%	No
1985	356	98%	Yes
1986	364	100%	Yes
1987	364	100%	Yes
1988	364	99%	Yes
1989	362	99%	Yes
1990	365	100%	Yes
1991	363	99%	Yes
1992	366	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	272	75%	No

Latest Records

Latest records at Ripogenus Dam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 November 1995	Ripogenus Dam, US	daily low min (Tie)	-20.6 C (-5.1 F)	tie	65 years	6 of 100 (Routine)
29 November 1995	Ripogenus Dam, US	daily snow depth	15.2 cm (6.0 in)	10.1 cm (4.0 in)	5 years	20 of 100 (Routine)
28 November 1995	Ripogenus Dam, US	daily snow depth	15.2 cm (6.0 in)	10.1 cm (4.0 in)	5 years	20 of 100 (Routine)
27 November 1995	Ripogenus Dam, US	daily snow depth	10.2 cm (4.0 in)	2.6 cm (1.0 in)	5 years	11 of 100 (Routine)
20 November 1995	Ripogenus Dam, US	daily snowfall	15.2 cm (6.0 in)	7.6 cm (3.0 in)	57 years	39 of 100 (Notable)
20 November 1995	Ripogenus Dam, US	daily snow depth	15.2 cm (6.0 in)	10.1 cm (4.0 in)	4 years	20 of 100 (Routine)
10 November 1995	Ripogenus Dam, US	daily low min (Tie)	-11.7 C (10.9 F)	tie	29 years	3 of 100 (Routine)
8 November 1995	Ripogenus Dam, US	daily rain	35.1 mm (1.4 in)	5.1 mm (0.20 in)	52 years	27 of 100 (Routine)
29 October 1995	Ripogenus Dam, US	daily rain	51.8 mm (2.0 in)	26.9 mm (1.1 in)	41 years	45 of 100 (Notable)
22 October 1995	Ripogenus Dam, US	daily high min	12.8 C (55.0 F)	4.5 C (8.1 F)	16 years	22 of 100 (Routine)
15 October 1995	Ripogenus Dam, US	daily rain	30.7 mm (1.2 in)	12.9 mm (0.5 in)	33 years	29 of 100 (Routine)
18 July 1995	Ripogenus Dam, US	daily low max	15.6 C (60.1 F)	1.1 C (2.0 F)	60 years	27 of 100 (Routine)
18 July 1995	Ripogenus Dam, US	monthly low min (Tie)	2.8 C (37.0 F)	tie	30 years	6 of 100 (Routine)
1 July 1995	Ripogenus Dam, US	daily high max	32.8 C (91.0 F)	0.6 C (1.1 F)	52 years	23 of 100 (Routine)
26 June 1995	Ripogenus Dam, US	daily high max	33.9 C (93.0 F)	1.1 C (2.0 F)	48 years	23 of 100 (Routine)
25 June 1995	Ripogenus Dam, US	daily high max	33.3 C (91.9 F)	1.6 C (2.9 F)	32 years	19 of 100 (Routine)
21 June 1995	Ripogenus Dam, US	daily low min (Tie)	3.9 C (39.0 F)	tie	68 years	6 of 100 (Routine)
20 June 1995	Ripogenus Dam, US	daily high max	32.8 C (91.0 F)	2.2 C (4.0 F)	41 years	23 of 100 (Routine)
3 June 1995	Ripogenus Dam, US	daily high max	30.6 C (87.1 F)	0.6 C (1.1 F)	32 years	17 of 100 (Routine)
2 June 1995	Ripogenus Dam, US	daily high max	30.0 C (86.0 F)	0.6 C (1.1 F)	57 years	25 of 100 (Routine)

Climate Trend

60 complete years, 1928 to 1994

One stripe for each of 60 complete years at Ripogenus Dam, 1928 to 1994. Blue stripes are years cooler than the station's own mean of 4.1 C (39.4 F); red stripes are warmer. The coolest year was 1972, at 2.9 C (37.2 F), and the warmest was 1953, at 6.2 C (43.2 F). The strongest colour marks a difference of 2.1 C (3.8 F).

Annual mean temperature at Ripogenus Dam as warming stripes, 1928 to 1994
Year	Annual mean temperature	Difference from the station mean
1928	3.8 C	-0.30 C
1929	4.6 C	+0.45 C
1930	4.8 C	+0.61 C
1931	5.0 C	+0.87 C
1932	5.1 C	+0.98 C
1933	4.1 C	-0.06 C
1934	3.4 C	-0.74 C
1935	3.5 C	-0.62 C
1936	3.5 C	-0.69 C
1937	5.5 C	+1.40 C
1938	4.9 C	+0.79 C
1939	3.8 C	-0.33 C
1940	4.2 C	+0.02 C
1941	4.7 C	+0.53 C
1942	5.2 C	+1.01 C
1943	3.4 C	-0.75 C
1944	5.0 C	+0.90 C
1946	5.1 C	+0.98 C
1947	5.0 C	+0.85 C
1949	5.3 C	+1.11 C
1951	4.7 C	+0.54 C
1952	5.5 C	+1.40 C
1953	6.2 C	+2.09 C
1954	4.3 C	+0.20 C
1955	4.3 C	+0.12 C
1956	3.6 C	-0.57 C
1957	4.6 C	+0.50 C
1958	4.3 C	+0.12 C
1960	5.0 C	+0.84 C
1961	4.6 C	+0.43 C
1962	2.9 C	-1.20 C
1963	3.5 C	-0.62 C
1964	3.9 C	-0.20 C
1965	3.0 C	-1.10 C
1966	4.2 C	+0.04 C
1967	3.4 C	-0.72 C
1968	3.7 C	-0.45 C
1969	4.0 C	-0.10 C
1970	3.7 C	-0.43 C
1971	3.9 C	-0.29 C
1972	2.9 C	-1.27 C
1973	5.0 C	+0.86 C
1974	3.3 C	-0.83 C
1975	4.1 C	-0.03 C
1976	3.2 C	-0.98 C
1977	3.8 C	-0.34 C
1978	3.1 C	-1.01 C
1979	4.5 C	+0.34 C
1980	3.2 C	-0.92 C
1981	4.6 C	+0.50 C
1982	3.5 C	-0.61 C
1986	3.7 C	-0.46 C
1987	4.5 C	+0.33 C
1988	4.1 C	-0.02 C
1989	3.1 C	-1.04 C
1990	4.9 C	+0.77 C
1991	4.4 C	+0.21 C
1992	3.1 C	-1.05 C
1993	2.9 C	-1.20 C
1994	3.0 C	-1.11 C

The annual mean temperature here has fallen by 0.2 C (0.1 to 0.3) per decade over 1928 to 1994. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 60 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Ripogenus Dam
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.2 C (-0.3 to -0.1) per decade	-0.3 F (-0.5 to -0.1) per decade	1928 to 1994	60	Fall
Mean daily maximum	-0.2 C (-0.3 to -0.1) per decade	-0.4 F (-0.6 to -0.2) per decade	1928 to 1994	60	Fall
Mean daily minimum	-0.11 C (-0.23 to 0.00) per decade	-0.21 F (-0.41 to 0.00) per decade	1928 to 1994	60	Not clearly different from zero

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1925 to 1995

Yearly extremes at Ripogenus Dam: 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)	1935	32.2 C (90.0 F)	71
Coldest night (TNn)	-41.1 C (-42.0 F)	1934	-31.7 C (-25.1 F)	71
Wettest day (Rx1day)	196.1 mm (7.7 in)	1932	50.8 mm (2.0 in)	71
Wettest five days (Rx5day)	180.3 mm (7.1 in)	1981	78.5 mm (3.1 in)	71
Longest dry spell (CDD)	24 days	1926	15 days	71

Hottest day (TXx)

The hottest day of the year at Ripogenus Dam, 1925 to 1995. The record is 37.2 C (99.0 F) in 1935, marked on the chart; the median year is 32.2 C (90.0 F).

Hottest day (TXx) at Ripogenus Dam by year
Year	Hottest day (TXx)
1925	29.4 C (84.9 F)
1926	29.4 C (84.9 F)
1927	30.0 C (86.0 F)
1928	32.8 C (91.0 F)
1929	32.2 C (90.0 F)
1930	33.3 C (91.9 F)
1931	32.8 C (91.0 F)
1932	32.2 C (90.0 F)
1933	33.3 C (91.9 F)
1934	30.6 C (87.1 F)
1935	37.2 C (99.0 F)
1936	32.2 C (90.0 F)
1937	34.4 C (93.9 F)
1938	33.9 C (93.0 F)
1939	32.2 C (90.0 F)
1940	31.1 C (88.0 F)
1941	32.2 C (90.0 F)
1942	33.3 C (91.9 F)
1943	33.9 C (93.0 F)
1944	35.6 C (96.1 F)
1945	32.2 C (90.0 F)
1946	33.3 C (91.9 F)
1947	35.0 C (95.0 F)
1948	33.3 C (91.9 F)
1949	35.6 C (96.1 F)
1950	31.7 C (89.1 F)
1951	32.2 C (90.0 F)
1952	37.2 C (99.0 F)
1953	36.1 C (97.0 F)
1954	30.6 C (87.1 F)
1955	35.0 C (95.0 F)
1956	32.2 C (90.0 F)
1957	31.7 C (89.1 F)
1958	31.1 C (88.0 F)
1959	33.3 C (91.9 F)
1960	33.3 C (91.9 F)
1961	32.2 C (90.0 F)
1962	30.6 C (87.1 F)
1963	32.8 C (91.0 F)
1964	32.8 C (91.0 F)
1965	31.7 C (89.1 F)
1966	30.6 C (87.1 F)
1967	31.7 C (89.1 F)
1968	32.8 C (91.0 F)
1969	32.8 C (91.0 F)
1970	32.2 C (90.0 F)
1971	31.7 C (89.1 F)
1972	31.1 C (88.0 F)
1973	31.1 C (88.0 F)
1974	31.7 C (89.1 F)
1975	36.1 C (97.0 F)
1976	31.7 C (89.1 F)
1977	32.2 C (90.0 F)
1978	32.2 C (90.0 F)
1979	30.6 C (87.1 F)
1980	30.0 C (86.0 F)
1981	30.0 C (86.0 F)
1982	31.1 C (88.0 F)
1983	31.7 C (89.1 F)
1984	31.1 C (88.0 F)
1985	30.0 C (86.0 F)
1986	31.7 C (89.1 F)
1987	33.9 C (93.0 F)
1988	34.4 C (93.9 F)
1989	32.8 C (91.0 F)
1990	32.2 C (90.0 F)
1991	35.0 C (95.0 F)
1992	31.1 C (88.0 F)
1993	32.2 C (90.0 F)
1994	33.9 C (93.0 F)
1995	33.9 C (93.0 F)

Coldest night (TNn)

The coldest night of the year at Ripogenus Dam, 1925 to 1995. The record is -41.1 C (-42.0 F) in 1934, marked on the chart; the median year is -31.7 C (-25.1 F).

Coldest night (TNn) at Ripogenus Dam by year
Year	Coldest night (TNn)
1925	-28.3 C (-18.9 F)
1926	-28.9 C (-20.0 F)
1927	-32.8 C (-27.0 F)
1928	-31.1 C (-24.0 F)
1929	-29.4 C (-20.9 F)
1930	-35.0 C (-31.0 F)
1931	-30.6 C (-23.1 F)
1932	-27.8 C (-18.0 F)
1933	-36.7 C (-34.1 F)
1934	-41.1 C (-42.0 F)
1935	-33.3 C (-27.9 F)
1936	-31.1 C (-24.0 F)
1937	-26.7 C (-16.1 F)
1938	-33.3 C (-27.9 F)
1939	-29.4 C (-20.9 F)
1940	-28.3 C (-18.9 F)
1941	-26.7 C (-16.1 F)
1942	-32.2 C (-26.0 F)
1943	-33.3 C (-27.9 F)
1944	-29.4 C (-20.9 F)
1945	-31.7 C (-25.1 F)
1946	-31.7 C (-25.1 F)
1947	-27.2 C (-17.0 F)
1948	-34.4 C (-29.9 F)
1949	-30.6 C (-23.1 F)
1950	-30.0 C (-22.0 F)
1951	-31.7 C (-25.1 F)
1952	-30.6 C (-23.1 F)
1953	-25.0 C (-13.0 F)
1954	-28.3 C (-18.9 F)
1955	-32.8 C (-27.0 F)
1956	-30.0 C (-22.0 F)
1957	-35.0 C (-31.0 F)
1958	-28.9 C (-20.0 F)
1959	-29.4 C (-20.9 F)
1960	-28.9 C (-20.0 F)
1961	-31.7 C (-25.1 F)
1962	-35.6 C (-32.1 F)
1963	-32.2 C (-26.0 F)
1964	-26.7 C (-16.1 F)
1965	-31.7 C (-25.1 F)
1966	-35.0 C (-31.0 F)
1967	-37.2 C (-35.0 F)
1968	-34.4 C (-29.9 F)
1969	-28.9 C (-20.0 F)
1970	-33.3 C (-27.9 F)
1971	-34.4 C (-29.9 F)
1972	-35.0 C (-31.0 F)
1973	-31.1 C (-24.0 F)
1974	-32.2 C (-26.0 F)
1975	-32.2 C (-26.0 F)
1976	-35.6 C (-32.1 F)
1977	-31.7 C (-25.1 F)
1978	-29.4 C (-20.9 F)
1979	-33.3 C (-27.9 F)
1980	-32.2 C (-26.0 F)
1981	-34.4 C (-29.9 F)
1982	-33.3 C (-27.9 F)
1983	-31.7 C (-25.1 F)
1984	-33.9 C (-29.0 F)
1985	-27.8 C (-18.0 F)
1986	-31.7 C (-25.1 F)
1987	-31.7 C (-25.1 F)
1988	-31.1 C (-24.0 F)
1989	-34.4 C (-29.9 F)
1990	-28.9 C (-20.0 F)
1991	-32.8 C (-27.0 F)
1992	-30.0 C (-22.0 F)
1993	-35.0 C (-31.0 F)
1994	-36.7 C (-34.1 F)
1995	-37.8 C (-36.0 F)

Wettest day (Rx1day)

The wettest day of the year at Ripogenus Dam, 1925 to 1995. The record is 196.1 mm (7.7 in) in 1932, marked on the chart; the median year is 50.8 mm (2.0 in).

Wettest day (Rx1day) at Ripogenus Dam by year
Year	Wettest day (Rx1day)
1925	66.8 mm (2.6 in)
1926	35.1 mm (1.4 in)
1927	78.7 mm (3.1 in)
1928	40.1 mm (1.6 in)
1929	39.6 mm (1.6 in)
1930	44.5 mm (1.8 in)
1931	74.2 mm (2.9 in)
1932	196.1 mm (7.7 in)
1933	43.7 mm (1.7 in)
1934	41.9 mm (1.6 in)
1935	52.8 mm (2.1 in)
1936	50.8 mm (2.0 in)
1937	62.0 mm (2.4 in)
1938	66.5 mm (2.6 in)
1939	49.8 mm (2.0 in)
1940	68.6 mm (2.7 in)
1941	45.7 mm (1.8 in)
1942	52.1 mm (2.1 in)
1943	74.7 mm (2.9 in)
1944	53.3 mm (2.1 in)
1945	50.8 mm (2.0 in)
1946	74.9 mm (2.9 in)
1947	67.3 mm (2.6 in)
1948	47.8 mm (1.9 in)
1949	38.4 mm (1.5 in)
1950	97.5 mm (3.8 in)
1951	48.5 mm (1.9 in)
1952	56.9 mm (2.2 in)
1953	52.8 mm (2.1 in)
1954	69.9 mm (2.8 in)
1955	52.1 mm (2.1 in)
1956	32.0 mm (1.3 in)
1957	50.8 mm (2.0 in)
1958	39.4 mm (1.6 in)
1959	51.3 mm (2.0 in)
1960	71.1 mm (2.8 in)
1961	49.5 mm (1.9 in)
1962	57.2 mm (2.3 in)
1963	50.8 mm (2.0 in)
1964	57.2 mm (2.3 in)
1965	38.6 mm (1.5 in)
1966	57.4 mm (2.3 in)
1967	44.5 mm (1.8 in)
1968	29.2 mm (1.1 in)
1969	48.3 mm (1.9 in)
1970	95.3 mm (3.8 in)
1971	36.1 mm (1.4 in)
1972	78.7 mm (3.1 in)
1973	80.0 mm (3.1 in)
1974	42.2 mm (1.7 in)
1975	37.3 mm (1.5 in)
1976	52.8 mm (2.1 in)
1977	45.7 mm (1.8 in)
1978	74.9 mm (2.9 in)
1979	40.1 mm (1.6 in)
1980	24.9 mm (1.0 in)
1981	101.6 mm (4.0 in)
1982	50.3 mm (2.0 in)
1983	64.0 mm (2.5 in)
1984	40.6 mm (1.6 in)
1985	35.6 mm (1.4 in)
1986	43.9 mm (1.7 in)
1987	46.2 mm (1.8 in)
1988	38.1 mm (1.5 in)
1989	50.8 mm (2.0 in)
1990	42.7 mm (1.7 in)
1991	80.0 mm (3.1 in)
1992	59.7 mm (2.4 in)
1993	60.2 mm (2.4 in)
1994	40.4 mm (1.6 in)
1995	51.8 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ripogenus Dam, 1925 to 1995. The record is 180.3 mm (7.1 in) in 1981, marked on the chart; the median year is 78.5 mm (3.1 in).

Wettest five days (Rx5day) at Ripogenus Dam by year
Year	Wettest five days (Rx5day)
1925	99.0 mm (3.9 in)
1926	62.0 mm (2.4 in)
1927	95.5 mm (3.8 in)
1928	67.7 mm (2.7 in)
1929	54.6 mm (2.1 in)
1930	58.7 mm (2.3 in)
1931	86.9 mm (3.4 in)
1932	67.8 mm (2.7 in)
1933	72.2 mm (2.8 in)
1934	80.6 mm (3.2 in)
1935	71.4 mm (2.8 in)
1936	81.6 mm (3.2 in)
1937	109.2 mm (4.3 in)
1938	82.4 mm (3.2 in)
1939	72.7 mm (2.9 in)
1940	129.8 mm (5.1 in)
1941	66.5 mm (2.6 in)
1942	77.0 mm (3.0 in)
1943	129.5 mm (5.1 in)
1944	90.4 mm (3.6 in)
1945	87.2 mm (3.4 in)
1946	75.7 mm (3.0 in)
1947	101.6 mm (4.0 in)
1948	90.2 mm (3.6 in)
1949	59.0 mm (2.3 in)
1950	148.6 mm (5.9 in)
1951	77.2 mm (3.0 in)
1952	74.5 mm (2.9 in)
1953	81.0 mm (3.2 in)
1954	96.3 mm (3.8 in)
1955	70.2 mm (2.8 in)
1956	55.6 mm (2.2 in)
1957	71.2 mm (2.8 in)
1958	58.2 mm (2.3 in)
1959	92.4 mm (3.6 in)
1960	83.5 mm (3.3 in)
1961	80.5 mm (3.2 in)
1962	92.3 mm (3.6 in)
1963	119.5 mm (4.7 in)
1964	157.1 mm (6.2 in)
1965	57.2 mm (2.3 in)
1966	79.8 mm (3.1 in)
1967	74.6 mm (2.9 in)
1968	55.9 mm (2.2 in)
1969	80.6 mm (3.2 in)
1970	108.0 mm (4.3 in)
1971	56.2 mm (2.2 in)
1972	87.1 mm (3.4 in)
1973	117.1 mm (4.6 in)
1974	47.3 mm (1.9 in)
1975	59.6 mm (2.3 in)
1976	73.4 mm (2.9 in)
1977	68.0 mm (2.7 in)
1978	78.4 mm (3.1 in)
1979	62.7 mm (2.5 in)
1980	56.6 mm (2.2 in)
1981	180.3 mm (7.1 in)
1982	65.6 mm (2.6 in)
1983	101.6 mm (4.0 in)
1984	121.7 mm (4.8 in)
1985	45.8 mm (1.8 in)
1986	83.8 mm (3.3 in)
1987	69.3 mm (2.7 in)
1988	64.5 mm (2.5 in)
1989	74.7 mm (2.9 in)
1990	67.1 mm (2.6 in)
1991	89.6 mm (3.5 in)
1992	91.5 mm (3.6 in)
1993	89.9 mm (3.5 in)
1994	78.5 mm (3.1 in)
1995	80.3 mm (3.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Ripogenus Dam, 1925 to 1995. The record is 24 days in 1926, marked on the chart; the median year is 15 days.

Longest dry spell (CDD) at Ripogenus Dam by year
Year	Longest dry spell (CDD)
1925	9 days
1926	24 days
1927	21 days
1928	15 days
1929	14 days
1930	15 days
1931	10 days
1932	18 days
1933	11 days
1934	16 days
1935	21 days
1936	11 days
1937	19 days
1938	14 days
1939	17 days
1940	12 days
1941	19 days
1942	18 days
1943	15 days
1944	15 days
1945	16 days
1946	16 days
1947	15 days
1948	16 days
1949	13 days
1950	18 days
1951	15 days
1952	20 days
1953	14 days
1954	13 days
1955	19 days
1956	19 days
1957	15 days
1958	11 days
1959	11 days
1960	13 days
1961	24 days
1962	13 days
1963	18 days
1964	14 days
1965	18 days
1966	14 days
1967	11 days
1968	18 days
1969	15 days
1970	15 days
1971	12 days
1972	13 days
1973	10 days
1974	13 days
1975	14 days
1976	13 days
1977	14 days
1978	15 days
1979	18 days
1980	23 days
1981	12 days
1982	17 days
1983	13 days
1984	12 days
1985	19 days
1986	15 days
1987	20 days
1988	16 days
1989	15 days
1990	9 days
1991	11 days
1992	13 days
1993	10 days
1994	15 days
1995	16 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.

Frost Dates and Growing Season

60 years with a frost

Across 60 years with a frost, the median last spring frost at Ripogenus Dam falls on 20 May and the median first autumn frost on 26 September, which leaves a median of 128 days between them.

In 1962 to 1994 the median growing season was 128 days. That is 1 day fewer than in 1928 to 1961.

Fitted over all years, the growing season changes by -0.4 days per decade at this station.

Frost dates and growing season at Ripogenus Dam
Measure	Median, all years	Earliest period (1928 to 1961)	Recent period (1962 to 1994)	Recent against earliest	Fitted trend
Last spring frost	20 May	18 May	21 May	3 days later	-0.4 days per decade
First autumn frost	26 September	29 September	25 September	4 days earlier	-0.8 days per decade
Growing days	128 days	129 days	128 days	1 day fewer	-0.4 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

61 years, 1925 to 1994

A day with at least 50.9 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 104.5 mm (4.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Ripogenus 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	50.9 mm (2.0 in)
5 years	65.2 mm (2.6 in)
10 years	74.7 mm (2.9 in)
25 years	86.7 mm (3.4 in)
50 years	95.7 mm (3.8 in)
100 years	104.5 mm (4.1 in)	Longer than the 61 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, 61 years of values from 1925 to 1994.

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: 101.6 mm (4.0 in) in 1981; 95.3 mm (3.8 in) in 1970; 80.0 mm (3.1 in) in 1973.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Ripogenus Dam, at 1962. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1962 ran 0.3 C (0.6 F) lower than in the years before (likely change).

Suspected changes in the annual mean temperature at Ripogenus Dam, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1962	-0.3	-0.6	likely	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

Data for Ripogenus Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ripogenus 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).