Martin Dam Weather Records (USC00015140)

Record envelope, standing records and threshold days for Martin Dam (USC00015140), Alabama, United States, with 68 years of record.

Key Facts for Martin Dam

Martin Dam (USC00015140) is a weather station in Alabama, United States at 32.67 latitude and -85.92 longitude, 104 m (340 ft) above sea level.
The station reports from 1925 to 1992, 68 years of record.
1,464 records set at Martin Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Martin Dam set a daily record low minimum temperature of 14.4 C (57.9 F) on 31 August 1992.

About the Station

Location: Alabama, United States, 32.67 latitude, -85.92 longitude.
Elevation: 104 m (340 ft).
Period of record: 1925 to 1992, 68 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 Martin 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 Martin Dam, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	27.2 C (81.0 F)	-19.4 C (-2.9 F)	n/a	n/a
Feb	27.8 C (82.0 F)	-11.7 C (10.9 F)	n/a	n/a
Mar	31.1 C (88.0 F)	-12.2 C (10.0 F)	n/a	n/a
Apr	33.9 C (93.0 F)	-2.8 C (27.0 F)	n/a	n/a
May	36.7 C (98.1 F)	3.3 C (37.9 F)	n/a	n/a
Jun	38.3 C (100.9 F)	7.8 C (46.0 F)	n/a	n/a
Jul	39.4 C (102.9 F)	11.7 C (53.1 F)	n/a	n/a
Aug	38.9 C (102.0 F)	13.9 C (57.0 F)	n/a	n/a
Sep	38.9 C (102.0 F)	2.8 C (37.0 F)	n/a	n/a
Oct	36.1 C (97.0 F)	-2.2 C (28.0 F)	n/a	n/a
Nov	31.7 C (89.1 F)	-8.9 C (16.0 F)	n/a	n/a
Dec	26.7 C (80.1 F)	-16.7 C (1.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Martin Dam still stand. 1954 holds the most, with 59.

Standing records at Martin Dam by the year they were set
Year set	Standing records
1951	50
1952	36
1953	5
1954	59
1955	56
1956	42
1957	44
1958	38
1959	38
1960	29
1961	42
1962	43
1963	36
1964	21
1965	31
1966	30
1967	42
1968	31
1969	34
1970	40
1971	41
1972	30
1973	19
1974	31
1975	26
1976	38
1977	45
1978	34
1979	28
1980	40
1981	37
1982	33
1983	35
1984	44
1985	41
1986	27
1987	22
1988	23
1989	46
1990	17
1991	36
1992	24

All-Time Record Progression

3 new records

3 all-time records were set at Martin Dam between 10 December 1961 and 20 January 1985. Each dot is a new record.

When Martin Dam set new all-time records
Date	Kind	Detail
1961-12-10	Record daily precipitation	Record daily precipitation 150.1 mm (5.9 in)
1983-12-25	Record low maximum temperature	Record low maximum temperature -7.2 C (19.0 F)
1985-01-20	Record low minimum temperature	Record low minimum temperature -19.4 C (-2.9 F)

Wettest Day of Each Month

Dec: 150.1 mm (5.9 in)

The wettest day on record for each calendar month at Martin Dam. The most was 150.1 mm (5.9 in) on 10 December 1961.

Record daily precipitation for each month at Martin Dam
Month	Record daily precipitation (mm)	Date
Jan	119.1 mm (4.7 in)	23 January 1965
Feb	101.6 mm (4.0 in)	27 February 1929
Mar	128.3 mm (5.1 in)	20 March 1933
Apr	125.7 mm (4.9 in)	27 April 1944
May	100.1 mm (3.9 in)	14 May 1976
Jun	132.3 mm (5.2 in)	18 June 1989
Jul	109.7 mm (4.3 in)	10 July 1948
Aug	116.6 mm (4.6 in)	17 August 1939
Sep	103.4 mm (4.1 in)	1 September 1986
Oct	85.3 mm (3.4 in)	10 October 1934
Nov	117.9 mm (4.6 in)	27 November 1948
Dec	150.1 mm (5.9 in)	10 December 1961

Period of Record Coverage

1951 to 1992

42 years of record at Martin Dam, 1951 to 1992. 7 years have data for under 90 percent of days and are left out of rankings: 1951, 1952, 1953, 1954, 1967, 1982, 1992.

Days with data per year at Martin Dam
Year	Days with data	Share of year	Complete
1951	326	89%	No
1952	209	57%	No
1953	90	25%	No
1954	245	67%	No
1955	362	99%	Yes
1956	363	99%	Yes
1957	330	90%	Yes
1958	362	99%	Yes
1959	361	99%	Yes
1960	366	100%	Yes
1961	364	100%	Yes
1962	352	96%	Yes
1963	364	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	363	99%	Yes
1967	267	73%	No
1968	342	93%	Yes
1969	343	94%	Yes
1970	361	99%	Yes
1971	363	99%	Yes
1972	362	99%	Yes
1973	363	99%	Yes
1974	329	90%	Yes
1975	329	90%	Yes
1976	363	99%	Yes
1977	365	100%	Yes
1978	334	92%	Yes
1979	362	99%	Yes
1980	358	98%	Yes
1981	330	90%	Yes
1982	304	83%	No
1983	360	99%	Yes
1984	361	99%	Yes
1985	364	100%	Yes
1986	362	99%	Yes
1987	362	99%	Yes
1988	366	100%	Yes
1989	356	98%	Yes
1990	364	100%	Yes
1991	364	100%	Yes
1992	244	67%	No

Latest Records

Latest records at Martin Dam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 August 1992	Martin Dam, US	daily low min	14.4 C (57.9 F)	1.2 C (2.2 F)	6 years	12 of 100 (Routine)
30 August 1992	Martin Dam, US	monthly low min	13.9 C (57.0 F)	0.5 C (0.9 F)	36 years	27 of 100 (Routine)
28 August 1992	Martin Dam, US	daily rain	20.6 mm (0.8 in)	2.1 mm (0.08 in)	57 years	20 of 100 (Routine)
28 August 1992	Martin Dam, US	daily low max	25.6 C (78.1 F)	2.2 C (4.0 F)	6 years	14 of 100 (Routine)
26 August 1992	Martin Dam, US	daily high min (Tie)	21.7 C (71.1 F)	tie	37 years	3 of 100 (Routine)
23 August 1992	Martin Dam, US	daily low max	27.2 C (81.0 F)	0.6 C (1.1 F)	11 years	9 of 100 (Routine)
22 August 1992	Martin Dam, US	daily rain	23.6 mm (0.9 in)	10.6 mm (0.4 in)	43 years	20 of 100 (Routine)
20 August 1992	Martin Dam, US	daily low max	26.1 C (79.0 F)	0.6 C (1.1 F)	11 years	9 of 100 (Routine)
19 August 1992	Martin Dam, US	daily low min	16.7 C (62.1 F)	0.5 C (0.9 F)	16 years	11 of 100 (Routine)
18 August 1992	Martin Dam, US	daily low min	16.7 C (62.1 F)	0.5 C (0.9 F)	28 years	15 of 100 (Routine)
17 August 1992	Martin Dam, US	daily low max	27.8 C (82.0 F)	1.1 C (2.0 F)	16 years	12 of 100 (Routine)
16 August 1992	Martin Dam, US	daily low max	26.1 C (79.0 F)	2.2 C (4.0 F)	28 years	21 of 100 (Routine)
14 August 1992	Martin Dam, US	daily low max	25.0 C (77.0 F)	1.7 C (3.1 F)	28 years	19 of 100 (Routine)
2 August 1992	Martin Dam, US	daily low min (Tie)	16.7 C (62.1 F)	tie	26 years	2 of 100 (Routine)
30 July 1992	Martin Dam, US	daily rain	61.0 mm (2.4 in)	21.1 mm (0.8 in)	8 years	24 of 100 (Routine)
17 July 1992	Martin Dam, US	daily low max (Tie)	28.3 C (82.9 F)	tie	25 years	2 of 100 (Routine)
25 June 1992	Martin Dam, US	daily low min	13.3 C (55.9 F)	1.7 C (3.1 F)	8 years	12 of 100 (Routine)
23 June 1992	Martin Dam, US	daily low max (Tie)	27.2 C (81.0 F)	tie	9 years	1 of 100 (Routine)
14 June 1992	Martin Dam, US	daily low max	23.3 C (73.9 F)	3.4 C (6.1 F)	5 years	17 of 100 (Routine)
13 June 1992	Martin Dam, US	daily low max	21.1 C (70.0 F)	5.0 C (9.0 F)	7 years	23 of 100 (Routine)

Climate Trend

29 complete years, 1955 to 1991

One stripe for each of 29 complete years at Martin Dam, 1955 to 1991. Blue stripes are years cooler than the station's own mean of 17.3 C (63.1 F); red stripes are warmer. The coolest year was 1983, at 15.6 C (60.1 F), and the warmest was 1955, at 18.2 C (64.7 F). The strongest colour marks a difference of 1.7 C (3.1 F).

Annual mean temperature at Martin Dam as warming stripes, 1955 to 1991
Year	Annual mean temperature	Difference from the station mean
1955	18.2 C	+0.88 C
1956	18.1 C	+0.77 C
1958	17.1 C	-0.20 C
1959	18.1 C	+0.75 C
1960	17.2 C	-0.09 C
1961	17.3 C	+0.03 C
1962	17.8 C	+0.54 C
1963	17.1 C	-0.18 C
1964	17.3 C	+0.03 C
1966	17.0 C	-0.27 C
1968	17.2 C	-0.11 C
1969	17.7 C	+0.38 C
1970	17.7 C	+0.36 C
1971	17.7 C	+0.35 C
1972	18.1 C	+0.75 C
1973	17.9 C	+0.63 C
1976	16.0 C	-1.28 C
1977	17.2 C	-0.06 C
1979	16.8 C	-0.47 C
1980	17.3 C	-0.05 C
1983	15.6 C	-1.68 C
1984	16.9 C	-0.38 C
1985	17.0 C	-0.35 C
1986	17.6 C	+0.27 C
1987	17.0 C	-0.30 C
1988	16.5 C	-0.85 C
1989	16.7 C	-0.61 C
1990	18.1 C	+0.75 C
1991	17.6 C	+0.29 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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 1992

Yearly extremes at Martin Dam: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	39.4 C (102.9 F)	1960	36.7 C (98.1 F)	42
Coldest night (TNn)	-19.4 C (-2.9 F)	1985	-9.1 C (15.5 F)	42
Wettest day (Rx1day)	150.1 mm (5.9 in)	1961	82.4 mm (3.2 in)	68
Wettest five days (Rx5day)	313.7 mm (12.4 in)	1989	138.7 mm (5.5 in)	68
Longest dry spell (CDD)	40 days	1938	22 days	68

Hottest day (TXx)

The hottest day of the year at Martin Dam, 1925 to 1992. The record is 39.4 C (102.9 F) in 1960, marked on the chart; the median year is 36.7 C (98.1 F).

Hottest day (TXx) at Martin Dam by year
Year	Hottest day (TXx)
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	37.2 C (99.0 F)
1952	38.3 C (100.9 F)
1953	36.1 C (97.0 F)
1954	38.9 C (102.0 F)
1955	37.2 C (99.0 F)
1956	36.7 C (98.1 F)
1957	37.2 C (99.0 F)
1958	36.1 C (97.0 F)
1959	37.2 C (99.0 F)
1960	39.4 C (102.9 F)
1961	34.4 C (93.9 F)
1962	36.7 C (98.1 F)
1963	36.7 C (98.1 F)
1964	36.7 C (98.1 F)
1965	35.6 C (96.1 F)
1966	37.8 C (100.0 F)
1967	34.4 C (93.9 F)
1968	38.3 C (100.9 F)
1969	37.8 C (100.0 F)
1970	36.7 C (98.1 F)
1971	36.7 C (98.1 F)
1972	36.1 C (97.0 F)
1973	35.6 C (96.1 F)
1974	34.4 C (93.9 F)
1975	35.6 C (96.1 F)
1976	35.0 C (95.0 F)
1977	38.3 C (100.9 F)
1978	36.7 C (98.1 F)
1979	35.6 C (96.1 F)
1980	39.4 C (102.9 F)
1981	37.2 C (99.0 F)
1982	36.7 C (98.1 F)
1983	37.8 C (100.0 F)
1984	36.1 C (97.0 F)
1985	37.8 C (100.0 F)
1986	37.8 C (100.0 F)
1987	36.7 C (98.1 F)
1988	37.2 C (99.0 F)
1989	35.0 C (95.0 F)
1990	37.2 C (99.0 F)
1991	35.0 C (95.0 F)
1992	36.1 C (97.0 F)

Coldest night (TNn)

The coldest night of the year at Martin Dam, 1925 to 1992. The record is -19.4 C (-2.9 F) in 1985, marked on the chart; the median year is -9.1 C (15.5 F).

Coldest night (TNn) at Martin Dam by year
Year	Coldest night (TNn)
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	-6.7 C (19.9 F)
1952	-4.4 C (24.1 F)
1953	-7.8 C (18.0 F)
1954	-4.4 C (24.1 F)
1955	-8.9 C (16.0 F)
1956	-5.6 C (21.9 F)
1957	-9.4 C (15.1 F)
1958	-11.7 C (10.9 F)
1959	-8.9 C (16.0 F)
1960	-8.3 C (17.1 F)
1961	-10.6 C (12.9 F)
1962	-13.9 C (7.0 F)
1963	-16.7 C (1.9 F)
1964	-11.1 C (12.0 F)
1965	-8.9 C (16.0 F)
1966	-16.1 C (3.0 F)
1967	-7.8 C (18.0 F)
1968	-7.8 C (18.0 F)
1969	-9.4 C (15.1 F)
1970	-15.0 C (5.0 F)
1971	-10.0 C (14.0 F)
1972	-10.0 C (14.0 F)
1973	-6.7 C (19.9 F)
1974	-5.6 C (21.9 F)
1975	-6.1 C (21.0 F)
1976	-8.9 C (16.0 F)
1977	-15.6 C (3.9 F)
1978	-9.4 C (15.1 F)
1979	-10.6 C (12.9 F)
1980	-12.2 C (10.0 F)
1981	-11.1 C (12.0 F)
1982	-17.8 C (0.0 F)
1983	-16.7 C (1.9 F)
1984	-8.9 C (16.0 F)
1985	-19.4 C (-2.9 F)
1986	-10.6 C (12.9 F)
1987	-8.3 C (17.1 F)
1988	-6.7 C (19.9 F)
1989	-12.8 C (9.0 F)
1990	-4.4 C (24.1 F)
1991	-6.1 C (21.0 F)
1992	-6.7 C (19.9 F)

Wettest day (Rx1day)

The wettest day of the year at Martin Dam, 1925 to 1992. The record is 150.1 mm (5.9 in) in 1961, marked on the chart; the median year is 82.4 mm (3.2 in).

Wettest day (Rx1day) at Martin Dam by year
Year	Wettest day (Rx1day)
1925	96.5 mm (3.8 in)
1926	109.2 mm (4.3 in)
1927	32.3 mm (1.3 in)
1928	102.1 mm (4.0 in)
1929	101.6 mm (4.0 in)
1930	86.6 mm (3.4 in)
1931	35.1 mm (1.4 in)
1932	61.0 mm (2.4 in)
1933	128.3 mm (5.1 in)
1934	85.3 mm (3.4 in)
1935	79.5 mm (3.1 in)
1936	89.7 mm (3.5 in)
1937	59.7 mm (2.4 in)
1938	62.2 mm (2.4 in)
1939	116.6 mm (4.6 in)
1940	82.3 mm (3.2 in)
1941	108.0 mm (4.3 in)
1942	119.1 mm (4.7 in)
1943	74.4 mm (2.9 in)
1944	125.7 mm (4.9 in)
1945	76.7 mm (3.0 in)
1946	125.0 mm (4.9 in)
1947	71.1 mm (2.8 in)
1948	117.9 mm (4.6 in)
1949	51.1 mm (2.0 in)
1950	62.2 mm (2.4 in)
1951	48.3 mm (1.9 in)
1952	47.8 mm (1.9 in)
1953	92.7 mm (3.6 in)
1954	41.9 mm (1.6 in)
1955	69.9 mm (2.8 in)
1956	98.6 mm (3.9 in)
1957	127.0 mm (5.0 in)
1958	66.8 mm (2.6 in)
1959	74.7 mm (2.9 in)
1960	68.6 mm (2.7 in)
1961	150.1 mm (5.9 in)
1962	99.3 mm (3.9 in)
1963	52.1 mm (2.1 in)
1964	118.1 mm (4.6 in)
1965	119.1 mm (4.7 in)
1966	75.9 mm (3.0 in)
1967	65.3 mm (2.6 in)
1968	57.9 mm (2.3 in)
1969	100.6 mm (4.0 in)
1970	77.2 mm (3.0 in)
1971	117.1 mm (4.6 in)
1972	78.2 mm (3.1 in)
1973	92.5 mm (3.6 in)
1974	89.7 mm (3.5 in)
1975	92.7 mm (3.6 in)
1976	100.1 mm (3.9 in)
1977	82.0 mm (3.2 in)
1978	80.0 mm (3.1 in)
1979	87.4 mm (3.4 in)
1980	82.6 mm (3.3 in)
1981	101.6 mm (4.0 in)
1982	73.4 mm (2.9 in)
1983	74.4 mm (2.9 in)
1984	107.2 mm (4.2 in)
1985	72.4 mm (2.9 in)
1986	103.4 mm (4.1 in)
1987	55.9 mm (2.2 in)
1988	73.2 mm (2.9 in)
1989	132.3 mm (5.2 in)
1990	126.5 mm (5.0 in)
1991	66.8 mm (2.6 in)
1992	61.0 mm (2.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Martin Dam, 1925 to 1992. The record is 313.7 mm (12.4 in) in 1989, marked on the chart; the median year is 138.7 mm (5.5 in).

Wettest five days (Rx5day) at Martin Dam by year
Year	Wettest five days (Rx5day)
1925	212.3 mm (8.4 in)
1926	182.1 mm (7.2 in)
1927	74.2 mm (2.9 in)
1928	188.5 mm (7.4 in)
1929	186.4 mm (7.3 in)
1930	98.5 mm (3.9 in)
1931	46.0 mm (1.8 in)
1932	143.5 mm (5.6 in)
1933	128.3 mm (5.1 in)
1934	170.4 mm (6.7 in)
1935	143.3 mm (5.6 in)
1936	120.4 mm (4.7 in)
1937	137.2 mm (5.4 in)
1938	107.5 mm (4.2 in)
1939	234.2 mm (9.2 in)
1940	150.1 mm (5.9 in)
1941	176.9 mm (7.0 in)
1942	152.2 mm (6.0 in)
1943	156.6 mm (6.2 in)
1944	177.0 mm (7.0 in)
1945	170.4 mm (6.7 in)
1946	130.8 mm (5.1 in)
1947	144.6 mm (5.7 in)
1948	195.1 mm (7.7 in)
1949	159.2 mm (6.3 in)
1950	140.2 mm (5.5 in)
1951	73.4 mm (2.9 in)
1952	70.2 mm (2.8 in)
1953	125.2 mm (4.9 in)
1954	57.4 mm (2.3 in)
1955	102.6 mm (4.0 in)
1956	151.4 mm (6.0 in)
1957	160.0 mm (6.3 in)
1958	95.7 mm (3.8 in)
1959	105.7 mm (4.2 in)
1960	155.2 mm (6.1 in)
1961	287.8 mm (11.3 in)
1962	161.5 mm (6.4 in)
1963	131.7 mm (5.2 in)
1964	182.2 mm (7.2 in)
1965	135.0 mm (5.3 in)
1966	142.3 mm (5.6 in)
1967	115.1 mm (4.5 in)
1968	85.3 mm (3.4 in)
1969	105.9 mm (4.2 in)
1970	140.9 mm (5.5 in)
1971	187.9 mm (7.4 in)
1972	111.8 mm (4.4 in)
1973	100.6 mm (4.0 in)
1974	119.4 mm (4.7 in)
1975	152.3 mm (6.0 in)
1976	127.6 mm (5.0 in)
1977	93.4 mm (3.7 in)
1978	118.1 mm (4.6 in)
1979	133.9 mm (5.3 in)
1980	98.1 mm (3.9 in)
1981	156.7 mm (6.2 in)
1982	100.6 mm (4.0 in)
1983	135.9 mm (5.4 in)
1984	265.7 mm (10.5 in)
1985	164.8 mm (6.5 in)
1986	159.0 mm (6.3 in)
1987	100.1 mm (3.9 in)
1988	93.0 mm (3.7 in)
1989	313.7 mm (12.4 in)
1990	231.7 mm (9.1 in)
1991	106.4 mm (4.2 in)
1992	103.9 mm (4.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Martin Dam, 1925 to 1992. The record is 40 days in 1938, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Martin Dam by year
Year	Longest dry spell (CDD)
1925	24 days
1926	14 days
1927	24 days
1928	14 days
1929	18 days
1930	33 days
1931	23 days
1932	17 days
1933	22 days
1934	19 days
1935	38 days
1936	16 days
1937	19 days
1938	40 days
1939	28 days
1940	26 days
1941	32 days
1942	24 days
1943	22 days
1944	33 days
1945	13 days
1946	18 days
1947	20 days
1948	23 days
1949	30 days
1950	21 days
1951	25 days
1952	32 days
1953	26 days
1954	19 days
1955	29 days
1956	19 days
1957	23 days
1958	27 days
1959	20 days
1960	17 days
1961	30 days
1962	19 days
1963	32 days
1964	34 days
1965	27 days
1966	18 days
1967	19 days
1968	27 days
1969	21 days
1970	21 days
1971	21 days
1972	27 days
1973	26 days
1974	24 days
1975	19 days
1976	20 days
1977	19 days
1978	23 days
1979	13 days
1980	23 days
1981	19 days
1982	20 days
1983	22 days
1984	26 days
1985	20 days
1986	30 days
1987	26 days
1988	18 days
1989	19 days
1990	19 days
1991	18 days
1992	14 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

29 years with a frost

Across 29 years with a frost, the median last spring frost at Martin Dam falls on 26 March and the median first autumn frost on 15 November, which leaves a median of 236 days between them.

Fitted over all years, the growing season changes by +2.5 days per decade at this station.

Frost dates and growing season at Martin Dam
Measure	Median, all years	Earliest period	Recent period (1955 to 1991)	Recent against earliest	Fitted trend
Last spring frost	26 March	n/a	26 March	n/a	-2.7 days per decade
First autumn frost	15 November	n/a	15 November	n/a	-0.2 days per decade
Growing days	236 days	n/a	236 days	n/a	+2.5 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

64 years, 1925 to 1991

A day with at least 86.0 mm (3.4 in) of rain is expected about once in 2 years. A day with at least 151.7 mm (6.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Martin 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	86.0 mm (3.4 in)
5 years	109.2 mm (4.3 in)
10 years	121.9 mm (4.8 in)
25 years	135.6 mm (5.3 in)
50 years	144.2 mm (5.7 in)
100 years	151.7 mm (6.0 in)	Longer than the 64 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, 64 years of values from 1925 to 1991.

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: 150.1 mm (5.9 in) in 1961; 132.3 mm (5.2 in) in 1989; 128.3 mm (5.1 in) in 1933.

Download the Data

Data for Martin Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Martin 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 2026-10-17 (17 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).