Hulah Dam Weather Records (USC00344393)

Record envelope, standing records and threshold days for Hulah Dam (USC00344393), Oklahoma, United States, with 52 years of record.

Key Facts for Hulah Dam

Hulah Dam (USC00344393) is a weather station in Oklahoma, United States at 36.92 latitude and -96.10 longitude, 227 m (744 ft) above sea level.
The station reports from 1946 to 1997, 52 years of record.
1,464 records set at Hulah Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Hulah Dam set a daily record low maximum temperature of 2.8 C (37.0 F) on 13 April 1997.

About the Station

Location: Oklahoma, United States, 36.92 latitude, -96.10 longitude.
Elevation: 227 m (744 ft).
Period of record: 1946 to 1997, 52 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 Hulah 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 Hulah Dam, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	26.7 C (80.1 F)	-29.4 C (-20.9 F)	n/a	n/a
Feb	32.2 C (90.0 F)	-26.1 C (-15.0 F)	n/a	n/a
Mar	33.3 C (91.9 F)	-19.4 C (-2.9 F)	n/a	n/a
Apr	38.3 C (100.9 F)	-11.7 C (10.9 F)	n/a	n/a
May	35.0 C (95.0 F)	-1.1 C (30.0 F)	n/a	n/a
Jun	39.4 C (102.9 F)	6.7 C (44.1 F)	n/a	n/a
Jul	45.0 C (113.0 F)	8.3 C (46.9 F)	n/a	n/a
Aug	46.1 C (115.0 F)	6.7 C (44.1 F)	n/a	n/a
Sep	43.3 C (109.9 F)	0.0 C (32.0 F)	n/a	n/a
Oct	37.2 C (99.0 F)	-7.8 C (18.0 F)	n/a	n/a
Nov	30.0 C (86.0 F)	-15.6 C (3.9 F)	n/a	n/a
Dec	26.7 C (80.1 F)	-26.7 C (-16.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Hulah Dam still stand. 1956 holds the most, with 81.

Standing records at Hulah Dam by the year they were set
Year set	Standing records
1946	21
1947	48
1948	22
1949	35
1950	38
1951	32
1952	50
1953	56
1954	64
1955	35
1956	81
1957	27
1958	24
1959	34
1960	28
1961	24
1962	27
1963	42
1964	29
1965	32
1966	34
1967	31
1968	34
1969	18
1970	33
1971	29
1972	32
1973	15
1974	27
1975	21
1976	25
1977	21
1978	34
1979	26
1980	32
1981	18
1982	16
1983	21
1984	17
1985	19
1986	16
1987	14
1988	22
1989	33
1990	18
1991	18
1992	22
1993	16
1994	11
1995	12
1996	21
1997	9

All-Time Record Progression

3 new records

3 all-time records were set at Hulah Dam between 21 November 1979 and 20 December 1983. Each dot is a new record.

When Hulah Dam set new all-time records
Date	Kind	Detail
1979-11-21	Record daily precipitation	Record daily precipitation 148.6 mm (5.9 in)
1980-02-08	Record daily snowfall	Record daily snowfall 30.5 cm (12.0 in)
1983-12-20	Record low maximum temperature	Record low maximum temperature -15.0 C (5.0 F)

Wettest Day of Each Month

Nov: 148.6 mm (5.9 in)

The wettest day on record for each calendar month at Hulah Dam. The most was 148.6 mm (5.9 in) on 21 November 1979.

Record daily precipitation for each month at Hulah Dam
Month	Record daily precipitation (mm)	Date
Jan	47.0 mm (1.9 in)	3 January 1971
Feb	82.0 mm (3.2 in)	21 February 1997
Mar	126.5 mm (5.0 in)	11 March 1974
Apr	84.3 mm (3.3 in)	1 April 1988
May	107.4 mm (4.2 in)	9 May 1993
Jun	138.7 mm (5.5 in)	11 June 1967
Jul	121.4 mm (4.8 in)	15 July 1959
Aug	89.7 mm (3.5 in)	20 August 1989
Sep	120.9 mm (4.8 in)	30 September 1986
Oct	137.2 mm (5.4 in)	13 October 1984
Nov	148.6 mm (5.9 in)	21 November 1979
Dec	59.7 mm (2.4 in)	20 December 1991

Period of Record Coverage

1946 to 1997

52 years of record at Hulah Dam, 1946 to 1997. 20 years have data for under 90 percent of days and are left out of rankings: 1946, 1979, 1980, 1981, 1982, 1983, 1984, 1985 and others.

Days with data per year at Hulah Dam
Year	Days with data	Share of year	Complete
1946	200	55%	No
1947	345	95%	Yes
1948	348	95%	Yes
1949	344	94%	Yes
1950	330	90%	Yes
1951	357	98%	Yes
1952	361	99%	Yes
1953	361	99%	Yes
1954	363	99%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	364	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	364	99%	Yes
1965	362	99%	Yes
1966	364	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	364	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	365	100%	Yes
1973	334	92%	Yes
1974	363	99%	Yes
1975	349	96%	Yes
1976	334	91%	Yes
1977	344	94%	Yes
1978	350	96%	Yes
1979	260	71%	No
1980	286	78%	No
1981	270	74%	No
1982	271	74%	No
1983	239	65%	No
1984	242	66%	No
1985	210	58%	No
1986	205	56%	No
1987	228	62%	No
1988	252	69%	No
1989	273	75%	No
1990	262	72%	No
1991	246	67%	No
1992	246	67%	No
1993	215	59%	No
1994	261	72%	No
1995	254	70%	No
1996	243	66%	No
1997	82	22%	No

Latest Records

Latest records at Hulah Dam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
13 April 1997	Hulah Dam, US	daily low max	2.8 C (37.0 F)	2.8 C (5.0 F)	40 years	21 of 100 (Routine)
12 April 1997	Hulah Dam, US	daily low max	7.2 C (45.0 F)	1.7 C (3.1 F)	40 years	19 of 100 (Routine)
10 April 1997	Hulah Dam, US	daily low min (Tie)	-2.8 C (27.0 F)	tie	24 years	3 of 100 (Routine)
9 April 1997	Hulah Dam, US	daily low min (Tie)	-3.3 C (26.1 F)	tie	32 years	3 of 100 (Routine)
24 March 1997	Hulah Dam, US	daily high max	32.2 C (90.0 F)	2.8 C (5.0 F)	3 years	8 of 100 (Routine)
14 March 1997	Hulah Dam, US	daily low min	-12.8 C (9.0 F)	3.4 C (6.1 F)	22 years	16 of 100 (Routine)
21 February 1997	Hulah Dam, US	monthly rain	82.0 mm (3.2 in)	21.0 mm (0.8 in)	11 years	42 of 100 (Notable)
20 February 1997	Hulah Dam, US	daily high min (Tie)	4.4 C (39.9 F)	tie	46 years	4 of 100 (Routine)
7 February 1997	Hulah Dam, US	daily rain	5.1 mm (0.20 in)	1.3 mm (0.05 in)	19 years	11 of 100 (Routine)
29 January 1997	Hulah Dam, US	daily low min	-22.2 C (-8.0 F)	2.8 C (5.0 F)	18 years	14 of 100 (Routine)
17 January 1997	Hulah Dam, US	daily low min	-20.0 C (-4.0 F)	0.6 C (1.1 F)	19 years	10 of 100 (Routine)
6 January 1997	Hulah Dam, US	daily high max	23.9 C (75.0 F)	3.3 C (5.9 F)	8 years	11 of 100 (Routine)
3 January 1997	Hulah Dam, US	daily high max	25.6 C (78.1 F)	2.8 C (5.0 F)	33 years	17 of 100 (Routine)
2 January 1997	Hulah Dam, US	daily high min	6.1 C (43.0 F)	2.2 C (4.0 F)	5 years	9 of 100 (Routine)
11 December 1996	Hulah Dam, US	daily high max	24.4 C (75.9 F)	3.3 C (5.9 F)	26 years	16 of 100 (Routine)
23 October 1996	Hulah Dam, US	daily low max	10.6 C (51.1 F)	2.7 C (4.9 F)	45 years	22 of 100 (Routine)
22 October 1996	Hulah Dam, US	daily low max	11.1 C (52.0 F)	1.1 C (2.0 F)	12 years	9 of 100 (Routine)
27 September 1996	Hulah Dam, US	daily low max	13.9 C (57.0 F)	1.7 C (3.1 F)	12 years	11 of 100 (Routine)
26 September 1996	Hulah Dam, US	daily rain	58.2 mm (2.3 in)	39.9 mm (1.6 in)	4 years	25 of 100 (Routine)
11 August 1996	Hulah Dam, US	daily low max	23.3 C (73.9 F)	2.3 C (4.1 F)	29 years	18 of 100 (Routine)

Climate Trend

31 complete years, 1947 to 1978

One stripe for each of 31 complete years at Hulah Dam, 1947 to 1978. Blue stripes are years cooler than the station's own mean of 14.4 C (57.9 F); red stripes are warmer. The coolest year was 1961, at 13.5 C (56.3 F), and the warmest was 1954, at 17.0 C (62.6 F). The strongest colour marks a difference of 2.6 C (4.7 F).

Annual mean temperature at Hulah Dam as warming stripes, 1947 to 1978
Year	Annual mean temperature	Difference from the station mean
1947	14.4 C	+0.02 C
1948	13.9 C	-0.50 C
1949	13.7 C	-0.69 C
1950	14.0 C	-0.41 C
1951	14.5 C	+0.10 C
1952	15.5 C	+1.13 C
1953	16.1 C	+1.66 C
1954	17.0 C	+2.58 C
1955	15.7 C	+1.25 C
1956	16.5 C	+2.11 C
1957	15.1 C	+0.69 C
1958	13.8 C	-0.59 C
1959	14.1 C	-0.33 C
1960	13.9 C	-0.54 C
1961	13.5 C	-0.93 C
1962	14.3 C	-0.15 C
1963	14.9 C	+0.51 C
1964	14.5 C	+0.11 C
1965	14.7 C	+0.25 C
1966	13.8 C	-0.64 C
1967	13.8 C	-0.63 C
1968	13.5 C	-0.90 C
1969	13.8 C	-0.57 C
1970	13.9 C	-0.49 C
1971	14.1 C	-0.28 C
1972	13.7 C	-0.71 C
1974	14.0 C	-0.40 C
1975	14.1 C	-0.33 C
1976	13.7 C	-0.72 C
1977	14.9 C	+0.45 C
1978	13.5 C	-0.93 C

The annual mean temperature here has fallen by 0.39 C (0.05 to 0.73) per decade over 1947 to 1978. In Fahrenheit: 0.7 F (0.1 to 1.3) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Hulah Dam
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.39 C (-0.73 to -0.05) per decade	-0.7 F (-1.3 to -0.1) per decade	1947 to 1978	31	Fall
Mean daily maximum	-0.5 C (-1.0 to -0.1) per decade	-1.0 F (-1.8 to -0.2) per decade	1947 to 1978	31	Fall
Mean daily minimum	-0.2 C (-0.5 to 0.1) per decade	-0.4 F (-0.9 to 0.1) per decade	1947 to 1978	31	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

1946 to 1997

Yearly extremes at Hulah Dam: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	46.1 C (115.0 F)	1956	39.4 C (102.9 F)	52
Coldest night (TNn)	-29.4 C (-20.9 F)	1949	-18.9 C (-2.0 F)	52
Wettest day (Rx1day)	148.6 mm (5.9 in)	1979	68.9 mm (2.7 in)	52
Wettest five days (Rx5day)	259.4 mm (10.2 in)	1974	108.6 mm (4.3 in)	52
Longest dry spell (CDD)	80 days	1965	31 days	52

Hottest day (TXx)

The hottest day of the year at Hulah Dam, 1946 to 1997. The record is 46.1 C (115.0 F) in 1956, marked on the chart; the median year is 39.4 C (102.9 F).

Hottest day (TXx) at Hulah Dam by year
Year	Hottest day (TXx)
1946	42.2 C (108.0 F)
1947	43.3 C (109.9 F)
1948	36.7 C (98.1 F)
1949	37.8 C (100.0 F)
1950	35.6 C (96.1 F)
1951	41.7 C (107.1 F)
1952	42.2 C (108.0 F)
1953	39.4 C (102.9 F)
1954	45.0 C (113.0 F)
1955	39.4 C (102.9 F)
1956	46.1 C (115.0 F)
1957	40.6 C (105.1 F)
1958	38.3 C (100.9 F)
1959	36.7 C (98.1 F)
1960	37.8 C (100.0 F)
1961	36.7 C (98.1 F)
1962	40.0 C (104.0 F)
1963	41.1 C (106.0 F)
1964	42.8 C (109.0 F)
1965	38.9 C (102.0 F)
1966	40.0 C (104.0 F)
1967	37.2 C (99.0 F)
1968	39.4 C (102.9 F)
1969	38.9 C (102.0 F)
1970	41.7 C (107.1 F)
1971	38.9 C (102.0 F)
1972	38.9 C (102.0 F)
1973	36.7 C (98.1 F)
1974	41.1 C (106.0 F)
1975	37.8 C (100.0 F)
1976	39.4 C (102.9 F)
1977	40.6 C (105.1 F)
1978	40.6 C (105.1 F)
1979	35.6 C (96.1 F)
1980	42.8 C (109.0 F)
1981	40.0 C (104.0 F)
1982	40.0 C (104.0 F)
1983	40.0 C (104.0 F)
1984	41.1 C (106.0 F)
1985	38.9 C (102.0 F)
1986	34.4 C (93.9 F)
1987	38.9 C (102.0 F)
1988	40.6 C (105.1 F)
1989	39.4 C (102.9 F)
1990	40.0 C (104.0 F)
1991	41.7 C (107.1 F)
1992	36.1 C (97.0 F)
1993	38.9 C (102.0 F)
1994	37.2 C (99.0 F)
1995	37.8 C (100.0 F)
1996	42.2 C (108.0 F)
1997	32.2 C (90.0 F)

Coldest night (TNn)

The coldest night of the year at Hulah Dam, 1946 to 1997. The record is -29.4 C (-20.9 F) in 1949, marked on the chart; the median year is -18.9 C (-2.0 F).

Coldest night (TNn) at Hulah Dam by year
Year	Coldest night (TNn)
1946	-16.1 C (3.0 F)
1947	-28.9 C (-20.0 F)
1948	-19.4 C (-2.9 F)
1949	-29.4 C (-20.9 F)
1950	-18.3 C (-0.9 F)
1951	-25.0 C (-13.0 F)
1952	-12.8 C (9.0 F)
1953	-16.1 C (3.0 F)
1954	-18.3 C (-0.9 F)
1955	-15.0 C (5.0 F)
1956	-13.3 C (8.1 F)
1957	-12.8 C (9.0 F)
1958	-16.1 C (3.0 F)
1959	-25.0 C (-13.0 F)
1960	-16.1 C (3.0 F)
1961	-16.7 C (1.9 F)
1962	-20.6 C (-5.1 F)
1963	-23.3 C (-9.9 F)
1964	-16.7 C (1.9 F)
1965	-15.0 C (5.0 F)
1966	-24.4 C (-11.9 F)
1967	-17.8 C (0.0 F)
1968	-18.9 C (-2.0 F)
1969	-18.9 C (-2.0 F)
1970	-17.2 C (1.0 F)
1971	-20.6 C (-5.1 F)
1972	-18.3 C (-0.9 F)
1973	-20.0 C (-4.0 F)
1974	-16.7 C (1.9 F)
1975	-15.0 C (5.0 F)
1976	-19.4 C (-2.9 F)
1977	-22.8 C (-9.0 F)
1978	-20.0 C (-4.0 F)
1979	-25.0 C (-13.0 F)
1980	-19.4 C (-2.9 F)
1981	-22.2 C (-8.0 F)
1982	-22.2 C (-8.0 F)
1983	-26.7 C (-16.1 F)
1984	-27.8 C (-18.0 F)
1985	-22.8 C (-9.0 F)
1986	-15.0 C (5.0 F)
1987	-17.8 C (0.0 F)
1988	-23.3 C (-9.9 F)
1989	-25.6 C (-14.1 F)
1990	-18.3 C (-0.9 F)
1991	-12.2 C (10.0 F)
1992	-12.2 C (10.0 F)
1993	-18.9 C (-2.0 F)
1994	-14.4 C (6.1 F)
1995	-16.1 C (3.0 F)
1996	-26.1 C (-15.0 F)
1997	-22.2 C (-8.0 F)

Wettest day (Rx1day)

The wettest day of the year at Hulah Dam, 1946 to 1997. The record is 148.6 mm (5.9 in) in 1979, marked on the chart; the median year is 68.9 mm (2.7 in).

Wettest day (Rx1day) at Hulah Dam by year
Year	Wettest day (Rx1day)
1946	38.6 mm (1.5 in)
1947	63.2 mm (2.5 in)
1948	88.9 mm (3.5 in)
1949	42.2 mm (1.7 in)
1950	45.0 mm (1.8 in)
1951	102.9 mm (4.1 in)
1952	54.4 mm (2.1 in)
1953	116.3 mm (4.6 in)
1954	67.8 mm (2.7 in)
1955	101.9 mm (4.0 in)
1956	57.2 mm (2.3 in)
1957	81.3 mm (3.2 in)
1958	48.3 mm (1.9 in)
1959	121.4 mm (4.8 in)
1960	60.5 mm (2.4 in)
1961	114.3 mm (4.5 in)
1962	78.7 mm (3.1 in)
1963	35.1 mm (1.4 in)
1964	79.8 mm (3.1 in)
1965	61.5 mm (2.4 in)
1966	52.1 mm (2.1 in)
1967	138.7 mm (5.5 in)
1968	69.9 mm (2.8 in)
1969	87.6 mm (3.4 in)
1970	69.3 mm (2.7 in)
1971	66.5 mm (2.6 in)
1972	66.0 mm (2.6 in)
1973	68.6 mm (2.7 in)
1974	126.5 mm (5.0 in)
1975	66.0 mm (2.6 in)
1976	67.6 mm (2.7 in)
1977	88.9 mm (3.5 in)
1978	108.0 mm (4.3 in)
1979	148.6 mm (5.9 in)
1980	38.1 mm (1.5 in)
1981	46.7 mm (1.8 in)
1982	66.0 mm (2.6 in)
1983	108.5 mm (4.3 in)
1984	137.2 mm (5.4 in)
1985	61.0 mm (2.4 in)
1986	120.9 mm (4.8 in)
1987	72.4 mm (2.9 in)
1988	89.4 mm (3.5 in)
1989	89.7 mm (3.5 in)
1990	71.1 mm (2.8 in)
1991	59.7 mm (2.4 in)
1992	65.3 mm (2.6 in)
1993	107.4 mm (4.2 in)
1994	66.3 mm (2.6 in)
1995	62.2 mm (2.4 in)
1996	58.2 mm (2.3 in)
1997	82.0 mm (3.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Hulah Dam, 1946 to 1997. The record is 259.4 mm (10.2 in) in 1974, marked on the chart; the median year is 108.6 mm (4.3 in).

Wettest five days (Rx5day) at Hulah Dam by year
Year	Wettest five days (Rx5day)
1946	95.5 mm (3.8 in)
1947	79.3 mm (3.1 in)
1948	131.1 mm (5.2 in)
1949	76.7 mm (3.0 in)
1950	127.9 mm (5.0 in)
1951	105.4 mm (4.1 in)
1952	54.4 mm (2.1 in)
1953	116.3 mm (4.6 in)
1954	133.6 mm (5.3 in)
1955	162.1 mm (6.4 in)
1956	58.0 mm (2.3 in)
1957	115.3 mm (4.5 in)
1958	86.1 mm (3.4 in)
1959	181.9 mm (7.2 in)
1960	73.1 mm (2.9 in)
1961	116.6 mm (4.6 in)
1962	86.6 mm (3.4 in)
1963	49.5 mm (1.9 in)
1964	152.4 mm (6.0 in)
1965	119.3 mm (4.7 in)
1966	115.6 mm (4.6 in)
1967	142.5 mm (5.6 in)
1968	90.5 mm (3.6 in)
1969	102.3 mm (4.0 in)
1970	82.3 mm (3.2 in)
1971	101.0 mm (4.0 in)
1972	99.3 mm (3.9 in)
1973	111.8 mm (4.4 in)
1974	259.4 mm (10.2 in)
1975	117.6 mm (4.6 in)
1976	121.9 mm (4.8 in)
1977	101.3 mm (4.0 in)
1978	144.5 mm (5.7 in)
1979	180.9 mm (7.1 in)
1980	90.7 mm (3.6 in)
1981	64.2 mm (2.5 in)
1982	93.8 mm (3.7 in)
1983	150.4 mm (5.9 in)
1984	169.8 mm (6.7 in)
1985	120.4 mm (4.7 in)
1986	144.0 mm (5.7 in)
1987	51.3 mm (2.0 in)
1988	212.1 mm (8.4 in)
1989	99.1 mm (3.9 in)
1990	115.6 mm (4.6 in)
1991	95.0 mm (3.7 in)
1992	69.3 mm (2.7 in)
1993	143.9 mm (5.7 in)
1994	69.9 mm (2.8 in)
1995	120.9 mm (4.8 in)
1996	83.3 mm (3.3 in)
1997	92.1 mm (3.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Hulah Dam, 1946 to 1997. The record is 80 days in 1965, marked on the chart; the median year is 31 days.

Longest dry spell (CDD) at Hulah Dam by year
Year	Longest dry spell (CDD)
1946	25 days
1947	35 days
1948	27 days
1949	40 days
1950	57 days
1951	17 days
1952	74 days
1953	22 days
1954	36 days
1955	56 days
1956	33 days
1957	28 days
1958	28 days
1959	36 days
1960	20 days
1961	21 days
1962	22 days
1963	57 days
1964	29 days
1965	80 days
1966	42 days
1967	29 days
1968	18 days
1969	22 days
1970	30 days
1971	40 days
1972	37 days
1973	23 days
1974	33 days
1975	25 days
1976	36 days
1977	25 days
1978	34 days
1979	38 days
1980	35 days
1981	31 days
1982	23 days
1983	54 days
1984	21 days
1985	22 days
1986	32 days
1987	16 days
1988	27 days
1989	62 days
1990	25 days
1991	31 days
1992	16 days
1993	21 days
1994	47 days
1995	65 days
1996	57 days
1997	21 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

31 years with a frost

Across 31 years with a frost, the median last spring frost at Hulah Dam falls on 14 April and the median first autumn frost on 20 October, which leaves a median of 195 days between them.

Fitted over all years, the growing season changes by -1.3 days per decade at this station.

Frost dates and growing season at Hulah Dam
Measure	Median, all years	Earliest period	Recent period (1948 to 1978)	Recent against earliest	Fitted trend
Last spring frost	14 April	n/a	14 April	n/a	-1.9 days per decade
First autumn frost	20 October	n/a	20 October	n/a	-3.2 days per decade
Growing days	195 days	n/a	195 days	n/a	-1.3 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

40 years, 1948 to 1996

A day with at least 71.9 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 168.2 mm (6.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Hulah 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	71.9 mm (2.8 in)
5 years	96.3 mm (3.8 in)
10 years	112.9 mm (4.4 in)
25 years	134.7 mm (5.3 in)
50 years	151.3 mm (6.0 in)	Longer than the 40 years of record
100 years	168.2 mm (6.6 in)	Longer than the 40 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, 40 years of values from 1948 to 1996.

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: 138.7 mm (5.5 in) in 1967; 137.2 mm (5.4 in) in 1984; 126.5 mm (5.0 in) in 1974.

Download the Data

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