Heart Mtn Weather Records (USC00484411)

Record envelope, standing records and threshold days for Heart Mtn (USC00484411), Wyoming, United States, with 67 years of record.

Key Facts for Heart Mtn

Heart Mtn (USC00484411) is a weather station in Wyoming, United States at 44.71 latitude and -108.96 longitude, 1,460 m (4,790 ft) above sea level.
The station reports from 1942 to 2008, 67 years of record.
1,464 records set at Heart Mtn still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Heart Mtn set a daily record low minimum temperature of 3.3 C (37.9 F) on 21 June 2008.

About the Station

Location: Wyoming, United States, 44.71 latitude, -108.96 longitude.
Elevation: 1,460 m (4,790 ft).
Period of record: 1942 to 2008, 67 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 Heart Mtn. 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 Heart Mtn, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	20.0 C (68.0 F)	-36.7 C (-34.1 F)	n/a	n/a
Feb	21.7 C (71.1 F)	-38.9 C (-38.0 F)	n/a	n/a
Mar	26.7 C (80.1 F)	-30.6 C (-23.1 F)	n/a	n/a
Apr	30.6 C (87.1 F)	-17.2 C (1.0 F)	n/a	n/a
May	33.9 C (93.0 F)	-10.0 C (14.0 F)	n/a	n/a
Jun	38.3 C (100.9 F)	-2.2 C (28.0 F)	n/a	n/a
Jul	38.3 C (100.9 F)	1.1 C (34.0 F)	n/a	n/a
Aug	37.8 C (100.0 F)	0.0 C (32.0 F)	n/a	n/a
Sep	36.1 C (97.0 F)	-11.1 C (12.0 F)	n/a	n/a
Oct	29.4 C (84.9 F)	-23.3 C (-9.9 F)	n/a	n/a
Nov	23.3 C (73.9 F)	-31.7 C (-25.1 F)	n/a	n/a
Dec	21.1 C (70.0 F)	-37.8 C (-36.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Heart Mtn still stand. 1954 holds the most, with 46.

Standing records at Heart Mtn by the year they were set
Year set	Standing records
1942	3
1943	35
1944	18
1945	12
1949	17
1950	40
1951	33
1952	23
1953	41
1954	46
1955	37
1956	23
1957	19
1958	18
1959	25
1960	10
1961	15
1962	30
1963	19
1964	14
1965	34
1966	31
1967	17
1968	19
1969	22
1970	17
1971	20
1972	39
1973	11
1974	17
1975	38
1976	20
1977	17
1978	31
1979	20
1980	26
1981	17
1982	19
1983	34
1984	26
1985	46
1986	29
1987	29
1988	27
1989	33
1990	26
1991	24
1992	26
1993	23
1994	13
1995	21
1996	25
1997	21
1998	15
1999	16
2000	13
2001	9
2002	12
2003	31
2004	16
2005	15
2006	17
2007	18
2008	6

All-Time Record Progression

11 new records

11 all-time records were set at Heart Mtn between 24 December 1983 and 30 July 2006. Each dot is a new record.

When Heart Mtn set new all-time records
Date	Kind	Detail
1983-12-24	Record low maximum temperature	Record low maximum temperature -26.1 C (-15.0 F)
1983-12-24	Record low minimum temperature	Record low minimum temperature -37.2 C (-35.0 F)
1988-05-07	Record daily precipitation	Record daily precipitation 63.0 mm (2.5 in)
1989-02-02	Record low maximum temperature	Record low maximum temperature -34.4 C (-29.9 F)
1989-02-02	Record low minimum temperature	Record low minimum temperature -37.8 C (-36.0 F)
1989-02-03	Record low minimum temperature	Record low minimum temperature -38.9 C (-38.0 F)
1992-10-14	Record daily snowfall	Record daily snowfall 30.5 cm (12.0 in)
1996-12-25	Record daily snowfall	Record daily snowfall 45.7 cm (18.0 in)
1996-12-25	Record snow depth	Record snow depth 50.8 cm (20.0 in)
2001-06-13	Record daily precipitation	Record daily precipitation 80.5 mm (3.2 in)
2006-07-30	Record high minimum temperature	Record high minimum temperature 21.7 C (71.1 F)

Wettest Day of Each Month

Jun: 80.5 mm (3.2 in)

The wettest day on record for each calendar month at Heart Mtn. The most was 80.5 mm (3.2 in) on 13 June 2001.

Record daily precipitation for each month at Heart Mtn
Month	Record daily precipitation (mm)	Date
Jan	14.5 mm (0.6 in)	11 January 1998
Feb	15.2 mm (0.6 in)	29 February 2004
Mar	20.3 mm (0.8 in)	29 March 1977
Apr	38.1 mm (1.5 in)	19 April 2007
May	63.0 mm (2.5 in)	7 May 1988
Jun	80.5 mm (3.2 in)	13 June 2001
Jul	42.4 mm (1.7 in)	10 July 1951
Aug	34.8 mm (1.4 in)	20 August 1965
Sep	33.8 mm (1.3 in)	19 September 1961
Oct	23.4 mm (0.9 in)	31 October 1974
Nov	19.1 mm (0.8 in)	2 November 1990
Dec	8.1 mm (0.32 in)	12 December 1968

Period of Record Coverage

1942 to 2008

64 years of record at Heart Mtn, 1942 to 2008. 6 years have data for under 90 percent of days and are left out of rankings: 1942, 1944, 1945, 1949, 1960, 2008.

Days with data per year at Heart Mtn
Year	Days with data	Share of year	Complete
1942	35	10%	No
1943	342	94%	Yes
1944	301	82%	No
1945	212	58%	No
1949	150	41%	No
1950	351	96%	Yes
1951	359	98%	Yes
1952	358	98%	Yes
1953	357	98%	Yes
1954	363	99%	Yes
1955	365	100%	Yes
1956	363	99%	Yes
1957	362	99%	Yes
1958	364	100%	Yes
1959	364	100%	Yes
1960	239	65%	No
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	364	100%	Yes
1967	363	99%	Yes
1968	335	92%	Yes
1969	362	99%	Yes
1970	363	99%	Yes
1971	365	100%	Yes
1972	365	100%	Yes
1973	364	100%	Yes
1974	364	100%	Yes
1975	365	100%	Yes
1976	363	99%	Yes
1977	364	100%	Yes
1978	363	99%	Yes
1979	364	100%	Yes
1980	363	99%	Yes
1981	364	100%	Yes
1982	361	99%	Yes
1983	362	99%	Yes
1984	361	99%	Yes
1985	351	96%	Yes
1986	354	97%	Yes
1987	361	99%	Yes
1988	360	98%	Yes
1989	361	99%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	365	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	363	99%	Yes
1996	360	98%	Yes
1997	362	99%	Yes
1998	364	100%	Yes
1999	364	100%	Yes
2000	361	99%	Yes
2001	363	99%	Yes
2002	362	99%	Yes
2003	358	98%	Yes
2004	346	95%	Yes
2005	362	99%	Yes
2006	361	99%	Yes
2007	365	100%	Yes
2008	180	49%	No

Latest Records

Latest records at Heart Mtn
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 June 2008	Heart Mtn, US	daily low min	3.3 C (37.9 F)	0.6 C (1.1 F)	44 years	20 of 100 (Routine)
19 June 2008	Heart Mtn, US	daily low min	0.0 C (32.0 F)	2.8 C (5.0 F)	12 years	17 of 100 (Routine)
27 May 2008	Heart Mtn, US	daily low max (Tie)	10.0 C (50.0 F)	tie	46 years	4 of 100 (Routine)
23 May 2008	Heart Mtn, US	daily rain	20.1 mm (0.8 in)	3.6 mm (0.14 in)	12 years	14 of 100 (Routine)
22 May 2008	Heart Mtn, US	daily rain	46.2 mm (1.8 in)	23.8 mm (0.9 in)	37 years	52 of 100 (Notable)
22 May 2008	Heart Mtn, US	daily low max	5.6 C (42.1 F)	1.6 C (2.9 F)	37 years	19 of 100 (Routine)
18 May 2008	Heart Mtn, US	daily high min	12.2 C (54.0 F)	0.5 C (0.9 F)	16 years	11 of 100 (Routine)
10 May 2008	Heart Mtn, US	daily low min	-6.7 C (19.9 F)	3.4 C (6.1 F)	25 years	21 of 100 (Routine)
2 May 2008	Heart Mtn, US	monthly snowfall	10.2 cm (4.0 in)	2.6 cm (1.0 in)	35 years	31 of 100 (Routine)
2 May 2008	Heart Mtn, US	daily rain (Tie)	6.4 mm (0.25 in)	tie	44 years	4 of 100 (Routine)
21 April 2008	Heart Mtn, US	daily low min	-15.0 C (5.0 F)	5.0 C (9.0 F)	38 years	27 of 100 (Routine)
14 April 2008	Heart Mtn, US	daily high max (Tie)	25.6 C (78.1 F)	tie	6 years	1 of 100 (Routine)
26 March 2008	Heart Mtn, US	daily rain	6.4 mm (0.25 in)	0.8 mm (0.03 in)	23 years	14 of 100 (Routine)
26 March 2008	Heart Mtn, US	daily snowfall (Tie)	10.2 cm (4.0 in)	tie	33 years	3 of 100 (Routine)
22 March 2008	Heart Mtn, US	daily snowfall	5.1 cm (2.0 in)	2.6 cm (1.0 in)	35 years	21 of 100 (Routine)
17 February 2008	Heart Mtn, US	daily snowfall	3.8 cm (1.5 in)	1.3 cm (0.5 in)	52 years	20 of 100 (Routine)
17 February 2008	Heart Mtn, US	daily rain	2.0 mm (0.08 in)	0.5 mm (0.02 in)	16 years	13 of 100 (Routine)
21 January 2008	Heart Mtn, US	daily snowfall (Tie)	2.5 cm (1.0 in)	tie	12 years	2 of 100 (Routine)
21 January 2008	Heart Mtn, US	daily rain (Tie)	1.3 mm (0.05 in)	tie	0 years	1 of 100 (Routine)
20 January 2008	Heart Mtn, US	daily rain	5.1 mm (0.20 in)	3.8 mm (0.15 in)	62 years	20 of 100 (Routine)

Climate Trend

56 complete years, 1943 to 2007

One stripe for each of 56 complete years at Heart Mtn, 1943 to 2007. Blue stripes are years cooler than the station's own mean of 7.2 C (44.9 F); red stripes are warmer. The coolest year was 1982, at 5.3 C (41.6 F), and the warmest was 1999, at 8.9 C (48.0 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Heart Mtn as warming stripes, 1943 to 2007
Year	Annual mean temperature	Difference from the station mean
1943	7.6 C	+0.48 C
1950	6.5 C	-0.69 C
1951	5.8 C	-1.40 C
1952	7.5 C	+0.32 C
1953	8.8 C	+1.62 C
1954	8.5 C	+1.39 C
1955	6.6 C	-0.58 C
1956	7.8 C	+0.63 C
1957	6.7 C	-0.48 C
1958	7.4 C	+0.26 C
1959	5.6 C	-1.59 C
1961	7.1 C	-0.10 C
1962	6.7 C	-0.41 C
1963	7.4 C	+0.27 C
1964	6.4 C	-0.73 C
1965	6.6 C	-0.53 C
1966	7.2 C	+0.05 C
1967	6.7 C	-0.42 C
1969	7.0 C	-0.16 C
1970	7.0 C	-0.20 C
1971	6.5 C	-0.63 C
1972	6.4 C	-0.75 C
1973	6.8 C	-0.37 C
1974	7.4 C	+0.27 C
1975	5.6 C	-1.55 C
1976	7.9 C	+0.74 C
1977	7.6 C	+0.48 C
1978	5.4 C	-1.74 C
1979	6.2 C	-0.95 C
1980	6.9 C	-0.25 C
1981	8.1 C	+0.99 C
1982	5.3 C	-1.83 C
1983	7.0 C	-0.11 C
1984	6.8 C	-0.36 C
1985	5.8 C	-1.32 C
1986	8.1 C	+0.95 C
1987	8.2 C	+1.05 C
1988	8.3 C	+1.15 C
1989	6.6 C	-0.55 C
1990	7.7 C	+0.51 C
1991	7.6 C	+0.47 C
1992	7.9 C	+0.78 C
1993	5.9 C	-1.30 C
1994	8.1 C	+0.94 C
1995	7.4 C	+0.25 C
1996	6.0 C	-1.12 C
1997	7.2 C	+0.05 C
1998	7.8 C	+0.63 C
1999	8.9 C	+1.74 C
2000	7.4 C	+0.29 C
2001	8.0 C	+0.84 C
2002	6.6 C	-0.58 C
2003	7.8 C	+0.67 C
2005	7.7 C	+0.59 C
2006	8.8 C	+1.60 C
2007	8.1 C	+0.92 C

The fitted trend in annual mean temperature here over 1943 to 2007 is 0.13 C (-0.01 to 0.26) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.23 F (-0.02 to 0.48) per decade. The slope is a straight line fitted to 56 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Heart Mtn
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.13 C (-0.01 to 0.26) per decade	0.23 F (-0.02 to 0.48) per decade	1943 to 2007	56	Not clearly different from zero
Mean daily maximum	0.1 C (-0.1 to 0.2) per decade	0.1 F (-0.2 to 0.4) per decade	1943 to 2007	56	Not clearly different from zero
Mean daily minimum	0.17 C (0.02 to 0.32) per decade	0.31 F (0.04 to 0.58) per decade	1943 to 2007	56	Rise

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

1942 to 2008

Yearly extremes at Heart Mtn: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.3 C (100.9 F)	1954	36.1 C (97.0 F)	64
Coldest night (TNn)	-38.9 C (-38.0 F)	1989	-29.1 C (-20.5 F)	64
Wettest day (Rx1day)	80.5 mm (3.2 in)	2001	23.3 mm (0.9 in)	64
Wettest five days (Rx5day)	99.8 mm (3.9 in)	2001	34.8 mm (1.4 in)	64
Longest dry spell (CDD)	107 days	1958	41 days	64

Hottest day (TXx)

The hottest day of the year at Heart Mtn, 1942 to 2008. The record is 38.3 C (100.9 F) in 1954, marked on the chart; the median year is 36.1 C (97.0 F).

Hottest day (TXx) at Heart Mtn by year
Year	Hottest day (TXx)
1942	16.7 C (62.1 F)
1943	36.7 C (98.1 F)
1944	35.6 C (96.1 F)
1945	36.7 C (98.1 F)
1949	37.8 C (100.0 F)
1950	36.1 C (97.0 F)
1951	35.6 C (96.1 F)
1952	36.7 C (98.1 F)
1953	37.8 C (100.0 F)
1954	38.3 C (100.9 F)
1955	38.3 C (100.9 F)
1956	35.0 C (95.0 F)
1957	36.1 C (97.0 F)
1958	37.2 C (99.0 F)
1959	35.6 C (96.1 F)
1960	36.7 C (98.1 F)
1961	36.7 C (98.1 F)
1962	35.0 C (95.0 F)
1963	35.0 C (95.0 F)
1964	36.7 C (98.1 F)
1965	34.4 C (93.9 F)
1966	36.1 C (97.0 F)
1967	33.9 C (93.0 F)
1968	33.9 C (93.0 F)
1969	36.1 C (97.0 F)
1970	35.6 C (96.1 F)
1971	36.1 C (97.0 F)
1972	33.9 C (93.0 F)
1973	36.7 C (98.1 F)
1974	35.0 C (95.0 F)
1975	36.7 C (98.1 F)
1976	36.7 C (98.1 F)
1977	36.1 C (97.0 F)
1978	34.4 C (93.9 F)
1979	34.4 C (93.9 F)
1980	33.3 C (91.9 F)
1981	36.7 C (98.1 F)
1982	34.4 C (93.9 F)
1983	37.8 C (100.0 F)
1984	35.6 C (96.1 F)
1985	36.7 C (98.1 F)
1986	36.7 C (98.1 F)
1987	35.0 C (95.0 F)
1988	37.8 C (100.0 F)
1989	36.7 C (98.1 F)
1990	36.7 C (98.1 F)
1991	35.0 C (95.0 F)
1992	32.2 C (90.0 F)
1993	31.1 C (88.0 F)
1994	33.3 C (91.9 F)
1995	36.7 C (98.1 F)
1996	33.9 C (93.0 F)
1997	33.3 C (91.9 F)
1998	36.1 C (97.0 F)
1999	35.6 C (96.1 F)
2000	35.0 C (95.0 F)
2001	36.1 C (97.0 F)
2002	37.2 C (99.0 F)
2003	36.1 C (97.0 F)
2004	33.3 C (91.9 F)
2005	37.2 C (99.0 F)
2006	35.6 C (96.1 F)
2007	35.6 C (96.1 F)
2008	32.2 C (90.0 F)

Coldest night (TNn)

The coldest night of the year at Heart Mtn, 1942 to 2008. The record is -38.9 C (-38.0 F) in 1989, marked on the chart; the median year is -29.1 C (-20.5 F).

Coldest night (TNn) at Heart Mtn by year
Year	Coldest night (TNn)
1942	-19.4 C (-2.9 F)
1943	-33.3 C (-27.9 F)
1944	-22.2 C (-8.0 F)
1945	-26.1 C (-15.0 F)
1949	-24.4 C (-11.9 F)
1950	-30.0 C (-22.0 F)
1951	-36.7 C (-34.1 F)
1952	-30.0 C (-22.0 F)
1953	-20.0 C (-4.0 F)
1954	-28.9 C (-20.0 F)
1955	-30.6 C (-23.1 F)
1956	-28.3 C (-18.9 F)
1957	-31.7 C (-25.1 F)
1958	-25.0 C (-13.0 F)
1959	-33.9 C (-29.0 F)
1960	-21.1 C (-6.0 F)
1961	-29.4 C (-20.9 F)
1962	-33.3 C (-27.9 F)
1963	-36.7 C (-34.1 F)
1964	-35.6 C (-32.1 F)
1965	-27.8 C (-18.0 F)
1966	-27.2 C (-17.0 F)
1967	-26.1 C (-15.0 F)
1968	-31.7 C (-25.1 F)
1969	-30.0 C (-22.0 F)
1970	-26.1 C (-15.0 F)
1971	-27.8 C (-18.0 F)
1972	-35.0 C (-31.0 F)
1973	-31.7 C (-25.1 F)
1974	-30.6 C (-23.1 F)
1975	-28.9 C (-20.0 F)
1976	-25.0 C (-13.0 F)
1977	-28.9 C (-20.0 F)
1978	-33.3 C (-27.9 F)
1979	-32.8 C (-27.0 F)
1980	-30.6 C (-23.1 F)
1981	-33.9 C (-29.0 F)
1982	-32.8 C (-27.0 F)
1983	-37.2 C (-35.0 F)
1984	-32.2 C (-26.0 F)
1985	-31.7 C (-25.1 F)
1986	-27.8 C (-18.0 F)
1987	-25.6 C (-14.1 F)
1988	-26.1 C (-15.0 F)
1989	-38.9 C (-38.0 F)
1990	-37.8 C (-36.0 F)
1991	-27.2 C (-17.0 F)
1992	-27.2 C (-17.0 F)
1993	-28.3 C (-18.9 F)
1994	-28.3 C (-18.9 F)
1995	-25.6 C (-14.1 F)
1996	-34.4 C (-29.9 F)
1997	-32.8 C (-27.0 F)
1998	-31.1 C (-24.0 F)
1999	-22.2 C (-8.0 F)
2000	-27.2 C (-17.0 F)
2001	-25.0 C (-13.0 F)
2002	-26.1 C (-15.0 F)
2003	-26.1 C (-15.0 F)
2004	-30.6 C (-23.1 F)
2005	-28.9 C (-20.0 F)
2006	-29.4 C (-20.9 F)
2007	-26.7 C (-16.1 F)
2008	-30.0 C (-22.0 F)

Wettest day (Rx1day)

The wettest day of the year at Heart Mtn, 1942 to 2008. The record is 80.5 mm (3.2 in) in 2001, marked on the chart; the median year is 23.3 mm (0.9 in).

Wettest day (Rx1day) at Heart Mtn by year
Year	Wettest day (Rx1day)
1942	6.1 mm (0.24 in)
1943	23.4 mm (0.9 in)
1944	19.1 mm (0.8 in)
1945	18.5 mm (0.7 in)
1949	5.1 mm (0.20 in)
1950	18.8 mm (0.7 in)
1951	42.4 mm (1.7 in)
1952	28.7 mm (1.1 in)
1953	14.5 mm (0.6 in)
1954	19.8 mm (0.8 in)
1955	24.9 mm (1.0 in)
1956	8.6 mm (0.34 in)
1957	34.3 mm (1.4 in)
1958	14.7 mm (0.6 in)
1959	16.3 mm (0.6 in)
1960	25.9 mm (1.0 in)
1961	33.8 mm (1.3 in)
1962	26.2 mm (1.0 in)
1963	34.3 mm (1.4 in)
1964	32.0 mm (1.3 in)
1965	34.8 mm (1.4 in)
1966	21.6 mm (0.9 in)
1967	25.7 mm (1.0 in)
1968	33.3 mm (1.3 in)
1969	39.9 mm (1.6 in)
1970	39.1 mm (1.5 in)
1971	25.9 mm (1.0 in)
1972	22.4 mm (0.9 in)
1973	22.4 mm (0.9 in)
1974	23.4 mm (0.9 in)
1975	25.1 mm (1.0 in)
1976	31.8 mm (1.3 in)
1977	20.3 mm (0.8 in)
1978	30.5 mm (1.2 in)
1979	20.3 mm (0.8 in)
1980	42.2 mm (1.7 in)
1981	21.6 mm (0.9 in)
1982	22.1 mm (0.9 in)
1983	23.1 mm (0.9 in)
1984	20.3 mm (0.8 in)
1985	21.6 mm (0.9 in)
1986	22.9 mm (0.9 in)
1987	30.5 mm (1.2 in)
1988	63.0 mm (2.5 in)
1989	16.5 mm (0.6 in)
1990	21.1 mm (0.8 in)
1991	22.9 mm (0.9 in)
1992	23.4 mm (0.9 in)
1993	27.9 mm (1.1 in)
1994	13.2 mm (0.5 in)
1995	17.3 mm (0.7 in)
1996	33.0 mm (1.3 in)
1997	16.0 mm (0.6 in)
1998	14.5 mm (0.6 in)
1999	28.7 mm (1.1 in)
2000	24.9 mm (1.0 in)
2001	80.5 mm (3.2 in)
2002	11.4 mm (0.4 in)
2003	14.5 mm (0.6 in)
2004	15.2 mm (0.6 in)
2005	25.7 mm (1.0 in)
2006	12.7 mm (0.5 in)
2007	38.1 mm (1.5 in)
2008	46.2 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Heart Mtn, 1942 to 2008. The record is 99.8 mm (3.9 in) in 2001, marked on the chart; the median year is 34.8 mm (1.4 in).

Wettest five days (Rx5day) at Heart Mtn by year
Year	Wettest five days (Rx5day)
1942	10.9 mm (0.4 in)
1943	32.8 mm (1.3 in)
1944	33.8 mm (1.3 in)
1945	21.0 mm (0.8 in)
1949	19.1 mm (0.8 in)
1950	25.2 mm (1.0 in)
1951	51.0 mm (2.0 in)
1952	53.2 mm (2.1 in)
1953	20.1 mm (0.8 in)
1954	27.4 mm (1.1 in)
1955	24.9 mm (1.0 in)
1956	10.4 mm (0.4 in)
1957	35.1 mm (1.4 in)
1958	26.4 mm (1.0 in)
1959	20.1 mm (0.8 in)
1960	25.9 mm (1.0 in)
1961	59.4 mm (2.3 in)
1962	42.4 mm (1.7 in)
1963	54.1 mm (2.1 in)
1964	57.1 mm (2.2 in)
1965	43.0 mm (1.7 in)
1966	21.6 mm (0.9 in)
1967	48.5 mm (1.9 in)
1968	48.0 mm (1.9 in)
1969	57.3 mm (2.3 in)
1970	42.1 mm (1.7 in)
1971	48.9 mm (1.9 in)
1972	28.5 mm (1.1 in)
1973	24.9 mm (1.0 in)
1974	37.3 mm (1.5 in)
1975	52.5 mm (2.1 in)
1976	40.0 mm (1.6 in)
1977	38.4 mm (1.5 in)
1978	62.2 mm (2.4 in)
1979	28.7 mm (1.1 in)
1980	59.8 mm (2.4 in)
1981	41.1 mm (1.6 in)
1982	34.5 mm (1.4 in)
1983	37.6 mm (1.5 in)
1984	30.8 mm (1.2 in)
1985	25.9 mm (1.0 in)
1986	39.7 mm (1.6 in)
1987	70.0 mm (2.8 in)
1988	63.0 mm (2.5 in)
1989	29.2 mm (1.1 in)
1990	30.0 mm (1.2 in)
1991	46.1 mm (1.8 in)
1992	51.6 mm (2.0 in)
1993	35.6 mm (1.4 in)
1994	23.2 mm (0.9 in)
1995	30.8 mm (1.2 in)
1996	43.7 mm (1.7 in)
1997	27.2 mm (1.1 in)
1998	28.2 mm (1.1 in)
1999	30.0 mm (1.2 in)
2000	31.3 mm (1.2 in)
2001	99.8 mm (3.9 in)
2002	18.0 mm (0.7 in)
2003	23.8 mm (0.9 in)
2004	27.9 mm (1.1 in)
2005	59.2 mm (2.3 in)
2006	20.3 mm (0.8 in)
2007	46.2 mm (1.8 in)
2008	73.4 mm (2.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Heart Mtn, 1942 to 2008. The record is 107 days in 1958, marked on the chart; the median year is 41 days.

Longest dry spell (CDD) at Heart Mtn by year
Year	Longest dry spell (CDD)
1942	24 days
1943	32 days
1944	39 days
1945	37 days
1949	38 days
1950	40 days
1951	44 days
1952	69 days
1953	54 days
1954	81 days
1955	68 days
1956	81 days
1957	50 days
1958	107 days
1959	46 days
1960	28 days
1961	59 days
1962	41 days
1963	38 days
1964	47 days
1965	76 days
1966	60 days
1967	30 days
1968	39 days
1969	88 days
1970	66 days
1971	42 days
1972	28 days
1973	38 days
1974	48 days
1975	31 days
1976	86 days
1977	45 days
1978	36 days
1979	54 days
1980	31 days
1981	31 days
1982	26 days
1983	44 days
1984	29 days
1985	50 days
1986	51 days
1987	28 days
1988	58 days
1989	36 days
1990	48 days
1991	46 days
1992	53 days
1993	52 days
1994	26 days
1995	31 days
1996	38 days
1997	27 days
1998	30 days
1999	52 days
2000	24 days
2001	56 days
2002	37 days
2003	33 days
2004	53 days
2005	33 days
2006	30 days
2007	31 days
2008	24 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

56 years with a frost

Across 56 years with a frost, the median last spring frost at Heart Mtn falls on 21 May and the median first autumn frost on 16 September, which leaves a median of 121 days between them.

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

Frost dates and growing season at Heart Mtn
Measure	Median, all years	Earliest period	Recent period (1977 to 2007)	Recent against earliest	Fitted trend
Last spring frost	21 May	n/a	21 May	n/a	+0.9 days per decade
First autumn frost	16 September	n/a	19 September	n/a	+0.5 days per decade
Growing days	121 days	n/a	121 days	n/a	-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

58 years, 1943 to 2007

A day with at least 23.6 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 66.9 mm (2.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Heart Mtn: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	23.6 mm (0.9 in)
5 years	33.2 mm (1.3 in)
10 years	40.3 mm (1.6 in)
25 years	50.2 mm (2.0 in)
50 years	58.2 mm (2.3 in)
100 years	66.9 mm (2.6 in)	Longer than the 58 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, 58 years of values from 1943 to 2007.

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: 80.5 mm (3.2 in) in 2001; 63.0 mm (2.5 in) in 1988; 42.4 mm (1.7 in) in 1951.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

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