S Mtn Weather Records (USC00368308)

Record envelope, standing records and threshold days for S Mtn (USC00368308), Pennsylvania, United States, with 83 years of record.

Key Facts for S Mtn

S Mtn (USC00368308) is a weather station in Pennsylvania, United States at 39.85 latitude and -77.50 longitude, 463 m (1,520 ft) above sea level.
The station reports from 1940 to 2022, 83 years of record.
1,464 records set at S Mtn still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
S Mtn set a daily record precipitation of 49.8 mm (2.0 in) on 7 May 2022.

About the Station

Location: Pennsylvania, United States, 39.85 latitude, -77.50 longitude.
Elevation: 463 m (1,520 ft).
Period of record: 1940 to 2022, 83 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 S 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 S 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)	-24.4 C (-11.9 F)	n/a	n/a
Feb	23.9 C (75.0 F)	-22.8 C (-9.0 F)	n/a	n/a
Mar	25.0 C (77.0 F)	-21.7 C (-7.1 F)	n/a	n/a
Apr	30.6 C (87.1 F)	-8.9 C (16.0 F)	n/a	n/a
May	33.3 C (91.9 F)	-3.9 C (25.0 F)	n/a	n/a
Jun	36.7 C (98.1 F)	4.4 C (39.9 F)	n/a	n/a
Jul	36.7 C (98.1 F)	6.7 C (44.1 F)	n/a	n/a
Aug	35.0 C (95.0 F)	7.2 C (45.0 F)	n/a	n/a
Sep	32.8 C (91.0 F)	2.2 C (36.0 F)	n/a	n/a
Oct	30.0 C (86.0 F)	-7.8 C (18.0 F)	n/a	n/a
Nov	23.9 C (75.0 F)	-11.7 C (10.9 F)	n/a	n/a
Dec	20.6 C (69.1 F)	-18.3 C (-0.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at S Mtn still stand. 2007 holds the most, with 104.

Standing records at S Mtn by the year they were set
Year set	Standing records
1943	21
1947	3
1948	12
1963	17
1964	12
1965	25
1966	17
1968	8
1969	27
1970	60
1973	11
1976	14
1978	4
2005	40
2006	75
2007	104
2008	69
2009	83
2010	70
2011	68
2012	70
2013	79
2014	92
2015	84
2016	67
2017	87
2018	75
2019	52
2020	58
2021	24
2022	36

All-Time Record Progression

7 new records

7 all-time records were set at S Mtn between 22 June 1972 and 18 February 2003. Each dot is a new record.

When S Mtn set new all-time records
Date	Kind	Detail
1972-06-22	Record daily precipitation	Record daily precipitation 158.8 mm (6.3 in)
1979-09-06	Record daily precipitation	Record daily precipitation 160.5 mm (6.3 in)
1983-02-12	Record daily snowfall	Record daily snowfall 58.4 cm (23.0 in)
1996-01-08	Record daily snowfall	Record daily snowfall 63.5 cm (25.0 in)
1996-01-12	Record snow depth	Record snow depth 91.4 cm (36.0 in)
1996-01-13	Record snow depth	Record snow depth 116.8 cm (46.0 in)
2003-02-18	Record daily snowfall	Record daily snowfall 68.6 cm (27.0 in)

Wettest Day of Each Month

Sep: 160.5 mm (6.3 in)

The wettest day on record for each calendar month at S Mtn. The most was 160.5 mm (6.3 in) on 6 September 1979.

Record daily precipitation for each month at S Mtn
Month	Record daily precipitation (mm)	Date
Jan	73.7 mm (2.9 in)	4 January 1944
Feb	70.6 mm (2.8 in)	24 February 1998
Mar	74.2 mm (2.9 in)	29 March 1984
Apr	81.8 mm (3.2 in)	22 April 1992
May	108.7 mm (4.3 in)	16 May 2014
Jun	158.8 mm (6.3 in)	22 June 1972
Jul	88.1 mm (3.5 in)	22 July 2018
Aug	105.7 mm (4.2 in)	7 August 1940
Sep	160.5 mm (6.3 in)	6 September 1979
Oct	134.9 mm (5.3 in)	30 October 2012
Nov	143.0 mm (5.6 in)	22 November 1952
Dec	120.1 mm (4.7 in)	11 December 1992

Period of Record Coverage

1948 to 2022

29 years of record at S Mtn, 1948 to 2022. 14 years have data for under 90 percent of days and are left out of rankings: 1948, 1963, 1964, 1965, 1966, 1968, 1969, 1970 and others.

Days with data per year at S Mtn
Year	Days with data	Share of year	Complete
1948	8	2%	No
1963	31	8%	No
1964	31	8%	No
1965	118	32%	No
1966	39	11%	No
1968	30	8%	No
1969	60	16%	No
1970	122	33%	No
1973	30	8%	No
1976	40	11%	No
1978	30	8%	No
2005	152	42%	No
2006	365	100%	Yes
2007	363	99%	Yes
2008	364	99%	Yes
2009	333	91%	Yes
2010	364	100%	Yes
2011	365	100%	Yes
2012	366	100%	Yes
2013	364	100%	Yes
2014	365	100%	Yes
2015	365	100%	Yes
2016	365	100%	Yes
2017	365	100%	Yes
2018	365	100%	Yes
2019	341	93%	Yes
2020	366	100%	Yes
2021	218	60%	No
2022	304	83%	No

Latest Records

Latest records at S Mtn
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
7 May 2022	S Mtn, US	daily rain	49.8 mm (2.0 in)	5.1 mm (0.20 in)	77 years	35 of 100 (Notable)
19 April 2022	S Mtn, US	daily snowfall	7.9 cm (3.1 in)	7.4 cm (2.9 in)	65 years	45 of 100 (Notable)
19 April 2022	S Mtn, US	daily snow depth	5.1 cm (2.0 in)	5.1 cm (2.0 in)	80 years	20 of 100 (Routine)
19 April 2022	S Mtn, US	daily rain	18.8 mm (0.7 in)	4.6 mm (0.18 in)	19 years	17 of 100 (Routine)
13 March 2022	S Mtn, US	daily snowfall	12.2 cm (4.8 in)	0.8 cm (0.3 in)	28 years	16 of 100 (Routine)
17 January 2022	S Mtn, US	daily rain (Tie)	21.3 mm (0.8 in)	tie	76 years	7 of 100 (Routine)
23 September 2021	S Mtn, US	daily rain	67.8 mm (2.7 in)	17.0 mm (0.7 in)	46 years	30 of 100 (Routine)
2 September 2021	S Mtn, US	daily rain	121.7 mm (4.8 in)	48.8 mm (1.9 in)	15 years	39 of 100 (Notable)
2 February 2021	S Mtn, US	daily snowfall	21.3 cm (8.4 in)	13.4 cm (5.3 in)	2 years	22 of 100 (Routine)
1 February 2021	S Mtn, US	daily snowfall	16.0 cm (6.3 in)	10.9 cm (4.3 in)	71 years	41 of 100 (Notable)
25 December 2020	S Mtn, US	daily rain	57.2 mm (2.3 in)	15.3 mm (0.6 in)	41 years	33 of 100 (Routine)
18 December 2020	S Mtn, US	daily snow depth	25.4 cm (10.0 in)	7.6 cm (3.0 in)	69 years	38 of 100 (Notable)
17 December 2020	S Mtn, US	daily snowfall	23.1 cm (9.1 in)	7.9 cm (3.1 in)	47 years	35 of 100 (Notable)
17 December 2020	S Mtn, US	daily snow depth	25.4 cm (10.0 in)	7.6 cm (3.0 in)	28 years	26 of 100 (Routine)
10 May 2020	S Mtn, US	monthly snowfall	0.5 cm (0.2 in)	0.5 cm (0.2 in)	79 years	20 of 100 (Routine)
1 May 2020	S Mtn, US	daily rain	72.4 mm (2.9 in)	4.1 mm (0.16 in)	26 years	18 of 100 (Routine)
15 April 2020	S Mtn, US	daily snowfall	1.8 cm (0.7 in)	1.8 cm (0.7 in)	78 years	20 of 100 (Routine)
16 December 2019	S Mtn, US	daily snowfall (Tie)	7.6 cm (3.0 in)	tie	38 years	4 of 100 (Routine)
1 November 2019	S Mtn, US	daily rain	44.2 mm (1.7 in)	6.1 mm (0.24 in)	68 years	32 of 100 (Routine)
20 May 2019	S Mtn, US	daily rain	56.9 mm (2.2 in)	22.6 mm (0.9 in)	46 years	41 of 100 (Notable)

Climate Trend

13 complete years, 2006 to 2020

One stripe for each of 13 complete years at S Mtn, 2006 to 2020. Blue stripes are years cooler than the station's own mean of 10.1 C (50.2 F); red stripes are warmer. The coolest year was 2014, at 8.5 C (47.4 F), and the warmest was 2020, at 11.3 C (52.4 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at S Mtn as warming stripes, 2006 to 2020
Year	Annual mean temperature	Difference from the station mean
2006	10.5 C	+0.39 C
2007	9.8 C	-0.31 C
2008	9.4 C	-0.65 C
2010	9.9 C	-0.20 C
2011	10.4 C	+0.32 C
2012	10.8 C	+0.73 C
2013	9.4 C	-0.71 C
2014	8.5 C	-1.56 C
2015	9.9 C	-0.24 C
2016	10.7 C	+0.58 C
2017	10.6 C	+0.49 C
2018	10.0 C	-0.08 C
2020	11.3 C	+1.23 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

1940 to 2022

Yearly extremes at S Mtn: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.7 C (98.1 F)	1969	32.2 C (90.0 F)	29
Coldest night (TNn)	-24.4 C (-11.9 F)	1948	-15.6 C (3.9 F)	31
Wettest day (Rx1day)	160.5 mm (6.3 in)	1979	70.6 mm (2.8 in)	83
Wettest five days (Rx5day)	332.3 mm (13.1 in)	1972	104.4 mm (4.1 in)	83
Longest dry spell (CDD)	35 days	1947	16 days	83

Hottest day (TXx)

The hottest day of the year at S Mtn, 1940 to 2022. The record is 36.7 C (98.1 F) in 1969, marked on the chart; the median year is 32.2 C (90.0 F).

Hottest day (TXx) at S Mtn by year
Year	Hottest day (TXx)
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	15.0 C (59.0 F)
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	28.3 C (82.9 F)
1964	33.3 C (91.9 F)
1965	34.4 C (93.9 F)
1966	30.6 C (87.1 F)
1967	n/a
1968	28.9 C (84.0 F)
1969	36.7 C (98.1 F)
1970	35.6 C (96.1 F)
1971	n/a
1972	n/a
1973	20.0 C (68.0 F)
1974	n/a
1975	n/a
1976	30.6 C (87.1 F)
1977	n/a
1978	31.1 C (88.0 F)
1979	n/a
1980	n/a
1981	n/a
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
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	33.3 C (91.9 F)
2006	32.8 C (91.0 F)
2007	32.8 C (91.0 F)
2008	31.7 C (89.1 F)
2009	30.6 C (87.1 F)
2010	34.4 C (93.9 F)
2011	36.1 C (97.0 F)
2012	34.4 C (93.9 F)
2013	32.2 C (90.0 F)
2014	31.1 C (88.0 F)
2015	31.1 C (88.0 F)
2016	32.2 C (90.0 F)
2017	31.7 C (89.1 F)
2018	32.2 C (90.0 F)
2019	33.3 C (91.9 F)
2020	33.3 C (91.9 F)
2021	30.6 C (87.1 F)
2022	32.2 C (90.0 F)

Coldest night (TNn)

The coldest night of the year at S Mtn, 1940 to 2022. The record is -24.4 C (-11.9 F) in 1948, marked on the chart; the median year is -15.6 C (3.9 F).

Coldest night (TNn) at S Mtn by year
Year	Coldest night (TNn)
1940	n/a
1941	n/a
1942	n/a
1943	-8.9 C (16.0 F)
1944	n/a
1945	n/a
1946	n/a
1947	-13.9 C (7.0 F)
1948	-24.4 C (-11.9 F)
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	-2.2 C (28.0 F)
1964	1.1 C (34.0 F)
1965	-19.4 C (-2.9 F)
1966	-3.9 C (25.0 F)
1967	n/a
1968	-5.6 C (21.9 F)
1969	6.7 C (44.1 F)
1970	-2.8 C (27.0 F)
1971	n/a
1972	n/a
1973	-7.8 C (18.0 F)
1974	n/a
1975	n/a
1976	-7.8 C (18.0 F)
1977	n/a
1978	-2.8 C (27.0 F)
1979	n/a
1980	n/a
1981	n/a
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
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	-18.3 C (-0.9 F)
2006	-15.6 C (3.9 F)
2007	-18.9 C (-2.0 F)
2008	-17.2 C (1.0 F)
2009	-21.7 C (-7.1 F)
2010	-17.2 C (1.0 F)
2011	-20.0 C (-4.0 F)
2012	-14.4 C (6.1 F)
2013	-15.6 C (3.9 F)
2014	-22.2 C (-8.0 F)
2015	-22.8 C (-9.0 F)
2016	-18.3 C (-0.9 F)
2017	-16.1 C (3.0 F)
2018	-20.0 C (-4.0 F)
2019	-21.1 C (-6.0 F)
2020	-12.8 C (9.0 F)
2021	-12.8 C (9.0 F)
2022	-19.4 C (-2.9 F)

Wettest day (Rx1day)

The wettest day of the year at S Mtn, 1940 to 2022. The record is 160.5 mm (6.3 in) in 1979, marked on the chart; the median year is 70.6 mm (2.8 in).

Wettest day (Rx1day) at S Mtn by year
Year	Wettest day (Rx1day)
1940	105.7 mm (4.2 in)
1941	38.6 mm (1.5 in)
1942	70.1 mm (2.8 in)
1943	57.4 mm (2.3 in)
1944	73.7 mm (2.9 in)
1945	69.1 mm (2.7 in)
1946	73.7 mm (2.9 in)
1947	52.1 mm (2.1 in)
1948	72.6 mm (2.9 in)
1949	69.6 mm (2.7 in)
1950	108.2 mm (4.3 in)
1951	48.5 mm (1.9 in)
1952	143.0 mm (5.6 in)
1953	57.7 mm (2.3 in)
1954	103.6 mm (4.1 in)
1955	91.7 mm (3.6 in)
1956	65.5 mm (2.6 in)
1957	99.6 mm (3.9 in)
1958	55.9 mm (2.2 in)
1959	65.3 mm (2.6 in)
1960	64.8 mm (2.6 in)
1961	60.2 mm (2.4 in)
1962	99.1 mm (3.9 in)
1963	63.0 mm (2.5 in)
1964	50.0 mm (2.0 in)
1965	61.5 mm (2.4 in)
1966	121.9 mm (4.8 in)
1967	75.7 mm (3.0 in)
1968	72.4 mm (2.9 in)
1969	84.6 mm (3.3 in)
1970	77.7 mm (3.1 in)
1971	47.0 mm (1.9 in)
1972	158.8 mm (6.3 in)
1973	56.4 mm (2.2 in)
1974	53.1 mm (2.1 in)
1975	114.8 mm (4.5 in)
1976	64.8 mm (2.6 in)
1977	42.4 mm (1.7 in)
1978	48.3 mm (1.9 in)
1979	160.5 mm (6.3 in)
1980	41.1 mm (1.6 in)
1981	58.9 mm (2.3 in)
1982	78.5 mm (3.1 in)
1983	91.4 mm (3.6 in)
1984	74.2 mm (2.9 in)
1985	61.5 mm (2.4 in)
1986	81.3 mm (3.2 in)
1987	52.1 mm (2.1 in)
1988	70.6 mm (2.8 in)
1989	56.6 mm (2.2 in)
1990	111.8 mm (4.4 in)
1991	65.8 mm (2.6 in)
1992	120.1 mm (4.7 in)
1993	77.5 mm (3.1 in)
1994	86.4 mm (3.4 in)
1995	71.1 mm (2.8 in)
1996	115.8 mm (4.6 in)
1997	104.9 mm (4.1 in)
1998	70.6 mm (2.8 in)
1999	66.0 mm (2.6 in)
2000	44.7 mm (1.8 in)
2001	36.8 mm (1.4 in)
2002	50.8 mm (2.0 in)
2003	62.2 mm (2.4 in)
2004	112.0 mm (4.4 in)
2005	99.1 mm (3.9 in)
2006	142.7 mm (5.6 in)
2007	63.5 mm (2.5 in)
2008	63.8 mm (2.5 in)
2009	37.6 mm (1.5 in)
2010	72.4 mm (2.9 in)
2011	76.5 mm (3.0 in)
2012	134.9 mm (5.3 in)
2013	94.0 mm (3.7 in)
2014	108.7 mm (4.3 in)
2015	48.0 mm (1.9 in)
2016	45.2 mm (1.8 in)
2017	58.7 mm (2.3 in)
2018	88.1 mm (3.5 in)
2019	63.5 mm (2.5 in)
2020	72.4 mm (2.9 in)
2021	121.7 mm (4.8 in)
2022	49.8 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at S Mtn, 1940 to 2022. The record is 332.3 mm (13.1 in) in 1972, marked on the chart; the median year is 104.4 mm (4.1 in).

Wettest five days (Rx5day) at S Mtn by year
Year	Wettest five days (Rx5day)
1940	105.7 mm (4.2 in)
1941	76.7 mm (3.0 in)
1942	115.2 mm (4.5 in)
1943	89.0 mm (3.5 in)
1944	84.6 mm (3.3 in)
1945	113.0 mm (4.4 in)
1946	87.1 mm (3.4 in)
1947	70.6 mm (2.8 in)
1948	89.7 mm (3.5 in)
1949	175.8 mm (6.9 in)
1950	126.0 mm (5.0 in)
1951	127.0 mm (5.0 in)
1952	210.6 mm (8.3 in)
1953	70.9 mm (2.8 in)
1954	104.1 mm (4.1 in)
1955	131.4 mm (5.2 in)
1956	77.0 mm (3.0 in)
1957	130.2 mm (5.1 in)
1958	111.0 mm (4.4 in)
1959	84.6 mm (3.3 in)
1960	87.9 mm (3.5 in)
1961	93.4 mm (3.7 in)
1962	101.2 mm (4.0 in)
1963	83.8 mm (3.3 in)
1964	63.0 mm (2.5 in)
1965	87.9 mm (3.5 in)
1966	178.1 mm (7.0 in)
1967	101.1 mm (4.0 in)
1968	97.0 mm (3.8 in)
1969	122.2 mm (4.8 in)
1970	89.1 mm (3.5 in)
1971	91.9 mm (3.6 in)
1972	332.3 mm (13.1 in)
1973	107.3 mm (4.2 in)
1974	91.5 mm (3.6 in)
1975	259.3 mm (10.2 in)
1976	109.7 mm (4.3 in)
1977	82.2 mm (3.2 in)
1978	128.8 mm (5.1 in)
1979	161.0 mm (6.3 in)
1980	68.3 mm (2.7 in)
1981	108.2 mm (4.3 in)
1982	87.4 mm (3.4 in)
1983	111.4 mm (4.4 in)
1984	102.6 mm (4.0 in)
1985	122.7 mm (4.8 in)
1986	91.0 mm (3.6 in)
1987	86.9 mm (3.4 in)
1988	130.6 mm (5.1 in)
1989	102.9 mm (4.1 in)
1990	161.9 mm (6.4 in)
1991	70.6 mm (2.8 in)
1992	158.2 mm (6.2 in)
1993	120.0 mm (4.7 in)
1994	143.6 mm (5.7 in)
1995	116.2 mm (4.6 in)
1996	135.6 mm (5.3 in)
1997	114.5 mm (4.5 in)
1998	93.8 mm (3.7 in)
1999	83.5 mm (3.3 in)
2000	74.9 mm (2.9 in)
2001	49.5 mm (1.9 in)
2002	95.1 mm (3.7 in)
2003	113.3 mm (4.5 in)
2004	118.9 mm (4.7 in)
2005	122.3 mm (4.8 in)
2006	261.7 mm (10.3 in)
2007	82.8 mm (3.3 in)
2008	116.1 mm (4.6 in)
2009	84.3 mm (3.3 in)
2010	164.9 mm (6.5 in)
2011	169.2 mm (6.7 in)
2012	167.2 mm (6.6 in)
2013	163.7 mm (6.4 in)
2014	110.2 mm (4.3 in)
2015	81.0 mm (3.2 in)
2016	86.6 mm (3.4 in)
2017	96.3 mm (3.8 in)
2018	216.1 mm (8.5 in)
2019	72.6 mm (2.9 in)
2020	99.6 mm (3.9 in)
2021	140.8 mm (5.5 in)
2022	104.4 mm (4.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at S Mtn, 1940 to 2022. The record is 35 days in 1947, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at S Mtn by year
Year	Longest dry spell (CDD)
1940	20 days
1941	28 days
1942	14 days
1943	19 days
1944	18 days
1945	10 days
1946	14 days
1947	35 days
1948	10 days
1949	14 days
1950	15 days
1951	16 days
1952	29 days
1953	20 days
1954	14 days
1955	21 days
1956	16 days
1957	15 days
1958	20 days
1959	12 days
1960	17 days
1961	16 days
1962	16 days
1963	31 days
1964	18 days
1965	14 days
1966	21 days
1967	13 days
1968	26 days
1969	17 days
1970	16 days
1971	20 days
1972	16 days
1973	25 days
1974	18 days
1975	13 days
1976	19 days
1977	17 days
1978	18 days
1979	15 days
1980	10 days
1981	15 days
1982	16 days
1983	22 days
1984	14 days
1985	14 days
1986	21 days
1987	23 days
1988	29 days
1989	16 days
1990	14 days
1991	23 days
1992	15 days
1993	13 days
1994	17 days
1995	25 days
1996	10 days
1997	12 days
1998	19 days
1999	17 days
2000	22 days
2001	33 days
2002	19 days
2003	10 days
2004	16 days
2005	26 days
2006	17 days
2007	15 days
2008	25 days
2009	15 days
2010	23 days
2011	19 days
2012	16 days
2013	12 days
2014	11 days
2015	14 days
2016	13 days
2017	16 days
2018	12 days
2019	13 days
2020	25 days
2021	16 days
2022	13 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

78 years, 1941 to 2020

A day with at least 70.4 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 179.7 mm (7.1 in) of rain is expected about once in 100 years.

Rainfall return levels at S 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	70.4 mm (2.8 in)
5 years	95.4 mm (3.8 in)
10 years	113.5 mm (4.5 in)
25 years	138.3 mm (5.4 in)
50 years	158.4 mm (6.2 in)
100 years	179.7 mm (7.1 in)	Longer than the 78 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, 78 years of values from 1941 to 2020.

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: 160.5 mm (6.3 in) in 1979; 158.8 mm (6.3 in) in 1972; 143.0 mm (5.6 in) in 1952.

Download the Data

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