Rotan Weather Records (USC00417782)

Record envelope, standing records and threshold days for Rotan (USC00417782), Texas, United States, with 97 years of record.

Key Facts for Rotan

Rotan (USC00417782) is a weather station in Texas, United States at 32.86 latitude and -100.46 longitude, 608 m (1,995 ft) above sea level.
The station reports from 1924 to 2020, 97 years of record.
1,464 records set at Rotan still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Rotan tied a daily record high minimum temperature of 26.7 C (80.1 F) on 30 August 2020.

About the Station

Location: Texas, United States, 32.86 latitude, -100.46 longitude.
Elevation: 608 m (1,995 ft).
Period of record: 1924 to 2020, 97 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 Rotan. 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 Rotan, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	29.4 C (84.9 F)	-16.1 C (3.0 F)	n/a	n/a
Feb	33.3 C (91.9 F)	-20.6 C (-5.1 F)	n/a	n/a
Mar	37.8 C (100.0 F)	-13.9 C (7.0 F)	n/a	n/a
Apr	41.1 C (106.0 F)	-4.4 C (24.1 F)	n/a	n/a
May	43.3 C (109.9 F)	1.7 C (35.1 F)	n/a	n/a
Jun	46.7 C (116.1 F)	7.8 C (46.0 F)	n/a	n/a
Jul	44.4 C (111.9 F)	13.9 C (57.0 F)	n/a	n/a
Aug	44.4 C (111.9 F)	12.2 C (54.0 F)	n/a	n/a
Sep	42.2 C (108.0 F)	1.7 C (35.1 F)	n/a	n/a
Oct	38.3 C (100.9 F)	-6.7 C (19.9 F)	n/a	n/a
Nov	33.3 C (91.9 F)	-9.4 C (15.1 F)	n/a	n/a
Dec	28.9 C (84.0 F)	-20.6 C (-5.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Rotan still stand. 2011 holds the most, with 61.

Standing records at Rotan by the year they were set
Year set	Standing records
1962	13
1963	36
1964	28
1965	36
1966	37
1967	38
1968	17
1969	37
1970	40
1971	32
1972	23
1973	20
1974	36
1975	23
1976	28
1977	21
1978	34
1979	22
1980	26
1981	14
1982	29
1983	30
1984	26
1985	21
1986	27
1987	18
1988	9
1989	38
1990	21
1991	24
1992	14
1993	14
1994	18
1995	24
1996	30
1997	24
1998	21
1999	14
2000	38
2001	14
2002	15
2003	23
2004	11
2005	23
2006	25
2007	22
2008	14
2009	26
2010	16
2011	61
2012	30
2013	27
2014	25
2015	17
2016	12
2017	24
2018	41
2019	22
2020	15

All-Time Record Progression

10 new records

10 all-time records were set at Rotan between 12 May 1965 and 20 July 2019. Each dot is a new record.

When Rotan set new all-time records
Date	Kind	Detail
1965-05-12	Record daily precipitation	Record daily precipitation 123.2 mm (4.9 in)
1965-10-18	Record daily precipitation	Record daily precipitation 158.8 mm (6.3 in)
1972-08-13	Record daily precipitation	Record daily precipitation 174.0 mm (6.9 in)
1994-06-26	Record high maximum temperature	Record high maximum temperature 45.0 C (113.0 F)
1994-06-27	Record high maximum temperature	Record high maximum temperature 46.7 C (116.1 F)
2001-11-27	Record snow depth	Record snow depth 25.4 cm (10.0 in)
2011-06-18	Record high minimum temperature	Record high minimum temperature 28.3 C (82.9 F)
2011-08-09	Record high minimum temperature	Record high minimum temperature 28.9 C (84.0 F)
2017-09-20	Record high minimum temperature	Record high minimum temperature 30.0 C (86.0 F)
2019-07-20	Record high minimum temperature	Record high minimum temperature 31.1 C (88.0 F)

Wettest Day of Each Month

Aug: 174.0 mm (6.9 in)

The wettest day on record for each calendar month at Rotan. The most was 174.0 mm (6.9 in) on 13 August 1972.

Record daily precipitation for each month at Rotan
Month	Record daily precipitation (mm)	Date
Jan	46.5 mm (1.8 in)	15 January 1932
Feb	71.1 mm (2.8 in)	15 February 1938
Mar	128.3 mm (5.1 in)	23 March 2000
Apr	87.1 mm (3.4 in)	18 April 1990
May	123.2 mm (4.9 in)	12 May 1965
Jun	110.5 mm (4.4 in)	18 June 1926
Jul	97.8 mm (3.9 in)	1 July 2009
Aug	174.0 mm (6.9 in)	13 August 1972
Sep	94.0 mm (3.7 in)	3 September 1966
Oct	158.8 mm (6.3 in)	18 October 1965
Nov	74.4 mm (2.9 in)	7 November 2019
Dec	55.9 mm (2.2 in)	5 December 1926

Period of Record Coverage

1962 to 2020

59 years of record at Rotan, 1962 to 2020. 18 years have data for under 90 percent of days and are left out of rankings: 1962, 1979, 1982, 1983, 1984, 1985, 1986, 1989 and others.

Days with data per year at Rotan
Year	Days with data	Share of year	Complete
1962	214	59%	No
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	361	99%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	364	100%	Yes
1970	359	98%	Yes
1971	364	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	364	100%	Yes
1975	363	99%	Yes
1976	364	99%	Yes
1977	365	100%	Yes
1978	333	91%	Yes
1979	298	82%	No
1980	366	100%	Yes
1981	365	100%	Yes
1982	322	88%	No
1983	317	87%	No
1984	306	84%	No
1985	289	79%	No
1986	327	90%	No
1987	332	91%	Yes
1988	331	90%	Yes
1989	298	82%	No
1990	325	89%	No
1991	297	81%	No
1992	293	80%	No
1993	296	81%	No
1994	286	78%	No
1995	327	90%	No
1996	328	90%	No
1997	352	96%	Yes
1998	357	98%	Yes
1999	362	99%	Yes
2000	365	100%	Yes
2001	363	99%	Yes
2002	348	95%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	357	98%	Yes
2007	360	99%	Yes
2008	362	99%	Yes
2009	360	99%	Yes
2010	361	99%	Yes
2011	360	99%	Yes
2012	357	98%	Yes
2013	345	95%	Yes
2014	338	93%	Yes
2015	336	92%	Yes
2016	314	86%	No
2017	332	91%	Yes
2018	331	91%	Yes
2019	213	58%	No
2020	150	41%	No

Latest Records

Latest records at Rotan
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 August 2020	Rotan, US	daily high min (Tie)	26.7 C (80.1 F)	tie	9 years	1 of 100 (Routine)
23 August 2020	Rotan, US	monthly high min (Tie)	28.9 C (84.0 F)	tie	9 years	4 of 100 (Routine)
17 August 2020	Rotan, US	daily high min	26.1 C (79.0 F)	0.5 C (0.9 F)	1 year	7 of 100 (Routine)
16 August 2020	Rotan, US	daily high max	42.2 C (108.0 F)	1.1 C (2.0 F)	51 years	23 of 100 (Routine)
15 August 2020	Rotan, US	monthly high max	44.4 C (111.9 F)	0.5 C (0.9 F)	56 years	32 of 100 (Routine)
14 August 2020	Rotan, US	daily high max (Tie)	42.2 C (108.0 F)	tie	51 years	5 of 100 (Routine)
12 August 2020	Rotan, US	daily high min	27.2 C (81.0 F)	0.5 C (0.9 F)	1 year	7 of 100 (Routine)
30 June 2020	Rotan, US	daily high max	42.2 C (108.0 F)	1.6 C (2.9 F)	40 years	21 of 100 (Routine)
10 June 2020	Rotan, US	daily low min	11.7 C (53.1 F)	1.6 C (2.9 F)	46 years	23 of 100 (Routine)
9 June 2020	Rotan, US	daily high max (Tie)	41.1 C (106.0 F)	tie	9 years	1 of 100 (Routine)
20 May 2020	Rotan, US	daily high max	41.7 C (107.1 F)	2.3 C (4.1 F)	47 years	23 of 100 (Routine)
5 May 2020	Rotan, US	daily high max	41.1 C (106.0 F)	2.2 C (4.0 F)	8 years	11 of 100 (Routine)
4 May 2020	Rotan, US	daily high min	23.9 C (75.0 F)	2.2 C (4.0 F)	55 years	26 of 100 (Routine)
3 May 2020	Rotan, US	daily high max	41.7 C (107.1 F)	3.9 C (7.0 F)	24 years	19 of 100 (Routine)
3 May 2020	Rotan, US	daily high min	23.9 C (75.0 F)	2.8 C (5.0 F)	8 years	13 of 100 (Routine)
2 May 2020	Rotan, US	daily high max	38.9 C (102.0 F)	2.2 C (4.0 F)	46 years	22 of 100 (Routine)
2 May 2020	Rotan, US	daily high min (Tie)	21.7 C (71.1 F)	tie	2 years	1 of 100 (Routine)
29 April 2020	Rotan, US	daily high max	38.3 C (100.9 F)	2.7 C (4.9 F)	42 years	21 of 100 (Routine)
5 April 2020	Rotan, US	daily low max	8.9 C (48.0 F)	0.5 C (0.9 F)	57 years	22 of 100 (Routine)
11 February 2020	Rotan, US	daily rain	23.9 mm (0.9 in)	8.7 mm (0.34 in)	24 years	20 of 100 (Routine)

Climate Trend

42 complete years, 1963 to 2015

One stripe for each of 42 complete years at Rotan, 1963 to 2015. Blue stripes are years cooler than the station's own mean of 18.1 C (64.5 F); red stripes are warmer. The coolest year was 2007, at 17.0 C (62.6 F), and the warmest was 1998, at 19.6 C (67.3 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Rotan as warming stripes, 1963 to 2015
Year	Annual mean temperature	Difference from the station mean
1963	18.9 C	+0.78 C
1964	18.6 C	+0.56 C
1965	18.5 C	+0.47 C
1966	17.5 C	-0.55 C
1967	18.4 C	+0.36 C
1968	17.4 C	-0.65 C
1969	18.0 C	-0.04 C
1970	18.2 C	+0.10 C
1971	18.0 C	-0.12 C
1972	17.9 C	-0.22 C
1973	17.6 C	-0.52 C
1974	18.5 C	+0.40 C
1975	17.6 C	-0.47 C
1976	17.3 C	-0.78 C
1977	18.7 C	+0.63 C
1980	18.7 C	+0.63 C
1981	18.8 C	+0.72 C
1983	17.1 C	-0.96 C
1984	17.6 C	-0.51 C
1986	18.0 C	-0.06 C
1987	17.0 C	-1.04 C
1988	17.6 C	-0.48 C
1995	18.1 C	+0.06 C
1996	18.6 C	+0.49 C
1997	17.2 C	-0.89 C
1998	19.6 C	+1.52 C
1999	18.7 C	+0.63 C
2000	18.1 C	-0.02 C
2001	17.5 C	-0.59 C
2003	18.8 C	+0.72 C
2004	18.3 C	+0.24 C
2005	18.0 C	-0.09 C
2006	18.7 C	+0.61 C
2007	17.0 C	-1.05 C
2008	17.7 C	-0.40 C
2009	17.7 C	-0.36 C
2010	17.5 C	-0.57 C
2011	19.2 C	+1.16 C
2012	19.4 C	+1.33 C
2013	17.5 C	-0.62 C
2014	17.5 C	-0.54 C
2015	18.1 C	+0.00 C

The fitted trend in annual mean temperature here over 1963 to 2015 is 0.00 C (-0.12 to 0.13) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.00 F (-0.22 to 0.23) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Rotan
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.00 C (-0.12 to 0.13) per decade	0.00 F (-0.22 to 0.23) per decade	1963 to 2015	42	Not clearly different from zero
Mean daily maximum	-0.1 C (-0.2 to 0.1) per decade	-0.2 F (-0.4 to 0.1) per decade	1963 to 2015	42	Not clearly different from zero
Mean daily minimum	0.1 C (-0.1 to 0.2) per decade	0.2 F (-0.1 to 0.4) per decade	1963 to 2015	42	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

1924 to 2020

Yearly extremes at Rotan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	46.7 C (116.1 F)	1994	41.1 C (106.0 F)	59
Coldest night (TNn)	-20.6 C (-5.1 F)	1985	-12.2 C (10.0 F)	59
Wettest day (Rx1day)	174.0 mm (6.9 in)	1972	64.8 mm (2.6 in)	96
Wettest five days (Rx5day)	233.2 mm (9.2 in)	1980	92.3 mm (3.6 in)	96
Longest dry spell (CDD)	92 days	1983	42 days	96

Hottest day (TXx)

The hottest day of the year at Rotan, 1924 to 2020. The record is 46.7 C (116.1 F) in 1994, marked on the chart; the median year is 41.1 C (106.0 F).

Hottest day (TXx) at Rotan by year
Year	Hottest day (TXx)
1924	n/a
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	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	42.2 C (108.0 F)
1963	40.0 C (104.0 F)
1964	43.9 C (111.0 F)
1965	40.0 C (104.0 F)
1966	40.6 C (105.1 F)
1967	40.0 C (104.0 F)
1968	38.9 C (102.0 F)
1969	42.2 C (108.0 F)
1970	41.1 C (106.0 F)
1971	41.1 C (106.0 F)
1972	43.3 C (109.9 F)
1973	41.1 C (106.0 F)
1974	42.2 C (108.0 F)
1975	40.6 C (105.1 F)
1976	39.4 C (102.9 F)
1977	40.0 C (104.0 F)
1978	44.4 C (111.9 F)
1979	40.6 C (105.1 F)
1980	43.9 C (111.0 F)
1981	40.0 C (104.0 F)
1982	40.0 C (104.0 F)
1983	41.7 C (107.1 F)
1984	43.3 C (109.9 F)
1985	40.6 C (105.1 F)
1986	42.2 C (108.0 F)
1987	40.6 C (105.1 F)
1988	42.8 C (109.0 F)
1989	44.4 C (111.9 F)
1990	40.6 C (105.1 F)
1991	38.9 C (102.0 F)
1992	38.3 C (100.9 F)
1993	41.1 C (106.0 F)
1994	46.7 C (116.1 F)
1995	42.8 C (109.0 F)
1996	41.1 C (106.0 F)
1997	38.3 C (100.9 F)
1998	42.8 C (109.0 F)
1999	40.0 C (104.0 F)
2000	43.3 C (109.9 F)
2001	40.6 C (105.1 F)
2002	38.9 C (102.0 F)
2003	42.8 C (109.0 F)
2004	39.4 C (102.9 F)
2005	39.4 C (102.9 F)
2006	40.6 C (105.1 F)
2007	37.2 C (99.0 F)
2008	40.6 C (105.1 F)
2009	40.0 C (104.0 F)
2010	40.0 C (104.0 F)
2011	43.3 C (109.9 F)
2012	42.8 C (109.0 F)
2013	41.1 C (106.0 F)
2014	41.1 C (106.0 F)
2015	41.1 C (106.0 F)
2016	40.0 C (104.0 F)
2017	40.0 C (104.0 F)
2018	42.8 C (109.0 F)
2019	42.8 C (109.0 F)
2020	44.4 C (111.9 F)

Coldest night (TNn)

The coldest night of the year at Rotan, 1924 to 2020. The record is -20.6 C (-5.1 F) in 1985, marked on the chart; the median year is -12.2 C (10.0 F).

Coldest night (TNn) at Rotan by year
Year	Coldest night (TNn)
1924	n/a
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	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	-9.4 C (15.1 F)
1963	-15.6 C (3.9 F)
1964	-12.8 C (9.0 F)
1965	-11.1 C (12.0 F)
1966	-16.1 C (3.0 F)
1967	-12.2 C (10.0 F)
1968	-11.7 C (10.9 F)
1969	-8.9 C (16.0 F)
1970	-10.6 C (12.9 F)
1971	-15.6 C (3.9 F)
1972	-13.9 C (7.0 F)
1973	-14.4 C (6.1 F)
1974	-12.2 C (10.0 F)
1975	-11.7 C (10.9 F)
1976	-12.8 C (9.0 F)
1977	-13.9 C (7.0 F)
1978	-12.8 C (9.0 F)
1979	-15.0 C (5.0 F)
1980	-13.9 C (7.0 F)
1981	-13.9 C (7.0 F)
1982	-15.6 C (3.9 F)
1983	-18.3 C (-0.9 F)
1984	-15.0 C (5.0 F)
1985	-20.6 C (-5.1 F)
1986	-10.0 C (14.0 F)
1987	-13.3 C (8.1 F)
1988	-11.1 C (12.0 F)
1989	-20.6 C (-5.1 F)
1990	-15.6 C (3.9 F)
1991	-7.2 C (19.0 F)
1992	-5.6 C (21.9 F)
1993	-9.4 C (15.1 F)
1994	-11.1 C (12.0 F)
1995	-9.4 C (15.1 F)
1996	-15.0 C (5.0 F)
1997	-11.7 C (10.9 F)
1998	-12.8 C (9.0 F)
1999	-8.9 C (16.0 F)
2000	-9.4 C (15.1 F)
2001	-6.7 C (19.9 F)
2002	-11.1 C (12.0 F)
2003	-9.4 C (15.1 F)
2004	-12.2 C (10.0 F)
2005	-14.4 C (6.1 F)
2006	-8.3 C (17.1 F)
2007	-8.9 C (16.0 F)
2008	-8.9 C (16.0 F)
2009	-11.1 C (12.0 F)
2010	-10.0 C (14.0 F)
2011	-13.9 C (7.0 F)
2012	-8.3 C (17.1 F)
2013	-11.7 C (10.9 F)
2014	-12.2 C (10.0 F)
2015	-11.1 C (12.0 F)
2016	-13.3 C (8.1 F)
2017	-11.1 C (12.0 F)
2018	-14.4 C (6.1 F)
2019	-8.3 C (17.1 F)
2020	-12.2 C (10.0 F)

Wettest day (Rx1day)

The wettest day of the year at Rotan, 1924 to 2020. The record is 174.0 mm (6.9 in) in 1972, marked on the chart; the median year is 64.8 mm (2.6 in).

Wettest day (Rx1day) at Rotan by year
Year	Wettest day (Rx1day)
1924	n/a
1925	89.4 mm (3.5 in)
1926	110.5 mm (4.4 in)
1927	24.4 mm (1.0 in)
1928	31.8 mm (1.3 in)
1929	77.0 mm (3.0 in)
1930	36.8 mm (1.4 in)
1931	74.9 mm (2.9 in)
1932	109.2 mm (4.3 in)
1933	43.2 mm (1.7 in)
1934	40.1 mm (1.6 in)
1935	88.9 mm (3.5 in)
1936	66.0 mm (2.6 in)
1937	59.7 mm (2.4 in)
1938	71.1 mm (2.8 in)
1939	58.9 mm (2.3 in)
1940	71.1 mm (2.8 in)
1941	88.9 mm (3.5 in)
1942	47.0 mm (1.9 in)
1943	52.8 mm (2.1 in)
1944	63.5 mm (2.5 in)
1945	74.9 mm (2.9 in)
1946	48.5 mm (1.9 in)
1947	91.4 mm (3.6 in)
1948	60.5 mm (2.4 in)
1949	45.7 mm (1.8 in)
1950	80.5 mm (3.2 in)
1951	66.0 mm (2.6 in)
1952	33.0 mm (1.3 in)
1953	33.3 mm (1.3 in)
1954	64.5 mm (2.5 in)
1955	70.9 mm (2.8 in)
1956	38.6 mm (1.5 in)
1957	44.5 mm (1.8 in)
1958	49.5 mm (1.9 in)
1959	70.4 mm (2.8 in)
1960	81.3 mm (3.2 in)
1961	71.1 mm (2.8 in)
1962	52.1 mm (2.1 in)
1963	82.8 mm (3.3 in)
1964	51.6 mm (2.0 in)
1965	158.8 mm (6.3 in)
1966	94.0 mm (3.7 in)
1967	71.1 mm (2.8 in)
1968	54.1 mm (2.1 in)
1969	61.7 mm (2.4 in)
1970	58.4 mm (2.3 in)
1971	66.0 mm (2.6 in)
1972	174.0 mm (6.9 in)
1973	53.8 mm (2.1 in)
1974	81.3 mm (3.2 in)
1975	60.5 mm (2.4 in)
1976	47.5 mm (1.9 in)
1977	62.5 mm (2.5 in)
1978	66.5 mm (2.6 in)
1979	46.7 mm (1.8 in)
1980	101.6 mm (4.0 in)
1981	64.8 mm (2.6 in)
1982	94.0 mm (3.7 in)
1983	77.5 mm (3.1 in)
1984	63.5 mm (2.5 in)
1985	91.4 mm (3.6 in)
1986	56.9 mm (2.2 in)
1987	53.3 mm (2.1 in)
1988	94.0 mm (3.7 in)
1989	47.0 mm (1.9 in)
1990	87.1 mm (3.4 in)
1991	103.4 mm (4.1 in)
1992	91.9 mm (3.6 in)
1993	61.0 mm (2.4 in)
1994	42.4 mm (1.7 in)
1995	76.2 mm (3.0 in)
1996	86.6 mm (3.4 in)
1997	69.9 mm (2.8 in)
1998	25.4 mm (1.0 in)
1999	36.8 mm (1.4 in)
2000	128.3 mm (5.1 in)
2001	54.6 mm (2.1 in)
2002	40.6 mm (1.6 in)
2003	80.0 mm (3.1 in)
2004	45.7 mm (1.8 in)
2005	163.3 mm (6.4 in)
2006	65.0 mm (2.6 in)
2007	113.5 mm (4.5 in)
2008	58.4 mm (2.3 in)
2009	97.8 mm (3.9 in)
2010	72.4 mm (2.9 in)
2011	66.5 mm (2.6 in)
2012	46.0 mm (1.8 in)
2013	52.1 mm (2.1 in)
2014	37.8 mm (1.5 in)
2015	64.8 mm (2.6 in)
2016	49.5 mm (1.9 in)
2017	61.0 mm (2.4 in)
2018	70.6 mm (2.8 in)
2019	76.2 mm (3.0 in)
2020	35.1 mm (1.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Rotan, 1924 to 2020. The record is 233.2 mm (9.2 in) in 1980, marked on the chart; the median year is 92.3 mm (3.6 in).

Wettest five days (Rx5day) at Rotan by year
Year	Wettest five days (Rx5day)
1924	n/a
1925	96.0 mm (3.8 in)
1926	110.5 mm (4.4 in)
1927	30.2 mm (1.2 in)
1928	67.9 mm (2.7 in)
1929	86.0 mm (3.4 in)
1930	65.0 mm (2.6 in)
1931	94.0 mm (3.7 in)
1932	156.2 mm (6.1 in)
1933	57.7 mm (2.3 in)
1934	45.7 mm (1.8 in)
1935	127.0 mm (5.0 in)
1936	91.7 mm (3.6 in)
1937	59.7 mm (2.4 in)
1938	75.2 mm (3.0 in)
1939	84.3 mm (3.3 in)
1940	89.2 mm (3.5 in)
1941	115.0 mm (4.5 in)
1942	47.0 mm (1.9 in)
1943	52.8 mm (2.1 in)
1944	78.2 mm (3.1 in)
1945	98.2 mm (3.9 in)
1946	69.6 mm (2.7 in)
1947	144.7 mm (5.7 in)
1948	92.9 mm (3.7 in)
1949	72.9 mm (2.9 in)
1950	83.5 mm (3.3 in)
1951	86.1 mm (3.4 in)
1952	36.8 mm (1.4 in)
1953	59.7 mm (2.4 in)
1954	88.9 mm (3.5 in)
1955	101.1 mm (4.0 in)
1956	43.7 mm (1.7 in)
1957	110.5 mm (4.4 in)
1958	76.2 mm (3.0 in)
1959	121.5 mm (4.8 in)
1960	101.1 mm (4.0 in)
1961	71.1 mm (2.8 in)
1962	107.5 mm (4.2 in)
1963	84.1 mm (3.3 in)
1964	99.1 mm (3.9 in)
1965	174.3 mm (6.9 in)
1966	131.1 mm (5.2 in)
1967	73.1 mm (2.9 in)
1968	83.8 mm (3.3 in)
1969	103.9 mm (4.1 in)
1970	74.7 mm (2.9 in)
1971	116.8 mm (4.6 in)
1972	208.3 mm (8.2 in)
1973	109.2 mm (4.3 in)
1974	132.2 mm (5.2 in)
1975	85.4 mm (3.4 in)
1976	84.3 mm (3.3 in)
1977	104.1 mm (4.1 in)
1978	79.7 mm (3.1 in)
1979	74.4 mm (2.9 in)
1980	233.2 mm (9.2 in)
1981	100.9 mm (4.0 in)
1982	183.9 mm (7.2 in)
1983	157.0 mm (6.2 in)
1984	78.8 mm (3.1 in)
1985	95.2 mm (3.7 in)
1986	141.5 mm (5.6 in)
1987	65.5 mm (2.6 in)
1988	102.9 mm (4.1 in)
1989	96.0 mm (3.8 in)
1990	132.8 mm (5.2 in)
1991	147.8 mm (5.8 in)
1992	97.0 mm (3.8 in)
1993	101.6 mm (4.0 in)
1994	64.8 mm (2.6 in)
1995	124.2 mm (4.9 in)
1996	130.3 mm (5.1 in)
1997	104.2 mm (4.1 in)
1998	35.3 mm (1.4 in)
1999	70.6 mm (2.8 in)
2000	129.6 mm (5.1 in)
2001	68.3 mm (2.7 in)
2002	94.5 mm (3.7 in)
2003	110.5 mm (4.4 in)
2004	91.0 mm (3.6 in)
2005	34.8 mm (1.4 in)
2006	91.7 mm (3.6 in)
2007	130.5 mm (5.1 in)
2008	72.9 mm (2.9 in)
2009	146.6 mm (5.8 in)
2010	109.2 mm (4.3 in)
2011	68.0 mm (2.7 in)
2012	67.8 mm (2.7 in)
2013	72.7 mm (2.9 in)
2014	73.4 mm (2.9 in)
2015	72.9 mm (2.9 in)
2016	102.0 mm (4.0 in)
2017	104.9 mm (4.1 in)
2018	114.0 mm (4.5 in)
2019	96.5 mm (3.8 in)
2020	55.9 mm (2.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Rotan, 1924 to 2020. The record is 92 days in 1983, marked on the chart; the median year is 42 days.

Longest dry spell (CDD) at Rotan by year
Year	Longest dry spell (CDD)
1924	n/a
1925	55 days
1926	37 days
1927	81 days
1928	34 days
1929	27 days
1930	61 days
1931	55 days
1932	55 days
1933	56 days
1934	67 days
1935	36 days
1936	39 days
1937	36 days
1938	47 days
1939	52 days
1940	43 days
1941	27 days
1942	56 days
1943	77 days
1944	34 days
1945	25 days
1946	38 days
1947	30 days
1948	44 days
1949	45 days
1950	89 days
1951	46 days
1952	42 days
1953	44 days
1954	41 days
1955	41 days
1956	55 days
1957	28 days
1958	34 days
1959	40 days
1960	39 days
1961	23 days
1962	47 days
1963	42 days
1964	33 days
1965	22 days
1966	35 days
1967	41 days
1968	20 days
1969	45 days
1970	50 days
1971	53 days
1972	47 days
1973	37 days
1974	59 days
1975	33 days
1976	66 days
1977	50 days
1978	36 days
1979	48 days
1980	47 days
1981	29 days
1982	23 days
1983	92 days
1984	63 days
1985	35 days
1986	72 days
1987	90 days
1988	68 days
1989	58 days
1990	32 days
1991	43 days
1992	58 days
1993	40 days
1994	46 days
1995	35 days
1996	50 days
1997	33 days
1998	55 days
1999	61 days
2000	81 days
2001	46 days
2002	39 days
2003	39 days
2004	31 days
2005	42 days
2006	35 days
2007	56 days
2008	77 days
2009	32 days
2010	35 days
2011	47 days
2012	31 days
2013	29 days
2014	19 days
2015	25 days
2016	27 days
2017	50 days
2018	35 days
2019	39 days
2020	28 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

42 years with a frost

Across 42 years with a frost, the median last spring frost at Rotan falls on 28 March and the median first autumn frost on 13 November, which leaves a median of 229 days between them.

Fitted over all years, the growing season changes by +2.0 days per decade at this station.

Frost dates and growing season at Rotan
Measure	Median, all years	Earliest period	Recent period (1975 to 2015)	Recent against earliest	Fitted trend
Last spring frost	28 March	n/a	26 March	n/a	-1.1 days per decade
First autumn frost	13 November	n/a	13 November	n/a	+0.9 days per decade
Growing days	229 days	n/a	230 days	n/a	+2.0 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

81 years, 1926 to 2018

A day with at least 64.7 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 147.8 mm (5.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Rotan: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	64.7 mm (2.5 in)
5 years	87.3 mm (3.4 in)
10 years	102.1 mm (4.0 in)
25 years	120.6 mm (4.7 in)
50 years	134.3 mm (5.3 in)
100 years	147.8 mm (5.8 in)	Longer than the 81 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, 81 years of values from 1926 to 2018.

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: 174.0 mm (6.9 in) in 1972; 158.8 mm (6.3 in) in 1965; 128.3 mm (5.1 in) in 2000.

Station Changes

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

Download the Data

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