Sparta Wwtp Weather Records (USC00408522)

Record envelope, standing records and threshold days for Sparta Wwtp (USC00408522), Tennessee, United States, with 87 years of record.

Key Facts for Sparta Wwtp

Sparta Wwtp (USC00408522) is a weather station in Tennessee, United States at 35.91 latitude and -85.47 longitude, 276 m (905 ft) above sea level.
The station reports from 1940 to 2026, 87 years of record.
1,464 records set at Sparta Wwtp still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Sparta Wwtp tied a monthly record low minimum temperature of -1.7 C (28.9 F) on 29 September 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: Tennessee, United States, 35.91 latitude, -85.47 longitude.
Elevation: 276 m (905 ft).
Period of record: 1940 to 2026, 87 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

15 days at or beyond a record

The band shows the record high and record low for each calendar day at Sparta Wwtp. The lines show the 2026 daily maximum and minimum. 15 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Sparta Wwtp, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	25.0 C (77.0 F)	-26.1 C (-15.0 F)	18.9 C (66.0 F)	-14.4 C (6.1 F)
Feb	27.2 C (81.0 F)	-28.9 C (-20.0 F)	22.2 C (72.0 F)	-15.6 C (3.9 F)
Mar	31.1 C (88.0 F)	-14.4 C (6.1 F)	28.9 C (84.0 F)	-3.3 C (26.1 F)
Apr	32.8 C (91.0 F)	-6.1 C (21.0 F)	28.9 C (84.0 F)	1.7 C (35.1 F)
May	34.4 C (93.9 F)	-2.2 C (28.0 F)	31.7 C (89.1 F)	3.9 C (39.0 F)
Jun	42.2 C (108.0 F)	1.1 C (34.0 F)	33.3 C (91.9 F)	10.6 C (51.1 F)
Jul	41.1 C (106.0 F)	8.3 C (46.9 F)	35.0 C (95.0 F)	15.0 C (59.0 F)
Aug	39.4 C (102.9 F)	7.8 C (46.0 F)	35.0 C (95.0 F)	13.9 C (57.0 F)
Sep	37.8 C (100.0 F)	-1.7 C (28.9 F)	36.7 C (98.1 F)	-1.7 C (28.9 F)
Oct	35.6 C (96.1 F)	-7.2 C (19.0 F)	32.2 C (90.0 F)	2.8 C (37.0 F)
Nov	32.8 C (91.0 F)	-13.9 C (7.0 F)	n/a	n/a
Dec	25.6 C (78.1 F)	-26.7 C (-16.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Sparta Wwtp still stand. 1963 holds the most, with 46.

Standing records at Sparta Wwtp by the year they were set
Year set	Standing records
1961	34
1962	37
1963	46
1964	29
1965	18
1966	33
1967	44
1968	24
1969	31
1970	22
1971	20
1972	23
1973	22
1974	32
1975	11
1976	32
1977	31
1978	15
1979	23
1980	22
1981	6
1982	4
1983	26
1984	9
1985	19
1986	27
1987	16
1988	34
1989	33
1990	27
1991	22
1992	15
1993	19
1994	7
1995	13
1996	29
1997	20
1998	30
1999	23
2000	14
2001	13
2002	30
2003	18
2004	27
2005	9
2006	17
2007	32
2008	8
2009	8
2010	25
2011	21
2012	34
2013	19
2014	23
2015	34
2016	24
2017	25
2018	25
2019	24
2020	21
2021	6
2022	19
2023	19
2024	18
2025	15
2026	8

All-Time Record Progression

3 new records

3 all-time records were set at Sparta Wwtp between 5 February 1996 and 24 December 2022. Each dot is a new record.

When Sparta Wwtp set new all-time records
Date	Kind	Detail
1996-02-05	Record low minimum temperature	Record low minimum temperature -28.9 C (-20.0 F)
2012-06-30	Record high maximum temperature	Record high maximum temperature 42.2 C (108.0 F)
2022-12-24	Record low maximum temperature	Record low maximum temperature -15.6 C (3.9 F)

Wettest Day of Each Month

Jul: 154.9 mm (6.1 in)

The wettest day on record for each calendar month at Sparta Wwtp. The most was 154.9 mm (6.1 in) on 24 July 1957.

Record daily precipitation for each month at Sparta Wwtp
Month	Record daily precipitation (mm)	Date
Jan	105.4 mm (4.1 in)	23 January 2002
Feb	104.6 mm (4.1 in)	18 February 1956
Mar	117.6 mm (4.6 in)	12 March 1963
Apr	81.3 mm (3.2 in)	8 April 2006
May	87.6 mm (3.4 in)	5 May 2003
Jun	116.3 mm (4.6 in)	28 June 2018
Jul	154.9 mm (6.1 in)	24 July 1957
Aug	91.4 mm (3.6 in)	12 August 1970
Sep	118.1 mm (4.6 in)	29 September 1964
Oct	102.9 mm (4.1 in)	3 October 1962
Nov	117.1 mm (4.6 in)	7 November 2017
Dec	119.4 mm (4.7 in)	30 December 1969

Period of Record Coverage

1961 to 2026

66 years of record at Sparta Wwtp, 1961 to 2026. 12 years have data for under 90 percent of days and are left out of rankings: 1961, 1971, 1980, 1982, 1983, 1984, 1985, 1994 and others.

Days with data per year at Sparta Wwtp
Year	Days with data	Share of year	Complete
1961	317	87%	No
1962	350	96%	Yes
1963	345	95%	Yes
1964	340	93%	Yes
1965	342	94%	Yes
1966	339	93%	Yes
1967	353	97%	Yes
1968	355	97%	Yes
1969	342	94%	Yes
1970	342	94%	Yes
1971	328	90%	No
1972	338	92%	Yes
1973	361	99%	Yes
1974	331	91%	Yes
1975	356	98%	Yes
1976	364	99%	Yes
1977	364	100%	Yes
1978	365	100%	Yes
1979	333	91%	Yes
1980	322	88%	No
1981	343	94%	Yes
1982	77	21%	No
1983	234	64%	No
1984	181	49%	No
1985	293	80%	No
1986	350	96%	Yes
1987	360	99%	Yes
1988	358	98%	Yes
1989	365	100%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	361	99%	Yes
1993	361	99%	Yes
1994	278	76%	No
1995	360	99%	Yes
1996	358	98%	Yes
1997	363	99%	Yes
1998	365	100%	Yes
1999	363	99%	Yes
2000	361	99%	Yes
2001	363	99%	Yes
2002	360	99%	Yes
2003	364	100%	Yes
2004	365	100%	Yes
2005	362	99%	Yes
2006	365	100%	Yes
2007	363	99%	Yes
2008	319	87%	No
2009	335	92%	Yes
2010	326	89%	No
2011	321	88%	No
2012	366	100%	Yes
2013	365	100%	Yes
2014	365	100%	Yes
2015	365	100%	Yes
2016	366	100%	Yes
2017	365	100%	Yes
2018	365	100%	Yes
2019	365	100%	Yes
2020	366	100%	Yes
2021	365	100%	Yes
2022	365	100%	Yes
2023	362	99%	Yes
2024	354	97%	Yes
2025	364	100%	Yes
2026	283	78%	No

Latest Records

Latest records at Sparta Wwtp
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
29 September 2026	Sparta Wwtp, US	monthly low min (Tie, Provisional)	-1.7 C (28.9 F)	tie	58 years	8 of 100 (Routine)
28 September 2026	Sparta Wwtp, US	daily low min (Provisional)	0.0 C (32.0 F)	2.8 C (5.0 F)	4 years	13 of 100 (Routine)
27 September 2026	Sparta Wwtp, US	daily low min (Provisional)	2.8 C (37.0 F)	0.5 C (0.9 F)	51 years	22 of 100 (Routine)
22 September 2026	Sparta Wwtp, US	daily high max (Provisional)	34.4 C (93.9 F)	0.5 C (0.9 F)	4 years	8 of 100 (Routine)
21 September 2026	Sparta Wwtp, US	daily high max (Tie, Provisional)	33.3 C (91.9 F)	tie	48 years	5 of 100 (Routine)
16 September 2026	Sparta Wwtp, US	daily high max (Provisional)	35.0 C (95.0 F)	1.1 C (2.0 F)	35 years	18 of 100 (Routine)
12 September 2026	Sparta Wwtp, US	daily high max (Provisional)	34.4 C (93.9 F)	0.5 C (0.9 F)	61 years	25 of 100 (Routine)
12 September 2026	Sparta Wwtp, US	daily high min (Tie, Provisional)	20.6 C (69.1 F)	tie	37 years	4 of 100 (Routine)
8 September 2026	Sparta Wwtp, US	daily high max (Tie, Provisional)	35.6 C (96.1 F)	tie	27 years	3 of 100 (Routine)
5 September 2026	Sparta Wwtp, US	daily high max (Provisional)	35.6 C (96.1 F)	1.2 C (2.2 F)	52 years	24 of 100 (Routine)
21 August 2026	Sparta Wwtp, US	daily rain (Provisional)	22.9 mm (0.9 in)	2.1 mm (0.08 in)	44 years	20 of 100 (Routine)
27 July 2026	Sparta Wwtp, US	daily high min (Tie)	22.8 C (73.0 F)	tie	33 years	4 of 100 (Routine)
28 June 2026	Sparta Wwtp, US	daily high min	22.8 C (73.0 F)	1.1 C (2.0 F)	27 years	17 of 100 (Routine)
22 May 2026	Sparta Wwtp, US	daily rain	29.2 mm (1.1 in)	6.8 mm (0.27 in)	24 years	19 of 100 (Routine)
13 April 2026	Sparta Wwtp, US	daily high max (Tie)	28.9 C (84.0 F)	tie	48 years	5 of 100 (Routine)
23 March 2026	Sparta Wwtp, US	daily high max	28.9 C (84.0 F)	1.1 C (2.0 F)	60 years	25 of 100 (Routine)
22 March 2026	Sparta Wwtp, US	daily high max	28.9 C (84.0 F)	1.1 C (2.0 F)	37 years	18 of 100 (Routine)
18 March 2026	Sparta Wwtp, US	daily low max (Tie)	3.3 C (37.9 F)	tie	59 years	5 of 100 (Routine)
17 March 2026	Sparta Wwtp, US	daily low max	1.7 C (35.1 F)	5.5 C (9.9 F)	49 years	28 of 100 (Routine)
8 March 2026	Sparta Wwtp, US	daily high max	27.8 C (82.0 F)	1.1 C (2.0 F)	25 years	14 of 100 (Routine)

Climate Trend

50 complete years, 1962 to 2025

One stripe for each of 50 complete years at Sparta Wwtp, 1962 to 2025. Blue stripes are years cooler than the station's own mean of 14.5 C (58.1 F); red stripes are warmer. The coolest year was 1976, at 12.5 C (54.5 F), and the warmest was 2007, at 16.0 C (60.9 F). The strongest colour marks a difference of 2.1 C (3.8 F).

Annual mean temperature at Sparta Wwtp as warming stripes, 1962 to 2025
Year	Annual mean temperature	Difference from the station mean
1962	13.8 C	-0.73 C
1964	13.6 C	-0.93 C
1965	13.6 C	-0.87 C
1966	12.9 C	-1.56 C
1967	13.2 C	-1.30 C
1968	12.7 C	-1.75 C
1969	12.9 C	-1.61 C
1970	13.5 C	-1.01 C
1971	13.7 C	-0.78 C
1973	14.4 C	-0.12 C
1975	14.1 C	-0.35 C
1976	12.5 C	-2.01 C
1977	13.7 C	-0.75 C
1978	13.1 C	-1.43 C
1981	13.6 C	-0.92 C
1986	15.6 C	+1.09 C
1987	15.2 C	+0.70 C
1988	14.4 C	-0.11 C
1989	14.2 C	-0.25 C
1990	15.8 C	+1.29 C
1991	15.6 C	+1.09 C
1992	14.4 C	-0.11 C
1993	14.5 C	+0.03 C
1995	14.4 C	-0.10 C
1996	14.2 C	-0.28 C
1997	14.2 C	-0.25 C
1998	15.9 C	+1.42 C
1999	15.5 C	+1.02 C
2000	14.7 C	+0.25 C
2001	14.9 C	+0.41 C
2002	15.4 C	+0.93 C
2003	15.1 C	+0.63 C
2004	16.0 C	+1.49 C
2005	15.4 C	+0.86 C
2006	15.5 C	+0.99 C
2007	16.0 C	+1.54 C
2008	14.7 C	+0.20 C
2012	15.6 C	+1.11 C
2013	13.8 C	-0.69 C
2014	13.5 C	-0.97 C
2015	14.9 C	+0.45 C
2016	15.5 C	+1.02 C
2017	15.4 C	+0.89 C
2018	15.0 C	+0.53 C
2019	15.4 C	+0.89 C
2020	15.1 C	+0.62 C
2021	14.7 C	+0.17 C
2022	14.1 C	-0.39 C
2023	14.4 C	-0.09 C
2025	14.4 C	-0.08 C

The annual mean temperature here has risen by 0.3 C (0.2 to 0.4) per decade over 1962 to 2025. In Fahrenheit: 0.5 F (0.3 to 0.7) per decade. The slope is a straight line fitted to 50 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Sparta Wwtp
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.3 C (0.2 to 0.4) per decade	0.5 F (0.3 to 0.7) per decade	1962 to 2025	50	Rise
Mean daily maximum	0.16 C (0.04 to 0.28) per decade	0.3 F (0.1 to 0.5) per decade	1962 to 2025	50	Rise
Mean daily minimum	0.4 C (0.3 to 0.6) per decade	0.8 F (0.5 to 1.0) per decade	1962 to 2025	50	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

1940 to 2026

Yearly extremes at Sparta Wwtp: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.2 C (108.0 F)	2012	35.6 C (96.1 F)	66
Coldest night (TNn)	-28.9 C (-20.0 F)	1996	-15.6 C (3.9 F)	66
Wettest day (Rx1day)	154.9 mm (6.1 in)	1957	71.1 mm (2.8 in)	87
Wettest five days (Rx5day)	261.4 mm (10.3 in)	1990	124.0 mm (4.9 in)	87
Longest dry spell (CDD)	36 days	1953	19 days	87

Hottest day (TXx)

The hottest day of the year at Sparta Wwtp, 1940 to 2026. The record is 42.2 C (108.0 F) in 2012, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at Sparta Wwtp 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	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	33.3 C (91.9 F)
1962	35.6 C (96.1 F)
1963	34.4 C (93.9 F)
1964	35.6 C (96.1 F)
1965	34.4 C (93.9 F)
1966	36.7 C (98.1 F)
1967	32.8 C (91.0 F)
1968	37.2 C (99.0 F)
1969	35.6 C (96.1 F)
1970	35.6 C (96.1 F)
1971	36.1 C (97.0 F)
1972	33.9 C (93.0 F)
1973	36.1 C (97.0 F)
1974	35.0 C (95.0 F)
1975	35.0 C (95.0 F)
1976	34.4 C (93.9 F)
1977	36.7 C (98.1 F)
1978	35.6 C (96.1 F)
1979	35.0 C (95.0 F)
1980	40.0 C (104.0 F)
1981	35.0 C (95.0 F)
1982	30.0 C (86.0 F)
1983	39.4 C (102.9 F)
1984	33.9 C (93.0 F)
1985	35.0 C (95.0 F)
1986	36.7 C (98.1 F)
1987	36.7 C (98.1 F)
1988	39.4 C (102.9 F)
1989	33.9 C (93.0 F)
1990	37.8 C (100.0 F)
1991	35.0 C (95.0 F)
1992	34.4 C (93.9 F)
1993	36.7 C (98.1 F)
1994	33.3 C (91.9 F)
1995	35.6 C (96.1 F)
1996	34.4 C (93.9 F)
1997	36.7 C (98.1 F)
1998	35.6 C (96.1 F)
1999	37.2 C (99.0 F)
2000	35.6 C (96.1 F)
2001	36.1 C (97.0 F)
2002	36.1 C (97.0 F)
2003	33.3 C (91.9 F)
2004	33.9 C (93.0 F)
2005	39.4 C (102.9 F)
2006	36.1 C (97.0 F)
2007	39.4 C (102.9 F)
2008	35.0 C (95.0 F)
2009	35.0 C (95.0 F)
2010	37.8 C (100.0 F)
2011	37.2 C (99.0 F)
2012	42.2 C (108.0 F)
2013	33.9 C (93.0 F)
2014	33.3 C (91.9 F)
2015	33.9 C (93.0 F)
2016	35.0 C (95.0 F)
2017	35.0 C (95.0 F)
2018	35.0 C (95.0 F)
2019	36.1 C (97.0 F)
2020	35.0 C (95.0 F)
2021	35.0 C (95.0 F)
2022	35.6 C (96.1 F)
2023	35.0 C (95.0 F)
2024	36.7 C (98.1 F)
2025	34.4 C (93.9 F)
2026	36.7 C (98.1 F)

Coldest night (TNn)

The coldest night of the year at Sparta Wwtp, 1940 to 2026. The record is -28.9 C (-20.0 F) in 1996, marked on the chart; the median year is -15.6 C (3.9 F).

Coldest night (TNn) at Sparta Wwtp by year
Year	Coldest night (TNn)
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	-13.9 C (7.0 F)
1962	-26.7 C (-16.1 F)
1963	-26.1 C (-15.0 F)
1964	-15.6 C (3.9 F)
1965	-22.8 C (-9.0 F)
1966	-25.6 C (-14.1 F)
1967	-18.9 C (-2.0 F)
1968	-15.6 C (3.9 F)
1969	-18.9 C (-2.0 F)
1970	-22.2 C (-8.0 F)
1971	-20.6 C (-5.1 F)
1972	-18.9 C (-2.0 F)
1973	-18.9 C (-2.0 F)
1974	-12.2 C (10.0 F)
1975	-15.0 C (5.0 F)
1976	-18.3 C (-0.9 F)
1977	-23.3 C (-9.9 F)
1978	-17.8 C (0.0 F)
1979	-21.7 C (-7.1 F)
1980	-11.7 C (10.9 F)
1981	-17.8 C (0.0 F)
1982	-20.6 C (-5.1 F)
1983	-21.1 C (-6.0 F)
1984	-18.9 C (-2.0 F)
1985	-13.9 C (7.0 F)
1986	-17.2 C (1.0 F)
1987	-13.9 C (7.0 F)
1988	-16.7 C (1.9 F)
1989	-21.1 C (-6.0 F)
1990	-11.1 C (12.0 F)
1991	-13.9 C (7.0 F)
1992	-13.9 C (7.0 F)
1993	-14.4 C (6.1 F)
1994	-22.2 C (-8.0 F)
1995	-15.6 C (3.9 F)
1996	-28.9 C (-20.0 F)
1997	-16.1 C (3.0 F)
1998	-11.7 C (10.9 F)
1999	-11.1 C (12.0 F)
2000	-15.0 C (5.0 F)
2001	-15.0 C (5.0 F)
2002	-12.8 C (9.0 F)
2003	-19.4 C (-2.9 F)
2004	-12.8 C (9.0 F)
2005	-12.2 C (10.0 F)
2006	-12.2 C (10.0 F)
2007	-12.2 C (10.0 F)
2008	-13.3 C (8.1 F)
2009	-15.6 C (3.9 F)
2010	-12.8 C (9.0 F)
2011	-13.3 C (8.1 F)
2012	-10.0 C (14.0 F)
2013	-9.4 C (15.1 F)
2014	-20.0 C (-4.0 F)
2015	-18.9 C (-2.0 F)
2016	-13.3 C (8.1 F)
2017	-15.6 C (3.9 F)
2018	-18.3 C (-0.9 F)
2019	-10.6 C (12.9 F)
2020	-11.1 C (12.0 F)
2021	-10.6 C (12.9 F)
2022	-18.9 C (-2.0 F)
2023	-13.9 C (7.0 F)
2024	-21.1 C (-6.0 F)
2025	-17.8 C (0.0 F)
2026	-15.6 C (3.9 F)

Wettest day (Rx1day)

The wettest day of the year at Sparta Wwtp, 1940 to 2026. The record is 154.9 mm (6.1 in) in 1957, marked on the chart; the median year is 71.1 mm (2.8 in).

Wettest day (Rx1day) at Sparta Wwtp by year
Year	Wettest day (Rx1day)
1940	54.6 mm (2.1 in)
1941	54.9 mm (2.2 in)
1942	55.4 mm (2.2 in)
1943	31.8 mm (1.3 in)
1944	19.1 mm (0.8 in)
1945	59.7 mm (2.4 in)
1946	62.5 mm (2.5 in)
1947	37.6 mm (1.5 in)
1948	99.1 mm (3.9 in)
1949	101.6 mm (4.0 in)
1950	48.3 mm (1.9 in)
1951	78.7 mm (3.1 in)
1952	71.1 mm (2.8 in)
1953	81.3 mm (3.2 in)
1954	99.1 mm (3.9 in)
1955	53.3 mm (2.1 in)
1956	104.6 mm (4.1 in)
1957	154.9 mm (6.1 in)
1958	68.6 mm (2.7 in)
1959	66.0 mm (2.6 in)
1960	68.6 mm (2.7 in)
1961	109.0 mm (4.3 in)
1962	102.9 mm (4.1 in)
1963	117.6 mm (4.6 in)
1964	118.1 mm (4.6 in)
1965	88.4 mm (3.5 in)
1966	47.2 mm (1.9 in)
1967	61.0 mm (2.4 in)
1968	62.0 mm (2.4 in)
1969	119.4 mm (4.7 in)
1970	91.4 mm (3.6 in)
1971	71.1 mm (2.8 in)
1972	84.8 mm (3.3 in)
1973	96.0 mm (3.8 in)
1974	88.1 mm (3.5 in)
1975	109.2 mm (4.3 in)
1976	58.4 mm (2.3 in)
1977	63.5 mm (2.5 in)
1978	77.0 mm (3.0 in)
1979	92.5 mm (3.6 in)
1980	65.3 mm (2.6 in)
1981	62.2 mm (2.4 in)
1982	38.1 mm (1.5 in)
1983	65.0 mm (2.6 in)
1984	83.8 mm (3.3 in)
1985	54.4 mm (2.1 in)
1986	58.4 mm (2.3 in)
1987	69.1 mm (2.7 in)
1988	57.9 mm (2.3 in)
1989	57.2 mm (2.3 in)
1990	98.3 mm (3.9 in)
1991	87.4 mm (3.4 in)
1992	63.5 mm (2.5 in)
1993	114.3 mm (4.5 in)
1994	85.1 mm (3.4 in)
1995	85.9 mm (3.4 in)
1996	63.5 mm (2.5 in)
1997	76.2 mm (3.0 in)
1998	92.7 mm (3.6 in)
1999	66.5 mm (2.6 in)
2000	53.3 mm (2.1 in)
2001	58.4 mm (2.3 in)
2002	105.4 mm (4.1 in)
2003	87.6 mm (3.4 in)
2004	66.3 mm (2.6 in)
2005	44.5 mm (1.8 in)
2006	81.3 mm (3.2 in)
2007	44.5 mm (1.8 in)
2008	55.9 mm (2.2 in)
2009	63.5 mm (2.5 in)
2010	73.2 mm (2.9 in)
2011	91.2 mm (3.6 in)
2012	115.6 mm (4.6 in)
2013	80.0 mm (3.1 in)
2014	66.5 mm (2.6 in)
2015	76.2 mm (3.0 in)
2016	83.1 mm (3.3 in)
2017	117.1 mm (4.6 in)
2018	116.3 mm (4.6 in)
2019	50.5 mm (2.0 in)
2020	88.6 mm (3.5 in)
2021	103.9 mm (4.1 in)
2022	77.2 mm (3.0 in)
2023	68.6 mm (2.7 in)
2024	67.3 mm (2.6 in)
2025	68.3 mm (2.7 in)
2026	35.1 mm (1.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Sparta Wwtp, 1940 to 2026. The record is 261.4 mm (10.3 in) in 1990, marked on the chart; the median year is 124.0 mm (4.9 in).

Wettest five days (Rx5day) at Sparta Wwtp by year
Year	Wettest five days (Rx5day)
1940	77.0 mm (3.0 in)
1941	89.4 mm (3.5 in)
1942	108.0 mm (4.3 in)
1943	52.3 mm (2.1 in)
1944	45.3 mm (1.8 in)
1945	90.7 mm (3.6 in)
1946	120.4 mm (4.7 in)
1947	68.9 mm (2.7 in)
1948	158.3 mm (6.2 in)
1949	163.1 mm (6.4 in)
1950	166.9 mm (6.6 in)
1951	101.6 mm (4.0 in)
1952	86.9 mm (3.4 in)
1953	100.9 mm (4.0 in)
1954	147.4 mm (5.8 in)
1955	146.5 mm (5.8 in)
1956	142.5 mm (5.6 in)
1957	166.8 mm (6.6 in)
1958	102.9 mm (4.1 in)
1959	97.8 mm (3.9 in)
1960	94.8 mm (3.7 in)
1961	113.3 mm (4.5 in)
1962	127.9 mm (5.0 in)
1963	146.3 mm (5.8 in)
1964	152.5 mm (6.0 in)
1965	154.7 mm (6.1 in)
1966	122.2 mm (4.8 in)
1967	131.6 mm (5.2 in)
1968	81.4 mm (3.2 in)
1969	92.3 mm (3.6 in)
1970	155.2 mm (6.1 in)
1971	139.7 mm (5.5 in)
1972	90.4 mm (3.6 in)
1973	189.6 mm (7.5 in)
1974	145.0 mm (5.7 in)
1975	237.6 mm (9.4 in)
1976	85.3 mm (3.4 in)
1977	133.2 mm (5.2 in)
1978	107.5 mm (4.2 in)
1979	122.7 mm (4.8 in)
1980	82.3 mm (3.2 in)
1981	81.6 mm (3.2 in)
1982	76.8 mm (3.0 in)
1983	128.5 mm (5.1 in)
1984	176.5 mm (6.9 in)
1985	127.5 mm (5.0 in)
1986	123.9 mm (4.9 in)
1987	90.2 mm (3.6 in)
1988	104.1 mm (4.1 in)
1989	107.0 mm (4.2 in)
1990	261.4 mm (10.3 in)
1991	209.0 mm (8.2 in)
1992	111.3 mm (4.4 in)
1993	125.3 mm (4.9 in)
1994	192.0 mm (7.6 in)
1995	114.1 mm (4.5 in)
1996	114.3 mm (4.5 in)
1997	150.3 mm (5.9 in)
1998	147.3 mm (5.8 in)
1999	170.7 mm (6.7 in)
2000	145.6 mm (5.7 in)
2001	112.8 mm (4.4 in)
2002	171.5 mm (6.8 in)
2003	233.1 mm (9.2 in)
2004	141.8 mm (5.6 in)
2005	78.5 mm (3.1 in)
2006	109.8 mm (4.3 in)
2007	72.4 mm (2.9 in)
2008	63.3 mm (2.5 in)
2009	147.6 mm (5.8 in)
2010	124.0 mm (4.9 in)
2011	149.1 mm (5.9 in)
2012	121.5 mm (4.8 in)
2013	147.1 mm (5.8 in)
2014	122.4 mm (4.8 in)
2015	146.5 mm (5.8 in)
2016	107.7 mm (4.2 in)
2017	139.6 mm (5.5 in)
2018	169.9 mm (6.7 in)
2019	174.6 mm (6.9 in)
2020	125.2 mm (4.9 in)
2021	149.6 mm (5.9 in)
2022	161.0 mm (6.3 in)
2023	96.3 mm (3.8 in)
2024	131.6 mm (5.2 in)
2025	123.2 mm (4.9 in)
2026	96.0 mm (3.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Sparta Wwtp, 1940 to 2026. The record is 36 days in 1953, marked on the chart; the median year is 19 days.

Longest dry spell (CDD) at Sparta Wwtp by year
Year	Longest dry spell (CDD)
1940	14 days
1941	19 days
1942	20 days
1943	22 days
1944	11 days
1945	20 days
1946	17 days
1947	15 days
1948	19 days
1949	18 days
1950	16 days
1951	16 days
1952	30 days
1953	36 days
1954	27 days
1955	26 days
1956	25 days
1957	24 days
1958	30 days
1959	25 days
1960	16 days
1961	16 days
1962	18 days
1963	33 days
1964	22 days
1965	25 days
1966	20 days
1967	17 days
1968	26 days
1969	18 days
1970	20 days
1971	20 days
1972	22 days
1973	14 days
1974	19 days
1975	13 days
1976	17 days
1977	19 days
1978	15 days
1979	19 days
1980	18 days
1981	15 days
1982	13 days
1983	15 days
1984	13 days
1985	13 days
1986	18 days
1987	23 days
1988	29 days
1989	13 days
1990	23 days
1991	18 days
1992	14 days
1993	17 days
1994	13 days
1995	11 days
1996	14 days
1997	19 days
1998	22 days
1999	26 days
2000	21 days
2001	25 days
2002	18 days
2003	11 days
2004	10 days
2005	29 days
2006	14 days
2007	27 days
2008	26 days
2009	30 days
2010	29 days
2011	14 days
2012	23 days
2013	19 days
2014	20 days
2015	16 days
2016	31 days
2017	13 days
2018	19 days
2019	16 days
2020	11 days
2021	16 days
2022	30 days
2023	13 days
2024	22 days
2025	13 days
2026	15 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

50 years with a frost

Across 50 years with a frost, the median last spring frost at Sparta Wwtp falls on 16 April and the median first autumn frost on 21 October, which leaves a median of 188 days between them.

Fitted over all years, the growing season changes by +4.4 days per decade at this station.

Frost dates and growing season at Sparta Wwtp
Measure	Median, all years	Earliest period	Recent period (1991 to 2025)	Recent against earliest	Fitted trend
Last spring frost	16 April	n/a	14 April	n/a	-1.5 days per decade
First autumn frost	21 October	n/a	23 October	n/a	+2.9 days per decade
Growing days	188 days	n/a	191 days	n/a	+4.4 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

70 years, 1947 to 2025

A day with at least 76.7 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 148.4 mm (5.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Sparta Wwtp: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	76.7 mm (3.0 in)
5 years	98.0 mm (3.9 in)
10 years	111.2 mm (4.4 in)
25 years	127.0 mm (5.0 in)
50 years	138.0 mm (5.4 in)
100 years	148.4 mm (5.8 in)	Longer than the 70 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, 70 years of values from 1947 to 2025.

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: 154.9 mm (6.1 in) in 1957; 119.4 mm (4.7 in) in 1969; 118.1 mm (4.6 in) in 1964.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Sparta Wwtp, at 1977. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1977 ran 0.5 C (0.8 F) higher than in the years before (likely change).

Suspected changes in the annual mean temperature at Sparta Wwtp, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1977	+0.5	+0.8	likely	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Climate Twins

2007 to 2025 against 1961 to 1990

Over 2007 to 2025, Sparta Wwtp had a mean temperature of 14.8 C (58.7 F) and 1,474.5 mm (58.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Ashwood (United States, 154 km away), Hamilton (United States, 302 km away) and Saint Bernard (United States, 228 km away).

Climate twins of Sparta Wwtp: stations whose 1961 to 1990 climate is closest to its 2007 to 2025 climate
Twin station	Country	Distance away	Mean temperature, 1961-1990	Rain a year, 1961-1990	Climate difference
Ashwood	United States	154 km (96 mi)	14.8 C (58.6 F)	1,499.4 mm (59.0 in)	0.55
Hamilton	United States	302 km (188 mi)	14.9 C (58.8 F)	1,507.2 mm (59.3 in)	0.59
Saint Bernard	United States	228 km (142 mi)	15.0 C (59.1 F)	1,455.2 mm (57.3 in)	0.60

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

Data for Sparta Wwtp standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Sparta Wwtp 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 2026-10-14. Last revised 14 October 2026 (2026-10-14).