Howell Wwtp Weather Records (USC00203947)

Record envelope, standing records and threshold days for Howell Wwtp (USC00203947), Michigan, United States, with 124 years of record.

Key Facts for Howell Wwtp

Howell Wwtp (USC00203947) is a weather station in Michigan, United States at 42.59 latitude and -83.93 longitude, 280 m (917 ft) above sea level.
The station reports from 1891 to 2014, 124 years of record.
1,464 records set at Howell Wwtp still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Howell Wwtp set a daily record low minimum temperature of -3.3 C (26.1 F) on 12 October 2014.

About the Station

Location: Michigan, United States, 42.59 latitude, -83.93 longitude.
Elevation: 280 m (917 ft).
Period of record: 1891 to 2014, 124 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 Howell Wwtp. 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 Howell Wwtp, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.7 C (62.1 F)	-33.3 C (-27.9 F)	n/a	n/a
Feb	16.7 C (62.1 F)	-31.1 C (-24.0 F)	n/a	n/a
Mar	30.6 C (87.1 F)	-23.9 C (-11.0 F)	n/a	n/a
Apr	31.7 C (89.1 F)	-13.3 C (8.1 F)	n/a	n/a
May	35.0 C (95.0 F)	-5.6 C (21.9 F)	n/a	n/a
Jun	37.2 C (99.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	38.3 C (100.9 F)	2.2 C (36.0 F)	n/a	n/a
Aug	41.1 C (106.0 F)	-0.6 C (30.9 F)	n/a	n/a
Sep	36.1 C (97.0 F)	-6.1 C (21.0 F)	n/a	n/a
Oct	32.2 C (90.0 F)	-10.0 C (14.0 F)	n/a	n/a
Nov	23.9 C (75.0 F)	-17.8 C (0.0 F)	n/a	n/a
Dec	16.7 C (62.1 F)	-25.6 C (-14.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Howell Wwtp still stand. 1895 holds the most, with 62.

Standing records at Howell Wwtp by the year they were set
Year set	Standing records
1891	12
1892	35
1893	38
1894	56
1895	62
1896	55
1897	46
1898	34
1899	32
1900	20
1901	27
1902	32
1903	35
1904	24
1905	21
1906	36
1907	24
1908	16
1909	33
1910	26
1911	34
1912	38
1913	35
1914	26
1915	34
1916	28
1917	34
1918	42
1919	18
1920	39
1921	21
1922	21
1923	39
1924	22
1925	36
1926	22
1927	30
1928	11
2004	27
2005	23
2006	32
2007	30
2008	17
2009	21
2010	11
2011	13
2012	41
2013	24
2014	31

All-Time Record Progression

3 new records

3 all-time records were set at Howell Wwtp between 27 January 1967 and 19 April 1975. Each dot is a new record.

When Howell Wwtp set new all-time records
Date	Kind	Detail
1967-01-27	Record daily snowfall	Record daily snowfall 58.4 cm (23.0 in)
1967-01-27	Record snow depth	Record snow depth 58.4 cm (23.0 in)
1975-04-19	Record daily precipitation	Record daily precipitation 104.6 mm (4.1 in)

Wettest Day of Each Month

Apr: 104.6 mm (4.1 in)

The wettest day on record for each calendar month at Howell Wwtp. The most was 104.6 mm (4.1 in) on 19 April 1975.

Record daily precipitation for each month at Howell Wwtp
Month	Record daily precipitation (mm)	Date
Jan	88.6 mm (3.5 in)	27 January 1967
Feb	62.0 mm (2.4 in)	14 February 1950
Mar	53.3 mm (2.1 in)	14 March 1918
Apr	104.6 mm (4.1 in)	19 April 1975
May	66.8 mm (2.6 in)	10 May 1948
Jun	86.6 mm (3.4 in)	26 June 1968
Jul	85.1 mm (3.4 in)	26 July 1897
Aug	91.4 mm (3.6 in)	10 August 1896
Sep	95.3 mm (3.8 in)	17 September 1905
Oct	98.3 mm (3.9 in)	1 October 1981
Nov	55.4 mm (2.2 in)	17 November 1952
Dec	54.4 mm (2.1 in)	25 December 1965

Period of Record Coverage

1891 to 2014

49 years of record at Howell Wwtp, 1891 to 2014. 14 years have data for under 90 percent of days and are left out of rankings: 1891, 1896, 1899, 1901, 1902, 1903, 1904, 1908 and others.

Days with data per year at Howell Wwtp
Year	Days with data	Share of year	Complete
1891	86	24%	No
1892	358	98%	Yes
1893	353	97%	Yes
1894	356	98%	Yes
1895	350	96%	Yes
1896	318	87%	No
1897	357	98%	Yes
1898	332	91%	Yes
1899	295	81%	No
1900	364	100%	Yes
1901	268	73%	No
1902	328	90%	No
1903	320	88%	No
1904	199	54%	No
1905	348	95%	Yes
1906	354	97%	Yes
1907	335	92%	Yes
1908	269	73%	No
1909	297	81%	No
1910	289	79%	No
1911	356	98%	Yes
1912	361	99%	Yes
1913	353	97%	Yes
1914	337	92%	Yes
1915	337	92%	Yes
1916	354	97%	Yes
1917	362	99%	Yes
1918	348	95%	Yes
1919	347	95%	Yes
1920	352	96%	Yes
1921	325	89%	No
1922	362	99%	Yes
1923	363	99%	Yes
1924	289	79%	No
1925	363	99%	Yes
1926	343	94%	Yes
1927	361	99%	Yes
1928	153	42%	No
2004	362	99%	Yes
2005	363	99%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	364	99%	Yes
2009	363	99%	Yes
2010	360	99%	Yes
2011	353	97%	Yes
2012	365	100%	Yes
2013	363	99%	Yes
2014	303	83%	No

Latest Records

Latest records at Howell Wwtp
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 October 2014	Howell Wwtp, US	daily low min	-3.3 C (26.1 F)	1.1 C (2.0 F)	108 years	42 of 100 (Notable)
5 October 2014	Howell Wwtp, US	daily low max	9.4 C (48.9 F)	0.6 C (1.1 F)	96 years	39 of 100 (Notable)
15 September 2014	Howell Wwtp, US	daily low max	17.2 C (63.0 F)	0.6 C (1.1 F)	109 years	41 of 100 (Notable)
14 September 2014	Howell Wwtp, US	daily low max	14.4 C (57.9 F)	0.6 C (1.1 F)	0 years	11 of 100 (Routine)
14 September 2014	Howell Wwtp, US	daily low min (Tie)	1.1 C (34.0 F)	tie	0 years	2 of 100 (Routine)
13 September 2014	Howell Wwtp, US	daily low max	14.4 C (57.9 F)	1.2 C (2.2 F)	91 years	39 of 100 (Notable)
12 September 2014	Howell Wwtp, US	daily low max	13.9 C (57.0 F)	3.9 C (7.0 F)	91 years	44 of 100 (Notable)
15 August 2014	Howell Wwtp, US	daily low min	5.6 C (42.1 F)	0.5 C (0.9 F)	0 years	11 of 100 (Routine)
17 July 2014	Howell Wwtp, US	daily low max	21.1 C (70.0 F)	1.7 C (3.1 F)	103 years	44 of 100 (Notable)
16 July 2014	Howell Wwtp, US	daily low max	21.1 C (70.0 F)	1.1 C (2.0 F)	93 years	40 of 100 (Notable)
14 June 2014	Howell Wwtp, US	daily low min (Tie)	4.4 C (39.9 F)	tie	88 years	9 of 100 (Routine)
14 May 2014	Howell Wwtp, US	daily high max	30.0 C (86.0 F)	1.7 C (3.1 F)	3 years	12 of 100 (Routine)
13 May 2014	Howell Wwtp, US	daily rain	45.0 mm (1.8 in)	18.6 mm (0.7 in)	57 years	47 of 100 (Notable)
6 May 2014	Howell Wwtp, US	daily low min (Tie)	0.0 C (32.0 F)	tie	108 years	10 of 100 (Routine)
16 April 2014	Howell Wwtp, US	daily low max	1.1 C (34.0 F)	2.2 C (4.0 F)	107 years	43 of 100 (Notable)
14 April 2014	Howell Wwtp, US	daily high min	13.9 C (57.0 F)	2.2 C (4.0 F)	117 years	44 of 100 (Notable)
27 March 2014	Howell Wwtp, US	daily low min	-16.1 C (3.0 F)	4.4 C (7.9 F)	3 years	17 of 100 (Routine)
26 March 2014	Howell Wwtp, US	daily low min	-16.7 C (1.9 F)	3.9 C (7.0 F)	119 years	46 of 100 (Notable)
24 March 2014	Howell Wwtp, US	daily low max	-2.8 C (27.0 F)	0.6 C (1.1 F)	108 years	40 of 100 (Notable)
17 March 2014	Howell Wwtp, US	daily low max	-5.0 C (23.0 F)	2.2 C (4.0 F)	121 years	43 of 100 (Notable)

Climate Trend

31 complete years, 1892 to 2013

One stripe for each of 31 complete years at Howell Wwtp, 1892 to 2013. Blue stripes are years cooler than the station's own mean of 8.4 C (47.2 F); red stripes are warmer. The coolest year was 1917, at 6.3 C (43.3 F), and the warmest was 2012, at 10.2 C (50.3 F). The strongest colour marks a difference of 2.2 C (4.0 F).

Annual mean temperature at Howell Wwtp as warming stripes, 1892 to 2013
Year	Annual mean temperature	Difference from the station mean
1892	7.5 C	-0.97 C
1893	7.1 C	-1.32 C
1894	8.8 C	+0.34 C
1895	7.2 C	-1.29 C
1897	8.4 C	-0.05 C
1906	8.6 C	+0.19 C
1907	7.0 C	-1.44 C
1911	8.7 C	+0.29 C
1912	7.4 C	-1.09 C
1913	9.4 C	+0.92 C
1914	8.4 C	-0.08 C
1915	7.9 C	-0.53 C
1916	8.7 C	+0.22 C
1917	6.3 C	-2.15 C
1918	8.6 C	+0.18 C
1919	9.1 C	+0.65 C
1920	8.2 C	-0.27 C
1922	9.4 C	+0.91 C
1923	8.7 C	+0.29 C
1925	8.7 C	+0.28 C
1927	9.1 C	+0.64 C
2004	8.4 C	-0.04 C
2005	8.7 C	+0.30 C
2006	9.6 C	+1.11 C
2007	9.1 C	+0.61 C
2008	8.2 C	-0.23 C
2009	8.0 C	-0.46 C
2010	9.4 C	+0.94 C
2011	8.9 C	+0.43 C
2012	10.2 C	+1.73 C
2013	8.2 C	-0.24 C

The annual mean temperature here has risen by 0.07 C (0.01 to 0.14) per decade over 1892 to 2013. In Fahrenheit: 0.13 F (0.02 to 0.24) 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 Howell Wwtp
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.07 C (0.01 to 0.14) per decade	0.13 F (0.02 to 0.24) per decade	1892 to 2013	31	Rise
Mean daily maximum	0.10 C (0.03 to 0.18) per decade	0.18 F (0.05 to 0.32) per decade	1892 to 2013	31	Rise
Mean daily minimum	0.05 C (-0.03 to 0.12) per decade	0.1 F (-0.1 to 0.2) per decade	1892 to 2013	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

1891 to 2014

Yearly extremes at Howell Wwtp: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.1 C (106.0 F)	1918	35.6 C (96.1 F)	49
Coldest night (TNn)	-33.3 C (-27.9 F)	1892	-24.4 C (-11.9 F)	49
Wettest day (Rx1day)	104.6 mm (4.1 in)	1975	47.0 mm (1.9 in)	115
Wettest five days (Rx5day)	154.9 mm (6.1 in)	1921	73.6 mm (2.9 in)	115
Longest dry spell (CDD)	45 days	1969	20 days	115

Hottest day (TXx)

The hottest day of the year at Howell Wwtp, 1891 to 2014. The record is 41.1 C (106.0 F) in 1918, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at Howell Wwtp by year
Year	Hottest day (TXx)
1891	36.1 C (97.0 F)
1892	36.1 C (97.0 F)
1893	36.1 C (97.0 F)
1894	38.3 C (100.9 F)
1895	36.7 C (98.1 F)
1896	35.6 C (96.1 F)
1897	37.2 C (99.0 F)
1898	35.6 C (96.1 F)
1899	33.3 C (91.9 F)
1900	36.7 C (98.1 F)
1901	36.7 C (98.1 F)
1902	33.3 C (91.9 F)
1903	31.1 C (88.0 F)
1904	30.6 C (87.1 F)
1905	32.2 C (90.0 F)
1906	34.4 C (93.9 F)
1907	31.7 C (89.1 F)
1908	35.6 C (96.1 F)
1909	33.9 C (93.0 F)
1910	35.0 C (95.0 F)
1911	37.8 C (100.0 F)
1912	32.8 C (91.0 F)
1913	36.1 C (97.0 F)
1914	33.9 C (93.0 F)
1915	31.7 C (89.1 F)
1916	37.8 C (100.0 F)
1917	37.2 C (99.0 F)
1918	41.1 C (106.0 F)
1919	35.6 C (96.1 F)
1920	35.0 C (95.0 F)
1921	36.7 C (98.1 F)
1922	36.7 C (98.1 F)
1923	36.1 C (97.0 F)
1924	34.4 C (93.9 F)
1925	38.3 C (100.9 F)
1926	37.2 C (99.0 F)
1927	35.6 C (96.1 F)
1928	35.0 C (95.0 F)
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	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
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	33.3 C (91.9 F)
2005	34.4 C (93.9 F)
2006	36.7 C (98.1 F)
2007	35.0 C (95.0 F)
2008	33.9 C (93.0 F)
2009	33.9 C (93.0 F)
2010	34.4 C (93.9 F)
2011	36.1 C (97.0 F)
2012	38.3 C (100.9 F)
2013	34.4 C (93.9 F)
2014	33.9 C (93.0 F)

Coldest night (TNn)

The coldest night of the year at Howell Wwtp, 1891 to 2014. The record is -33.3 C (-27.9 F) in 1892, marked on the chart; the median year is -24.4 C (-11.9 F).

Coldest night (TNn) at Howell Wwtp by year
Year	Coldest night (TNn)
1891	-12.2 C (10.0 F)
1892	-33.3 C (-27.9 F)
1893	-30.6 C (-23.1 F)
1894	-27.2 C (-17.0 F)
1895	-29.4 C (-20.9 F)
1896	-27.8 C (-18.0 F)
1897	-24.4 C (-11.9 F)
1898	-23.3 C (-9.9 F)
1899	-31.1 C (-24.0 F)
1900	-25.0 C (-13.0 F)
1901	-30.0 C (-22.0 F)
1902	-23.3 C (-9.9 F)
1903	-24.4 C (-11.9 F)
1904	-27.8 C (-18.0 F)
1905	-27.8 C (-18.0 F)
1906	-23.3 C (-9.9 F)
1907	-26.1 C (-15.0 F)
1908	-25.6 C (-14.1 F)
1909	-25.0 C (-13.0 F)
1910	-21.1 C (-6.0 F)
1911	-19.4 C (-2.9 F)
1912	-31.1 C (-24.0 F)
1913	-20.0 C (-4.0 F)
1914	-26.1 C (-15.0 F)
1915	-23.3 C (-9.9 F)
1916	-24.4 C (-11.9 F)
1917	-29.4 C (-20.9 F)
1918	-30.0 C (-22.0 F)
1919	-18.3 C (-0.9 F)
1920	-25.0 C (-13.0 F)
1921	-15.0 C (5.0 F)
1922	-23.3 C (-9.9 F)
1923	-22.2 C (-8.0 F)
1924	-24.4 C (-11.9 F)
1925	-24.4 C (-11.9 F)
1926	-22.2 C (-8.0 F)
1927	-27.8 C (-18.0 F)
1928	-21.7 C (-7.1 F)
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	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
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	-26.7 C (-16.1 F)
2005	-24.4 C (-11.9 F)
2006	-17.2 C (1.0 F)
2007	-21.7 C (-7.1 F)
2008	-21.7 C (-7.1 F)
2009	-26.7 C (-16.1 F)
2010	-17.2 C (1.0 F)
2011	-22.2 C (-8.0 F)
2012	-18.3 C (-0.9 F)
2013	-20.6 C (-5.1 F)
2014	-27.2 C (-17.0 F)

Wettest day (Rx1day)

The wettest day of the year at Howell Wwtp, 1891 to 2014. The record is 104.6 mm (4.1 in) in 1975, marked on the chart; the median year is 47.0 mm (1.9 in).

Wettest day (Rx1day) at Howell Wwtp by year
Year	Wettest day (Rx1day)
1891	30.5 mm (1.2 in)
1892	44.5 mm (1.8 in)
1893	37.1 mm (1.5 in)
1894	36.3 mm (1.4 in)
1895	40.6 mm (1.6 in)
1896	91.4 mm (3.6 in)
1897	85.1 mm (3.4 in)
1898	35.6 mm (1.4 in)
1899	29.5 mm (1.2 in)
1900	43.9 mm (1.7 in)
1901	25.4 mm (1.0 in)
1902	30.5 mm (1.2 in)
1903	32.8 mm (1.3 in)
1904	25.9 mm (1.0 in)
1905	95.3 mm (3.8 in)
1906	43.2 mm (1.7 in)
1907	47.0 mm (1.9 in)
1908	50.8 mm (2.0 in)
1909	63.5 mm (2.5 in)
1910	40.6 mm (1.6 in)
1911	61.0 mm (2.4 in)
1912	48.3 mm (1.9 in)
1913	41.1 mm (1.6 in)
1914	72.4 mm (2.9 in)
1915	44.5 mm (1.8 in)
1916	48.3 mm (1.9 in)
1917	49.8 mm (2.0 in)
1918	53.3 mm (2.1 in)
1919	50.8 mm (2.0 in)
1920	48.3 mm (1.9 in)
1921	78.7 mm (3.1 in)
1922	38.1 mm (1.5 in)
1923	35.6 mm (1.4 in)
1924	48.3 mm (1.9 in)
1925	51.6 mm (2.0 in)
1926	43.2 mm (1.7 in)
1927	44.5 mm (1.8 in)
1928	25.4 mm (1.0 in)
1938	18.3 mm (0.7 in)
1939	43.7 mm (1.7 in)
1940	44.5 mm (1.8 in)
1941	40.9 mm (1.6 in)
1942	45.7 mm (1.8 in)
1943	54.9 mm (2.2 in)
1944	29.2 mm (1.1 in)
1945	58.4 mm (2.3 in)
1946	38.1 mm (1.5 in)
1947	66.0 mm (2.6 in)
1948	66.8 mm (2.6 in)
1949	52.6 mm (2.1 in)
1950	62.0 mm (2.4 in)
1951	36.1 mm (1.4 in)
1952	55.4 mm (2.2 in)
1953	30.5 mm (1.2 in)
1954	73.7 mm (2.9 in)
1955	49.0 mm (1.9 in)
1956	67.8 mm (2.7 in)
1957	47.5 mm (1.9 in)
1958	58.4 mm (2.3 in)
1959	41.7 mm (1.6 in)
1960	43.7 mm (1.7 in)
1961	54.6 mm (2.1 in)
1962	47.0 mm (1.9 in)
1963	75.9 mm (3.0 in)
1964	39.9 mm (1.6 in)
1965	54.4 mm (2.1 in)
1966	73.4 mm (2.9 in)
1967	88.6 mm (3.5 in)
1968	86.6 mm (3.4 in)
1969	51.3 mm (2.0 in)
1970	44.5 mm (1.8 in)
1971	31.8 mm (1.3 in)
1972	66.8 mm (2.6 in)
1973	27.2 mm (1.1 in)
1974	38.9 mm (1.5 in)
1975	104.6 mm (4.1 in)
1976	35.8 mm (1.4 in)
1977	51.3 mm (2.0 in)
1978	26.9 mm (1.1 in)
1979	61.5 mm (2.4 in)
1980	66.3 mm (2.6 in)
1981	98.3 mm (3.9 in)
1982	70.6 mm (2.8 in)
1983	34.0 mm (1.3 in)
1984	49.5 mm (1.9 in)
1985	66.0 mm (2.6 in)
1986	55.4 mm (2.2 in)
1987	27.9 mm (1.1 in)
1988	42.7 mm (1.7 in)
1989	40.6 mm (1.6 in)
1990	70.4 mm (2.8 in)
1991	34.3 mm (1.4 in)
1992	55.4 mm (2.2 in)
1993	72.4 mm (2.9 in)
1994	66.0 mm (2.6 in)
1995	41.7 mm (1.6 in)
1996	48.3 mm (1.9 in)
1997	31.5 mm (1.2 in)
1998	34.8 mm (1.4 in)
1999	44.2 mm (1.7 in)
2000	59.7 mm (2.4 in)
2001	37.1 mm (1.5 in)
2002	20.3 mm (0.8 in)
2003	46.5 mm (1.8 in)
2004	52.3 mm (2.1 in)
2005	23.6 mm (0.9 in)
2006	54.9 mm (2.2 in)
2007	47.0 mm (1.9 in)
2008	80.5 mm (3.2 in)
2009	46.2 mm (1.8 in)
2010	45.5 mm (1.8 in)
2011	66.3 mm (2.6 in)
2012	54.6 mm (2.1 in)
2013	49.0 mm (1.9 in)
2014	45.0 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Howell Wwtp, 1891 to 2014. The record is 154.9 mm (6.1 in) in 1921, marked on the chart; the median year is 73.6 mm (2.9 in).

Wettest five days (Rx5day) at Howell Wwtp by year
Year	Wettest five days (Rx5day)
1891	49.8 mm (2.0 in)
1892	75.7 mm (3.0 in)
1893	58.9 mm (2.3 in)
1894	57.4 mm (2.3 in)
1895	90.1 mm (3.5 in)
1896	114.6 mm (4.5 in)
1897	85.1 mm (3.4 in)
1898	74.2 mm (2.9 in)
1899	53.9 mm (2.1 in)
1900	69.3 mm (2.7 in)
1901	50.8 mm (2.0 in)
1902	38.1 mm (1.5 in)
1903	55.7 mm (2.2 in)
1904	34.3 mm (1.4 in)
1905	101.9 mm (4.0 in)
1906	57.9 mm (2.3 in)
1907	64.3 mm (2.5 in)
1908	73.7 mm (2.9 in)
1909	82.0 mm (3.2 in)
1910	77.1 mm (3.0 in)
1911	92.7 mm (3.6 in)
1912	71.2 mm (2.8 in)
1913	74.9 mm (2.9 in)
1914	116.8 mm (4.6 in)
1915	73.2 mm (2.9 in)
1916	55.2 mm (2.2 in)
1917	62.5 mm (2.5 in)
1918	75.4 mm (3.0 in)
1919	70.7 mm (2.8 in)
1920	48.8 mm (1.9 in)
1921	154.9 mm (6.1 in)
1922	70.4 mm (2.8 in)
1923	53.4 mm (2.1 in)
1924	67.3 mm (2.6 in)
1925	72.0 mm (2.8 in)
1926	48.0 mm (1.9 in)
1927	106.8 mm (4.2 in)
1928	54.4 mm (2.1 in)
1938	26.9 mm (1.1 in)
1939	53.4 mm (2.1 in)
1940	51.1 mm (2.0 in)
1941	68.8 mm (2.7 in)
1942	65.8 mm (2.6 in)
1943	80.5 mm (3.2 in)
1944	41.5 mm (1.6 in)
1945	98.1 mm (3.9 in)
1946	54.8 mm (2.2 in)
1947	97.5 mm (3.8 in)
1948	111.8 mm (4.4 in)
1949	86.8 mm (3.4 in)
1950	83.9 mm (3.3 in)
1951	64.0 mm (2.5 in)
1952	77.4 mm (3.0 in)
1953	40.9 mm (1.6 in)
1954	109.3 mm (4.3 in)
1955	58.2 mm (2.3 in)
1956	108.9 mm (4.3 in)
1957	80.6 mm (3.2 in)
1958	99.1 mm (3.9 in)
1959	98.0 mm (3.9 in)
1960	73.6 mm (2.9 in)
1961	78.2 mm (3.1 in)
1962	89.9 mm (3.5 in)
1963	111.5 mm (4.4 in)
1964	53.9 mm (2.1 in)
1965	57.2 mm (2.3 in)
1966	98.3 mm (3.9 in)
1967	91.9 mm (3.6 in)
1968	149.6 mm (5.9 in)
1969	80.7 mm (3.2 in)
1970	73.8 mm (2.9 in)
1971	54.7 mm (2.2 in)
1972	66.8 mm (2.6 in)
1973	48.0 mm (1.9 in)
1974	75.7 mm (3.0 in)
1975	105.6 mm (4.2 in)
1976	57.4 mm (2.3 in)
1977	51.6 mm (2.0 in)
1978	58.4 mm (2.3 in)
1979	70.3 mm (2.8 in)
1980	66.3 mm (2.6 in)
1981	118.9 mm (4.7 in)
1982	82.0 mm (3.2 in)
1983	49.4 mm (1.9 in)
1984	65.3 mm (2.6 in)
1985	72.9 mm (2.9 in)
1986	77.3 mm (3.0 in)
1987	47.0 mm (1.9 in)
1988	78.1 mm (3.1 in)
1989	61.7 mm (2.4 in)
1990	84.2 mm (3.3 in)
1991	48.8 mm (1.9 in)
1992	109.1 mm (4.3 in)
1993	82.1 mm (3.2 in)
1994	86.3 mm (3.4 in)
1995	75.2 mm (3.0 in)
1996	68.6 mm (2.7 in)
1997	52.6 mm (2.1 in)
1998	57.5 mm (2.3 in)
1999	81.4 mm (3.2 in)
2000	75.7 mm (3.0 in)
2001	75.3 mm (3.0 in)
2002	39.6 mm (1.6 in)
2003	59.4 mm (2.3 in)
2004	77.9 mm (3.1 in)
2005	53.7 mm (2.1 in)
2006	82.9 mm (3.3 in)
2007	89.9 mm (3.5 in)
2008	150.6 mm (5.9 in)
2009	75.2 mm (3.0 in)
2010	69.9 mm (2.8 in)
2011	104.4 mm (4.1 in)
2012	67.7 mm (2.7 in)
2013	86.0 mm (3.4 in)
2014	80.3 mm (3.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Howell Wwtp, 1891 to 2014. The record is 45 days in 1969, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Howell Wwtp by year
Year	Longest dry spell (CDD)
1891	8 days
1892	15 days
1893	17 days
1894	21 days
1895	18 days
1896	13 days
1897	39 days
1898	20 days
1899	37 days
1900	21 days
1901	33 days
1902	20 days
1903	27 days
1904	24 days
1905	18 days
1906	24 days
1907	26 days
1908	30 days
1909	24 days
1910	26 days
1911	14 days
1912	18 days
1913	24 days
1914	22 days
1915	24 days
1916	18 days
1917	27 days
1918	23 days
1919	22 days
1920	28 days
1921	30 days
1922	22 days
1923	22 days
1924	26 days
1925	18 days
1926	36 days
1927	24 days
1928	13 days
1938	7 days
1939	28 days
1940	12 days
1941	14 days
1942	22 days
1943	20 days
1944	24 days
1945	15 days
1946	22 days
1947	23 days
1948	19 days
1949	18 days
1950	16 days
1951	12 days
1952	14 days
1953	23 days
1954	16 days
1955	27 days
1956	27 days
1957	31 days
1958	30 days
1959	19 days
1960	28 days
1961	25 days
1962	25 days
1963	29 days
1964	17 days
1965	16 days
1966	19 days
1967	25 days
1968	13 days
1969	45 days
1970	16 days
1971	13 days
1972	14 days
1973	28 days
1974	17 days
1975	15 days
1976	26 days
1977	15 days
1978	14 days
1979	18 days
1980	19 days
1981	20 days
1982	22 days
1983	20 days
1984	27 days
1985	14 days
1986	20 days
1987	14 days
1988	38 days
1989	21 days
1990	17 days
1991	12 days
1992	28 days
1993	14 days
1994	14 days
1995	21 days
1996	14 days
1997	12 days
1998	16 days
1999	26 days
2000	16 days
2001	26 days
2002	20 days
2003	22 days
2004	22 days
2005	30 days
2006	19 days
2007	17 days
2008	16 days
2009	17 days
2010	18 days
2011	12 days
2012	13 days
2013	23 days
2014	11 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 Howell Wwtp falls on 10 May and the median first autumn frost on 3 October, which leaves a median of 147 days between them.

Fitted over all years, the growing season changes by -0.1 days per decade at this station.

Frost dates and growing season at Howell Wwtp
Measure	Median, all years	Earliest period	Recent period (1893 to 2013)	Recent against earliest	Fitted trend
Last spring frost	10 May	n/a	12 May	n/a	+0.3 days per decade
First autumn frost	3 October	n/a	3 October	n/a	+0.2 days per decade
Growing days	147 days	n/a	147 days	n/a	-0.1 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

102 years, 1893 to 2013

A day with at least 49.2 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 107.7 mm (4.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Howell 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	49.2 mm (1.9 in)
5 years	64.6 mm (2.5 in)
10 years	74.9 mm (2.9 in)
25 years	88.0 mm (3.5 in)
50 years	97.9 mm (3.9 in)
100 years	107.7 mm (4.2 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 102 years of values from 1893 to 2013.

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: 104.6 mm (4.1 in) in 1975; 98.3 mm (3.9 in) in 1981; 95.3 mm (3.8 in) in 1905.

Download the Data

Data for Howell Wwtp standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Howell 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 2026-10-12 (12 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).