Monroe Weather Records (USC00205558)

Record envelope, standing records and threshold days for Monroe (USC00205558), Michigan, United States, with 88 years of record.

Key Facts for Monroe

Monroe (USC00205558) is a weather station in Michigan, United States at 41.91 latitude and -83.39 longitude, 180 m (590 ft) above sea level.
The station reports from 1917 to 2004, 88 years of record.
1,464 records set at Monroe still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Monroe set a daily record low maximum temperature of 0.6 C (33.1 F) on 9 April 2003.

About the Station

Location: Michigan, United States, 41.91 latitude, -83.39 longitude.
Elevation: 180 m (590 ft).
Period of record: 1917 to 2004, 88 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 Monroe. 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 Monroe, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	21.1 C (70.0 F)	-27.8 C (-18.0 F)	n/a	n/a
Feb	21.7 C (71.1 F)	-29.4 C (-20.9 F)	n/a	n/a
Mar	28.3 C (82.9 F)	-18.9 C (-2.0 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-11.7 C (10.9 F)	n/a	n/a
May	35.0 C (95.0 F)	-3.3 C (26.1 F)	n/a	n/a
Jun	41.1 C (106.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	41.1 C (106.0 F)	1.7 C (35.1 F)	n/a	n/a
Aug	39.4 C (102.9 F)	3.3 C (37.9 F)	n/a	n/a
Sep	39.4 C (102.9 F)	-2.8 C (27.0 F)	n/a	n/a
Oct	33.3 C (91.9 F)	-6.1 C (21.0 F)	n/a	n/a
Nov	30.6 C (87.1 F)	-17.2 C (1.0 F)	n/a	n/a
Dec	20.6 C (69.1 F)	-24.4 C (-11.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Monroe still stand. 1930 holds the most, with 50.

Standing records at Monroe by the year they were set
Year set	Standing records
1917	40
1918	37
1919	14
1920	34
1921	19
1922	7
1923	19
1924	15
1925	42
1926	12
1927	32
1928	28
1929	40
1930	50
1931	34
1932	13
1933	26
1934	20
1935	19
1936	34
1937	13
1938	16
1939	14
1940	17
1941	18
1942	25
1943	17
1944	17
1945	25
1946	16
1947	14
1948	8
1949	8
1950	26
1951	18
1952	11
1953	11
1954	13
1955	5
1956	8
1957	7
1958	6
1959	13
1960	10
1961	3
1962	19
1963	22
1964	12
1965	19
1966	9
1967	16
1968	12
1969	11
1970	4
1971	10
1972	17
1973	13
1974	14
1975	11
1976	20
1977	25
1978	12
1979	17
1980	7
1981	13
1982	20
1983	15
1984	15
1985	16
1986	17
1987	9
1988	22
1989	20
1990	21
1991	29
1992	10
1993	6
1994	13
1995	10
1996	11
1997	12
1998	14
1999	13
2000	15
2001	6
2002	10
2003	3

All-Time Record Progression

7 new records

7 all-time records were set at Monroe between 25 February 1965 and 19 January 1994. Each dot is a new record.

When Monroe set new all-time records
Date	Kind	Detail
1965-02-25	Record daily snowfall	Record daily snowfall 32.5 cm (12.8 in)
1970-01-08	Record low maximum temperature	Record low maximum temperature -16.7 C (1.9 F)
1974-12-02	Record snow depth	Record snow depth 50.8 cm (20.0 in)
1985-01-21	Record low maximum temperature	Record low maximum temperature -18.3 C (-0.9 F)
1987-08-27	Record daily precipitation	Record daily precipitation 107.2 mm (4.2 in)
1992-01-14	Record daily snowfall	Record daily snowfall 33.0 cm (13.0 in)
1994-01-19	Record low maximum temperature	Record low maximum temperature -20.0 C (-4.0 F)

Wettest Day of Each Month

Aug: 107.2 mm (4.2 in)

The wettest day on record for each calendar month at Monroe. The most was 107.2 mm (4.2 in) on 27 August 1987.

Record daily precipitation for each month at Monroe
Month	Record daily precipitation (mm)	Date
Jan	50.0 mm (2.0 in)	27 January 1978
Feb	44.2 mm (1.7 in)	14 February 1950
Mar	50.5 mm (2.0 in)	1 March 1976
Apr	63.5 mm (2.5 in)	19 April 1929
May	64.0 mm (2.5 in)	26 May 1968
Jun	69.6 mm (2.7 in)	23 June 1944
Jul	72.4 mm (2.9 in)	5 July 1977
Aug	107.2 mm (4.2 in)	27 August 1987
Sep	103.6 mm (4.1 in)	6 September 1917
Oct	67.8 mm (2.7 in)	12 October 1949
Nov	54.6 mm (2.1 in)	2 November 1982
Dec	69.9 mm (2.8 in)	21 December 1967

Period of Record Coverage

1917 to 2003

87 years of record at Monroe, 1917 to 2003. 8 years have data for under 90 percent of days and are left out of rankings: 1917, 1972, 1982, 1995, 1998, 2001, 2002, 2003.

Days with data per year at Monroe
Year	Days with data	Share of year	Complete
1917	272	75%	No
1918	365	100%	Yes
1919	365	100%	Yes
1920	351	96%	Yes
1921	362	99%	Yes
1922	363	99%	Yes
1923	364	100%	Yes
1924	364	99%	Yes
1925	360	99%	Yes
1926	365	100%	Yes
1927	360	99%	Yes
1928	359	98%	Yes
1929	363	99%	Yes
1930	359	98%	Yes
1931	364	100%	Yes
1932	363	99%	Yes
1933	359	98%	Yes
1934	365	100%	Yes
1935	363	99%	Yes
1936	365	100%	Yes
1937	364	100%	Yes
1938	365	100%	Yes
1939	364	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	364	100%	Yes
1943	365	100%	Yes
1944	365	100%	Yes
1945	365	100%	Yes
1946	361	99%	Yes
1947	365	100%	Yes
1948	366	100%	Yes
1949	361	99%	Yes
1950	364	100%	Yes
1951	364	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	361	99%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	364	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	364	100%	Yes
1972	293	80%	No
1973	359	98%	Yes
1974	363	99%	Yes
1975	360	99%	Yes
1976	363	99%	Yes
1977	362	99%	Yes
1978	360	99%	Yes
1979	361	99%	Yes
1980	365	100%	Yes
1981	358	98%	Yes
1982	325	89%	No
1983	358	98%	Yes
1984	364	99%	Yes
1985	363	99%	Yes
1986	361	99%	Yes
1987	364	100%	Yes
1988	365	100%	Yes
1989	363	99%	Yes
1990	364	100%	Yes
1991	362	99%	Yes
1992	363	99%	Yes
1993	362	99%	Yes
1994	361	99%	Yes
1995	302	83%	No
1996	360	98%	Yes
1997	362	99%	Yes
1998	304	83%	No
1999	365	100%	Yes
2000	366	100%	Yes
2001	271	74%	No
2002	316	87%	No
2003	80	22%	No

Latest Records

Latest records at Monroe
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
9 April 2003	Monroe, US	daily low max	0.6 C (33.1 F)	1.6 C (2.9 F)	82 years	34 of 100 (Routine)
7 April 2003	Monroe, US	daily snow depth	2.5 cm (1.0 in)	2.5 cm (1.0 in)	82 years	20 of 100 (Routine)
14 March 2003	Monroe, US	daily snow depth (Tie)	5.1 cm (2.0 in)	tie	46 years	5 of 100 (Routine)
10 March 2003	Monroe, US	daily low max	-5.0 C (23.0 F)	0.6 C (1.1 F)	68 years	28 of 100 (Routine)
3 March 2003	Monroe, US	monthly low min (Tie)	-18.9 C (-2.0 F)	tie	77 years	10 of 100 (Routine)
27 January 2003	Monroe, US	daily low min	-21.7 C (-7.1 F)	1.7 C (3.1 F)	76 years	32 of 100 (Routine)
3 December 2002	Monroe, US	daily snowfall	12.7 cm (5.0 in)	4.1 cm (1.6 in)	37 years	28 of 100 (Routine)
11 November 2002	Monroe, US	daily rain	35.8 mm (1.4 in)	11.2 mm (0.4 in)	19 years	28 of 100 (Routine)
2 August 2002	Monroe, US	daily high min (Tie)	23.9 C (75.0 F)	tie	79 years	7 of 100 (Routine)
28 July 2002	Monroe, US	daily rain	35.6 mm (1.4 in)	6.4 mm (0.25 in)	21 years	19 of 100 (Routine)
2 July 2002	Monroe, US	daily high min	24.4 C (75.9 F)	0.5 C (0.9 F)	71 years	30 of 100 (Routine)
27 June 2002	Monroe, US	daily high min (Tie)	22.2 C (72.0 F)	tie	80 years	8 of 100 (Routine)
24 June 2002	Monroe, US	daily high min (Tie)	22.8 C (73.0 F)	tie	72 years	7 of 100 (Routine)
22 May 2002	Monroe, US	daily low max	12.8 C (55.0 F)	0.5 C (0.9 F)	35 years	18 of 100 (Routine)
21 May 2002	Monroe, US	daily low max	8.3 C (46.9 F)	2.8 C (5.0 F)	84 years	37 of 100 (Notable)
19 May 2002	Monroe, US	daily low min	1.1 C (34.0 F)	1.1 C (2.0 F)	72 years	31 of 100 (Routine)
19 May 2002	Monroe, US	daily low max (Tie)	10.0 C (50.0 F)	tie	44 years	5 of 100 (Routine)
14 May 2002	Monroe, US	daily low max (Tie)	11.1 C (52.0 F)	tie	48 years	5 of 100 (Routine)
23 April 2002	Monroe, US	daily low max (Tie)	6.7 C (44.1 F)	tie	75 years	7 of 100 (Routine)
18 April 2002	Monroe, US	daily high min	17.8 C (64.0 F)	3.9 C (7.0 F)	44 years	29 of 100 (Routine)

Climate Trend

77 complete years, 1918 to 2000

One stripe for each of 77 complete years at Monroe, 1918 to 2000. Blue stripes are years cooler than the station's own mean of 10.1 C (50.1 F); red stripes are warmer. The coolest year was 1940, at 8.8 C (47.9 F), and the warmest was 1931, at 11.9 C (53.5 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Monroe as warming stripes, 1918 to 2000
Year	Annual mean temperature	Difference from the station mean
1918	9.4 C	-0.67 C
1919	10.1 C	+0.04 C
1921	11.9 C	+1.84 C
1922	10.6 C	+0.56 C
1924	9.7 C	-0.34 C
1925	10.1 C	-0.01 C
1926	9.5 C	-0.61 C
1927	11.4 C	+1.30 C
1928	11.0 C	+0.93 C
1929	9.2 C	-0.87 C
1930	10.9 C	+0.87 C
1931	11.9 C	+1.87 C
1932	10.8 C	+0.71 C
1933	10.9 C	+0.79 C
1934	10.0 C	-0.11 C
1935	9.1 C	-0.97 C
1936	9.2 C	-0.88 C
1937	9.4 C	-0.63 C
1938	10.7 C	+0.63 C
1939	10.4 C	+0.35 C
1940	8.8 C	-1.23 C
1941	10.7 C	+0.59 C
1942	9.6 C	-0.44 C
1943	9.0 C	-1.08 C
1944	9.8 C	-0.31 C
1945	9.2 C	-0.91 C
1946	10.6 C	+0.51 C
1947	9.6 C	-0.45 C
1948	9.7 C	-0.34 C
1949	10.8 C	+0.71 C
1950	9.6 C	-0.46 C
1951	9.8 C	-0.22 C
1952	10.9 C	+0.84 C
1953	11.4 C	+1.35 C
1954	10.7 C	+0.68 C
1955	10.9 C	+0.85 C
1956	10.1 C	+0.07 C
1957	10.1 C	+0.03 C
1958	9.5 C	-0.56 C
1959	10.5 C	+0.48 C
1960	10.1 C	0.00 C
1961	10.6 C	+0.56 C
1962	10.1 C	+0.06 C
1963	9.9 C	-0.15 C
1964	10.9 C	+0.86 C
1965	10.2 C	+0.18 C
1966	9.5 C	-0.54 C
1967	9.1 C	-1.01 C
1968	9.6 C	-0.46 C
1969	9.2 C	-0.89 C
1970	9.6 C	-0.51 C
1971	10.1 C	+0.03 C
1973	10.4 C	+0.29 C
1974	10.5 C	+0.43 C
1975	10.2 C	+0.14 C
1976	9.2 C	-0.87 C
1977	9.6 C	-0.47 C
1978	8.9 C	-1.20 C
1979	8.8 C	-1.22 C
1980	9.1 C	-0.92 C
1981	9.5 C	-0.59 C
1983	10.4 C	+0.33 C
1984	10.0 C	-0.07 C
1985	10.0 C	-0.06 C
1986	10.2 C	+0.18 C
1987	11.1 C	+1.02 C
1988	10.4 C	+0.37 C
1989	9.5 C	-0.58 C
1990	11.2 C	+1.16 C
1991	11.4 C	+1.36 C
1992	9.7 C	-0.39 C
1993	9.8 C	-0.23 C
1994	10.2 C	+0.18 C
1996	9.2 C	-0.85 C
1997	9.1 C	-0.98 C
1999	10.5 C	+0.47 C
2000	9.7 C	-0.32 C

The fitted trend in annual mean temperature here over 1918 to 2000 is -0.05 C (-0.12 to 0.02) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.09 F (-0.22 to 0.04) per decade. The slope is a straight line fitted to 77 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Monroe
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.05 C (-0.12 to 0.02) per decade	-0.09 F (-0.22 to 0.04) per decade	1918 to 2000	77	Not clearly different from zero
Mean daily maximum	-0.12 C (-0.21 to -0.04) per decade	-0.2 F (-0.4 to -0.1) per decade	1918 to 2000	77	Fall
Mean daily minimum	0.03 C (-0.05 to 0.10) per decade	0.05 F (-0.10 to 0.19) per decade	1918 to 2000	77	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

1917 to 2004

Yearly extremes at Monroe: 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)	1934	36.7 C (98.1 F)	87
Coldest night (TNn)	-29.4 C (-20.9 F)	1918	-20.6 C (-5.1 F)	87
Wettest day (Rx1day)	107.2 mm (4.2 in)	1987	48.3 mm (1.9 in)	88
Wettest five days (Rx5day)	126.8 mm (5.0 in)	1987	73.6 mm (2.9 in)	88
Longest dry spell (CDD)	44 days	1969	18 days	88

Hottest day (TXx)

The hottest day of the year at Monroe, 1917 to 2004. The record is 41.1 C (106.0 F) in 1934, marked on the chart; the median year is 36.7 C (98.1 F).

Hottest day (TXx) at Monroe by year
Year	Hottest day (TXx)
1917	37.8 C (100.0 F)
1918	39.4 C (102.9 F)
1919	36.7 C (98.1 F)
1920	35.6 C (96.1 F)
1921	36.7 C (98.1 F)
1922	36.1 C (97.0 F)
1923	36.7 C (98.1 F)
1924	37.2 C (99.0 F)
1925	38.9 C (102.0 F)
1926	38.9 C (102.0 F)
1927	37.8 C (100.0 F)
1928	37.2 C (99.0 F)
1929	36.7 C (98.1 F)
1930	40.6 C (105.1 F)
1931	38.3 C (100.9 F)
1932	38.3 C (100.9 F)
1933	38.9 C (102.0 F)
1934	41.1 C (106.0 F)
1935	36.7 C (98.1 F)
1936	39.4 C (102.9 F)
1937	35.6 C (96.1 F)
1938	35.0 C (95.0 F)
1939	39.4 C (102.9 F)
1940	38.9 C (102.0 F)
1941	38.9 C (102.0 F)
1942	37.8 C (100.0 F)
1943	36.1 C (97.0 F)
1944	37.8 C (100.0 F)
1945	35.6 C (96.1 F)
1946	36.7 C (98.1 F)
1947	36.7 C (98.1 F)
1948	36.7 C (98.1 F)
1949	36.7 C (98.1 F)
1950	33.3 C (91.9 F)
1951	37.2 C (99.0 F)
1952	36.7 C (98.1 F)
1953	37.2 C (99.0 F)
1954	37.8 C (100.0 F)
1955	36.7 C (98.1 F)
1956	33.9 C (93.0 F)
1957	33.9 C (93.0 F)
1958	33.3 C (91.9 F)
1959	33.9 C (93.0 F)
1960	33.9 C (93.0 F)
1961	35.0 C (95.0 F)
1962	35.0 C (95.0 F)
1963	35.6 C (96.1 F)
1964	38.3 C (100.9 F)
1965	36.1 C (97.0 F)
1966	36.7 C (98.1 F)
1967	36.1 C (97.0 F)
1968	34.4 C (93.9 F)
1969	33.9 C (93.0 F)
1970	35.0 C (95.0 F)
1971	37.8 C (100.0 F)
1972	33.3 C (91.9 F)
1973	35.6 C (96.1 F)
1974	37.8 C (100.0 F)
1975	35.6 C (96.1 F)
1976	37.2 C (99.0 F)
1977	38.9 C (102.0 F)
1978	36.7 C (98.1 F)
1979	34.4 C (93.9 F)
1980	37.2 C (99.0 F)
1981	36.1 C (97.0 F)
1982	35.6 C (96.1 F)
1983	37.8 C (100.0 F)
1984	36.7 C (98.1 F)
1985	36.1 C (97.0 F)
1986	36.7 C (98.1 F)
1987	36.7 C (98.1 F)
1988	41.1 C (106.0 F)
1989	36.1 C (97.0 F)
1990	40.0 C (104.0 F)
1991	37.8 C (100.0 F)
1992	35.0 C (95.0 F)
1993	37.2 C (99.0 F)
1994	36.7 C (98.1 F)
1995	39.4 C (102.9 F)
1996	34.4 C (93.9 F)
1997	35.0 C (95.0 F)
1998	35.6 C (96.1 F)
1999	35.0 C (95.0 F)
2000	32.8 C (91.0 F)
2001	35.0 C (95.0 F)
2002	35.6 C (96.1 F)
2003	28.9 C (84.0 F)
2004	n/a

Coldest night (TNn)

The coldest night of the year at Monroe, 1917 to 2004. The record is -29.4 C (-20.9 F) in 1918, marked on the chart; the median year is -20.6 C (-5.1 F).

Coldest night (TNn) at Monroe by year
Year	Coldest night (TNn)
1917	-22.2 C (-8.0 F)
1918	-29.4 C (-20.9 F)
1919	-18.9 C (-2.0 F)
1920	-23.3 C (-9.9 F)
1921	-13.9 C (7.0 F)
1922	-21.1 C (-6.0 F)
1923	-17.8 C (0.0 F)
1924	-23.9 C (-11.0 F)
1925	-21.7 C (-7.1 F)
1926	-20.6 C (-5.1 F)
1927	-21.7 C (-7.1 F)
1928	-17.2 C (1.0 F)
1929	-25.6 C (-14.1 F)
1930	-23.9 C (-11.0 F)
1931	-14.4 C (6.1 F)
1932	-20.0 C (-4.0 F)
1933	-23.3 C (-9.9 F)
1934	-25.6 C (-14.1 F)
1935	-17.2 C (1.0 F)
1936	-22.2 C (-8.0 F)
1937	-15.6 C (3.9 F)
1938	-17.8 C (0.0 F)
1939	-15.6 C (3.9 F)
1940	-24.4 C (-11.9 F)
1941	-13.9 C (7.0 F)
1942	-21.7 C (-7.1 F)
1943	-22.2 C (-8.0 F)
1944	-18.9 C (-2.0 F)
1945	-20.0 C (-4.0 F)
1946	-18.9 C (-2.0 F)
1947	-17.8 C (0.0 F)
1948	-20.6 C (-5.1 F)
1949	-15.6 C (3.9 F)
1950	-20.0 C (-4.0 F)
1951	-22.2 C (-8.0 F)
1952	-13.3 C (8.1 F)
1953	-15.6 C (3.9 F)
1954	-15.6 C (3.9 F)
1955	-19.4 C (-2.9 F)
1956	-15.0 C (5.0 F)
1957	-21.1 C (-6.0 F)
1958	-21.1 C (-6.0 F)
1959	-21.7 C (-7.1 F)
1960	-22.2 C (-8.0 F)
1961	-20.6 C (-5.1 F)
1962	-21.1 C (-6.0 F)
1963	-26.7 C (-16.1 F)
1964	-15.6 C (3.9 F)
1965	-21.1 C (-6.0 F)
1966	-20.6 C (-5.1 F)
1967	-20.0 C (-4.0 F)
1968	-22.2 C (-8.0 F)
1969	-20.6 C (-5.1 F)
1970	-23.3 C (-9.9 F)
1971	-22.8 C (-9.0 F)
1972	-25.6 C (-14.1 F)
1973	-20.0 C (-4.0 F)
1974	-17.2 C (1.0 F)
1975	-20.6 C (-5.1 F)
1976	-21.1 C (-6.0 F)
1977	-25.0 C (-13.0 F)
1978	-18.3 C (-0.9 F)
1979	-23.9 C (-11.0 F)
1980	-20.0 C (-4.0 F)
1981	-22.8 C (-9.0 F)
1982	-26.1 C (-15.0 F)
1983	-23.9 C (-11.0 F)
1984	-27.2 C (-17.0 F)
1985	-26.1 C (-15.0 F)
1986	-18.9 C (-2.0 F)
1987	-20.6 C (-5.1 F)
1988	-19.4 C (-2.9 F)
1989	-24.4 C (-11.9 F)
1990	-15.6 C (3.9 F)
1991	-16.1 C (3.0 F)
1992	-18.9 C (-2.0 F)
1993	-18.3 C (-0.9 F)
1994	-27.8 C (-18.0 F)
1995	-18.3 C (-0.9 F)
1996	-21.1 C (-6.0 F)
1997	-20.0 C (-4.0 F)
1998	-12.8 C (9.0 F)
1999	-22.2 C (-8.0 F)
2000	-19.4 C (-2.9 F)
2001	-15.0 C (5.0 F)
2002	-14.4 C (6.1 F)
2003	-21.7 C (-7.1 F)
2004	n/a

Wettest day (Rx1day)

The wettest day of the year at Monroe, 1917 to 2004. The record is 107.2 mm (4.2 in) in 1987, marked on the chart; the median year is 48.3 mm (1.9 in).

Wettest day (Rx1day) at Monroe by year
Year	Wettest day (Rx1day)
1917	103.6 mm (4.1 in)
1918	52.6 mm (2.1 in)
1919	65.0 mm (2.6 in)
1920	45.7 mm (1.8 in)
1921	58.4 mm (2.3 in)
1922	51.1 mm (2.0 in)
1923	50.8 mm (2.0 in)
1924	33.5 mm (1.3 in)
1925	36.3 mm (1.4 in)
1926	53.3 mm (2.1 in)
1927	50.5 mm (2.0 in)
1928	38.1 mm (1.5 in)
1929	63.5 mm (2.5 in)
1930	41.9 mm (1.6 in)
1931	32.3 mm (1.3 in)
1932	45.2 mm (1.8 in)
1933	50.8 mm (2.0 in)
1934	30.5 mm (1.2 in)
1935	38.1 mm (1.5 in)
1936	49.8 mm (2.0 in)
1937	65.5 mm (2.6 in)
1938	38.6 mm (1.5 in)
1939	41.4 mm (1.6 in)
1940	44.7 mm (1.8 in)
1941	28.7 mm (1.1 in)
1942	26.2 mm (1.0 in)
1943	46.2 mm (1.8 in)
1944	69.6 mm (2.7 in)
1945	51.1 mm (2.0 in)
1946	27.4 mm (1.1 in)
1947	35.1 mm (1.4 in)
1948	65.3 mm (2.6 in)
1949	67.8 mm (2.7 in)
1950	51.6 mm (2.0 in)
1951	57.9 mm (2.3 in)
1952	62.5 mm (2.5 in)
1953	41.9 mm (1.6 in)
1954	48.0 mm (1.9 in)
1955	50.8 mm (2.0 in)
1956	57.2 mm (2.3 in)
1957	44.5 mm (1.8 in)
1958	33.5 mm (1.3 in)
1959	55.9 mm (2.2 in)
1960	39.1 mm (1.5 in)
1961	46.0 mm (1.8 in)
1962	37.6 mm (1.5 in)
1963	34.3 mm (1.4 in)
1964	53.8 mm (2.1 in)
1965	48.5 mm (1.9 in)
1966	52.8 mm (2.1 in)
1967	69.9 mm (2.8 in)
1968	64.0 mm (2.5 in)
1969	48.0 mm (1.9 in)
1970	30.7 mm (1.2 in)
1971	37.6 mm (1.5 in)
1972	29.7 mm (1.2 in)
1973	32.0 mm (1.3 in)
1974	35.6 mm (1.4 in)
1975	43.9 mm (1.7 in)
1976	57.4 mm (2.3 in)
1977	72.4 mm (2.9 in)
1978	50.0 mm (2.0 in)
1979	52.1 mm (2.1 in)
1980	55.9 mm (2.2 in)
1981	60.5 mm (2.4 in)
1982	54.6 mm (2.1 in)
1983	62.2 mm (2.4 in)
1984	33.8 mm (1.3 in)
1985	34.3 mm (1.4 in)
1986	63.2 mm (2.5 in)
1987	107.2 mm (4.2 in)
1988	42.2 mm (1.7 in)
1989	53.3 mm (2.1 in)
1990	97.3 mm (3.8 in)
1991	91.9 mm (3.6 in)
1992	44.5 mm (1.8 in)
1993	31.8 mm (1.3 in)
1994	52.1 mm (2.1 in)
1995	43.9 mm (1.7 in)
1996	51.6 mm (2.0 in)
1997	43.9 mm (1.7 in)
1998	51.6 mm (2.0 in)
1999	33.0 mm (1.3 in)
2000	55.9 mm (2.2 in)
2001	39.6 mm (1.6 in)
2002	36.1 mm (1.4 in)
2003	25.4 mm (1.0 in)
2004	2.8 mm (0.11 in)

Wettest five days (Rx5day)

The wettest five days of the year at Monroe, 1917 to 2004. The record is 126.8 mm (5.0 in) in 1987, marked on the chart; the median year is 73.6 mm (2.9 in).

Wettest five days (Rx5day) at Monroe by year
Year	Wettest five days (Rx5day)
1917	118.9 mm (4.7 in)
1918	61.4 mm (2.4 in)
1919	75.2 mm (3.0 in)
1920	88.9 mm (3.5 in)
1921	73.1 mm (2.9 in)
1922	61.7 mm (2.4 in)
1923	65.0 mm (2.6 in)
1924	58.4 mm (2.3 in)
1925	55.4 mm (2.2 in)
1926	65.4 mm (2.6 in)
1927	106.9 mm (4.2 in)
1928	58.9 mm (2.3 in)
1929	98.5 mm (3.9 in)
1930	77.8 mm (3.1 in)
1931	48.2 mm (1.9 in)
1932	72.4 mm (2.9 in)
1933	70.9 mm (2.8 in)
1934	41.4 mm (1.6 in)
1935	67.1 mm (2.6 in)
1936	74.7 mm (2.9 in)
1937	120.9 mm (4.8 in)
1938	64.5 mm (2.5 in)
1939	56.9 mm (2.2 in)
1940	44.7 mm (1.8 in)
1941	71.1 mm (2.8 in)
1942	48.5 mm (1.9 in)
1943	72.9 mm (2.9 in)
1944	100.3 mm (3.9 in)
1945	119.2 mm (4.7 in)
1946	34.5 mm (1.4 in)
1947	66.6 mm (2.6 in)
1948	88.7 mm (3.5 in)
1949	76.8 mm (3.0 in)
1950	73.4 mm (2.9 in)
1951	81.6 mm (3.2 in)
1952	81.5 mm (3.2 in)
1953	44.2 mm (1.7 in)
1954	67.5 mm (2.7 in)
1955	103.9 mm (4.1 in)
1956	82.1 mm (3.2 in)
1957	74.1 mm (2.9 in)
1958	55.4 mm (2.2 in)
1959	75.4 mm (3.0 in)
1960	74.0 mm (2.9 in)
1961	88.4 mm (3.5 in)
1962	42.2 mm (1.7 in)
1963	50.3 mm (2.0 in)
1964	58.3 mm (2.3 in)
1965	85.8 mm (3.4 in)
1966	97.8 mm (3.9 in)
1967	75.0 mm (3.0 in)
1968	98.7 mm (3.9 in)
1969	73.7 mm (2.9 in)
1970	70.6 mm (2.8 in)
1971	43.0 mm (1.7 in)
1972	42.2 mm (1.7 in)
1973	70.1 mm (2.8 in)
1974	71.2 mm (2.8 in)
1975	100.0 mm (3.9 in)
1976	103.2 mm (4.1 in)
1977	113.0 mm (4.4 in)
1978	50.0 mm (2.0 in)
1979	84.6 mm (3.3 in)
1980	78.8 mm (3.1 in)
1981	66.9 mm (2.6 in)
1982	100.8 mm (4.0 in)
1983	96.3 mm (3.8 in)
1984	50.3 mm (2.0 in)
1985	77.8 mm (3.1 in)
1986	116.3 mm (4.6 in)
1987	126.8 mm (5.0 in)
1988	57.2 mm (2.3 in)
1989	121.2 mm (4.8 in)
1990	97.3 mm (3.8 in)
1991	95.8 mm (3.8 in)
1992	65.5 mm (2.6 in)
1993	65.3 mm (2.6 in)
1994	109.3 mm (4.3 in)
1995	115.5 mm (4.5 in)
1996	72.8 mm (2.9 in)
1997	75.7 mm (3.0 in)
1998	96.7 mm (3.8 in)
1999	53.3 mm (2.1 in)
2000	83.4 mm (3.3 in)
2001	64.8 mm (2.6 in)
2002	75.0 mm (3.0 in)
2003	25.4 mm (1.0 in)
2004	2.8 mm (0.11 in)

Longest dry spell (CDD)

The longest dry spell of the year at Monroe, 1917 to 2004. The record is 44 days in 1969, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at Monroe by year
Year	Longest dry spell (CDD)
1917	19 days
1918	16 days
1919	21 days
1920	23 days
1921	29 days
1922	25 days
1923	16 days
1924	36 days
1925	23 days
1926	13 days
1927	20 days
1928	16 days
1929	16 days
1930	25 days
1931	14 days
1932	19 days
1933	18 days
1934	20 days
1935	14 days
1936	20 days
1937	19 days
1938	15 days
1939	18 days
1940	16 days
1941	16 days
1942	21 days
1943	17 days
1944	27 days
1945	14 days
1946	14 days
1947	21 days
1948	18 days
1949	22 days
1950	12 days
1951	15 days
1952	18 days
1953	25 days
1954	23 days
1955	20 days
1956	36 days
1957	23 days
1958	23 days
1959	17 days
1960	16 days
1961	30 days
1962	14 days
1963	32 days
1964	17 days
1965	15 days
1966	18 days
1967	40 days
1968	24 days
1969	44 days
1970	15 days
1971	17 days
1972	16 days
1973	18 days
1974	14 days
1975	19 days
1976	20 days
1977	16 days
1978	25 days
1979	17 days
1980	16 days
1981	30 days
1982	17 days
1983	26 days
1984	18 days
1985	17 days
1986	13 days
1987	29 days
1988	20 days
1989	24 days
1990	17 days
1991	14 days
1992	13 days
1993	14 days
1994	24 days
1995	27 days
1996	24 days
1997	13 days
1998	19 days
1999	21 days
2000	14 days
2001	13 days
2002	16 days
2003	15 days
2004	5 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

77 years with a frost

Across 77 years with a frost, the median last spring frost at Monroe falls on 27 April and the median first autumn frost on 18 October, which leaves a median of 176 days between them.

In 1967 to 2000 the median growing season was 182 days. That is 15 days more than in 1918 to 1949.

Fitted over all years, the growing season changes by +3.4 days per decade at this station.

Frost dates and growing season at Monroe
Measure	Median, all years	Earliest period (1918 to 1949)	Recent period (1967 to 2000)	Recent against earliest	Fitted trend
Last spring frost	27 April	1 May	25 April	6 days earlier	-2.0 days per decade
First autumn frost	18 October	15 October	21 October	6 days later	+1.4 days per decade
Growing days	176 days	167 days	182 days	15 days more	+3.4 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

72 years, 1918 to 2002

A day with at least 48.2 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 96.1 mm (3.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Monroe: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	48.2 mm (1.9 in)
5 years	61.1 mm (2.4 in)
10 years	69.6 mm (2.7 in)
25 years	80.3 mm (3.2 in)
50 years	88.3 mm (3.5 in)
100 years	96.1 mm (3.8 in)	Longer than the 72 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, 72 years of values from 1918 to 2002.

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: 107.2 mm (4.2 in) in 1987; 97.3 mm (3.8 in) in 1990; 91.9 mm (3.6 in) in 1991.

Station Changes

2 suspected

2 changes were suspected in the annual mean temperature of Monroe, at 1950 and 1967. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1950 ran 0.5 C (0.9 F) higher than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1967 ran 0.3 C (0.5 F) lower than in the years before (possible change).

Suspected changes in the annual mean temperature at Monroe, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1950	+0.5	+0.9	possible	5
1967	-0.3	-0.5	possible	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.

Download the Data

Data for Monroe standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Monroe 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 2026-10-17 (17 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).