Marengo Weather Records (USC00125322)

Record envelope, standing records and threshold days for Marengo (USC00125322), Indiana, United States, with 122 years of record.

Key Facts for Marengo

Marengo (USC00125322) is a weather station in Indiana, United States at 38.38 latitude and -86.34 longitude, 177 m (580 ft) above sea level.
The station reports from 1893 to 2014, 122 years of record.
1,464 records set at Marengo still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Marengo set a daily record precipitation of 53.3 mm (2.1 in) on 18 November 2013.

About the Station

Location: Indiana, United States, 38.38 latitude, -86.34 longitude.
Elevation: 177 m (580 ft).
Period of record: 1893 to 2014, 122 years.
Eligible elements: tmax, tmin, prcp, snow.

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 Marengo. 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 Marengo, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	25.6 C (78.1 F)	-33.3 C (-27.9 F)	n/a	n/a
Feb	26.1 C (79.0 F)	-33.3 C (-27.9 F)	n/a	n/a
Mar	34.4 C (93.9 F)	-19.4 C (-2.9 F)	n/a	n/a
Apr	33.3 C (91.9 F)	-10.0 C (14.0 F)	n/a	n/a
May	35.6 C (96.1 F)	-3.9 C (25.0 F)	n/a	n/a
Jun	41.1 C (106.0 F)	1.1 C (34.0 F)	n/a	n/a
Jul	43.3 C (109.9 F)	5.0 C (41.0 F)	n/a	n/a
Aug	42.2 C (108.0 F)	3.3 C (37.9 F)	n/a	n/a
Sep	39.4 C (102.9 F)	-5.6 C (21.9 F)	n/a	n/a
Oct	33.3 C (91.9 F)	-12.8 C (9.0 F)	n/a	n/a
Nov	31.1 C (88.0 F)	-16.7 C (1.9 F)	n/a	n/a
Dec	22.2 C (72.0 F)	-34.4 C (-29.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Marengo still stand. 1930 holds the most, with 53.

Standing records at Marengo by the year they were set
Year set	Standing records
1896	44
1897	27
1898	31
1899	40
1900	28
1901	36
1902	23
1903	33
1904	20
1905	10
1906	26
1907	31
1908	13
1909	13
1910	16
1911	26
1912	22
1913	39
1914	21
1915	27
1916	36
1917	44
1918	44
1919	18
1920	26
1921	29
1922	19
1923	23
1924	21
1925	38
1926	25
1927	28
1928	30
1929	39
1930	53
1931	25
1932	19
1933	27
1934	21
1935	26
1936	53
1937	24
1938	21
1939	27
1940	42
1941	17
1942	30
1943	29
1944	24
1963	8
1964	22
1965	19
1966	9
1967	14
1968	3
1969	5

All-Time Record Progression

5 new records

5 all-time records were set at Marengo between 6 August 1930 and 1 February 1966. Each dot is a new record.

When Marengo set new all-time records
Date	Kind	Detail
1930-08-06	Record high maximum temperature	Record high maximum temperature 41.7 C (107.1 F)
1930-08-08	Record high maximum temperature	Record high maximum temperature 42.2 C (108.0 F)
1936-07-13	Record high maximum temperature	Record high maximum temperature 42.8 C (109.0 F)
1936-07-14	Record high maximum temperature	Record high maximum temperature 43.3 C (109.9 F)
1966-02-01	Record daily snowfall	Record daily snowfall 31.8 cm (12.5 in)

Wettest Day of Each Month

Nov: 177.8 mm (7.0 in)

The wettest day on record for each calendar month at Marengo. The most was 177.8 mm (7.0 in) on 24 November 1895.

Record daily precipitation for each month at Marengo
Month	Record daily precipitation (mm)	Date
Jan	139.7 mm (5.5 in)	6 January 1895
Feb	80.5 mm (3.2 in)	23 February 1909
Mar	125.7 mm (4.9 in)	9 March 1964
Apr	127.0 mm (5.0 in)	11 April 1893
May	114.3 mm (4.5 in)	28 May 1893
Jun	80.5 mm (3.2 in)	26 June 1898
Jul	96.5 mm (3.8 in)	18 July 1938
Aug	83.8 mm (3.3 in)	24 August 1928
Sep	74.7 mm (2.9 in)	15 September 1965
Oct	101.6 mm (4.0 in)	5 October 1910
Nov	177.8 mm (7.0 in)	24 November 1895
Dec	94.0 mm (3.7 in)	31 December 1932

Period of Record Coverage

1896 to 1969

56 years of record at Marengo, 1896 to 1969. 14 years have data for under 90 percent of days and are left out of rankings: 1896, 1913, 1914, 1916, 1917, 1920, 1922, 1923 and others.

Days with data per year at Marengo
Year	Days with data	Share of year	Complete
1896	286	78%	No
1897	364	100%	Yes
1898	364	100%	Yes
1899	361	99%	Yes
1900	364	100%	Yes
1901	357	98%	Yes
1902	364	100%	Yes
1903	365	100%	Yes
1904	364	99%	Yes
1905	361	99%	Yes
1906	359	98%	Yes
1907	355	97%	Yes
1908	360	98%	Yes
1909	333	91%	Yes
1910	340	93%	Yes
1911	364	100%	Yes
1912	348	95%	Yes
1913	302	83%	No
1914	319	87%	No
1915	330	90%	Yes
1916	319	87%	No
1917	267	73%	No
1918	349	96%	Yes
1919	356	98%	Yes
1920	296	81%	No
1921	333	91%	Yes
1922	311	85%	No
1923	314	86%	No
1924	330	90%	Yes
1925	338	93%	Yes
1926	339	93%	Yes
1927	348	95%	Yes
1928	356	97%	Yes
1929	351	96%	Yes
1930	349	96%	Yes
1931	353	97%	Yes
1932	356	97%	Yes
1933	349	96%	Yes
1934	357	98%	Yes
1935	359	98%	Yes
1936	357	98%	Yes
1937	359	98%	Yes
1938	358	98%	Yes
1939	362	99%	Yes
1940	359	98%	Yes
1941	242	66%	No
1942	362	99%	Yes
1943	359	98%	Yes
1944	323	88%	No
1963	153	42%	No
1964	366	100%	Yes
1965	363	99%	Yes
1966	344	94%	Yes
1967	320	88%	No
1968	221	60%	No
1969	114	31%	No

Latest Records

Latest records at Marengo
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 November 2013	Marengo, US	daily rain	53.3 mm (2.1 in)	16.5 mm (0.6 in)	92 years	46 of 100 (Notable)
30 October 2013	Marengo, US	daily rain	52.3 mm (2.1 in)	37.1 mm (1.5 in)	94 years	64 of 100 (Major)
11 September 2013	Marengo, US	daily rain	52.3 mm (2.1 in)	6.1 mm (0.24 in)	108 years	44 of 100 (Notable)
27 June 2013	Marengo, US	daily rain	77.5 mm (3.1 in)	41.2 mm (1.6 in)	103 years	71 of 100 (Major)
18 April 1969	Marengo, US	daily rain	27.4 mm (1.1 in)	2.0 mm (0.08 in)	74 years	30 of 100 (Routine)
2 April 1969	Marengo, US	daily rain	20.3 mm (0.8 in)	3.8 mm (0.15 in)	51 years	20 of 100 (Routine)
31 March 1969	Marengo, US	daily low min	-11.1 C (12.0 F)	1.7 C (3.1 F)	46 years	22 of 100 (Routine)
22 March 1969	Marengo, US	daily low min	-7.2 C (19.0 F)	0.5 C (0.9 F)	28 years	15 of 100 (Routine)
11 March 1969	Marengo, US	daily low max	0.0 C (32.0 F)	0.6 C (1.1 F)	44 years	20 of 100 (Routine)
30 January 1969	Marengo, US	daily high min	8.9 C (48.0 F)	5.6 C (10.1 F)	45 years	27 of 100 (Routine)
29 January 1969	Marengo, US	daily high min	9.4 C (48.9 F)	2.2 C (4.0 F)	55 years	25 of 100 (Routine)
28 January 1969	Marengo, US	daily rain	44.5 mm (1.8 in)	31.3 mm (1.2 in)	57 years	44 of 100 (Notable)
17 January 1969	Marengo, US	daily rain	43.9 mm (1.7 in)	4.5 mm (0.18 in)	71 years	30 of 100 (Routine)
28 December 1968	Marengo, US	daily rain	19.8 mm (0.8 in)	1.3 mm (0.05 in)	25 years	15 of 100 (Routine)
25 December 1968	Marengo, US	daily low max	-3.9 C (25.0 F)	1.7 C (3.1 F)	44 years	22 of 100 (Routine)
3 December 1968	Marengo, US	daily rain	20.1 mm (0.8 in)	1.8 mm (0.07 in)	4 years	9 of 100 (Routine)
28 November 1968	Marengo, US	daily rain	31.8 mm (1.3 in)	10.2 mm (0.4 in)	50 years	28 of 100 (Routine)
5 September 1968	Marengo, US	daily rain	43.2 mm (1.7 in)	15.3 mm (0.6 in)	42 years	30 of 100 (Routine)
26 May 1968	Marengo, US	daily rain	44.5 mm (1.8 in)	16.6 mm (0.7 in)	35 years	29 of 100 (Routine)
15 May 1968	Marengo, US	daily high min	18.3 C (64.9 F)	2.7 C (4.9 F)	55 years	28 of 100 (Routine)

Climate Trend

35 complete years, 1897 to 1965

One stripe for each of 35 complete years at Marengo, 1897 to 1965. Blue stripes are years cooler than the station's own mean of 12.6 C (54.7 F); red stripes are warmer. The coolest year was 1940, at 11.0 C (51.9 F), and the warmest was 1921, at 14.1 C (57.4 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Marengo as warming stripes, 1897 to 1965
Year	Annual mean temperature	Difference from the station mean
1897	13.2 C	+0.63 C
1898	13.3 C	+0.72 C
1899	12.3 C	-0.28 C
1900	13.3 C	+0.71 C
1901	12.0 C	-0.64 C
1902	12.4 C	-0.19 C
1903	12.6 C	+0.02 C
1904	11.8 C	-0.78 C
1906	12.6 C	+0.01 C
1907	12.7 C	+0.10 C
1908	13.7 C	+1.15 C
1910	11.5 C	-1.07 C
1911	13.2 C	+0.63 C
1918	11.9 C	-0.67 C
1919	12.7 C	+0.08 C
1921	14.1 C	+1.54 C
1925	12.0 C	-0.55 C
1927	12.9 C	+0.34 C
1928	12.0 C	-0.63 C
1929	11.8 C	-0.76 C
1930	12.5 C	-0.05 C
1931	13.0 C	+0.39 C
1932	12.5 C	-0.06 C
1933	13.2 C	+0.56 C
1934	12.7 C	+0.09 C
1935	12.3 C	-0.31 C
1936	12.8 C	+0.17 C
1937	12.0 C	-0.58 C
1938	13.4 C	+0.76 C
1939	12.9 C	+0.34 C
1940	11.0 C	-1.55 C
1942	12.9 C	+0.29 C
1943	12.3 C	-0.28 C
1964	12.6 C	0.00 C
1965	12.6 C	+0.04 C

The fitted trend in annual mean temperature here over 1897 to 1965 is -0.04 C (-0.16 to 0.09) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.3 to 0.2) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Marengo
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.04 C (-0.16 to 0.09) per decade	-0.1 F (-0.3 to 0.2) per decade	1897 to 1965	35	Not clearly different from zero
Mean daily maximum	0.2 C (0.1 to 0.4) per decade	0.4 F (0.1 to 0.7) per decade	1897 to 1965	35	Rise
Mean daily minimum	-0.3 C (-0.4 to -0.1) per decade	-0.5 F (-0.8 to -0.3) per decade	1897 to 1965	35	Fall

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

1893 to 2014

Yearly extremes at Marengo: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.3 C (109.9 F)	1936	37.0 C (98.5 F)	56
Coldest night (TNn)	-34.4 C (-29.9 F)	1917	-22.8 C (-9.0 F)	56
Wettest day (Rx1day)	177.8 mm (7.0 in)	1895	63.5 mm (2.5 in)	63
Wettest five days (Rx5day)	207.0 mm (8.1 in)	1937	97.7 mm (3.8 in)	63
Longest dry spell (CDD)	43 days	1966	20 days	63

Hottest day (TXx)

The hottest day of the year at Marengo, 1893 to 2014. The record is 43.3 C (109.9 F) in 1936, marked on the chart; the median year is 37.0 C (98.5 F).

Hottest day (TXx) at Marengo by year
Year	Hottest day (TXx)
1893	n/a
1894	n/a
1895	n/a
1896	36.7 C (98.1 F)
1897	37.8 C (100.0 F)
1898	36.7 C (98.1 F)
1899	37.2 C (99.0 F)
1900	35.6 C (96.1 F)
1901	41.1 C (106.0 F)
1902	35.6 C (96.1 F)
1903	37.8 C (100.0 F)
1904	35.6 C (96.1 F)
1905	35.0 C (95.0 F)
1906	35.0 C (95.0 F)
1907	38.9 C (102.0 F)
1908	36.7 C (98.1 F)
1909	35.0 C (95.0 F)
1910	33.9 C (93.0 F)
1911	38.3 C (100.9 F)
1912	36.7 C (98.1 F)
1913	40.0 C (104.0 F)
1914	38.9 C (102.0 F)
1915	35.6 C (96.1 F)
1916	37.2 C (99.0 F)
1917	35.6 C (96.1 F)
1918	37.8 C (100.0 F)
1919	36.1 C (97.0 F)
1920	33.9 C (93.0 F)
1921	38.9 C (102.0 F)
1922	36.7 C (98.1 F)
1923	35.6 C (96.1 F)
1924	36.1 C (97.0 F)
1925	38.3 C (100.9 F)
1926	38.9 C (102.0 F)
1927	36.7 C (98.1 F)
1928	36.7 C (98.1 F)
1929	37.2 C (99.0 F)
1930	42.2 C (108.0 F)
1931	38.3 C (100.9 F)
1932	37.2 C (99.0 F)
1933	38.9 C (102.0 F)
1934	39.4 C (102.9 F)
1935	36.7 C (98.1 F)
1936	43.3 C (109.9 F)
1937	36.1 C (97.0 F)
1938	35.0 C (95.0 F)
1939	39.4 C (102.9 F)
1940	38.9 C (102.0 F)
1941	37.8 C (100.0 F)
1942	37.2 C (99.0 F)
1943	38.9 C (102.0 F)
1944	38.3 C (100.9 F)
1963	36.1 C (97.0 F)
1964	41.1 C (106.0 F)
1965	36.7 C (98.1 F)
1966	42.8 C (109.0 F)
1967	35.0 C (95.0 F)
1968	35.0 C (95.0 F)
1969	27.8 C (82.0 F)
2011	n/a
2012	n/a
2013	n/a
2014	n/a

Coldest night (TNn)

The coldest night of the year at Marengo, 1893 to 2014. The record is -34.4 C (-29.9 F) in 1917, marked on the chart; the median year is -22.8 C (-9.0 F).

Coldest night (TNn) at Marengo by year
Year	Coldest night (TNn)
1893	n/a
1894	n/a
1895	n/a
1896	-15.6 C (3.9 F)
1897	-20.6 C (-5.1 F)
1898	-23.9 C (-11.0 F)
1899	-33.3 C (-27.9 F)
1900	-22.8 C (-9.0 F)
1901	-28.3 C (-18.9 F)
1902	-18.3 C (-0.9 F)
1903	-27.2 C (-17.0 F)
1904	-20.6 C (-5.1 F)
1905	-20.0 C (-4.0 F)
1906	-27.2 C (-17.0 F)
1907	-21.1 C (-6.0 F)
1908	-14.4 C (6.1 F)
1909	-19.4 C (-2.9 F)
1910	-28.9 C (-20.0 F)
1911	-17.8 C (0.0 F)
1912	-33.3 C (-27.9 F)
1913	-18.9 C (-2.0 F)
1914	-22.8 C (-9.0 F)
1915	-20.6 C (-5.1 F)
1916	-25.6 C (-14.1 F)
1917	-34.4 C (-29.9 F)
1918	-32.8 C (-27.0 F)
1919	-15.6 C (3.9 F)
1920	-22.8 C (-9.0 F)
1921	-11.7 C (10.9 F)
1922	-18.9 C (-2.0 F)
1923	-15.6 C (3.9 F)
1924	-17.2 C (1.0 F)
1925	-22.8 C (-9.0 F)
1926	-15.6 C (3.9 F)
1927	-21.7 C (-7.1 F)
1928	-23.3 C (-9.9 F)
1929	-26.1 C (-15.0 F)
1930	-31.1 C (-24.0 F)
1931	-19.4 C (-2.9 F)
1932	-22.8 C (-9.0 F)
1933	-22.8 C (-9.0 F)
1934	-17.2 C (1.0 F)
1935	-17.8 C (0.0 F)
1936	-31.1 C (-24.0 F)
1937	-15.6 C (3.9 F)
1938	-23.3 C (-9.9 F)
1939	-25.6 C (-14.1 F)
1940	-29.4 C (-20.9 F)
1941	-15.6 C (3.9 F)
1942	-29.4 C (-20.9 F)
1943	-23.3 C (-9.9 F)
1944	-17.8 C (0.0 F)
1963	-26.1 C (-15.0 F)
1964	-25.6 C (-14.1 F)
1965	-26.1 C (-15.0 F)
1966	-23.9 C (-11.0 F)
1967	-23.9 C (-11.0 F)
1968	-12.2 C (10.0 F)
1969	-18.9 C (-2.0 F)
2011	n/a
2012	n/a
2013	n/a
2014	n/a

Wettest day (Rx1day)

The wettest day of the year at Marengo, 1893 to 2014. The record is 177.8 mm (7.0 in) in 1895, marked on the chart; the median year is 63.5 mm (2.5 in).

Wettest day (Rx1day) at Marengo by year
Year	Wettest day (Rx1day)
1893	127.0 mm (5.0 in)
1894	76.2 mm (3.0 in)
1895	177.8 mm (7.0 in)
1896	54.9 mm (2.2 in)
1897	63.5 mm (2.5 in)
1898	80.5 mm (3.2 in)
1899	55.4 mm (2.2 in)
1900	67.3 mm (2.6 in)
1901	55.6 mm (2.2 in)
1902	71.1 mm (2.8 in)
1903	50.8 mm (2.0 in)
1904	68.1 mm (2.7 in)
1905	73.2 mm (2.9 in)
1906	54.6 mm (2.1 in)
1907	78.0 mm (3.1 in)
1908	85.3 mm (3.4 in)
1909	80.5 mm (3.2 in)
1910	101.6 mm (4.0 in)
1911	54.9 mm (2.2 in)
1912	104.9 mm (4.1 in)
1913	61.0 mm (2.4 in)
1914	73.7 mm (2.9 in)
1915	62.7 mm (2.5 in)
1916	49.5 mm (1.9 in)
1917	63.5 mm (2.5 in)
1918	69.9 mm (2.8 in)
1919	53.3 mm (2.1 in)
1920	50.8 mm (2.0 in)
1921	53.3 mm (2.1 in)
1922	50.8 mm (2.0 in)
1923	69.9 mm (2.8 in)
1924	73.7 mm (2.9 in)
1925	72.4 mm (2.9 in)
1926	76.2 mm (3.0 in)
1927	78.2 mm (3.1 in)
1928	83.8 mm (3.3 in)
1929	52.1 mm (2.1 in)
1930	38.1 mm (1.5 in)
1931	62.2 mm (2.4 in)
1932	94.0 mm (3.7 in)
1933	50.8 mm (2.0 in)
1934	33.5 mm (1.3 in)
1935	106.7 mm (4.2 in)
1936	55.9 mm (2.2 in)
1937	85.1 mm (3.4 in)
1938	96.5 mm (3.8 in)
1939	54.9 mm (2.2 in)
1940	50.0 mm (2.0 in)
1941	50.0 mm (2.0 in)
1942	64.0 mm (2.5 in)
1943	76.2 mm (3.0 in)
1944	46.5 mm (1.8 in)
1963	41.7 mm (1.6 in)
1964	125.7 mm (4.9 in)
1965	74.7 mm (2.9 in)
1966	50.8 mm (2.0 in)
1967	54.9 mm (2.2 in)
1968	44.5 mm (1.8 in)
1969	44.5 mm (1.8 in)
2011	11.2 mm (0.4 in)
2012	42.2 mm (1.7 in)
2013	77.5 mm (3.1 in)
2014	17.8 mm (0.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Marengo, 1893 to 2014. The record is 207.0 mm (8.1 in) in 1937, marked on the chart; the median year is 97.7 mm (3.8 in).

Wettest five days (Rx5day) at Marengo by year
Year	Wettest five days (Rx5day)
1893	177.8 mm (7.0 in)
1894	114.3 mm (4.5 in)
1895	180.3 mm (7.1 in)
1896	94.8 mm (3.7 in)
1897	86.0 mm (3.4 in)
1898	107.9 mm (4.2 in)
1899	79.0 mm (3.1 in)
1900	72.6 mm (2.9 in)
1901	100.3 mm (3.9 in)
1902	131.3 mm (5.2 in)
1903	90.6 mm (3.6 in)
1904	92.7 mm (3.6 in)
1905	105.7 mm (4.2 in)
1906	97.0 mm (3.8 in)
1907	99.5 mm (3.9 in)
1908	111.0 mm (4.4 in)
1909	90.7 mm (3.6 in)
1910	134.6 mm (5.3 in)
1911	94.5 mm (3.7 in)
1912	110.0 mm (4.3 in)
1913	97.1 mm (3.8 in)
1914	91.0 mm (3.6 in)
1915	83.0 mm (3.3 in)
1916	68.6 mm (2.7 in)
1917	96.5 mm (3.8 in)
1918	128.3 mm (5.1 in)
1919	97.9 mm (3.9 in)
1920	85.1 mm (3.4 in)
1921	123.9 mm (4.9 in)
1922	88.1 mm (3.5 in)
1923	90.0 mm (3.5 in)
1924	104.2 mm (4.1 in)
1925	86.4 mm (3.4 in)
1926	107.1 mm (4.2 in)
1927	145.6 mm (5.7 in)
1928	109.3 mm (4.3 in)
1929	113.1 mm (4.5 in)
1930	94.0 mm (3.7 in)
1931	62.2 mm (2.4 in)
1932	105.5 mm (4.2 in)
1933	118.2 mm (4.7 in)
1934	62.3 mm (2.5 in)
1935	132.1 mm (5.2 in)
1936	127.0 mm (5.0 in)
1937	207.0 mm (8.1 in)
1938	106.7 mm (4.2 in)
1939	118.2 mm (4.7 in)
1940	97.7 mm (3.8 in)
1941	89.6 mm (3.5 in)
1942	88.9 mm (3.5 in)
1943	102.9 mm (4.1 in)
1944	82.1 mm (3.2 in)
1963	44.2 mm (1.7 in)
1964	202.4 mm (8.0 in)
1965	154.2 mm (6.1 in)
1966	128.4 mm (5.1 in)
1967	54.9 mm (2.2 in)
1968	85.2 mm (3.4 in)
1969	106.4 mm (4.2 in)
2011	22.4 mm (0.9 in)
2012	68.2 mm (2.7 in)
2013	97.6 mm (3.8 in)
2014	5.6 mm (0.22 in)

Longest dry spell (CDD)

The longest dry spell of the year at Marengo, 1893 to 2014. The record is 43 days in 1966, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Marengo by year
Year	Longest dry spell (CDD)
1893	15 days
1894	23 days
1895	10 days
1896	17 days
1897	28 days
1898	16 days
1899	23 days
1900	16 days
1901	26 days
1902	13 days
1903	25 days
1904	22 days
1905	12 days
1906	12 days
1907	18 days
1908	33 days
1909	13 days
1910	14 days
1911	16 days
1912	17 days
1913	16 days
1914	18 days
1915	24 days
1916	19 days
1917	14 days
1918	16 days
1919	20 days
1920	27 days
1921	19 days
1922	16 days
1923	26 days
1924	24 days
1925	23 days
1926	16 days
1927	21 days
1928	15 days
1929	22 days
1930	27 days
1931	18 days
1932	20 days
1933	24 days
1934	27 days
1935	19 days
1936	23 days
1937	24 days
1938	30 days
1939	23 days
1940	29 days
1941	17 days
1942	23 days
1943	27 days
1944	33 days
1963	27 days
1964	19 days
1965	20 days
1966	43 days
1967	26 days
1968	23 days
1969	15 days
2011	9 days
2012	15 days
2013	13 days
2014	8 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

35 years with a frost

Across 35 years with a frost, the median last spring frost at Marengo falls on 28 April and the median first autumn frost on 8 October, which leaves a median of 161 days between them.

Fitted over all years, the growing season changes by -5.4 days per decade at this station.

Frost dates and growing season at Marengo
Measure	Median, all years	Earliest period	Recent period (1902 to 1965)	Recent against earliest	Fitted trend
Last spring frost	28 April	n/a	1 May	n/a	+1.3 days per decade
First autumn frost	8 October	n/a	7 October	n/a	-4.1 days per decade
Growing days	161 days	n/a	158 days	n/a	-5.4 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

39 years, 1894 to 1966

A day with at least 65.4 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 127.5 mm (5.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Marengo: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	65.4 mm (2.6 in)
5 years	82.7 mm (3.3 in)
10 years	93.8 mm (3.7 in)
25 years	107.6 mm (4.2 in)
50 years	117.7 mm (4.6 in)	Longer than the 39 years of record
100 years	127.5 mm (5.0 in)	Longer than the 39 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, 39 years of values from 1894 to 1966.

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: 125.7 mm (4.9 in) in 1964; 106.7 mm (4.2 in) in 1935; 101.6 mm (4.0 in) in 1910.

Download the Data

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