Mascoutah Weather Records (USC00115405)

Record envelope, standing records and threshold days for Mascoutah (USC00115405), Illinois, United States, with 62 years of record.

Key Facts for Mascoutah

Mascoutah (USC00115405) is a weather station in Illinois, United States at 38.48 latitude and -89.80 longitude, 131 m (430 ft) above sea level.
The station reports from 1893 to 1954, 62 years of record.
1,464 records set at Mascoutah still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Mascoutah set a daily record snowfall of 2.5 cm (1.0 in) on 17 April 1953.

About the Station

Location: Illinois, United States, 38.48 latitude, -89.80 longitude.
Elevation: 131 m (430 ft).
Period of record: 1893 to 1954, 62 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 Mascoutah. 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 Mascoutah, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	23.9 C (75.0 F)	-28.9 C (-20.0 F)	n/a	n/a
Feb	27.8 C (82.0 F)	-28.9 C (-20.0 F)	n/a	n/a
Mar	33.9 C (93.0 F)	-17.2 C (1.0 F)	n/a	n/a
Apr	33.9 C (93.0 F)	-6.1 C (21.0 F)	n/a	n/a
May	37.8 C (100.0 F)	-3.3 C (26.1 F)	n/a	n/a
Jun	41.1 C (106.0 F)	3.3 C (37.9 F)	n/a	n/a
Jul	45.0 C (113.0 F)	8.3 C (46.9 F)	n/a	n/a
Aug	43.3 C (109.9 F)	6.7 C (44.1 F)	n/a	n/a
Sep	40.6 C (105.1 F)	-4.4 C (24.1 F)	n/a	n/a
Oct	33.9 C (93.0 F)	-6.7 C (19.9 F)	n/a	n/a
Nov	28.9 C (84.0 F)	-22.2 C (-8.0 F)	n/a	n/a
Dec	22.8 C (73.0 F)	-26.1 C (-15.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Mascoutah still stand. 1911 holds the most, with 62.

Standing records at Mascoutah by the year they were set
Year set	Standing records
1898	25
1899	48
1900	14
1901	31
1902	30
1903	42
1904	29
1905	39
1906	38
1907	20
1908	32
1909	29
1910	34
1911	62
1912	25
1913	40
1914	25
1915	28
1916	30
1917	41
1918	25
1919	16
1920	17
1921	19
1922	25
1923	22
1924	27
1925	43
1926	17
1927	25
1928	26
1929	27
1930	42
1931	32
1932	27
1933	32
1934	33
1935	17
1936	61
1937	22
1938	22
1939	29
1940	35
1941	23
1942	21
1943	27
1944	19
1945	25
1946	23
1947	16
1948	7

All-Time Record Progression

5 new records

5 all-time records were set at Mascoutah between 4 August 1930 and 16 August 1946. Each dot is a new record.

When Mascoutah set new all-time records
Date	Kind	Detail
1930-08-04	Record high minimum temperature	Record high minimum temperature 28.3 C (82.9 F)
1934-07-20	Record high maximum temperature	Record high maximum temperature 43.3 C (109.9 F)
1934-07-24	Record high maximum temperature	Record high maximum temperature 44.4 C (111.9 F)
1934-07-25	Record high maximum temperature	Record high maximum temperature 45.0 C (113.0 F)
1946-08-16	Record daily precipitation	Record daily precipitation 209.3 mm (8.2 in)

Wettest Day of Each Month

Aug: 209.3 mm (8.2 in)

The wettest day on record for each calendar month at Mascoutah. The most was 209.3 mm (8.2 in) on 16 August 1946.

Record daily precipitation for each month at Mascoutah
Month	Record daily precipitation (mm)	Date
Jan	97.3 mm (3.8 in)	12 January 1916
Feb	61.5 mm (2.4 in)	13 February 1950
Mar	100.3 mm (3.9 in)	24 March 1904
Apr	76.2 mm (3.0 in)	26 April 1912
May	114.3 mm (4.5 in)	27 May 1896
Jun	101.6 mm (4.0 in)	2 June 1904
Jul	89.2 mm (3.5 in)	11 July 1909
Aug	209.3 mm (8.2 in)	16 August 1946
Sep	153.4 mm (6.0 in)	8 September 1917
Oct	107.2 mm (4.2 in)	24 October 1919
Nov	71.1 mm (2.8 in)	2 November 1936
Dec	95.5 mm (3.8 in)	18 December 1924

Period of Record Coverage

1898 to 1948

51 years of record at Mascoutah, 1898 to 1948. 5 years have data for under 90 percent of days and are left out of rankings: 1900, 1902, 1906, 1907, 1948.

Days with data per year at Mascoutah
Year	Days with data	Share of year	Complete
1898	364	100%	Yes
1899	363	99%	Yes
1900	297	81%	No
1901	342	94%	Yes
1902	326	89%	No
1903	359	98%	Yes
1904	357	98%	Yes
1905	358	98%	Yes
1906	299	82%	No
1907	287	79%	No
1908	364	99%	Yes
1909	363	99%	Yes
1910	362	99%	Yes
1911	362	99%	Yes
1912	364	99%	Yes
1913	360	99%	Yes
1914	358	98%	Yes
1915	357	98%	Yes
1916	364	99%	Yes
1917	348	95%	Yes
1918	333	91%	Yes
1919	361	99%	Yes
1920	366	100%	Yes
1921	343	94%	Yes
1922	353	97%	Yes
1923	344	94%	Yes
1924	361	99%	Yes
1925	348	95%	Yes
1926	359	98%	Yes
1927	361	99%	Yes
1928	363	99%	Yes
1929	340	93%	Yes
1930	341	93%	Yes
1931	361	99%	Yes
1932	361	99%	Yes
1933	361	99%	Yes
1934	363	99%	Yes
1935	364	100%	Yes
1936	366	100%	Yes
1937	362	99%	Yes
1938	362	99%	Yes
1939	355	97%	Yes
1940	360	98%	Yes
1941	361	99%	Yes
1942	360	99%	Yes
1943	363	99%	Yes
1944	362	99%	Yes
1945	363	99%	Yes
1946	360	99%	Yes
1947	364	100%	Yes
1948	69	19%	No

Latest Records

Latest records at Mascoutah
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 April 1953	Mascoutah, US	daily snowfall	2.5 cm (1.0 in)	2.5 cm (1.0 in)	59 years	20 of 100 (Routine)
14 March 1953	Mascoutah, US	daily rain	28.4 mm (1.1 in)	11.9 mm (0.5 in)	52 years	30 of 100 (Routine)
11 February 1953	Mascoutah, US	daily rain	14.2 mm (0.6 in)	6.8 mm (0.27 in)	28 years	20 of 100 (Routine)
14 September 1952	Mascoutah, US	daily rain	57.2 mm (2.3 in)	37.1 mm (1.5 in)	19 years	32 of 100 (Routine)
12 April 1952	Mascoutah, US	daily rain	52.8 mm (2.1 in)	2.0 mm (0.08 in)	43 years	19 of 100 (Routine)
4 April 1952	Mascoutah, US	daily rain	39.1 mm (1.5 in)	8.4 mm (0.33 in)	53 years	28 of 100 (Routine)
2 March 1952	Mascoutah, US	daily snowfall	5.1 cm (2.0 in)	1.3 cm (0.5 in)	9 years	10 of 100 (Routine)
2 January 1952	Mascoutah, US	daily snowfall	3.0 cm (1.2 in)	0.5 cm (0.2 in)	48 years	20 of 100 (Routine)
23 October 1951	Mascoutah, US	daily rain	85.1 mm (3.4 in)	64.8 mm (2.6 in)	37 years	56 of 100 (Notable)
17 June 1951	Mascoutah, US	daily rain	27.7 mm (1.1 in)	1.0 mm (0.04 in)	36 years	15 of 100 (Routine)
12 June 1951	Mascoutah, US	daily rain	25.7 mm (1.0 in)	5.1 mm (0.20 in)	28 years	16 of 100 (Routine)
21 March 1951	Mascoutah, US	daily snowfall	8.9 cm (3.5 in)	6.4 cm (2.5 in)	36 years	26 of 100 (Routine)
17 March 1951	Mascoutah, US	daily rain	25.7 mm (1.0 in)	2.8 mm (0.11 in)	53 years	23 of 100 (Routine)
20 February 1951	Mascoutah, US	daily rain	36.8 mm (1.4 in)	3.5 mm (0.14 in)	40 years	20 of 100 (Routine)
16 February 1951	Mascoutah, US	daily rain	25.7 mm (1.0 in)	8.9 mm (0.35 in)	40 years	25 of 100 (Routine)
6 February 1951	Mascoutah, US	daily rain	39.1 mm (1.5 in)	20.8 mm (0.8 in)	8 years	27 of 100 (Routine)
1 February 1951	Mascoutah, US	daily snowfall	3.6 cm (1.4 in)	1.1 cm (0.4 in)	55 years	20 of 100 (Routine)
31 January 1951	Mascoutah, US	daily snowfall	7.6 cm (3.0 in)	2.8 cm (1.1 in)	3 years	11 of 100 (Routine)
10 January 1951	Mascoutah, US	daily rain	30.7 mm (1.2 in)	18.0 mm (0.7 in)	45 years	34 of 100 (Routine)
6 December 1950	Mascoutah, US	daily snowfall	10.4 cm (4.1 in)	10.4 cm (4.1 in)	56 years	48 of 100 (Notable)

Climate Trend

42 complete years, 1898 to 1947

One stripe for each of 42 complete years at Mascoutah, 1898 to 1947. Blue stripes are years cooler than the station's own mean of 13.4 C (56.1 F); red stripes are warmer. The coolest year was 1904, at 10.8 C (51.4 F), and the warmest was 1921, at 15.3 C (59.6 F). The strongest colour marks a difference of 2.7 C (4.9 F).

Annual mean temperature at Mascoutah as warming stripes, 1898 to 1947
Year	Annual mean temperature	Difference from the station mean
1898	12.7 C	-0.68 C
1899	12.4 C	-0.99 C
1901	12.3 C	-1.10 C
1903	11.6 C	-1.81 C
1904	10.8 C	-2.62 C
1905	11.5 C	-1.90 C
1908	14.6 C	+1.16 C
1909	13.9 C	+0.48 C
1910	13.4 C	+0.03 C
1911	14.6 C	+1.20 C
1912	12.6 C	-0.86 C
1913	14.3 C	+0.89 C
1914	14.0 C	+0.56 C
1915	13.1 C	-0.35 C
1916	13.3 C	-0.12 C
1917	11.6 C	-1.81 C
1919	13.9 C	+0.49 C
1920	12.8 C	-0.58 C
1921	15.3 C	+1.90 C
1922	14.1 C	+0.69 C
1924	12.2 C	-1.24 C
1926	13.0 C	-0.41 C
1927	13.6 C	+0.16 C
1928	13.3 C	-0.13 C
1930	13.7 C	+0.24 C
1931	14.7 C	+1.33 C
1932	13.8 C	+0.42 C
1933	14.7 C	+1.28 C
1934	14.0 C	+0.63 C
1935	13.0 C	-0.41 C
1936	13.3 C	-0.14 C
1937	12.6 C	-0.80 C
1938	14.6 C	+1.16 C
1939	14.4 C	+1.02 C
1940	12.9 C	-0.52 C
1941	14.6 C	+1.21 C
1942	13.7 C	+0.32 C
1943	13.3 C	-0.10 C
1944	13.9 C	+0.45 C
1945	13.1 C	-0.29 C
1946	14.7 C	+1.30 C
1947	13.4 C	-0.01 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.5) per decade over 1898 to 1947. In Fahrenheit: 0.5 F (0.1 to 0.9) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Mascoutah
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.3 C (0.1 to 0.5) per decade	0.5 F (0.1 to 0.9) per decade	1898 to 1947	42	Rise
Mean daily maximum	0.4 C (0.1 to 0.6) per decade	0.7 F (0.2 to 1.1) per decade	1898 to 1947	42	Rise
Mean daily minimum	0.20 C (0.01 to 0.38) per decade	0.35 F (0.03 to 0.68) per decade	1898 to 1947	42	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

1893 to 1954

Yearly extremes at Mascoutah: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	45.0 C (113.0 F)	1934	38.9 C (102.0 F)	51
Coldest night (TNn)	-28.9 C (-20.0 F)	1899	-20.0 C (-4.0 F)	51
Wettest day (Rx1day)	209.3 mm (8.2 in)	1946	66.7 mm (2.6 in)	62
Wettest five days (Rx5day)	388.6 mm (15.3 in)	1946	103.0 mm (4.1 in)	62
Longest dry spell (CDD)	38 days	1909	23 days	62

Hottest day (TXx)

The hottest day of the year at Mascoutah, 1893 to 1954. The record is 45.0 C (113.0 F) in 1934, marked on the chart; the median year is 38.9 C (102.0 F).

Hottest day (TXx) at Mascoutah by year
Year	Hottest day (TXx)
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	36.1 C (97.0 F)
1899	40.0 C (104.0 F)
1900	37.8 C (100.0 F)
1901	42.8 C (109.0 F)
1902	36.7 C (98.1 F)
1903	35.6 C (96.1 F)
1904	33.3 C (91.9 F)
1905	37.2 C (99.0 F)
1906	35.6 C (96.1 F)
1907	37.8 C (100.0 F)
1908	38.3 C (100.9 F)
1909	40.6 C (105.1 F)
1910	37.8 C (100.0 F)
1911	42.2 C (108.0 F)
1912	38.9 C (102.0 F)
1913	41.1 C (106.0 F)
1914	41.1 C (106.0 F)
1915	34.4 C (93.9 F)
1916	40.0 C (104.0 F)
1917	35.6 C (96.1 F)
1918	42.8 C (109.0 F)
1919	40.0 C (104.0 F)
1920	38.3 C (100.9 F)
1921	40.6 C (105.1 F)
1922	39.4 C (102.9 F)
1923	36.7 C (98.1 F)
1924	37.2 C (99.0 F)
1925	40.6 C (105.1 F)
1926	40.6 C (105.1 F)
1927	37.2 C (99.0 F)
1928	36.7 C (98.1 F)
1929	37.8 C (100.0 F)
1930	42.8 C (109.0 F)
1931	41.1 C (106.0 F)
1932	39.4 C (102.9 F)
1933	41.1 C (106.0 F)
1934	45.0 C (113.0 F)
1935	37.2 C (99.0 F)
1936	43.9 C (111.0 F)
1937	37.2 C (99.0 F)
1938	38.9 C (102.0 F)
1939	39.4 C (102.9 F)
1940	39.4 C (102.9 F)
1941	41.1 C (106.0 F)
1942	37.8 C (100.0 F)
1943	39.4 C (102.9 F)
1944	38.3 C (100.9 F)
1945	38.3 C (100.9 F)
1946	37.8 C (100.0 F)
1947	41.1 C (106.0 F)
1948	30.6 C (87.1 F)
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a

Coldest night (TNn)

The coldest night of the year at Mascoutah, 1893 to 1954. The record is -28.9 C (-20.0 F) in 1899, marked on the chart; the median year is -20.0 C (-4.0 F).

Coldest night (TNn) at Mascoutah by year
Year	Coldest night (TNn)
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	-23.9 C (-11.0 F)
1899	-28.9 C (-20.0 F)
1900	-18.3 C (-0.9 F)
1901	-26.1 C (-15.0 F)
1902	-20.0 C (-4.0 F)
1903	-21.1 C (-6.0 F)
1904	-28.9 C (-20.0 F)
1905	-27.8 C (-18.0 F)
1906	-22.2 C (-8.0 F)
1907	-7.2 C (19.0 F)
1908	-13.9 C (7.0 F)
1909	-21.7 C (-7.1 F)
1910	-26.7 C (-16.1 F)
1911	-16.1 C (3.0 F)
1912	-28.3 C (-18.9 F)
1913	-20.6 C (-5.1 F)
1914	-19.4 C (-2.9 F)
1915	-26.7 C (-16.1 F)
1916	-23.3 C (-9.9 F)
1917	-23.3 C (-9.9 F)
1918	-27.8 C (-18.0 F)
1919	-18.9 C (-2.0 F)
1920	-17.8 C (0.0 F)
1921	-13.3 C (8.1 F)
1922	-16.7 C (1.9 F)
1923	-17.2 C (1.0 F)
1924	-23.9 C (-11.0 F)
1925	-18.9 C (-2.0 F)
1926	-18.9 C (-2.0 F)
1927	-20.0 C (-4.0 F)
1928	-20.6 C (-5.1 F)
1929	-22.2 C (-8.0 F)
1930	-28.9 C (-20.0 F)
1931	-13.9 C (7.0 F)
1932	-18.3 C (-0.9 F)
1933	-22.8 C (-9.0 F)
1934	-26.1 C (-15.0 F)
1935	-17.8 C (0.0 F)
1936	-23.9 C (-11.0 F)
1937	-16.1 C (3.0 F)
1938	-14.4 C (6.1 F)
1939	-17.2 C (1.0 F)
1940	-25.6 C (-14.1 F)
1941	-12.2 C (10.0 F)
1942	-21.1 C (-6.0 F)
1943	-20.6 C (-5.1 F)
1944	-17.8 C (0.0 F)
1945	-19.4 C (-2.9 F)
1946	-18.3 C (-0.9 F)
1947	-15.0 C (5.0 F)
1948	-13.3 C (8.1 F)
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a

Wettest day (Rx1day)

The wettest day of the year at Mascoutah, 1893 to 1954. The record is 209.3 mm (8.2 in) in 1946, marked on the chart; the median year is 66.7 mm (2.6 in).

Wettest day (Rx1day) at Mascoutah by year
Year	Wettest day (Rx1day)
1893	78.7 mm (3.1 in)
1894	66.0 mm (2.6 in)
1895	83.8 mm (3.3 in)
1896	114.3 mm (4.5 in)
1897	99.1 mm (3.9 in)
1898	62.5 mm (2.5 in)
1899	55.4 mm (2.2 in)
1900	57.9 mm (2.3 in)
1901	50.8 mm (2.0 in)
1902	52.3 mm (2.1 in)
1903	53.8 mm (2.1 in)
1904	101.6 mm (4.0 in)
1905	119.4 mm (4.7 in)
1906	50.3 mm (2.0 in)
1907	49.8 mm (2.0 in)
1908	72.6 mm (2.9 in)
1909	89.2 mm (3.5 in)
1910	99.1 mm (3.9 in)
1911	52.8 mm (2.1 in)
1912	94.0 mm (3.7 in)
1913	63.5 mm (2.5 in)
1914	49.3 mm (1.9 in)
1915	165.1 mm (6.5 in)
1916	122.4 mm (4.8 in)
1917	153.4 mm (6.0 in)
1918	73.9 mm (2.9 in)
1919	107.2 mm (4.2 in)
1920	50.8 mm (2.0 in)
1921	61.2 mm (2.4 in)
1922	77.5 mm (3.1 in)
1923	74.9 mm (2.9 in)
1924	95.5 mm (3.8 in)
1925	69.9 mm (2.8 in)
1926	48.5 mm (1.9 in)
1927	68.8 mm (2.7 in)
1928	67.6 mm (2.7 in)
1929	56.1 mm (2.2 in)
1930	47.8 mm (1.9 in)
1931	96.8 mm (3.8 in)
1932	51.1 mm (2.0 in)
1933	50.3 mm (2.0 in)
1934	49.3 mm (1.9 in)
1935	69.9 mm (2.8 in)
1936	71.1 mm (2.8 in)
1937	48.3 mm (1.9 in)
1938	79.2 mm (3.1 in)
1939	58.9 mm (2.3 in)
1940	46.7 mm (1.8 in)
1941	101.6 mm (4.0 in)
1942	88.4 mm (3.5 in)
1943	50.8 mm (2.0 in)
1944	38.4 mm (1.5 in)
1945	70.6 mm (2.8 in)
1946	209.3 mm (8.2 in)
1947	67.3 mm (2.6 in)
1948	64.8 mm (2.6 in)
1949	56.1 mm (2.2 in)
1950	64.0 mm (2.5 in)
1951	85.1 mm (3.4 in)
1952	57.2 mm (2.3 in)
1953	32.0 mm (1.3 in)
1954	13.2 mm (0.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Mascoutah, 1893 to 1954. The record is 388.6 mm (15.3 in) in 1946, marked on the chart; the median year is 103.0 mm (4.1 in).

Wettest five days (Rx5day) at Mascoutah by year
Year	Wettest five days (Rx5day)
1893	88.9 mm (3.5 in)
1894	76.2 mm (3.0 in)
1895	88.8 mm (3.5 in)
1896	119.4 mm (4.7 in)
1897	120.2 mm (4.7 in)
1898	112.0 mm (4.4 in)
1899	78.5 mm (3.1 in)
1900	76.4 mm (3.0 in)
1901	62.2 mm (2.4 in)
1902	96.8 mm (3.8 in)
1903	77.5 mm (3.1 in)
1904	131.1 mm (5.2 in)
1905	126.2 mm (5.0 in)
1906	128.8 mm (5.1 in)
1907	75.2 mm (3.0 in)
1908	138.6 mm (5.5 in)
1909	126.1 mm (5.0 in)
1910	156.0 mm (6.1 in)
1911	102.4 mm (4.0 in)
1912	117.5 mm (4.6 in)
1913	142.0 mm (5.6 in)
1914	98.9 mm (3.9 in)
1915	251.1 mm (9.9 in)
1916	271.7 mm (10.7 in)
1917	153.4 mm (6.0 in)
1918	99.1 mm (3.9 in)
1919	142.2 mm (5.6 in)
1920	112.5 mm (4.4 in)
1921	102.6 mm (4.0 in)
1922	106.2 mm (4.2 in)
1923	98.0 mm (3.9 in)
1924	103.1 mm (4.1 in)
1925	105.7 mm (4.2 in)
1926	86.9 mm (3.4 in)
1927	126.0 mm (5.0 in)
1928	83.1 mm (3.3 in)
1929	105.7 mm (4.2 in)
1930	95.1 mm (3.7 in)
1931	116.9 mm (4.6 in)
1932	56.9 mm (2.2 in)
1933	111.8 mm (4.4 in)
1934	68.6 mm (2.7 in)
1935	95.3 mm (3.8 in)
1936	82.5 mm (3.2 in)
1937	85.1 mm (3.4 in)
1938	107.6 mm (4.2 in)
1939	71.6 mm (2.8 in)
1940	59.9 mm (2.4 in)
1941	119.1 mm (4.7 in)
1942	133.1 mm (5.2 in)
1943	129.5 mm (5.1 in)
1944	63.5 mm (2.5 in)
1945	96.0 mm (3.8 in)
1946	388.6 mm (15.3 in)
1947	103.4 mm (4.1 in)
1948	102.9 mm (4.1 in)
1949	113.3 mm (4.5 in)
1950	116.1 mm (4.6 in)
1951	100.6 mm (4.0 in)
1952	70.4 mm (2.8 in)
1953	71.8 mm (2.8 in)
1954	19.3 mm (0.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Mascoutah, 1893 to 1954. The record is 38 days in 1909, marked on the chart; the median year is 23 days.

Longest dry spell (CDD) at Mascoutah by year
Year	Longest dry spell (CDD)
1893	20 days
1894	26 days
1895	15 days
1896	30 days
1897	24 days
1898	16 days
1899	27 days
1900	29 days
1901	17 days
1902	19 days
1903	16 days
1904	12 days
1905	19 days
1906	21 days
1907	22 days
1908	32 days
1909	38 days
1910	34 days
1911	20 days
1912	18 days
1913	26 days
1914	36 days
1915	24 days
1916	18 days
1917	35 days
1918	20 days
1919	25 days
1920	26 days
1921	22 days
1922	28 days
1923	24 days
1924	23 days
1925	26 days
1926	19 days
1927	25 days
1928	18 days
1929	24 days
1930	30 days
1931	19 days
1932	20 days
1933	25 days
1934	18 days
1935	17 days
1936	22 days
1937	22 days
1938	24 days
1939	16 days
1940	35 days
1941	19 days
1942	23 days
1943	26 days
1944	28 days
1945	17 days
1946	17 days
1947	21 days
1948	23 days
1949	21 days
1950	27 days
1951	14 days
1952	24 days
1953	26 days
1954	19 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

42 years with a frost

Across 42 years with a frost, the median last spring frost at Mascoutah falls on 17 April and the median first autumn frost on 18 October, which leaves a median of 183 days between them.

Fitted over all years, the growing season changes by +1.9 days per decade at this station.

Frost dates and growing season at Mascoutah
Measure	Median, all years	Earliest period	Recent period (1914 to 1947)	Recent against earliest	Fitted trend
Last spring frost	17 April	n/a	17 April	n/a	-1.1 days per decade
First autumn frost	18 October	n/a	17 October	n/a	+0.8 days per decade
Growing days	183 days	n/a	184 days	n/a	+1.9 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

49 years, 1893 to 1953

A day with at least 67.2 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 211.9 mm (8.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Mascoutah: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	67.2 mm (2.6 in)
5 years	93.3 mm (3.7 in)
10 years	114.8 mm (4.5 in)
25 years	147.8 mm (5.8 in)
50 years	177.4 mm (7.0 in)	Longer than the 49 years of record
100 years	211.9 mm (8.3 in)	Longer than the 49 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, 49 years of values from 1893 to 1953.

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: 209.3 mm (8.2 in) in 1946; 165.1 mm (6.5 in) in 1915; 153.4 mm (6.0 in) in 1917.

Station Changes

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

Download the Data

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