St Charles Weather Records (USC00137340)

Record envelope, standing records and threshold days for St Charles (USC00137340), Iowa, United States, with 56 years of record.

Key Facts for St Charles

St Charles (USC00137340) is a weather station in Iowa, United States at 41.29 latitude and -93.81 longitude, 323 m (1,060 ft) above sea level.
The station reports from 1896 to 1951, 56 years of record.
1,464 records set at St Charles still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Iowa, United States, 41.29 latitude, -93.81 longitude.
Elevation: 323 m (1,060 ft).
Period of record: 1896 to 1951, 56 years.
Eligible elements: none yet.

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 St Charles. 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 St Charles, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	17.8 C (64.0 F)	-35.6 C (-32.1 F)	n/a	n/a
Feb	20.6 C (69.1 F)	-32.8 C (-27.0 F)	n/a	n/a
Mar	32.2 C (90.0 F)	-24.4 C (-11.9 F)	n/a	n/a
Apr	33.3 C (91.9 F)	-11.1 C (12.0 F)	n/a	n/a
May	33.9 C (93.0 F)	-3.9 C (25.0 F)	n/a	n/a
Jun	38.3 C (100.9 F)	4.4 C (39.9 F)	n/a	n/a
Jul	42.8 C (109.0 F)	10.0 C (50.0 F)	n/a	n/a
Aug	43.3 C (109.9 F)	4.4 C (39.9 F)	n/a	n/a
Sep	39.4 C (102.9 F)	-1.7 C (28.9 F)	n/a	n/a
Oct	32.8 C (91.0 F)	-9.4 C (15.1 F)	n/a	n/a
Nov	28.9 C (84.0 F)	-20.0 C (-4.0 F)	n/a	n/a
Dec	17.8 C (64.0 F)	-30.0 C (-22.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at St Charles still stand. 1911 holds the most, with 96.

Standing records at St Charles by the year they were set
Year set	Standing records
1896	30
1897	77
1898	40
1901	91
1902	72
1903	60
1904	51
1905	77
1906	62
1907	63
1908	61
1909	65
1910	78
1911	96
1912	82
1913	94
1914	62
1915	77
1916	65
1917	64
1918	84
1919	13

Wettest Day of Each Month

Sep: 145.8 mm (5.7 in)

The wettest day on record for each calendar month at St Charles. The most was 145.8 mm (5.7 in) on 4 September 1917.

Record daily precipitation for each month at St Charles
Month	Record daily precipitation (mm)	Date
Jan	35.3 mm (1.4 in)	20 January 1904
Feb	39.6 mm (1.6 in)	23 February 1915
Mar	31.2 mm (1.2 in)	9 March 1909
Apr	72.1 mm (2.8 in)	23 April 1904
May	73.7 mm (2.9 in)	11 May 1912
Jun	104.1 mm (4.1 in)	25 June 1914
Jul	107.7 mm (4.2 in)	9 July 1902
Aug	132.1 mm (5.2 in)	15 August 1908
Sep	145.8 mm (5.7 in)	4 September 1917
Oct	59.2 mm (2.3 in)	9 October 1909
Nov	54.1 mm (2.1 in)	5 November 1905
Dec	31.5 mm (1.2 in)	30 December 1906

Period of Record Coverage

1896 to 1919

22 years of record at St Charles, 1896 to 1919. 4 years have data for under 90 percent of days and are left out of rankings: 1896, 1897, 1898, 1919.

Days with data per year at St Charles
Year	Days with data	Share of year	Complete
1896	120	33%	No
1897	293	80%	No
1898	98	27%	No
1901	352	96%	Yes
1902	364	100%	Yes
1903	360	99%	Yes
1904	365	100%	Yes
1905	362	99%	Yes
1906	364	100%	Yes
1907	365	100%	Yes
1908	364	99%	Yes
1909	362	99%	Yes
1910	355	97%	Yes
1911	365	100%	Yes
1912	362	99%	Yes
1913	365	100%	Yes
1914	365	100%	Yes
1915	364	100%	Yes
1916	358	98%	Yes
1917	365	100%	Yes
1918	365	100%	Yes
1919	59	16%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

16 complete years, 1901 to 1918

One stripe for each of 16 complete years at St Charles, 1901 to 1918. 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 1917, at 8.5 C (47.3 F), and the warmest was 1911, at 11.3 C (52.3 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at St Charles as warming stripes, 1901 to 1918
Year	Annual mean temperature	Difference from the station mean
1901	10.7 C	+0.66 C
1902	9.8 C	-0.27 C
1903	9.7 C	-0.40 C
1904	9.2 C	-0.85 C
1905	9.8 C	-0.30 C
1906	10.5 C	+0.44 C
1907	9.9 C	-0.13 C
1909	9.8 C	-0.26 C
1911	11.3 C	+1.18 C
1912	9.3 C	-0.75 C
1913	11.1 C	+1.05 C
1914	11.0 C	+0.89 C
1915	9.6 C	-0.48 C
1916	10.1 C	+0.04 C
1917	8.5 C	-1.58 C
1918	10.9 C	+0.79 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1896 to 1951

Yearly extremes at St Charles: 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)	1918	36.7 C (98.1 F)	22
Coldest night (TNn)	-35.6 C (-32.1 F)	1912	-26.7 C (-16.1 F)	22
Wettest day (Rx1day)	145.8 mm (5.7 in)	1917	61.4 mm (2.4 in)	26
Wettest five days (Rx5day)	201.0 mm (7.9 in)	1914	84.4 mm (3.3 in)	26
Longest dry spell (CDD)	43 days	1910	26 days	26

Hottest day (TXx)

The hottest day of the year at St Charles, 1896 to 1951. The record is 43.3 C (109.9 F) in 1918, marked on the chart; the median year is 36.7 C (98.1 F).

Hottest day (TXx) at St Charles by year
Year	Hottest day (TXx)
1896	33.3 C (91.9 F)
1897	36.7 C (98.1 F)
1898	35.0 C (95.0 F)
1901	42.2 C (108.0 F)
1902	37.2 C (99.0 F)
1903	35.0 C (95.0 F)
1904	33.9 C (93.0 F)
1905	35.0 C (95.0 F)
1906	36.7 C (98.1 F)
1907	34.4 C (93.9 F)
1908	34.4 C (93.9 F)
1909	36.7 C (98.1 F)
1910	37.2 C (99.0 F)
1911	42.8 C (109.0 F)
1912	37.2 C (99.0 F)
1913	39.4 C (102.9 F)
1914	38.9 C (102.0 F)
1915	33.3 C (91.9 F)
1916	38.9 C (102.0 F)
1917	38.3 C (100.9 F)
1918	43.3 C (109.9 F)
1919	16.7 C (62.1 F)
1948	n/a
1949	n/a
1950	n/a
1951	n/a

Coldest night (TNn)

The coldest night of the year at St Charles, 1896 to 1951. The record is -35.6 C (-32.1 F) in 1912, marked on the chart; the median year is -26.7 C (-16.1 F).

Coldest night (TNn) at St Charles by year
Year	Coldest night (TNn)
1896	-20.0 C (-4.0 F)
1897	-27.2 C (-17.0 F)
1898	-19.4 C (-2.9 F)
1901	-27.8 C (-18.0 F)
1902	-26.7 C (-16.1 F)
1903	-25.0 C (-13.0 F)
1904	-27.8 C (-18.0 F)
1905	-32.8 C (-27.0 F)
1906	-24.4 C (-11.9 F)
1907	-26.7 C (-16.1 F)
1908	-22.8 C (-9.0 F)
1909	-26.1 C (-15.0 F)
1910	-26.1 C (-15.0 F)
1911	-26.1 C (-15.0 F)
1912	-35.6 C (-32.1 F)
1913	-25.0 C (-13.0 F)
1914	-26.1 C (-15.0 F)
1915	-28.9 C (-20.0 F)
1916	-29.4 C (-20.9 F)
1917	-30.0 C (-22.0 F)
1918	-29.4 C (-20.9 F)
1919	-27.8 C (-18.0 F)
1948	n/a
1949	n/a
1950	n/a
1951	n/a

Wettest day (Rx1day)

The wettest day of the year at St Charles, 1896 to 1951. The record is 145.8 mm (5.7 in) in 1917, marked on the chart; the median year is 61.4 mm (2.4 in).

Wettest day (Rx1day) at St Charles by year
Year	Wettest day (Rx1day)
1896	81.3 mm (3.2 in)
1897	48.3 mm (1.9 in)
1898	44.5 mm (1.8 in)
1901	41.9 mm (1.6 in)
1902	107.7 mm (4.2 in)
1903	62.2 mm (2.4 in)
1904	72.1 mm (2.8 in)
1905	85.1 mm (3.4 in)
1906	39.6 mm (1.6 in)
1907	48.8 mm (1.9 in)
1908	132.1 mm (5.2 in)
1909	59.2 mm (2.3 in)
1910	57.2 mm (2.3 in)
1911	33.5 mm (1.3 in)
1912	73.7 mm (2.9 in)
1913	85.1 mm (3.4 in)
1914	137.7 mm (5.4 in)
1915	92.5 mm (3.6 in)
1916	59.4 mm (2.3 in)
1917	145.8 mm (5.7 in)
1918	47.5 mm (1.9 in)
1919	25.9 mm (1.0 in)
1948	72.4 mm (2.9 in)
1949	71.4 mm (2.8 in)
1950	50.5 mm (2.0 in)
1951	60.5 mm (2.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at St Charles, 1896 to 1951. The record is 201.0 mm (7.9 in) in 1914, marked on the chart; the median year is 84.4 mm (3.3 in).

Wettest five days (Rx5day) at St Charles by year
Year	Wettest five days (Rx5day)
1896	116.4 mm (4.6 in)
1897	97.8 mm (3.9 in)
1898	69.7 mm (2.7 in)
1901	55.2 mm (2.2 in)
1902	150.9 mm (5.9 in)
1903	126.5 mm (5.0 in)
1904	136.4 mm (5.4 in)
1905	88.2 mm (3.5 in)
1906	60.1 mm (2.4 in)
1907	80.5 mm (3.2 in)
1908	132.1 mm (5.2 in)
1909	74.2 mm (2.9 in)
1910	75.5 mm (3.0 in)
1911	81.2 mm (3.2 in)
1912	98.0 mm (3.9 in)
1913	85.1 mm (3.4 in)
1914	201.0 mm (7.9 in)
1915	117.9 mm (4.6 in)
1916	68.6 mm (2.7 in)
1917	196.8 mm (7.7 in)
1918	72.1 mm (2.8 in)
1919	34.8 mm (1.4 in)
1948	73.2 mm (2.9 in)
1949	124.7 mm (4.9 in)
1950	71.8 mm (2.8 in)
1951	83.6 mm (3.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at St Charles, 1896 to 1951. The record is 43 days in 1910, marked on the chart; the median year is 26 days.

Longest dry spell (CDD) at St Charles by year
Year	Longest dry spell (CDD)
1896	34 days
1897	23 days
1898	25 days
1901	29 days
1902	24 days
1903	23 days
1904	30 days
1905	25 days
1906	33 days
1907	25 days
1908	26 days
1909	16 days
1910	43 days
1911	20 days
1912	29 days
1913	29 days
1914	29 days
1915	26 days
1916	23 days
1917	31 days
1918	25 days
1919	32 days
1948	22 days
1949	21 days
1950	26 days
1951	17 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.

Download the Data

Data for St Charles standing records by year: CSV or JSON. Field meanings are on the data page.
Data for St Charles 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).