St Charles Co AP Weather Records (USW00053904)

Record envelope, standing records and threshold days for St Charles Co AP (USW00053904), Missouri, United States, with 30 years of record.

Key Facts for St Charles Co AP

St Charles Co AP (USW00053904) is a weather station in Missouri, United States at 38.93 latitude and -90.43 longitude, 132 m (432 ft) above sea level.
The station reports from 1997 to 2026, 30 years of record.
1,464 records set at St Charles Co AP still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Missouri, United States, 38.93 latitude, -90.43 longitude.
Elevation: 132 m (432 ft).
Period of record: 1997 to 2026, 30 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

33 days at or beyond a record

The band shows the record high and record low for each calendar day at St Charles Co AP. The lines show the 2026 daily maximum and minimum. 33 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at St Charles Co AP, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	23.3 C (73.9 F)	-25.0 C (-13.0 F)	13.3 C (55.9 F)	-18.2 C (-0.8 F)
Feb	30.0 C (86.0 F)	-24.3 C (-11.7 F)	22.2 C (72.0 F)	-18.2 C (-0.8 F)
Mar	30.0 C (86.0 F)	-16.6 C (2.1 F)	29.4 C (84.9 F)	-7.1 C (19.2 F)
Apr	34.4 C (93.9 F)	-4.9 C (23.2 F)	30.6 C (87.1 F)	-1.6 C (29.1 F)
May	35.0 C (95.0 F)	0.6 C (33.1 F)	31.7 C (89.1 F)	6.1 C (43.0 F)
Jun	40.6 C (105.1 F)	8.9 C (48.0 F)	35.6 C (96.1 F)	13.9 C (57.0 F)
Jul	41.1 C (106.0 F)	10.6 C (51.1 F)	35.6 C (96.1 F)	18.3 C (64.9 F)
Aug	39.4 C (102.9 F)	8.9 C (48.0 F)	36.7 C (98.1 F)	9.4 C (48.9 F)
Sep	38.9 C (102.0 F)	0.6 C (33.1 F)	36.1 C (97.0 F)	7.8 C (46.0 F)
Oct	34.4 C (93.9 F)	-4.9 C (23.2 F)	32.2 C (90.0 F)	-0.6 C (30.9 F)
Nov	28.9 C (84.0 F)	-11.1 C (12.0 F)	26.7 C (80.1 F)	-8.3 C (17.1 F)
Dec	25.0 C (77.0 F)	-21.0 C (-5.8 F)	25.0 C (77.0 F)	-14.4 C (6.1 F)

Which Years Hold Standing Records

1,464 standing records

1,464 records at St Charles Co AP still stand. 2012 holds the most, with 87.

Standing records at St Charles Co AP by the year they were set
Year set	Standing records
1997	33
1998	48
1999	63
2000	73
2001	51
2002	55
2003	52
2004	56
2005	43
2006	49
2007	63
2008	42
2009	49
2010	39
2011	64
2012	87
2013	43
2014	69
2015	50
2016	43
2017	63
2018	59
2019	7
2020	27
2021	40
2022	54
2023	44
2024	49
2025	49

Wettest Day of Each Month

Dec: 106.2 mm (4.2 in)

The wettest day on record for each calendar month at St Charles Co AP. The most was 106.2 mm (4.2 in) on 26 December 2015.

Record daily precipitation for each month at St Charles Co AP
Month	Record daily precipitation (mm)	Date
Jan	48.5 mm (1.9 in)	3 January 2005
Feb	61.7 mm (2.4 in)	5 February 2008
Mar	62.5 mm (2.5 in)	18 March 2021
Apr	75.7 mm (3.0 in)	30 April 2019
May	86.4 mm (3.4 in)	12 May 2002
Jun	81.8 mm (3.2 in)	27 June 2010
Jul	96.8 mm (3.8 in)	16 July 2024
Aug	90.7 mm (3.6 in)	7 August 2014
Sep	84.1 mm (3.3 in)	14 September 2008
Oct	88.6 mm (3.5 in)	8 October 2009
Nov	81.5 mm (3.2 in)	4 November 2024
Dec	106.2 mm (4.2 in)	26 December 2015

Period of Record Coverage

1997 to 2025

29 years of record at St Charles Co AP, 1997 to 2025. 3 years have data for under 90 percent of days and are left out of rankings: 1997, 2002, 2019.

Days with data per year at St Charles Co AP
Year	Days with data	Share of year	Complete
1997	211	58%	No
1998	333	91%	Yes
1999	358	98%	Yes
2000	360	98%	Yes
2001	358	98%	Yes
2002	327	90%	No
2003	357	98%	Yes
2004	366	100%	Yes
2005	361	99%	Yes
2006	359	98%	Yes
2007	365	100%	Yes
2008	359	98%	Yes
2009	363	99%	Yes
2010	364	100%	Yes
2011	364	100%	Yes
2012	365	100%	Yes
2013	355	97%	Yes
2014	364	100%	Yes
2015	362	99%	Yes
2016	362	99%	Yes
2017	364	100%	Yes
2018	362	99%	Yes
2019	131	36%	No
2020	345	94%	Yes
2021	357	98%	Yes
2022	363	99%	Yes
2023	345	95%	Yes
2024	361	99%	Yes
2025	364	100%	Yes

Latest Records

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

Climate Trend

23 complete years, 1999 to 2025

One stripe for each of 23 complete years at St Charles Co AP, 1999 to 2025. Blue stripes are years cooler than the station's own mean of 13.3 C (56.0 F); red stripes are warmer. The coolest year was 2014, at 11.6 C (52.9 F), and the warmest was 2012, at 14.8 C (58.6 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at St Charles Co AP as warming stripes, 1999 to 2025
Year	Annual mean temperature	Difference from the station mean
1999	13.4 C	+0.03 C
2000	12.8 C	-0.57 C
2001	13.3 C	-0.07 C
2003	12.4 C	-0.93 C
2004	12.9 C	-0.50 C
2005	13.3 C	-0.01 C
2006	13.6 C	+0.24 C
2007	13.7 C	+0.36 C
2008	12.3 C	-1.09 C
2009	12.4 C	-0.91 C
2010	13.2 C	-0.19 C
2011	13.5 C	+0.17 C
2012	14.8 C	+1.43 C
2013	12.4 C	-0.98 C
2014	11.6 C	-1.74 C
2015	13.4 C	+0.02 C
2016	14.3 C	+0.95 C
2017	14.3 C	+0.97 C
2018	13.5 C	+0.12 C
2021	14.5 C	+1.19 C
2022	13.3 C	-0.10 C
2024	14.8 C	+1.40 C
2025	13.5 C	+0.18 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

1997 to 2026

Yearly extremes at St Charles Co AP: 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)	2012	38.3 C (100.9 F)	30
Coldest night (TNn)	-25.0 C (-13.0 F)	1999	-18.5 C (-1.3 F)	30
Wettest day (Rx1day)	106.2 mm (4.2 in)	2015	65.5 mm (2.6 in)	29
Wettest five days (Rx5day)	204.2 mm (8.0 in)	2015	96.7 mm (3.8 in)	29
Longest dry spell (CDD)	32 days	2002	21 days	29

Hottest day (TXx)

The hottest day of the year at St Charles Co AP, 1997 to 2026. The record is 41.1 C (106.0 F) in 2012, marked on the chart; the median year is 38.3 C (100.9 F).

Hottest day (TXx) at St Charles Co AP by year
Year	Hottest day (TXx)
1997	37.8 C (100.0 F)
1998	36.7 C (98.1 F)
1999	38.9 C (102.0 F)
2000	37.8 C (100.0 F)
2001	36.7 C (98.1 F)
2002	40.6 C (105.1 F)
2003	38.3 C (100.9 F)
2004	35.6 C (96.1 F)
2005	38.9 C (102.0 F)
2006	38.3 C (100.9 F)
2007	39.4 C (102.9 F)
2008	36.7 C (98.1 F)
2009	36.1 C (97.0 F)
2010	38.3 C (100.9 F)
2011	38.9 C (102.0 F)
2012	41.1 C (106.0 F)
2013	38.3 C (100.9 F)
2014	36.1 C (97.0 F)
2015	36.7 C (98.1 F)
2016	37.2 C (99.0 F)
2017	38.9 C (102.0 F)
2018	37.2 C (99.0 F)
2019	32.8 C (91.0 F)
2020	35.6 C (96.1 F)
2021	38.3 C (100.9 F)
2022	38.9 C (102.0 F)
2023	38.3 C (100.9 F)
2024	38.3 C (100.9 F)
2025	36.7 C (98.1 F)
2026	38.3 C (100.9 F)

Coldest night (TNn)

The coldest night of the year at St Charles Co AP, 1997 to 2026. The record is -25.0 C (-13.0 F) in 1999, marked on the chart; the median year is -18.5 C (-1.3 F).

Coldest night (TNn) at St Charles Co AP by year
Year	Coldest night (TNn)
1997	-10.0 C (14.0 F)
1998	-16.7 C (1.9 F)
1999	-25.0 C (-13.0 F)
2000	-19.4 C (-2.9 F)
2001	-22.2 C (-8.0 F)
2002	-15.0 C (5.0 F)
2003	-20.0 C (-4.0 F)
2004	-17.8 C (0.0 F)
2005	-20.6 C (-5.1 F)
2006	-15.5 C (4.1 F)
2007	-17.1 C (1.2 F)
2008	-16.0 C (3.2 F)
2009	-19.3 C (-2.7 F)
2010	-22.1 C (-7.8 F)
2011	-18.8 C (-1.8 F)
2012	-13.2 C (8.2 F)
2013	-14.9 C (5.2 F)
2014	-24.9 C (-12.8 F)
2015	-20.5 C (-4.9 F)
2016	-16.6 C (2.1 F)
2017	-17.1 C (1.2 F)
2018	-18.2 C (-0.8 F)
2019	-21.0 C (-5.8 F)
2020	-15.5 C (4.1 F)
2021	-19.9 C (-3.8 F)
2022	-21.0 C (-5.8 F)
2023	-11.6 C (11.1 F)
2024	-22.1 C (-7.8 F)
2025	-18.2 C (-0.8 F)
2026	-23.3 C (-9.9 F)

Wettest day (Rx1day)

The wettest day of the year at St Charles Co AP, 1997 to 2026. The record is 106.2 mm (4.2 in) in 2015, marked on the chart; the median year is 65.5 mm (2.6 in).

Wettest day (Rx1day) at St Charles Co AP by year
Year	Wettest day (Rx1day)
1997	n/a
1998	78.2 mm (3.1 in)
1999	52.3 mm (2.1 in)
2000	63.0 mm (2.5 in)
2001	65.0 mm (2.6 in)
2002	86.4 mm (3.4 in)
2003	60.5 mm (2.4 in)
2004	60.5 mm (2.4 in)
2005	70.6 mm (2.8 in)
2006	84.8 mm (3.3 in)
2007	31.2 mm (1.2 in)
2008	84.1 mm (3.3 in)
2009	88.6 mm (3.5 in)
2010	81.8 mm (3.2 in)
2011	40.6 mm (1.6 in)
2012	57.4 mm (2.3 in)
2013	79.5 mm (3.1 in)
2014	90.7 mm (3.6 in)
2015	106.2 mm (4.2 in)
2016	59.9 mm (2.4 in)
2017	65.5 mm (2.6 in)
2018	45.7 mm (1.8 in)
2019	75.7 mm (3.0 in)
2020	59.2 mm (2.3 in)
2021	66.8 mm (2.6 in)
2022	87.4 mm (3.4 in)
2023	38.9 mm (1.5 in)
2024	96.8 mm (3.8 in)
2025	47.0 mm (1.9 in)
2026	41.1 mm (1.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at St Charles Co AP, 1997 to 2026. The record is 204.2 mm (8.0 in) in 2015, marked on the chart; the median year is 96.7 mm (3.8 in).

Wettest five days (Rx5day) at St Charles Co AP by year
Year	Wettest five days (Rx5day)
1997	n/a
1998	96.7 mm (3.8 in)
1999	101.1 mm (4.0 in)
2000	142.3 mm (5.6 in)
2001	82.3 mm (3.2 in)
2002	118.7 mm (4.7 in)
2003	88.0 mm (3.5 in)
2004	96.3 mm (3.8 in)
2005	133.0 mm (5.2 in)
2006	90.7 mm (3.6 in)
2007	57.5 mm (2.3 in)
2008	94.6 mm (3.7 in)
2009	105.2 mm (4.1 in)
2010	123.2 mm (4.9 in)
2011	104.9 mm (4.1 in)
2012	84.4 mm (3.3 in)
2013	85.6 mm (3.4 in)
2014	114.1 mm (4.5 in)
2015	204.2 mm (8.0 in)
2016	87.7 mm (3.5 in)
2017	153.8 mm (6.1 in)
2018	74.9 mm (2.9 in)
2019	116.9 mm (4.6 in)
2020	90.2 mm (3.6 in)
2021	99.1 mm (3.9 in)
2022	128.3 mm (5.1 in)
2023	49.3 mm (1.9 in)
2024	143.5 mm (5.6 in)
2025	81.3 mm (3.2 in)
2026	66.3 mm (2.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at St Charles Co AP, 1997 to 2026. The record is 32 days in 2002, marked on the chart; the median year is 21 days.

Longest dry spell (CDD) at St Charles Co AP by year
Year	Longest dry spell (CDD)
1997	n/a
1998	11 days
1999	20 days
2000	15 days
2001	16 days
2002	32 days
2003	26 days
2004	23 days
2005	19 days
2006	18 days
2007	21 days
2008	18 days
2009	27 days
2010	21 days
2011	23 days
2012	22 days
2013	21 days
2014	21 days
2015	21 days
2016	18 days
2017	32 days
2018	22 days
2019	17 days
2020	21 days
2021	16 days
2022	17 days
2023	21 days
2024	27 days
2025	23 days
2026	21 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

23 years with a frost

Across 23 years with a frost, the median last spring frost at St Charles Co AP falls on 9 April and the median first autumn frost on 22 October, which leaves a median of 198 days between them.

Frost dates and growing season at St Charles Co AP
Measure	Median, all years	Earliest period	Recent period (1999 to 2025)	Recent against earliest	Fitted trend
Last spring frost	9 April	n/a	9 April	n/a	n/a
First autumn frost	22 October	n/a	22 October	n/a	n/a
Growing days	198 days	n/a	198 days	n/a	n/a

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.

Download the Data

Data for St Charles Co AP standing records by year: CSV or JSON. Field meanings are on the data page.
Data for St Charles Co AP 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).