Cahokia St Louis Dwtn AP Weather Records (USW00003960)
Record envelope, standing records and threshold days for Cahokia St Louis Dwtn AP (USW00003960), Illinois, United States, with 30 years of record.
Key Facts for Cahokia St Louis Dwtn AP
- Cahokia St Louis Dwtn AP (USW00003960) is a weather station in Illinois, United States at 38.56 latitude and -90.15 longitude, 123 m (405 ft) above sea level.
- The station reports from 1997 to 2026, 30 years of record.
- 1,464 records set at Cahokia St Louis Dwtn AP still stand.
- Records are tracked for no element yet: an element needs 30 years of data to be eligible.
About the Station
- Location: Illinois, United States, 38.56 latitude, -90.15 longitude.
- Elevation: 123 m (405 ft).
- Period of record: 1997 to 2026, 30 years.
- Eligible elements: none yet.
Daily Record Envelope and 2026
38 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 22.2 C (72.0 F) | -25.5 C (-13.9 F) | 14.4 C (57.9 F) | -16.6 C (2.1 F) |
| Feb | 30.0 C (86.0 F) | -21.6 C (-6.9 F) | 23.9 C (75.0 F) | -17.1 C (1.2 F) |
| Mar | 30.0 C (86.0 F) | -15.5 C (4.1 F) | 29.4 C (84.9 F) | -6.0 C (21.2 F) |
| Apr | 33.3 C (91.9 F) | -4.3 C (24.3 F) | 30.0 C (86.0 F) | -1.0 C (30.2 F) |
| May | 35.0 C (95.0 F) | 0.6 C (33.1 F) | 30.0 C (86.0 F) | 6.1 C (43.0 F) |
| Jun | 41.7 C (107.1 F) | 7.2 C (45.0 F) | 36.1 C (97.0 F) | 12.8 C (55.0 F) |
| Jul | 41.7 C (107.1 F) | 10.0 C (50.0 F) | 36.1 C (97.0 F) | 17.2 C (63.0 F) |
| Aug | 40.6 C (105.1 F) | 8.3 C (46.9 F) | 36.7 C (98.1 F) | 8.3 C (46.9 F) |
| Sep | 38.9 C (102.0 F) | 1.7 C (35.1 F) | 36.1 C (97.0 F) | 5.6 C (42.1 F) |
| Oct | 34.4 C (93.9 F) | -5.5 C (22.1 F) | 32.2 C (90.0 F) | 0.6 C (33.1 F) |
| Nov | 29.4 C (84.9 F) | -11.6 C (11.1 F) | 26.7 C (80.1 F) | -7.2 C (19.0 F) |
| Dec | 25.6 C (78.1 F) | -20.6 C (-5.1 F) | 25.6 C (78.1 F) | -13.9 C (7.0 F) |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1997 | 32 |
| 1998 | 55 |
| 1999 | 53 |
| 2000 | 78 |
| 2001 | 45 |
| 2002 | 52 |
| 2003 | 60 |
| 2004 | 39 |
| 2005 | 31 |
| 2006 | 58 |
| 2007 | 56 |
| 2008 | 42 |
| 2009 | 53 |
| 2010 | 33 |
| 2011 | 48 |
| 2012 | 83 |
| 2013 | 54 |
| 2014 | 62 |
| 2015 | 40 |
| 2016 | 42 |
| 2017 | 73 |
| 2018 | 52 |
| 2019 | 40 |
| 2020 | 27 |
| 2021 | 51 |
| 2022 | 49 |
| 2023 | 50 |
| 2024 | 58 |
| 2025 | 48 |
Wettest Day of Each Month
Jul: 183.6 mm (7.2 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 52.1 mm (2.1 in) | 4 January 2004 |
| Feb | 57.2 mm (2.3 in) | 24 February 2018 |
| Mar | 68.8 mm (2.7 in) | 18 March 2008 |
| Apr | 79.8 mm (3.1 in) | 18 April 2013 |
| May | 59.9 mm (2.4 in) | 16 May 2020 |
| Jun | 121.9 mm (4.8 in) | 26 June 1999 |
| Jul | 183.6 mm (7.2 in) | 26 July 2022 |
| Aug | 88.1 mm (3.5 in) | 15 August 2016 |
| Sep | 120.9 mm (4.8 in) | 8 September 2018 |
| Oct | 71.9 mm (2.8 in) | 25 October 2022 |
| Nov | 81.8 mm (3.2 in) | 4 November 2024 |
| Dec | 56.1 mm (2.2 in) | 26 December 2015 |
Period of Record Coverage
1997 to 2025| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1997 | 203 | 56% | No |
| 1998 | 357 | 98% | Yes |
| 1999 | 360 | 99% | Yes |
| 2000 | 361 | 99% | Yes |
| 2001 | 358 | 98% | Yes |
| 2002 | 363 | 99% | Yes |
| 2003 | 364 | 100% | Yes |
| 2004 | 362 | 99% | Yes |
| 2005 | 338 | 93% | Yes |
| 2006 | 360 | 99% | Yes |
| 2007 | 364 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 362 | 99% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 364 | 100% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 364 | 100% | Yes |
| 2014 | 364 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 363 | 99% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 363 | 99% | Yes |
| 2019 | 361 | 99% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 360 | 99% | Yes |
Latest Records
0No records were set at this station in the latest data.
Climate Trend
27 complete years, 1998 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1998 | 14.4 C | +0.69 C |
| 1999 | 13.8 C | +0.05 C |
| 2000 | 12.9 C | -0.89 C |
| 2001 | 13.7 C | -0.06 C |
| 2002 | 13.8 C | +0.05 C |
| 2003 | 13.0 C | -0.77 C |
| 2004 | 13.3 C | -0.44 C |
| 2006 | 14.0 C | +0.24 C |
| 2007 | 14.1 C | +0.32 C |
| 2008 | 12.4 C | -1.32 C |
| 2009 | 12.7 C | -1.00 C |
| 2010 | 13.2 C | -0.59 C |
| 2011 | 13.7 C | -0.01 C |
| 2012 | 15.2 C | +1.46 C |
| 2013 | 12.6 C | -1.10 C |
| 2014 | 12.4 C | -1.36 C |
| 2015 | 14.2 C | +0.42 C |
| 2016 | 15.1 C | +1.33 C |
| 2017 | 15.1 C | +1.32 C |
| 2018 | 13.5 C | -0.22 C |
| 2019 | 13.3 C | -0.42 C |
| 2020 | 13.6 C | -0.14 C |
| 2021 | 13.9 C | +0.12 C |
| 2022 | 13.3 C | -0.46 C |
| 2023 | 14.7 C | +0.97 C |
| 2024 | 15.3 C | +1.60 C |
| 2025 | 14.1 C | +0.34 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| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.7 C (107.1 F) | 2012 | 37.2 C (99.0 F) | 30 |
| Coldest night (TNn) | -25.5 C (-13.9 F) | 2014 | -16.8 C (1.7 F) | 30 |
| Wettest day (Rx1day) | 183.6 mm (7.2 in) | 2022 | 63.0 mm (2.5 in) | 29 |
| Wettest five days (Rx5day) | 228.8 mm (9.0 in) | 2022 | 105.9 mm (4.2 in) | 29 |
| Longest dry spell (CDD) | 41 days | 2005 | 22 days | 29 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1997 | 37.2 C (99.0 F) |
| 1998 | 38.9 C (102.0 F) |
| 1999 | 40.0 C (104.0 F) |
| 2000 | 37.8 C (100.0 F) |
| 2001 | 37.8 C (100.0 F) |
| 2002 | 37.2 C (99.0 F) |
| 2003 | 39.4 C (102.9 F) |
| 2004 | 35.0 C (95.0 F) |
| 2005 | 37.2 C (99.0 F) |
| 2006 | 37.2 C (99.0 F) |
| 2007 | 40.6 C (105.1 F) |
| 2008 | 36.1 C (97.0 F) |
| 2009 | 37.2 C (99.0 F) |
| 2010 | 37.2 C (99.0 F) |
| 2011 | 38.9 C (102.0 F) |
| 2012 | 41.7 C (107.1 F) |
| 2013 | 38.3 C (100.9 F) |
| 2014 | 37.2 C (99.0 F) |
| 2015 | 36.7 C (98.1 F) |
| 2016 | 37.2 C (99.0 F) |
| 2017 | 39.4 C (102.9 F) |
| 2018 | 36.1 C (97.0 F) |
| 2019 | 35.6 C (96.1 F) |
| 2020 | 35.0 C (95.0 F) |
| 2021 | 37.2 C (99.0 F) |
| 2022 | 38.3 C (100.9 F) |
| 2023 | 39.4 C (102.9 F) |
| 2024 | 39.4 C (102.9 F) |
| 2025 | 36.7 C (98.1 F) |
| 2026 | 38.9 C (102.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1997 | -10.0 C (14.0 F) |
| 1998 | -15.0 C (5.0 F) |
| 1999 | -23.3 C (-9.9 F) |
| 2000 | -20.6 C (-5.1 F) |
| 2001 | -21.1 C (-6.0 F) |
| 2002 | -13.9 C (7.0 F) |
| 2003 | -18.3 C (-0.9 F) |
| 2004 | -16.1 C (3.0 F) |
| 2005 | -15.6 C (3.9 F) |
| 2006 | -14.3 C (6.3 F) |
| 2007 | -16.0 C (3.2 F) |
| 2008 | -15.5 C (4.1 F) |
| 2009 | -18.8 C (-1.8 F) |
| 2010 | -20.5 C (-4.9 F) |
| 2011 | -17.7 C (0.1 F) |
| 2012 | -13.2 C (8.2 F) |
| 2013 | -14.3 C (6.3 F) |
| 2014 | -25.5 C (-13.9 F) |
| 2015 | -16.6 C (2.1 F) |
| 2016 | -16.6 C (2.1 F) |
| 2017 | -16.6 C (2.1 F) |
| 2018 | -21.0 C (-5.8 F) |
| 2019 | -19.9 C (-3.8 F) |
| 2020 | -14.3 C (6.3 F) |
| 2021 | -19.3 C (-2.7 F) |
| 2022 | -20.5 C (-4.9 F) |
| 2023 | -11.0 C (12.2 F) |
| 2024 | -20.5 C (-4.9 F) |
| 2025 | -17.1 C (1.2 F) |
| 2026 | -18.9 C (-2.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1997 | n/a |
| 1998 | 85.6 mm (3.4 in) |
| 1999 | 121.9 mm (4.8 in) |
| 2000 | 68.8 mm (2.7 in) |
| 2001 | 34.0 mm (1.3 in) |
| 2002 | 47.5 mm (1.9 in) |
| 2003 | 52.3 mm (2.1 in) |
| 2004 | 64.8 mm (2.6 in) |
| 2005 | 46.7 mm (1.8 in) |
| 2006 | 56.6 mm (2.2 in) |
| 2007 | 36.6 mm (1.4 in) |
| 2008 | 94.0 mm (3.7 in) |
| 2009 | 59.7 mm (2.4 in) |
| 2010 | 56.6 mm (2.2 in) |
| 2011 | 63.0 mm (2.5 in) |
| 2012 | 70.4 mm (2.8 in) |
| 2013 | 79.8 mm (3.1 in) |
| 2014 | 58.4 mm (2.3 in) |
| 2015 | 59.7 mm (2.4 in) |
| 2016 | 88.1 mm (3.5 in) |
| 2017 | 66.0 mm (2.6 in) |
| 2018 | 120.9 mm (4.8 in) |
| 2019 | 56.9 mm (2.2 in) |
| 2020 | 86.6 mm (3.4 in) |
| 2021 | 36.3 mm (1.4 in) |
| 2022 | 183.6 mm (7.2 in) |
| 2023 | 78.2 mm (3.1 in) |
| 2024 | 95.0 mm (3.7 in) |
| 2025 | 63.0 mm (2.5 in) |
| 2026 | 50.0 mm (2.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1997 | n/a |
| 1998 | 97.1 mm (3.8 in) |
| 1999 | 143.0 mm (5.6 in) |
| 2000 | 105.9 mm (4.2 in) |
| 2001 | 79.5 mm (3.1 in) |
| 2002 | 88.4 mm (3.5 in) |
| 2003 | 109.9 mm (4.3 in) |
| 2004 | 102.3 mm (4.0 in) |
| 2005 | 146.0 mm (5.7 in) |
| 2006 | 69.4 mm (2.7 in) |
| 2007 | 69.6 mm (2.7 in) |
| 2008 | 108.2 mm (4.3 in) |
| 2009 | 91.3 mm (3.6 in) |
| 2010 | 86.8 mm (3.4 in) |
| 2011 | 125.3 mm (4.9 in) |
| 2012 | 85.8 mm (3.4 in) |
| 2013 | 97.6 mm (3.8 in) |
| 2014 | 112.1 mm (4.4 in) |
| 2015 | 150.1 mm (5.9 in) |
| 2016 | 129.2 mm (5.1 in) |
| 2017 | 164.9 mm (6.5 in) |
| 2018 | 183.0 mm (7.2 in) |
| 2019 | 98.5 mm (3.9 in) |
| 2020 | 107.8 mm (4.2 in) |
| 2021 | 88.9 mm (3.5 in) |
| 2022 | 228.8 mm (9.0 in) |
| 2023 | 86.4 mm (3.4 in) |
| 2024 | 171.2 mm (6.7 in) |
| 2025 | 120.5 mm (4.7 in) |
| 2026 | 52.0 mm (2.0 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1997 | n/a |
| 1998 | 12 days |
| 1999 | 21 days |
| 2000 | 15 days |
| 2001 | 20 days |
| 2002 | 22 days |
| 2003 | 31 days |
| 2004 | 26 days |
| 2005 | 41 days |
| 2006 | 17 days |
| 2007 | 23 days |
| 2008 | 22 days |
| 2009 | 25 days |
| 2010 | 27 days |
| 2011 | 22 days |
| 2012 | 21 days |
| 2013 | 14 days |
| 2014 | 21 days |
| 2015 | 27 days |
| 2016 | 24 days |
| 2017 | 32 days |
| 2018 | 22 days |
| 2019 | 17 days |
| 2020 | 25 days |
| 2021 | 24 days |
| 2022 | 19 days |
| 2023 | 21 days |
| 2024 | 33 days |
| 2025 | 23 days |
| 2026 | 20 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
27 years with a frostAcross 27 years with a frost, the median last spring frost at Cahokia St Louis Dwtn AP falls on 9 April and the median first autumn frost on 22 October, which leaves a median of 194 days between them.
Fitted over all years, the growing season changes by +3.7 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1998 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 9 April | n/a | 9 April | n/a | +0.8 days per decade |
| First autumn frost | 22 October | n/a | 22 October | n/a | +4.5 days per decade |
| Growing days | 194 days | n/a | 194 days | n/a | +3.7 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.
Download the Data
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).