De Kalb Weather Records (USC00112223)
Record envelope, standing records and threshold days for De Kalb (USC00112223), Illinois, United States, with 61 years of record.
Key Facts for De Kalb
- De Kalb (USC00112223) is a weather station in Illinois, United States at 41.93 latitude and -88.78 longitude, 268 m (878 ft) above sea level.
- The station reports from 1966 to 2026, 61 years of record.
- 1,464 records set at De Kalb still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- De Kalb set a daily record high maximum temperature of 31.1 C (88.0 F) on 13 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Illinois, United States, 41.93 latitude, -88.78 longitude.
- Elevation: 268 m (878 ft).
- Period of record: 1966 to 2026, 61 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
11 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 17.2 C (63.0 F) | -32.8 C (-27.0 F) | 14.4 C (57.9 F) | -25.6 C (-14.1 F) |
| Feb | 23.9 C (75.0 F) | -32.2 C (-26.0 F) | 19.4 C (66.9 F) | -15.6 C (3.9 F) |
| Mar | 28.9 C (84.0 F) | -25.0 C (-13.0 F) | 26.7 C (80.1 F) | -14.4 C (6.1 F) |
| Apr | 33.3 C (91.9 F) | -13.3 C (8.1 F) | 27.2 C (81.0 F) | -2.8 C (27.0 F) |
| May | 35.6 C (96.1 F) | -4.4 C (24.1 F) | 31.1 C (88.0 F) | -0.6 C (30.9 F) |
| Jun | 38.3 C (100.9 F) | 1.1 C (34.0 F) | 32.8 C (91.0 F) | 10.0 C (50.0 F) |
| Jul | 38.9 C (102.0 F) | 6.1 C (43.0 F) | 33.3 C (91.9 F) | 13.3 C (55.9 F) |
| Aug | 39.4 C (102.9 F) | 3.9 C (39.0 F) | 30.0 C (86.0 F) | 12.8 C (55.0 F) |
| Sep | 34.4 C (93.9 F) | -2.8 C (27.0 F) | 35.0 C (95.0 F) | 7.8 C (46.0 F) |
| Oct | 31.7 C (89.1 F) | -10.6 C (12.9 F) | 31.1 C (88.0 F) | 7.8 C (46.0 F) |
| Nov | 24.4 C (75.9 F) | -22.2 C (-8.0 F) | n/a | n/a |
| Dec | 20.6 C (69.1 F) | -30.0 C (-22.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1966 | 23 |
| 1967 | 34 |
| 1968 | 20 |
| 1969 | 17 |
| 1970 | 28 |
| 1971 | 30 |
| 1972 | 21 |
| 1973 | 21 |
| 1974 | 29 |
| 1975 | 30 |
| 1976 | 37 |
| 1977 | 30 |
| 1978 | 24 |
| 1979 | 32 |
| 1980 | 20 |
| 1981 | 21 |
| 1982 | 24 |
| 1983 | 42 |
| 1984 | 25 |
| 1985 | 19 |
| 1986 | 28 |
| 1987 | 20 |
| 1988 | 61 |
| 1989 | 26 |
| 1990 | 29 |
| 1991 | 39 |
| 1992 | 32 |
| 1993 | 11 |
| 1994 | 22 |
| 1995 | 22 |
| 1996 | 26 |
| 1997 | 24 |
| 1998 | 18 |
| 1999 | 19 |
| 2000 | 33 |
| 2001 | 21 |
| 2002 | 22 |
| 2003 | 14 |
| 2004 | 13 |
| 2005 | 24 |
| 2006 | 23 |
| 2007 | 21 |
| 2008 | 15 |
| 2009 | 19 |
| 2010 | 11 |
| 2011 | 15 |
| 2012 | 44 |
| 2013 | 22 |
| 2014 | 37 |
| 2015 | 24 |
| 2016 | 10 |
| 2017 | 37 |
| 2018 | 23 |
| 2019 | 22 |
| 2020 | 13 |
| 2021 | 19 |
| 2022 | 15 |
| 2023 | 17 |
| 2024 | 17 |
| 2025 | 15 |
| 2026 | 14 |
All-Time Record Progression
2 new records| Date | Kind | Detail |
|---|---|---|
| 1996-07-18 | Record daily precipitation | Record daily precipitation 205.5 mm (8.1 in) |
| 2011-02-02 | Record daily snowfall | Record daily snowfall 39.9 cm (15.7 in) |
Wettest Day of Each Month
Jul: 205.5 mm (8.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 38.4 mm (1.5 in) | 17 January 2017 |
| Feb | 66.0 mm (2.6 in) | 21 February 1997 |
| Mar | 49.0 mm (1.9 in) | 28 March 2020 |
| Apr | 101.9 mm (4.0 in) | 18 April 2013 |
| May | 71.4 mm (2.8 in) | 21 May 2004 |
| Jun | 77.7 mm (3.1 in) | 2 June 1970 |
| Jul | 205.5 mm (8.1 in) | 18 July 1996 |
| Aug | 145.0 mm (5.7 in) | 14 August 1987 |
| Sep | 88.1 mm (3.5 in) | 28 September 1999 |
| Oct | 75.7 mm (3.0 in) | 11 October 1969 |
| Nov | 55.9 mm (2.2 in) | 11 November 1995 |
| Dec | 51.6 mm (2.0 in) | 10 December 2003 |
Period of Record Coverage
1966 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1966 | 304 | 83% | No |
| 1967 | 360 | 99% | Yes |
| 1968 | 267 | 73% | No |
| 1969 | 363 | 99% | Yes |
| 1970 | 363 | 99% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 358 | 98% | Yes |
| 1973 | 356 | 98% | Yes |
| 1974 | 356 | 98% | Yes |
| 1975 | 362 | 99% | Yes |
| 1976 | 364 | 99% | Yes |
| 1977 | 364 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 365 | 100% | Yes |
| 1981 | 364 | 100% | Yes |
| 1982 | 327 | 90% | No |
| 1983 | 354 | 97% | Yes |
| 1984 | 362 | 99% | Yes |
| 1985 | 333 | 91% | Yes |
| 1986 | 329 | 90% | Yes |
| 1987 | 332 | 91% | Yes |
| 1988 | 365 | 100% | Yes |
| 1989 | 300 | 82% | No |
| 1990 | 329 | 90% | Yes |
| 1991 | 320 | 88% | No |
| 1992 | 364 | 99% | Yes |
| 1993 | 332 | 91% | Yes |
| 1994 | 360 | 99% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 334 | 91% | Yes |
| 2001 | 364 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 334 | 92% | Yes |
| 2004 | 365 | 100% | Yes |
| 2005 | 330 | 90% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 364 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 363 | 99% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 361 | 99% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 363 | 99% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 329 | 90% | Yes |
| 2022 | 360 | 99% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 365 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 284 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 13 October 2026 | De Kalb, US | daily high max (Provisional) | 31.1 C (88.0 F) | 1.1 C (2.0 F) | 51 years | 22 of 100 (Routine) |
| 13 October 2026 | De Kalb, US | daily high min (Provisional) | 16.7 C (62.1 F) | 0.6 C (1.1 F) | 51 years | 22 of 100 (Routine) |
| 2 October 2026 | De Kalb, US | daily rain (Provisional) | 36.6 mm (1.4 in) | 8.7 mm (0.34 in) | 8 years | 16 of 100 (Routine) |
| 5 September 2026 | De Kalb, US | daily high min (Provisional) | 22.8 C (73.0 F) | 0.6 C (1.1 F) | 43 years | 19 of 100 (Routine) |
| 4 September 2026 | De Kalb, US | monthly high min (Tie, Provisional) | 23.9 C (75.0 F) | tie | 0 years | 4 of 100 (Routine) |
| 3 September 2026 | De Kalb, US | monthly high min (Provisional) | 23.9 C (75.0 F) | 1.1 C (2.0 F) | 52 years | 33 of 100 (Routine) |
| 3 September 2026 | De Kalb, US | monthly high max (Provisional) | 35.0 C (95.0 F) | 0.6 C (1.1 F) | 47 years | 31 of 100 (Routine) |
| 2 September 2026 | De Kalb, US | monthly high min (Tie, Provisional) | 22.8 C (73.0 F) | tie | 52 years | 7 of 100 (Routine) |
| 2 September 2026 | De Kalb, US | daily high max (Tie, Provisional) | 33.9 C (93.0 F) | tie | 25 years | 3 of 100 (Routine) |
| 1 September 2026 | De Kalb, US | daily high min (Provisional) | 21.7 C (71.1 F) | 1.1 C (2.0 F) | 25 years | 15 of 100 (Routine) |
| 11 August 2026 | De Kalb, US | daily high min (Tie) | 22.2 C (72.0 F) | tie | 37 years | 4 of 100 (Routine) |
| 1 August 2026 | De Kalb, US | daily rain | 23.9 mm (0.9 in) | 8.4 mm (0.33 in) | 23 years | 17 of 100 (Routine) |
| 18 July 2026 | De Kalb, US | daily high min (Tie) | 23.9 C (75.0 F) | tie | 12 years | 2 of 100 (Routine) |
| 1 July 2026 | De Kalb, US | daily high min (Tie) | 23.9 C (75.0 F) | tie | 8 years | 2 of 100 (Routine) |
| 30 June 2026 | De Kalb, US | daily high min | 23.9 C (75.0 F) | 1.1 C (2.0 F) | 56 years | 24 of 100 (Routine) |
| 10 June 2026 | De Kalb, US | daily high min | 22.2 C (72.0 F) | 1.1 C (2.0 F) | 41 years | 20 of 100 (Routine) |
| 18 March 2026 | De Kalb, US | daily low min | -14.4 C (6.1 F) | 1.6 C (2.9 F) | 59 years | 25 of 100 (Routine) |
| 18 March 2026 | De Kalb, US | daily low max | -5.0 C (23.0 F) | 1.1 C (2.0 F) | 32 years | 16 of 100 (Routine) |
| 17 March 2026 | De Kalb, US | daily low min | -13.9 C (7.0 F) | 1.7 C (3.1 F) | 59 years | 25 of 100 (Routine) |
| 17 March 2026 | De Kalb, US | daily snow depth (Tie) | 7.6 cm (3.0 in) | tie | 24 years | 3 of 100 (Routine) |
Climate Trend
46 complete years, 1967 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1967 | 8.7 C | -0.61 C |
| 1969 | 8.8 C | -0.46 C |
| 1970 | 9.6 C | +0.25 C |
| 1971 | 9.5 C | +0.17 C |
| 1972 | 8.5 C | -0.78 C |
| 1973 | 10.5 C | +1.22 C |
| 1974 | 9.5 C | +0.18 C |
| 1975 | 9.7 C | +0.36 C |
| 1976 | 8.8 C | -0.55 C |
| 1977 | 9.5 C | +0.20 C |
| 1978 | 8.8 C | -0.47 C |
| 1979 | 8.6 C | -0.66 C |
| 1980 | 9.3 C | +0.03 C |
| 1981 | 10.0 C | +0.72 C |
| 1983 | 10.2 C | +0.94 C |
| 1984 | 10.0 C | +0.68 C |
| 1988 | 8.7 C | -0.56 C |
| 1992 | 8.7 C | -0.56 C |
| 1994 | 9.2 C | -0.15 C |
| 1995 | 8.8 C | -0.54 C |
| 1996 | 7.6 C | -1.69 C |
| 1997 | 8.3 C | -0.98 C |
| 1998 | 11.1 C | +1.76 C |
| 1999 | 9.8 C | +0.53 C |
| 2001 | 9.7 C | +0.42 C |
| 2002 | 9.6 C | +0.31 C |
| 2004 | 9.1 C | -0.19 C |
| 2006 | 10.0 C | +0.72 C |
| 2007 | 9.5 C | +0.22 C |
| 2008 | 7.9 C | -1.38 C |
| 2009 | 8.2 C | -1.12 C |
| 2010 | 9.6 C | +0.32 C |
| 2011 | 9.3 C | 0.00 C |
| 2012 | 11.1 C | +1.75 C |
| 2013 | 8.2 C | -1.12 C |
| 2014 | 7.3 C | -2.05 C |
| 2015 | 9.2 C | -0.08 C |
| 2016 | 10.4 C | +1.10 C |
| 2017 | 9.9 C | +0.56 C |
| 2018 | 8.9 C | -0.44 C |
| 2019 | 8.5 C | -0.77 C |
| 2020 | 9.5 C | +0.23 C |
| 2022 | 8.6 C | -0.73 C |
| 2023 | 10.3 C | +1.02 C |
| 2024 | 11.1 C | +1.80 C |
| 2025 | 9.8 C | +0.52 C |
The fitted trend in annual mean temperature here over 1967 to 2025 is 0.03 C (-0.11 to 0.18) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.3) per decade. The slope is a straight line fitted to 46 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.03 C (-0.11 to 0.18) per decade | 0.1 F (-0.2 to 0.3) per decade | 1967 to 2025 | 46 | Not clearly different from zero |
| Mean daily maximum | -0.1 C (-0.2 to 0.1) per decade | -0.1 F (-0.4 to 0.2) per decade | 1967 to 2025 | 46 | Not clearly different from zero |
| Mean daily minimum | 0.12 C (-0.04 to 0.27) per decade | 0.2 F (-0.1 to 0.5) per decade | 1967 to 2025 | 46 | Not clearly different from zero |
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
1966 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 39.4 C (102.9 F) | 1988 | 35.0 C (95.0 F) | 61 |
| Coldest night (TNn) | -32.8 C (-27.0 F) | 1985 | -25.0 C (-13.0 F) | 61 |
| Wettest day (Rx1day) | 205.5 mm (8.1 in) | 1996 | 59.9 mm (2.4 in) | 61 |
| Wettest five days (Rx5day) | 219.3 mm (8.6 in) | 1996 | 99.5 mm (3.9 in) | 61 |
| Longest dry spell (CDD) | 45 days | 1999 | 20 days | 61 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1966 | 38.3 C (100.9 F) |
| 1967 | 32.8 C (91.0 F) |
| 1968 | 35.0 C (95.0 F) |
| 1969 | 32.8 C (91.0 F) |
| 1970 | 36.1 C (97.0 F) |
| 1971 | 35.0 C (95.0 F) |
| 1972 | 34.4 C (93.9 F) |
| 1973 | 34.4 C (93.9 F) |
| 1974 | 35.6 C (96.1 F) |
| 1975 | 34.4 C (93.9 F) |
| 1976 | 35.0 C (95.0 F) |
| 1977 | 35.6 C (96.1 F) |
| 1978 | 34.4 C (93.9 F) |
| 1979 | 33.3 C (91.9 F) |
| 1980 | 35.6 C (96.1 F) |
| 1981 | 35.0 C (95.0 F) |
| 1982 | 32.2 C (90.0 F) |
| 1983 | 36.7 C (98.1 F) |
| 1984 | 35.6 C (96.1 F) |
| 1985 | 35.0 C (95.0 F) |
| 1986 | 33.9 C (93.0 F) |
| 1987 | 35.6 C (96.1 F) |
| 1988 | 39.4 C (102.9 F) |
| 1989 | 36.7 C (98.1 F) |
| 1990 | 35.6 C (96.1 F) |
| 1991 | 37.2 C (99.0 F) |
| 1992 | 33.3 C (91.9 F) |
| 1993 | 33.9 C (93.0 F) |
| 1994 | 36.1 C (97.0 F) |
| 1995 | 38.9 C (102.0 F) |
| 1996 | 34.4 C (93.9 F) |
| 1997 | 35.6 C (96.1 F) |
| 1998 | 35.0 C (95.0 F) |
| 1999 | 37.2 C (99.0 F) |
| 2000 | 33.9 C (93.0 F) |
| 2001 | 35.6 C (96.1 F) |
| 2002 | 36.1 C (97.0 F) |
| 2003 | 36.1 C (97.0 F) |
| 2004 | 32.2 C (90.0 F) |
| 2005 | 37.2 C (99.0 F) |
| 2006 | 36.1 C (97.0 F) |
| 2007 | 32.8 C (91.0 F) |
| 2008 | 32.8 C (91.0 F) |
| 2009 | 35.0 C (95.0 F) |
| 2010 | 33.3 C (91.9 F) |
| 2011 | 36.1 C (97.0 F) |
| 2012 | 38.3 C (100.9 F) |
| 2013 | 34.4 C (93.9 F) |
| 2014 | 32.2 C (90.0 F) |
| 2015 | 32.8 C (91.0 F) |
| 2016 | 33.3 C (91.9 F) |
| 2017 | 33.9 C (93.0 F) |
| 2018 | 35.6 C (96.1 F) |
| 2019 | 35.0 C (95.0 F) |
| 2020 | 33.9 C (93.0 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 35.6 C (96.1 F) |
| 2023 | 35.0 C (95.0 F) |
| 2024 | 34.4 C (93.9 F) |
| 2025 | 33.9 C (93.0 F) |
| 2026 | 35.0 C (95.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1966 | -18.3 C (-0.9 F) |
| 1967 | -26.1 C (-15.0 F) |
| 1968 | -26.1 C (-15.0 F) |
| 1969 | -23.9 C (-11.0 F) |
| 1970 | -28.3 C (-18.9 F) |
| 1971 | -23.9 C (-11.0 F) |
| 1972 | -27.8 C (-18.0 F) |
| 1973 | -21.1 C (-6.0 F) |
| 1974 | -26.7 C (-16.1 F) |
| 1975 | -23.9 C (-11.0 F) |
| 1976 | -25.0 C (-13.0 F) |
| 1977 | -28.9 C (-20.0 F) |
| 1978 | -25.0 C (-13.0 F) |
| 1979 | -30.0 C (-22.0 F) |
| 1980 | -22.2 C (-8.0 F) |
| 1981 | -23.3 C (-9.9 F) |
| 1982 | -31.7 C (-25.1 F) |
| 1983 | -30.0 C (-22.0 F) |
| 1984 | -30.0 C (-22.0 F) |
| 1985 | -32.8 C (-27.0 F) |
| 1986 | -21.7 C (-7.1 F) |
| 1987 | -22.8 C (-9.0 F) |
| 1988 | -28.3 C (-18.9 F) |
| 1989 | -22.2 C (-8.0 F) |
| 1990 | -22.8 C (-9.0 F) |
| 1991 | -22.2 C (-8.0 F) |
| 1992 | -22.8 C (-9.0 F) |
| 1993 | -23.3 C (-9.9 F) |
| 1994 | -31.1 C (-24.0 F) |
| 1995 | -21.1 C (-6.0 F) |
| 1996 | -30.6 C (-23.1 F) |
| 1997 | -25.0 C (-13.0 F) |
| 1998 | -21.1 C (-6.0 F) |
| 1999 | -29.4 C (-20.9 F) |
| 2000 | -24.4 C (-11.9 F) |
| 2001 | -21.7 C (-7.1 F) |
| 2002 | -25.0 C (-13.0 F) |
| 2003 | -21.7 C (-7.1 F) |
| 2004 | -25.0 C (-13.0 F) |
| 2005 | -21.7 C (-7.1 F) |
| 2006 | -18.9 C (-2.0 F) |
| 2007 | -25.0 C (-13.0 F) |
| 2008 | -26.1 C (-15.0 F) |
| 2009 | -30.6 C (-23.1 F) |
| 2010 | -23.3 C (-9.9 F) |
| 2011 | -25.0 C (-13.0 F) |
| 2012 | -17.8 C (0.0 F) |
| 2013 | -23.3 C (-9.9 F) |
| 2014 | -28.3 C (-18.9 F) |
| 2015 | -24.4 C (-11.9 F) |
| 2016 | -25.6 C (-14.1 F) |
| 2017 | -23.3 C (-9.9 F) |
| 2018 | -26.1 C (-15.0 F) |
| 2019 | -32.2 C (-26.0 F) |
| 2020 | -23.9 C (-11.0 F) |
| 2021 | -26.1 C (-15.0 F) |
| 2022 | -26.7 C (-16.1 F) |
| 2023 | -21.7 C (-7.1 F) |
| 2024 | -27.2 C (-17.0 F) |
| 2025 | -25.0 C (-13.0 F) |
| 2026 | -25.6 C (-14.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1966 | 54.6 mm (2.1 in) |
| 1967 | 41.9 mm (1.6 in) |
| 1968 | 54.9 mm (2.2 in) |
| 1969 | 75.7 mm (3.0 in) |
| 1970 | 77.7 mm (3.1 in) |
| 1971 | 39.9 mm (1.6 in) |
| 1972 | 65.3 mm (2.6 in) |
| 1973 | 49.0 mm (1.9 in) |
| 1974 | 55.6 mm (2.2 in) |
| 1975 | 39.1 mm (1.5 in) |
| 1976 | 55.1 mm (2.2 in) |
| 1977 | 59.2 mm (2.3 in) |
| 1978 | 80.5 mm (3.2 in) |
| 1979 | 70.9 mm (2.8 in) |
| 1980 | 55.1 mm (2.2 in) |
| 1981 | 70.9 mm (2.8 in) |
| 1982 | 159.0 mm (6.3 in) |
| 1983 | 78.7 mm (3.1 in) |
| 1984 | 31.5 mm (1.2 in) |
| 1985 | 42.4 mm (1.7 in) |
| 1986 | 47.5 mm (1.9 in) |
| 1987 | 145.0 mm (5.7 in) |
| 1988 | 77.5 mm (3.1 in) |
| 1989 | 90.2 mm (3.6 in) |
| 1990 | 46.5 mm (1.8 in) |
| 1991 | 71.6 mm (2.8 in) |
| 1992 | 43.9 mm (1.7 in) |
| 1993 | 78.7 mm (3.1 in) |
| 1994 | 70.6 mm (2.8 in) |
| 1995 | 64.8 mm (2.6 in) |
| 1996 | 205.5 mm (8.1 in) |
| 1997 | 66.0 mm (2.6 in) |
| 1998 | 67.3 mm (2.6 in) |
| 1999 | 88.1 mm (3.5 in) |
| 2000 | 47.0 mm (1.9 in) |
| 2001 | 71.1 mm (2.8 in) |
| 2002 | 59.9 mm (2.4 in) |
| 2003 | 57.7 mm (2.3 in) |
| 2004 | 71.4 mm (2.8 in) |
| 2005 | 42.2 mm (1.7 in) |
| 2006 | 42.7 mm (1.7 in) |
| 2007 | 123.2 mm (4.9 in) |
| 2008 | 87.9 mm (3.5 in) |
| 2009 | 55.9 mm (2.2 in) |
| 2010 | 118.6 mm (4.7 in) |
| 2011 | 51.3 mm (2.0 in) |
| 2012 | 34.8 mm (1.4 in) |
| 2013 | 101.9 mm (4.0 in) |
| 2014 | 68.6 mm (2.7 in) |
| 2015 | 54.6 mm (2.1 in) |
| 2016 | 63.8 mm (2.5 in) |
| 2017 | 74.4 mm (2.9 in) |
| 2018 | 54.6 mm (2.1 in) |
| 2019 | 75.7 mm (3.0 in) |
| 2020 | 64.0 mm (2.5 in) |
| 2021 | 55.6 mm (2.2 in) |
| 2022 | 58.4 mm (2.3 in) |
| 2023 | 46.0 mm (1.8 in) |
| 2024 | 53.3 mm (2.1 in) |
| 2025 | 38.9 mm (1.5 in) |
| 2026 | 50.8 mm (2.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1966 | 72.9 mm (2.9 in) |
| 1967 | 75.7 mm (3.0 in) |
| 1968 | 99.6 mm (3.9 in) |
| 1969 | 139.0 mm (5.5 in) |
| 1970 | 121.5 mm (4.8 in) |
| 1971 | 54.3 mm (2.1 in) |
| 1972 | 155.0 mm (6.1 in) |
| 1973 | 93.7 mm (3.7 in) |
| 1974 | 81.3 mm (3.2 in) |
| 1975 | 83.8 mm (3.3 in) |
| 1976 | 82.6 mm (3.3 in) |
| 1977 | 86.9 mm (3.4 in) |
| 1978 | 190.1 mm (7.5 in) |
| 1979 | 140.2 mm (5.5 in) |
| 1980 | 117.2 mm (4.6 in) |
| 1981 | 93.2 mm (3.7 in) |
| 1982 | 168.9 mm (6.6 in) |
| 1983 | 214.3 mm (8.4 in) |
| 1984 | 61.0 mm (2.4 in) |
| 1985 | 58.2 mm (2.3 in) |
| 1986 | 111.3 mm (4.4 in) |
| 1987 | 208.0 mm (8.2 in) |
| 1988 | 103.1 mm (4.1 in) |
| 1989 | 92.7 mm (3.6 in) |
| 1990 | 60.4 mm (2.4 in) |
| 1991 | 90.9 mm (3.6 in) |
| 1992 | 52.1 mm (2.1 in) |
| 1993 | 118.9 mm (4.7 in) |
| 1994 | 95.2 mm (3.7 in) |
| 1995 | 85.9 mm (3.4 in) |
| 1996 | 219.3 mm (8.6 in) |
| 1997 | 81.7 mm (3.2 in) |
| 1998 | 81.3 mm (3.2 in) |
| 1999 | 114.5 mm (4.5 in) |
| 2000 | 103.4 mm (4.1 in) |
| 2001 | 110.5 mm (4.4 in) |
| 2002 | 108.5 mm (4.3 in) |
| 2003 | 84.1 mm (3.3 in) |
| 2004 | 103.7 mm (4.1 in) |
| 2005 | 66.6 mm (2.6 in) |
| 2006 | 96.3 mm (3.8 in) |
| 2007 | 208.3 mm (8.2 in) |
| 2008 | 152.2 mm (6.0 in) |
| 2009 | 80.0 mm (3.1 in) |
| 2010 | 128.0 mm (5.0 in) |
| 2011 | 91.1 mm (3.6 in) |
| 2012 | 43.0 mm (1.7 in) |
| 2013 | 122.2 mm (4.8 in) |
| 2014 | 118.4 mm (4.7 in) |
| 2015 | 127.1 mm (5.0 in) |
| 2016 | 100.9 mm (4.0 in) |
| 2017 | 163.6 mm (6.4 in) |
| 2018 | 95.3 mm (3.8 in) |
| 2019 | 99.5 mm (3.9 in) |
| 2020 | 130.6 mm (5.1 in) |
| 2021 | 78.4 mm (3.1 in) |
| 2022 | 113.0 mm (4.4 in) |
| 2023 | 61.5 mm (2.4 in) |
| 2024 | 100.8 mm (4.0 in) |
| 2025 | 75.5 mm (3.0 in) |
| 2026 | 88.2 mm (3.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1966 | 19 days |
| 1967 | 23 days |
| 1968 | 19 days |
| 1969 | 18 days |
| 1970 | 15 days |
| 1971 | 23 days |
| 1972 | 16 days |
| 1973 | 20 days |
| 1974 | 15 days |
| 1975 | 13 days |
| 1976 | 26 days |
| 1977 | 18 days |
| 1978 | 15 days |
| 1979 | 32 days |
| 1980 | 21 days |
| 1981 | 30 days |
| 1982 | 18 days |
| 1983 | 14 days |
| 1984 | 17 days |
| 1985 | 12 days |
| 1986 | 22 days |
| 1987 | 14 days |
| 1988 | 31 days |
| 1989 | 18 days |
| 1990 | 16 days |
| 1991 | 28 days |
| 1992 | 20 days |
| 1993 | 18 days |
| 1994 | 20 days |
| 1995 | 34 days |
| 1996 | 18 days |
| 1997 | 18 days |
| 1998 | 23 days |
| 1999 | 45 days |
| 2000 | 16 days |
| 2001 | 19 days |
| 2002 | 18 days |
| 2003 | 27 days |
| 2004 | 20 days |
| 2005 | 24 days |
| 2006 | 16 days |
| 2007 | 15 days |
| 2008 | 14 days |
| 2009 | 26 days |
| 2010 | 21 days |
| 2011 | 13 days |
| 2012 | 21 days |
| 2013 | 18 days |
| 2014 | 22 days |
| 2015 | 23 days |
| 2016 | 23 days |
| 2017 | 20 days |
| 2018 | 13 days |
| 2019 | 14 days |
| 2020 | 20 days |
| 2021 | 21 days |
| 2022 | 17 days |
| 2023 | 23 days |
| 2024 | 22 days |
| 2025 | 22 days |
| 2026 | 28 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
46 years with a frostAcross 46 years with a frost, the median last spring frost at De Kalb falls on 27 April and the median first autumn frost on 14 October, which leaves a median of 169 days between them.
Fitted over all years, the growing season changes by +4.4 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1988 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 27 April | n/a | 25 April | n/a | -2.0 days per decade |
| First autumn frost | 14 October | n/a | 16 October | n/a | +2.4 days per decade |
| Growing days | 169 days | n/a | 177 days | n/a | +4.4 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
55 years, 1967 to 2025A day with at least 60.3 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 192.6 mm (7.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 60.3 mm (2.4 in) | |
| 5 years | 83.6 mm (3.3 in) | |
| 10 years | 102.9 mm (4.1 in) | |
| 25 years | 133.1 mm (5.2 in) | |
| 50 years | 160.4 mm (6.3 in) | |
| 100 years | 192.6 mm (7.6 in) | Longer than the 55 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, 55 years of values from 1967 to 2025.
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: 205.5 mm (8.1 in) in 1996; 159.0 mm (6.3 in) in 1982; 145.0 mm (5.7 in) in 1987.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of De Kalb, at 1988. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1988 ran 0.2 C (0.4 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1988 | -0.2 | -0.4 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2010 to 2025 against 1961 to 1990Over 2010 to 2025, De Kalb had a mean temperature of 9.4 C (49.0 F) and 927.0 mm (36.5 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Park Forest Water (United States, 103 km away), Wheatfield (United States, 165 km away) and Rochester (United States, 234 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Park Forest Water | United States | 103 km (64 mi) | 9.3 C (48.8 F) | 918.3 mm (36.2 in) | 0.47 |
| Wheatfield | United States | 165 km (103 mi) | 9.2 C (48.5 F) | 902.5 mm (35.5 in) | 0.62 |
| Rochester | United States | 234 km (145 mi) | 9.3 C (48.8 F) | 965.4 mm (38.0 in) | 0.64 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-17).