Joliet Weather Records (USC00244506)
Record envelope, standing records and threshold days for Joliet (USC00244506), Montana, United States, with 70 years of record.
Key Facts for Joliet
- Joliet (USC00244506) is a weather station in Montana, United States at 45.47 latitude and -109.01 longitude, 1,170 m (3,838 ft) above sea level.
- The station reports from 1951 to 2020, 70 years of record.
- 1,464 records set at Joliet still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Joliet tied a daily record high maximum temperature of 13.9 C (57.0 F) on 21 December 2020.
About the Station
- Location: Montana, United States, 45.47 latitude, -109.01 longitude.
- Elevation: 1,170 m (3,838 ft).
- Period of record: 1951 to 2020, 70 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 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) | -38.3 C (-36.9 F) | n/a | n/a |
| Feb | 22.8 C (73.0 F) | -37.2 C (-35.0 F) | n/a | n/a |
| Mar | 25.6 C (78.1 F) | -35.6 C (-32.1 F) | n/a | n/a |
| Apr | 30.6 C (87.1 F) | -23.3 C (-9.9 F) | n/a | n/a |
| May | 34.4 C (93.9 F) | -9.4 C (15.1 F) | n/a | n/a |
| Jun | 38.9 C (102.0 F) | -2.8 C (27.0 F) | n/a | n/a |
| Jul | 41.1 C (106.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Aug | 40.0 C (104.0 F) | -1.7 C (28.9 F) | n/a | n/a |
| Sep | 38.3 C (100.9 F) | -7.8 C (18.0 F) | n/a | n/a |
| Oct | 32.8 C (91.0 F) | -23.3 C (-9.9 F) | n/a | n/a |
| Nov | 23.9 C (75.0 F) | -33.3 C (-27.9 F) | n/a | n/a |
| Dec | 20.6 C (69.1 F) | -39.4 C (-38.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1956 | 5 |
| 1957 | 23 |
| 1958 | 24 |
| 1959 | 26 |
| 1960 | 24 |
| 1961 | 27 |
| 1962 | 30 |
| 1963 | 32 |
| 1964 | 14 |
| 1965 | 32 |
| 1966 | 21 |
| 1967 | 19 |
| 1968 | 39 |
| 1969 | 27 |
| 1970 | 16 |
| 1971 | 19 |
| 1972 | 33 |
| 1973 | 20 |
| 1974 | 21 |
| 1975 | 16 |
| 1976 | 12 |
| 1977 | 19 |
| 1978 | 18 |
| 1979 | 9 |
| 1980 | 23 |
| 1981 | 17 |
| 1982 | 19 |
| 1983 | 29 |
| 1984 | 21 |
| 1985 | 37 |
| 1986 | 27 |
| 1987 | 31 |
| 1988 | 39 |
| 1989 | 21 |
| 1990 | 33 |
| 1991 | 19 |
| 1992 | 28 |
| 1993 | 19 |
| 1994 | 22 |
| 1995 | 19 |
| 1996 | 33 |
| 1997 | 28 |
| 1998 | 18 |
| 1999 | 26 |
| 2000 | 17 |
| 2001 | 13 |
| 2002 | 27 |
| 2003 | 35 |
| 2004 | 12 |
| 2005 | 32 |
| 2006 | 14 |
| 2007 | 16 |
| 2008 | 16 |
| 2009 | 27 |
| 2010 | 20 |
| 2011 | 15 |
| 2012 | 16 |
| 2013 | 21 |
| 2014 | 21 |
| 2015 | 17 |
| 2016 | 9 |
| 2017 | 14 |
| 2018 | 23 |
| 2019 | 30 |
| 2020 | 34 |
All-Time Record Progression
3 new records| Date | Kind | Detail |
|---|---|---|
| 1989-02-02 | Record low maximum temperature | Record low maximum temperature -29.4 C (-20.9 F) |
| 1997-04-05 | Record daily snowfall | Record daily snowfall 48.3 cm (19.0 in) |
| 2002-07-13 | Record high maximum temperature | Record high maximum temperature 41.1 C (106.0 F) |
Wettest Day of Each Month
May: 108.0 mm (4.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 24.1 mm (0.9 in) | 26 January 1975 |
| Feb | 16.3 mm (0.6 in) | 18 February 1955 |
| Mar | 33.3 mm (1.3 in) | 23 March 1973 |
| Apr | 52.3 mm (2.1 in) | 25 April 1964 |
| May | 108.0 mm (4.3 in) | 18 May 1978 |
| Jun | 106.7 mm (4.2 in) | 14 June 2001 |
| Jul | 36.8 mm (1.4 in) | 6 July 1994 |
| Aug | 50.8 mm (2.0 in) | 15 August 1987 |
| Sep | 70.9 mm (2.8 in) | 18 September 1978 |
| Oct | 66.0 mm (2.6 in) | 31 October 1974 |
| Nov | 32.3 mm (1.3 in) | 1 November 1957 |
| Dec | 17.8 mm (0.7 in) | 4 December 2013 |
Period of Record Coverage
1956 to 2020| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1956 | 76 | 21% | No |
| 1957 | 359 | 98% | Yes |
| 1958 | 364 | 100% | Yes |
| 1959 | 364 | 100% | Yes |
| 1960 | 364 | 99% | Yes |
| 1961 | 361 | 99% | Yes |
| 1962 | 364 | 100% | Yes |
| 1963 | 359 | 98% | Yes |
| 1964 | 363 | 99% | Yes |
| 1965 | 361 | 99% | Yes |
| 1966 | 356 | 98% | Yes |
| 1967 | 357 | 98% | Yes |
| 1968 | 363 | 99% | Yes |
| 1969 | 355 | 97% | Yes |
| 1970 | 362 | 99% | Yes |
| 1971 | 363 | 99% | Yes |
| 1972 | 362 | 99% | Yes |
| 1973 | 361 | 99% | Yes |
| 1974 | 357 | 98% | Yes |
| 1975 | 350 | 96% | Yes |
| 1976 | 346 | 95% | Yes |
| 1977 | 333 | 91% | Yes |
| 1978 | 352 | 96% | Yes |
| 1979 | 341 | 93% | Yes |
| 1980 | 362 | 99% | Yes |
| 1981 | 349 | 96% | Yes |
| 1982 | 355 | 97% | Yes |
| 1983 | 361 | 99% | Yes |
| 1984 | 365 | 100% | Yes |
| 1985 | 361 | 99% | Yes |
| 1986 | 362 | 99% | Yes |
| 1987 | 361 | 99% | Yes |
| 1988 | 361 | 99% | Yes |
| 1989 | 361 | 99% | Yes |
| 1990 | 319 | 87% | No |
| 1991 | 360 | 99% | Yes |
| 1992 | 360 | 98% | Yes |
| 1993 | 352 | 96% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 272 | 75% | No |
| 1996 | 365 | 100% | Yes |
| 1997 | 351 | 96% | Yes |
| 1998 | 360 | 99% | Yes |
| 1999 | 361 | 99% | Yes |
| 2000 | 361 | 99% | Yes |
| 2001 | 364 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 350 | 96% | Yes |
| 2004 | 365 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 363 | 99% | Yes |
| 2008 | 363 | 99% | Yes |
| 2009 | 326 | 89% | No |
| 2010 | 337 | 92% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 364 | 100% | Yes |
| 2020 | 364 | 99% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 21 December 2020 | Joliet, US | daily high max (Tie) | 13.9 C (57.0 F) | tie | 46 years | 4 of 100 (Routine) |
| 10 December 2020 | Joliet, US | daily high max (Tie) | 16.1 C (61.0 F) | tie | 30 years | 3 of 100 (Routine) |
| 18 November 2020 | Joliet, US | daily high min | 6.7 C (44.1 F) | 2.3 C (4.1 F) | 21 years | 15 of 100 (Routine) |
| 8 November 2020 | Joliet, US | daily snowfall (Tie) | 8.9 cm (3.5 in) | tie | 54 years | 5 of 100 (Routine) |
| 4 November 2020 | Joliet, US | daily high max | 21.7 C (71.1 F) | 0.6 C (1.1 F) | 55 years | 22 of 100 (Routine) |
| 27 October 2020 | Joliet, US | daily low min | -14.4 C (6.1 F) | 1.1 C (2.0 F) | 24 years | 15 of 100 (Routine) |
| 27 October 2020 | Joliet, US | daily low max | -5.0 C (23.0 F) | 4.4 C (7.9 F) | 1 year | 12 of 100 (Routine) |
| 27 October 2020 | Joliet, US | daily snow depth (Tie) | 15.2 cm (6.0 in) | tie | 1 year | 1 of 100 (Routine) |
| 26 October 2020 | Joliet, US | daily low min | -20.6 C (-5.1 F) | 12.3 C (22.1 F) | 50 years | 48 of 100 (Notable) |
| 26 October 2020 | Joliet, US | daily snow depth | 15.2 cm (6.0 in) | 10.1 cm (4.0 in) | 66 years | 39 of 100 (Notable) |
| 26 October 2020 | Joliet, US | monthly low max | -10.0 C (14.0 F) | 1.1 C (2.0 F) | 28 years | 25 of 100 (Routine) |
| 25 October 2020 | Joliet, US | daily snowfall | 7.6 cm (3.0 in) | 5.1 cm (2.0 in) | 69 years | 34 of 100 (Routine) |
| 25 October 2020 | Joliet, US | daily snow depth | 15.2 cm (6.0 in) | 5.0 cm (2.0 in) | 66 years | 32 of 100 (Routine) |
| 25 October 2020 | Joliet, US | daily low max | -5.0 C (23.0 F) | 6.7 C (12.1 F) | 51 years | 30 of 100 (Routine) |
| 25 October 2020 | Joliet, US | daily low min | -14.4 C (6.1 F) | 1.1 C (2.0 F) | 23 years | 14 of 100 (Routine) |
| 24 October 2020 | Joliet, US | daily low min | -18.3 C (-0.9 F) | 8.9 C (16.0 F) | 29 years | 33 of 100 (Routine) |
| 24 October 2020 | Joliet, US | daily snow depth (Tie) | 10.2 cm (4.0 in) | tie | 66 years | 6 of 100 (Routine) |
| 23 October 2020 | Joliet, US | daily low min | -17.8 C (0.0 F) | 7.2 C (13.0 F) | 45 years | 35 of 100 (Notable) |
| 22 October 2020 | Joliet, US | daily rain | 14.7 mm (0.6 in) | 6.8 mm (0.27 in) | 59 years | 20 of 100 (Routine) |
| 22 October 2020 | Joliet, US | daily snow depth | 10.2 cm (4.0 in) | 2.6 cm (1.0 in) | 45 years | 23 of 100 (Routine) |
Climate Trend
58 complete years, 1957 to 2020| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1957 | 7.3 C | -0.36 C |
| 1958 | 8.4 C | +0.78 C |
| 1959 | 7.5 C | -0.13 C |
| 1960 | 7.5 C | -0.12 C |
| 1961 | 7.7 C | +0.10 C |
| 1962 | 7.9 C | +0.24 C |
| 1963 | 8.2 C | +0.59 C |
| 1964 | 7.4 C | -0.25 C |
| 1965 | 7.1 C | -0.54 C |
| 1966 | 7.6 C | -0.02 C |
| 1967 | 7.1 C | -0.53 C |
| 1968 | 6.5 C | -1.11 C |
| 1969 | 7.1 C | -0.53 C |
| 1970 | 7.6 C | +0.01 C |
| 1971 | 7.4 C | -0.23 C |
| 1972 | 7.0 C | -0.65 C |
| 1973 | 7.7 C | +0.07 C |
| 1974 | 8.3 C | +0.69 C |
| 1975 | 6.5 C | -1.09 C |
| 1976 | 8.7 C | +1.08 C |
| 1978 | 6.0 C | -1.60 C |
| 1980 | 8.3 C | +0.67 C |
| 1981 | 9.4 C | +1.76 C |
| 1982 | 6.9 C | -0.70 C |
| 1983 | 8.2 C | +0.59 C |
| 1984 | 7.8 C | +0.19 C |
| 1985 | 6.8 C | -0.84 C |
| 1986 | 8.9 C | +1.25 C |
| 1987 | 9.4 C | +1.73 C |
| 1988 | 9.2 C | +1.61 C |
| 1989 | 7.3 C | -0.29 C |
| 1991 | 8.5 C | +0.89 C |
| 1992 | 8.9 C | +1.22 C |
| 1993 | 6.8 C | -0.80 C |
| 1994 | 8.9 C | +1.29 C |
| 1996 | 5.8 C | -1.80 C |
| 1997 | 8.1 C | +0.45 C |
| 1998 | 8.9 C | +1.24 C |
| 1999 | 9.7 C | +2.03 C |
| 2000 | 8.2 C | +0.57 C |
| 2001 | 8.3 C | +0.66 C |
| 2002 | 6.9 C | -0.69 C |
| 2003 | 8.4 C | +0.78 C |
| 2004 | 8.1 C | +0.45 C |
| 2005 | 7.5 C | -0.10 C |
| 2006 | 8.4 C | +0.76 C |
| 2007 | 8.1 C | +0.46 C |
| 2008 | 6.8 C | -0.79 C |
| 2011 | 6.2 C | -1.44 C |
| 2012 | 8.1 C | +0.47 C |
| 2013 | 6.6 C | -1.03 C |
| 2014 | 6.2 C | -1.42 C |
| 2015 | 7.7 C | +0.06 C |
| 2016 | 7.8 C | +0.18 C |
| 2017 | 6.7 C | -0.90 C |
| 2018 | 5.8 C | -1.81 C |
| 2019 | 5.0 C | -2.64 C |
| 2020 | 7.2 C | -0.41 C |
The fitted trend in annual mean temperature here over 1957 to 2020 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 58 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.1 C (-0.2 to 0.1) per decade | -0.1 F (-0.4 to 0.1) per decade | 1957 to 2020 | 58 | Not clearly different from zero |
| Mean daily maximum | -0.1 C (-0.2 to 0.1) per decade | -0.2 F (-0.4 to 0.1) per decade | 1957 to 2020 | 58 | Not clearly different from zero |
| Mean daily minimum | -0.1 C (-0.2 to 0.1) per decade | -0.1 F (-0.3 to 0.1) per decade | 1957 to 2020 | 58 | 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
1951 to 2020| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.1 C (106.0 F) | 2002 | 37.8 C (100.0 F) | 65 |
| Coldest night (TNn) | -39.4 C (-38.9 F) | 1983 | -31.1 C (-24.0 F) | 65 |
| Wettest day (Rx1day) | 108.0 mm (4.3 in) | 1978 | 33.2 mm (1.3 in) | 70 |
| Wettest five days (Rx5day) | 175.6 mm (6.9 in) | 1978 | 51.4 mm (2.0 in) | 70 |
| Longest dry spell (CDD) | 58 days | 2008 | 28 days | 70 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1951 | n/a |
| 1952 | n/a |
| 1953 | n/a |
| 1954 | n/a |
| 1955 | n/a |
| 1956 | 25.0 C (77.0 F) |
| 1957 | 38.9 C (102.0 F) |
| 1958 | 36.7 C (98.1 F) |
| 1959 | 38.3 C (100.9 F) |
| 1960 | 40.0 C (104.0 F) |
| 1961 | 40.0 C (104.0 F) |
| 1962 | 36.1 C (97.0 F) |
| 1963 | 38.3 C (100.9 F) |
| 1964 | 37.8 C (100.0 F) |
| 1965 | 37.8 C (100.0 F) |
| 1966 | 37.2 C (99.0 F) |
| 1967 | 36.7 C (98.1 F) |
| 1968 | 37.2 C (99.0 F) |
| 1969 | 37.2 C (99.0 F) |
| 1970 | 36.7 C (98.1 F) |
| 1971 | 37.8 C (100.0 F) |
| 1972 | 35.6 C (96.1 F) |
| 1973 | 38.3 C (100.9 F) |
| 1974 | 36.7 C (98.1 F) |
| 1975 | 37.8 C (100.0 F) |
| 1976 | 36.7 C (98.1 F) |
| 1977 | 39.4 C (102.9 F) |
| 1978 | 36.1 C (97.0 F) |
| 1979 | 36.1 C (97.0 F) |
| 1980 | 36.7 C (98.1 F) |
| 1981 | 37.2 C (99.0 F) |
| 1982 | 37.2 C (99.0 F) |
| 1983 | 38.3 C (100.9 F) |
| 1984 | 37.8 C (100.0 F) |
| 1985 | 37.8 C (100.0 F) |
| 1986 | 37.2 C (99.0 F) |
| 1987 | 35.6 C (96.1 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 40.0 C (104.0 F) |
| 1990 | 38.3 C (100.9 F) |
| 1991 | 37.8 C (100.0 F) |
| 1992 | 35.6 C (96.1 F) |
| 1993 | 34.4 C (93.9 F) |
| 1994 | 35.6 C (96.1 F) |
| 1995 | 38.3 C (100.9 F) |
| 1996 | 37.8 C (100.0 F) |
| 1997 | 35.6 C (96.1 F) |
| 1998 | 36.7 C (98.1 F) |
| 1999 | 38.3 C (100.9 F) |
| 2000 | 37.8 C (100.0 F) |
| 2001 | 38.9 C (102.0 F) |
| 2002 | 41.1 C (106.0 F) |
| 2003 | 40.0 C (104.0 F) |
| 2004 | 36.7 C (98.1 F) |
| 2005 | 40.0 C (104.0 F) |
| 2006 | 39.4 C (102.9 F) |
| 2007 | 40.0 C (104.0 F) |
| 2008 | 38.3 C (100.9 F) |
| 2009 | 35.6 C (96.1 F) |
| 2010 | 37.8 C (100.0 F) |
| 2011 | 37.2 C (99.0 F) |
| 2012 | 38.9 C (102.0 F) |
| 2013 | 36.1 C (97.0 F) |
| 2014 | 35.6 C (96.1 F) |
| 2015 | 37.8 C (100.0 F) |
| 2016 | 37.2 C (99.0 F) |
| 2017 | 37.2 C (99.0 F) |
| 2018 | 37.8 C (100.0 F) |
| 2019 | 36.1 C (97.0 F) |
| 2020 | 38.3 C (100.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1951 | n/a |
| 1952 | n/a |
| 1953 | n/a |
| 1954 | n/a |
| 1955 | n/a |
| 1956 | -27.2 C (-17.0 F) |
| 1957 | -35.0 C (-31.0 F) |
| 1958 | -23.9 C (-11.0 F) |
| 1959 | -33.9 C (-29.0 F) |
| 1960 | -30.0 C (-22.0 F) |
| 1961 | -32.2 C (-26.0 F) |
| 1962 | -35.0 C (-31.0 F) |
| 1963 | -36.7 C (-34.1 F) |
| 1964 | -33.9 C (-29.0 F) |
| 1965 | -31.7 C (-25.1 F) |
| 1966 | -30.0 C (-22.0 F) |
| 1967 | -28.9 C (-20.0 F) |
| 1968 | -35.6 C (-32.1 F) |
| 1969 | -32.8 C (-27.0 F) |
| 1970 | -28.3 C (-18.9 F) |
| 1971 | -28.9 C (-20.0 F) |
| 1972 | -35.6 C (-32.1 F) |
| 1973 | -32.2 C (-26.0 F) |
| 1974 | -32.8 C (-27.0 F) |
| 1975 | -28.3 C (-18.9 F) |
| 1976 | -31.1 C (-24.0 F) |
| 1977 | -32.2 C (-26.0 F) |
| 1978 | -32.2 C (-26.0 F) |
| 1979 | -30.6 C (-23.1 F) |
| 1980 | -33.3 C (-27.9 F) |
| 1981 | -35.0 C (-31.0 F) |
| 1982 | -31.7 C (-25.1 F) |
| 1983 | -39.4 C (-38.9 F) |
| 1984 | -30.0 C (-22.0 F) |
| 1985 | -31.7 C (-25.1 F) |
| 1986 | -28.9 C (-20.0 F) |
| 1987 | -26.1 C (-15.0 F) |
| 1988 | -27.8 C (-18.0 F) |
| 1989 | -37.2 C (-35.0 F) |
| 1990 | -36.1 C (-33.0 F) |
| 1991 | -30.0 C (-22.0 F) |
| 1992 | -28.3 C (-18.9 F) |
| 1993 | -28.3 C (-18.9 F) |
| 1994 | -27.2 C (-17.0 F) |
| 1995 | -22.2 C (-8.0 F) |
| 1996 | -36.1 C (-33.0 F) |
| 1997 | -38.3 C (-36.9 F) |
| 1998 | -28.3 C (-18.9 F) |
| 1999 | -22.8 C (-9.0 F) |
| 2000 | -26.7 C (-16.1 F) |
| 2001 | -27.2 C (-17.0 F) |
| 2002 | -26.1 C (-15.0 F) |
| 2003 | -32.2 C (-26.0 F) |
| 2004 | -31.1 C (-24.0 F) |
| 2005 | -30.0 C (-22.0 F) |
| 2006 | -27.8 C (-18.0 F) |
| 2007 | -33.9 C (-29.0 F) |
| 2008 | -31.1 C (-24.0 F) |
| 2009 | -25.6 C (-14.1 F) |
| 2010 | -32.2 C (-26.0 F) |
| 2011 | -29.4 C (-20.9 F) |
| 2012 | -23.9 C (-11.0 F) |
| 2013 | -33.3 C (-27.9 F) |
| 2014 | -33.9 C (-29.0 F) |
| 2015 | -26.7 C (-16.1 F) |
| 2016 | -32.8 C (-27.0 F) |
| 2017 | -31.1 C (-24.0 F) |
| 2018 | -31.7 C (-25.1 F) |
| 2019 | -35.6 C (-32.1 F) |
| 2020 | -23.9 C (-11.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1951 | 16.8 mm (0.7 in) |
| 1952 | 35.6 mm (1.4 in) |
| 1953 | 34.5 mm (1.4 in) |
| 1954 | 16.3 mm (0.6 in) |
| 1955 | 23.9 mm (0.9 in) |
| 1956 | 25.9 mm (1.0 in) |
| 1957 | 52.1 mm (2.1 in) |
| 1958 | 31.2 mm (1.2 in) |
| 1959 | 34.0 mm (1.3 in) |
| 1960 | 28.4 mm (1.1 in) |
| 1961 | 38.4 mm (1.5 in) |
| 1962 | 42.7 mm (1.7 in) |
| 1963 | 25.4 mm (1.0 in) |
| 1964 | 52.3 mm (2.1 in) |
| 1965 | 26.7 mm (1.1 in) |
| 1966 | 32.0 mm (1.3 in) |
| 1967 | 31.8 mm (1.3 in) |
| 1968 | 47.0 mm (1.9 in) |
| 1969 | 83.8 mm (3.3 in) |
| 1970 | 82.6 mm (3.3 in) |
| 1971 | 31.8 mm (1.3 in) |
| 1972 | 27.4 mm (1.1 in) |
| 1973 | 33.3 mm (1.3 in) |
| 1974 | 66.0 mm (2.6 in) |
| 1975 | 41.4 mm (1.6 in) |
| 1976 | 33.0 mm (1.3 in) |
| 1977 | 24.6 mm (1.0 in) |
| 1978 | 108.0 mm (4.3 in) |
| 1979 | 26.4 mm (1.0 in) |
| 1980 | 32.0 mm (1.3 in) |
| 1981 | 58.7 mm (2.3 in) |
| 1982 | 34.8 mm (1.4 in) |
| 1983 | 26.7 mm (1.1 in) |
| 1984 | 37.8 mm (1.5 in) |
| 1985 | 16.8 mm (0.7 in) |
| 1986 | 42.7 mm (1.7 in) |
| 1987 | 64.0 mm (2.5 in) |
| 1988 | 66.5 mm (2.6 in) |
| 1989 | 34.3 mm (1.4 in) |
| 1990 | 24.1 mm (0.9 in) |
| 1991 | 20.3 mm (0.8 in) |
| 1992 | 43.7 mm (1.7 in) |
| 1993 | 29.5 mm (1.2 in) |
| 1994 | 36.8 mm (1.4 in) |
| 1995 | 22.9 mm (0.9 in) |
| 1996 | 40.6 mm (1.6 in) |
| 1997 | 51.3 mm (2.0 in) |
| 1998 | 21.6 mm (0.9 in) |
| 1999 | 24.4 mm (1.0 in) |
| 2000 | 33.5 mm (1.3 in) |
| 2001 | 106.7 mm (4.2 in) |
| 2002 | 28.7 mm (1.1 in) |
| 2003 | 27.2 mm (1.1 in) |
| 2004 | 23.6 mm (0.9 in) |
| 2005 | 21.3 mm (0.8 in) |
| 2006 | 33.8 mm (1.3 in) |
| 2007 | 39.1 mm (1.5 in) |
| 2008 | 30.0 mm (1.2 in) |
| 2009 | 25.1 mm (1.0 in) |
| 2010 | 33.0 mm (1.3 in) |
| 2011 | 83.8 mm (3.3 in) |
| 2012 | 25.4 mm (1.0 in) |
| 2013 | 38.1 mm (1.5 in) |
| 2014 | 45.7 mm (1.8 in) |
| 2015 | 25.4 mm (1.0 in) |
| 2016 | 34.5 mm (1.4 in) |
| 2017 | 36.1 mm (1.4 in) |
| 2018 | 43.2 mm (1.7 in) |
| 2019 | 30.5 mm (1.2 in) |
| 2020 | 29.0 mm (1.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1951 | 34.3 mm (1.4 in) |
| 1952 | 61.7 mm (2.4 in) |
| 1953 | 41.6 mm (1.6 in) |
| 1954 | 25.2 mm (1.0 in) |
| 1955 | 71.0 mm (2.8 in) |
| 1956 | 34.8 mm (1.4 in) |
| 1957 | 86.9 mm (3.4 in) |
| 1958 | 51.3 mm (2.0 in) |
| 1959 | 46.8 mm (1.8 in) |
| 1960 | 37.4 mm (1.5 in) |
| 1961 | 64.1 mm (2.5 in) |
| 1962 | 93.8 mm (3.7 in) |
| 1963 | 50.0 mm (2.0 in) |
| 1964 | 99.0 mm (3.9 in) |
| 1965 | 51.1 mm (2.0 in) |
| 1966 | 43.0 mm (1.7 in) |
| 1967 | 51.4 mm (2.0 in) |
| 1968 | 71.8 mm (2.8 in) |
| 1969 | 110.7 mm (4.4 in) |
| 1970 | 90.5 mm (3.6 in) |
| 1971 | 71.1 mm (2.8 in) |
| 1972 | 46.1 mm (1.8 in) |
| 1973 | 56.5 mm (2.2 in) |
| 1974 | 86.5 mm (3.4 in) |
| 1975 | 97.0 mm (3.8 in) |
| 1976 | 66.2 mm (2.6 in) |
| 1977 | 40.1 mm (1.6 in) |
| 1978 | 175.6 mm (6.9 in) |
| 1979 | 33.5 mm (1.3 in) |
| 1980 | 59.2 mm (2.3 in) |
| 1981 | 87.9 mm (3.5 in) |
| 1982 | 52.9 mm (2.1 in) |
| 1983 | 35.0 mm (1.4 in) |
| 1984 | 67.3 mm (2.6 in) |
| 1985 | 29.0 mm (1.1 in) |
| 1986 | 53.6 mm (2.1 in) |
| 1987 | 74.7 mm (2.9 in) |
| 1988 | 67.5 mm (2.7 in) |
| 1989 | 41.7 mm (1.6 in) |
| 1990 | 29.2 mm (1.1 in) |
| 1991 | 71.3 mm (2.8 in) |
| 1992 | 86.4 mm (3.4 in) |
| 1993 | 51.3 mm (2.0 in) |
| 1994 | 42.7 mm (1.7 in) |
| 1995 | 43.7 mm (1.7 in) |
| 1996 | 73.1 mm (2.9 in) |
| 1997 | 51.3 mm (2.0 in) |
| 1998 | 47.7 mm (1.9 in) |
| 1999 | 28.8 mm (1.1 in) |
| 2000 | 34.0 mm (1.3 in) |
| 2001 | 127.0 mm (5.0 in) |
| 2002 | 51.0 mm (2.0 in) |
| 2003 | 42.5 mm (1.7 in) |
| 2004 | 26.6 mm (1.0 in) |
| 2005 | 56.9 mm (2.2 in) |
| 2006 | 51.9 mm (2.0 in) |
| 2007 | 51.8 mm (2.0 in) |
| 2008 | 79.5 mm (3.1 in) |
| 2009 | 29.9 mm (1.2 in) |
| 2010 | 41.9 mm (1.6 in) |
| 2011 | 116.6 mm (4.6 in) |
| 2012 | 47.5 mm (1.9 in) |
| 2013 | 44.5 mm (1.8 in) |
| 2014 | 65.1 mm (2.6 in) |
| 2015 | 45.5 mm (1.8 in) |
| 2016 | 45.6 mm (1.8 in) |
| 2017 | 61.8 mm (2.4 in) |
| 2018 | 64.3 mm (2.5 in) |
| 2019 | 38.8 mm (1.5 in) |
| 2020 | 41.4 mm (1.6 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1951 | 18 days |
| 1952 | 35 days |
| 1953 | 47 days |
| 1954 | 41 days |
| 1955 | 39 days |
| 1956 | 21 days |
| 1957 | 29 days |
| 1958 | 20 days |
| 1959 | 24 days |
| 1960 | 42 days |
| 1961 | 28 days |
| 1962 | 39 days |
| 1963 | 31 days |
| 1964 | 25 days |
| 1965 | 26 days |
| 1966 | 23 days |
| 1967 | 47 days |
| 1968 | 22 days |
| 1969 | 42 days |
| 1970 | 26 days |
| 1971 | 20 days |
| 1972 | 23 days |
| 1973 | 39 days |
| 1974 | 28 days |
| 1975 | 29 days |
| 1976 | 35 days |
| 1977 | 37 days |
| 1978 | 29 days |
| 1979 | 42 days |
| 1980 | 22 days |
| 1981 | 29 days |
| 1982 | 17 days |
| 1983 | 25 days |
| 1984 | 23 days |
| 1985 | 30 days |
| 1986 | 25 days |
| 1987 | 26 days |
| 1988 | 33 days |
| 1989 | 19 days |
| 1990 | 19 days |
| 1991 | 19 days |
| 1992 | 49 days |
| 1993 | 22 days |
| 1994 | 26 days |
| 1995 | 16 days |
| 1996 | 45 days |
| 1997 | 17 days |
| 1998 | 21 days |
| 1999 | 55 days |
| 2000 | 23 days |
| 2001 | 29 days |
| 2002 | 25 days |
| 2003 | 33 days |
| 2004 | 27 days |
| 2005 | 29 days |
| 2006 | 30 days |
| 2007 | 41 days |
| 2008 | 58 days |
| 2009 | 23 days |
| 2010 | 40 days |
| 2011 | 23 days |
| 2012 | 31 days |
| 2013 | 45 days |
| 2014 | 26 days |
| 2015 | 20 days |
| 2016 | 49 days |
| 2017 | 29 days |
| 2018 | 34 days |
| 2019 | 22 days |
| 2020 | 23 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
58 years with a frostAcross 58 years with a frost, the median last spring frost at Joliet falls on 24 May and the median first autumn frost on 19 September, which leaves a median of 117 days between them.
Fitted over all years, the growing season changes by -0.1 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1987 to 2020) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 24 May | n/a | 22 May | n/a | +0.4 days per decade |
| First autumn frost | 19 September | n/a | 17 September | n/a | +0.3 days per decade |
| Growing days | 117 days | n/a | 116 days | n/a | -0.1 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
66 years, 1952 to 2020A day with at least 33.6 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 122.3 mm (4.8 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 33.6 mm (1.3 in) | |
| 5 years | 47.7 mm (1.9 in) | |
| 10 years | 60.0 mm (2.4 in) | |
| 25 years | 80.0 mm (3.1 in) | |
| 50 years | 99.0 mm (3.9 in) | |
| 100 years | 122.3 mm (4.8 in) | Longer than the 66 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, 66 years of values from 1952 to 2020.
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: 108.0 mm (4.3 in) in 1978; 106.7 mm (4.2 in) in 2001; 83.8 mm (3.3 in) in 1969.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Joliet, at 2011. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2011 ran 0.4 C (0.8 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 2011 | -0.4 | -0.8 | 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
2004 to 2020 against 1961 to 1990Over 2004 to 2020, Joliet had a mean temperature of 7.1 C (44.8 F) and 383.1 mm (15.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Echo Dam (United States, 538 km away), Arbon 2 NW (United States, 436 km away) and Billy Creek (United States, 234 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Echo Dam | United States | 538 km (334 mi) | 7.2 C (44.9 F) | 379.7 mm (14.9 in) | 0.68 |
| Arbon 2 NW | United States | 436 km (271 mi) | 6.9 C (44.5 F) | 403.4 mm (15.9 in) | 0.69 |
| Billy Creek | United States | 234 km (145 mi) | 7.0 C (44.5 F) | 311.0 mm (12.2 in) | 0.77 |
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 (2025-12-31).