Riito Weather Records (MXN00026076)
Record envelope, standing records and threshold days for Riito (MXN00026076), Mexico, with 62 years of record.
Key Facts for Riito
- Riito (MXN00026076) is a weather station in Mexico at 32.13 latitude and -114.90 longitude, 16 m (52 ft) above sea level.
- The station reports from 1949 to 2010, 62 years of record.
- 1,464 records set at Riito still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Riito set a daily record high maximum temperature of 47.8 C (118.0 F) on 31 August 2010.
About the Station
- Location: Mexico, 32.13 latitude, -114.90 longitude.
- Elevation: 16 m (52 ft).
- Period of record: 1949 to 2010, 62 years.
- Eligible elements: tmax, tmin, prcp.
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 | 30.6 C (87.1 F) | -6.7 C (19.9 F) | n/a | n/a |
| Feb | 35.6 C (96.1 F) | -5.6 C (21.9 F) | n/a | n/a |
| Mar | 38.9 C (102.0 F) | -3.9 C (25.0 F) | n/a | n/a |
| Apr | 42.8 C (109.0 F) | 1.7 C (35.1 F) | n/a | n/a |
| May | 48.9 C (120.0 F) | 4.4 C (39.9 F) | n/a | n/a |
| Jun | 50.0 C (122.0 F) | 3.9 C (39.0 F) | n/a | n/a |
| Jul | 56.1 C (133.0 F) | 4.4 C (39.9 F) | n/a | n/a |
| Aug | 49.4 C (120.9 F) | 4.4 C (39.9 F) | n/a | n/a |
| Sep | 47.8 C (118.0 F) | 0.6 C (33.1 F) | n/a | n/a |
| Oct | 50.0 C (122.0 F) | -1.1 C (30.0 F) | n/a | n/a |
| Nov | 47.8 C (118.0 F) | -2.8 C (27.0 F) | n/a | n/a |
| Dec | 40.6 C (105.1 F) | -6.1 C (21.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1949 | 17 |
| 1950 | 24 |
| 1951 | 17 |
| 1952 | 14 |
| 1953 | 22 |
| 1954 | 15 |
| 1955 | 26 |
| 1956 | 25 |
| 1957 | 61 |
| 1958 | 70 |
| 1959 | 16 |
| 1960 | 20 |
| 1961 | 14 |
| 1962 | 29 |
| 1963 | 26 |
| 1964 | 27 |
| 1965 | 18 |
| 1966 | 19 |
| 1967 | 19 |
| 1968 | 22 |
| 1969 | 24 |
| 1970 | 11 |
| 1971 | 33 |
| 1972 | 26 |
| 1973 | 15 |
| 1974 | 8 |
| 1975 | 23 |
| 1976 | 9 |
| 1977 | 13 |
| 1978 | 12 |
| 1979 | 12 |
| 1980 | 10 |
| 1981 | 147 |
| 1982 | 19 |
| 1983 | 7 |
| 1984 | 9 |
| 1985 | 20 |
| 1986 | 16 |
| 1987 | 20 |
| 1988 | 11 |
| 1989 | 12 |
| 1990 | 30 |
| 1991 | 20 |
| 1992 | 21 |
| 1993 | 27 |
| 1994 | 19 |
| 1995 | 29 |
| 1996 | 18 |
| 1997 | 26 |
| 1998 | 16 |
| 1999 | 3 |
| 2000 | 11 |
| 2001 | 30 |
| 2002 | 46 |
| 2003 | 25 |
| 2004 | 20 |
| 2005 | 38 |
| 2006 | 22 |
| 2007 | 49 |
| 2008 | 20 |
| 2009 | 26 |
| 2010 | 10 |
Wettest Day of Each Month
Sep: 79.8 mm (3.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 28.2 mm (1.1 in) | 16 January 1979 |
| Feb | 30.0 mm (1.2 in) | 2 February 1983 |
| Mar | 46.0 mm (1.8 in) | 6 March 2001 |
| Apr | 18.8 mm (0.7 in) | 21 April 1957 |
| May | 29.0 mm (1.1 in) | 10 May 1957 |
| Jun | 15.0 mm (0.6 in) | 10 June 1981 |
| Jul | 19.8 mm (0.8 in) | 5 July 1968 |
| Aug | 48.8 mm (1.9 in) | 23 August 1955 |
| Sep | 79.8 mm (3.1 in) | 1 September 1967 |
| Oct | 68.3 mm (2.7 in) | 6 October 1972 |
| Nov | 45.0 mm (1.8 in) | 9 November 1969 |
| Dec | 25.9 mm (1.0 in) | 24 December 1959 |
Period of Record Coverage
1949 to 2010| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1949 | 195 | 53% | No |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 324 | 89% | No |
| 1955 | 365 | 100% | Yes |
| 1956 | 362 | 99% | Yes |
| 1957 | 360 | 99% | Yes |
| 1958 | 359 | 98% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 362 | 99% | Yes |
| 1963 | 292 | 80% | No |
| 1964 | 363 | 99% | Yes |
| 1965 | 362 | 99% | Yes |
| 1966 | 330 | 90% | Yes |
| 1967 | 364 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 364 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 363 | 99% | Yes |
| 1975 | 363 | 99% | Yes |
| 1976 | 364 | 99% | Yes |
| 1977 | 364 | 100% | Yes |
| 1978 | 358 | 98% | Yes |
| 1979 | 346 | 95% | Yes |
| 1980 | 350 | 96% | Yes |
| 1981 | 282 | 77% | No |
| 1982 | 365 | 100% | Yes |
| 1983 | 364 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 359 | 98% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 354 | 97% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 302 | 83% | No |
| 1990 | 336 | 92% | Yes |
| 1991 | 364 | 100% | Yes |
| 1992 | 360 | 98% | Yes |
| 1993 | 166 | 45% | No |
| 1994 | 326 | 89% | No |
| 1995 | 361 | 99% | Yes |
| 1996 | 360 | 98% | Yes |
| 1997 | 337 | 92% | Yes |
| 1998 | 326 | 89% | No |
| 1999 | 212 | 58% | No |
| 2000 | 364 | 99% | Yes |
| 2001 | 363 | 99% | Yes |
| 2002 | 298 | 82% | No |
| 2003 | 295 | 81% | No |
| 2004 | 363 | 99% | Yes |
| 2005 | 357 | 98% | Yes |
| 2006 | 360 | 99% | Yes |
| 2007 | 363 | 99% | Yes |
| 2008 | 325 | 89% | No |
| 2009 | 361 | 99% | Yes |
| 2010 | 334 | 92% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 31 August 2010 | Riito, MX | daily high max | 47.8 C (118.0 F) | 1.7 C (3.1 F) | 60 years | 28 of 100 (Routine) |
| 29 August 2010 | Riito, MX | daily low min | 15.6 C (60.1 F) | 0.5 C (0.9 F) | 56 years | 24 of 100 (Routine) |
| 27 August 2010 | Riito, MX | daily high max | 47.8 C (118.0 F) | 1.1 C (2.0 F) | 40 years | 21 of 100 (Routine) |
| 24 July 2010 | Riito, MX | daily high max (Tie) | 45.6 C (114.1 F) | tie | 20 years | 3 of 100 (Routine) |
| 23 July 2010 | Riito, MX | all-time high min (Tie) | 32.8 C (91.0 F) | tie | 38 years | 9 of 100 (Routine) |
| 16 July 2010 | Riito, MX | daily high min (Tie) | 28.9 C (84.0 F) | tie | 55 years | 5 of 100 (Routine) |
| 3 July 2010 | Riito, MX | daily high min | 28.9 C (84.0 F) | 1.7 C (3.1 F) | 56 years | 27 of 100 (Routine) |
| 24 May 2010 | Riito, MX | daily low max | 22.8 C (73.0 F) | 3.3 C (5.9 F) | 28 years | 21 of 100 (Routine) |
| 23 April 2010 | Riito, MX | daily low max | 20.0 C (68.0 F) | 2.8 C (5.0 F) | 29 years | 20 of 100 (Routine) |
| 22 April 2010 | Riito, MX | daily low max (Tie) | 20.6 C (69.1 F) | tie | 40 years | 4 of 100 (Routine) |
| 10 March 2010 | Riito, MX | daily low max | 16.7 C (62.1 F) | 2.2 C (4.0 F) | 43 years | 22 of 100 (Routine) |
| 8 March 2010 | Riito, MX | daily low max | 15.6 C (60.1 F) | 1.1 C (2.0 F) | 57 years | 25 of 100 (Routine) |
| 20 February 2010 | Riito, MX | daily high max | 32.8 C (91.0 F) | 2.2 C (4.0 F) | 38 years | 22 of 100 (Routine) |
| 2 January 2010 | Riito, MX | daily high max (Tie) | 26.7 C (80.1 F) | tie | 14 years | 2 of 100 (Routine) |
| 1 January 2010 | Riito, MX | daily high max (Tie) | 28.9 C (84.0 F) | tie | 14 years | 2 of 100 (Routine) |
| 20 December 2009 | Riito, MX | daily high min (Tie) | 10.0 C (50.0 F) | tie | 56 years | 5 of 100 (Routine) |
| 19 December 2009 | Riito, MX | daily high min | 15.0 C (59.0 F) | 3.3 C (5.9 F) | 18 years | 20 of 100 (Routine) |
| 29 November 2009 | Riito, MX | daily high min | 16.7 C (62.1 F) | 1.7 C (3.1 F) | 14 years | 14 of 100 (Routine) |
| 29 November 2009 | Riito, MX | daily high max | 36.7 C (98.1 F) | 1.1 C (2.0 F) | 3 years | 8 of 100 (Routine) |
| 28 November 2009 | Riito, MX | daily high max | 35.6 C (96.1 F) | 3.9 C (7.0 F) | 3 years | 14 of 100 (Routine) |
Climate Trend
46 complete years, 1950 to 2009| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1950 | 21.9 C | +0.11 C |
| 1951 | 21.5 C | -0.29 C |
| 1952 | 21.7 C | -0.07 C |
| 1953 | 21.4 C | -0.39 C |
| 1955 | 21.0 C | -0.80 C |
| 1956 | 21.3 C | -0.46 C |
| 1957 | 23.5 C | +1.72 C |
| 1958 | 23.4 C | +1.58 C |
| 1959 | 21.9 C | +0.09 C |
| 1960 | 21.3 C | -0.46 C |
| 1961 | 20.9 C | -0.86 C |
| 1962 | 21.3 C | -0.53 C |
| 1964 | 20.6 C | -1.16 C |
| 1965 | 21.1 C | -0.72 C |
| 1967 | 20.8 C | -0.97 C |
| 1968 | 20.7 C | -1.11 C |
| 1969 | 20.6 C | -1.14 C |
| 1970 | 20.4 C | -1.40 C |
| 1971 | 20.4 C | -1.38 C |
| 1972 | 21.1 C | -0.68 C |
| 1973 | 20.3 C | -1.44 C |
| 1974 | 21.1 C | -0.67 C |
| 1975 | 20.2 C | -1.55 C |
| 1976 | 20.9 C | -0.91 C |
| 1977 | 21.6 C | -0.19 C |
| 1978 | 21.6 C | -0.22 C |
| 1979 | 21.1 C | -0.70 C |
| 1980 | 21.7 C | -0.09 C |
| 1982 | 20.0 C | -1.77 C |
| 1983 | 21.0 C | -0.83 C |
| 1984 | 20.8 C | -0.94 C |
| 1985 | 20.8 C | -0.98 C |
| 1986 | 21.4 C | -0.41 C |
| 1987 | 21.4 C | -0.43 C |
| 1988 | 21.9 C | +0.10 C |
| 1991 | 21.9 C | +0.12 C |
| 1992 | 22.2 C | +0.41 C |
| 1995 | 23.8 C | +1.97 C |
| 1996 | 23.9 C | +2.08 C |
| 2000 | 23.6 C | +1.80 C |
| 2001 | 24.5 C | +2.70 C |
| 2004 | 23.1 C | +1.35 C |
| 2005 | 25.2 C | +3.42 C |
| 2006 | 24.1 C | +2.30 C |
| 2007 | 23.9 C | +2.07 C |
| 2009 | 23.7 C | +1.89 C |
The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1950 to 2009. In Fahrenheit: 0.8 F (0.4 to 1.1) 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 | 0.4 C (0.2 to 0.6) per decade | 0.8 F (0.4 to 1.1) per decade | 1950 to 2009 | 46 | Rise |
| Mean daily maximum | 0.30 C (0.04 to 0.56) per decade | 0.5 F (0.1 to 1.0) per decade | 1950 to 2009 | 46 | Rise |
| Mean daily minimum | 0.6 C (0.4 to 0.7) per decade | 1.0 F (0.7 to 1.3) per decade | 1950 to 2009 | 46 | Rise |
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
1949 to 2010| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 56.1 C (133.0 F) | 1958 | 46.7 C (116.1 F) | 62 |
| Coldest night (TNn) | -6.7 C (19.9 F) | 1950 | -2.5 C (27.5 F) | 62 |
| Wettest day (Rx1day) | 79.8 mm (3.1 in) | 1967 | 14.1 mm (0.6 in) | 62 |
| Wettest five days (Rx5day) | 133.3 mm (5.2 in) | 1972 | 16.3 mm (0.6 in) | 62 |
| Longest dry spell (CDD) | 334 days | 2010 | 163 days | 62 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1949 | 46.7 C (116.1 F) |
| 1950 | 46.7 C (116.1 F) |
| 1951 | 46.7 C (116.1 F) |
| 1952 | 47.2 C (117.0 F) |
| 1953 | 47.2 C (117.0 F) |
| 1954 | 46.7 C (116.1 F) |
| 1955 | 47.2 C (117.0 F) |
| 1956 | 46.7 C (116.1 F) |
| 1957 | 48.3 C (118.9 F) |
| 1958 | 56.1 C (133.0 F) |
| 1959 | 46.7 C (116.1 F) |
| 1960 | 45.6 C (114.1 F) |
| 1961 | 47.8 C (118.0 F) |
| 1962 | 46.7 C (116.1 F) |
| 1963 | 45.0 C (113.0 F) |
| 1964 | 46.7 C (116.1 F) |
| 1965 | 48.9 C (120.0 F) |
| 1966 | 47.8 C (118.0 F) |
| 1967 | 45.0 C (113.0 F) |
| 1968 | 45.0 C (113.0 F) |
| 1969 | 46.7 C (116.1 F) |
| 1970 | 47.8 C (118.0 F) |
| 1971 | 46.7 C (116.1 F) |
| 1972 | 46.7 C (116.1 F) |
| 1973 | 47.8 C (118.0 F) |
| 1974 | 46.7 C (116.1 F) |
| 1975 | 45.6 C (114.1 F) |
| 1976 | 46.7 C (116.1 F) |
| 1977 | 46.7 C (116.1 F) |
| 1978 | 46.7 C (116.1 F) |
| 1979 | 46.7 C (116.1 F) |
| 1980 | 46.7 C (116.1 F) |
| 1981 | 29.4 C (84.9 F) |
| 1982 | 45.0 C (113.0 F) |
| 1983 | 41.7 C (107.1 F) |
| 1984 | 43.9 C (111.0 F) |
| 1985 | 48.9 C (120.0 F) |
| 1986 | 45.0 C (113.0 F) |
| 1987 | 47.8 C (118.0 F) |
| 1988 | 45.6 C (114.1 F) |
| 1989 | 45.6 C (114.1 F) |
| 1990 | 45.6 C (114.1 F) |
| 1991 | 45.0 C (113.0 F) |
| 1992 | 42.8 C (109.0 F) |
| 1993 | 48.9 C (120.0 F) |
| 1994 | 45.6 C (114.1 F) |
| 1995 | 50.0 C (122.0 F) |
| 1996 | 46.7 C (116.1 F) |
| 1997 | 47.8 C (118.0 F) |
| 1998 | 47.8 C (118.0 F) |
| 1999 | 42.8 C (109.0 F) |
| 2000 | 47.8 C (118.0 F) |
| 2001 | 46.7 C (116.1 F) |
| 2002 | 46.7 C (116.1 F) |
| 2003 | 50.0 C (122.0 F) |
| 2004 | 47.8 C (118.0 F) |
| 2005 | 48.9 C (120.0 F) |
| 2006 | 47.8 C (118.0 F) |
| 2007 | 48.9 C (120.0 F) |
| 2008 | 48.9 C (120.0 F) |
| 2009 | 48.9 C (120.0 F) |
| 2010 | 47.8 C (118.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1949 | -5.6 C (21.9 F) |
| 1950 | -6.7 C (19.9 F) |
| 1951 | -4.4 C (24.1 F) |
| 1952 | -5.0 C (23.0 F) |
| 1953 | -5.6 C (21.9 F) |
| 1954 | -5.0 C (23.0 F) |
| 1955 | -5.6 C (21.9 F) |
| 1956 | -3.9 C (25.0 F) |
| 1957 | -2.8 C (27.0 F) |
| 1958 | -1.7 C (28.9 F) |
| 1959 | -1.1 C (30.0 F) |
| 1960 | -4.4 C (24.1 F) |
| 1961 | -2.8 C (27.0 F) |
| 1962 | -5.0 C (23.0 F) |
| 1963 | -6.1 C (21.0 F) |
| 1964 | -5.6 C (21.9 F) |
| 1965 | -3.3 C (26.1 F) |
| 1966 | -5.0 C (23.0 F) |
| 1967 | -3.3 C (26.1 F) |
| 1968 | -5.0 C (23.0 F) |
| 1969 | -3.3 C (26.1 F) |
| 1970 | -3.3 C (26.1 F) |
| 1971 | -6.1 C (21.0 F) |
| 1972 | -5.0 C (23.0 F) |
| 1973 | -4.4 C (24.1 F) |
| 1974 | -3.3 C (26.1 F) |
| 1975 | -3.3 C (26.1 F) |
| 1976 | -6.1 C (21.0 F) |
| 1977 | -2.2 C (28.0 F) |
| 1978 | -5.0 C (23.0 F) |
| 1979 | -3.3 C (26.1 F) |
| 1980 | 0.0 C (32.0 F) |
| 1981 | 0.0 C (32.0 F) |
| 1982 | 0.0 C (32.0 F) |
| 1983 | 0.6 C (33.1 F) |
| 1984 | 0.6 C (33.1 F) |
| 1985 | 0.0 C (32.0 F) |
| 1986 | 0.0 C (32.0 F) |
| 1987 | -4.4 C (24.1 F) |
| 1988 | -6.1 C (21.0 F) |
| 1989 | 1.7 C (35.1 F) |
| 1990 | -3.3 C (26.1 F) |
| 1991 | 0.6 C (33.1 F) |
| 1992 | 0.6 C (33.1 F) |
| 1993 | 0.6 C (33.1 F) |
| 1994 | 1.7 C (35.1 F) |
| 1995 | 0.6 C (33.1 F) |
| 1996 | 1.7 C (35.1 F) |
| 1997 | 1.7 C (35.1 F) |
| 1998 | 0.6 C (33.1 F) |
| 1999 | 1.7 C (35.1 F) |
| 2000 | 1.7 C (35.1 F) |
| 2001 | 2.8 C (37.0 F) |
| 2002 | 1.7 C (35.1 F) |
| 2003 | 2.8 C (37.0 F) |
| 2004 | 1.7 C (35.1 F) |
| 2005 | 2.8 C (37.0 F) |
| 2006 | 1.7 C (35.1 F) |
| 2007 | 0.6 C (33.1 F) |
| 2008 | 1.7 C (35.1 F) |
| 2009 | 0.6 C (33.1 F) |
| 2010 | 1.7 C (35.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1949 | 6.9 mm (0.27 in) |
| 1950 | 11.4 mm (0.4 in) |
| 1951 | 18.3 mm (0.7 in) |
| 1952 | 10.7 mm (0.4 in) |
| 1953 | 8.9 mm (0.35 in) |
| 1954 | 2.5 mm (0.10 in) |
| 1955 | 48.8 mm (1.9 in) |
| 1956 | 0.5 mm (0.02 in) |
| 1957 | 29.0 mm (1.1 in) |
| 1958 | 10.9 mm (0.4 in) |
| 1959 | 25.9 mm (1.0 in) |
| 1960 | 14.2 mm (0.6 in) |
| 1961 | 10.2 mm (0.4 in) |
| 1962 | 14.0 mm (0.6 in) |
| 1963 | 14.0 mm (0.6 in) |
| 1964 | 9.9 mm (0.39 in) |
| 1965 | 10.2 mm (0.4 in) |
| 1966 | 5.8 mm (0.23 in) |
| 1967 | 79.8 mm (3.1 in) |
| 1968 | 19.8 mm (0.8 in) |
| 1969 | 45.0 mm (1.8 in) |
| 1970 | 11.7 mm (0.5 in) |
| 1971 | 28.7 mm (1.1 in) |
| 1972 | 68.3 mm (2.7 in) |
| 1973 | 7.9 mm (0.31 in) |
| 1974 | 57.7 mm (2.3 in) |
| 1975 | 14.0 mm (0.6 in) |
| 1976 | 35.3 mm (1.4 in) |
| 1977 | 17.0 mm (0.7 in) |
| 1978 | 16.8 mm (0.7 in) |
| 1979 | 28.2 mm (1.1 in) |
| 1980 | 20.8 mm (0.8 in) |
| 1981 | 15.0 mm (0.6 in) |
| 1982 | 23.4 mm (0.9 in) |
| 1983 | 30.0 mm (1.2 in) |
| 1984 | 20.8 mm (0.8 in) |
| 1985 | 8.9 mm (0.35 in) |
| 1986 | 16.8 mm (0.7 in) |
| 1987 | 11.9 mm (0.5 in) |
| 1988 | 3.8 mm (0.15 in) |
| 1989 | 1.3 mm (0.05 in) |
| 1990 | 1.3 mm (0.05 in) |
| 1991 | 17.8 mm (0.7 in) |
| 1992 | 4.8 mm (0.19 in) |
| 1993 | 2.8 mm (0.11 in) |
| 1994 | 18.8 mm (0.7 in) |
| 1995 | 16.8 mm (0.7 in) |
| 1996 | 0.0 mm (0.00 in) |
| 1997 | 8.9 mm (0.35 in) |
| 1998 | 15.0 mm (0.6 in) |
| 1999 | 9.9 mm (0.39 in) |
| 2000 | 49.8 mm (2.0 in) |
| 2001 | 46.0 mm (1.8 in) |
| 2002 | 1.8 mm (0.07 in) |
| 2003 | 17.8 mm (0.7 in) |
| 2004 | 22.9 mm (0.9 in) |
| 2005 | 10.9 mm (0.4 in) |
| 2006 | 7.9 mm (0.31 in) |
| 2007 | 34.8 mm (1.4 in) |
| 2008 | 30.0 mm (1.2 in) |
| 2009 | 5.8 mm (0.23 in) |
| 2010 | 0.0 mm (0.00 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1949 | 9.4 mm (0.37 in) |
| 1950 | 15.5 mm (0.6 in) |
| 1951 | 35.1 mm (1.4 in) |
| 1952 | 11.0 mm (0.4 in) |
| 1953 | 9.2 mm (0.36 in) |
| 1954 | 2.5 mm (0.10 in) |
| 1955 | 48.8 mm (1.9 in) |
| 1956 | 0.5 mm (0.02 in) |
| 1957 | 33.8 mm (1.3 in) |
| 1958 | 10.9 mm (0.4 in) |
| 1959 | 46.5 mm (1.8 in) |
| 1960 | 15.0 mm (0.6 in) |
| 1961 | 18.4 mm (0.7 in) |
| 1962 | 15.8 mm (0.6 in) |
| 1963 | 18.1 mm (0.7 in) |
| 1964 | 13.7 mm (0.5 in) |
| 1965 | 10.2 mm (0.4 in) |
| 1966 | 5.8 mm (0.23 in) |
| 1967 | 95.5 mm (3.8 in) |
| 1968 | 20.6 mm (0.8 in) |
| 1969 | 45.0 mm (1.8 in) |
| 1970 | 14.0 mm (0.6 in) |
| 1971 | 28.7 mm (1.1 in) |
| 1972 | 133.3 mm (5.2 in) |
| 1973 | 11.5 mm (0.5 in) |
| 1974 | 57.7 mm (2.3 in) |
| 1975 | 14.0 mm (0.6 in) |
| 1976 | 35.3 mm (1.4 in) |
| 1977 | 23.1 mm (0.9 in) |
| 1978 | 17.6 mm (0.7 in) |
| 1979 | 28.2 mm (1.1 in) |
| 1980 | 27.4 mm (1.1 in) |
| 1981 | 54.6 mm (2.1 in) |
| 1982 | 33.3 mm (1.3 in) |
| 1983 | 39.7 mm (1.6 in) |
| 1984 | 23.4 mm (0.9 in) |
| 1985 | 11.7 mm (0.5 in) |
| 1986 | 16.8 mm (0.7 in) |
| 1987 | 15.2 mm (0.6 in) |
| 1988 | 5.6 mm (0.22 in) |
| 1989 | 1.3 mm (0.05 in) |
| 1990 | 2.1 mm (0.08 in) |
| 1991 | 17.8 mm (0.7 in) |
| 1992 | 4.8 mm (0.19 in) |
| 1993 | 5.6 mm (0.22 in) |
| 1994 | 47.5 mm (1.9 in) |
| 1995 | 16.8 mm (0.7 in) |
| 1996 | 0.0 mm (0.00 in) |
| 1997 | 11.7 mm (0.5 in) |
| 1998 | 15.0 mm (0.6 in) |
| 1999 | 9.9 mm (0.39 in) |
| 2000 | 49.8 mm (2.0 in) |
| 2001 | 46.0 mm (1.8 in) |
| 2002 | 1.8 mm (0.07 in) |
| 2003 | 17.8 mm (0.7 in) |
| 2004 | 23.7 mm (0.9 in) |
| 2005 | 10.9 mm (0.4 in) |
| 2006 | 7.9 mm (0.31 in) |
| 2007 | 34.8 mm (1.4 in) |
| 2008 | 30.0 mm (1.2 in) |
| 2009 | 5.8 mm (0.23 in) |
| 2010 | 0.0 mm (0.00 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1949 | 160 days |
| 1950 | 129 days |
| 1951 | 129 days |
| 1952 | 106 days |
| 1953 | 305 days |
| 1954 | 115 days |
| 1955 | 188 days |
| 1956 | 245 days |
| 1957 | 98 days |
| 1958 | 154 days |
| 1959 | 93 days |
| 1960 | 229 days |
| 1961 | 321 days |
| 1962 | 241 days |
| 1963 | 216 days |
| 1964 | 158 days |
| 1965 | 121 days |
| 1966 | 215 days |
| 1967 | 156 days |
| 1968 | 179 days |
| 1969 | 105 days |
| 1970 | 208 days |
| 1971 | 92 days |
| 1972 | 157 days |
| 1973 | 145 days |
| 1974 | 201 days |
| 1975 | 173 days |
| 1976 | 100 days |
| 1977 | 153 days |
| 1978 | 114 days |
| 1979 | 97 days |
| 1980 | 81 days |
| 1981 | 92 days |
| 1982 | 178 days |
| 1983 | 166 days |
| 1984 | 194 days |
| 1985 | 224 days |
| 1986 | 156 days |
| 1987 | 175 days |
| 1988 | 131 days |
| 1989 | 214 days |
| 1990 | 249 days |
| 1991 | 217 days |
| 1992 | 143 days |
| 1993 | 74 days |
| 1994 | 213 days |
| 1995 | 153 days |
| 1996 | 154 days |
| 1997 | 169 days |
| 1998 | 30 days |
| 1999 | 92 days |
| 2000 | 231 days |
| 2001 | 156 days |
| 2002 | 241 days |
| 2003 | 168 days |
| 2004 | 201 days |
| 2005 | 142 days |
| 2006 | 168 days |
| 2007 | 239 days |
| 2008 | 240 days |
| 2009 | 330 days |
| 2010 | 334 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
28 years with a frostAcross 28 years with a frost, the median last spring frost at Riito falls on 24 February and the median first autumn frost on 29 November, which leaves a median of 287 days between them.
Fitted over all years, the growing season changes by +13.2 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1950 to 1987) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 24 February | n/a | 24 February | n/a | -9.0 days per decade |
| First autumn frost | 29 November | n/a | 29 November | n/a | +4.2 days per decade |
| Growing days | 287 days | n/a | 287 days | n/a | +13.2 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
54 years, 1950 to 2010A day with at least 15.6 mm (0.6 in) of rain is expected about once in 2 years. A day with at least 89.7 mm (3.5 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 15.6 mm (0.6 in) | |
| 5 years | 29.7 mm (1.2 in) | |
| 10 years | 41.0 mm (1.6 in) | |
| 25 years | 57.9 mm (2.3 in) | |
| 50 years | 72.8 mm (2.9 in) | |
| 100 years | 89.7 mm (3.5 in) | Longer than the 54 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, 54 years of values from 1950 to 2010.
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: 79.8 mm (3.1 in) in 1967; 68.3 mm (2.7 in) in 1972; 57.7 mm (2.3 in) in 1974.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Riito, at 1959 and 1995. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1959 ran 0.6 C (1.2 F) lower than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1995 ran 1.2 C (2.2 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1959 | -0.6 | -1.2 | possible | 5 |
| 1995 | +1.2 | +2.2 | 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.
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).