San Juan del Rio Weather Records (MXN00010068)
Record envelope, standing records and threshold days for San Juan del Rio (MXN00010068), Mexico, with 71 years of record.
Key Facts for San Juan del Rio
- San Juan del Rio (MXN00010068) is a weather station in Mexico at 24.78 latitude and -104.38 longitude, 1,700 m (5,577 ft) above sea level.
- The station reports from 1939 to 2009, 71 years of record.
- 1,464 records set at San Juan del Rio still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- San Juan del Rio tied a daily record low maximum temperature of 16.7 C (62.1 F) on 30 January 2009.
About the Station
- Location: Mexico, 24.78 latitude, -104.38 longitude.
- Elevation: 1,700 m (5,577 ft).
- Period of record: 1939 to 2009, 71 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 | 38.3 C (100.9 F) | -7.2 C (19.0 F) | n/a | n/a |
| Feb | 37.2 C (99.0 F) | -6.1 C (21.0 F) | n/a | n/a |
| Mar | 45.0 C (113.0 F) | -6.1 C (21.0 F) | n/a | n/a |
| Apr | 48.9 C (120.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| May | 47.8 C (118.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Jun | 46.1 C (115.0 F) | 7.8 C (46.0 F) | n/a | n/a |
| Jul | 45.0 C (113.0 F) | 8.3 C (46.9 F) | n/a | n/a |
| Aug | 45.0 C (113.0 F) | 6.7 C (44.1 F) | n/a | n/a |
| Sep | 45.0 C (113.0 F) | 2.8 C (37.0 F) | n/a | n/a |
| Oct | 43.3 C (109.9 F) | 0.0 C (32.0 F) | n/a | n/a |
| Nov | 40.6 C (105.1 F) | -6.1 C (21.0 F) | n/a | n/a |
| Dec | 37.8 C (100.0 F) | -8.3 C (17.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1939 | 3 |
| 1940 | 2 |
| 1942 | 2 |
| 1943 | 1 |
| 1944 | 34 |
| 1945 | 98 |
| 1946 | 144 |
| 1947 | 44 |
| 1948 | 57 |
| 1949 | 23 |
| 1950 | 8 |
| 1951 | 29 |
| 1952 | 18 |
| 1953 | 17 |
| 1954 | 20 |
| 1955 | 13 |
| 1956 | 14 |
| 1957 | 4 |
| 1958 | 9 |
| 1959 | 23 |
| 1960 | 6 |
| 1961 | 30 |
| 1962 | 5 |
| 1963 | 1 |
| 1964 | 14 |
| 1965 | 3 |
| 1967 | 2 |
| 1968 | 3 |
| 1969 | 3 |
| 1970 | 2 |
| 1971 | 3 |
| 1972 | 3 |
| 1973 | 26 |
| 1974 | 5 |
| 1975 | 5 |
| 1976 | 7 |
| 1977 | 5 |
| 1978 | 2 |
| 1979 | 12 |
| 1980 | 4 |
| 1981 | 1 |
| 1982 | 1 |
| 1983 | 8 |
| 1984 | 6 |
| 1985 | 14 |
| 1986 | 9 |
| 1987 | 15 |
| 1988 | 10 |
| 1989 | 13 |
| 1990 | 7 |
| 1991 | 11 |
| 1992 | 9 |
| 1993 | 2 |
| 1996 | 2 |
| 1997 | 100 |
| 1998 | 78 |
| 1999 | 19 |
| 2000 | 7 |
| 2001 | 9 |
| 2002 | 27 |
| 2003 | 64 |
| 2004 | 66 |
| 2005 | 62 |
| 2006 | 86 |
| 2007 | 81 |
| 2008 | 46 |
| 2009 | 7 |
All-Time Record Progression
7 new records| Date | Kind | Detail |
|---|---|---|
| 1997-12-09 | Record low maximum temperature | Record low maximum temperature 10.0 C (50.0 F) |
| 1997-12-13 | Record low minimum temperature | Record low minimum temperature -8.3 C (17.1 F) |
| 1997-12-14 | Record low maximum temperature | Record low maximum temperature 2.8 C (37.0 F) |
| 2002-04-18 | Record high minimum temperature | Record high minimum temperature 25.0 C (77.0 F) |
| 2002-05-06 | Record high minimum temperature | Record high minimum temperature 27.8 C (82.0 F) |
| 2003-05-07 | Record high maximum temperature | Record high maximum temperature 47.8 C (118.0 F) |
| 2006-04-17 | Record high maximum temperature | Record high maximum temperature 48.9 C (120.0 F) |
Wettest Day of Each Month
Oct: 92.5 mm (3.6 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 35.8 mm (1.4 in) | 30 January 1984 |
| Feb | 59.9 mm (2.4 in) | 15 February 1942 |
| Mar | 36.3 mm (1.4 in) | 3 March 1968 |
| Apr | 23.9 mm (0.9 in) | 10 April 1948 |
| May | 39.9 mm (1.6 in) | 27 May 1983 |
| Jun | 72.9 mm (2.9 in) | 25 June 1943 |
| Jul | 74.9 mm (2.9 in) | 14 July 1944 |
| Aug | 75.4 mm (3.0 in) | 3 August 2000 |
| Sep | 80.3 mm (3.2 in) | 26 September 1970 |
| Oct | 92.5 mm (3.6 in) | 15 October 1958 |
| Nov | 46.0 mm (1.8 in) | 19 November 1989 |
| Dec | 49.8 mm (2.0 in) | 4 December 1943 |
Period of Record Coverage
1939 to 2009| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1939 | 365 | 100% | Yes |
| 1940 | 366 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 364 | 100% | Yes |
| 1944 | 330 | 90% | Yes |
| 1945 | 326 | 89% | No |
| 1946 | 336 | 92% | Yes |
| 1947 | 324 | 89% | No |
| 1948 | 363 | 99% | Yes |
| 1949 | 359 | 98% | Yes |
| 1950 | 364 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 353 | 96% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 363 | 99% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 261 | 72% | No |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 351 | 96% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 364 | 100% | Yes |
| 1984 | 357 | 98% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 364 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 353 | 96% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 181 | 50% | No |
| 1996 | 61 | 17% | No |
| 1997 | 358 | 98% | Yes |
| 1998 | 269 | 74% | No |
| 1999 | 57 | 16% | No |
| 2000 | 46 | 13% | No |
| 2001 | 248 | 68% | No |
| 2002 | 181 | 50% | No |
| 2003 | 351 | 96% | Yes |
| 2004 | 356 | 97% | Yes |
| 2005 | 326 | 89% | No |
| 2006 | 352 | 96% | Yes |
| 2007 | 302 | 83% | No |
| 2008 | 288 | 79% | No |
| 2009 | 30 | 8% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 30 January 2009 | San Juan del Rio, MX | daily low max (Tie) | 16.7 C (62.1 F) | tie | 60 years | 6 of 100 (Routine) |
| 25 January 2009 | San Juan del Rio, MX | daily high min | 16.7 C (62.1 F) | 2.8 C (5.0 F) | 3 years | 14 of 100 (Routine) |
| 24 January 2009 | San Juan del Rio, MX | daily high min | 15.6 C (60.1 F) | 2.8 C (5.0 F) | 7 years | 16 of 100 (Routine) |
| 23 January 2009 | San Juan del Rio, MX | daily high min | 13.9 C (57.0 F) | 1.1 C (2.0 F) | 3 years | 10 of 100 (Routine) |
| 21 January 2009 | San Juan del Rio, MX | daily high min | 15.0 C (59.0 F) | 3.3 C (5.9 F) | 11 years | 19 of 100 (Routine) |
| 18 January 2009 | San Juan del Rio, MX | daily high min | 15.6 C (60.1 F) | 0.6 C (1.1 F) | 3 years | 8 of 100 (Routine) |
| 14 January 2009 | San Juan del Rio, MX | daily high min | 15.0 C (59.0 F) | 3.3 C (5.9 F) | 62 years | 34 of 100 (Routine) |
| 7 January 2009 | San Juan del Rio, MX | daily high min | 15.6 C (60.1 F) | 1.7 C (3.1 F) | 2 years | 11 of 100 (Routine) |
| 1 January 2009 | San Juan del Rio, MX | daily high min (Tie) | 15.0 C (59.0 F) | tie | 2 years | 1 of 100 (Routine) |
| 28 December 2008 | San Juan del Rio, MX | daily high min | 15.0 C (59.0 F) | 1.7 C (3.1 F) | 64 years | 31 of 100 (Routine) |
| 27 December 2008 | San Juan del Rio, MX | daily high min | 12.8 C (55.0 F) | 1.1 C (2.0 F) | 64 years | 29 of 100 (Routine) |
| 26 December 2008 | San Juan del Rio, MX | daily high min | 15.0 C (59.0 F) | 3.3 C (5.9 F) | 64 years | 35 of 100 (Notable) |
| 25 December 2008 | San Juan del Rio, MX | daily high min | 15.6 C (60.1 F) | 2.8 C (5.0 F) | 64 years | 34 of 100 (Routine) |
| 24 December 2008 | San Juan del Rio, MX | daily high min | 13.9 C (57.0 F) | 3.3 C (5.9 F) | 64 years | 35 of 100 (Notable) |
| 23 December 2008 | San Juan del Rio, MX | daily high min | 15.0 C (59.0 F) | 2.8 C (5.0 F) | 65 years | 34 of 100 (Routine) |
| 22 December 2008 | San Juan del Rio, MX | daily high min | 12.8 C (55.0 F) | 1.1 C (2.0 F) | 63 years | 28 of 100 (Routine) |
| 21 December 2008 | San Juan del Rio, MX | daily high min | 12.8 C (55.0 F) | 1.1 C (2.0 F) | 59 years | 27 of 100 (Routine) |
| 20 December 2008 | San Juan del Rio, MX | daily high min | 13.9 C (57.0 F) | 2.2 C (4.0 F) | 2 years | 13 of 100 (Routine) |
| 13 December 2008 | San Juan del Rio, MX | daily high min | 15.6 C (60.1 F) | 3.9 C (7.0 F) | 65 years | 37 of 100 (Notable) |
| 12 December 2008 | San Juan del Rio, MX | daily high min | 15.0 C (59.0 F) | 2.2 C (4.0 F) | 65 years | 32 of 100 (Routine) |
Climate Trend
41 complete years, 1941 to 2004| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1941 | 20.7 C | +1.48 C |
| 1943 | 20.4 C | +1.17 C |
| 1950 | 18.6 C | -0.63 C |
| 1951 | 18.4 C | -0.87 C |
| 1953 | 20.4 C | +1.18 C |
| 1954 | 21.8 C | +2.62 C |
| 1955 | 18.4 C | -0.83 C |
| 1956 | 18.7 C | -0.57 C |
| 1957 | 19.1 C | -0.11 C |
| 1958 | 17.9 C | -1.31 C |
| 1959 | 18.3 C | -0.93 C |
| 1960 | 19.7 C | +0.43 C |
| 1961 | 20.2 C | +0.99 C |
| 1962 | 20.8 C | +1.61 C |
| 1963 | 20.8 C | +1.59 C |
| 1964 | 19.8 C | +0.58 C |
| 1965 | 19.5 C | +0.24 C |
| 1966 | 20.4 C | +1.22 C |
| 1967 | 21.0 C | +1.78 C |
| 1968 | 19.6 C | +0.39 C |
| 1969 | 19.5 C | +0.26 C |
| 1970 | 20.2 C | +1.00 C |
| 1972 | 19.5 C | +0.32 C |
| 1974 | 19.5 C | +0.32 C |
| 1975 | 19.3 C | +0.07 C |
| 1976 | 19.0 C | -0.21 C |
| 1978 | 19.0 C | -0.19 C |
| 1979 | 18.5 C | -0.68 C |
| 1980 | 19.1 C | -0.10 C |
| 1981 | 18.7 C | -0.51 C |
| 1982 | 19.6 C | +0.41 C |
| 1983 | 18.5 C | -0.73 C |
| 1984 | 17.9 C | -1.35 C |
| 1985 | 18.3 C | -0.91 C |
| 1986 | 18.0 C | -1.21 C |
| 1987 | 17.6 C | -1.60 C |
| 1989 | 18.0 C | -1.27 C |
| 1990 | 17.7 C | -1.55 C |
| 1991 | 17.8 C | -1.43 C |
| 1992 | 17.7 C | -1.53 C |
| 2004 | 20.1 C | +0.85 C |
The annual mean temperature here has fallen by 0.3 C (0.1 to 0.6) per decade over 1941 to 2004. In Fahrenheit: 0.6 F (0.2 to 1.0) per decade. The slope is a straight line fitted to 41 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.3 C (-0.6 to -0.1) per decade | -0.6 F (-1.0 to -0.2) per decade | 1941 to 2004 | 41 | Fall |
| Mean daily maximum | -0.7 C (-1.0 to -0.4) per decade | -1.2 F (-1.8 to -0.7) per decade | 1941 to 2004 | 41 | Fall |
| Mean daily minimum | 0.00 C (-0.25 to 0.24) per decade | -0.01 F (-0.45 to 0.44) per decade | 1941 to 2004 | 41 | 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
1939 to 2009| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 48.9 C (120.0 F) | 2006 | 38.9 C (102.0 F) | 69 |
| Coldest night (TNn) | -8.3 C (17.1 F) | 1997 | -2.8 C (27.0 F) | 69 |
| Wettest day (Rx1day) | 92.5 mm (3.6 in) | 1958 | 40.4 mm (1.6 in) | 69 |
| Wettest five days (Rx5day) | 202.7 mm (8.0 in) | 1944 | 73.2 mm (2.9 in) | 69 |
| Longest dry spell (CDD) | 156 days | 1978 | 87 days | 69 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1939 | 39.4 C (102.9 F) |
| 1940 | 37.2 C (99.0 F) |
| 1941 | 38.9 C (102.0 F) |
| 1942 | 39.4 C (102.9 F) |
| 1943 | 38.9 C (102.0 F) |
| 1944 | 43.3 C (109.9 F) |
| 1945 | 47.2 C (117.0 F) |
| 1946 | 46.7 C (116.1 F) |
| 1947 | 43.9 C (111.0 F) |
| 1948 | 43.3 C (109.9 F) |
| 1949 | 36.7 C (98.1 F) |
| 1950 | 38.9 C (102.0 F) |
| 1951 | 35.0 C (95.0 F) |
| 1952 | 41.7 C (107.1 F) |
| 1953 | 45.0 C (113.0 F) |
| 1954 | 43.3 C (109.9 F) |
| 1955 | 35.6 C (96.1 F) |
| 1956 | 35.6 C (96.1 F) |
| 1957 | 37.8 C (100.0 F) |
| 1958 | 35.6 C (96.1 F) |
| 1959 | 37.8 C (100.0 F) |
| 1960 | 41.7 C (107.1 F) |
| 1961 | 42.8 C (109.0 F) |
| 1962 | 43.3 C (109.9 F) |
| 1963 | 37.8 C (100.0 F) |
| 1964 | 40.0 C (104.0 F) |
| 1965 | 40.0 C (104.0 F) |
| 1966 | 40.0 C (104.0 F) |
| 1967 | 41.1 C (106.0 F) |
| 1968 | 41.1 C (106.0 F) |
| 1969 | 40.0 C (104.0 F) |
| 1970 | 41.1 C (106.0 F) |
| 1971 | 38.3 C (100.9 F) |
| 1972 | 38.3 C (100.9 F) |
| 1973 | 36.7 C (98.1 F) |
| 1974 | 40.0 C (104.0 F) |
| 1975 | 39.4 C (102.9 F) |
| 1976 | 39.4 C (102.9 F) |
| 1977 | 37.8 C (100.0 F) |
| 1978 | 38.9 C (102.0 F) |
| 1979 | 37.2 C (99.0 F) |
| 1980 | 38.3 C (100.9 F) |
| 1981 | 39.4 C (102.9 F) |
| 1982 | 38.3 C (100.9 F) |
| 1983 | 36.1 C (97.0 F) |
| 1984 | 37.8 C (100.0 F) |
| 1985 | 38.3 C (100.9 F) |
| 1986 | 35.6 C (96.1 F) |
| 1987 | 36.7 C (98.1 F) |
| 1988 | 36.1 C (97.0 F) |
| 1989 | 37.8 C (100.0 F) |
| 1990 | 37.8 C (100.0 F) |
| 1991 | 37.8 C (100.0 F) |
| 1992 | 37.8 C (100.0 F) |
| 1993 | 38.9 C (102.0 F) |
| 1996 | 30.6 C (87.1 F) |
| 1997 | 45.0 C (113.0 F) |
| 1998 | 30.6 C (87.1 F) |
| 1999 | 20.6 C (69.1 F) |
| 2000 | 33.9 C (93.0 F) |
| 2001 | 38.9 C (102.0 F) |
| 2002 | 40.0 C (104.0 F) |
| 2003 | 47.8 C (118.0 F) |
| 2004 | 38.9 C (102.0 F) |
| 2005 | 41.7 C (107.1 F) |
| 2006 | 48.9 C (120.0 F) |
| 2007 | 36.7 C (98.1 F) |
| 2008 | 36.7 C (98.1 F) |
| 2009 | 22.8 C (73.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1939 | 0.6 C (33.1 F) |
| 1940 | 1.7 C (35.1 F) |
| 1941 | 1.1 C (34.0 F) |
| 1942 | 0.6 C (33.1 F) |
| 1943 | 0.6 C (33.1 F) |
| 1944 | -5.0 C (23.0 F) |
| 1945 | -1.7 C (28.9 F) |
| 1946 | -2.2 C (28.0 F) |
| 1947 | -2.2 C (28.0 F) |
| 1948 | 0.0 C (32.0 F) |
| 1949 | -5.0 C (23.0 F) |
| 1950 | -4.4 C (24.1 F) |
| 1951 | -6.1 C (21.0 F) |
| 1952 | -3.3 C (26.1 F) |
| 1953 | -5.0 C (23.0 F) |
| 1954 | -3.9 C (25.0 F) |
| 1955 | -7.2 C (19.0 F) |
| 1956 | -6.1 C (21.0 F) |
| 1957 | -6.1 C (21.0 F) |
| 1958 | -4.4 C (24.1 F) |
| 1959 | -2.2 C (28.0 F) |
| 1960 | -3.3 C (26.1 F) |
| 1961 | -4.4 C (24.1 F) |
| 1962 | -6.7 C (19.9 F) |
| 1963 | 0.0 C (32.0 F) |
| 1964 | -4.4 C (24.1 F) |
| 1965 | -3.3 C (26.1 F) |
| 1966 | -2.2 C (28.0 F) |
| 1967 | -4.4 C (24.1 F) |
| 1968 | -1.1 C (30.0 F) |
| 1969 | -1.7 C (28.9 F) |
| 1970 | -1.7 C (28.9 F) |
| 1971 | -2.8 C (27.0 F) |
| 1972 | -0.6 C (30.9 F) |
| 1973 | -5.0 C (23.0 F) |
| 1974 | -2.2 C (28.0 F) |
| 1975 | -3.9 C (25.0 F) |
| 1976 | -3.3 C (26.1 F) |
| 1977 | 0.0 C (32.0 F) |
| 1978 | -2.2 C (28.0 F) |
| 1979 | -5.0 C (23.0 F) |
| 1980 | -2.2 C (28.0 F) |
| 1981 | 0.0 C (32.0 F) |
| 1982 | -2.2 C (28.0 F) |
| 1983 | -3.3 C (26.1 F) |
| 1984 | -3.3 C (26.1 F) |
| 1985 | -7.2 C (19.0 F) |
| 1986 | -4.4 C (24.1 F) |
| 1987 | -5.0 C (23.0 F) |
| 1988 | -5.0 C (23.0 F) |
| 1989 | -4.4 C (24.1 F) |
| 1990 | -5.6 C (21.9 F) |
| 1991 | -6.1 C (21.0 F) |
| 1992 | -5.0 C (23.0 F) |
| 1993 | -1.1 C (30.0 F) |
| 1996 | 5.6 C (42.1 F) |
| 1997 | -8.3 C (17.1 F) |
| 1998 | -1.1 C (30.0 F) |
| 1999 | -1.1 C (30.0 F) |
| 2000 | 8.9 C (48.0 F) |
| 2001 | 3.9 C (39.0 F) |
| 2002 | 0.0 C (32.0 F) |
| 2003 | 0.6 C (33.1 F) |
| 2004 | 0.6 C (33.1 F) |
| 2005 | -4.4 C (24.1 F) |
| 2006 | -2.2 C (28.0 F) |
| 2007 | -7.2 C (19.0 F) |
| 2008 | 5.6 C (42.1 F) |
| 2009 | 10.0 C (50.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1939 | 37.8 mm (1.5 in) |
| 1940 | 29.0 mm (1.1 in) |
| 1941 | 46.7 mm (1.8 in) |
| 1942 | 59.9 mm (2.4 in) |
| 1943 | 72.9 mm (2.9 in) |
| 1944 | 74.9 mm (2.9 in) |
| 1945 | 31.5 mm (1.2 in) |
| 1946 | 44.5 mm (1.8 in) |
| 1947 | 51.8 mm (2.0 in) |
| 1948 | 47.8 mm (1.9 in) |
| 1949 | 26.9 mm (1.1 in) |
| 1950 | 54.9 mm (2.2 in) |
| 1951 | 59.9 mm (2.4 in) |
| 1952 | 39.9 mm (1.6 in) |
| 1953 | 34.5 mm (1.4 in) |
| 1954 | 42.4 mm (1.7 in) |
| 1955 | 35.8 mm (1.4 in) |
| 1956 | 31.8 mm (1.3 in) |
| 1957 | 21.8 mm (0.9 in) |
| 1958 | 92.5 mm (3.6 in) |
| 1959 | 19.8 mm (0.8 in) |
| 1960 | 31.2 mm (1.2 in) |
| 1961 | 32.3 mm (1.3 in) |
| 1962 | 34.8 mm (1.4 in) |
| 1963 | 45.0 mm (1.8 in) |
| 1964 | 32.3 mm (1.3 in) |
| 1965 | 69.3 mm (2.7 in) |
| 1966 | 29.0 mm (1.1 in) |
| 1967 | 64.3 mm (2.5 in) |
| 1968 | 36.3 mm (1.4 in) |
| 1969 | 50.0 mm (2.0 in) |
| 1970 | 80.3 mm (3.2 in) |
| 1971 | 50.8 mm (2.0 in) |
| 1972 | 53.3 mm (2.1 in) |
| 1973 | 69.1 mm (2.7 in) |
| 1974 | 42.9 mm (1.7 in) |
| 1975 | 31.8 mm (1.3 in) |
| 1976 | 33.8 mm (1.3 in) |
| 1977 | 58.9 mm (2.3 in) |
| 1978 | 39.9 mm (1.6 in) |
| 1979 | 46.0 mm (1.8 in) |
| 1980 | 37.6 mm (1.5 in) |
| 1981 | 51.8 mm (2.0 in) |
| 1982 | 43.7 mm (1.7 in) |
| 1983 | 39.9 mm (1.6 in) |
| 1984 | 40.4 mm (1.6 in) |
| 1985 | 40.6 mm (1.6 in) |
| 1986 | 40.4 mm (1.6 in) |
| 1987 | 55.1 mm (2.2 in) |
| 1988 | 41.7 mm (1.6 in) |
| 1989 | 46.0 mm (1.8 in) |
| 1990 | 39.9 mm (1.6 in) |
| 1991 | 56.1 mm (2.2 in) |
| 1992 | 37.1 mm (1.5 in) |
| 1993 | 45.0 mm (1.8 in) |
| 1996 | 23.9 mm (0.9 in) |
| 1997 | 27.7 mm (1.1 in) |
| 1998 | 29.0 mm (1.1 in) |
| 1999 | 0.0 mm (0.00 in) |
| 2000 | 75.4 mm (3.0 in) |
| 2001 | 25.9 mm (1.0 in) |
| 2002 | 34.8 mm (1.4 in) |
| 2003 | 30.0 mm (1.2 in) |
| 2004 | 59.9 mm (2.4 in) |
| 2005 | 20.8 mm (0.8 in) |
| 2006 | 51.8 mm (2.0 in) |
| 2007 | 59.9 mm (2.4 in) |
| 2008 | 30.0 mm (1.2 in) |
| 2009 | 0.0 mm (0.00 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1939 | 55.2 mm (2.2 in) |
| 1940 | 69.4 mm (2.7 in) |
| 1941 | 133.6 mm (5.3 in) |
| 1942 | 94.0 mm (3.7 in) |
| 1943 | 148.9 mm (5.9 in) |
| 1944 | 202.7 mm (8.0 in) |
| 1945 | 66.7 mm (2.6 in) |
| 1946 | 74.3 mm (2.9 in) |
| 1947 | 86.3 mm (3.4 in) |
| 1948 | 95.6 mm (3.8 in) |
| 1949 | 47.5 mm (1.9 in) |
| 1950 | 66.3 mm (2.6 in) |
| 1951 | 145.2 mm (5.7 in) |
| 1952 | 69.3 mm (2.7 in) |
| 1953 | 70.0 mm (2.8 in) |
| 1954 | 63.2 mm (2.5 in) |
| 1955 | 53.3 mm (2.1 in) |
| 1956 | 50.6 mm (2.0 in) |
| 1957 | 37.9 mm (1.5 in) |
| 1958 | 108.3 mm (4.3 in) |
| 1959 | 56.4 mm (2.2 in) |
| 1960 | 109.9 mm (4.3 in) |
| 1961 | 48.3 mm (1.9 in) |
| 1962 | 66.1 mm (2.6 in) |
| 1963 | 90.0 mm (3.5 in) |
| 1964 | 54.2 mm (2.1 in) |
| 1965 | 99.1 mm (3.9 in) |
| 1966 | 71.4 mm (2.8 in) |
| 1967 | 115.6 mm (4.6 in) |
| 1968 | 60.2 mm (2.4 in) |
| 1969 | 66.2 mm (2.6 in) |
| 1970 | 142.8 mm (5.6 in) |
| 1971 | 110.9 mm (4.4 in) |
| 1972 | 86.3 mm (3.4 in) |
| 1973 | 112.9 mm (4.4 in) |
| 1974 | 98.3 mm (3.9 in) |
| 1975 | 54.4 mm (2.1 in) |
| 1976 | 60.8 mm (2.4 in) |
| 1977 | 116.9 mm (4.6 in) |
| 1978 | 87.1 mm (3.4 in) |
| 1979 | 85.4 mm (3.4 in) |
| 1980 | 96.1 mm (3.8 in) |
| 1981 | 80.7 mm (3.2 in) |
| 1982 | 45.0 mm (1.8 in) |
| 1983 | 72.0 mm (2.8 in) |
| 1984 | 125.5 mm (4.9 in) |
| 1985 | 83.0 mm (3.3 in) |
| 1986 | 99.9 mm (3.9 in) |
| 1987 | 91.5 mm (3.6 in) |
| 1988 | 70.1 mm (2.8 in) |
| 1989 | 72.4 mm (2.9 in) |
| 1990 | 73.2 mm (2.9 in) |
| 1991 | 121.6 mm (4.8 in) |
| 1992 | 55.2 mm (2.2 in) |
| 1993 | 118.2 mm (4.7 in) |
| 1996 | 56.4 mm (2.2 in) |
| 1997 | 55.6 mm (2.2 in) |
| 1998 | 53.9 mm (2.1 in) |
| 1999 | 0.0 mm (0.00 in) |
| 2000 | 104.6 mm (4.1 in) |
| 2001 | 57.5 mm (2.3 in) |
| 2002 | 51.6 mm (2.0 in) |
| 2003 | 49.8 mm (2.0 in) |
| 2004 | 107.7 mm (4.2 in) |
| 2005 | 68.6 mm (2.7 in) |
| 2006 | 116.6 mm (4.6 in) |
| 2007 | 157.6 mm (6.2 in) |
| 2008 | 94.7 mm (3.7 in) |
| 2009 | 0.0 mm (0.00 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1939 | 114 days |
| 1940 | 110 days |
| 1941 | 48 days |
| 1942 | 109 days |
| 1943 | 90 days |
| 1944 | 93 days |
| 1945 | 108 days |
| 1946 | 87 days |
| 1947 | 124 days |
| 1948 | 59 days |
| 1949 | 143 days |
| 1950 | 88 days |
| 1951 | 76 days |
| 1952 | 91 days |
| 1953 | 65 days |
| 1954 | 100 days |
| 1955 | 154 days |
| 1956 | 112 days |
| 1957 | 77 days |
| 1958 | 41 days |
| 1959 | 98 days |
| 1960 | 76 days |
| 1961 | 69 days |
| 1962 | 146 days |
| 1963 | 89 days |
| 1964 | 61 days |
| 1965 | 83 days |
| 1966 | 64 days |
| 1967 | 67 days |
| 1968 | 39 days |
| 1969 | 132 days |
| 1970 | 90 days |
| 1971 | 61 days |
| 1972 | 77 days |
| 1973 | 70 days |
| 1974 | 74 days |
| 1975 | 132 days |
| 1976 | 79 days |
| 1977 | 93 days |
| 1978 | 156 days |
| 1979 | 116 days |
| 1980 | 99 days |
| 1981 | 48 days |
| 1982 | 50 days |
| 1983 | 81 days |
| 1984 | 98 days |
| 1985 | 82 days |
| 1986 | 82 days |
| 1987 | 53 days |
| 1988 | 80 days |
| 1989 | 147 days |
| 1990 | 80 days |
| 1991 | 116 days |
| 1992 | 45 days |
| 1993 | 132 days |
| 1996 | 27 days |
| 1997 | 128 days |
| 1998 | 39 days |
| 1999 | 59 days |
| 2000 | 22 days |
| 2001 | 42 days |
| 2002 | 61 days |
| 2003 | 110 days |
| 2004 | 112 days |
| 2005 | 142 days |
| 2006 | 101 days |
| 2007 | 140 days |
| 2008 | 99 days |
| 2009 | 31 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
33 years with a frostAcross 33 years with a frost, the median last spring frost at San Juan del Rio falls on 25 February and the median first autumn frost on 1 December, which leaves a median of 285 days between them.
Fitted over all years, the growing season changes by -5.0 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1954 to 1992) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 25 February | n/a | 26 February | n/a | +0.9 days per decade |
| First autumn frost | 1 December | n/a | 3 December | n/a | -4.1 days per decade |
| Growing days | 285 days | n/a | 289 days | n/a | -5.0 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
58 years, 1939 to 2006A day with at least 42.3 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 94.0 mm (3.7 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 42.3 mm (1.7 in) | |
| 5 years | 56.1 mm (2.2 in) | |
| 10 years | 65.3 mm (2.6 in) | |
| 25 years | 76.9 mm (3.0 in) | |
| 50 years | 85.5 mm (3.4 in) | |
| 100 years | 94.0 mm (3.7 in) | Longer than the 58 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, 58 years of values from 1939 to 2006.
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: 92.5 mm (3.6 in) in 1958; 80.3 mm (3.2 in) in 1970; 74.9 mm (2.9 in) in 1944.
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).