San Francisco Tlalcilalcalpan Weather Records (MXN00015089)
Record envelope, standing records and threshold days for San Francisco Tlalcilalcalpan (MXN00015089), Mexico, with 72 years of record.
Key Facts for San Francisco Tlalcilalcalpan
- San Francisco Tlalcilalcalpan (MXN00015089) is a weather station in Mexico at 19.28 latitude and -99.77 longitude, 2,773 m (9,097 ft) above sea level.
- The station reports from 1939 to 2010, 72 years of record.
- 1,464 records set at San Francisco Tlalcilalcalpan still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- San Francisco Tlalcilalcalpan tied a daily record precipitation of 2.3 mm (0.09 in) on 22 November 2010.
About the Station
- Location: Mexico, 19.28 latitude, -99.77 longitude.
- Elevation: 2,773 m (9,097 ft).
- Period of record: 1939 to 2010, 72 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 | 28.9 C (84.0 F) | -5.0 C (23.0 F) | n/a | n/a |
| Feb | 31.7 C (89.1 F) | -5.0 C (23.0 F) | n/a | n/a |
| Mar | 35.0 C (95.0 F) | -5.0 C (23.0 F) | n/a | n/a |
| Apr | 38.9 C (102.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| May | 35.6 C (96.1 F) | 0.6 C (33.1 F) | n/a | n/a |
| Jun | 31.7 C (89.1 F) | 0.6 C (33.1 F) | n/a | n/a |
| Jul | 30.0 C (86.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Aug | 31.7 C (89.1 F) | 0.0 C (32.0 F) | n/a | n/a |
| Sep | 31.7 C (89.1 F) | 0.0 C (32.0 F) | n/a | n/a |
| Oct | 31.7 C (89.1 F) | -4.4 C (24.1 F) | n/a | n/a |
| Nov | 33.9 C (93.0 F) | -10.0 C (14.0 F) | n/a | n/a |
| Dec | 29.4 C (84.9 F) | -9.4 C (15.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1939 | 48 |
| 1940 | 59 |
| 1941 | 24 |
| 1944 | 25 |
| 1945 | 44 |
| 1946 | 20 |
| 1947 | 17 |
| 1948 | 9 |
| 1949 | 22 |
| 1950 | 32 |
| 1951 | 85 |
| 1952 | 78 |
| 1953 | 17 |
| 1954 | 11 |
| 1955 | 11 |
| 1956 | 19 |
| 1957 | 11 |
| 1958 | 29 |
| 1959 | 20 |
| 1960 | 13 |
| 1961 | 14 |
| 1962 | 21 |
| 1963 | 7 |
| 1964 | 6 |
| 1965 | 13 |
| 1966 | 11 |
| 1967 | 14 |
| 1968 | 20 |
| 1969 | 19 |
| 1970 | 12 |
| 1971 | 148 |
| 1972 | 138 |
| 1973 | 21 |
| 1974 | 53 |
| 1975 | 44 |
| 1976 | 45 |
| 1977 | 3 |
| 1978 | 5 |
| 1979 | 10 |
| 1980 | 11 |
| 1981 | 11 |
| 1982 | 6 |
| 1983 | 23 |
| 1984 | 4 |
| 1985 | 7 |
| 1986 | 14 |
| 1987 | 12 |
| 1988 | 10 |
| 1989 | 6 |
| 1990 | 8 |
| 1991 | 5 |
| 1992 | 9 |
| 1993 | 7 |
| 1994 | 2 |
| 1995 | 8 |
| 1996 | 4 |
| 1997 | 8 |
| 1998 | 14 |
| 1999 | 9 |
| 2000 | 2 |
| 2001 | 5 |
| 2002 | 4 |
| 2003 | 7 |
| 2004 | 10 |
| 2005 | 12 |
| 2006 | 9 |
| 2007 | 7 |
| 2008 | 7 |
| 2009 | 8 |
| 2010 | 17 |
Wettest Day of Each Month
Jul: 199.9 mm (7.9 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 75.7 mm (3.0 in) | 23 January 2006 |
| Feb | 45.5 mm (1.8 in) | 4 February 2010 |
| Mar | 37.8 mm (1.5 in) | 14 March 1940 |
| Apr | 70.1 mm (2.8 in) | 20 April 1977 |
| May | 42.4 mm (1.7 in) | 9 May 1968 |
| Jun | 48.8 mm (1.9 in) | 21 June 1995 |
| Jul | 199.9 mm (7.9 in) | 13 July 1951 |
| Aug | 49.3 mm (1.9 in) | 9 August 1939 |
| Sep | 89.9 mm (3.5 in) | 13 September 1976 |
| Oct | 64.8 mm (2.6 in) | 1 October 1971 |
| Nov | 45.0 mm (1.8 in) | 7 November 1951 |
| Dec | 27.9 mm (1.1 in) | 30 December 1995 |
Period of Record Coverage
1939 to 2010| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1939 | 214 | 59% | No |
| 1940 | 351 | 96% | Yes |
| 1941 | 243 | 67% | No |
| 1944 | 299 | 82% | No |
| 1945 | 168 | 46% | No |
| 1946 | 205 | 56% | No |
| 1947 | 209 | 57% | No |
| 1948 | 215 | 59% | No |
| 1949 | 213 | 58% | No |
| 1950 | 212 | 58% | No |
| 1951 | 250 | 68% | No |
| 1952 | 281 | 77% | No |
| 1953 | 293 | 80% | No |
| 1954 | 329 | 90% | Yes |
| 1955 | 329 | 90% | Yes |
| 1956 | 361 | 99% | Yes |
| 1957 | 360 | 99% | Yes |
| 1958 | 358 | 98% | Yes |
| 1959 | 362 | 99% | Yes |
| 1960 | 365 | 100% | Yes |
| 1961 | 363 | 99% | Yes |
| 1962 | 351 | 96% | Yes |
| 1963 | 350 | 96% | Yes |
| 1964 | 324 | 89% | No |
| 1965 | 353 | 97% | Yes |
| 1966 | 351 | 96% | Yes |
| 1967 | 347 | 95% | Yes |
| 1968 | 353 | 96% | Yes |
| 1969 | 343 | 94% | Yes |
| 1970 | 351 | 96% | Yes |
| 1971 | 351 | 96% | Yes |
| 1972 | 345 | 94% | Yes |
| 1973 | 356 | 98% | Yes |
| 1974 | 343 | 94% | Yes |
| 1975 | 352 | 96% | Yes |
| 1976 | 354 | 97% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 363 | 99% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 335 | 92% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 364 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 364 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 301 | 82% | No |
| 2002 | 364 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 364 | 100% | Yes |
| 2006 | 334 | 92% | Yes |
| 2007 | 361 | 99% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 364 | 100% | Yes |
| 2010 | 333 | 91% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 22 November 2010 | San Francisco Tlalcilalcalpan, MX | daily rain (Tie) | 2.3 mm (0.09 in) | tie | 15 years | 2 of 100 (Routine) |
| 10 November 2010 | San Francisco Tlalcilalcalpan, MX | daily low min | 0.0 C (32.0 F) | 0.6 C (1.1 F) | 60 years | 27 of 100 (Routine) |
| 9 November 2010 | San Francisco Tlalcilalcalpan, MX | daily low min (Tie) | -1.1 C (30.0 F) | tie | 13 years | 2 of 100 (Routine) |
| 8 November 2010 | San Francisco Tlalcilalcalpan, MX | daily low min | -1.1 C (30.0 F) | 1.1 C (2.0 F) | 60 years | 29 of 100 (Routine) |
| 7 November 2010 | San Francisco Tlalcilalcalpan, MX | daily low min | -2.2 C (28.0 F) | 1.1 C (2.0 F) | 28 years | 19 of 100 (Routine) |
| 5 November 2010 | San Francisco Tlalcilalcalpan, MX | daily low min | -3.3 C (26.1 F) | 2.7 C (4.9 F) | 23 years | 23 of 100 (Routine) |
| 2 November 2010 | San Francisco Tlalcilalcalpan, MX | daily rain | 11.9 mm (0.5 in) | 1.7 mm (0.07 in) | 17 years | 14 of 100 (Routine) |
| 25 September 2010 | San Francisco Tlalcilalcalpan, MX | daily high min (Tie) | 10.6 C (51.1 F) | tie | 53 years | 5 of 100 (Routine) |
| 6 September 2010 | San Francisco Tlalcilalcalpan, MX | daily high min (Tie) | 10.6 C (51.1 F) | tie | 48 years | 5 of 100 (Routine) |
| 5 September 2010 | San Francisco Tlalcilalcalpan, MX | daily high min (Tie) | 11.7 C (53.1 F) | tie | 36 years | 4 of 100 (Routine) |
| 1 September 2010 | San Francisco Tlalcilalcalpan, MX | daily high min | 11.7 C (53.1 F) | 1.1 C (2.0 F) | 32 years | 21 of 100 (Routine) |
| 31 August 2010 | San Francisco Tlalcilalcalpan, MX | daily high min (Tie) | 10.6 C (51.1 F) | tie | 48 years | 5 of 100 (Routine) |
| 19 August 2010 | San Francisco Tlalcilalcalpan, MX | daily high min (Tie) | 10.6 C (51.1 F) | tie | 48 years | 5 of 100 (Routine) |
| 18 August 2010 | San Francisco Tlalcilalcalpan, MX | daily rain | 23.9 mm (0.9 in) | 8.9 mm (0.35 in) | 64 years | 20 of 100 (Routine) |
| 18 August 2010 | San Francisco Tlalcilalcalpan, MX | daily high min (Tie) | 10.6 C (51.1 F) | tie | 52 years | 5 of 100 (Routine) |
| 17 August 2010 | San Francisco Tlalcilalcalpan, MX | daily high min (Tie) | 11.7 C (53.1 F) | tie | 1 year | 1 of 100 (Routine) |
| 14 August 2010 | San Francisco Tlalcilalcalpan, MX | daily high min (Tie) | 11.7 C (53.1 F) | tie | 4 years | 2 of 100 (Routine) |
| 13 August 2010 | San Francisco Tlalcilalcalpan, MX | daily high min (Tie) | 10.6 C (51.1 F) | tie | 37 years | 4 of 100 (Routine) |
| 12 August 2010 | San Francisco Tlalcilalcalpan, MX | daily rain | 27.7 mm (1.1 in) | 4.3 mm (0.17 in) | 11 years | 16 of 100 (Routine) |
| 7 August 2010 | San Francisco Tlalcilalcalpan, MX | daily high min (Tie) | 10.6 C (51.1 F) | tie | 15 years | 2 of 100 (Routine) |
Climate Trend
50 complete years, 1954 to 2009| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1954 | 13.8 C | +0.46 C |
| 1956 | 13.4 C | +0.07 C |
| 1957 | 13.8 C | +0.43 C |
| 1958 | 13.5 C | +0.18 C |
| 1959 | 13.5 C | +0.17 C |
| 1960 | 13.7 C | +0.39 C |
| 1961 | 13.3 C | -0.02 C |
| 1962 | 13.8 C | +0.46 C |
| 1963 | 13.7 C | +0.37 C |
| 1965 | 13.4 C | +0.08 C |
| 1966 | 13.1 C | -0.26 C |
| 1967 | 13.0 C | -0.29 C |
| 1968 | 13.1 C | -0.21 C |
| 1969 | 13.8 C | +0.51 C |
| 1970 | 13.5 C | +0.13 C |
| 1971 | 15.1 C | +1.78 C |
| 1972 | 16.3 C | +2.93 C |
| 1973 | 13.4 C | +0.10 C |
| 1974 | 12.2 C | -1.12 C |
| 1975 | 11.0 C | -2.32 C |
| 1976 | 13.0 C | -0.35 C |
| 1977 | 13.3 C | -0.02 C |
| 1978 | 13.4 C | +0.07 C |
| 1979 | 13.6 C | +0.22 C |
| 1980 | 13.4 C | +0.10 C |
| 1981 | 13.4 C | +0.02 C |
| 1982 | 13.4 C | +0.06 C |
| 1984 | 12.8 C | -0.51 C |
| 1985 | 12.5 C | -0.87 C |
| 1986 | 12.4 C | -0.91 C |
| 1987 | 13.2 C | -0.10 C |
| 1988 | 13.0 C | -0.30 C |
| 1989 | 12.5 C | -0.83 C |
| 1990 | 13.1 C | -0.24 C |
| 1991 | 13.3 C | 0.00 C |
| 1992 | 12.4 C | -0.96 C |
| 1993 | 12.9 C | -0.42 C |
| 1994 | 13.2 C | -0.16 C |
| 1995 | 13.3 C | -0.03 C |
| 1996 | 13.0 C | -0.31 C |
| 1997 | 13.0 C | -0.37 C |
| 1998 | 13.7 C | +0.41 C |
| 1999 | 12.8 C | -0.53 C |
| 2000 | 13.1 C | -0.23 C |
| 2003 | 13.9 C | +0.54 C |
| 2004 | 13.2 C | -0.14 C |
| 2005 | 13.7 C | +0.39 C |
| 2007 | 13.9 C | +0.53 C |
| 2008 | 13.7 C | +0.41 C |
| 2009 | 14.3 C | +0.93 C |
The fitted trend in annual mean temperature here over 1954 to 2009 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 (-0.3 to 0.1) per decade. The slope is a straight line fitted to 50 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 (-0.3 to 0.1) per decade | 1954 to 2009 | 50 | Not clearly different from zero |
| Mean daily maximum | -0.27 C (-0.50 to -0.04) per decade | -0.5 F (-0.9 to -0.1) per decade | 1954 to 2009 | 50 | Fall |
| Mean daily minimum | 0.17 C (0.04 to 0.30) per decade | 0.3 F (0.1 to 0.5) per decade | 1954 to 2009 | 50 | 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
1939 to 2010| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 38.9 C (102.0 F) | 1945 | 27.8 C (82.0 F) | 70 |
| Coldest night (TNn) | -10.0 C (14.0 F) | 1940 | -1.9 C (28.5 F) | 70 |
| Wettest day (Rx1day) | 199.9 mm (7.9 in) | 1951 | 38.1 mm (1.5 in) | 70 |
| Wettest five days (Rx5day) | 309.7 mm (12.2 in) | 1951 | 77.7 mm (3.1 in) | 70 |
| Longest dry spell (CDD) | 127 days | 1998 | 44 days | 70 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1939 | 27.8 C (82.0 F) |
| 1940 | 28.9 C (84.0 F) |
| 1941 | 27.8 C (82.0 F) |
| 1944 | 30.0 C (86.0 F) |
| 1945 | 38.9 C (102.0 F) |
| 1946 | 30.0 C (86.0 F) |
| 1947 | 27.8 C (82.0 F) |
| 1948 | 28.9 C (84.0 F) |
| 1949 | 31.7 C (89.1 F) |
| 1950 | 29.4 C (84.9 F) |
| 1951 | 28.9 C (84.0 F) |
| 1952 | 28.9 C (84.0 F) |
| 1953 | 31.7 C (89.1 F) |
| 1954 | 30.0 C (86.0 F) |
| 1955 | 30.0 C (86.0 F) |
| 1956 | 28.9 C (84.0 F) |
| 1957 | 28.9 C (84.0 F) |
| 1958 | 27.8 C (82.0 F) |
| 1959 | 29.4 C (84.9 F) |
| 1960 | 27.8 C (82.0 F) |
| 1961 | 30.0 C (86.0 F) |
| 1962 | 27.8 C (82.0 F) |
| 1963 | 28.3 C (82.9 F) |
| 1964 | 31.1 C (88.0 F) |
| 1965 | 28.9 C (84.0 F) |
| 1966 | 27.8 C (82.0 F) |
| 1967 | 28.9 C (84.0 F) |
| 1968 | 28.9 C (84.0 F) |
| 1969 | 30.0 C (86.0 F) |
| 1970 | 30.6 C (87.1 F) |
| 1971 | 36.7 C (98.1 F) |
| 1972 | 35.0 C (95.0 F) |
| 1973 | 28.9 C (84.0 F) |
| 1974 | 35.6 C (96.1 F) |
| 1975 | 27.8 C (82.0 F) |
| 1976 | 31.7 C (89.1 F) |
| 1977 | 27.8 C (82.0 F) |
| 1978 | 28.9 C (84.0 F) |
| 1979 | 26.7 C (80.1 F) |
| 1980 | 27.8 C (82.0 F) |
| 1981 | 27.8 C (82.0 F) |
| 1982 | 28.9 C (84.0 F) |
| 1983 | 30.0 C (86.0 F) |
| 1984 | 26.7 C (80.1 F) |
| 1985 | 27.8 C (82.0 F) |
| 1986 | 27.8 C (82.0 F) |
| 1987 | 25.6 C (78.1 F) |
| 1988 | 27.8 C (82.0 F) |
| 1989 | 26.7 C (80.1 F) |
| 1990 | 25.6 C (78.1 F) |
| 1991 | 28.9 C (84.0 F) |
| 1992 | 25.6 C (78.1 F) |
| 1993 | 26.7 C (80.1 F) |
| 1994 | 26.7 C (80.1 F) |
| 1995 | 26.7 C (80.1 F) |
| 1996 | 26.7 C (80.1 F) |
| 1997 | 25.6 C (78.1 F) |
| 1998 | 30.6 C (87.1 F) |
| 1999 | 27.8 C (82.0 F) |
| 2000 | 26.7 C (80.1 F) |
| 2001 | 27.8 C (82.0 F) |
| 2002 | 27.8 C (82.0 F) |
| 2003 | 28.9 C (84.0 F) |
| 2004 | 25.6 C (78.1 F) |
| 2005 | 27.8 C (82.0 F) |
| 2006 | 27.8 C (82.0 F) |
| 2007 | 26.7 C (80.1 F) |
| 2008 | 26.7 C (80.1 F) |
| 2009 | 26.7 C (80.1 F) |
| 2010 | 27.8 C (82.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1939 | 0.0 C (32.0 F) |
| 1940 | -10.0 C (14.0 F) |
| 1941 | -5.0 C (23.0 F) |
| 1944 | -2.2 C (28.0 F) |
| 1945 | 0.0 C (32.0 F) |
| 1946 | -1.1 C (30.0 F) |
| 1947 | -1.1 C (30.0 F) |
| 1948 | 0.0 C (32.0 F) |
| 1949 | 0.0 C (32.0 F) |
| 1950 | 0.0 C (32.0 F) |
| 1951 | 0.0 C (32.0 F) |
| 1952 | 0.0 C (32.0 F) |
| 1953 | 5.6 C (42.1 F) |
| 1954 | 0.6 C (33.1 F) |
| 1955 | -8.9 C (16.0 F) |
| 1956 | -3.3 C (26.1 F) |
| 1957 | -2.8 C (27.0 F) |
| 1958 | 0.0 C (32.0 F) |
| 1959 | -4.4 C (24.1 F) |
| 1960 | 0.0 C (32.0 F) |
| 1961 | -1.7 C (28.9 F) |
| 1962 | 0.0 C (32.0 F) |
| 1963 | 0.0 C (32.0 F) |
| 1964 | 0.0 C (32.0 F) |
| 1965 | 0.0 C (32.0 F) |
| 1966 | 0.0 C (32.0 F) |
| 1967 | 0.0 C (32.0 F) |
| 1968 | -7.2 C (19.0 F) |
| 1969 | 0.0 C (32.0 F) |
| 1970 | 0.0 C (32.0 F) |
| 1971 | 0.0 C (32.0 F) |
| 1972 | 0.0 C (32.0 F) |
| 1973 | 0.0 C (32.0 F) |
| 1974 | -2.2 C (28.0 F) |
| 1975 | -2.2 C (28.0 F) |
| 1976 | -1.1 C (30.0 F) |
| 1977 | 0.0 C (32.0 F) |
| 1978 | -5.0 C (23.0 F) |
| 1979 | 0.0 C (32.0 F) |
| 1980 | -2.2 C (28.0 F) |
| 1981 | -3.3 C (26.1 F) |
| 1982 | -3.3 C (26.1 F) |
| 1983 | -5.0 C (23.0 F) |
| 1984 | -3.3 C (26.1 F) |
| 1985 | -1.7 C (28.9 F) |
| 1986 | -4.4 C (24.1 F) |
| 1987 | -3.3 C (26.1 F) |
| 1988 | -5.0 C (23.0 F) |
| 1989 | -4.4 C (24.1 F) |
| 1990 | -2.2 C (28.0 F) |
| 1991 | -2.2 C (28.0 F) |
| 1992 | -2.2 C (28.0 F) |
| 1993 | -1.1 C (30.0 F) |
| 1994 | 0.0 C (32.0 F) |
| 1995 | -1.1 C (30.0 F) |
| 1996 | -2.2 C (28.0 F) |
| 1997 | -4.4 C (24.1 F) |
| 1998 | -3.3 C (26.1 F) |
| 1999 | -3.3 C (26.1 F) |
| 2000 | -3.3 C (26.1 F) |
| 2001 | -2.2 C (28.0 F) |
| 2002 | -3.3 C (26.1 F) |
| 2003 | -1.1 C (30.0 F) |
| 2004 | -3.3 C (26.1 F) |
| 2005 | -2.2 C (28.0 F) |
| 2006 | -2.2 C (28.0 F) |
| 2007 | 0.0 C (32.0 F) |
| 2008 | -2.8 C (27.0 F) |
| 2009 | 0.0 C (32.0 F) |
| 2010 | -3.3 C (26.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1939 | 49.3 mm (1.9 in) |
| 1940 | 39.9 mm (1.6 in) |
| 1941 | 47.5 mm (1.9 in) |
| 1944 | 51.8 mm (2.0 in) |
| 1945 | 36.8 mm (1.4 in) |
| 1946 | 33.8 mm (1.3 in) |
| 1947 | 74.9 mm (2.9 in) |
| 1948 | 40.9 mm (1.6 in) |
| 1949 | 17.8 mm (0.7 in) |
| 1950 | 0.8 mm (0.03 in) |
| 1951 | 199.9 mm (7.9 in) |
| 1952 | 35.8 mm (1.4 in) |
| 1953 | 25.9 mm (1.0 in) |
| 1954 | 36.3 mm (1.4 in) |
| 1955 | 34.8 mm (1.4 in) |
| 1956 | 41.4 mm (1.6 in) |
| 1957 | 41.9 mm (1.6 in) |
| 1958 | 42.4 mm (1.7 in) |
| 1959 | 28.4 mm (1.1 in) |
| 1960 | 54.9 mm (2.2 in) |
| 1961 | 54.9 mm (2.2 in) |
| 1962 | 59.9 mm (2.4 in) |
| 1963 | 33.8 mm (1.3 in) |
| 1964 | 37.3 mm (1.5 in) |
| 1965 | 32.8 mm (1.3 in) |
| 1966 | 35.8 mm (1.4 in) |
| 1967 | 45.0 mm (1.8 in) |
| 1968 | 42.4 mm (1.7 in) |
| 1969 | 45.0 mm (1.8 in) |
| 1970 | 33.8 mm (1.3 in) |
| 1971 | 64.8 mm (2.6 in) |
| 1972 | 31.5 mm (1.2 in) |
| 1973 | 25.9 mm (1.0 in) |
| 1974 | 22.9 mm (0.9 in) |
| 1975 | 32.3 mm (1.3 in) |
| 1976 | 89.9 mm (3.5 in) |
| 1977 | 70.1 mm (2.8 in) |
| 1978 | 33.0 mm (1.3 in) |
| 1979 | 34.8 mm (1.4 in) |
| 1980 | 35.1 mm (1.4 in) |
| 1981 | 47.5 mm (1.9 in) |
| 1982 | 38.9 mm (1.5 in) |
| 1983 | 40.6 mm (1.6 in) |
| 1984 | 41.7 mm (1.6 in) |
| 1985 | 37.1 mm (1.5 in) |
| 1986 | 46.7 mm (1.8 in) |
| 1987 | 35.3 mm (1.4 in) |
| 1988 | 31.0 mm (1.2 in) |
| 1989 | 34.0 mm (1.3 in) |
| 1990 | 39.6 mm (1.6 in) |
| 1991 | 34.8 mm (1.4 in) |
| 1992 | 45.0 mm (1.8 in) |
| 1993 | 28.2 mm (1.1 in) |
| 1994 | 33.0 mm (1.3 in) |
| 1995 | 48.8 mm (1.9 in) |
| 1996 | 38.9 mm (1.5 in) |
| 1997 | 46.0 mm (1.8 in) |
| 1998 | 35.1 mm (1.4 in) |
| 1999 | 25.1 mm (1.0 in) |
| 2000 | 47.5 mm (1.9 in) |
| 2001 | 27.2 mm (1.1 in) |
| 2002 | 39.4 mm (1.6 in) |
| 2003 | 25.4 mm (1.0 in) |
| 2004 | 39.9 mm (1.6 in) |
| 2005 | 28.4 mm (1.1 in) |
| 2006 | 75.7 mm (3.0 in) |
| 2007 | 31.8 mm (1.3 in) |
| 2008 | 30.7 mm (1.2 in) |
| 2009 | 38.9 mm (1.5 in) |
| 2010 | 45.5 mm (1.8 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1939 | 80.2 mm (3.2 in) |
| 1940 | 79.8 mm (3.1 in) |
| 1941 | 110.0 mm (4.3 in) |
| 1944 | 91.1 mm (3.6 in) |
| 1945 | 53.3 mm (2.1 in) |
| 1946 | 55.9 mm (2.2 in) |
| 1947 | 158.5 mm (6.2 in) |
| 1948 | 75.7 mm (3.0 in) |
| 1949 | 33.6 mm (1.3 in) |
| 1950 | 0.8 mm (0.03 in) |
| 1951 | 309.7 mm (12.2 in) |
| 1952 | 63.3 mm (2.5 in) |
| 1953 | 63.2 mm (2.5 in) |
| 1954 | 58.2 mm (2.3 in) |
| 1955 | 72.8 mm (2.9 in) |
| 1956 | 69.3 mm (2.7 in) |
| 1957 | 80.8 mm (3.2 in) |
| 1958 | 93.5 mm (3.7 in) |
| 1959 | 86.6 mm (3.4 in) |
| 1960 | 105.5 mm (4.2 in) |
| 1961 | 102.4 mm (4.0 in) |
| 1962 | 97.5 mm (3.8 in) |
| 1963 | 62.5 mm (2.5 in) |
| 1964 | 66.6 mm (2.6 in) |
| 1965 | 78.1 mm (3.1 in) |
| 1966 | 56.6 mm (2.2 in) |
| 1967 | 77.8 mm (3.1 in) |
| 1968 | 101.3 mm (4.0 in) |
| 1969 | 103.2 mm (4.1 in) |
| 1970 | 55.9 mm (2.2 in) |
| 1971 | 96.3 mm (3.8 in) |
| 1972 | 54.1 mm (2.1 in) |
| 1973 | 44.2 mm (1.7 in) |
| 1974 | 53.2 mm (2.1 in) |
| 1975 | 64.8 mm (2.6 in) |
| 1976 | 229.1 mm (9.0 in) |
| 1977 | 90.5 mm (3.6 in) |
| 1978 | 77.5 mm (3.1 in) |
| 1979 | 80.5 mm (3.2 in) |
| 1980 | 75.8 mm (3.0 in) |
| 1981 | 61.3 mm (2.4 in) |
| 1982 | 57.8 mm (2.3 in) |
| 1983 | 63.1 mm (2.5 in) |
| 1984 | 91.3 mm (3.6 in) |
| 1985 | 56.8 mm (2.2 in) |
| 1986 | 89.7 mm (3.5 in) |
| 1987 | 76.2 mm (3.0 in) |
| 1988 | 84.1 mm (3.3 in) |
| 1989 | 70.9 mm (2.8 in) |
| 1990 | 66.3 mm (2.6 in) |
| 1991 | 99.1 mm (3.9 in) |
| 1992 | 68.9 mm (2.7 in) |
| 1993 | 101.4 mm (4.0 in) |
| 1994 | 68.2 mm (2.7 in) |
| 1995 | 95.9 mm (3.8 in) |
| 1996 | 72.7 mm (2.9 in) |
| 1997 | 97.5 mm (3.8 in) |
| 1998 | 91.0 mm (3.6 in) |
| 1999 | 74.2 mm (2.9 in) |
| 2000 | 115.6 mm (4.6 in) |
| 2001 | 54.1 mm (2.1 in) |
| 2002 | 84.7 mm (3.3 in) |
| 2003 | 88.5 mm (3.5 in) |
| 2004 | 66.4 mm (2.6 in) |
| 2005 | 88.0 mm (3.5 in) |
| 2006 | 86.9 mm (3.4 in) |
| 2007 | 68.2 mm (2.7 in) |
| 2008 | 68.6 mm (2.7 in) |
| 2009 | 86.4 mm (3.4 in) |
| 2010 | 110.3 mm (4.3 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1939 | 27 days |
| 1940 | 48 days |
| 1941 | 35 days |
| 1944 | 52 days |
| 1945 | 12 days |
| 1946 | 33 days |
| 1947 | 6 days |
| 1948 | 8 days |
| 1949 | 7 days |
| 1950 | 34 days |
| 1951 | 54 days |
| 1952 | 97 days |
| 1953 | 67 days |
| 1954 | 41 days |
| 1955 | 34 days |
| 1956 | 68 days |
| 1957 | 50 days |
| 1958 | 30 days |
| 1959 | 45 days |
| 1960 | 52 days |
| 1961 | 41 days |
| 1962 | 76 days |
| 1963 | 79 days |
| 1964 | 44 days |
| 1965 | 40 days |
| 1966 | 43 days |
| 1967 | 32 days |
| 1968 | 38 days |
| 1969 | 65 days |
| 1970 | 56 days |
| 1971 | 63 days |
| 1972 | 36 days |
| 1973 | 94 days |
| 1974 | 37 days |
| 1975 | 61 days |
| 1976 | 58 days |
| 1977 | 31 days |
| 1978 | 28 days |
| 1979 | 41 days |
| 1980 | 32 days |
| 1981 | 26 days |
| 1982 | 52 days |
| 1983 | 27 days |
| 1984 | 43 days |
| 1985 | 44 days |
| 1986 | 95 days |
| 1987 | 45 days |
| 1988 | 53 days |
| 1989 | 42 days |
| 1990 | 65 days |
| 1991 | 43 days |
| 1992 | 37 days |
| 1993 | 59 days |
| 1994 | 46 days |
| 1995 | 38 days |
| 1996 | 109 days |
| 1997 | 25 days |
| 1998 | 127 days |
| 1999 | 35 days |
| 2000 | 47 days |
| 2001 | 43 days |
| 2002 | 51 days |
| 2003 | 59 days |
| 2004 | 75 days |
| 2005 | 50 days |
| 2006 | 64 days |
| 2007 | 33 days |
| 2008 | 66 days |
| 2009 | 41 days |
| 2010 | 44 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
42 years with a frostAcross 42 years with a frost, the median last spring frost at San Francisco Tlalcilalcalpan falls on 20 February and the median first autumn frost on 13 November, which leaves a median of 268 days between them.
Fitted over all years, the growing season changes by +11.9 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1971 to 2009) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 20 February | n/a | 15 February | n/a | -4.9 days per decade |
| First autumn frost | 13 November | n/a | 18 November | n/a | +7.0 days per decade |
| Growing days | 268 days | n/a | 272 days | n/a | +11.9 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
56 years, 1940 to 2010A day with at least 37.6 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 87.3 mm (3.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 37.6 mm (1.5 in) | |
| 5 years | 47.8 mm (1.9 in) | |
| 10 years | 55.7 mm (2.2 in) | |
| 25 years | 67.0 mm (2.6 in) | |
| 50 years | 76.6 mm (3.0 in) | |
| 100 years | 87.3 mm (3.4 in) | Longer than the 56 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, 56 years of values from 1940 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: 89.9 mm (3.5 in) in 1976; 75.7 mm (3.0 in) in 2006; 70.1 mm (2.8 in) in 1977.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
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).