San Francisco de Los Romo (Sm Weather Records (MXN00001025)
Record envelope, standing records and threshold days for San Francisco de Los Romo (Sm (MXN00001025), Mexico, with 58 years of record.
Key Facts for San Francisco de Los Romo (Sm
- San Francisco de Los Romo (Sm (MXN00001025) is a weather station in Mexico at 22.07 latitude and -102.27 longitude, 1,880 m (6,167 ft) above sea level.
- The station reports from 1926 to 1983, 58 years of record.
- 1,464 records set at San Francisco de Los Romo (Sm still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- San Francisco de Los Romo (Sm set a daily record high minimum temperature of 10.6 C (51.1 F) on 27 December 1983.
About the Station
- Location: Mexico, 22.07 latitude, -102.27 longitude.
- Elevation: 1,880 m (6,167 ft).
- Period of record: 1926 to 1983, 58 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 | 35.0 C (95.0 F) | -8.3 C (17.1 F) | n/a | n/a |
| Feb | 36.7 C (98.1 F) | -6.7 C (19.9 F) | n/a | n/a |
| Mar | 38.9 C (102.0 F) | -6.7 C (19.9 F) | n/a | n/a |
| Apr | 42.8 C (109.0 F) | -1.1 C (30.0 F) | n/a | n/a |
| May | 43.9 C (111.0 F) | 1.7 C (35.1 F) | n/a | n/a |
| Jun | 41.7 C (107.1 F) | 5.0 C (41.0 F) | n/a | n/a |
| Jul | 40.0 C (104.0 F) | 5.0 C (41.0 F) | n/a | n/a |
| Aug | 38.9 C (102.0 F) | 5.0 C (41.0 F) | n/a | n/a |
| Sep | 37.8 C (100.0 F) | 1.7 C (35.1 F) | n/a | n/a |
| Oct | 38.9 C (102.0 F) | -4.4 C (24.1 F) | n/a | n/a |
| Nov | 33.9 C (93.0 F) | -4.4 C (24.1 F) | n/a | n/a |
| Dec | 35.0 C (95.0 F) | -6.1 C (21.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1926 | 16 |
| 1927 | 51 |
| 1928 | 46 |
| 1929 | 66 |
| 1930 | 48 |
| 1931 | 39 |
| 1932 | 13 |
| 1944 | 20 |
| 1945 | 35 |
| 1946 | 41 |
| 1947 | 43 |
| 1948 | 29 |
| 1949 | 23 |
| 1950 | 18 |
| 1951 | 29 |
| 1952 | 27 |
| 1953 | 52 |
| 1954 | 21 |
| 1955 | 12 |
| 1956 | 13 |
| 1957 | 45 |
| 1958 | 40 |
| 1959 | 17 |
| 1960 | 28 |
| 1961 | 15 |
| 1962 | 13 |
| 1963 | 23 |
| 1964 | 17 |
| 1965 | 22 |
| 1966 | 23 |
| 1967 | 26 |
| 1968 | 24 |
| 1969 | 14 |
| 1970 | 19 |
| 1971 | 11 |
| 1972 | 24 |
| 1973 | 14 |
| 1974 | 13 |
| 1975 | 21 |
| 1976 | 64 |
| 1977 | 104 |
| 1978 | 77 |
| 1979 | 95 |
| 1980 | 29 |
| 1981 | 13 |
| 1982 | 12 |
| 1983 | 19 |
All-Time Record Progression
4 new records| Date | Kind | Detail |
|---|---|---|
| 1978-04-19 | Record high maximum temperature | Record high maximum temperature 42.8 C (109.0 F) |
| 1979-05-18 | Record high maximum temperature | Record high maximum temperature 43.9 C (111.0 F) |
| 1980-01-23 | Record low maximum temperature | Record low maximum temperature 6.7 C (44.1 F) |
| 1980-09-06 | Record daily precipitation | Record daily precipitation 80.3 mm (3.2 in) |
Wettest Day of Each Month
Sep: 80.3 mm (3.2 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 31.0 mm (1.2 in) | 3 January 1958 |
| Feb | 31.8 mm (1.3 in) | 25 February 1980 |
| Mar | 43.9 mm (1.7 in) | 4 March 1968 |
| Apr | 67.8 mm (2.7 in) | 27 April 1967 |
| May | 45.0 mm (1.8 in) | 25 May 1971 |
| Jun | 61.0 mm (2.4 in) | 25 June 1956 |
| Jul | 68.8 mm (2.7 in) | 10 July 1930 |
| Aug | 78.0 mm (3.1 in) | 6 August 1944 |
| Sep | 80.3 mm (3.2 in) | 6 September 1980 |
| Oct | 46.5 mm (1.8 in) | 23 October 1951 |
| Nov | 46.0 mm (1.8 in) | 2 November 1958 |
| Dec | 42.9 mm (1.7 in) | 2 December 1979 |
Period of Record Coverage
1926 to 1983| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1926 | 189 | 52% | No |
| 1927 | 365 | 100% | Yes |
| 1928 | 366 | 100% | Yes |
| 1929 | 365 | 100% | Yes |
| 1930 | 365 | 100% | Yes |
| 1931 | 365 | 100% | Yes |
| 1932 | 91 | 25% | No |
| 1944 | 183 | 50% | No |
| 1945 | 365 | 100% | Yes |
| 1946 | 363 | 99% | Yes |
| 1947 | 363 | 99% | Yes |
| 1948 | 365 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 362 | 99% | Yes |
| 1954 | 364 | 100% | Yes |
| 1955 | 363 | 99% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 361 | 99% | Yes |
| 1958 | 271 | 74% | No |
| 1959 | 364 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 363 | 99% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 365 | 100% | Yes |
| 1965 | 364 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 364 | 100% | Yes |
| 1968 | 365 | 100% | Yes |
| 1969 | 358 | 98% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 333 | 91% | Yes |
| 1972 | 365 | 100% | Yes |
| 1973 | 362 | 99% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 334 | 91% | Yes |
| 1977 | 363 | 99% | Yes |
| 1978 | 361 | 99% | Yes |
| 1979 | 360 | 99% | Yes |
| 1980 | 329 | 90% | No |
| 1981 | 335 | 92% | Yes |
| 1982 | 245 | 67% | No |
| 1983 | 303 | 83% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 27 December 1983 | San Francisco de Los Romo (Sm, MX | daily high min | 10.6 C (51.1 F) | 1.2 C (2.2 F) | 33 years | 18 of 100 (Routine) |
| 25 December 1983 | San Francisco de Los Romo (Sm, MX | daily high max (Tie) | 30.0 C (86.0 F) | tie | 32 years | 3 of 100 (Routine) |
| 15 December 1983 | San Francisco de Los Romo (Sm, MX | daily low min (Tie) | 0.0 C (32.0 F) | tie | 38 years | 4 of 100 (Routine) |
| 13 December 1983 | San Francisco de Los Romo (Sm, MX | daily high max (Tie) | 30.0 C (86.0 F) | tie | 5 years | 1 of 100 (Routine) |
| 12 December 1983 | San Francisco de Los Romo (Sm, MX | daily high max | 30.0 C (86.0 F) | 1.1 C (2.0 F) | 5 years | 8 of 100 (Routine) |
| 8 December 1983 | San Francisco de Los Romo (Sm, MX | daily high max | 30.0 C (86.0 F) | 1.1 C (2.0 F) | 4 years | 8 of 100 (Routine) |
| 26 October 1983 | San Francisco de Los Romo (Sm, MX | daily high min | 13.9 C (57.0 F) | 1.1 C (2.0 F) | 25 years | 15 of 100 (Routine) |
| 19 October 1983 | San Francisco de Los Romo (Sm, MX | daily high min | 15.6 C (60.1 F) | 1.2 C (2.2 F) | 25 years | 15 of 100 (Routine) |
| 12 October 1983 | San Francisco de Los Romo (Sm, MX | daily rain | 14.0 mm (0.6 in) | 1.0 mm (0.04 in) | 28 years | 14 of 100 (Routine) |
| 3 October 1983 | San Francisco de Los Romo (Sm, MX | daily high max (Tie) | 33.9 C (93.0 F) | tie | 4 years | 1 of 100 (Routine) |
| 16 September 1983 | San Francisco de Los Romo (Sm, MX | daily high min (Tie) | 16.7 C (62.1 F) | tie | 30 years | 3 of 100 (Routine) |
| 12 September 1983 | San Francisco de Los Romo (Sm, MX | daily rain | 33.8 mm (1.3 in) | 1.0 mm (0.04 in) | 12 years | 8 of 100 (Routine) |
| 12 September 1983 | San Francisco de Los Romo (Sm, MX | daily high min (Tie) | 16.7 C (62.1 F) | tie | 32 years | 3 of 100 (Routine) |
| 10 September 1983 | San Francisco de Los Romo (Sm, MX | daily high min (Tie) | 16.7 C (62.1 F) | tie | 30 years | 3 of 100 (Routine) |
| 9 September 1983 | San Francisco de Los Romo (Sm, MX | daily high min | 17.8 C (64.0 F) | 0.6 C (1.1 F) | 34 years | 17 of 100 (Routine) |
| 8 September 1983 | San Francisco de Los Romo (Sm, MX | daily high min (Tie) | 17.8 C (64.0 F) | tie | 25 years | 3 of 100 (Routine) |
| 6 September 1983 | San Francisco de Los Romo (Sm, MX | daily high max (Tie) | 33.9 C (93.0 F) | tie | 37 years | 4 of 100 (Routine) |
| 19 July 1983 | San Francisco de Los Romo (Sm, MX | daily high min (Tie) | 16.7 C (62.1 F) | tie | 2 years | 1 of 100 (Routine) |
| 17 July 1983 | San Francisco de Los Romo (Sm, MX | monthly high min | 18.9 C (66.0 F) | 0.6 C (1.1 F) | 26 years | 24 of 100 (Routine) |
| 16 July 1983 | San Francisco de Los Romo (Sm, MX | daily high min | 17.8 C (64.0 F) | 1.1 C (2.0 F) | 38 years | 20 of 100 (Routine) |
Climate Trend
37 complete years, 1927 to 1979| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1927 | 16.5 C | -1.07 C |
| 1928 | 16.7 C | -0.88 C |
| 1929 | 16.4 C | -1.15 C |
| 1930 | 16.5 C | -1.07 C |
| 1931 | 16.5 C | -1.09 C |
| 1945 | 18.4 C | +0.84 C |
| 1946 | 18.5 C | +0.91 C |
| 1947 | 18.2 C | +0.59 C |
| 1948 | 18.4 C | +0.84 C |
| 1949 | 18.3 C | +0.74 C |
| 1950 | 18.3 C | +0.69 C |
| 1951 | 18.5 C | +0.94 C |
| 1952 | 18.2 C | +0.57 C |
| 1953 | 18.4 C | +0.82 C |
| 1954 | 18.8 C | +1.19 C |
| 1955 | 18.4 C | +0.83 C |
| 1956 | 18.1 C | +0.56 C |
| 1957 | 18.8 C | +1.26 C |
| 1959 | 17.1 C | -0.46 C |
| 1960 | 17.4 C | -0.19 C |
| 1961 | 16.9 C | -0.70 C |
| 1962 | 17.0 C | -0.61 C |
| 1963 | 17.1 C | -0.44 C |
| 1964 | 16.9 C | -0.68 C |
| 1965 | 16.7 C | -0.84 C |
| 1966 | 16.4 C | -1.20 C |
| 1967 | 16.6 C | -0.99 C |
| 1968 | 16.4 C | -1.16 C |
| 1969 | 17.6 C | 0.00 C |
| 1970 | 17.0 C | -0.63 C |
| 1972 | 17.6 C | +0.05 C |
| 1973 | 16.8 C | -0.81 C |
| 1974 | 16.2 C | -1.37 C |
| 1975 | 16.2 C | -1.42 C |
| 1977 | 19.8 C | +2.26 C |
| 1978 | 19.7 C | +2.14 C |
| 1979 | 19.3 C | +1.71 C |
The fitted trend in annual mean temperature here over 1927 to 1979 is 0.1 C (-0.1 to 0.4) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.2 to 0.6) per decade. The slope is a straight line fitted to 37 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 (-0.1 to 0.4) per decade | 0.2 F (-0.2 to 0.6) per decade | 1927 to 1979 | 37 | Not clearly different from zero |
| Mean daily maximum | 0.00 C (-0.41 to 0.40) per decade | -0.01 F (-0.75 to 0.73) per decade | 1927 to 1979 | 37 | Not clearly different from zero |
| Mean daily minimum | 0.2 C (-0.1 to 0.5) per decade | 0.4 F (-0.1 to 1.0) per decade | 1927 to 1979 | 37 | 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
1926 to 1983| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 43.9 C (111.0 F) | 1979 | 36.7 C (98.1 F) | 47 |
| Coldest night (TNn) | -8.3 C (17.1 F) | 1927 | 0.0 C (32.0 F) | 47 |
| Wettest day (Rx1day) | 80.3 mm (3.2 in) | 1980 | 39.9 mm (1.6 in) | 50 |
| Wettest five days (Rx5day) | 136.4 mm (5.4 in) | 1970 | 73.9 mm (2.9 in) | 50 |
| Longest dry spell (CDD) | 152 days | 1929 | 80 days | 50 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1926 | 31.7 C (89.1 F) |
| 1927 | 36.1 C (97.0 F) |
| 1928 | 38.3 C (100.9 F) |
| 1929 | 38.9 C (102.0 F) |
| 1930 | 37.8 C (100.0 F) |
| 1931 | 33.9 C (93.0 F) |
| 1932 | 32.2 C (90.0 F) |
| 1941 | n/a |
| 1942 | n/a |
| 1943 | n/a |
| 1944 | 32.8 C (91.0 F) |
| 1945 | 37.8 C (100.0 F) |
| 1946 | 36.7 C (98.1 F) |
| 1947 | 36.1 C (97.0 F) |
| 1948 | 36.7 C (98.1 F) |
| 1949 | 37.2 C (99.0 F) |
| 1950 | 37.8 C (100.0 F) |
| 1951 | 35.6 C (96.1 F) |
| 1952 | 36.7 C (98.1 F) |
| 1953 | 38.9 C (102.0 F) |
| 1954 | 41.7 C (107.1 F) |
| 1955 | 39.4 C (102.9 F) |
| 1956 | 37.2 C (99.0 F) |
| 1957 | 39.4 C (102.9 F) |
| 1958 | 33.9 C (93.0 F) |
| 1959 | 35.0 C (95.0 F) |
| 1960 | 36.7 C (98.1 F) |
| 1961 | 37.8 C (100.0 F) |
| 1962 | 36.7 C (98.1 F) |
| 1963 | 37.8 C (100.0 F) |
| 1964 | 35.6 C (96.1 F) |
| 1965 | 35.6 C (96.1 F) |
| 1966 | 35.0 C (95.0 F) |
| 1967 | 36.7 C (98.1 F) |
| 1968 | 35.0 C (95.0 F) |
| 1969 | 36.7 C (98.1 F) |
| 1970 | 36.7 C (98.1 F) |
| 1971 | 36.7 C (98.1 F) |
| 1972 | 38.9 C (102.0 F) |
| 1973 | 36.7 C (98.1 F) |
| 1974 | 35.0 C (95.0 F) |
| 1975 | 32.8 C (91.0 F) |
| 1976 | 41.7 C (107.1 F) |
| 1977 | 40.0 C (104.0 F) |
| 1978 | 42.8 C (109.0 F) |
| 1979 | 43.9 C (111.0 F) |
| 1980 | 38.9 C (102.0 F) |
| 1981 | 36.7 C (98.1 F) |
| 1982 | 37.8 C (100.0 F) |
| 1983 | 37.8 C (100.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1926 | -6.1 C (21.0 F) |
| 1927 | -8.3 C (17.1 F) |
| 1928 | -5.6 C (21.9 F) |
| 1929 | -6.7 C (19.9 F) |
| 1930 | -6.7 C (19.9 F) |
| 1931 | -5.6 C (21.9 F) |
| 1932 | -7.8 C (18.0 F) |
| 1941 | n/a |
| 1942 | n/a |
| 1943 | n/a |
| 1944 | 0.0 C (32.0 F) |
| 1945 | -6.1 C (21.0 F) |
| 1946 | 0.0 C (32.0 F) |
| 1947 | -0.6 C (30.9 F) |
| 1948 | 0.0 C (32.0 F) |
| 1949 | 0.0 C (32.0 F) |
| 1950 | -1.1 C (30.0 F) |
| 1951 | -1.7 C (28.9 F) |
| 1952 | 0.0 C (32.0 F) |
| 1953 | -6.1 C (21.0 F) |
| 1954 | -0.6 C (30.9 F) |
| 1955 | -2.8 C (27.0 F) |
| 1956 | 0.0 C (32.0 F) |
| 1957 | 0.0 C (32.0 F) |
| 1958 | 0.0 C (32.0 F) |
| 1959 | 0.0 C (32.0 F) |
| 1960 | -3.3 C (26.1 F) |
| 1961 | -0.6 C (30.9 F) |
| 1962 | -1.1 C (30.0 F) |
| 1963 | 0.0 C (32.0 F) |
| 1964 | -6.1 C (21.0 F) |
| 1965 | 0.0 C (32.0 F) |
| 1966 | 0.0 C (32.0 F) |
| 1967 | -0.6 C (30.9 F) |
| 1968 | 0.0 C (32.0 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 | 0.0 C (32.0 F) |
| 1975 | 0.0 C (32.0 F) |
| 1976 | 0.0 C (32.0 F) |
| 1977 | 0.0 C (32.0 F) |
| 1978 | 0.0 C (32.0 F) |
| 1979 | 0.0 C (32.0 F) |
| 1980 | 0.0 C (32.0 F) |
| 1981 | -4.4 C (24.1 F) |
| 1982 | 0.0 C (32.0 F) |
| 1983 | 0.0 C (32.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1926 | 36.8 mm (1.4 in) |
| 1927 | 46.0 mm (1.8 in) |
| 1928 | 39.9 mm (1.6 in) |
| 1929 | 14.5 mm (0.6 in) |
| 1930 | 68.8 mm (2.7 in) |
| 1931 | 46.0 mm (1.8 in) |
| 1932 | 22.9 mm (0.9 in) |
| 1941 | 8.9 mm (0.35 in) |
| 1942 | 33.8 mm (1.3 in) |
| 1943 | 50.8 mm (2.0 in) |
| 1944 | 78.0 mm (3.1 in) |
| 1945 | 55.9 mm (2.2 in) |
| 1946 | 30.0 mm (1.2 in) |
| 1947 | 31.8 mm (1.3 in) |
| 1948 | 38.4 mm (1.5 in) |
| 1949 | 23.9 mm (0.9 in) |
| 1950 | 30.0 mm (1.2 in) |
| 1951 | 46.5 mm (1.8 in) |
| 1952 | 43.9 mm (1.7 in) |
| 1953 | 30.0 mm (1.2 in) |
| 1954 | 47.8 mm (1.9 in) |
| 1955 | 34.3 mm (1.4 in) |
| 1956 | 61.0 mm (2.4 in) |
| 1957 | 26.4 mm (1.0 in) |
| 1958 | 47.0 mm (1.9 in) |
| 1959 | 45.5 mm (1.8 in) |
| 1960 | 38.9 mm (1.5 in) |
| 1961 | 34.8 mm (1.4 in) |
| 1962 | 38.9 mm (1.5 in) |
| 1963 | 41.9 mm (1.6 in) |
| 1964 | 40.9 mm (1.6 in) |
| 1965 | 36.8 mm (1.4 in) |
| 1966 | 39.9 mm (1.6 in) |
| 1967 | 67.8 mm (2.7 in) |
| 1968 | 63.8 mm (2.5 in) |
| 1969 | 34.8 mm (1.4 in) |
| 1970 | 74.9 mm (2.9 in) |
| 1971 | 45.0 mm (1.8 in) |
| 1972 | 50.8 mm (2.0 in) |
| 1973 | 54.9 mm (2.2 in) |
| 1974 | 39.9 mm (1.6 in) |
| 1975 | 23.9 mm (0.9 in) |
| 1976 | 22.9 mm (0.9 in) |
| 1977 | 27.9 mm (1.1 in) |
| 1978 | 23.9 mm (0.9 in) |
| 1979 | 42.9 mm (1.7 in) |
| 1980 | 80.3 mm (3.2 in) |
| 1981 | 31.8 mm (1.3 in) |
| 1982 | 25.9 mm (1.0 in) |
| 1983 | 42.9 mm (1.7 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1926 | 88.7 mm (3.5 in) |
| 1927 | 91.0 mm (3.6 in) |
| 1928 | 42.7 mm (1.7 in) |
| 1929 | 23.9 mm (0.9 in) |
| 1930 | 113.5 mm (4.5 in) |
| 1931 | 66.3 mm (2.6 in) |
| 1932 | 22.9 mm (0.9 in) |
| 1941 | 16.8 mm (0.7 in) |
| 1942 | 58.0 mm (2.3 in) |
| 1943 | 76.2 mm (3.0 in) |
| 1944 | 100.9 mm (4.0 in) |
| 1945 | 79.9 mm (3.1 in) |
| 1946 | 82.9 mm (3.3 in) |
| 1947 | 64.9 mm (2.6 in) |
| 1948 | 83.9 mm (3.3 in) |
| 1949 | 44.7 mm (1.8 in) |
| 1950 | 62.0 mm (2.4 in) |
| 1951 | 59.5 mm (2.3 in) |
| 1952 | 78.7 mm (3.1 in) |
| 1953 | 78.2 mm (3.1 in) |
| 1954 | 67.1 mm (2.6 in) |
| 1955 | 48.8 mm (1.9 in) |
| 1956 | 99.1 mm (3.9 in) |
| 1957 | 53.9 mm (2.1 in) |
| 1958 | 93.1 mm (3.7 in) |
| 1959 | 95.0 mm (3.7 in) |
| 1960 | 67.6 mm (2.7 in) |
| 1961 | 62.0 mm (2.4 in) |
| 1962 | 79.0 mm (3.1 in) |
| 1963 | 78.5 mm (3.1 in) |
| 1964 | 91.7 mm (3.6 in) |
| 1965 | 69.1 mm (2.7 in) |
| 1966 | 93.1 mm (3.7 in) |
| 1967 | 102.4 mm (4.0 in) |
| 1968 | 132.6 mm (5.2 in) |
| 1969 | 44.7 mm (1.8 in) |
| 1970 | 136.4 mm (5.4 in) |
| 1971 | 71.6 mm (2.8 in) |
| 1972 | 69.9 mm (2.8 in) |
| 1973 | 117.4 mm (4.6 in) |
| 1974 | 85.4 mm (3.4 in) |
| 1975 | 81.3 mm (3.2 in) |
| 1976 | 62.2 mm (2.4 in) |
| 1977 | 47.0 mm (1.9 in) |
| 1978 | 50.2 mm (2.0 in) |
| 1979 | 66.6 mm (2.6 in) |
| 1980 | 82.9 mm (3.3 in) |
| 1981 | 52.1 mm (2.1 in) |
| 1982 | 65.5 mm (2.6 in) |
| 1983 | 79.6 mm (3.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1926 | 61 days |
| 1927 | 114 days |
| 1928 | 70 days |
| 1929 | 152 days |
| 1930 | 73 days |
| 1931 | 84 days |
| 1932 | 47 days |
| 1941 | 18 days |
| 1942 | 91 days |
| 1943 | 113 days |
| 1944 | 59 days |
| 1945 | 92 days |
| 1946 | 50 days |
| 1947 | 109 days |
| 1948 | 61 days |
| 1949 | 123 days |
| 1950 | 68 days |
| 1951 | 75 days |
| 1952 | 108 days |
| 1953 | 98 days |
| 1954 | 129 days |
| 1955 | 132 days |
| 1956 | 113 days |
| 1957 | 81 days |
| 1958 | 74 days |
| 1959 | 97 days |
| 1960 | 101 days |
| 1961 | 69 days |
| 1962 | 69 days |
| 1963 | 58 days |
| 1964 | 109 days |
| 1965 | 42 days |
| 1966 | 65 days |
| 1967 | 37 days |
| 1968 | 35 days |
| 1969 | 127 days |
| 1970 | 97 days |
| 1971 | 133 days |
| 1972 | 48 days |
| 1973 | 85 days |
| 1974 | 50 days |
| 1975 | 119 days |
| 1976 | 91 days |
| 1977 | 79 days |
| 1978 | 121 days |
| 1979 | 73 days |
| 1980 | 55 days |
| 1981 | 71 days |
| 1982 | 78 days |
| 1983 | 127 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
35 years with a frostAcross 35 years with a frost, the median last spring frost at San Francisco de Los Romo (Sm falls on 23 March and the median first autumn frost on 13 November, which leaves a median of 242 days between them.
Fitted over all years, the growing season changes by +4.9 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1945 to 1979) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 23 March | n/a | 16 March | n/a | -2.0 days per decade |
| First autumn frost | 13 November | n/a | 14 November | n/a | +2.9 days per decade |
| Growing days | 242 days | n/a | 252 days | n/a | +4.9 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
45 years, 1927 to 1981A day with at least 40.4 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 90.8 mm (3.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 40.4 mm (1.6 in) | |
| 5 years | 54.2 mm (2.1 in) | |
| 10 years | 63.3 mm (2.5 in) | |
| 25 years | 74.5 mm (2.9 in) | |
| 50 years | 82.7 mm (3.3 in) | Longer than the 45 years of record |
| 100 years | 90.8 mm (3.6 in) | Longer than the 45 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, 45 years of values from 1927 to 1981.
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: 80.3 mm (3.2 in) in 1980; 78.0 mm (3.1 in) in 1944; 74.9 mm (2.9 in) in 1970.
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).