San Juan de Los Llanos Weather Records (MXN00011067)
Record envelope, standing records and threshold days for San Juan de Los Llanos (MXN00011067), Mexico, with 66 years of record.
Key Facts for San Juan de Los Llanos
- San Juan de Los Llanos (MXN00011067) is a weather station in Mexico at 21.28 latitude and -101.32 longitude, 2,020 m (6,627 ft) above sea level.
- The station reports from 1924 to 1989, 66 years of record.
- 1,460 records set at San Juan de Los Llanos still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- San Juan de Los Llanos set a daily record low minimum temperature of -5.0 C (23.0 F) on 24 December 1989.
About the Station
- Location: Mexico, 21.28 latitude, -101.32 longitude.
- Elevation: 2,020 m (6,627 ft).
- Period of record: 1924 to 1989, 66 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 | 32.8 C (91.0 F) | -8.3 C (17.1 F) | n/a | n/a |
| Feb | 35.0 C (95.0 F) | -10.0 C (14.0 F) | n/a | n/a |
| Mar | 36.7 C (98.1 F) | -7.2 C (19.0 F) | n/a | n/a |
| Apr | 38.9 C (102.0 F) | -4.4 C (24.1 F) | n/a | n/a |
| May | 41.1 C (106.0 F) | 1.1 C (34.0 F) | n/a | n/a |
| Jun | 41.7 C (107.1 F) | 2.8 C (37.0 F) | n/a | n/a |
| Jul | 36.7 C (98.1 F) | 3.3 C (37.9 F) | n/a | n/a |
| Aug | 36.1 C (97.0 F) | 1.7 C (35.1 F) | n/a | n/a |
| Sep | 37.2 C (99.0 F) | -0.6 C (30.9 F) | n/a | n/a |
| Oct | 35.0 C (95.0 F) | -2.8 C (27.0 F) | n/a | n/a |
| Nov | 33.9 C (93.0 F) | -8.3 C (17.1 F) | n/a | n/a |
| Dec | 36.1 C (97.0 F) | -6.1 C (21.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,460 standing records| Year set | Standing records |
|---|---|
| 1924 | 28 |
| 1925 | 95 |
| 1926 | 76 |
| 1927 | 47 |
| 1928 | 48 |
| 1929 | 53 |
| 1930 | 61 |
| 1931 | 44 |
| 1932 | 75 |
| 1933 | 6 |
| 1934 | 14 |
| 1935 | 20 |
| 1936 | 14 |
| 1937 | 4 |
| 1938 | 10 |
| 1939 | 4 |
| 1940 | 12 |
| 1941 | 10 |
| 1942 | 13 |
| 1943 | 27 |
| 1944 | 24 |
| 1945 | 13 |
| 1946 | 12 |
| 1947 | 16 |
| 1948 | 15 |
| 1949 | 4 |
| 1950 | 8 |
| 1951 | 17 |
| 1952 | 15 |
| 1953 | 27 |
| 1954 | 15 |
| 1955 | 31 |
| 1956 | 93 |
| 1957 | 21 |
| 1958 | 13 |
| 1959 | 25 |
| 1961 | 5 |
| 1962 | 16 |
| 1963 | 13 |
| 1964 | 13 |
| 1965 | 13 |
| 1966 | 30 |
| 1967 | 18 |
| 1968 | 8 |
| 1970 | 13 |
| 1971 | 10 |
| 1972 | 11 |
| 1973 | 11 |
| 1974 | 18 |
| 1975 | 12 |
| 1976 | 20 |
| 1977 | 16 |
| 1978 | 14 |
| 1979 | 24 |
| 1980 | 11 |
| 1981 | 10 |
| 1982 | 6 |
| 1983 | 10 |
| 1984 | 20 |
| 1985 | 48 |
| 1986 | 17 |
| 1987 | 41 |
| 1988 | 13 |
| 1989 | 9 |
All-Time Record Progression
7 new records| Date | Kind | Detail |
|---|---|---|
| 1956-04-07 | Record high minimum temperature | Record high minimum temperature 17.8 C (64.0 F) |
| 1956-04-14 | Record high minimum temperature | Record high minimum temperature 18.3 C (64.9 F) |
| 1956-04-27 | Record high minimum temperature | Record high minimum temperature 20.0 C (68.0 F) |
| 1958-01-07 | Record low maximum temperature | Record low maximum temperature 3.9 C (39.0 F) |
| 1962-06-06 | Record high maximum temperature | Record high maximum temperature 41.7 C (107.1 F) |
| 1967-01-11 | Record low maximum temperature | Record low maximum temperature 1.7 C (35.1 F) |
| 1976-02-24 | Record low minimum temperature | Record low minimum temperature -10.0 C (14.0 F) |
Wettest Day of Each Month
Aug: 97.8 mm (3.9 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 35.1 mm (1.4 in) | 24 January 1980 |
| Feb | 89.9 mm (3.5 in) | 10 February 1970 |
| Mar | 80.8 mm (3.2 in) | 5 March 1968 |
| Apr | 43.9 mm (1.7 in) | 28 April 1977 |
| May | 61.5 mm (2.4 in) | 20 May 1967 |
| Jun | 59.9 mm (2.4 in) | 21 June 1971 |
| Jul | 88.4 mm (3.5 in) | 2 July 1944 |
| Aug | 97.8 mm (3.9 in) | 20 August 1936 |
| Sep | 69.6 mm (2.7 in) | 22 September 1984 |
| Oct | 72.6 mm (2.9 in) | 8 October 1986 |
| Nov | 39.4 mm (1.6 in) | 11 November 1930 |
| Dec | 53.8 mm (2.1 in) | 17 December 1947 |
Period of Record Coverage
1924 to 1989| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1924 | 140 | 38% | No |
| 1925 | 364 | 100% | Yes |
| 1926 | 365 | 100% | Yes |
| 1927 | 365 | 100% | Yes |
| 1928 | 294 | 80% | No |
| 1929 | 337 | 92% | Yes |
| 1930 | 365 | 100% | Yes |
| 1931 | 365 | 100% | Yes |
| 1932 | 365 | 100% | Yes |
| 1933 | 365 | 100% | Yes |
| 1934 | 365 | 100% | Yes |
| 1935 | 365 | 100% | Yes |
| 1936 | 365 | 100% | Yes |
| 1937 | 365 | 100% | Yes |
| 1938 | 365 | 100% | Yes |
| 1939 | 364 | 100% | Yes |
| 1940 | 365 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 364 | 100% | Yes |
| 1943 | 364 | 100% | Yes |
| 1944 | 306 | 84% | No |
| 1945 | 365 | 100% | Yes |
| 1946 | 357 | 98% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 365 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 333 | 91% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 364 | 100% | Yes |
| 1955 | 363 | 99% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 334 | 92% | Yes |
| 1959 | 334 | 92% | Yes |
| 1960 | 61 | 17% | No |
| 1961 | 362 | 99% | Yes |
| 1962 | 334 | 92% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 365 | 100% | Yes |
| 1965 | 363 | 99% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 303 | 83% | No |
| 1968 | 242 | 66% | No |
| 1969 | 30 | 8% | No |
| 1970 | 333 | 91% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 363 | 99% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 365 | 100% | Yes |
| 1977 | 303 | 83% | No |
| 1978 | 363 | 99% | Yes |
| 1979 | 325 | 89% | No |
| 1980 | 365 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 365 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 364 | 99% | Yes |
| 1989 | 365 | 100% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 24 December 1989 | San Juan de Los Llanos, MX | daily low min | -5.0 C (23.0 F) | 1.1 C (2.0 F) | 58 years | 26 of 100 (Routine) |
| 13 October 1989 | San Juan de Los Llanos, MX | daily high min (Tie) | 12.8 C (55.0 F) | tie | 64 years | 6 of 100 (Routine) |
| 28 September 1989 | San Juan de Los Llanos, MX | daily low max | 15.0 C (59.0 F) | 2.8 C (5.0 F) | 36 years | 24 of 100 (Routine) |
| 27 August 1989 | San Juan de Los Llanos, MX | daily rain | 23.6 mm (0.9 in) | 3.8 mm (0.15 in) | 42 years | 20 of 100 (Routine) |
| 21 August 1989 | San Juan de Los Llanos, MX | daily high min | 15.0 C (59.0 F) | 1.1 C (2.0 F) | 64 years | 30 of 100 (Routine) |
| 20 July 1989 | San Juan de Los Llanos, MX | daily high min | 15.0 C (59.0 F) | 0.6 C (1.1 F) | 62 years | 27 of 100 (Routine) |
| 18 July 1989 | San Juan de Los Llanos, MX | daily high min (Tie) | 13.9 C (57.0 F) | tie | 63 years | 6 of 100 (Routine) |
| 13 March 1989 | San Juan de Los Llanos, MX | daily low min | -4.4 C (24.1 F) | 0.5 C (0.9 F) | 55 years | 23 of 100 (Routine) |
| 12 March 1989 | San Juan de Los Llanos, MX | daily low max (Tie) | 18.9 C (66.0 F) | tie | 32 years | 3 of 100 (Routine) |
| 10 March 1989 | San Juan de Los Llanos, MX | daily low min | -4.4 C (24.1 F) | 2.7 C (4.9 F) | 47 years | 29 of 100 (Routine) |
| 8 March 1989 | San Juan de Los Llanos, MX | daily low min (Tie) | -3.3 C (26.1 F) | tie | 19 years | 2 of 100 (Routine) |
| 7 March 1989 | San Juan de Los Llanos, MX | daily low min | -4.4 C (24.1 F) | 0.5 C (0.9 F) | 18 years | 12 of 100 (Routine) |
| 24 February 1989 | San Juan de Los Llanos, MX | daily low max | 16.7 C (62.1 F) | 3.3 C (5.9 F) | 21 years | 21 of 100 (Routine) |
| 10 February 1989 | San Juan de Los Llanos, MX | daily low max | 15.0 C (59.0 F) | 1.7 C (3.1 F) | 19 years | 16 of 100 (Routine) |
| 8 February 1989 | San Juan de Los Llanos, MX | daily rain | 2.0 mm (0.08 in) | 2.0 mm (0.08 in) | 64 years | 20 of 100 (Routine) |
| 5 January 1989 | San Juan de Los Llanos, MX | daily high max (Tie) | 26.7 C (80.1 F) | tie | 64 years | 6 of 100 (Routine) |
| 25 November 1988 | San Juan de Los Llanos, MX | daily high min | 10.6 C (51.1 F) | 0.6 C (1.1 F) | 41 years | 19 of 100 (Routine) |
| 12 September 1988 | San Juan de Los Llanos, MX | daily low min (Tie) | 5.6 C (42.1 F) | tie | 3 years | 1 of 100 (Routine) |
| 28 August 1988 | San Juan de Los Llanos, MX | daily low min (Tie) | 5.0 C (41.0 F) | tie | 3 years | 1 of 100 (Routine) |
| 26 August 1988 | San Juan de Los Llanos, MX | daily low min (Tie) | 5.6 C (42.1 F) | tie | 3 years | 1 of 100 (Routine) |
Climate Trend
50 complete years, 1925 to 1989| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1925 | 18.7 C | +2.72 C |
| 1926 | 18.4 C | +2.45 C |
| 1927 | 18.7 C | +2.70 C |
| 1930 | 18.1 C | +2.14 C |
| 1931 | 17.2 C | +1.22 C |
| 1932 | 16.8 C | +0.81 C |
| 1933 | 16.2 C | +0.17 C |
| 1934 | 15.6 C | -0.38 C |
| 1935 | 15.6 C | -0.40 C |
| 1936 | 16.0 C | +0.05 C |
| 1937 | 16.0 C | +0.04 C |
| 1938 | 15.7 C | -0.33 C |
| 1939 | 16.4 C | +0.40 C |
| 1940 | 15.8 C | -0.24 C |
| 1941 | 16.4 C | +0.45 C |
| 1942 | 15.9 C | -0.06 C |
| 1943 | 15.2 C | -0.81 C |
| 1945 | 17.0 C | +1.02 C |
| 1946 | 16.8 C | +0.85 C |
| 1947 | 16.9 C | +0.95 C |
| 1948 | 16.5 C | +0.49 C |
| 1949 | 16.3 C | +0.35 C |
| 1951 | 16.3 C | +0.31 C |
| 1952 | 15.8 C | -0.17 C |
| 1953 | 15.5 C | -0.46 C |
| 1954 | 15.9 C | -0.06 C |
| 1955 | 16.1 C | +0.15 C |
| 1956 | 15.6 C | -0.44 C |
| 1957 | 16.0 C | +0.00 C |
| 1961 | 15.7 C | -0.31 C |
| 1963 | 16.3 C | +0.28 C |
| 1964 | 16.0 C | -0.04 C |
| 1965 | 15.2 C | -0.79 C |
| 1966 | 14.7 C | -1.32 C |
| 1971 | 15.4 C | -0.56 C |
| 1972 | 16.3 C | +0.31 C |
| 1973 | 15.6 C | -0.35 C |
| 1974 | 15.3 C | -0.72 C |
| 1975 | 15.3 C | -0.72 C |
| 1976 | 14.4 C | -1.61 C |
| 1978 | 15.1 C | -0.87 C |
| 1980 | 15.2 C | -0.76 C |
| 1981 | 15.0 C | -1.04 C |
| 1982 | 15.6 C | -0.44 C |
| 1983 | 15.1 C | -0.85 C |
| 1984 | 14.1 C | -1.92 C |
| 1985 | 14.0 C | -1.97 C |
| 1987 | 15.6 C | -0.37 C |
| 1988 | 16.2 C | +0.23 C |
| 1989 | 15.9 C | -0.11 C |
The annual mean temperature here has fallen by 0.4 C (0.2 to 0.5) per decade over 1925 to 1989. In Fahrenheit: 0.6 F (0.4 to 0.8) 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 | -0.4 C (-0.5 to -0.2) per decade | -0.6 F (-0.8 to -0.4) per decade | 1925 to 1989 | 50 | Fall |
| Mean daily maximum | -0.5 C (-0.7 to -0.3) per decade | -0.9 F (-1.3 to -0.6) per decade | 1925 to 1989 | 50 | Fall |
| Mean daily minimum | -0.18 C (-0.34 to -0.02) per decade | -0.33 F (-0.62 to -0.04) per decade | 1925 to 1989 | 50 | Fall |
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
1924 to 1989| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.7 C (107.1 F) | 1962 | 33.9 C (93.0 F) | 66 |
| Coldest night (TNn) | -10.0 C (14.0 F) | 1976 | -5.0 C (23.0 F) | 66 |
| Wettest day (Rx1day) | 97.8 mm (3.9 in) | 1936 | 42.2 mm (1.7 in) | 66 |
| Wettest five days (Rx5day) | 188.7 mm (7.4 in) | 1971 | 81.9 mm (3.2 in) | 66 |
| Longest dry spell (CDD) | 138 days | 1986 | 68 days | 66 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1924 | 35.6 C (96.1 F) |
| 1925 | 37.8 C (100.0 F) |
| 1926 | 36.7 C (98.1 F) |
| 1927 | 38.3 C (100.9 F) |
| 1928 | 38.3 C (100.9 F) |
| 1929 | 38.3 C (100.9 F) |
| 1930 | 39.4 C (102.9 F) |
| 1931 | 37.8 C (100.0 F) |
| 1932 | 41.1 C (106.0 F) |
| 1933 | 37.2 C (99.0 F) |
| 1934 | 33.9 C (93.0 F) |
| 1935 | 35.0 C (95.0 F) |
| 1936 | 36.7 C (98.1 F) |
| 1937 | 34.4 C (93.9 F) |
| 1938 | 32.8 C (91.0 F) |
| 1939 | 35.0 C (95.0 F) |
| 1940 | 37.2 C (99.0 F) |
| 1941 | 31.1 C (88.0 F) |
| 1942 | 33.3 C (91.9 F) |
| 1943 | 31.1 C (88.0 F) |
| 1944 | 32.8 C (91.0 F) |
| 1945 | 33.3 C (91.9 F) |
| 1946 | 33.9 C (93.0 F) |
| 1947 | 32.8 C (91.0 F) |
| 1948 | 33.9 C (93.0 F) |
| 1949 | 32.8 C (91.0 F) |
| 1950 | 37.2 C (99.0 F) |
| 1951 | 33.3 C (91.9 F) |
| 1952 | 35.0 C (95.0 F) |
| 1953 | 38.3 C (100.9 F) |
| 1954 | 37.8 C (100.0 F) |
| 1955 | 36.7 C (98.1 F) |
| 1956 | 35.0 C (95.0 F) |
| 1957 | 35.0 C (95.0 F) |
| 1958 | 38.9 C (102.0 F) |
| 1959 | 35.0 C (95.0 F) |
| 1960 | 27.8 C (82.0 F) |
| 1961 | 35.6 C (96.1 F) |
| 1962 | 41.7 C (107.1 F) |
| 1963 | 35.0 C (95.0 F) |
| 1964 | 36.7 C (98.1 F) |
| 1965 | 35.0 C (95.0 F) |
| 1966 | 31.7 C (89.1 F) |
| 1967 | 33.9 C (93.0 F) |
| 1968 | 31.7 C (89.1 F) |
| 1969 | 26.1 C (79.0 F) |
| 1970 | 33.9 C (93.0 F) |
| 1971 | 32.8 C (91.0 F) |
| 1972 | 33.3 C (91.9 F) |
| 1973 | 33.9 C (93.0 F) |
| 1974 | 31.1 C (88.0 F) |
| 1975 | 32.2 C (90.0 F) |
| 1976 | 31.7 C (89.1 F) |
| 1977 | 30.0 C (86.0 F) |
| 1978 | 31.1 C (88.0 F) |
| 1979 | 30.0 C (86.0 F) |
| 1980 | 32.8 C (91.0 F) |
| 1981 | 30.0 C (86.0 F) |
| 1982 | 31.7 C (89.1 F) |
| 1983 | 33.9 C (93.0 F) |
| 1984 | 31.7 C (89.1 F) |
| 1985 | 32.2 C (90.0 F) |
| 1986 | 38.9 C (102.0 F) |
| 1987 | 38.9 C (102.0 F) |
| 1988 | 37.8 C (100.0 F) |
| 1989 | 32.8 C (91.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1924 | 0.6 C (33.1 F) |
| 1925 | -3.3 C (26.1 F) |
| 1926 | -4.4 C (24.1 F) |
| 1927 | -3.3 C (26.1 F) |
| 1928 | -5.6 C (21.9 F) |
| 1929 | -4.4 C (24.1 F) |
| 1930 | -6.1 C (21.0 F) |
| 1931 | -4.4 C (24.1 F) |
| 1932 | -5.0 C (23.0 F) |
| 1933 | -6.1 C (21.0 F) |
| 1934 | -6.1 C (21.0 F) |
| 1935 | -8.3 C (17.1 F) |
| 1936 | -5.0 C (23.0 F) |
| 1937 | -3.3 C (26.1 F) |
| 1938 | -7.8 C (18.0 F) |
| 1939 | -2.2 C (28.0 F) |
| 1940 | -5.0 C (23.0 F) |
| 1941 | -2.2 C (28.0 F) |
| 1942 | -6.1 C (21.0 F) |
| 1943 | -5.0 C (23.0 F) |
| 1944 | -5.0 C (23.0 F) |
| 1945 | -3.9 C (25.0 F) |
| 1946 | -5.6 C (21.9 F) |
| 1947 | -5.0 C (23.0 F) |
| 1948 | -2.2 C (28.0 F) |
| 1949 | -4.4 C (24.1 F) |
| 1950 | -2.8 C (27.0 F) |
| 1951 | -5.0 C (23.0 F) |
| 1952 | -5.0 C (23.0 F) |
| 1953 | -5.0 C (23.0 F) |
| 1954 | -1.7 C (28.9 F) |
| 1955 | -8.3 C (17.1 F) |
| 1956 | -6.1 C (21.0 F) |
| 1957 | -2.2 C (28.0 F) |
| 1958 | -4.4 C (24.1 F) |
| 1959 | -4.4 C (24.1 F) |
| 1960 | -0.6 C (30.9 F) |
| 1961 | -6.1 C (21.0 F) |
| 1962 | -5.0 C (23.0 F) |
| 1963 | -5.0 C (23.0 F) |
| 1964 | -2.8 C (27.0 F) |
| 1965 | -5.0 C (23.0 F) |
| 1966 | -8.3 C (17.1 F) |
| 1967 | -7.2 C (19.0 F) |
| 1968 | -5.0 C (23.0 F) |
| 1969 | -5.0 C (23.0 F) |
| 1970 | -7.2 C (19.0 F) |
| 1971 | -5.0 C (23.0 F) |
| 1972 | -6.1 C (21.0 F) |
| 1973 | -7.2 C (19.0 F) |
| 1974 | -7.8 C (18.0 F) |
| 1975 | -6.1 C (21.0 F) |
| 1976 | -10.0 C (14.0 F) |
| 1977 | -4.4 C (24.1 F) |
| 1978 | -2.2 C (28.0 F) |
| 1979 | -4.4 C (24.1 F) |
| 1980 | -4.4 C (24.1 F) |
| 1981 | -3.3 C (26.1 F) |
| 1982 | -3.3 C (26.1 F) |
| 1983 | -3.3 C (26.1 F) |
| 1984 | -3.3 C (26.1 F) |
| 1985 | -1.1 C (30.0 F) |
| 1986 | -4.4 C (24.1 F) |
| 1987 | -7.2 C (19.0 F) |
| 1988 | -3.3 C (26.1 F) |
| 1989 | -5.0 C (23.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1924 | 37.6 mm (1.5 in) |
| 1925 | 41.9 mm (1.6 in) |
| 1926 | 41.4 mm (1.6 in) |
| 1927 | 56.4 mm (2.2 in) |
| 1928 | 42.2 mm (1.7 in) |
| 1929 | 37.1 mm (1.5 in) |
| 1930 | 39.9 mm (1.6 in) |
| 1931 | 33.5 mm (1.3 in) |
| 1932 | 50.8 mm (2.0 in) |
| 1933 | 38.4 mm (1.5 in) |
| 1934 | 64.3 mm (2.5 in) |
| 1935 | 55.4 mm (2.2 in) |
| 1936 | 97.8 mm (3.9 in) |
| 1937 | 37.6 mm (1.5 in) |
| 1938 | 18.0 mm (0.7 in) |
| 1939 | 14.7 mm (0.6 in) |
| 1940 | 19.6 mm (0.8 in) |
| 1941 | 44.2 mm (1.7 in) |
| 1942 | 52.3 mm (2.1 in) |
| 1943 | 47.8 mm (1.9 in) |
| 1944 | 88.4 mm (3.5 in) |
| 1945 | 45.0 mm (1.8 in) |
| 1946 | 54.9 mm (2.2 in) |
| 1947 | 53.8 mm (2.1 in) |
| 1948 | 46.5 mm (1.8 in) |
| 1949 | 17.8 mm (0.7 in) |
| 1950 | 32.3 mm (1.3 in) |
| 1951 | 25.9 mm (1.0 in) |
| 1952 | 41.9 mm (1.6 in) |
| 1953 | 31.8 mm (1.3 in) |
| 1954 | 45.0 mm (1.8 in) |
| 1955 | 46.0 mm (1.8 in) |
| 1956 | 24.9 mm (1.0 in) |
| 1957 | 35.3 mm (1.4 in) |
| 1958 | 49.8 mm (2.0 in) |
| 1959 | 46.0 mm (1.8 in) |
| 1960 | 22.4 mm (0.9 in) |
| 1961 | 39.9 mm (1.6 in) |
| 1962 | 30.0 mm (1.2 in) |
| 1963 | 45.0 mm (1.8 in) |
| 1964 | 35.3 mm (1.4 in) |
| 1965 | 51.8 mm (2.0 in) |
| 1966 | 41.9 mm (1.6 in) |
| 1967 | 69.9 mm (2.8 in) |
| 1968 | 80.8 mm (3.2 in) |
| 1969 | 2.3 mm (0.09 in) |
| 1970 | 89.9 mm (3.5 in) |
| 1971 | 59.9 mm (2.4 in) |
| 1972 | 49.3 mm (1.9 in) |
| 1973 | 74.9 mm (2.9 in) |
| 1974 | 62.5 mm (2.5 in) |
| 1975 | 54.9 mm (2.2 in) |
| 1976 | 47.8 mm (1.9 in) |
| 1977 | 43.9 mm (1.7 in) |
| 1978 | 54.9 mm (2.2 in) |
| 1979 | 36.3 mm (1.4 in) |
| 1980 | 42.2 mm (1.7 in) |
| 1981 | 32.3 mm (1.3 in) |
| 1982 | 33.8 mm (1.3 in) |
| 1983 | 24.1 mm (0.9 in) |
| 1984 | 69.6 mm (2.7 in) |
| 1985 | 28.2 mm (1.1 in) |
| 1986 | 72.6 mm (2.9 in) |
| 1987 | 32.8 mm (1.3 in) |
| 1988 | 27.2 mm (1.1 in) |
| 1989 | 23.6 mm (0.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1924 | 72.4 mm (2.9 in) |
| 1925 | 72.6 mm (2.9 in) |
| 1926 | 95.8 mm (3.8 in) |
| 1927 | 173.5 mm (6.8 in) |
| 1928 | 134.1 mm (5.3 in) |
| 1929 | 66.2 mm (2.6 in) |
| 1930 | 95.6 mm (3.8 in) |
| 1931 | 67.6 mm (2.7 in) |
| 1932 | 66.0 mm (2.6 in) |
| 1933 | 87.2 mm (3.4 in) |
| 1934 | 79.7 mm (3.1 in) |
| 1935 | 117.7 mm (4.6 in) |
| 1936 | 146.9 mm (5.8 in) |
| 1937 | 109.7 mm (4.3 in) |
| 1938 | 58.0 mm (2.3 in) |
| 1939 | 42.7 mm (1.7 in) |
| 1940 | 42.7 mm (1.7 in) |
| 1941 | 100.4 mm (4.0 in) |
| 1942 | 98.6 mm (3.9 in) |
| 1943 | 75.2 mm (3.0 in) |
| 1944 | 127.7 mm (5.0 in) |
| 1945 | 78.8 mm (3.1 in) |
| 1946 | 103.4 mm (4.1 in) |
| 1947 | 70.6 mm (2.8 in) |
| 1948 | 77.5 mm (3.1 in) |
| 1949 | 50.2 mm (2.0 in) |
| 1950 | 74.5 mm (2.9 in) |
| 1951 | 81.2 mm (3.2 in) |
| 1952 | 84.0 mm (3.3 in) |
| 1953 | 63.5 mm (2.5 in) |
| 1954 | 67.8 mm (2.7 in) |
| 1955 | 79.3 mm (3.1 in) |
| 1956 | 64.5 mm (2.5 in) |
| 1957 | 59.9 mm (2.4 in) |
| 1958 | 132.4 mm (5.2 in) |
| 1959 | 116.6 mm (4.6 in) |
| 1960 | 37.9 mm (1.5 in) |
| 1961 | 86.0 mm (3.4 in) |
| 1962 | 66.3 mm (2.6 in) |
| 1963 | 80.8 mm (3.2 in) |
| 1964 | 90.5 mm (3.6 in) |
| 1965 | 82.5 mm (3.2 in) |
| 1966 | 83.9 mm (3.3 in) |
| 1967 | 77.2 mm (3.0 in) |
| 1968 | 161.4 mm (6.4 in) |
| 1969 | 4.1 mm (0.16 in) |
| 1970 | 115.0 mm (4.5 in) |
| 1971 | 188.7 mm (7.4 in) |
| 1972 | 65.6 mm (2.6 in) |
| 1973 | 167.5 mm (6.6 in) |
| 1974 | 118.9 mm (4.7 in) |
| 1975 | 124.5 mm (4.9 in) |
| 1976 | 131.9 mm (5.2 in) |
| 1977 | 109.7 mm (4.3 in) |
| 1978 | 127.8 mm (5.0 in) |
| 1979 | 65.5 mm (2.6 in) |
| 1980 | 94.0 mm (3.7 in) |
| 1981 | 73.0 mm (2.9 in) |
| 1982 | 49.3 mm (1.9 in) |
| 1983 | 69.3 mm (2.7 in) |
| 1984 | 94.8 mm (3.7 in) |
| 1985 | 66.6 mm (2.6 in) |
| 1986 | 140.2 mm (5.5 in) |
| 1987 | 103.1 mm (4.1 in) |
| 1988 | 90.5 mm (3.6 in) |
| 1989 | 50.8 mm (2.0 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1924 | 62 days |
| 1925 | 56 days |
| 1926 | 97 days |
| 1927 | 58 days |
| 1928 | 49 days |
| 1929 | 63 days |
| 1930 | 80 days |
| 1931 | 77 days |
| 1932 | 74 days |
| 1933 | 82 days |
| 1934 | 68 days |
| 1935 | 49 days |
| 1936 | 59 days |
| 1937 | 58 days |
| 1938 | 48 days |
| 1939 | 69 days |
| 1940 | 54 days |
| 1941 | 40 days |
| 1942 | 90 days |
| 1943 | 89 days |
| 1944 | 43 days |
| 1945 | 78 days |
| 1946 | 51 days |
| 1947 | 102 days |
| 1948 | 71 days |
| 1949 | 123 days |
| 1950 | 68 days |
| 1951 | 78 days |
| 1952 | 92 days |
| 1953 | 71 days |
| 1954 | 80 days |
| 1955 | 101 days |
| 1956 | 59 days |
| 1957 | 68 days |
| 1958 | 80 days |
| 1959 | 59 days |
| 1960 | 80 days |
| 1961 | 76 days |
| 1962 | 112 days |
| 1963 | 115 days |
| 1964 | 54 days |
| 1965 | 57 days |
| 1966 | 65 days |
| 1967 | 75 days |
| 1968 | 59 days |
| 1969 | 26 days |
| 1970 | 117 days |
| 1971 | 64 days |
| 1972 | 79 days |
| 1973 | 62 days |
| 1974 | 26 days |
| 1975 | 94 days |
| 1976 | 59 days |
| 1977 | 48 days |
| 1978 | 41 days |
| 1979 | 64 days |
| 1980 | 34 days |
| 1981 | 40 days |
| 1982 | 55 days |
| 1983 | 86 days |
| 1984 | 68 days |
| 1985 | 96 days |
| 1986 | 138 days |
| 1987 | 92 days |
| 1988 | 57 days |
| 1989 | 61 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 Juan de Los Llanos falls on 28 February and the median first autumn frost on 10 November, which leaves a median of 247 days between them.
Fitted over all years, the growing season changes by +0.2 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1940 to 1989) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 28 February | n/a | 28 February | n/a | -0.1 days per decade |
| First autumn frost | 10 November | n/a | 6 November | n/a | +0.1 days per decade |
| Growing days | 247 days | n/a | 250 days | n/a | +0.2 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
59 years, 1925 to 1989A day with at least 41.5 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 91.3 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 | 41.5 mm (1.6 in) | |
| 5 years | 56.4 mm (2.2 in) | |
| 10 years | 65.6 mm (2.6 in) | |
| 25 years | 76.5 mm (3.0 in) | |
| 50 years | 84.1 mm (3.3 in) | |
| 100 years | 91.3 mm (3.6 in) | Longer than the 59 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, 59 years of values from 1925 to 1989.
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: 97.8 mm (3.9 in) in 1936; 89.9 mm (3.5 in) in 1970; 74.9 mm (2.9 in) in 1973.
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).