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San Telmo Weather Records (MXN00002055)

Record envelope, standing records and threshold days for San Telmo (MXN00002055), Mexico, with 65 years of record.

Key Facts for San Telmo

  • San Telmo (MXN00002055) is a weather station in Mexico at 30.95 latitude and -116.10 longitude, 60 m (196 ft) above sea level.
  • The station reports from 1948 to 2012, 65 years of record.
  • 1,464 records set at San Telmo still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • San Telmo set a daily record high maximum temperature of 30.6 C (87.1 F) on 24 November 2012.

About the Station

  • Location: Mexico, 30.95 latitude, -116.10 longitude.
  • Elevation: 60 m (196 ft).
  • Period of record: 1948 to 2012, 65 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at San Telmo, with 2026 drawn through them The band shows the record high and record low for each calendar day at San Telmo. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at San Telmo. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at San Telmo, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan35.0 C (95.0 F)-7.2 C (19.0 F)n/an/a
Feb35.6 C (96.1 F)-6.1 C (21.0 F)n/an/a
Mar35.6 C (96.1 F)-5.0 C (23.0 F)n/an/a
Apr35.0 C (95.0 F)-1.7 C (28.9 F)n/an/a
May40.0 C (104.0 F)0.6 C (33.1 F)n/an/a
Jun43.3 C (109.9 F)2.8 C (37.0 F)n/an/a
Jul43.9 C (111.0 F)6.1 C (43.0 F)n/an/a
Aug40.6 C (105.1 F)5.0 C (41.0 F)n/an/a
Sep47.8 C (118.0 F)1.7 C (35.1 F)n/an/a
Oct40.0 C (104.0 F)-3.3 C (26.1 F)n/an/a
Nov36.7 C (98.1 F)-6.1 C (21.0 F)n/an/a
Dec32.8 C (91.0 F)-7.8 C (18.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at San Telmo by the year they were set 1,464 records at San Telmo still stand. 1953 holds the most, with 69. 0204060801948: 231949: 591950: 481951: 211952: 621953: 691954: 351955: 531956: 431957: 421958: 461959: 481960: 471961: 231962: 321963: 251964: 301965: 401966: 241967: 291968: 271969: 231970: 331971: 431972: 291973: 261974: 361975: 211976: 311977: 281978: 371979: 421980: 271981: 391982: 321983: 351984: 511985: 191986: 191988: 21990: 272011: 112012: 27194819531958196319681973197819831990
1,464 records at San Telmo still stand. 1953 holds the most, with 69.
Standing records at San Telmo by the year they were set
Year setStanding records
194823
194959
195048
195121
195262
195369
195435
195553
195643
195742
195846
195948
196047
196123
196232
196325
196430
196540
196624
196729
196827
196923
197033
197143
197229
197326
197436
197521
197631
197728
197837
197942
198027
198139
198232
198335
198451
198519
198619
19882
199027
201111
201227

Wettest Day of Each Month

Sep: 82.8 mm (3.3 in)
Record daily precipitation for each month at San Telmo The wettest day on record for each calendar month at San Telmo. The most was 82.8 mm (3.3 in) on 17 September 1963. 0255075100 Jan: 67.8 mm (2.7 in), 16 January 1979 Jan Feb: 71.9 mm (2.8 in), 28 February 1978 Feb Mar: 37.8 mm (1.5 in), 10 March 1986 Mar Apr: 39.9 mm (1.6 in), 2 April 1965 Apr May: 6.9 mm (0.27 in), 8 May 1977 May Jun: 4.8 mm (0.19 in), 8 June 1972 Jun Jul: 51.8 mm (2.0 in), 17 July 1984 Jul Aug: 23.4 mm (0.9 in), 16 August 1977 Aug Sep: 82.8 mm (3.3 in), 17 September 1963 Sep Oct: 20.8 mm (0.8 in), 9 October 1985 Oct Nov: 34.8 mm (1.4 in), 30 November 1982 Nov Dec: 79.8 mm (3.1 in), 27 December 1984 Dec
The wettest day on record for each calendar month at San Telmo. The most was 82.8 mm (3.3 in) on 17 September 1963.
Record daily precipitation for each month at San Telmo
MonthRecord daily precipitation (mm)Date
Jan67.8 mm (2.7 in)16 January 1979
Feb71.9 mm (2.8 in)28 February 1978
Mar37.8 mm (1.5 in)10 March 1986
Apr39.9 mm (1.6 in)2 April 1965
May6.9 mm (0.27 in)8 May 1977
Jun4.8 mm (0.19 in)8 June 1972
Jul51.8 mm (2.0 in)17 July 1984
Aug23.4 mm (0.9 in)16 August 1977
Sep82.8 mm (3.3 in)17 September 1963
Oct20.8 mm (0.8 in)9 October 1985
Nov34.8 mm (1.4 in)30 November 1982
Dec79.8 mm (3.1 in)27 December 1984

Period of Record Coverage

1948 to 2012
Days with data per year at San Telmo 43 years of record at San Telmo, 1948 to 2012. 11 years have data for under 90 percent of days and are left out of rankings: 1948, 1964, 1969, 1982, 1983, 1985, 1986, 1988 and others. 1948: 224 of 366 days1949: 365 of 365 days1950: 365 of 365 days1951: 364 of 365 days1952: 365 of 366 days1953: 365 of 365 days1954: 365 of 365 days1955: 364 of 365 days1956: 365 of 366 days1957: 364 of 365 days1958: 364 of 365 days1959: 364 of 365 days1960: 365 of 366 days1961: 360 of 365 days1962: 365 of 365 days1963: 365 of 365 days1964: 327 of 366 days1965: 351 of 365 days1966: 341 of 365 days1967: 340 of 365 days1968: 345 of 366 days1969: 304 of 365 days1970: 354 of 365 days1971: 355 of 365 days1972: 361 of 366 days1973: 365 of 365 days1974: 354 of 365 days1975: 365 of 365 days1976: 333 of 366 days1977: 364 of 365 days1978: 342 of 365 days1979: 357 of 365 days1980: 341 of 366 days1981: 365 of 365 days1982: 325 of 365 days1983: 318 of 365 days1984: 340 of 366 days1985: 301 of 365 days1986: 238 of 365 days1988: 7 of 366 days1990: 90 of 365 days2011: 148 of 365 days2012: 322 of 366 days19501960197019801990
43 years of record at San Telmo, 1948 to 2012. 11 years have data for under 90 percent of days and are left out of rankings: 1948, 1964, 1969, 1982, 1983, 1985, 1986, 1988 and others.
Days with data per year at San Telmo
YearDays with dataShare of yearComplete
194822461%No
1949365100%Yes
1950365100%Yes
1951364100%Yes
1952365100%Yes
1953365100%Yes
1954365100%Yes
1955364100%Yes
1956365100%Yes
1957364100%Yes
1958364100%Yes
1959364100%Yes
1960365100%Yes
196136099%Yes
1962365100%Yes
1963365100%Yes
196432789%No
196535196%Yes
196634193%Yes
196734093%Yes
196834594%Yes
196930483%No
197035497%Yes
197135597%Yes
197236199%Yes
1973365100%Yes
197435497%Yes
1975365100%Yes
197633391%Yes
1977364100%Yes
197834294%Yes
197935798%Yes
198034193%Yes
1981365100%Yes
198232589%No
198331887%No
198434093%Yes
198530182%No
198623865%No
198872%No
19909025%No
201114841%No
201232288%No

Latest Records

20
Latest records at San Telmo
DateStationRecordValueBeat old record byOld record stoodSignificance
24 November 2012San Telmo, MXdaily high max30.6 C (87.1 F)1.2 C (2.2 F)55 years24 of 100 (Routine)
10 November 2012San Telmo, MXdaily high min (Tie)13.9 C (57.0 F)tie59 years5 of 100 (Routine)
9 November 2012San Telmo, MXdaily high min15.0 C (59.0 F)3.3 C (5.9 F)45 years27 of 100 (Routine)
8 November 2012San Telmo, MXdaily rain4.8 mm (0.19 in)2.0 mm (0.08 in)30 years17 of 100 (Routine)
22 October 2012San Telmo, MXdaily high min (Tie)16.7 C (62.1 F)tie56 years5 of 100 (Routine)
20 October 2012San Telmo, MXdaily high min16.7 C (62.1 F)1.7 C (3.1 F)54 years26 of 100 (Routine)
20 October 2012San Telmo, MXdaily high max35.6 C (96.1 F)1.7 C (3.1 F)29 years18 of 100 (Routine)
19 October 2012San Telmo, MXdaily high max (Tie)35.6 C (96.1 F)tie45 years4 of 100 (Routine)
18 October 2012San Telmo, MXdaily high min17.8 C (64.0 F)2.8 C (5.0 F)40 years25 of 100 (Routine)
9 October 2012San Telmo, MXdaily high min17.8 C (64.0 F)0.6 C (1.1 F)35 years17 of 100 (Routine)
4 October 2012San Telmo, MXdaily high max35.6 C (96.1 F)1.7 C (3.1 F)54 years26 of 100 (Routine)
3 October 2012San Telmo, MXdaily high max37.8 C (100.0 F)1.1 C (2.0 F)47 years22 of 100 (Routine)
2 October 2012San Telmo, MXdaily high max37.8 C (100.0 F)0.6 C (1.1 F)47 years21 of 100 (Routine)
1 October 2012San Telmo, MXdaily high max36.7 C (98.1 F)1.7 C (3.1 F)29 years18 of 100 (Routine)
25 September 2012San Telmo, MXdaily low max20.0 C (68.0 F)1.1 C (2.0 F)38 years19 of 100 (Routine)
19 September 2012San Telmo, MXdaily high min (Tie)18.9 C (66.0 F)tie28 years3 of 100 (Routine)
15 September 2012San Telmo, MXdaily high min (Tie)20.0 C (68.0 F)tie53 years5 of 100 (Routine)
14 September 2012San Telmo, MXdaily high min (Tie)20.0 C (68.0 F)tie28 years3 of 100 (Routine)
13 September 2012San Telmo, MXdaily high min (Tie)20.6 C (69.1 F)tie29 years3 of 100 (Routine)
8 September 2012San Telmo, MXdaily rain5.8 mm (0.23 in)0.5 mm (0.02 in)36 years16 of 100 (Routine)

Climate Trend

32 complete years, 1949 to 1985
Annual mean temperature at San Telmo as warming stripes, 1949 to 1985 One stripe for each of 32 complete years at San Telmo, 1949 to 1985. Blue stripes are years cooler than the station's own mean of 16.2 C (61.2 F); red stripes are warmer. The coolest year was 1952, at 15.1 C (59.1 F), and the warmest was 1984, at 17.8 C (64.1 F). The strongest colour marks a difference of 1.6 C (2.9 F). 1949: 15.8 C, -0.4 C from the station mean1950: 16.2 C, 0.0 C from the station mean1951: 15.7 C, -0.5 C from the station mean1952: 15.1 C, -1.2 C from the station mean1953: 16.2 C, 0.0 C from the station mean1954: 16.1 C, -0.1 C from the station mean1955: 15.1 C, -1.1 C from the station mean1956: 15.6 C, -0.6 C from the station mean1957: 16.2 C, 0.0 C from the station mean1958: 17.1 C, +0.8 C from the station mean1959: 17.3 C, +1.1 C from the station mean1960: 16.3 C, +0.1 C from the station mean1961: 16.0 C, -0.2 C from the station mean1962: 15.5 C, -0.7 C from the station mean1963: 16.5 C, +0.3 C from the station mean1965: 15.7 C, -0.5 C from the station mean1966: 16.2 C, -0.1 C from the station mean1967: 16.2 C, 0.0 C from the station mean1968: 16.1 C, -0.1 C from the station mean1970: 15.8 C, -0.5 C from the station mean1971: 15.2 C, -1.0 C from the station mean1972: 16.1 C, -0.1 C from the station mean1973: 15.7 C, -0.5 C from the station mean1974: 15.6 C, -0.7 C from the station mean1975: 15.2 C, -1.0 C from the station mean1977: 17.1 C, +0.9 C from the station mean1979: 16.9 C, +0.6 C from the station mean1980: 17.4 C, +1.1 C from the station mean1981: 17.8 C, +1.5 C from the station mean1982: 16.6 C, +0.4 C from the station mean1984: 17.8 C, +1.6 C from the station mean1985: 17.1 C, +0.9 C from the station mean19491955196019651970197519801985
One stripe for each of 32 complete years at San Telmo, 1949 to 1985. Blue stripes are years cooler than the station's own mean of 16.2 C (61.2 F); red stripes are warmer. The coolest year was 1952, at 15.1 C (59.1 F), and the warmest was 1984, at 17.8 C (64.1 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at San Telmo as warming stripes, 1949 to 1985
YearAnnual mean temperatureDifference from the station mean
194915.8 C-0.41 C
195016.2 C+0.00 C
195115.7 C-0.54 C
195215.1 C-1.16 C
195316.2 C+0.01 C
195416.1 C-0.13 C
195515.1 C-1.12 C
195615.6 C-0.61 C
195716.2 C+0.00 C
195817.1 C+0.83 C
195917.3 C+1.09 C
196016.3 C+0.05 C
196116.0 C-0.19 C
196215.5 C-0.70 C
196316.5 C+0.25 C
196515.7 C-0.54 C
196616.2 C-0.08 C
196716.2 C-0.03 C
196816.1 C-0.11 C
197015.8 C-0.47 C
197115.2 C-1.00 C
197216.1 C-0.10 C
197315.7 C-0.50 C
197415.6 C-0.66 C
197515.2 C-1.05 C
197717.1 C+0.89 C
197916.9 C+0.64 C
198017.4 C+1.13 C
198117.8 C+1.52 C
198216.6 C+0.40 C
198417.8 C+1.59 C
198517.1 C+0.88 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.6) per decade over 1949 to 1985. In Fahrenheit: 0.6 F (0.2 to 1.0) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at San Telmo
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.3 C (0.1 to 0.6) per decade0.6 F (0.2 to 1.0) per decade1949 to 198532Rise
Mean daily maximum0.5 C (0.2 to 0.8) per decade0.9 F (0.3 to 1.4) per decade1949 to 198532Rise
Mean daily minimum0.2 C (-0.1 to 0.4) per decade0.3 F (-0.1 to 0.7) per decade1949 to 198532Not 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

1948 to 2012
Yearly extremes at San Telmo: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)47.8 C (118.0 F)195837.8 C (100.0 F)43
Coldest night (TNn)-7.8 C (18.0 F)1954-4.4 C (24.1 F)43
Wettest day (Rx1day)82.8 mm (3.3 in)196324.9 mm (1.0 in)43
Wettest five days (Rx5day)129.0 mm (5.1 in)197840.7 mm (1.6 in)43
Longest dry spell (CDD)268 days1962104 days43

Hottest day (TXx)

Hottest day (TXx) at San Telmo by year The hottest day of the year at San Telmo, 1948 to 2012. The record is 47.8 C (118.0 F) in 1958, marked on the chart; the median year is 37.8 C (100.0 F). 253035404550196019802000Record: 47.8 C (118.0 F) in 1958
The hottest day of the year at San Telmo, 1948 to 2012. The record is 47.8 C (118.0 F) in 1958, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at San Telmo by year
YearHottest day (TXx)
194837.8 C (100.0 F)
194936.7 C (98.1 F)
195040.0 C (104.0 F)
195137.8 C (100.0 F)
195236.7 C (98.1 F)
195340.0 C (104.0 F)
195436.7 C (98.1 F)
195540.0 C (104.0 F)
195638.9 C (102.0 F)
195735.0 C (95.0 F)
195847.8 C (118.0 F)
195937.8 C (100.0 F)
196037.2 C (99.0 F)
196137.2 C (99.0 F)
196235.6 C (96.1 F)
196341.1 C (106.0 F)
196435.6 C (96.1 F)
196537.2 C (99.0 F)
196635.6 C (96.1 F)
196740.0 C (104.0 F)
196839.4 C (102.9 F)
196935.0 C (95.0 F)
197038.9 C (102.0 F)
197138.3 C (100.9 F)
197240.0 C (104.0 F)
197340.0 C (104.0 F)
197437.8 C (100.0 F)
197537.8 C (100.0 F)
197637.2 C (99.0 F)
197740.0 C (104.0 F)
197843.3 C (109.9 F)
197941.7 C (107.1 F)
198039.4 C (102.9 F)
198140.6 C (105.1 F)
198237.8 C (100.0 F)
198340.0 C (104.0 F)
198440.0 C (104.0 F)
198543.9 C (111.0 F)
198635.6 C (96.1 F)
198830.6 C (87.1 F)
199028.9 C (84.0 F)
201138.9 C (102.0 F)
201237.8 C (100.0 F)

Coldest night (TNn)

Coldest night (TNn) at San Telmo by year The coldest night of the year at San Telmo, 1948 to 2012. The record is -7.8 C (18.0 F) in 1954, marked on the chart; the median year is -4.4 C (24.1 F). -10-50510196019802000Record: -7.8 C (18.0 F) in 1954
The coldest night of the year at San Telmo, 1948 to 2012. The record is -7.8 C (18.0 F) in 1954, marked on the chart; the median year is -4.4 C (24.1 F).
Coldest night (TNn) at San Telmo by year
YearColdest night (TNn)
1948-5.0 C (23.0 F)
1949-5.0 C (23.0 F)
1950-5.0 C (23.0 F)
1951-5.0 C (23.0 F)
1952-1.1 C (30.0 F)
1953-5.0 C (23.0 F)
1954-7.8 C (18.0 F)
1955-5.0 C (23.0 F)
1956-5.0 C (23.0 F)
1957-5.0 C (23.0 F)
1958-6.1 C (21.0 F)
1959-5.0 C (23.0 F)
1960-6.1 C (21.0 F)
1961-5.0 C (23.0 F)
1962-4.4 C (24.1 F)
1963-3.3 C (26.1 F)
1964-5.0 C (23.0 F)
1965-2.2 C (28.0 F)
1966-5.6 C (21.9 F)
1967-3.9 C (25.0 F)
1968-4.4 C (24.1 F)
1969-5.0 C (23.0 F)
1970-7.2 C (19.0 F)
1971-5.6 C (21.9 F)
1972-5.0 C (23.0 F)
1973-2.2 C (28.0 F)
1974-6.1 C (21.0 F)
1975-4.4 C (24.1 F)
1976-1.1 C (30.0 F)
1977-2.2 C (28.0 F)
1978-2.2 C (28.0 F)
1979-6.1 C (21.0 F)
1980-2.2 C (28.0 F)
1981-3.3 C (26.1 F)
19820.0 C (32.0 F)
19830.0 C (32.0 F)
1984-1.1 C (30.0 F)
1985-3.3 C (26.1 F)
1986-1.1 C (30.0 F)
19887.8 C (46.0 F)
19900.0 C (32.0 F)
20110.0 C (32.0 F)
20120.0 C (32.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at San Telmo by year The wettest day of the year at San Telmo, 1948 to 2012. The record is 82.8 mm (3.3 in) in 1963, marked on the chart; the median year is 24.9 mm (1.0 in). 0255075100196019802000Record: 82.8 mm (3.3 in) in 1963
The wettest day of the year at San Telmo, 1948 to 2012. The record is 82.8 mm (3.3 in) in 1963, marked on the chart; the median year is 24.9 mm (1.0 in).
Wettest day (Rx1day) at San Telmo by year
YearWettest day (Rx1day)
194817.3 mm (0.7 in)
194952.8 mm (2.1 in)
195012.2 mm (0.5 in)
195126.4 mm (1.0 in)
195229.0 mm (1.1 in)
195318.3 mm (0.7 in)
195430.5 mm (1.2 in)
195515.7 mm (0.6 in)
19567.6 mm (0.30 in)
195725.7 mm (1.0 in)
195820.3 mm (0.8 in)
195921.3 mm (0.8 in)
196025.4 mm (1.0 in)
196116.3 mm (0.6 in)
196232.8 mm (1.3 in)
196382.8 mm (3.3 in)
196427.9 mm (1.1 in)
196539.9 mm (1.6 in)
196622.1 mm (0.9 in)
196724.9 mm (1.0 in)
196820.8 mm (0.8 in)
196922.9 mm (0.9 in)
197023.9 mm (0.9 in)
197116.3 mm (0.6 in)
197224.4 mm (1.0 in)
197316.8 mm (0.7 in)
197425.9 mm (1.0 in)
197519.8 mm (0.8 in)
197645.0 mm (1.8 in)
197754.9 mm (2.2 in)
197871.9 mm (2.8 in)
197967.8 mm (2.7 in)
198052.3 mm (2.1 in)
198122.9 mm (0.9 in)
198234.8 mm (1.4 in)
198334.3 mm (1.4 in)
198479.8 mm (3.1 in)
198521.3 mm (0.8 in)
198637.8 mm (1.5 in)
19880.0 mm (0.00 in)
199015.7 mm (0.6 in)
201127.9 mm (1.1 in)
201217.8 mm (0.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at San Telmo by year The wettest five days of the year at San Telmo, 1948 to 2012. The record is 129.0 mm (5.1 in) in 1978, marked on the chart; the median year is 40.7 mm (1.6 in). 050100150196019802000Record: 129.0 mm (5.1 in) in 1978
The wettest five days of the year at San Telmo, 1948 to 2012. The record is 129.0 mm (5.1 in) in 1978, marked on the chart; the median year is 40.7 mm (1.6 in).
Wettest five days (Rx5day) at San Telmo by year
YearWettest five days (Rx5day)
194822.7 mm (0.9 in)
194982.4 mm (3.2 in)
195014.0 mm (0.6 in)
195140.7 mm (1.6 in)
195239.0 mm (1.5 in)
195326.0 mm (1.0 in)
195456.1 mm (2.2 in)
195540.9 mm (1.6 in)
195610.9 mm (0.4 in)
195752.1 mm (2.1 in)
195823.9 mm (0.9 in)
195951.1 mm (2.0 in)
196045.2 mm (1.8 in)
196135.1 mm (1.4 in)
196232.8 mm (1.3 in)
196387.6 mm (3.4 in)
196434.4 mm (1.4 in)
196583.4 mm (3.3 in)
196633.5 mm (1.3 in)
196735.6 mm (1.4 in)
196825.6 mm (1.0 in)
196940.7 mm (1.6 in)
197041.7 mm (1.6 in)
197134.8 mm (1.4 in)
197247.0 mm (1.9 in)
197336.1 mm (1.4 in)
197441.5 mm (1.6 in)
197539.2 mm (1.5 in)
1976100.1 mm (3.9 in)
197793.2 mm (3.7 in)
1978129.0 mm (5.1 in)
197985.4 mm (3.4 in)
198091.6 mm (3.6 in)
198171.4 mm (2.8 in)
198245.4 mm (1.8 in)
198361.0 mm (2.4 in)
1984104.5 mm (4.1 in)
198523.1 mm (0.9 in)
198646.5 mm (1.8 in)
19880.0 mm (0.00 in)
199015.7 mm (0.6 in)
201139.5 mm (1.6 in)
201220.9 mm (0.8 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at San Telmo by year The longest dry spell of the year at San Telmo, 1948 to 2012. The record is 268 days in 1962, marked on the chart; the median year is 104 days. 0100200300196019802000Record: 268 days in 1962
The longest dry spell of the year at San Telmo, 1948 to 2012. The record is 268 days in 1962, marked on the chart; the median year is 104 days.
Longest dry spell (CDD) at San Telmo by year
YearLongest dry spell (CDD)
1948214 days
1949195 days
1950104 days
1951101 days
1952195 days
1953126 days
1954159 days
1955244 days
1956157 days
195798 days
1958126 days
1959159 days
196089 days
196195 days
1962268 days
1963130 days
196475 days
196566 days
196690 days
1967104 days
196894 days
1969159 days
1970202 days
197187 days
1972139 days
1973188 days
197498 days
1975184 days
1976114 days
197793 days
1978118 days
1979130 days
198078 days
1981167 days
198240 days
198393 days
198479 days
198529 days
198655 days
198831 days
199029 days
201165 days
2012135 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

30 years with a frost

Across 30 years with a frost, the median last spring frost at San Telmo falls on 18 March and the median first autumn frost on 21 November, which leaves a median of 247 days between them.

Fitted over all years, the growing season changes by +5.1 days per decade at this station.

Frost dates and growing season at San Telmo
MeasureMedian, all yearsEarliest periodRecent period (1949 to 1985)Recent against earliestFitted trend
Last spring frost18 Marchn/a18 Marchn/a-6.2 days per decade
First autumn frost21 Novembern/a21 Novembern/a-1.1 days per decade
Growing days247 daysn/a247 daysn/a+5.1 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

36 years, 1949 to 2012

A day with at least 26.6 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 116.4 mm (4.6 in) of rain is expected about once in 100 years.

Rainfall return levels at San Telmo: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years26.6 mm (1.0 in)
5 years42.0 mm (1.7 in)
10 years54.9 mm (2.2 in)
25 years75.4 mm (3.0 in)
50 years94.1 mm (3.7 in)Longer than the 36 years of record
100 years116.4 mm (4.6 in)Longer than the 36 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, 36 years of values from 1949 to 2012.

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: 82.8 mm (3.3 in) in 1963; 79.8 mm (3.1 in) in 1984; 71.9 mm (2.8 in) in 1978.

Download the Data

  • Data for San Telmo standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for San Telmo threshold days by year: CSV or JSON. Field meanings are on the data page.

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).