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San Blas Weather Records (MXN00018029)

Record envelope, standing records and threshold days for San Blas (MXN00018029), Mexico, with 75 years of record.

Key Facts for San Blas

  • San Blas (MXN00018029) is a weather station in Mexico at 21.53 latitude and -105.28 longitude, 4 m (13 ft) above sea level.
  • The station reports from 1938 to 2012, 75 years of record.
  • 1,464 records set at San Blas still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • San Blas tied a daily record low minimum temperature of 21.7 C (71.1 F) on 5 September 2012.

About the Station

  • Location: Mexico, 21.53 latitude, -105.28 longitude.
  • Elevation: 4 m (13 ft).
  • Period of record: 1938 to 2012, 75 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 Blas, with 2026 drawn through them The band shows the record high and record low for each calendar day at San Blas. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 01020304050 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at San Blas. 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 Blas, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan36.7 C (98.1 F)0.6 C (33.1 F)n/an/a
Feb38.3 C (100.9 F)7.8 C (46.0 F)n/an/a
Mar39.4 C (102.9 F)7.8 C (46.0 F)n/an/a
Apr40.6 C (105.1 F)10.0 C (50.0 F)n/an/a
May40.0 C (104.0 F)10.0 C (50.0 F)n/an/a
Jun38.9 C (102.0 F)10.6 C (51.1 F)n/an/a
Jul41.1 C (106.0 F)16.7 C (62.1 F)n/an/a
Aug38.9 C (102.0 F)16.7 C (62.1 F)n/an/a
Sep40.0 C (104.0 F)20.0 C (68.0 F)n/an/a
Oct41.7 C (107.1 F)12.8 C (55.0 F)n/an/a
Nov40.0 C (104.0 F)8.9 C (48.0 F)n/an/a
Dec36.7 C (98.1 F)6.7 C (44.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at San Blas by the year they were set 1,464 records at San Blas still stand. 1947 holds the most, with 213. 01002003001938: 161939: 131940: 231941: 331942: 291943: 511944: 581945: 281946: 131947: 2131948: 861954: 121955: 201956: 321957: 51960: 211961: 121962: 261963: 191964: 91965: 91966: 121967: 51968: 201969: 181970: 81971: 161972: 181973: 241974: 71975: 91976: 101977: 141978: 81979: 131980: 141981: 111982: 301983: 331984: 371985: 101986: 161987: 51988: 31989: 41990: 141991: 131992: 131993: 81994: 71995: 71996: 191997: 161998: 121999: 32000: 832001: 412002: 602003: 192004: 42005: 112006: 132007: 92008: 62009: 162010: 52011: 72012: 51938194519571966197319801987199420012008
1,464 records at San Blas still stand. 1947 holds the most, with 213.
Standing records at San Blas by the year they were set
Year setStanding records
193816
193913
194023
194133
194229
194351
194458
194528
194613
1947213
194886
195412
195520
195632
19575
196021
196112
196226
196319
19649
19659
196612
19675
196820
196918
19708
197116
197218
197324
19747
19759
197610
197714
19788
197913
198014
198111
198230
198333
198437
198510
198616
19875
19883
19894
199014
199113
199213
19938
19947
19957
199619
199716
199812
19993
200083
200141
200260
200319
20044
200511
200613
20079
20086
200916
20105
20117
20125

All-Time Record Progression

3 new records
When San Blas set new all-time records 3 all-time records were set at San Blas between 6 July 1980 and 7 October 2002. Each dot is a new record. Record high maximum temperature6 July 1980: Record high maximum temperature 40.0 C (104.0 F)29 July 1996: Record high maximum temperature 41.1 C (106.0 F)7 October 2002: Record high maximum temperature 41.7 C (107.1 F)19801985199019952000
3 all-time records were set at San Blas between 6 July 1980 and 7 October 2002. Each dot is a new record.
When San Blas set new all-time records
DateKindDetail
1980-07-06Record high maximum temperatureRecord high maximum temperature 40.0 C (104.0 F)
1996-07-29Record high maximum temperatureRecord high maximum temperature 41.1 C (106.0 F)
2002-10-07Record high maximum temperatureRecord high maximum temperature 41.7 C (107.1 F)

Wettest Day of Each Month

Aug: 241.8 mm (9.5 in)
Record daily precipitation for each month at San Blas The wettest day on record for each calendar month at San Blas. The most was 241.8 mm (9.5 in) on 25 August 1969. 0100200300 Jan: 89.9 mm (3.5 in), 12 January 1987 Jan Feb: 114.8 mm (4.5 in), 4 February 2005 Feb Mar: 53.8 mm (2.1 in), 3 March 1968 Mar Apr: 9.4 mm (0.37 in), 1 April 1966 Apr May: 52.8 mm (2.1 in), 2 May 1981 May Jun: 164.8 mm (6.5 in), 25 June 1999 Jun Jul: 190.0 mm (7.5 in), 27 July 1998 Jul Aug: 241.8 mm (9.5 in), 25 August 1969 Aug Sep: 229.9 mm (9.1 in), 1 September 1971 Sep Oct: 236.0 mm (9.3 in), 9 October 1943 Oct Nov: 70.9 mm (2.8 in), 25 November 1982 Nov Dec: 89.9 mm (3.5 in), 13 December 1992 Dec
The wettest day on record for each calendar month at San Blas. The most was 241.8 mm (9.5 in) on 25 August 1969.
Record daily precipitation for each month at San Blas
MonthRecord daily precipitation (mm)Date
Jan89.9 mm (3.5 in)12 January 1987
Feb114.8 mm (4.5 in)4 February 2005
Mar53.8 mm (2.1 in)3 March 1968
Apr9.4 mm (0.37 in)1 April 1966
May52.8 mm (2.1 in)2 May 1981
Jun164.8 mm (6.5 in)25 June 1999
Jul190.0 mm (7.5 in)27 July 1998
Aug241.8 mm (9.5 in)25 August 1969
Sep229.9 mm (9.1 in)1 September 1971
Oct236.0 mm (9.3 in)9 October 1943
Nov70.9 mm (2.8 in)25 November 1982
Dec89.9 mm (3.5 in)13 December 1992

Period of Record Coverage

1938 to 2012
Days with data per year at San Blas 68 years of record at San Blas, 1938 to 2012. 14 years have data for under 90 percent of days and are left out of rankings: 1938, 1939, 1948, 1954, 1955, 1957, 1960, 1961 and others. 1938: 206 of 365 days1939: 214 of 365 days1940: 365 of 366 days1941: 365 of 365 days1942: 365 of 365 days1943: 365 of 365 days1944: 366 of 366 days1945: 365 of 365 days1946: 365 of 365 days1947: 365 of 365 days1948: 182 of 366 days1954: 184 of 365 days1955: 89 of 365 days1956: 365 of 366 days1957: 211 of 365 days1960: 211 of 366 days1961: 306 of 365 days1962: 365 of 365 days1963: 365 of 365 days1964: 366 of 366 days1965: 365 of 365 days1966: 364 of 365 days1967: 365 of 365 days1968: 365 of 366 days1969: 362 of 365 days1970: 333 of 365 days1971: 365 of 365 days1972: 366 of 366 days1973: 365 of 365 days1974: 365 of 365 days1975: 365 of 365 days1976: 363 of 366 days1977: 365 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 363 of 366 days1981: 364 of 365 days1982: 363 of 365 days1983: 364 of 365 days1984: 366 of 366 days1985: 334 of 365 days1986: 365 of 365 days1987: 59 of 365 days1988: 59 of 366 days1989: 365 of 365 days1990: 365 of 365 days1991: 365 of 365 days1992: 365 of 366 days1993: 333 of 365 days1994: 334 of 365 days1995: 335 of 365 days1996: 365 of 366 days1997: 305 of 365 days1998: 365 of 365 days1999: 304 of 365 days2000: 242 of 366 days2001: 365 of 365 days2002: 340 of 365 days2003: 365 of 365 days2004: 355 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 334 of 365 days2008: 334 of 366 days2009: 365 of 365 days2010: 365 of 365 days2011: 365 of 365 days2012: 273 of 366 days1940196019701980199020002010
68 years of record at San Blas, 1938 to 2012. 14 years have data for under 90 percent of days and are left out of rankings: 1938, 1939, 1948, 1954, 1955, 1957, 1960, 1961 and others.
Days with data per year at San Blas
YearDays with dataShare of yearComplete
193820656%No
193921459%No
1940365100%Yes
1941365100%Yes
1942365100%Yes
1943365100%Yes
1944366100%Yes
1945365100%Yes
1946365100%Yes
1947365100%Yes
194818250%No
195418450%No
19558924%No
1956365100%Yes
195721158%No
196021158%No
196130684%No
1962365100%Yes
1963365100%Yes
1964366100%Yes
1965365100%Yes
1966364100%Yes
1967365100%Yes
1968365100%Yes
196936299%Yes
197033391%Yes
1971365100%Yes
1972366100%Yes
1973365100%Yes
1974365100%Yes
1975365100%Yes
197636399%Yes
1977365100%Yes
1978365100%Yes
1979365100%Yes
198036399%Yes
1981364100%Yes
198236399%Yes
1983364100%Yes
1984366100%Yes
198533492%Yes
1986365100%Yes
19875916%No
19885916%No
1989365100%Yes
1990365100%Yes
1991365100%Yes
1992365100%Yes
199333391%Yes
199433492%Yes
199533592%Yes
1996365100%Yes
199730584%No
1998365100%Yes
199930483%No
200024266%No
2001365100%Yes
200234093%Yes
2003365100%Yes
200435597%Yes
2005365100%Yes
2006365100%Yes
200733492%Yes
200833491%Yes
2009365100%Yes
2010365100%Yes
2011365100%Yes
201227375%No

Latest Records

20
Latest records at San Blas
DateStationRecordValueBeat old record byOld record stoodSignificance
5 September 2012San Blas, MXdaily low min (Tie)21.7 C (71.1 F)tie68 years6 of 100 (Routine)
4 September 2012San Blas, MXdaily low min (Tie)22.8 C (73.0 F)tie71 years7 of 100 (Routine)
19 August 2012San Blas, MXdaily low max27.8 C (82.0 F)2.8 C (5.0 F)2 years21 of 100 (Routine)
14 August 2012San Blas, MXdaily low min (Tie)21.7 C (71.1 F)tie69 years6 of 100 (Routine)
11 August 2012San Blas, MXdaily high min27.8 C (82.0 F)1.1 C (2.0 F)5 years16 of 100 (Routine)
10 August 2012San Blas, MXdaily high min (Tie)26.7 C (80.1 F)tie37 years4 of 100 (Routine)
28 July 2012San Blas, MXdaily high max (Tie)37.8 C (100.0 F)tie18 years3 of 100 (Routine)
20 June 2012San Blas, MXdaily rain87.9 mm (3.5 in)4.1 mm (0.16 in)38 years19 of 100 (Routine)
18 June 2012San Blas, MXdaily high max (Tie)37.8 C (100.0 F)tie10 years2 of 100 (Routine)
16 June 2012San Blas, MXdaily high max37.8 C (100.0 F)1.1 C (2.0 F)11 years14 of 100 (Routine)
4 May 2012San Blas, MXdaily high min (Tie)23.9 C (75.0 F)tie22 years3 of 100 (Routine)
24 April 2012San Blas, MXdaily low max23.9 C (75.0 F)1.7 C (3.1 F)67 years34 of 100 (Routine)
2 March 2012San Blas, MXdaily low max23.9 C (75.0 F)1.1 C (2.0 F)33 years20 of 100 (Routine)
15 February 2012San Blas, MXdaily rain3.8 mm (0.15 in)3.8 mm (0.15 in)72 years20 of 100 (Routine)
15 February 2012San Blas, MXdaily high min (Tie)20.0 C (68.0 F)tie45 years5 of 100 (Routine)
11 February 2012San Blas, MXdaily low max (Tie)22.8 C (73.0 F)tie45 years5 of 100 (Routine)
30 November 2011San Blas, MXdaily low min (Tie)13.9 C (57.0 F)tie64 years6 of 100 (Routine)
28 November 2011San Blas, MXdaily high max (Tie)33.9 C (93.0 F)tie64 years6 of 100 (Routine)
22 October 2011San Blas, MXdaily high min (Tie)25.6 C (78.1 F)tie4 years2 of 100 (Routine)
21 October 2011San Blas, MXdaily high min (Tie)25.6 C (78.1 F)tie2 years1 of 100 (Routine)

Climate Trend

43 complete years, 1940 to 2011
Annual mean temperature at San Blas as warming stripes, 1940 to 2011 One stripe for each of 43 complete years at San Blas, 1940 to 2011. Blue stripes are years cooler than the station's own mean of 25.6 C (78.1 F); red stripes are warmer. The coolest year was 1943, at 24.0 C (75.3 F), and the warmest was 1992, at 26.7 C (80.0 F). The strongest colour marks a difference of 1.6 C (2.9 F). 1940: 25.8 C, +0.2 C from the station mean1941: 26.4 C, +0.8 C from the station mean1942: 25.3 C, -0.3 C from the station mean1943: 24.0 C, -1.6 C from the station mean1944: 24.2 C, -1.4 C from the station mean1945: 24.5 C, -1.1 C from the station mean1946: 25.1 C, -0.6 C from the station mean1962: 25.6 C, -0.1 C from the station mean1963: 25.7 C, +0.1 C from the station mean1964: 24.8 C, -0.8 C from the station mean1965: 25.4 C, -0.2 C from the station mean1966: 25.9 C, +0.2 C from the station mean1967: 25.4 C, -0.3 C from the station mean1968: 25.6 C, 0.0 C from the station mean1969: 25.8 C, +0.2 C from the station mean1971: 25.1 C, -0.5 C from the station mean1972: 26.2 C, +0.6 C from the station mean1973: 25.5 C, -0.1 C from the station mean1974: 25.0 C, -0.6 C from the station mean1975: 24.9 C, -0.7 C from the station mean1976: 25.4 C, -0.2 C from the station mean1977: 25.7 C, +0.1 C from the station mean1978: 25.7 C, +0.1 C from the station mean1979: 25.0 C, -0.6 C from the station mean1980: 25.9 C, +0.3 C from the station mean1981: 26.0 C, +0.4 C from the station mean1982: 26.6 C, +1.0 C from the station mean1983: 26.2 C, +0.5 C from the station mean1984: 26.5 C, +0.9 C from the station mean1986: 25.7 C, +0.1 C from the station mean1989: 25.9 C, +0.2 C from the station mean1990: 26.6 C, +1.0 C from the station mean1991: 26.2 C, +0.6 C from the station mean1992: 26.7 C, +1.0 C from the station mean1996: 26.3 C, +0.7 C from the station mean1998: 26.2 C, +0.5 C from the station mean2001: 26.0 C, +0.4 C from the station mean2003: 26.1 C, +0.5 C from the station mean2005: 25.7 C, +0.1 C from the station mean2006: 26.1 C, +0.5 C from the station mean2009: 25.9 C, +0.3 C from the station mean2010: 24.9 C, -0.7 C from the station mean2011: 24.5 C, -1.1 C from the station mean19401950196019701980199020002010
One stripe for each of 43 complete years at San Blas, 1940 to 2011. Blue stripes are years cooler than the station's own mean of 25.6 C (78.1 F); red stripes are warmer. The coolest year was 1943, at 24.0 C (75.3 F), and the warmest was 1992, at 26.7 C (80.0 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at San Blas as warming stripes, 1940 to 2011
YearAnnual mean temperatureDifference from the station mean
194025.8 C+0.16 C
194126.4 C+0.79 C
194225.3 C-0.34 C
194324.0 C-1.59 C
194424.2 C-1.42 C
194524.5 C-1.09 C
194625.1 C-0.56 C
196225.6 C-0.08 C
196325.7 C+0.09 C
196424.8 C-0.83 C
196525.4 C-0.24 C
196625.9 C+0.25 C
196725.4 C-0.26 C
196825.6 C+0.01 C
196925.8 C+0.16 C
197125.1 C-0.51 C
197226.2 C+0.60 C
197325.5 C-0.12 C
197425.0 C-0.61 C
197524.9 C-0.72 C
197625.4 C-0.23 C
197725.7 C+0.10 C
197825.7 C+0.07 C
197925.0 C-0.60 C
198025.9 C+0.29 C
198126.0 C+0.37 C
198226.6 C+0.96 C
198326.2 C+0.52 C
198426.5 C+0.91 C
198625.7 C+0.08 C
198925.9 C+0.23 C
199026.6 C+0.96 C
199126.2 C+0.61 C
199226.7 C+1.05 C
199626.3 C+0.69 C
199826.2 C+0.54 C
200126.0 C+0.39 C
200326.1 C+0.48 C
200525.7 C+0.08 C
200626.1 C+0.50 C
200925.9 C+0.27 C
201024.9 C-0.72 C
201124.5 C-1.09 C

The annual mean temperature here has risen by 0.12 C (0.03 to 0.22) per decade over 1940 to 2011. In Fahrenheit: 0.2 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 43 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at San Blas
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.12 C (0.03 to 0.22) per decade0.2 F (0.1 to 0.4) per decade1940 to 201143Rise
Mean daily maximum0.09 C (-0.05 to 0.22) per decade0.2 F (-0.1 to 0.4) per decade1940 to 201143Not clearly different from zero
Mean daily minimum0.2 C (0.1 to 0.3) per decade0.3 F (0.1 to 0.5) per decade1940 to 201143Rise

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

1938 to 2012
Yearly extremes at San Blas: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)41.7 C (107.1 F)200237.8 C (100.0 F)68
Coldest night (TNn)0.6 C (33.1 F)195510.6 C (51.1 F)68
Wettest day (Rx1day)241.8 mm (9.5 in)1969112.8 mm (4.4 in)68
Wettest five days (Rx5day)383.1 mm (15.1 in)1979202.9 mm (8.0 in)68
Longest dry spell (CDD)180 days1982125 days68

Hottest day (TXx)

Hottest day (TXx) at San Blas by year The hottest day of the year at San Blas, 1938 to 2012. The record is 41.7 C (107.1 F) in 2002, marked on the chart; the median year is 37.8 C (100.0 F). 3032.53537.54042.51940196019802000Record: 41.7 C (107.1 F) in 2002
The hottest day of the year at San Blas, 1938 to 2012. The record is 41.7 C (107.1 F) in 2002, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at San Blas by year
YearHottest day (TXx)
193837.8 C (100.0 F)
193936.7 C (98.1 F)
194037.8 C (100.0 F)
194138.3 C (100.9 F)
194236.7 C (98.1 F)
194335.0 C (95.0 F)
194435.6 C (96.1 F)
194536.7 C (98.1 F)
194637.8 C (100.0 F)
194735.6 C (96.1 F)
194831.7 C (89.1 F)
195438.9 C (102.0 F)
195533.9 C (93.0 F)
195638.9 C (102.0 F)
195735.6 C (96.1 F)
196037.8 C (100.0 F)
196139.4 C (102.9 F)
196238.9 C (102.0 F)
196338.9 C (102.0 F)
196435.0 C (95.0 F)
196537.8 C (100.0 F)
196637.8 C (100.0 F)
196735.6 C (96.1 F)
196838.9 C (102.0 F)
196936.7 C (98.1 F)
197038.3 C (100.9 F)
197137.2 C (99.0 F)
197237.2 C (99.0 F)
197337.2 C (99.0 F)
197436.1 C (97.0 F)
197535.6 C (96.1 F)
197637.8 C (100.0 F)
197737.8 C (100.0 F)
197837.8 C (100.0 F)
197936.7 C (98.1 F)
198040.0 C (104.0 F)
198137.2 C (99.0 F)
198239.4 C (102.9 F)
198338.9 C (102.0 F)
198437.2 C (99.0 F)
198537.8 C (100.0 F)
198636.7 C (98.1 F)
198733.9 C (93.0 F)
198832.8 C (91.0 F)
198937.2 C (99.0 F)
199037.8 C (100.0 F)
199138.3 C (100.9 F)
199237.8 C (100.0 F)
199338.9 C (102.0 F)
199438.3 C (100.9 F)
199538.3 C (100.9 F)
199641.1 C (106.0 F)
199738.3 C (100.9 F)
199838.9 C (102.0 F)
199939.4 C (102.9 F)
200040.6 C (105.1 F)
200138.9 C (102.0 F)
200241.7 C (107.1 F)
200337.8 C (100.0 F)
200437.8 C (100.0 F)
200540.0 C (104.0 F)
200638.9 C (102.0 F)
200737.8 C (100.0 F)
200837.8 C (100.0 F)
200935.0 C (95.0 F)
201037.8 C (100.0 F)
201135.6 C (96.1 F)
201237.8 C (100.0 F)

Coldest night (TNn)

Coldest night (TNn) at San Blas by year The coldest night of the year at San Blas, 1938 to 2012. The record is 0.6 C (33.1 F) in 1955, marked on the chart; the median year is 10.6 C (51.1 F). 0510151940196019802000Record: 0.6 C (33.1 F) in 1955
The coldest night of the year at San Blas, 1938 to 2012. The record is 0.6 C (33.1 F) in 1955, marked on the chart; the median year is 10.6 C (51.1 F).
Coldest night (TNn) at San Blas by year
YearColdest night (TNn)
193813.9 C (57.0 F)
193910.6 C (51.1 F)
19407.8 C (46.0 F)
194111.7 C (53.1 F)
19428.9 C (48.0 F)
19436.1 C (43.0 F)
19448.9 C (48.0 F)
194510.0 C (50.0 F)
19468.9 C (48.0 F)
19477.8 C (46.0 F)
194810.0 C (50.0 F)
195411.7 C (53.1 F)
19550.6 C (33.1 F)
195611.7 C (53.1 F)
19577.8 C (46.0 F)
19605.6 C (42.1 F)
196111.7 C (53.1 F)
19629.4 C (48.9 F)
196310.0 C (50.0 F)
196410.0 C (50.0 F)
196510.6 C (51.1 F)
196610.0 C (50.0 F)
19678.9 C (48.0 F)
196810.6 C (51.1 F)
19698.3 C (46.9 F)
197011.1 C (52.0 F)
19719.4 C (48.9 F)
197210.0 C (50.0 F)
197310.6 C (51.1 F)
197410.6 C (51.1 F)
197510.6 C (51.1 F)
197611.1 C (52.0 F)
197712.2 C (54.0 F)
197812.2 C (54.0 F)
19799.4 C (48.9 F)
198011.1 C (52.0 F)
198113.3 C (55.9 F)
198212.8 C (55.0 F)
198312.2 C (54.0 F)
198413.9 C (57.0 F)
198512.8 C (55.0 F)
198611.1 C (52.0 F)
198710.0 C (50.0 F)
198811.7 C (53.1 F)
198911.1 C (52.0 F)
199010.6 C (51.1 F)
199110.6 C (51.1 F)
199212.8 C (55.0 F)
199310.6 C (51.1 F)
199412.8 C (55.0 F)
199513.3 C (55.9 F)
199612.8 C (55.0 F)
19978.9 C (48.0 F)
199812.8 C (55.0 F)
199910.6 C (51.1 F)
20008.9 C (48.0 F)
20016.7 C (44.1 F)
200210.6 C (51.1 F)
200313.9 C (57.0 F)
200411.7 C (53.1 F)
200513.9 C (57.0 F)
200612.8 C (55.0 F)
200715.0 C (59.0 F)
200810.6 C (51.1 F)
200913.9 C (57.0 F)
201012.8 C (55.0 F)
201110.0 C (50.0 F)
201213.9 C (57.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at San Blas by year The wettest day of the year at San Blas, 1938 to 2012. The record is 241.8 mm (9.5 in) in 1969, marked on the chart; the median year is 112.8 mm (4.4 in). 01002003001940196019802000Record: 241.8 mm (9.5 in) in 1969
The wettest day of the year at San Blas, 1938 to 2012. The record is 241.8 mm (9.5 in) in 1969, marked on the chart; the median year is 112.8 mm (4.4 in).
Wettest day (Rx1day) at San Blas by year
YearWettest day (Rx1day)
1938177.8 mm (7.0 in)
193985.9 mm (3.4 in)
1940122.9 mm (4.8 in)
194186.9 mm (3.4 in)
1942136.9 mm (5.4 in)
1943236.0 mm (9.3 in)
1944199.9 mm (7.9 in)
194599.8 mm (3.9 in)
1946220.0 mm (8.7 in)
194725.9 mm (1.0 in)
194811.9 mm (0.5 in)
195497.8 mm (3.9 in)
195514.0 mm (0.6 in)
195669.9 mm (2.8 in)
195785.9 mm (3.4 in)
19609.7 mm (0.38 in)
1961132.3 mm (5.2 in)
1962111.3 mm (4.4 in)
1963168.4 mm (6.6 in)
1964115.8 mm (4.6 in)
1965141.0 mm (5.6 in)
1966159.8 mm (6.3 in)
1967119.9 mm (4.7 in)
196880.3 mm (3.2 in)
1969241.8 mm (9.5 in)
1970113.8 mm (4.5 in)
1971229.9 mm (9.1 in)
1972127.8 mm (5.0 in)
1973111.8 mm (4.4 in)
197497.8 mm (3.9 in)
1975152.9 mm (6.0 in)
1976106.9 mm (4.2 in)
1977142.0 mm (5.6 in)
197880.8 mm (3.2 in)
1979156.0 mm (6.1 in)
1980118.4 mm (4.7 in)
1981111.0 mm (4.4 in)
1982132.8 mm (5.2 in)
1983101.3 mm (4.0 in)
1984103.4 mm (4.1 in)
198563.8 mm (2.5 in)
1986119.9 mm (4.7 in)
198789.9 mm (3.5 in)
19882.8 mm (0.11 in)
1989142.7 mm (5.6 in)
1990119.9 mm (4.7 in)
199166.8 mm (2.6 in)
1992122.9 mm (4.8 in)
199387.4 mm (3.4 in)
1994103.9 mm (4.1 in)
1995109.5 mm (4.3 in)
199675.9 mm (3.0 in)
199788.9 mm (3.5 in)
1998190.0 mm (7.5 in)
1999173.0 mm (6.8 in)
200071.9 mm (2.8 in)
2001164.8 mm (6.5 in)
2002144.8 mm (5.7 in)
200389.9 mm (3.5 in)
200499.8 mm (3.9 in)
2005159.8 mm (6.3 in)
200665.3 mm (2.6 in)
200790.4 mm (3.6 in)
2008128.3 mm (5.1 in)
2009125.0 mm (4.9 in)
2010120.9 mm (4.8 in)
2011136.9 mm (5.4 in)
201296.8 mm (3.8 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at San Blas by year The wettest five days of the year at San Blas, 1938 to 2012. The record is 383.1 mm (15.1 in) in 1979, marked on the chart; the median year is 202.9 mm (8.0 in). 01002003004001940196019802000Record: 383.1 mm (15.1 in) in 1979
The wettest five days of the year at San Blas, 1938 to 2012. The record is 383.1 mm (15.1 in) in 1979, marked on the chart; the median year is 202.9 mm (8.0 in).
Wettest five days (Rx5day) at San Blas by year
YearWettest five days (Rx5day)
1938239.5 mm (9.4 in)
1939142.5 mm (5.6 in)
1940188.7 mm (7.4 in)
1941216.2 mm (8.5 in)
1942241.3 mm (9.5 in)
1943251.5 mm (9.9 in)
1944372.4 mm (14.7 in)
1945143.5 mm (5.6 in)
1946258.9 mm (10.2 in)
194787.4 mm (3.4 in)
194811.9 mm (0.5 in)
1954154.3 mm (6.1 in)
195520.4 mm (0.8 in)
1956175.6 mm (6.9 in)
1957202.3 mm (8.0 in)
196010.2 mm (0.4 in)
1961224.6 mm (8.8 in)
1962216.4 mm (8.5 in)
1963317.0 mm (12.5 in)
1964277.9 mm (10.9 in)
1965200.7 mm (7.9 in)
1966339.9 mm (13.4 in)
1967170.7 mm (6.7 in)
1968138.2 mm (5.4 in)
1969342.0 mm (13.5 in)
1970204.0 mm (8.0 in)
1971362.2 mm (14.3 in)
1972161.6 mm (6.4 in)
1973217.0 mm (8.5 in)
1974266.5 mm (10.5 in)
1975337.6 mm (13.3 in)
1976178.0 mm (7.0 in)
1977291.7 mm (11.5 in)
1978189.2 mm (7.4 in)
1979383.1 mm (15.1 in)
1980206.3 mm (8.1 in)
1981164.6 mm (6.5 in)
1982189.2 mm (7.4 in)
1983162.3 mm (6.4 in)
1984166.4 mm (6.6 in)
1985132.9 mm (5.2 in)
1986204.1 mm (8.0 in)
1987139.9 mm (5.5 in)
19882.8 mm (0.11 in)
1989288.6 mm (11.4 in)
1990136.7 mm (5.4 in)
1991129.3 mm (5.1 in)
1992207.3 mm (8.2 in)
1993165.3 mm (6.5 in)
1994128.8 mm (5.1 in)
1995291.2 mm (11.5 in)
1996239.5 mm (9.4 in)
1997196.6 mm (7.7 in)
1998275.3 mm (10.8 in)
1999294.7 mm (11.6 in)
2000134.7 mm (5.3 in)
2001304.3 mm (12.0 in)
2002210.4 mm (8.3 in)
2003146.6 mm (5.8 in)
2004156.5 mm (6.2 in)
2005198.7 mm (7.8 in)
2006196.3 mm (7.7 in)
2007182.6 mm (7.2 in)
2008203.5 mm (8.0 in)
2009243.6 mm (9.6 in)
2010360.0 mm (14.2 in)
2011257.5 mm (10.1 in)
2012233.2 mm (9.2 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at San Blas by year The longest dry spell of the year at San Blas, 1938 to 2012. The record is 180 days in 1982, marked on the chart; the median year is 125 days. 0501001502001940196019802000Record: 180 days in 1982
The longest dry spell of the year at San Blas, 1938 to 2012. The record is 180 days in 1982, marked on the chart; the median year is 125 days.
Longest dry spell (CDD) at San Blas by year
YearLongest dry spell (CDD)
193835 days
193942 days
1940148 days
194168 days
1942118 days
1943106 days
194487 days
1945135 days
1946150 days
1947162 days
1948158 days
195469 days
195545 days
1956150 days
1957141 days
1960117 days
1961105 days
1962137 days
1963102 days
196490 days
1965150 days
196662 days
1967154 days
1968105 days
1969166 days
197098 days
1971145 days
1972154 days
1973121 days
1974146 days
1975154 days
1976161 days
1977109 days
197868 days
1979128 days
198062 days
198142 days
1982180 days
198382 days
1984118 days
1985134 days
1986114 days
198720 days
198829 days
1989171 days
199080 days
1991175 days
199296 days
1993143 days
1994175 days
1995170 days
1996153 days
199745 days
1998129 days
1999168 days
2000151 days
200194 days
2002109 days
2003172 days
200499 days
2005105 days
2006175 days
2007141 days
2008159 days
2009138 days
201092 days
2011170 days
2012118 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.

Rainfall Return Levels

54 years, 1940 to 2011

A day with at least 118.3 mm (4.7 in) of rain is expected about once in 2 years. A day with at least 260.8 mm (10.3 in) of rain is expected about once in 100 years.

Rainfall return levels at San Blas: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years118.3 mm (4.7 in)
5 years158.0 mm (6.2 in)
10 years183.7 mm (7.2 in)
25 years215.4 mm (8.5 in)
50 years238.4 mm (9.4 in)
100 years260.8 mm (10.3 in)Longer than the 54 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, 54 years of values from 1940 to 2011.

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: 241.8 mm (9.5 in) in 1969; 236.0 mm (9.3 in) in 1943; 229.9 mm (9.1 in) in 1971.

Download the Data

  • Data for San Blas standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for San Blas 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-15).