Built 2026-10-19 (19 October 2026)

Copalillo Weather Records (MXN00012023)

Record envelope, standing records and threshold days for Copalillo (MXN00012023), Mexico, with 51 years of record.

Key Facts for Copalillo

  • Copalillo (MXN00012023) is a weather station in Mexico at 18.03 latitude and -99.03 longitude, 900 m (2,952 ft) above sea level.
  • The station reports from 1963 to 2013, 51 years of record.
  • 1,464 records set at Copalillo still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Copalillo set a daily record low minimum temperature of 18.3 C (64.9 F) on 8 May 2013.

About the Station

  • Location: Mexico, 18.03 latitude, -99.03 longitude.
  • Elevation: 900 m (2,952 ft).
  • Period of record: 1963 to 2013, 51 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 Copalillo, with 2026 drawn through them The band shows the record high and record low for each calendar day at Copalillo. 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 Copalillo. 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 Copalillo, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan40.0 C (104.0 F)8.9 C (48.0 F)n/an/a
Feb41.1 C (106.0 F)10.0 C (50.0 F)n/an/a
Mar45.0 C (113.0 F)11.7 C (53.1 F)n/an/a
Apr45.0 C (113.0 F)11.7 C (53.1 F)n/an/a
May46.1 C (115.0 F)13.9 C (57.0 F)n/an/a
Jun45.0 C (113.0 F)13.3 C (55.9 F)n/an/a
Jul41.1 C (106.0 F)12.2 C (54.0 F)n/an/a
Aug41.1 C (106.0 F)13.9 C (57.0 F)n/an/a
Sep40.0 C (104.0 F)10.6 C (51.1 F)n/an/a
Oct42.2 C (108.0 F)10.0 C (50.0 F)n/an/a
Nov40.6 C (105.1 F)8.9 C (48.0 F)n/an/a
Dec40.0 C (104.0 F)9.4 C (48.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Copalillo by the year they were set 1,464 records at Copalillo still stand. 1994 holds the most, with 138. 0501001501964: 21965: 11966: 191967: 161968: 141969: 81970: 91971: 41972: 81973: 151974: 171975: 171976: 101977: 541978: 731979: 111980: 341981: 81982: 31983: 111984: 51986: 481987: 641988: 321989: 161990: 391991: 101992: 121993: 911994: 1381995: 441996: 361997: 61998: 222000: 22001: 32002: 32003: 12004: 32005: 42006: 462007: 572008: 1292009: 912010: 1282011: 532012: 402013: 71964196919741979198419901995200120062011
1,464 records at Copalillo still stand. 1994 holds the most, with 138.
Standing records at Copalillo by the year they were set
Year setStanding records
19642
19651
196619
196716
196814
19698
19709
19714
19728
197315
197417
197517
197610
197754
197873
197911
198034
19818
19823
198311
19845
198648
198764
198832
198916
199039
199110
199212
199391
1994138
199544
199636
19976
199822
20002
20013
20023
20031
20043
20054
200646
200757
2008129
200991
2010128
201153
201240
20137

All-Time Record Progression

2 new records
When Copalillo set new all-time records 2 all-time records were set at Copalillo between 30 May 2000 and 2 November 2004. Each dot is a new record. Record daily precipitation30 May 2000: Record daily precipitation 90.2 mm (3.6 in)2 November 2004: Record daily precipitation 120.7 mm (4.8 in)20002005
2 all-time records were set at Copalillo between 30 May 2000 and 2 November 2004. Each dot is a new record.
When Copalillo set new all-time records
DateKindDetail
2000-05-30Record daily precipitationRecord daily precipitation 90.2 mm (3.6 in)
2004-11-02Record daily precipitationRecord daily precipitation 120.7 mm (4.8 in)

Wettest Day of Each Month

Nov: 120.7 mm (4.8 in)
Record daily precipitation for each month at Copalillo The wettest day on record for each calendar month at Copalillo. The most was 120.7 mm (4.8 in) on 2 November 2004. 050100150 Jan: 39.4 mm (1.6 in), 10 January 1967 Jan Feb: 35.6 mm (1.4 in), 21 February 2009 Feb Mar: 39.4 mm (1.6 in), 14 March 1966 Mar Apr: 39.9 mm (1.6 in), 1 April 1971 Apr May: 90.2 mm (3.6 in), 30 May 2000 May Jun: 66.8 mm (2.6 in), 15 June 1985 Jun Jul: 62.0 mm (2.4 in), 6 July 1971 Jul Aug: 89.2 mm (3.5 in), 13 August 1969 Aug Sep: 65.3 mm (2.6 in), 6 September 1982 Sep Oct: 48.8 mm (1.9 in), 4 October 1964 Oct Nov: 120.7 mm (4.8 in), 2 November 2004 Nov Dec: 24.9 mm (1.0 in), 25 December 1995 Dec
The wettest day on record for each calendar month at Copalillo. The most was 120.7 mm (4.8 in) on 2 November 2004.
Record daily precipitation for each month at Copalillo
MonthRecord daily precipitation (mm)Date
Jan39.4 mm (1.6 in)10 January 1967
Feb35.6 mm (1.4 in)21 February 2009
Mar39.4 mm (1.6 in)14 March 1966
Apr39.9 mm (1.6 in)1 April 1971
May90.2 mm (3.6 in)30 May 2000
Jun66.8 mm (2.6 in)15 June 1985
Jul62.0 mm (2.4 in)6 July 1971
Aug89.2 mm (3.5 in)13 August 1969
Sep65.3 mm (2.6 in)6 September 1982
Oct48.8 mm (1.9 in)4 October 1964
Nov120.7 mm (4.8 in)2 November 2004
Dec24.9 mm (1.0 in)25 December 1995

Period of Record Coverage

1963 to 2013
Days with data per year at Copalillo 51 years of record at Copalillo, 1963 to 2013. 12 years have data for under 90 percent of days and are left out of rankings: 1963, 1979, 1980, 1984, 1985, 1992, 1993, 1996 and others. 1963: 8 of 365 days1964: 366 of 366 days1965: 352 of 365 days1966: 365 of 365 days1967: 365 of 365 days1968: 341 of 366 days1969: 364 of 365 days1970: 364 of 365 days1971: 350 of 365 days1972: 366 of 366 days1973: 365 of 365 days1974: 340 of 365 days1975: 354 of 365 days1976: 365 of 366 days1977: 364 of 365 days1978: 365 of 365 days1979: 90 of 365 days1980: 328 of 366 days1981: 365 of 365 days1982: 365 of 365 days1983: 365 of 365 days1984: 231 of 366 days1985: 265 of 365 days1986: 365 of 365 days1987: 365 of 365 days1988: 335 of 366 days1989: 353 of 365 days1990: 365 of 365 days1991: 365 of 365 days1992: 305 of 366 days1993: 304 of 365 days1994: 365 of 365 days1995: 335 of 365 days1996: 305 of 366 days1997: 365 of 365 days1998: 335 of 365 days1999: 59 of 365 days2000: 46 of 366 days2001: 365 of 365 days2002: 361 of 365 days2003: 365 of 365 days2004: 366 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 303 of 365 days2010: 364 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 151 of 365 days19701980199020002010
51 years of record at Copalillo, 1963 to 2013. 12 years have data for under 90 percent of days and are left out of rankings: 1963, 1979, 1980, 1984, 1985, 1992, 1993, 1996 and others.
Days with data per year at Copalillo
YearDays with dataShare of yearComplete
196382%No
1964366100%Yes
196535296%Yes
1966365100%Yes
1967365100%Yes
196834193%Yes
1969364100%Yes
1970364100%Yes
197135096%Yes
1972366100%Yes
1973365100%Yes
197434093%Yes
197535497%Yes
1976365100%Yes
1977364100%Yes
1978365100%Yes
19799025%No
198032890%No
1981365100%Yes
1982365100%Yes
1983365100%Yes
198423163%No
198526573%No
1986365100%Yes
1987365100%Yes
198833592%Yes
198935397%Yes
1990365100%Yes
1991365100%Yes
199230583%No
199330483%No
1994365100%Yes
199533592%Yes
199630583%No
1997365100%Yes
199833592%Yes
19995916%No
20004613%No
2001365100%Yes
200236199%Yes
2003365100%Yes
2004366100%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
2008366100%Yes
200930383%No
2010364100%Yes
2011365100%Yes
2012366100%Yes
201315141%No

Latest Records

20
Latest records at Copalillo
DateStationRecordValueBeat old record byOld record stoodSignificance
8 May 2013Copalillo, MXdaily low min18.3 C (64.9 F)0.6 C (1.1 F)44 years20 of 100 (Routine)
6 May 2013Copalillo, MXdaily low min17.2 C (63.0 F)0.6 C (1.1 F)47 years21 of 100 (Routine)
1 May 2013Copalillo, MXdaily low min (Tie)16.1 C (61.0 F)tie36 years3 of 100 (Routine)
27 April 2013Copalillo, MXdaily low min16.7 C (62.1 F)0.5 C (0.9 F)0 years7 of 100 (Routine)
25 April 2013Copalillo, MXdaily low min (Tie)16.1 C (61.0 F)tie0 years1 of 100 (Routine)
28 March 2013Copalillo, MXdaily low min (Tie)17.2 C (63.0 F)tie3 years1 of 100 (Routine)
26 March 2013Copalillo, MXdaily low min16.1 C (61.0 F)0.6 C (1.1 F)36 years17 of 100 (Routine)
19 March 2013Copalillo, MXdaily low min (Tie)14.4 C (57.9 F)tie35 years3 of 100 (Routine)
6 March 2013Copalillo, MXdaily low min13.3 C (55.9 F)0.6 C (1.1 F)44 years20 of 100 (Routine)
5 March 2013Copalillo, MXdaily low min13.3 C (55.9 F)1.1 C (2.0 F)3 years10 of 100 (Routine)
4 March 2013Copalillo, MXdaily low min12.2 C (54.0 F)1.7 C (3.1 F)47 years27 of 100 (Routine)
16 February 2013Copalillo, MXdaily low min (Tie)12.8 C (55.0 F)tie43 years4 of 100 (Routine)
30 December 2012Copalillo, MXdaily low min11.7 C (53.1 F)0.5 C (0.9 F)2 years7 of 100 (Routine)
29 December 2012Copalillo, MXdaily low min (Tie)11.1 C (52.0 F)tie2 years1 of 100 (Routine)
13 November 2012Copalillo, MXdaily low min12.8 C (55.0 F)0.5 C (0.9 F)2 years7 of 100 (Routine)
10 November 2012Copalillo, MXdaily low min (Tie)12.2 C (54.0 F)tie3 years1 of 100 (Routine)
18 October 2012Copalillo, MXdaily low min (Tie)15.0 C (59.0 F)tie2 years1 of 100 (Routine)
13 October 2012Copalillo, MXdaily low min (Tie)14.4 C (57.9 F)tie1 year1 of 100 (Routine)
7 October 2012Copalillo, MXdaily low min (Tie)15.0 C (59.0 F)tie2 years1 of 100 (Routine)
6 October 2012Copalillo, MXdaily low min (Tie)14.4 C (57.9 F)tie2 years1 of 100 (Routine)

Climate Trend

32 complete years, 1964 to 2012
Annual mean temperature at Copalillo as warming stripes, 1964 to 2012 One stripe for each of 32 complete years at Copalillo, 1964 to 2012. Blue stripes are years cooler than the station's own mean of 25.4 C (77.7 F); red stripes are warmer. The coolest year was 2008, at 22.1 C (71.7 F), and the warmest was 1994, at 28.6 C (83.5 F). The strongest colour marks a difference of 3.4 C (6.1 F). 1964: 25.2 C, -0.2 C from the station mean1966: 25.0 C, -0.4 C from the station mean1967: 24.9 C, -0.6 C from the station mean1969: 25.6 C, +0.1 C from the station mean1970: 24.8 C, -0.6 C from the station mean1971: 25.2 C, -0.2 C from the station mean1972: 25.6 C, +0.2 C from the station mean1973: 25.7 C, +0.3 C from the station mean1975: 24.7 C, -0.7 C from the station mean1976: 25.2 C, -0.2 C from the station mean1977: 27.0 C, +1.6 C from the station mean1978: 26.6 C, +1.2 C from the station mean1981: 25.3 C, -0.1 C from the station mean1982: 26.1 C, +0.6 C from the station mean1983: 25.7 C, +0.3 C from the station mean1986: 27.6 C, +2.2 C from the station mean1987: 28.0 C, +2.6 C from the station mean1990: 28.1 C, +2.7 C from the station mean1991: 27.7 C, +2.3 C from the station mean1994: 28.6 C, +3.2 C from the station mean1997: 27.0 C, +1.6 C from the station mean2001: 25.4 C, 0.0 C from the station mean2002: 25.8 C, +0.3 C from the station mean2003: 26.0 C, +0.6 C from the station mean2004: 25.0 C, -0.4 C from the station mean2005: 24.9 C, -0.5 C from the station mean2006: 23.4 C, -2.1 C from the station mean2007: 23.2 C, -2.2 C from the station mean2008: 22.1 C, -3.3 C from the station mean2010: 22.2 C, -3.2 C from the station mean2011: 23.2 C, -2.3 C from the station mean2012: 22.7 C, -2.7 C from the station mean1964197019751980198519901995200020052010
One stripe for each of 32 complete years at Copalillo, 1964 to 2012. Blue stripes are years cooler than the station's own mean of 25.4 C (77.7 F); red stripes are warmer. The coolest year was 2008, at 22.1 C (71.7 F), and the warmest was 1994, at 28.6 C (83.5 F). The strongest colour marks a difference of 3.4 C (6.1 F).
Annual mean temperature at Copalillo as warming stripes, 1964 to 2012
YearAnnual mean temperatureDifference from the station mean
196425.2 C-0.25 C
196625.0 C-0.41 C
196724.9 C-0.56 C
196925.6 C+0.14 C
197024.8 C-0.65 C
197125.2 C-0.21 C
197225.6 C+0.20 C
197325.7 C+0.27 C
197524.7 C-0.74 C
197625.2 C-0.23 C
197727.0 C+1.62 C
197826.6 C+1.15 C
198125.3 C-0.11 C
198226.1 C+0.63 C
198325.7 C+0.30 C
198627.6 C+2.22 C
198728.0 C+2.57 C
199028.1 C+2.66 C
199127.7 C+2.30 C
199428.6 C+3.17 C
199727.0 C+1.57 C
200125.4 C-0.01 C
200225.8 C+0.33 C
200326.0 C+0.62 C
200425.0 C-0.44 C
200524.9 C-0.48 C
200623.4 C-2.06 C
200723.2 C-2.23 C
200822.1 C-3.35 C
201022.2 C-3.20 C
201123.2 C-2.26 C
201222.7 C-2.70 C

The annual mean temperature here has fallen by 0.38 C (0.01 to 0.75) per decade over 1964 to 2012. In Fahrenheit: 0.68 F (0.01 to 1.36) 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 Copalillo
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.38 C (-0.75 to 0.00) per decade-0.68 F (-1.36 to -0.01) per decade1964 to 201232Fall
Mean daily maximum-0.6 C (-1.2 to -0.1) per decade-1.1 F (-2.1 to -0.1) per decade1964 to 201232Fall
Mean daily minimum-0.1 C (-0.5 to 0.2) per decade-0.3 F (-0.8 to 0.3) per decade1964 to 201232Not 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

1963 to 2013
Yearly extremes at Copalillo: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)46.1 C (115.0 F)197839.4 C (102.9 F)51
Coldest night (TNn)8.9 C (48.0 F)196712.2 C (54.0 F)51
Wettest day (Rx1day)120.7 mm (4.8 in)200445.0 mm (1.8 in)51
Wettest five days (Rx5day)184.9 mm (7.3 in)197486.9 mm (3.4 in)51
Longest dry spell (CDD)163 days200593 days51

Hottest day (TXx)

Hottest day (TXx) at Copalillo by year The hottest day of the year at Copalillo, 1963 to 2013. The record is 46.1 C (115.0 F) in 1978, marked on the chart; the median year is 39.4 C (102.9 F). 303540455019701980199020002010Record: 46.1 C (115.0 F) in 1978
The hottest day of the year at Copalillo, 1963 to 2013. The record is 46.1 C (115.0 F) in 1978, marked on the chart; the median year is 39.4 C (102.9 F).
Hottest day (TXx) at Copalillo by year
YearHottest day (TXx)
196334.4 C (93.9 F)
196440.0 C (104.0 F)
196537.8 C (100.0 F)
196640.0 C (104.0 F)
196738.9 C (102.0 F)
196840.0 C (104.0 F)
196938.9 C (102.0 F)
197038.9 C (102.0 F)
197137.8 C (100.0 F)
197238.9 C (102.0 F)
197338.9 C (102.0 F)
197437.8 C (100.0 F)
197536.7 C (98.1 F)
197639.4 C (102.9 F)
197745.0 C (113.0 F)
197846.1 C (115.0 F)
197939.4 C (102.9 F)
198043.9 C (111.0 F)
198139.4 C (102.9 F)
198239.4 C (102.9 F)
198340.6 C (105.1 F)
198438.9 C (102.0 F)
198541.1 C (106.0 F)
198641.7 C (107.1 F)
198741.1 C (106.0 F)
198841.7 C (107.1 F)
198941.1 C (106.0 F)
199040.6 C (105.1 F)
199140.6 C (105.1 F)
199240.0 C (104.0 F)
199345.0 C (113.0 F)
199445.0 C (113.0 F)
199540.0 C (104.0 F)
199642.8 C (109.0 F)
199738.9 C (102.0 F)
199843.3 C (109.9 F)
199937.2 C (99.0 F)
200034.4 C (93.9 F)
200139.4 C (102.9 F)
200239.4 C (102.9 F)
200341.7 C (107.1 F)
200438.3 C (100.9 F)
200539.4 C (102.9 F)
200634.4 C (93.9 F)
200739.4 C (102.9 F)
200831.1 C (88.0 F)
200940.0 C (104.0 F)
201038.3 C (100.9 F)
201139.4 C (102.9 F)
201240.0 C (104.0 F)
201339.4 C (102.9 F)

Coldest night (TNn)

Coldest night (TNn) at Copalillo by year The coldest night of the year at Copalillo, 1963 to 2013. The record is 8.9 C (48.0 F) in 1967, marked on the chart; the median year is 12.2 C (54.0 F). 8101214161819701980199020002010Record: 8.9 C (48.0 F) in 1967
The coldest night of the year at Copalillo, 1963 to 2013. The record is 8.9 C (48.0 F) in 1967, marked on the chart; the median year is 12.2 C (54.0 F).
Coldest night (TNn) at Copalillo by year
YearColdest night (TNn)
196312.8 C (55.0 F)
196412.8 C (55.0 F)
196513.9 C (57.0 F)
196611.7 C (53.1 F)
19678.9 C (48.0 F)
196810.0 C (50.0 F)
196911.7 C (53.1 F)
197011.7 C (53.1 F)
197111.7 C (53.1 F)
197212.8 C (55.0 F)
197311.7 C (53.1 F)
197415.0 C (59.0 F)
197511.7 C (53.1 F)
197611.1 C (52.0 F)
197712.8 C (55.0 F)
197811.7 C (53.1 F)
197911.7 C (53.1 F)
198011.1 C (52.0 F)
198111.7 C (53.1 F)
19828.9 C (48.0 F)
198311.7 C (53.1 F)
198412.8 C (55.0 F)
198514.4 C (57.9 F)
198611.7 C (53.1 F)
198713.9 C (57.0 F)
198813.3 C (55.9 F)
198914.4 C (57.9 F)
199016.1 C (61.0 F)
199115.0 C (59.0 F)
199213.3 C (55.9 F)
199315.0 C (59.0 F)
199414.4 C (57.9 F)
199513.3 C (55.9 F)
199612.2 C (54.0 F)
199712.8 C (55.0 F)
199813.3 C (55.9 F)
199915.6 C (60.1 F)
200015.0 C (59.0 F)
200114.4 C (57.9 F)
200210.0 C (50.0 F)
200312.2 C (54.0 F)
200411.1 C (52.0 F)
200513.9 C (57.0 F)
200610.6 C (51.1 F)
200714.4 C (57.9 F)
200813.3 C (55.9 F)
200911.1 C (52.0 F)
20109.4 C (48.9 F)
201110.0 C (50.0 F)
201210.0 C (50.0 F)
201312.2 C (54.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Copalillo by year The wettest day of the year at Copalillo, 1963 to 2013. The record is 120.7 mm (4.8 in) in 2004, marked on the chart; the median year is 45.0 mm (1.8 in). 05010015019701980199020002010Record: 120.7 mm (4.8 in) in 2004
The wettest day of the year at Copalillo, 1963 to 2013. The record is 120.7 mm (4.8 in) in 2004, marked on the chart; the median year is 45.0 mm (1.8 in).
Wettest day (Rx1day) at Copalillo by year
YearWettest day (Rx1day)
19630.0 mm (0.00 in)
196450.3 mm (2.0 in)
196545.0 mm (1.8 in)
196660.2 mm (2.4 in)
196740.9 mm (1.6 in)
196829.5 mm (1.2 in)
196989.2 mm (3.5 in)
197059.9 mm (2.4 in)
197162.0 mm (2.4 in)
197241.9 mm (1.6 in)
197339.9 mm (1.6 in)
197459.9 mm (2.4 in)
197530.0 mm (1.2 in)
197649.8 mm (2.0 in)
197748.8 mm (1.9 in)
197850.8 mm (2.0 in)
197949.8 mm (2.0 in)
198050.3 mm (2.0 in)
198145.0 mm (1.8 in)
198265.3 mm (2.6 in)
198337.8 mm (1.5 in)
198442.9 mm (1.7 in)
198566.8 mm (2.6 in)
198643.4 mm (1.7 in)
198743.4 mm (1.7 in)
198845.5 mm (1.8 in)
198947.5 mm (1.9 in)
199054.4 mm (2.1 in)
199144.5 mm (1.8 in)
199243.4 mm (1.7 in)
199331.8 mm (1.3 in)
199418.3 mm (0.7 in)
199539.9 mm (1.6 in)
199649.8 mm (2.0 in)
199739.9 mm (1.6 in)
199858.7 mm (2.3 in)
199946.5 mm (1.8 in)
200090.2 mm (3.6 in)
200135.3 mm (1.4 in)
200260.5 mm (2.4 in)
200351.8 mm (2.0 in)
2004120.7 mm (4.8 in)
200539.9 mm (1.6 in)
200640.9 mm (1.6 in)
200739.9 mm (1.6 in)
200841.1 mm (1.6 in)
200980.5 mm (3.2 in)
201044.5 mm (1.8 in)
201139.9 mm (1.6 in)
201249.0 mm (1.9 in)
201322.1 mm (0.9 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Copalillo by year The wettest five days of the year at Copalillo, 1963 to 2013. The record is 184.9 mm (7.3 in) in 1974, marked on the chart; the median year is 86.9 mm (3.4 in). 05010015020019701980199020002010Record: 184.9 mm (7.3 in) in 1974
The wettest five days of the year at Copalillo, 1963 to 2013. The record is 184.9 mm (7.3 in) in 1974, marked on the chart; the median year is 86.9 mm (3.4 in).
Wettest five days (Rx5day) at Copalillo by year
YearWettest five days (Rx5day)
19630.0 mm (0.00 in)
196492.0 mm (3.6 in)
1965128.0 mm (5.0 in)
1966129.1 mm (5.1 in)
196781.8 mm (3.2 in)
196841.9 mm (1.6 in)
196995.1 mm (3.7 in)
1970178.5 mm (7.0 in)
197189.6 mm (3.5 in)
197297.5 mm (3.8 in)
197373.7 mm (2.9 in)
1974184.9 mm (7.3 in)
197584.9 mm (3.3 in)
197682.3 mm (3.2 in)
197786.9 mm (3.4 in)
1978125.5 mm (4.9 in)
197977.3 mm (3.0 in)
1980104.2 mm (4.1 in)
198173.2 mm (2.9 in)
198281.3 mm (3.2 in)
198363.8 mm (2.5 in)
1984104.7 mm (4.1 in)
1985101.8 mm (4.0 in)
198663.9 mm (2.5 in)
1987105.1 mm (4.1 in)
198883.8 mm (3.3 in)
198992.0 mm (3.6 in)
199086.9 mm (3.4 in)
1991102.9 mm (4.1 in)
199283.5 mm (3.3 in)
199356.2 mm (2.2 in)
199431.3 mm (1.2 in)
199579.5 mm (3.1 in)
1996101.1 mm (4.0 in)
199787.9 mm (3.5 in)
1998132.4 mm (5.2 in)
199975.7 mm (3.0 in)
2000130.6 mm (5.1 in)
200166.3 mm (2.6 in)
200269.6 mm (2.7 in)
2003115.3 mm (4.5 in)
2004120.7 mm (4.8 in)
200566.1 mm (2.6 in)
200672.7 mm (2.9 in)
200767.6 mm (2.7 in)
200881.3 mm (3.2 in)
2009113.0 mm (4.4 in)
201091.4 mm (3.6 in)
201175.5 mm (3.0 in)
201296.8 mm (3.8 in)
201365.5 mm (2.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Copalillo by year The longest dry spell of the year at Copalillo, 1963 to 2013. The record is 163 days in 2005, marked on the chart; the median year is 93 days. 05010015020019701980199020002010Record: 163 days in 2005
The longest dry spell of the year at Copalillo, 1963 to 2013. The record is 163 days in 2005, marked on the chart; the median year is 93 days.
Longest dry spell (CDD) at Copalillo by year
YearLongest dry spell (CDD)
19639 days
1964123 days
196594 days
196675 days
196778 days
196869 days
196993 days
1970150 days
197177 days
1972108 days
197394 days
197473 days
1975110 days
197691 days
1977132 days
197856 days
1979105 days
198063 days
198166 days
198273 days
1983102 days
1984113 days
198559 days
1986110 days
198792 days
198868 days
198994 days
1990108 days
1991129 days
1992100 days
199391 days
1994154 days
199563 days
199691 days
199799 days
199890 days
199964 days
2000140 days
200177 days
200287 days
2003146 days
200459 days
2005163 days
2006142 days
200793 days
2008119 days
200951 days
201096 days
2011110 days
201283 days
2013113 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

45 years, 1964 to 2012

A day with at least 46.5 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 116.7 mm (4.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Copalillo: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years46.5 mm (1.8 in)
5 years60.4 mm (2.4 in)
10 years71.3 mm (2.8 in)
25 years87.4 mm (3.4 in)
50 years101.2 mm (4.0 in)Longer than the 45 years of record
100 years116.7 mm (4.6 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 1964 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: 120.7 mm (4.8 in) in 2004; 90.2 mm (3.6 in) in 2000; 89.2 mm (3.5 in) in 1969.

Download the Data

  • Data for Copalillo standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Copalillo 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).