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C.I.A.P.Y. Weather Records (MXN00031005)

Record envelope, standing records and threshold days for C.I.A.P.Y. (MXN00031005), Mexico, with 37 years of record.

Key Facts for C.I.A.P.Y.

  • C.I.A.P.Y. (MXN00031005) is a weather station in Mexico at 20.42 latitude and -89.75 longitude, 50 m (164 ft) above sea level.
  • The station reports from 1969 to 2005, 37 years of record.
  • 1,464 records set at C.I.A.P.Y. still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • C.I.A.P.Y. tied a daily record high minimum temperature of 20.0 C (68.0 F) on 31 December 2005.

About the Station

  • Location: Mexico, 20.42 latitude, -89.75 longitude.
  • Elevation: 50 m (164 ft).
  • Period of record: 1969 to 2005, 37 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 C.I.A.P.Y., with 2026 drawn through them The band shows the record high and record low for each calendar day at C.I.A.P.Y.. 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 C.I.A.P.Y.. 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 C.I.A.P.Y., with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan38.3 C (100.9 F)3.9 C (39.0 F)n/an/a
Feb41.1 C (106.0 F)2.8 C (37.0 F)n/an/a
Mar43.3 C (109.9 F)1.7 C (35.1 F)n/an/a
Apr45.0 C (113.0 F)5.0 C (41.0 F)n/an/a
May43.9 C (111.0 F)5.6 C (42.1 F)n/an/a
Jun42.8 C (109.0 F)15.0 C (59.0 F)n/an/a
Jul41.1 C (106.0 F)12.8 C (55.0 F)n/an/a
Aug40.0 C (104.0 F)15.0 C (59.0 F)n/an/a
Sep38.9 C (102.0 F)15.0 C (59.0 F)n/an/a
Oct38.9 C (102.0 F)8.9 C (48.0 F)n/an/a
Nov39.4 C (102.9 F)4.4 C (39.9 F)n/an/a
Dec38.3 C (100.9 F)1.7 C (35.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at C.I.A.P.Y. by the year they were set 1,464 records at C.I.A.P.Y. still stand. 1998 holds the most, with 118. 0501001501969: 241970: 441971: 331972: 341973: 481974: 251975: 271976: 241977: 71978: 351979: 181980: 531981: 161982: 251983: 291984: 391985: 361986: 331987: 301988: 301989: 361990: 691991: 481992: 841993: 711994: 651995: 521996: 401997: 441998: 1181999: 312000: 282001: 372002: 262003: 262004: 372005: 421969197319771981198519891993199720012005
1,464 records at C.I.A.P.Y. still stand. 1998 holds the most, with 118.
Standing records at C.I.A.P.Y. by the year they were set
Year setStanding records
196924
197044
197133
197234
197348
197425
197527
197624
19777
197835
197918
198053
198116
198225
198329
198439
198536
198633
198730
198830
198936
199069
199148
199284
199371
199465
199552
199640
199744
1998118
199931
200028
200137
200226
200326
200437
200542

All-Time Record Progression

2 new records
When C.I.A.P.Y. set new all-time records 2 all-time records were set at C.I.A.P.Y. between 25 September 2002 and 1 July 2005. Each dot is a new record. Record daily precipitationRecord high minimum temperature25 September 2002: Record daily precipitation 342.4 mm (13.5 in)1 July 2005: Record high minimum temperature 28.9 C (84.0 F)2005
2 all-time records were set at C.I.A.P.Y. between 25 September 2002 and 1 July 2005. Each dot is a new record.
When C.I.A.P.Y. set new all-time records
DateKindDetail
2002-09-25Record daily precipitationRecord daily precipitation 342.4 mm (13.5 in)
2005-07-01Record high minimum temperatureRecord high minimum temperature 28.9 C (84.0 F)

Wettest Day of Each Month

Sep: 342.4 mm (13.5 in)
Record daily precipitation for each month at C.I.A.P.Y. The wettest day on record for each calendar month at C.I.A.P.Y.. The most was 342.4 mm (13.5 in) on 25 September 2002. 0100200300400 Jan: 79.8 mm (3.1 in), 2 January 1988 Jan Feb: 48.5 mm (1.9 in), 3 February 1982 Feb Mar: 85.6 mm (3.4 in), 15 March 1995 Mar Apr: 126.0 mm (5.0 in), 14 April 1985 Apr May: 222.8 mm (8.8 in), 30 May 1982 May Jun: 142.0 mm (5.6 in), 2 June 1970 Jun Jul: 88.9 mm (3.5 in), 25 July 1977 Jul Aug: 95.8 mm (3.8 in), 2 August 1995 Aug Sep: 342.4 mm (13.5 in), 25 September 2002 Sep Oct: 104.9 mm (4.1 in), 22 October 1973 Oct Nov: 111.0 mm (4.4 in), 3 November 2001 Nov Dec: 74.9 mm (2.9 in), 19 December 1994 Dec
The wettest day on record for each calendar month at C.I.A.P.Y.. The most was 342.4 mm (13.5 in) on 25 September 2002.
Record daily precipitation for each month at C.I.A.P.Y.
MonthRecord daily precipitation (mm)Date
Jan79.8 mm (3.1 in)2 January 1988
Feb48.5 mm (1.9 in)3 February 1982
Mar85.6 mm (3.4 in)15 March 1995
Apr126.0 mm (5.0 in)14 April 1985
May222.8 mm (8.8 in)30 May 1982
Jun142.0 mm (5.6 in)2 June 1970
Jul88.9 mm (3.5 in)25 July 1977
Aug95.8 mm (3.8 in)2 August 1995
Sep342.4 mm (13.5 in)25 September 2002
Oct104.9 mm (4.1 in)22 October 1973
Nov111.0 mm (4.4 in)3 November 2001
Dec74.9 mm (2.9 in)19 December 1994

Period of Record Coverage

1969 to 2005
Days with data per year at C.I.A.P.Y. 37 years of record at C.I.A.P.Y., 1969 to 2005. 7 years have data for under 90 percent of days and are left out of rankings: 1969, 1972, 1976, 1977, 1981, 1983, 1989. 1969: 215 of 365 days1970: 365 of 365 days1971: 364 of 365 days1972: 305 of 366 days1973: 365 of 365 days1974: 364 of 365 days1975: 334 of 365 days1976: 305 of 366 days1977: 123 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 334 of 366 days1981: 304 of 365 days1982: 365 of 365 days1983: 242 of 365 days1984: 366 of 366 days1985: 365 of 365 days1986: 365 of 365 days1987: 364 of 365 days1988: 366 of 366 days1989: 274 of 365 days1990: 334 of 365 days1991: 334 of 365 days1992: 365 of 366 days1993: 365 of 365 days1994: 365 of 365 days1995: 364 of 365 days1996: 366 of 366 days1997: 359 of 365 days1998: 365 of 365 days1999: 356 of 365 days2000: 366 of 366 days2001: 359 of 365 days2002: 355 of 365 days2003: 365 of 365 days2004: 366 of 366 days2005: 338 of 365 days19701975198019851990199520002005
37 years of record at C.I.A.P.Y., 1969 to 2005. 7 years have data for under 90 percent of days and are left out of rankings: 1969, 1972, 1976, 1977, 1981, 1983, 1989.
Days with data per year at C.I.A.P.Y.
YearDays with dataShare of yearComplete
196921559%No
1970365100%Yes
1971364100%Yes
197230583%No
1973365100%Yes
1974364100%Yes
197533492%Yes
197630583%No
197712334%No
1978365100%Yes
1979365100%Yes
198033491%Yes
198130483%No
1982365100%Yes
198324266%No
1984366100%Yes
1985365100%Yes
1986365100%Yes
1987364100%Yes
1988366100%Yes
198927475%No
199033492%Yes
199133492%Yes
1992365100%Yes
1993365100%Yes
1994365100%Yes
1995364100%Yes
1996366100%Yes
199735998%Yes
1998365100%Yes
199935698%Yes
2000366100%Yes
200135998%Yes
200235597%Yes
2003365100%Yes
2004366100%Yes
200533893%Yes

Latest Records

20
Latest records at C.I.A.P.Y.
DateStationRecordValueBeat old record byOld record stoodSignificance
31 December 2005C.I.A.P.Y., MXdaily high min (Tie)20.0 C (68.0 F)tie30 years3 of 100 (Routine)
21 December 2005C.I.A.P.Y., MXdaily high min (Tie)20.6 C (69.1 F)tie8 years1 of 100 (Routine)
20 December 2005C.I.A.P.Y., MXdaily rain40.9 mm (1.6 in)35.1 mm (1.4 in)8 years35 of 100 (Notable)
30 November 2005C.I.A.P.Y., MXdaily rain8.4 mm (0.33 in)1.0 mm (0.04 in)15 years7 of 100 (Routine)
29 November 2005C.I.A.P.Y., MXdaily low min8.9 C (48.0 F)0.5 C (0.9 F)6 years5 of 100 (Routine)
29 November 2005C.I.A.P.Y., MXdaily high max (Tie)33.9 C (93.0 F)tie34 years3 of 100 (Routine)
24 November 2005C.I.A.P.Y., MXdaily low min7.8 C (46.0 F)1.6 C (2.9 F)12 years10 of 100 (Routine)
23 November 2005C.I.A.P.Y., MXdaily low max21.7 C (71.1 F)2.2 C (4.0 F)20 years17 of 100 (Routine)
23 November 2005C.I.A.P.Y., MXdaily low min8.9 C (48.0 F)1.1 C (2.0 F)15 years9 of 100 (Routine)
13 November 2005C.I.A.P.Y., MXdaily rain15.0 mm (0.6 in)8.4 mm (0.33 in)26 years14 of 100 (Routine)
9 November 2005C.I.A.P.Y., MXmonthly high min25.0 C (77.0 F)0.6 C (1.1 F)33 years24 of 100 (Routine)
8 November 2005C.I.A.P.Y., MXdaily high min21.7 C (71.1 F)0.6 C (1.1 F)8 years6 of 100 (Routine)
20 October 2005C.I.A.P.Y., MXdaily rain31.8 mm (1.3 in)2.6 mm (0.10 in)12 years7 of 100 (Routine)
15 October 2005C.I.A.P.Y., MXdaily high min22.8 C (73.0 F)0.6 C (1.1 F)4 years6 of 100 (Routine)
14 October 2005C.I.A.P.Y., MXdaily high min (Tie)22.8 C (73.0 F)tie6 years1 of 100 (Routine)
12 October 2005C.I.A.P.Y., MXdaily low max25.6 C (78.1 F)0.5 C (0.9 F)15 years9 of 100 (Routine)
10 October 2005C.I.A.P.Y., MXdaily low max (Tie)27.8 C (82.0 F)tie16 years2 of 100 (Routine)
4 October 2005C.I.A.P.Y., MXdaily rain61.5 mm (2.4 in)12.2 mm (0.5 in)16 years14 of 100 (Routine)
2 October 2005C.I.A.P.Y., MXdaily high min (Tie)23.3 C (73.9 F)tie24 years2 of 100 (Routine)
29 September 2005C.I.A.P.Y., MXdaily rain50.3 mm (2.0 in)23.9 mm (0.9 in)8 years15 of 100 (Routine)

Climate Trend

26 complete years, 1970 to 2005
Annual mean temperature at C.I.A.P.Y. as warming stripes, 1970 to 2005 One stripe for each of 26 complete years at C.I.A.P.Y., 1970 to 2005. Blue stripes are years cooler than the station's own mean of 25.3 C (77.5 F); red stripes are warmer. The coolest year was 1993, at 22.0 C (71.7 F), and the warmest was 1998, at 27.3 C (81.1 F). The strongest colour marks a difference of 3.3 C (5.9 F). 1970: 25.8 C, +0.5 C from the station mean1971: 26.2 C, +0.9 C from the station mean1973: 26.3 C, +1.0 C from the station mean1974: 25.5 C, +0.2 C from the station mean1978: 26.2 C, +0.9 C from the station mean1979: 26.0 C, +0.7 C from the station mean1982: 26.2 C, +0.9 C from the station mean1984: 24.4 C, -0.9 C from the station mean1985: 24.1 C, -1.2 C from the station mean1986: 24.3 C, -1.0 C from the station mean1987: 24.3 C, -1.0 C from the station mean1988: 24.6 C, -0.7 C from the station mean1992: 22.3 C, -3.0 C from the station mean1993: 22.0 C, -3.3 C from the station mean1994: 22.4 C, -2.9 C from the station mean1995: 24.0 C, -1.3 C from the station mean1996: 26.2 C, +0.9 C from the station mean1997: 26.5 C, +1.2 C from the station mean1998: 27.3 C, +2.0 C from the station mean1999: 26.2 C, +0.9 C from the station mean2000: 26.1 C, +0.8 C from the station mean2001: 26.5 C, +1.2 C from the station mean2002: 26.6 C, +1.3 C from the station mean2003: 26.2 C, +0.9 C from the station mean2004: 26.1 C, +0.8 C from the station mean2005: 25.6 C, +0.3 C from the station mean19701975198019851990199520002005
One stripe for each of 26 complete years at C.I.A.P.Y., 1970 to 2005. Blue stripes are years cooler than the station's own mean of 25.3 C (77.5 F); red stripes are warmer. The coolest year was 1993, at 22.0 C (71.7 F), and the warmest was 1998, at 27.3 C (81.1 F). The strongest colour marks a difference of 3.3 C (5.9 F).
Annual mean temperature at C.I.A.P.Y. as warming stripes, 1970 to 2005
YearAnnual mean temperatureDifference from the station mean
197025.8 C+0.48 C
197126.2 C+0.89 C
197326.3 C+1.00 C
197425.5 C+0.19 C
197826.2 C+0.91 C
197926.0 C+0.68 C
198226.2 C+0.87 C
198424.4 C-0.91 C
198524.1 C-1.18 C
198624.3 C-1.01 C
198724.3 C-1.04 C
198824.6 C-0.73 C
199222.3 C-2.97 C
199322.0 C-3.26 C
199422.4 C-2.85 C
199524.0 C-1.25 C
199626.2 C+0.86 C
199726.5 C+1.21 C
199827.3 C+1.96 C
199926.2 C+0.94 C
200026.1 C+0.76 C
200126.5 C+1.20 C
200226.6 C+1.28 C
200326.2 C+0.91 C
200426.1 C+0.81 C
200525.6 C+0.35 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1969 to 2005
Yearly extremes at C.I.A.P.Y.: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)45.0 C (113.0 F)199840.6 C (105.1 F)37
Coldest night (TNn)1.7 C (35.1 F)19905.0 C (41.0 F)37
Wettest day (Rx1day)342.4 mm (13.5 in)200285.9 mm (3.4 in)37
Wettest five days (Rx5day)349.1 mm (13.7 in)2002137.2 mm (5.4 in)37
Longest dry spell (CDD)84 days197039 days37

Hottest day (TXx)

Hottest day (TXx) at C.I.A.P.Y. by year The hottest day of the year at C.I.A.P.Y., 1969 to 2005. The record is 45.0 C (113.0 F) in 1998, marked on the chart; the median year is 40.6 C (105.1 F). 3537.54042.5451970198019902000Record: 45.0 C (113.0 F) in 1998
The hottest day of the year at C.I.A.P.Y., 1969 to 2005. The record is 45.0 C (113.0 F) in 1998, marked on the chart; the median year is 40.6 C (105.1 F).
Hottest day (TXx) at C.I.A.P.Y. by year
YearHottest day (TXx)
196940.6 C (105.1 F)
197040.6 C (105.1 F)
197142.8 C (109.0 F)
197240.0 C (104.0 F)
197341.1 C (106.0 F)
197440.6 C (105.1 F)
197541.7 C (107.1 F)
197638.9 C (102.0 F)
197738.9 C (102.0 F)
197843.9 C (111.0 F)
197940.0 C (104.0 F)
198042.8 C (109.0 F)
198140.0 C (104.0 F)
198240.6 C (105.1 F)
198340.6 C (105.1 F)
198441.7 C (107.1 F)
198540.0 C (104.0 F)
198637.8 C (100.0 F)
198738.9 C (102.0 F)
198840.0 C (104.0 F)
198938.9 C (102.0 F)
199038.3 C (100.9 F)
199138.3 C (100.9 F)
199238.9 C (102.0 F)
199335.0 C (95.0 F)
199435.0 C (95.0 F)
199538.9 C (102.0 F)
199640.0 C (104.0 F)
199740.6 C (105.1 F)
199845.0 C (113.0 F)
199943.9 C (111.0 F)
200043.3 C (109.9 F)
200141.7 C (107.1 F)
200241.7 C (107.1 F)
200341.7 C (107.1 F)
200442.8 C (109.0 F)
200543.9 C (111.0 F)

Coldest night (TNn)

Coldest night (TNn) at C.I.A.P.Y. by year The coldest night of the year at C.I.A.P.Y., 1969 to 2005. The record is 1.7 C (35.1 F) in 1990, marked on the chart; the median year is 5.0 C (41.0 F). 02.557.51012.51970198019902000Record: 1.7 C (35.1 F) in 1990
The coldest night of the year at C.I.A.P.Y., 1969 to 2005. The record is 1.7 C (35.1 F) in 1990, marked on the chart; the median year is 5.0 C (41.0 F).
Coldest night (TNn) at C.I.A.P.Y. by year
YearColdest night (TNn)
19697.8 C (46.0 F)
19702.8 C (37.0 F)
19713.3 C (37.9 F)
19724.4 C (39.9 F)
19734.4 C (39.9 F)
19745.0 C (41.0 F)
19755.6 C (42.1 F)
19765.0 C (41.0 F)
197711.7 C (53.1 F)
19785.0 C (41.0 F)
19796.1 C (43.0 F)
19803.9 C (39.0 F)
19813.9 C (39.0 F)
19825.6 C (42.1 F)
19836.1 C (43.0 F)
19845.6 C (42.1 F)
19854.4 C (39.9 F)
19865.0 C (41.0 F)
19875.0 C (41.0 F)
19885.0 C (41.0 F)
19892.8 C (37.0 F)
19901.7 C (35.1 F)
19912.8 C (37.0 F)
19923.9 C (39.0 F)
19931.7 C (35.1 F)
19943.3 C (37.9 F)
19956.1 C (43.0 F)
19966.7 C (44.1 F)
19977.8 C (46.0 F)
19985.0 C (41.0 F)
19995.0 C (41.0 F)
20005.0 C (41.0 F)
20015.0 C (41.0 F)
20025.0 C (41.0 F)
20035.6 C (42.1 F)
20045.0 C (41.0 F)
20054.4 C (39.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at C.I.A.P.Y. by year The wettest day of the year at C.I.A.P.Y., 1969 to 2005. The record is 342.4 mm (13.5 in) in 2002, marked on the chart; the median year is 85.9 mm (3.4 in). 01002003004001970198019902000Record: 342.4 mm (13.5 in) in 2002
The wettest day of the year at C.I.A.P.Y., 1969 to 2005. The record is 342.4 mm (13.5 in) in 2002, marked on the chart; the median year is 85.9 mm (3.4 in).
Wettest day (Rx1day) at C.I.A.P.Y. by year
YearWettest day (Rx1day)
1969111.0 mm (4.4 in)
1970142.0 mm (5.6 in)
197163.5 mm (2.5 in)
197266.8 mm (2.6 in)
1973104.9 mm (4.1 in)
197486.9 mm (3.4 in)
197599.8 mm (3.9 in)
197684.8 mm (3.3 in)
197788.9 mm (3.5 in)
197898.8 mm (3.9 in)
197990.2 mm (3.6 in)
198074.4 mm (2.9 in)
198182.0 mm (3.2 in)
1982222.8 mm (8.8 in)
198379.8 mm (3.1 in)
1984162.3 mm (6.4 in)
1985126.0 mm (5.0 in)
198662.0 mm (2.4 in)
198771.9 mm (2.8 in)
198879.8 mm (3.1 in)
198985.9 mm (3.4 in)
199084.6 mm (3.3 in)
199187.4 mm (3.4 in)
199281.5 mm (3.2 in)
199379.8 mm (3.1 in)
199474.9 mm (2.9 in)
199595.8 mm (3.8 in)
199654.9 mm (2.2 in)
199770.9 mm (2.8 in)
199880.5 mm (3.2 in)
199967.6 mm (2.7 in)
200098.6 mm (3.9 in)
2001111.0 mm (4.4 in)
2002342.4 mm (13.5 in)
200395.0 mm (3.7 in)
200497.0 mm (3.8 in)
200569.3 mm (2.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at C.I.A.P.Y. by year The wettest five days of the year at C.I.A.P.Y., 1969 to 2005. The record is 349.1 mm (13.7 in) in 2002, marked on the chart; the median year is 137.2 mm (5.4 in). 01002003004001970198019902000Record: 349.1 mm (13.7 in) in 2002
The wettest five days of the year at C.I.A.P.Y., 1969 to 2005. The record is 349.1 mm (13.7 in) in 2002, marked on the chart; the median year is 137.2 mm (5.4 in).
Wettest five days (Rx5day) at C.I.A.P.Y. by year
YearWettest five days (Rx5day)
1969172.0 mm (6.8 in)
1970250.7 mm (9.9 in)
1971113.1 mm (4.5 in)
1972177.6 mm (7.0 in)
1973158.5 mm (6.2 in)
1974189.0 mm (7.4 in)
1975168.9 mm (6.6 in)
1976114.2 mm (4.5 in)
1977124.5 mm (4.9 in)
1978126.0 mm (5.0 in)
1979105.1 mm (4.1 in)
1980102.8 mm (4.0 in)
1981152.6 mm (6.0 in)
1982240.8 mm (9.5 in)
1983144.8 mm (5.7 in)
1984215.9 mm (8.5 in)
1985153.1 mm (6.0 in)
1986132.6 mm (5.2 in)
1987146.8 mm (5.8 in)
1988152.6 mm (6.0 in)
1989121.7 mm (4.8 in)
1990137.2 mm (5.4 in)
1991118.4 mm (4.7 in)
1992131.7 mm (5.2 in)
1993140.9 mm (5.5 in)
1994140.5 mm (5.5 in)
1995213.7 mm (8.4 in)
199684.6 mm (3.3 in)
1997104.2 mm (4.1 in)
1998119.9 mm (4.7 in)
1999106.2 mm (4.2 in)
2000151.4 mm (6.0 in)
2001116.6 mm (4.6 in)
2002349.1 mm (13.7 in)
2003135.4 mm (5.3 in)
2004126.2 mm (5.0 in)
2005124.1 mm (4.9 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at C.I.A.P.Y. by year The longest dry spell of the year at C.I.A.P.Y., 1969 to 2005. The record is 84 days in 1970, marked on the chart; the median year is 39 days. 0204060801001970198019902000Record: 84 days in 1970
The longest dry spell of the year at C.I.A.P.Y., 1969 to 2005. The record is 84 days in 1970, marked on the chart; the median year is 39 days.
Longest dry spell (CDD) at C.I.A.P.Y. by year
YearLongest dry spell (CDD)
196931 days
197084 days
197165 days
197228 days
197344 days
197431 days
197576 days
197639 days
19778 days
197832 days
197938 days
198048 days
198125 days
198233 days
198346 days
198445 days
198529 days
198644 days
198753 days
198852 days
198925 days
199031 days
199137 days
199234 days
199343 days
199419 days
199552 days
199644 days
199735 days
199841 days
199937 days
200038 days
200141 days
200235 days
200374 days
200443 days
200574 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

30 years, 1970 to 2005

A day with at least 84.8 mm (3.3 in) of rain is expected about once in 2 years. A day with at least 358.4 mm (14.1 in) of rain is expected about once in 100 years.

Rainfall return levels at C.I.A.P.Y.: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years84.8 mm (3.3 in)
5 years115.8 mm (4.6 in)
10 years147.3 mm (5.8 in)
25 years206.5 mm (8.1 in)
50 years270.5 mm (10.6 in)Longer than the 30 years of record
100 years358.4 mm (14.1 in)Longer than the 30 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, 30 years of values from 1970 to 2005.

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: 342.4 mm (13.5 in) in 2002; 222.8 mm (8.8 in) in 1982; 162.3 mm (6.4 in) in 1984.

Download the Data

  • Data for C.I.A.P.Y. standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for C.I.A.P.Y. 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).