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Altotonga Weather Records (MXN00030008)

Record envelope, standing records and threshold days for Altotonga (MXN00030008), Mexico, with 87 years of record.

Key Facts for Altotonga

  • Altotonga (MXN00030008) is a weather station in Mexico at 19.75 latitude and -97.23 longitude, 1,867 m (6,125 ft) above sea level.
  • The station reports from 1925 to 2011, 87 years of record.
  • 1,464 records set at Altotonga still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Altotonga set a daily record precipitation of 38.9 mm (1.5 in) on 18 December 2011.

About the Station

  • Location: Mexico, 19.75 latitude, -97.23 longitude.
  • Elevation: 1,867 m (6,125 ft).
  • Period of record: 1925 to 2011, 87 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 Altotonga, with 2026 drawn through them The band shows the record high and record low for each calendar day at Altotonga. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -10010203040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Altotonga. 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 Altotonga, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan31.1 C (88.0 F)-2.2 C (28.0 F)n/an/a
Feb33.3 C (91.9 F)-5.0 C (23.0 F)n/an/a
Mar32.2 C (90.0 F)0.0 C (32.0 F)n/an/a
Apr31.7 C (89.1 F)-1.1 C (30.0 F)n/an/a
May31.7 C (89.1 F)0.6 C (33.1 F)n/an/a
Jun35.0 C (95.0 F)0.6 C (33.1 F)n/an/a
Jul30.6 C (87.1 F)0.6 C (33.1 F)n/an/a
Aug30.0 C (86.0 F)1.1 C (34.0 F)n/an/a
Sep30.0 C (86.0 F)0.6 C (33.1 F)n/an/a
Oct31.7 C (89.1 F)0.0 C (32.0 F)n/an/a
Nov30.0 C (86.0 F)-3.3 C (26.1 F)n/an/a
Dec30.0 C (86.0 F)-7.2 C (19.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Altotonga by the year they were set 1,464 records at Altotonga still stand. 1988 holds the most, with 122. 0501001501925: 141926: 91927: 391928: 951929: 931930: 591959: 91960: 261961: 121962: 171963: 71964: 131965: 141966: 151967: 171968: 901969: 411970: 961971: 391972: 101973: 211974: 111975: 81976: 241977: 211978: 161979: 181980: 71981: 41982: 21983: 211984: 171986: 51987: 101988: 1221989: 291990: 551991: 271993: 41994: 51995: 31997: 841998: 762001: 72002: 32003: 42004: 272006: 62007: 22008: 82009: 112010: 142011: 77192519591965197119771983199019982007
1,464 records at Altotonga still stand. 1988 holds the most, with 122.
Standing records at Altotonga by the year they were set
Year setStanding records
192514
19269
192739
192895
192993
193059
19599
196026
196112
196217
19637
196413
196514
196615
196717
196890
196941
197096
197139
197210
197321
197411
19758
197624
197721
197816
197918
19807
19814
19822
198321
198417
19865
198710
1988122
198929
199055
199127
19934
19945
19953
199784
199876
20017
20023
20034
200427
20066
20072
20088
200911
201014
201177

All-Time Record Progression

5 new records
When Altotonga set new all-time records 5 all-time records were set at Altotonga between 19 December 2003 and 17 June 2011. Each dot is a new record. Record low maximum temperatureRecord low minimum temperatureRecord high maximum temperature19 December 2003: Record low maximum temperature 2.8 C (37.0 F)20 December 2003: Record low maximum temperature 1.7 C (35.1 F)28 December 2004: Record low minimum temperature -7.2 C (19.0 F)10 June 2011: Record high maximum temperature 33.9 C (93.0 F)17 June 2011: Record high maximum temperature 35.0 C (95.0 F)20052010
5 all-time records were set at Altotonga between 19 December 2003 and 17 June 2011. Each dot is a new record.
When Altotonga set new all-time records
DateKindDetail
2003-12-19Record low maximum temperatureRecord low maximum temperature 2.8 C (37.0 F)
2003-12-20Record low maximum temperatureRecord low maximum temperature 1.7 C (35.1 F)
2004-12-28Record low minimum temperatureRecord low minimum temperature -7.2 C (19.0 F)
2011-06-10Record high maximum temperatureRecord high maximum temperature 33.9 C (93.0 F)
2011-06-17Record high maximum temperatureRecord high maximum temperature 35.0 C (95.0 F)

Wettest Day of Each Month

Sep: 239.8 mm (9.4 in)
Record daily precipitation for each month at Altotonga The wettest day on record for each calendar month at Altotonga. The most was 239.8 mm (9.4 in) on 20 September 1974. 0100200300 Jan: 71.1 mm (2.8 in), 3 January 1930 Jan Feb: 122.9 mm (4.8 in), 21 February 2009 Feb Mar: 30.0 mm (1.2 in), 28 March 1964 Mar Apr: 67.1 mm (2.6 in), 22 April 1927 Apr May: 96.8 mm (3.8 in), 31 May 2006 May Jun: 137.4 mm (5.4 in), 10 June 1979 Jun Jul: 151.9 mm (6.0 in), 7 July 2010 Jul Aug: 109.0 mm (4.3 in), 22 August 2011 Aug Sep: 239.8 mm (9.4 in), 20 September 1974 Sep Oct: 206.8 mm (8.1 in), 17 October 2009 Oct Nov: 104.4 mm (4.1 in), 18 November 2010 Nov Dec: 89.9 mm (3.5 in), 23 December 1925 Dec
The wettest day on record for each calendar month at Altotonga. The most was 239.8 mm (9.4 in) on 20 September 1974.
Record daily precipitation for each month at Altotonga
MonthRecord daily precipitation (mm)Date
Jan71.1 mm (2.8 in)3 January 1930
Feb122.9 mm (4.8 in)21 February 2009
Mar30.0 mm (1.2 in)28 March 1964
Apr67.1 mm (2.6 in)22 April 1927
May96.8 mm (3.8 in)31 May 2006
Jun137.4 mm (5.4 in)10 June 1979
Jul151.9 mm (6.0 in)7 July 2010
Aug109.0 mm (4.3 in)22 August 2011
Sep239.8 mm (9.4 in)20 September 1974
Oct206.8 mm (8.1 in)17 October 2009
Nov104.4 mm (4.1 in)18 November 2010
Dec89.9 mm (3.5 in)23 December 1925

Period of Record Coverage

1925 to 2011
Days with data per year at Altotonga 57 years of record at Altotonga, 1925 to 2011. 8 years have data for under 90 percent of days and are left out of rankings: 1925, 1926, 1959, 1985, 1998, 2001, 2002, 2003. 1925: 60 of 365 days1926: 144 of 365 days1927: 363 of 365 days1928: 364 of 366 days1929: 356 of 365 days1930: 353 of 365 days1959: 183 of 365 days1960: 360 of 366 days1961: 364 of 365 days1962: 361 of 365 days1963: 363 of 365 days1964: 365 of 366 days1965: 363 of 365 days1966: 360 of 365 days1967: 365 of 365 days1968: 365 of 366 days1969: 356 of 365 days1970: 365 of 365 days1971: 364 of 365 days1972: 345 of 366 days1973: 360 of 365 days1974: 364 of 365 days1975: 363 of 365 days1976: 356 of 366 days1977: 362 of 365 days1978: 361 of 365 days1979: 356 of 365 days1980: 366 of 366 days1981: 365 of 365 days1982: 364 of 365 days1983: 365 of 365 days1984: 366 of 366 days1985: 31 of 365 days1986: 362 of 365 days1987: 364 of 365 days1988: 363 of 366 days1989: 365 of 365 days1990: 334 of 365 days1991: 365 of 365 days1993: 364 of 365 days1994: 365 of 365 days1995: 365 of 365 days1996: 365 of 366 days1997: 362 of 365 days1998: 304 of 365 days1999: 365 of 365 days2000: 366 of 366 days2001: 271 of 365 days2002: 56 of 365 days2003: 122 of 365 days2004: 366 of 366 days2006: 355 of 365 days2007: 363 of 365 days2008: 363 of 366 days2009: 361 of 365 days2010: 363 of 365 days2011: 365 of 365 days1930196019701980199020002010
57 years of record at Altotonga, 1925 to 2011. 8 years have data for under 90 percent of days and are left out of rankings: 1925, 1926, 1959, 1985, 1998, 2001, 2002, 2003.
Days with data per year at Altotonga
YearDays with dataShare of yearComplete
19256016%No
192614439%No
192736399%Yes
192836499%Yes
192935698%Yes
193035397%Yes
195918350%No
196036098%Yes
1961364100%Yes
196236199%Yes
196336399%Yes
1964365100%Yes
196536399%Yes
196636099%Yes
1967365100%Yes
1968365100%Yes
196935698%Yes
1970365100%Yes
1971364100%Yes
197234594%Yes
197336099%Yes
1974364100%Yes
197536399%Yes
197635697%Yes
197736299%Yes
197836199%Yes
197935698%Yes
1980366100%Yes
1981365100%Yes
1982364100%Yes
1983365100%Yes
1984366100%Yes
1985318%No
198636299%Yes
1987364100%Yes
198836399%Yes
1989365100%Yes
199033492%Yes
1991365100%Yes
1993364100%Yes
1994365100%Yes
1995365100%Yes
1996365100%Yes
199736299%Yes
199830483%No
1999365100%Yes
2000366100%Yes
200127174%No
20025615%No
200312233%No
2004366100%Yes
200635597%Yes
200736399%Yes
200836399%Yes
200936199%Yes
201036399%Yes
2011365100%Yes

Latest Records

20
Latest records at Altotonga
DateStationRecordValueBeat old record byOld record stoodSignificance
18 December 2011Altotonga, MXdaily rain38.9 mm (1.5 in)22.1 mm (0.9 in)36 years41 of 100 (Notable)
8 December 2011Altotonga, MXdaily low max (Tie)10.0 C (50.0 F)tie85 years8 of 100 (Routine)
30 November 2011Altotonga, MXdaily low min0.6 C (33.1 F)0.5 C (0.9 F)52 years24 of 100 (Routine)
11 September 2011Altotonga, MXdaily rain64.3 mm (2.5 in)15.5 mm (0.6 in)6 years16 of 100 (Routine)
22 August 2011Altotonga, MXmonthly rain109.0 mm (4.3 in)3.1 mm (0.12 in)29 years28 of 100 (Routine)
17 August 2011Altotonga, MXdaily high max (Tie)25.6 C (78.1 F)tie84 years8 of 100 (Routine)
11 August 2011Altotonga, MXdaily high min (Tie)15.0 C (59.0 F)tie84 years8 of 100 (Routine)
11 August 2011Altotonga, MXdaily high max (Tie)28.9 C (84.0 F)tie20 years3 of 100 (Routine)
1 August 2011Altotonga, MXdaily high min16.7 C (62.1 F)2.8 C (5.0 F)81 years42 of 100 (Notable)
31 July 2011Altotonga, MXdaily high min16.7 C (62.1 F)2.8 C (5.0 F)82 years42 of 100 (Notable)
30 July 2011Altotonga, MXdaily high min16.7 C (62.1 F)2.8 C (5.0 F)2 years18 of 100 (Routine)
28 July 2011Altotonga, MXdaily high max (Tie)28.9 C (84.0 F)tie22 years3 of 100 (Routine)
26 July 2011Altotonga, MXdaily high min17.8 C (64.0 F)2.2 C (4.0 F)82 years40 of 100 (Notable)
25 July 2011Altotonga, MXdaily high min17.8 C (64.0 F)2.8 C (5.0 F)81 years42 of 100 (Notable)
25 July 2011Altotonga, MXdaily high max (Tie)28.9 C (84.0 F)tie22 years3 of 100 (Routine)
24 July 2011Altotonga, MXdaily high min16.7 C (62.1 F)0.6 C (1.1 F)82 years34 of 100 (Routine)
24 July 2011Altotonga, MXdaily high max (Tie)30.0 C (86.0 F)tie22 years3 of 100 (Routine)
23 July 2011Altotonga, MXdaily high min18.9 C (66.0 F)3.3 C (5.9 F)82 years44 of 100 (Notable)
23 July 2011Altotonga, MXdaily high max28.9 C (84.0 F)2.2 C (4.0 F)22 years21 of 100 (Routine)
22 July 2011Altotonga, MXdaily high min17.8 C (64.0 F)2.8 C (5.0 F)82 years42 of 100 (Notable)

Climate Trend

46 complete years, 1927 to 2011
Annual mean temperature at Altotonga as warming stripes, 1927 to 2011 One stripe for each of 46 complete years at Altotonga, 1927 to 2011. Blue stripes are years cooler than the station's own mean of 14.2 C (57.6 F); red stripes are warmer. The coolest year was 1997, at 11.7 C (53.0 F), and the warmest was 1929, at 16.9 C (62.3 F). The strongest colour marks a difference of 2.7 C (4.9 F). 1927: 15.5 C, +1.2 C from the station mean1928: 16.7 C, +2.5 C from the station mean1929: 16.9 C, +2.6 C from the station mean1930: 13.7 C, -0.5 C from the station mean1960: 14.2 C, -0.1 C from the station mean1961: 13.9 C, -0.3 C from the station mean1962: 14.0 C, -0.2 C from the station mean1963: 14.0 C, -0.2 C from the station mean1964: 14.1 C, -0.1 C from the station mean1965: 13.7 C, -0.5 C from the station mean1966: 13.7 C, -0.5 C from the station mean1967: 13.6 C, -0.7 C from the station mean1968: 12.1 C, -2.1 C from the station mean1969: 13.4 C, -0.8 C from the station mean1970: 12.8 C, -1.4 C from the station mean1971: 15.2 C, +1.0 C from the station mean1973: 15.1 C, +0.9 C from the station mean1974: 14.4 C, +0.2 C from the station mean1975: 14.6 C, +0.4 C from the station mean1976: 13.3 C, -0.9 C from the station mean1977: 14.0 C, -0.3 C from the station mean1978: 13.8 C, -0.4 C from the station mean1979: 13.9 C, -0.4 C from the station mean1980: 14.0 C, -0.2 C from the station mean1981: 13.9 C, -0.3 C from the station mean1982: 14.0 C, -0.2 C from the station mean1983: 13.9 C, -0.3 C from the station mean1984: 13.1 C, -1.1 C from the station mean1986: 14.3 C, +0.1 C from the station mean1987: 14.6 C, +0.4 C from the station mean1989: 14.0 C, -0.2 C from the station mean1991: 15.0 C, +0.8 C from the station mean1993: 14.6 C, +0.3 C from the station mean1994: 14.7 C, +0.5 C from the station mean1995: 15.0 C, +0.8 C from the station mean1996: 14.9 C, +0.7 C from the station mean1997: 11.7 C, -2.5 C from the station mean1999: 13.6 C, -0.6 C from the station mean2000: 13.5 C, -0.7 C from the station mean2004: 13.7 C, -0.5 C from the station mean2006: 14.5 C, +0.3 C from the station mean2007: 14.3 C, +0.1 C from the station mean2008: 14.5 C, +0.3 C from the station mean2009: 14.7 C, +0.5 C from the station mean2010: 14.5 C, +0.3 C from the station mean2011: 16.4 C, +2.2 C from the station mean192719401950196019701980199020002010
One stripe for each of 46 complete years at Altotonga, 1927 to 2011. Blue stripes are years cooler than the station's own mean of 14.2 C (57.6 F); red stripes are warmer. The coolest year was 1997, at 11.7 C (53.0 F), and the warmest was 1929, at 16.9 C (62.3 F). The strongest colour marks a difference of 2.7 C (4.9 F).
Annual mean temperature at Altotonga as warming stripes, 1927 to 2011
YearAnnual mean temperatureDifference from the station mean
192715.5 C+1.24 C
192816.7 C+2.46 C
192916.9 C+2.65 C
193013.7 C-0.52 C
196014.2 C-0.05 C
196113.9 C-0.27 C
196214.0 C-0.21 C
196314.0 C-0.24 C
196414.1 C-0.14 C
196513.7 C-0.53 C
196613.7 C-0.54 C
196713.6 C-0.65 C
196812.1 C-2.07 C
196913.4 C-0.78 C
197012.8 C-1.44 C
197115.2 C+1.03 C
197315.1 C+0.88 C
197414.4 C+0.21 C
197514.6 C+0.38 C
197613.3 C-0.87 C
197714.0 C-0.26 C
197813.8 C-0.40 C
197913.9 C-0.36 C
198014.0 C-0.17 C
198113.9 C-0.27 C
198214.0 C-0.20 C
198313.9 C-0.32 C
198413.1 C-1.12 C
198614.3 C+0.08 C
198714.6 C+0.36 C
198914.0 C-0.24 C
199115.0 C+0.79 C
199314.6 C+0.35 C
199414.7 C+0.48 C
199515.0 C+0.83 C
199614.9 C+0.73 C
199711.7 C-2.54 C
199913.6 C-0.58 C
200013.5 C-0.69 C
200413.7 C-0.49 C
200614.5 C+0.26 C
200714.3 C+0.06 C
200814.5 C+0.27 C
200914.7 C+0.51 C
201014.5 C+0.32 C
201116.4 C+2.23 C

The fitted trend in annual mean temperature here over 1927 to 2011 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 46 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Altotonga
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.1 C (-0.2 to 0.1) per decade-0.1 F (-0.4 to 0.1) per decade1927 to 201146Not clearly different from zero
Mean daily maximum0.17 C (-0.04 to 0.38) per decade0.3 F (-0.1 to 0.7) per decade1927 to 201146Not clearly different from zero
Mean daily minimum-0.3 C (-0.5 to -0.1) per decade-0.6 F (-1.0 to -0.2) per decade1927 to 201146Fall

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

1925 to 2011
Yearly extremes at Altotonga: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)35.0 C (95.0 F)201130.0 C (86.0 F)57
Coldest night (TNn)-7.2 C (19.0 F)20040.0 C (32.0 F)57
Wettest day (Rx1day)239.8 mm (9.4 in)197480.0 mm (3.1 in)57
Wettest five days (Rx5day)386.4 mm (15.2 in)1984164.5 mm (6.5 in)57
Longest dry spell (CDD)75 days198420 days57

Hottest day (TXx)

Hottest day (TXx) at Altotonga by year The hottest day of the year at Altotonga, 1925 to 2011. The record is 35.0 C (95.0 F) in 2011, marked on the chart; the median year is 30.0 C (86.0 F). 15202530351940196019802000Record: 35.0 C (95.0 F) in 2011
The hottest day of the year at Altotonga, 1925 to 2011. The record is 35.0 C (95.0 F) in 2011, marked on the chart; the median year is 30.0 C (86.0 F).
Hottest day (TXx) at Altotonga by year
YearHottest day (TXx)
192521.1 C (70.0 F)
192627.8 C (82.0 F)
192730.0 C (86.0 F)
192831.1 C (88.0 F)
192930.6 C (87.1 F)
193032.2 C (90.0 F)
195925.0 C (77.0 F)
196030.0 C (86.0 F)
196128.9 C (84.0 F)
196230.0 C (86.0 F)
196327.8 C (82.0 F)
196430.6 C (87.1 F)
196526.7 C (80.1 F)
196628.9 C (84.0 F)
196730.0 C (86.0 F)
196830.0 C (86.0 F)
196931.7 C (89.1 F)
197031.7 C (89.1 F)
197133.3 C (91.9 F)
197230.0 C (86.0 F)
197332.2 C (90.0 F)
197430.6 C (87.1 F)
197530.0 C (86.0 F)
197627.2 C (81.0 F)
197731.1 C (88.0 F)
197830.6 C (87.1 F)
197929.4 C (84.9 F)
198028.9 C (84.0 F)
198128.9 C (84.0 F)
198230.0 C (86.0 F)
198331.7 C (89.1 F)
198431.7 C (89.1 F)
198522.8 C (73.0 F)
198628.9 C (84.0 F)
198728.9 C (84.0 F)
198830.6 C (87.1 F)
198930.0 C (86.0 F)
199030.6 C (87.1 F)
199130.0 C (86.0 F)
199328.9 C (84.0 F)
199427.8 C (82.0 F)
199528.9 C (84.0 F)
199626.7 C (80.1 F)
199726.7 C (80.1 F)
199818.9 C (66.0 F)
199925.0 C (77.0 F)
200023.9 C (75.0 F)
200128.9 C (84.0 F)
200225.0 C (77.0 F)
200325.0 C (77.0 F)
200427.8 C (82.0 F)
200630.0 C (86.0 F)
200730.0 C (86.0 F)
200830.0 C (86.0 F)
200931.7 C (89.1 F)
201031.7 C (89.1 F)
201135.0 C (95.0 F)

Coldest night (TNn)

Coldest night (TNn) at Altotonga by year The coldest night of the year at Altotonga, 1925 to 2011. The record is -7.2 C (19.0 F) in 2004, marked on the chart; the median year is 0.0 C (32.0 F). -10-5051940196019802000Record: -7.2 C (19.0 F) in 2004
The coldest night of the year at Altotonga, 1925 to 2011. The record is -7.2 C (19.0 F) in 2004, marked on the chart; the median year is 0.0 C (32.0 F).
Coldest night (TNn) at Altotonga by year
YearColdest night (TNn)
19253.9 C (39.0 F)
19260.0 C (32.0 F)
19270.0 C (32.0 F)
19281.7 C (35.1 F)
1929-0.6 C (30.9 F)
1930-0.6 C (30.9 F)
19590.0 C (32.0 F)
1960-3.3 C (26.1 F)
19610.0 C (32.0 F)
19620.0 C (32.0 F)
1963-4.4 C (24.1 F)
19640.0 C (32.0 F)
19650.0 C (32.0 F)
1966-2.8 C (27.0 F)
1967-1.1 C (30.0 F)
19680.0 C (32.0 F)
19690.0 C (32.0 F)
1970-2.2 C (28.0 F)
19710.0 C (32.0 F)
1972-2.2 C (28.0 F)
1973-2.2 C (28.0 F)
1974-3.3 C (26.1 F)
19750.0 C (32.0 F)
1976-5.0 C (23.0 F)
1977-1.7 C (28.9 F)
19780.0 C (32.0 F)
1979-2.2 C (28.0 F)
19800.0 C (32.0 F)
19810.0 C (32.0 F)
19820.0 C (32.0 F)
1983-6.1 C (21.0 F)
1984-4.4 C (24.1 F)
19850.6 C (33.1 F)
19860.6 C (33.1 F)
19871.7 C (35.1 F)
19880.6 C (33.1 F)
19890.0 C (32.0 F)
19901.7 C (35.1 F)
1991-0.6 C (30.9 F)
19935.0 C (41.0 F)
19945.0 C (41.0 F)
19955.0 C (41.0 F)
19962.8 C (37.0 F)
19970.6 C (33.1 F)
19985.0 C (41.0 F)
19993.9 C (39.0 F)
20003.9 C (39.0 F)
20010.6 C (33.1 F)
2002-1.1 C (30.0 F)
2003-5.6 C (21.9 F)
2004-7.2 C (19.0 F)
2006-2.2 C (28.0 F)
20070.6 C (33.1 F)
2008-2.2 C (28.0 F)
20090.6 C (33.1 F)
2010-1.1 C (30.0 F)
20110.6 C (33.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Altotonga by year The wettest day of the year at Altotonga, 1925 to 2011. The record is 239.8 mm (9.4 in) in 1974, marked on the chart; the median year is 80.0 mm (3.1 in). 01002003001940196019802000Record: 239.8 mm (9.4 in) in 1974
The wettest day of the year at Altotonga, 1925 to 2011. The record is 239.8 mm (9.4 in) in 1974, marked on the chart; the median year is 80.0 mm (3.1 in).
Wettest day (Rx1day) at Altotonga by year
YearWettest day (Rx1day)
192589.9 mm (3.5 in)
1926125.0 mm (4.9 in)
1927111.3 mm (4.4 in)
1928136.7 mm (5.4 in)
1929154.4 mm (6.1 in)
193073.7 mm (2.9 in)
195997.3 mm (3.8 in)
196075.9 mm (3.0 in)
1961110.0 mm (4.3 in)
196245.0 mm (1.8 in)
196364.8 mm (2.6 in)
196467.3 mm (2.6 in)
196564.8 mm (2.6 in)
1966110.0 mm (4.3 in)
196795.0 mm (3.7 in)
196874.9 mm (2.9 in)
196965.8 mm (2.6 in)
197059.9 mm (2.4 in)
197197.8 mm (3.9 in)
197270.9 mm (2.8 in)
197363.8 mm (2.5 in)
1974239.8 mm (9.4 in)
1975129.8 mm (5.1 in)
1976105.9 mm (4.2 in)
197753.8 mm (2.1 in)
1978163.8 mm (6.4 in)
1979137.4 mm (5.4 in)
1980110.5 mm (4.4 in)
1981105.9 mm (4.2 in)
1982119.9 mm (4.7 in)
198380.0 mm (3.1 in)
1984110.0 mm (4.3 in)
19854.8 mm (0.19 in)
198657.9 mm (2.3 in)
198749.8 mm (2.0 in)
198847.8 mm (1.9 in)
198959.9 mm (2.4 in)
199069.9 mm (2.8 in)
199149.8 mm (2.0 in)
1993114.8 mm (4.5 in)
199430.0 mm (1.2 in)
199549.8 mm (2.0 in)
199637.8 mm (1.5 in)
199730.0 mm (1.2 in)
199847.8 mm (1.9 in)
199939.9 mm (1.6 in)
200039.9 mm (1.6 in)
2001119.4 mm (4.7 in)
200278.5 mm (3.1 in)
2003128.8 mm (5.1 in)
200464.8 mm (2.6 in)
200696.8 mm (3.8 in)
2007145.3 mm (5.7 in)
2008144.8 mm (5.7 in)
2009206.8 mm (8.1 in)
2010199.9 mm (7.9 in)
2011109.0 mm (4.3 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Altotonga by year The wettest five days of the year at Altotonga, 1925 to 2011. The record is 386.4 mm (15.2 in) in 1984, marked on the chart; the median year is 164.5 mm (6.5 in). 01002003004001940196019802000Record: 386.4 mm (15.2 in) in 1984
The wettest five days of the year at Altotonga, 1925 to 2011. The record is 386.4 mm (15.2 in) in 1984, marked on the chart; the median year is 164.5 mm (6.5 in).
Wettest five days (Rx5day) at Altotonga by year
YearWettest five days (Rx5day)
1925185.4 mm (7.3 in)
1926257.1 mm (10.1 in)
1927209.9 mm (8.3 in)
1928225.6 mm (8.9 in)
1929336.9 mm (13.3 in)
1930232.8 mm (9.2 in)
1959154.8 mm (6.1 in)
1960125.7 mm (4.9 in)
1961200.5 mm (7.9 in)
1962125.0 mm (4.9 in)
1963102.4 mm (4.0 in)
1964107.0 mm (4.2 in)
1965111.5 mm (4.4 in)
1966220.9 mm (8.7 in)
1967196.5 mm (7.7 in)
1968164.5 mm (6.5 in)
1969203.5 mm (8.0 in)
1970158.3 mm (6.2 in)
1971232.5 mm (9.2 in)
1972228.4 mm (9.0 in)
1973104.7 mm (4.1 in)
1974320.0 mm (12.6 in)
1975293.7 mm (11.6 in)
1976265.9 mm (10.5 in)
1977108.7 mm (4.3 in)
1978210.5 mm (8.3 in)
1979148.4 mm (5.8 in)
1980181.1 mm (7.1 in)
1981266.1 mm (10.5 in)
1982247.9 mm (9.8 in)
198399.8 mm (3.9 in)
1984386.4 mm (15.2 in)
19854.8 mm (0.19 in)
1986124.5 mm (4.9 in)
1987119.2 mm (4.7 in)
1988154.5 mm (6.1 in)
1989148.6 mm (5.9 in)
1990141.3 mm (5.6 in)
199187.4 mm (3.4 in)
1993284.3 mm (11.2 in)
199477.5 mm (3.1 in)
199598.6 mm (3.9 in)
1996124.4 mm (4.9 in)
199790.7 mm (3.6 in)
1998162.4 mm (6.4 in)
1999114.6 mm (4.5 in)
200093.2 mm (3.7 in)
2001237.0 mm (9.3 in)
2002141.7 mm (5.6 in)
2003283.5 mm (11.2 in)
2004136.9 mm (5.4 in)
2006153.0 mm (6.0 in)
2007184.4 mm (7.3 in)
2008300.1 mm (11.8 in)
2009313.5 mm (12.3 in)
2010247.4 mm (9.7 in)
2011239.1 mm (9.4 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Altotonga by year The longest dry spell of the year at Altotonga, 1925 to 2011. The record is 75 days in 1984, marked on the chart; the median year is 20 days. 0204060801940196019802000Record: 75 days in 1984
The longest dry spell of the year at Altotonga, 1925 to 2011. The record is 75 days in 1984, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Altotonga by year
YearLongest dry spell (CDD)
19257 days
192611 days
192727 days
192816 days
192944 days
193026 days
195912 days
196018 days
196122 days
196221 days
196335 days
196434 days
196543 days
196619 days
196719 days
196813 days
196919 days
197024 days
197120 days
197219 days
197317 days
197421 days
197530 days
197613 days
197717 days
197825 days
197915 days
198018 days
198121 days
198217 days
198347 days
198475 days
198511 days
198656 days
198728 days
198839 days
198920 days
199026 days
199125 days
199313 days
199412 days
199511 days
199614 days
199715 days
199837 days
199919 days
200015 days
200129 days
200235 days
200326 days
200418 days
200616 days
200719 days
200817 days
200920 days
201025 days
201120 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

51 years, 1927 to 2011

A day with at least 83.0 mm (3.3 in) of rain is expected about once in 2 years. A day with at least 256.6 mm (10.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Altotonga: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years83.0 mm (3.3 in)
5 years125.0 mm (4.9 in)
10 years154.5 mm (6.1 in)
25 years193.8 mm (7.6 in)
50 years224.6 mm (8.8 in)
100 years256.6 mm (10.1 in)Longer than the 51 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, 51 years of values from 1927 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: 239.8 mm (9.4 in) in 1974; 206.8 mm (8.1 in) in 2009; 199.9 mm (7.9 in) in 2010.

Download the Data

  • Data for Altotonga standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Altotonga 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).