Tonala (Smn) Weather Records (MXN00007201)

Record envelope, standing records and threshold days for Tonala (Smn) (MXN00007201), Mexico, with 80 years of record.

Key Facts for Tonala (Smn)

Tonala (Smn) (MXN00007201) is a weather station in Mexico at 16.08 latitude and -93.73 longitude, 50 m (164 ft) above sea level.
The station reports from 1922 to 2001, 80 years of record.
1,464 records set at Tonala (Smn) still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Tonala (Smn) tied a daily record high minimum temperature of 26.7 C (80.1 F) on 21 September 2001.

About the Station

Location: Mexico, 16.08 latitude, -93.73 longitude.
Elevation: 50 m (164 ft).
Period of record: 1922 to 2001, 80 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Tonala (Smn). 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 Tonala (Smn), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	40.0 C (104.0 F)	13.9 C (57.0 F)	n/a	n/a
Feb	40.6 C (105.1 F)	13.9 C (57.0 F)	n/a	n/a
Mar	42.8 C (109.0 F)	12.8 C (55.0 F)	n/a	n/a
Apr	43.9 C (111.0 F)	15.0 C (59.0 F)	n/a	n/a
May	42.8 C (109.0 F)	16.7 C (62.1 F)	n/a	n/a
Jun	42.8 C (109.0 F)	12.8 C (55.0 F)	n/a	n/a
Jul	42.8 C (109.0 F)	15.0 C (59.0 F)	n/a	n/a
Aug	43.9 C (111.0 F)	16.1 C (61.0 F)	n/a	n/a
Sep	40.0 C (104.0 F)	17.8 C (64.0 F)	n/a	n/a
Oct	40.0 C (104.0 F)	16.7 C (62.1 F)	n/a	n/a
Nov	38.9 C (102.0 F)	15.0 C (59.0 F)	n/a	n/a
Dec	38.9 C (102.0 F)	11.7 C (53.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Tonala (Smn) still stand. 1922 holds the most, with 140.

Standing records at Tonala (Smn) by the year they were set
Year set	Standing records
1922	140
1923	3
1924	54
1926	3
1927	1
1928	47
1929	16
1930	10
1931	15
1933	27
1934	25
1935	27
1936	14
1937	10
1938	19
1954	35
1959	33
1960	46
1961	29
1962	22
1963	33
1964	31
1965	42
1966	32
1967	33
1968	32
1969	21
1970	41
1971	4
1972	19
1973	29
1974	38
1975	23
1976	34
1977	43
1978	17
1979	21
1980	10
1981	28
1982	7
1983	48
1984	13
1985	23
1986	69
1987	75
1988	33
1989	11
1990	2
1991	1
1992	15
1996	6
1997	17
1998	16
1999	4
2001	17

Wettest Day of Each Month

Sep: 406.9 mm (16.0 in)

The wettest day on record for each calendar month at Tonala (Smn). The most was 406.9 mm (16.0 in) on 22 September 1963.

Record daily precipitation for each month at Tonala (Smn)
Month	Record daily precipitation (mm)	Date
Jan	31.0 mm (1.2 in)	10 January 1974
Feb	42.9 mm (1.7 in)	20 February 1982
Mar	82.8 mm (3.3 in)	8 March 1934
Apr	63.0 mm (2.5 in)	19 April 1972
May	112.3 mm (4.4 in)	30 May 1986
Jun	202.9 mm (8.0 in)	1 June 1981
Jul	161.8 mm (6.4 in)	20 July 1961
Aug	184.9 mm (7.3 in)	31 August 1973
Sep	406.9 mm (16.0 in)	22 September 1963
Oct	137.4 mm (5.4 in)	13 October 1923
Nov	101.9 mm (4.0 in)	9 November 1963
Dec	38.9 mm (1.5 in)	21 December 1970

Period of Record Coverage

1922 to 2001

55 years of record at Tonala (Smn), 1922 to 2001. 12 years have data for under 90 percent of days and are left out of rankings: 1922, 1926, 1927, 1928, 1988, 1990, 1991, 1992 and others.

Days with data per year at Tonala (Smn)
Year	Days with data	Share of year	Complete
1922	319	87%	No
1923	365	100%	Yes
1924	365	100%	Yes
1926	274	75%	No
1927	23	6%	No
1928	243	66%	No
1929	357	98%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1933	364	100%	Yes
1934	365	100%	Yes
1935	363	99%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1954	363	99%	Yes
1959	364	100%	Yes
1960	365	100%	Yes
1961	365	100%	Yes
1962	364	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	365	100%	Yes
1973	363	99%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	364	100%	Yes
1978	334	92%	Yes
1979	335	92%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	305	83%	No
1989	337	92%	Yes
1990	91	25%	No
1991	179	49%	No
1992	120	33%	No
1996	361	99%	Yes
1997	237	65%	No
1998	328	90%	No
1999	326	89%	No
2001	267	73%	No

Latest Records

Latest records at Tonala (Smn)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 2001	Tonala (Smn), MX	daily high min (Tie)	26.7 C (80.1 F)	tie	18 years	3 of 100 (Routine)
13 September 2001	Tonala (Smn), MX	daily high min	27.8 C (82.0 F)	1.1 C (2.0 F)	19 years	18 of 100 (Routine)
8 September 2001	Tonala (Smn), MX	daily high min (Tie)	26.7 C (80.1 F)	tie	4 years	2 of 100 (Routine)
7 September 2001	Tonala (Smn), MX	daily high min	27.8 C (82.0 F)	1.1 C (2.0 F)	14 years	17 of 100 (Routine)
6 September 2001	Tonala (Smn), MX	daily high min (Tie)	27.8 C (82.0 F)	tie	14 years	3 of 100 (Routine)
4 September 2001	Tonala (Smn), MX	daily high min (Tie)	27.8 C (82.0 F)	tie	14 years	3 of 100 (Routine)
2 September 2001	Tonala (Smn), MX	daily high min (Tie)	27.8 C (82.0 F)	tie	19 years	3 of 100 (Routine)
1 September 2001	Tonala (Smn), MX	daily high min (Tie)	27.8 C (82.0 F)	tie	14 years	3 of 100 (Routine)
23 August 2001	Tonala (Smn), MX	daily rain	50.8 mm (2.0 in)	3.0 mm (0.12 in)	3 years	9 of 100 (Routine)
23 August 2001	Tonala (Smn), MX	daily high min (Tie)	27.8 C (82.0 F)	tie	42 years	5 of 100 (Routine)
22 August 2001	Tonala (Smn), MX	daily high min (Tie)	30.0 C (86.0 F)	tie	42 years	5 of 100 (Routine)
21 August 2001	Tonala (Smn), MX	monthly high min	30.6 C (87.1 F)	0.6 C (1.1 F)	79 years	43 of 100 (Notable)
21 August 2001	Tonala (Smn), MX	daily high max (Tie)	37.8 C (100.0 F)	tie	24 years	3 of 100 (Routine)
20 August 2001	Tonala (Smn), MX	daily high max	40.0 C (104.0 F)	1.1 C (2.0 F)	42 years	24 of 100 (Routine)
20 August 2001	Tonala (Smn), MX	monthly high min (Tie)	30.0 C (86.0 F)	tie	79 years	10 of 100 (Routine)
19 August 2001	Tonala (Smn), MX	monthly high min (Tie)	30.0 C (86.0 F)	tie	79 years	10 of 100 (Routine)
18 August 2001	Tonala (Smn), MX	daily high min	28.9 C (84.0 F)	1.1 C (2.0 F)	18 years	17 of 100 (Routine)
18 August 2001	Tonala (Smn), MX	daily high max (Tie)	38.9 C (102.0 F)	tie	42 years	5 of 100 (Routine)
15 August 2001	Tonala (Smn), MX	daily high min	28.9 C (84.0 F)	1.1 C (2.0 F)	14 years	16 of 100 (Routine)
4 August 2001	Tonala (Smn), MX	daily high min (Tie)	28.9 C (84.0 F)	tie	15 years	3 of 100 (Routine)

Climate Trend

37 complete years, 1929 to 1996

One stripe for each of 37 complete years at Tonala (Smn), 1929 to 1996. Blue stripes are years cooler than the station's own mean of 28.0 C (82.3 F); red stripes are warmer. The coolest year was 1968, at 25.9 C (78.6 F), and the warmest was 1987, at 30.5 C (86.9 F). The strongest colour marks a difference of 2.6 C (4.7 F).

Annual mean temperature at Tonala (Smn) as warming stripes, 1929 to 1996
Year	Annual mean temperature	Difference from the station mean
1929	27.1 C	-0.90 C
1930	27.6 C	-0.34 C
1931	27.7 C	-0.25 C
1933	27.1 C	-0.85 C
1934	27.7 C	-0.22 C
1935	27.6 C	-0.34 C
1936	27.9 C	-0.05 C
1937	27.6 C	-0.39 C
1938	27.1 C	-0.91 C
1954	26.7 C	-1.30 C
1959	27.9 C	-0.07 C
1960	27.7 C	-0.24 C
1961	27.9 C	-0.04 C
1962	28.3 C	+0.32 C
1963	26.5 C	-1.46 C
1964	26.4 C	-1.56 C
1965	26.3 C	-1.62 C
1966	26.3 C	-1.67 C
1967	26.4 C	-1.56 C
1968	25.9 C	-2.05 C
1969	26.7 C	-1.29 C
1970	26.2 C	-1.80 C
1971	27.8 C	-0.12 C
1973	27.0 C	-0.98 C
1974	28.6 C	+0.59 C
1975	28.9 C	+0.92 C
1976	29.1 C	+1.18 C
1977	29.4 C	+1.42 C
1980	29.1 C	+1.15 C
1981	29.1 C	+1.11 C
1982	29.5 C	+1.52 C
1983	30.2 C	+2.25 C
1984	29.6 C	+1.68 C
1985	29.4 C	+1.40 C
1986	30.1 C	+2.18 C
1987	30.5 C	+2.54 C
1996	29.6 C	+1.68 C

The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1929 to 1996. In Fahrenheit: 0.6 F (0.3 to 1.0) per decade. The slope is a straight line fitted to 37 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Tonala (Smn)
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.4 C (0.2 to 0.6) per decade	0.6 F (0.3 to 1.0) per decade	1929 to 1996	37	Rise
Mean daily maximum	0.3 C (0.1 to 0.6) per decade	0.6 F (0.2 to 1.0) per decade	1929 to 1996	37	Rise
Mean daily minimum	0.4 C (0.1 to 0.7) per decade	0.7 F (0.1 to 1.3) per decade	1929 to 1996	37	Rise

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

1922 to 2001

Yearly extremes at Tonala (Smn): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.9 C (111.0 F)	1960	38.9 C (102.0 F)	55
Coldest night (TNn)	11.7 C (53.1 F)	1963	16.7 C (62.1 F)	55
Wettest day (Rx1day)	406.9 mm (16.0 in)	1963	95.0 mm (3.7 in)	55
Wettest five days (Rx5day)	659.4 mm (26.0 in)	1963	206.2 mm (8.1 in)	55
Longest dry spell (CDD)	147 days	1988	81 days	55

Hottest day (TXx)

The hottest day of the year at Tonala (Smn), 1922 to 2001. The record is 43.9 C (111.0 F) in 1960, marked on the chart; the median year is 38.9 C (102.0 F).

Hottest day (TXx) at Tonala (Smn) by year
Year	Hottest day (TXx)
1922	37.8 C (100.0 F)
1923	36.7 C (98.1 F)
1924	37.8 C (100.0 F)
1926	38.9 C (102.0 F)
1927	36.7 C (98.1 F)
1928	37.8 C (100.0 F)
1929	36.7 C (98.1 F)
1930	37.8 C (100.0 F)
1931	38.9 C (102.0 F)
1933	38.9 C (102.0 F)
1934	38.9 C (102.0 F)
1935	38.3 C (100.9 F)
1936	38.9 C (102.0 F)
1937	38.9 C (102.0 F)
1938	38.9 C (102.0 F)
1954	40.0 C (104.0 F)
1959	42.8 C (109.0 F)
1960	43.9 C (111.0 F)
1961	42.8 C (109.0 F)
1962	41.7 C (107.1 F)
1963	38.9 C (102.0 F)
1964	38.9 C (102.0 F)
1965	38.9 C (102.0 F)
1966	38.9 C (102.0 F)
1967	38.9 C (102.0 F)
1968	38.9 C (102.0 F)
1969	40.6 C (105.1 F)
1970	36.7 C (98.1 F)
1971	40.6 C (105.1 F)
1972	37.8 C (100.0 F)
1973	38.9 C (102.0 F)
1974	42.8 C (109.0 F)
1975	41.7 C (107.1 F)
1976	41.7 C (107.1 F)
1977	42.8 C (109.0 F)
1978	43.9 C (111.0 F)
1979	41.7 C (107.1 F)
1980	40.6 C (105.1 F)
1981	42.8 C (109.0 F)
1982	36.7 C (98.1 F)
1983	37.8 C (100.0 F)
1984	36.7 C (98.1 F)
1985	36.7 C (98.1 F)
1986	38.9 C (102.0 F)
1987	40.0 C (104.0 F)
1988	37.8 C (100.0 F)
1989	36.7 C (98.1 F)
1990	35.6 C (96.1 F)
1991	35.6 C (96.1 F)
1992	42.8 C (109.0 F)
1996	37.8 C (100.0 F)
1997	38.9 C (102.0 F)
1998	38.9 C (102.0 F)
1999	37.8 C (100.0 F)
2001	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at Tonala (Smn), 1922 to 2001. The record is 11.7 C (53.1 F) in 1963, marked on the chart; the median year is 16.7 C (62.1 F).

Coldest night (TNn) at Tonala (Smn) by year
Year	Coldest night (TNn)
1922	13.9 C (57.0 F)
1923	18.9 C (66.0 F)
1924	16.7 C (62.1 F)
1926	19.4 C (66.9 F)
1927	20.6 C (69.1 F)
1928	18.9 C (66.0 F)
1929	16.7 C (62.1 F)
1930	15.6 C (60.1 F)
1931	16.7 C (62.1 F)
1933	17.8 C (64.0 F)
1934	16.7 C (62.1 F)
1935	12.8 C (55.0 F)
1936	16.7 C (62.1 F)
1937	17.8 C (64.0 F)
1938	16.7 C (62.1 F)
1954	15.6 C (60.1 F)
1959	13.9 C (57.0 F)
1960	12.8 C (55.0 F)
1961	17.8 C (64.0 F)
1962	16.7 C (62.1 F)
1963	11.7 C (53.1 F)
1964	15.0 C (59.0 F)
1965	15.0 C (59.0 F)
1966	12.8 C (55.0 F)
1967	13.9 C (57.0 F)
1968	13.9 C (57.0 F)
1969	15.0 C (59.0 F)
1970	15.6 C (60.1 F)
1971	15.0 C (59.0 F)
1972	18.9 C (66.0 F)
1973	15.6 C (60.1 F)
1974	15.6 C (60.1 F)
1975	16.7 C (62.1 F)
1976	16.7 C (62.1 F)
1977	18.9 C (66.0 F)
1978	16.7 C (62.1 F)
1979	16.7 C (62.1 F)
1980	18.9 C (66.0 F)
1981	15.0 C (59.0 F)
1982	22.8 C (73.0 F)
1983	20.6 C (69.1 F)
1984	21.7 C (71.1 F)
1985	21.7 C (71.1 F)
1986	21.7 C (71.1 F)
1987	20.0 C (68.0 F)
1988	22.8 C (73.0 F)
1989	20.0 C (68.0 F)
1990	22.8 C (73.0 F)
1991	22.8 C (73.0 F)
1992	20.6 C (69.1 F)
1996	15.6 C (60.1 F)
1997	22.8 C (73.0 F)
1998	22.8 C (73.0 F)
1999	20.6 C (69.1 F)
2001	23.9 C (75.0 F)

Wettest day (Rx1day)

The wettest day of the year at Tonala (Smn), 1922 to 2001. The record is 406.9 mm (16.0 in) in 1963, marked on the chart; the median year is 95.0 mm (3.7 in).

Wettest day (Rx1day) at Tonala (Smn) by year
Year	Wettest day (Rx1day)
1922	130.8 mm (5.1 in)
1923	137.4 mm (5.4 in)
1924	54.9 mm (2.2 in)
1926	49.8 mm (2.0 in)
1927	22.9 mm (0.9 in)
1928	82.3 mm (3.2 in)
1929	83.8 mm (3.3 in)
1930	131.8 mm (5.2 in)
1931	83.3 mm (3.3 in)
1933	71.9 mm (2.8 in)
1934	169.9 mm (6.7 in)
1935	95.0 mm (3.7 in)
1936	72.9 mm (2.9 in)
1937	89.9 mm (3.5 in)
1938	79.8 mm (3.1 in)
1954	69.9 mm (2.8 in)
1959	83.8 mm (3.3 in)
1960	89.9 mm (3.5 in)
1961	161.8 mm (6.4 in)
1962	156.0 mm (6.1 in)
1963	406.9 mm (16.0 in)
1964	142.0 mm (5.6 in)
1965	97.8 mm (3.9 in)
1966	122.9 mm (4.8 in)
1967	182.9 mm (7.2 in)
1968	136.9 mm (5.4 in)
1969	149.9 mm (5.9 in)
1970	101.9 mm (4.0 in)
1971	65.8 mm (2.6 in)
1972	126.0 mm (5.0 in)
1973	184.9 mm (7.3 in)
1974	147.3 mm (5.8 in)
1975	70.9 mm (2.8 in)
1976	67.8 mm (2.7 in)
1977	83.8 mm (3.3 in)
1978	94.0 mm (3.7 in)
1979	97.8 mm (3.9 in)
1980	270.8 mm (10.7 in)
1981	202.9 mm (8.0 in)
1982	111.8 mm (4.4 in)
1983	68.8 mm (2.7 in)
1984	175.8 mm (6.9 in)
1985	95.8 mm (3.8 in)
1986	112.3 mm (4.4 in)
1987	70.9 mm (2.8 in)
1988	206.8 mm (8.1 in)
1989	206.8 mm (8.1 in)
1990	42.9 mm (1.7 in)
1991	64.8 mm (2.6 in)
1992	72.9 mm (2.9 in)
1996	88.9 mm (3.5 in)
1997	90.9 mm (3.6 in)
1998	71.9 mm (2.8 in)
1999	95.8 mm (3.8 in)
2001	59.9 mm (2.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Tonala (Smn), 1922 to 2001. The record is 659.4 mm (26.0 in) in 1963, marked on the chart; the median year is 206.2 mm (8.1 in).

Wettest five days (Rx5day) at Tonala (Smn) by year
Year	Wettest five days (Rx5day)
1922	233.8 mm (9.2 in)
1923	304.5 mm (12.0 in)
1924	113.6 mm (4.5 in)
1926	118.4 mm (4.7 in)
1927	38.6 mm (1.5 in)
1928	105.4 mm (4.1 in)
1929	225.3 mm (8.9 in)
1930	327.2 mm (12.9 in)
1931	263.9 mm (10.4 in)
1933	179.7 mm (7.1 in)
1934	316.5 mm (12.5 in)
1935	174.8 mm (6.9 in)
1936	224.5 mm (8.8 in)
1937	208.2 mm (8.2 in)
1938	179.2 mm (7.1 in)
1954	152.4 mm (6.0 in)
1959	213.4 mm (8.4 in)
1960	165.5 mm (6.5 in)
1961	277.3 mm (10.9 in)
1962	225.7 mm (8.9 in)
1963	659.4 mm (26.0 in)
1964	194.5 mm (7.7 in)
1965	164.2 mm (6.5 in)
1966	218.1 mm (8.6 in)
1967	334.6 mm (13.2 in)
1968	291.6 mm (11.5 in)
1969	227.3 mm (8.9 in)
1970	243.3 mm (9.6 in)
1971	129.3 mm (5.1 in)
1972	235.2 mm (9.3 in)
1973	339.7 mm (13.4 in)
1974	237.0 mm (9.3 in)
1975	141.5 mm (5.6 in)
1976	133.3 mm (5.2 in)
1977	186.5 mm (7.3 in)
1978	196.6 mm (7.7 in)
1979	206.2 mm (8.1 in)
1980	441.5 mm (17.4 in)
1981	286.5 mm (11.3 in)
1982	207.4 mm (8.2 in)
1983	129.5 mm (5.1 in)
1984	356.2 mm (14.0 in)
1985	165.2 mm (6.5 in)
1986	186.0 mm (7.3 in)
1987	164.1 mm (6.5 in)
1988	480.1 mm (18.9 in)
1989	462.4 mm (18.2 in)
1990	84.3 mm (3.3 in)
1991	136.2 mm (5.4 in)
1992	142.5 mm (5.6 in)
1996	180.6 mm (7.1 in)
1997	142.5 mm (5.6 in)
1998	210.3 mm (8.3 in)
1999	186.0 mm (7.3 in)
2001	130.9 mm (5.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Tonala (Smn), 1922 to 2001. The record is 147 days in 1988, marked on the chart; the median year is 81 days.

Longest dry spell (CDD) at Tonala (Smn) by year
Year	Longest dry spell (CDD)
1922	59 days
1923	76 days
1924	89 days
1926	124 days
1927	13 days
1928	122 days
1929	77 days
1930	63 days
1931	74 days
1933	125 days
1934	40 days
1935	83 days
1936	120 days
1937	56 days
1938	61 days
1954	96 days
1959	62 days
1960	106 days
1961	117 days
1962	81 days
1963	51 days
1964	105 days
1965	88 days
1966	73 days
1967	80 days
1968	66 days
1969	112 days
1970	145 days
1971	92 days
1972	88 days
1973	95 days
1974	56 days
1975	60 days
1976	114 days
1977	92 days
1978	44 days
1979	82 days
1980	77 days
1981	115 days
1982	58 days
1983	71 days
1984	128 days
1985	74 days
1986	116 days
1987	95 days
1988	147 days
1989	47 days
1990	51 days
1991	59 days
1992	17 days
1996	101 days
1997	91 days
1998	108 days
1999	44 days
2001	63 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

46 years, 1922 to 1999

A day with at least 104.5 mm (4.1 in) of rain is expected about once in 2 years. A day with at least 383.3 mm (15.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Tonala (Smn): the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	104.5 mm (4.1 in)
5 years	151.6 mm (6.0 in)
10 years	191.6 mm (7.5 in)
25 years	255.0 mm (10.0 in)
50 years	313.4 mm (12.3 in)	Longer than the 46 years of record
100 years	383.3 mm (15.1 in)	Longer than the 46 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, 46 years of values from 1922 to 1999.

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: 406.9 mm (16.0 in) in 1963; 270.8 mm (10.7 in) in 1980; 206.8 mm (8.1 in) in 1989.

Download the Data

Data for Tonala (Smn) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Tonala (Smn) 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

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