Tonichi Weather Records (MXN00026101)

Record envelope, standing records and threshold days for Tonichi (MXN00026101), Mexico, with 56 years of record.

Key Facts for Tonichi

Tonichi (MXN00026101) is a weather station in Mexico at 28.60 latitude and -109.57 longitude, 199 m (652 ft) above sea level.
The station reports from 1945 to 2000, 56 years of record.
1,464 records set at Tonichi still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Tonichi tied a daily record high maximum temperature of 33.9 C (93.0 F) on 21 January 2000.

About the Station

Location: Mexico, 28.60 latitude, -109.57 longitude.
Elevation: 199 m (652 ft).
Period of record: 1945 to 2000, 56 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 Tonichi. 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 Tonichi, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	38.9 C (102.0 F)	-5.0 C (23.0 F)	n/a	n/a
Feb	40.6 C (105.1 F)	0.0 C (32.0 F)	n/a	n/a
Mar	43.9 C (111.0 F)	0.6 C (33.1 F)	n/a	n/a
Apr	45.0 C (113.0 F)	3.9 C (39.0 F)	n/a	n/a
May	48.9 C (120.0 F)	5.6 C (42.1 F)	n/a	n/a
Jun	50.0 C (122.0 F)	11.7 C (53.1 F)	n/a	n/a
Jul	48.9 C (120.0 F)	12.8 C (55.0 F)	n/a	n/a
Aug	48.9 C (120.0 F)	13.9 C (57.0 F)	n/a	n/a
Sep	46.7 C (116.1 F)	11.7 C (53.1 F)	n/a	n/a
Oct	45.6 C (114.1 F)	5.0 C (41.0 F)	n/a	n/a
Nov	41.7 C (107.1 F)	0.6 C (33.1 F)	n/a	n/a
Dec	38.9 C (102.0 F)	0.0 C (32.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Tonichi still stand. 1952 holds the most, with 113.

Standing records at Tonichi by the year they were set
Year set	Standing records
1945	10
1946	26
1947	33
1948	47
1949	36
1950	21
1951	52
1952	113
1953	33
1954	27
1955	20
1956	36
1957	51
1958	34
1959	27
1960	28
1961	12
1962	29
1963	17
1964	28
1965	29
1966	20
1967	26
1968	29
1969	27
1970	23
1971	22
1972	21
1973	41
1974	15
1975	15
1976	21
1977	24
1978	29
1979	56
1980	57
1981	27
1982	20
1983	14
1984	20
1985	14
1986	31
1987	23
1988	15
1989	18
1990	9
1991	16
1992	7
1993	18
1994	8
1995	18
1996	23
1997	17
1998	23
1999	2
2000	6

All-Time Record Progression

1 new records

1 all-time records were set at Tonichi between 17 July 1986 and 17 July 1986. Each dot is a new record.

Wettest Day of Each Month

Jul: 209.8 mm (8.3 in)

The wettest day on record for each calendar month at Tonichi. The most was 209.8 mm (8.3 in) on 17 July 1986.

Record daily precipitation for each month at Tonichi
Month	Record daily precipitation (mm)	Date
Jan	76.5 mm (3.0 in)	17 January 1979
Feb	70.4 mm (2.8 in)	1 February 1986
Mar	39.9 mm (1.6 in)	3 March 1983
Apr	48.3 mm (1.9 in)	18 April 1952
May	42.4 mm (1.7 in)	16 May 1984
Jun	110.0 mm (4.3 in)	21 June 1950
Jul	209.8 mm (8.3 in)	17 July 1986
Aug	92.5 mm (3.6 in)	21 August 1995
Sep	90.4 mm (3.6 in)	8 September 1958
Oct	105.9 mm (4.2 in)	6 October 1985
Nov	65.3 mm (2.6 in)	26 November 1958
Dec	74.4 mm (2.9 in)	21 December 1965

Period of Record Coverage

1945 to 2000

56 years of record at Tonichi, 1945 to 2000. 11 years have data for under 90 percent of days and are left out of rankings: 1945, 1951, 1952, 1972, 1989, 1990, 1991, 1992 and others.

Days with data per year at Tonichi
Year	Days with data	Share of year	Complete
1945	182	50%	No
1946	362	99%	Yes
1947	365	100%	Yes
1948	363	99%	Yes
1949	361	99%	Yes
1950	359	98%	Yes
1951	265	73%	No
1952	246	67%	No
1953	364	100%	Yes
1954	362	99%	Yes
1955	362	99%	Yes
1956	365	100%	Yes
1957	364	100%	Yes
1958	364	100%	Yes
1959	365	100%	Yes
1960	365	100%	Yes
1961	364	100%	Yes
1962	364	100%	Yes
1963	365	100%	Yes
1964	365	100%	Yes
1965	364	100%	Yes
1966	334	92%	Yes
1967	365	100%	Yes
1968	335	92%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	364	100%	Yes
1972	285	78%	No
1973	362	99%	Yes
1974	365	100%	Yes
1975	331	91%	Yes
1976	358	98%	Yes
1977	354	97%	Yes
1978	362	99%	Yes
1979	332	91%	Yes
1980	364	99%	Yes
1981	358	98%	Yes
1982	359	98%	Yes
1983	364	100%	Yes
1984	364	99%	Yes
1985	363	99%	Yes
1986	355	97%	Yes
1987	361	99%	Yes
1988	366	100%	Yes
1989	210	58%	No
1990	236	65%	No
1991	270	74%	No
1992	187	51%	No
1993	341	93%	Yes
1994	361	99%	Yes
1995	356	98%	Yes
1996	361	99%	Yes
1997	331	91%	Yes
1998	210	58%	No
1999	62	17%	No
2000	31	8%	No

Latest Records

Latest records at Tonichi
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 January 2000	Tonichi, MX	daily high max (Tie)	33.9 C (93.0 F)	tie	49 years	4 of 100 (Routine)
20 January 2000	Tonichi, MX	daily high max	37.8 C (100.0 F)	3.9 C (7.0 F)	28 years	21 of 100 (Routine)
19 January 2000	Tonichi, MX	monthly high max	38.9 C (102.0 F)	1.1 C (2.0 F)	20 years	23 of 100 (Routine)
18 January 2000	Tonichi, MX	monthly high max (Tie)	37.8 C (100.0 F)	tie	19 years	5 of 100 (Routine)
17 January 2000	Tonichi, MX	daily high max	36.7 C (98.1 F)	1.1 C (2.0 F)	28 years	15 of 100 (Routine)
15 January 2000	Tonichi, MX	daily high max	35.0 C (95.0 F)	1.1 C (2.0 F)	38 years	18 of 100 (Routine)
15 January 2000	Tonichi, MX	daily low min	1.7 C (35.1 F)	1.1 C (2.0 F)	32 years	17 of 100 (Routine)
14 January 2000	Tonichi, MX	daily high max (Tie)	35.6 C (96.1 F)	tie	42 years	4 of 100 (Routine)
16 October 1999	Tonichi, MX	monthly high max (Tie)	45.6 C (114.1 F)	tie	22 years	5 of 100 (Routine)
14 October 1999	Tonichi, MX	daily high max (Tie)	45.0 C (113.0 F)	tie	0 years	1 of 100 (Routine)
13 October 1999	Tonichi, MX	daily high max (Tie)	45.0 C (113.0 F)	tie	26 years	3 of 100 (Routine)
11 October 1999	Tonichi, MX	daily high min (Tie)	25.6 C (78.1 F)	tie	44 years	4 of 100 (Routine)
10 October 1999	Tonichi, MX	monthly high min (Tie)	26.7 C (80.1 F)	tie	47 years	7 of 100 (Routine)
9 October 1999	Tonichi, MX	daily high max (Tie)	45.0 C (113.0 F)	tie	20 years	2 of 100 (Routine)
9 October 1999	Tonichi, MX	daily high min (Tie)	25.6 C (78.1 F)	tie	21 years	2 of 100 (Routine)
8 October 1999	Tonichi, MX	daily high min (Tie)	25.6 C (78.1 F)	tie	0 years	1 of 100 (Routine)
7 October 1999	Tonichi, MX	daily high min (Tie)	25.6 C (78.1 F)	tie	0 years	1 of 100 (Routine)
4 October 1999	Tonichi, MX	monthly high max (Tie)	45.6 C (114.1 F)	tie	21 years	5 of 100 (Routine)
27 October 1998	Tonichi, MX	daily high min	20.6 C (69.1 F)	1.2 C (2.2 F)	47 years	22 of 100 (Routine)
26 October 1998	Tonichi, MX	daily high min (Tie)	20.6 C (69.1 F)	tie	9 years	1 of 100 (Routine)

Climate Trend

39 complete years, 1946 to 1996

One stripe for each of 39 complete years at Tonichi, 1946 to 1996. Blue stripes are years cooler than the station's own mean of 25.3 C (77.6 F); red stripes are warmer. The coolest year was 1949, at 23.8 C (74.8 F), and the warmest was 1980, at 26.9 C (80.4 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Tonichi as warming stripes, 1946 to 1996
Year	Annual mean temperature	Difference from the station mean
1946	24.5 C	-0.78 C
1947	24.4 C	-0.89 C
1948	24.1 C	-1.22 C
1949	23.8 C	-1.57 C
1950	25.3 C	-0.05 C
1953	25.7 C	+0.41 C
1954	26.2 C	+0.85 C
1955	25.1 C	-0.21 C
1956	25.9 C	+0.56 C
1957	25.6 C	+0.30 C
1958	25.3 C	+0.02 C
1959	26.0 C	+0.68 C
1960	25.4 C	+0.09 C
1961	25.1 C	-0.18 C
1962	25.9 C	+0.58 C
1963	25.9 C	+0.62 C
1964	24.8 C	-0.54 C
1965	24.9 C	-0.39 C
1967	24.8 C	-0.57 C
1969	24.5 C	-0.81 C
1970	24.2 C	-1.16 C
1971	24.0 C	-1.33 C
1973	24.9 C	-0.43 C
1974	25.0 C	-0.37 C
1976	25.2 C	-0.09 C
1977	26.1 C	+0.74 C
1978	26.3 C	+0.99 C
1980	26.9 C	+1.56 C
1981	26.2 C	+0.83 C
1982	25.9 C	+0.56 C
1983	25.0 C	-0.37 C
1984	25.8 C	+0.46 C
1985	25.8 C	+0.50 C
1986	26.8 C	+1.48 C
1987	26.0 C	+0.72 C
1988	25.7 C	+0.35 C
1994	25.0 C	-0.29 C
1995	24.8 C	-0.56 C
1996	24.9 C	-0.45 C

The fitted trend in annual mean temperature here over 1946 to 1996 is 0.15 C (-0.01 to 0.32) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.27 F (-0.03 to 0.57) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Tonichi
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.15 C (-0.01 to 0.32) per decade	0.27 F (-0.03 to 0.57) per decade	1946 to 1996	39	Not clearly different from zero
Mean daily maximum	0.4 C (0.2 to 0.6) per decade	0.8 F (0.4 to 1.2) per decade	1946 to 1996	39	Rise
Mean daily minimum	-0.1 C (-0.3 to 0.1) per decade	-0.2 F (-0.6 to 0.1) per decade	1946 to 1996	39	Not 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

1945 to 2000

Yearly extremes at Tonichi: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	50.0 C (122.0 F)	1972	45.6 C (114.1 F)	56
Coldest night (TNn)	-5.0 C (23.0 F)	1971	1.7 C (35.1 F)	56
Wettest day (Rx1day)	209.8 mm (8.3 in)	1986	69.9 mm (2.8 in)	56
Wettest five days (Rx5day)	251.7 mm (9.9 in)	1986	94.0 mm (3.7 in)	56
Longest dry spell (CDD)	180 days	1996	67 days	56

Hottest day (TXx)

The hottest day of the year at Tonichi, 1945 to 2000. The record is 50.0 C (122.0 F) in 1972, marked on the chart; the median year is 45.6 C (114.1 F).

Hottest day (TXx) at Tonichi by year
Year	Hottest day (TXx)
1945	42.8 C (109.0 F)
1946	45.0 C (113.0 F)
1947	45.0 C (113.0 F)
1948	45.0 C (113.0 F)
1949	42.2 C (108.0 F)
1950	45.6 C (114.1 F)
1951	45.0 C (113.0 F)
1952	45.6 C (114.1 F)
1953	45.0 C (113.0 F)
1954	45.0 C (113.0 F)
1955	45.6 C (114.1 F)
1956	45.6 C (114.1 F)
1957	45.6 C (114.1 F)
1958	48.9 C (120.0 F)
1959	46.7 C (116.1 F)
1960	47.8 C (118.0 F)
1961	45.0 C (113.0 F)
1962	46.7 C (116.1 F)
1963	46.7 C (116.1 F)
1964	46.7 C (116.1 F)
1965	45.6 C (114.1 F)
1966	47.8 C (118.0 F)
1967	45.6 C (114.1 F)
1968	47.8 C (118.0 F)
1969	48.9 C (120.0 F)
1970	46.7 C (116.1 F)
1971	46.7 C (116.1 F)
1972	50.0 C (122.0 F)
1973	47.8 C (118.0 F)
1974	47.8 C (118.0 F)
1975	45.6 C (114.1 F)
1976	45.6 C (114.1 F)
1977	45.6 C (114.1 F)
1978	47.8 C (118.0 F)
1979	48.9 C (120.0 F)
1980	50.0 C (122.0 F)
1981	45.6 C (114.1 F)
1982	46.7 C (116.1 F)
1983	45.6 C (114.1 F)
1984	45.6 C (114.1 F)
1985	47.8 C (118.0 F)
1986	46.7 C (116.1 F)
1987	47.8 C (118.0 F)
1988	46.7 C (116.1 F)
1989	47.8 C (118.0 F)
1990	46.7 C (116.1 F)
1991	45.6 C (114.1 F)
1992	41.7 C (107.1 F)
1993	45.6 C (114.1 F)
1994	45.6 C (114.1 F)
1995	45.6 C (114.1 F)
1996	47.8 C (118.0 F)
1997	45.6 C (114.1 F)
1998	47.8 C (118.0 F)
1999	45.6 C (114.1 F)
2000	38.9 C (102.0 F)

Coldest night (TNn)

The coldest night of the year at Tonichi, 1945 to 2000. The record is -5.0 C (23.0 F) in 1971, marked on the chart; the median year is 1.7 C (35.1 F).

Coldest night (TNn) at Tonichi by year
Year	Coldest night (TNn)
1945	0.6 C (33.1 F)
1946	0.6 C (33.1 F)
1947	0.6 C (33.1 F)
1948	0.6 C (33.1 F)
1949	0.0 C (32.0 F)
1950	3.9 C (39.0 F)
1951	1.1 C (34.0 F)
1952	2.8 C (37.0 F)
1953	1.7 C (35.1 F)
1954	0.6 C (33.1 F)
1955	0.6 C (33.1 F)
1956	3.9 C (39.0 F)
1957	5.0 C (41.0 F)
1958	1.7 C (35.1 F)
1959	0.6 C (33.1 F)
1960	0.6 C (33.1 F)
1961	3.9 C (39.0 F)
1962	1.7 C (35.1 F)
1963	2.8 C (37.0 F)
1964	0.0 C (32.0 F)
1965	2.8 C (37.0 F)
1966	0.0 C (32.0 F)
1967	0.0 C (32.0 F)
1968	0.6 C (33.1 F)
1969	0.0 C (32.0 F)
1970	0.0 C (32.0 F)
1971	-5.0 C (23.0 F)
1972	0.6 C (33.1 F)
1973	0.0 C (32.0 F)
1974	0.6 C (33.1 F)
1975	1.7 C (35.1 F)
1976	2.8 C (37.0 F)
1977	2.8 C (37.0 F)
1978	5.0 C (41.0 F)
1979	2.8 C (37.0 F)
1980	3.9 C (39.0 F)
1981	3.9 C (39.0 F)
1982	3.9 C (39.0 F)
1983	2.8 C (37.0 F)
1984	5.0 C (41.0 F)
1985	2.8 C (37.0 F)
1986	5.6 C (42.1 F)
1987	0.6 C (33.1 F)
1988	0.0 C (32.0 F)
1989	0.6 C (33.1 F)
1990	3.9 C (39.0 F)
1991	0.6 C (33.1 F)
1992	3.9 C (39.0 F)
1993	5.0 C (41.0 F)
1994	1.7 C (35.1 F)
1995	2.8 C (37.0 F)
1996	2.8 C (37.0 F)
1997	1.7 C (35.1 F)
1998	5.6 C (42.1 F)
1999	2.8 C (37.0 F)
2000	1.7 C (35.1 F)

Wettest day (Rx1day)

The wettest day of the year at Tonichi, 1945 to 2000. The record is 209.8 mm (8.3 in) in 1986, marked on the chart; the median year is 69.9 mm (2.8 in).

Wettest day (Rx1day) at Tonichi by year
Year	Wettest day (Rx1day)
1945	74.9 mm (2.9 in)
1946	46.0 mm (1.8 in)
1947	70.9 mm (2.8 in)
1948	67.3 mm (2.6 in)
1949	55.4 mm (2.2 in)
1950	127.0 mm (5.0 in)
1951	61.5 mm (2.4 in)
1952	51.8 mm (2.0 in)
1953	53.3 mm (2.1 in)
1954	57.4 mm (2.3 in)
1955	43.9 mm (1.7 in)
1956	42.9 mm (1.7 in)
1957	58.9 mm (2.3 in)
1958	90.4 mm (3.6 in)
1959	45.0 mm (1.8 in)
1960	75.9 mm (3.0 in)
1961	69.9 mm (2.8 in)
1962	83.8 mm (3.3 in)
1963	68.8 mm (2.7 in)
1964	76.5 mm (3.0 in)
1965	74.4 mm (2.9 in)
1966	88.9 mm (3.5 in)
1967	52.8 mm (2.1 in)
1968	79.8 mm (3.1 in)
1969	84.3 mm (3.3 in)
1970	78.0 mm (3.1 in)
1971	47.0 mm (1.9 in)
1972	59.4 mm (2.3 in)
1973	69.9 mm (2.8 in)
1974	74.9 mm (2.9 in)
1975	65.3 mm (2.6 in)
1976	82.8 mm (3.3 in)
1977	103.9 mm (4.1 in)
1978	58.9 mm (2.3 in)
1979	76.5 mm (3.0 in)
1980	71.9 mm (2.8 in)
1981	59.9 mm (2.4 in)
1982	80.3 mm (3.2 in)
1983	85.9 mm (3.4 in)
1984	59.9 mm (2.4 in)
1985	105.9 mm (4.2 in)
1986	209.8 mm (8.3 in)
1987	78.0 mm (3.1 in)
1988	78.0 mm (3.1 in)
1989	70.9 mm (2.8 in)
1990	69.9 mm (2.8 in)
1991	65.8 mm (2.6 in)
1992	32.8 mm (1.3 in)
1993	55.9 mm (2.2 in)
1994	34.8 mm (1.4 in)
1995	92.5 mm (3.6 in)
1996	84.8 mm (3.3 in)
1997	49.8 mm (2.0 in)
1998	55.9 mm (2.2 in)
1999	5.8 mm (0.23 in)
2000	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at Tonichi, 1945 to 2000. The record is 251.7 mm (9.9 in) in 1986, marked on the chart; the median year is 94.0 mm (3.7 in).

Wettest five days (Rx5day) at Tonichi by year
Year	Wettest five days (Rx5day)
1945	135.6 mm (5.3 in)
1946	70.9 mm (2.8 in)
1947	100.6 mm (4.0 in)
1948	106.2 mm (4.2 in)
1949	86.7 mm (3.4 in)
1950	168.0 mm (6.6 in)
1951	66.3 mm (2.6 in)
1952	86.2 mm (3.4 in)
1953	97.8 mm (3.9 in)
1954	76.2 mm (3.0 in)
1955	77.8 mm (3.1 in)
1956	54.6 mm (2.1 in)
1957	87.9 mm (3.5 in)
1958	136.6 mm (5.4 in)
1959	70.7 mm (2.8 in)
1960	86.6 mm (3.4 in)
1961	95.8 mm (3.8 in)
1962	87.1 mm (3.4 in)
1963	90.4 mm (3.6 in)
1964	91.3 mm (3.6 in)
1965	152.9 mm (6.0 in)
1966	108.3 mm (4.3 in)
1967	120.9 mm (4.8 in)
1968	102.2 mm (4.0 in)
1969	88.4 mm (3.5 in)
1970	86.2 mm (3.4 in)
1971	85.1 mm (3.4 in)
1972	89.5 mm (3.5 in)
1973	103.4 mm (4.1 in)
1974	109.5 mm (4.3 in)
1975	113.6 mm (4.5 in)
1976	97.3 mm (3.8 in)
1977	116.1 mm (4.6 in)
1978	73.7 mm (2.9 in)
1979	85.4 mm (3.4 in)
1980	173.7 mm (6.8 in)
1981	93.7 mm (3.7 in)
1982	106.5 mm (4.2 in)
1983	94.3 mm (3.7 in)
1984	75.7 mm (3.0 in)
1985	111.2 mm (4.4 in)
1986	251.7 mm (9.9 in)
1987	103.6 mm (4.1 in)
1988	136.5 mm (5.4 in)
1989	176.2 mm (6.9 in)
1990	148.7 mm (5.9 in)
1991	83.6 mm (3.3 in)
1992	41.4 mm (1.6 in)
1993	105.7 mm (4.2 in)
1994	70.4 mm (2.8 in)
1995	119.4 mm (4.7 in)
1996	171.4 mm (6.7 in)
1997	73.1 mm (2.9 in)
1998	67.3 mm (2.6 in)
1999	5.8 mm (0.23 in)
2000	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at Tonichi, 1945 to 2000. The record is 180 days in 1996, marked on the chart; the median year is 67 days.

Longest dry spell (CDD) at Tonichi by year
Year	Longest dry spell (CDD)
1945	30 days
1946	32 days
1947	57 days
1948	58 days
1949	30 days
1950	60 days
1951	30 days
1952	59 days
1953	42 days
1954	109 days
1955	40 days
1956	60 days
1957	72 days
1958	31 days
1959	38 days
1960	80 days
1961	136 days
1962	103 days
1963	141 days
1964	99 days
1965	114 days
1966	92 days
1967	167 days
1968	59 days
1969	73 days
1970	91 days
1971	102 days
1972	56 days
1973	108 days
1974	86 days
1975	118 days
1976	98 days
1977	152 days
1978	74 days
1979	61 days
1980	78 days
1981	54 days
1982	170 days
1983	37 days
1984	67 days
1985	52 days
1986	83 days
1987	56 days
1988	121 days
1989	66 days
1990	33 days
1991	89 days
1992	57 days
1993	40 days
1994	170 days
1995	109 days
1996	180 days
1997	58 days
1998	41 days
1999	31 days
2000	31 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, 1946 to 1997

A day with at least 68.5 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 159.0 mm (6.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Tonichi: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	68.5 mm (2.7 in)
5 years	89.9 mm (3.5 in)
10 years	105.2 mm (4.1 in)
25 years	125.8 mm (5.0 in)
50 years	142.0 mm (5.6 in)	Longer than the 45 years of record
100 years	159.0 mm (6.3 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 1946 to 1997.

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: 209.8 mm (8.3 in) in 1986; 127.0 mm (5.0 in) in 1950; 105.9 mm (4.2 in) in 1985.

Download the Data

Data for Tonichi standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Tonichi 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).