Roi Et Weather Records (TH000048405)

Record envelope, standing records and threshold days for Roi Et (TH000048405), Thailand, with 75 years of record.

Key Facts for Roi Et

Roi Et (TH000048405) is a weather station in Thailand at 16.05 latitude and 103.68 longitude, 142 m (466 ft) above sea level.
The station reports from 1951 to 2025, 75 years of record.
1,464 records set at Roi Et still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Roi Et set a daily record high maximum temperature of 35.1 C (95.2 F) on 21 August 2025.

About the Station

Location: Thailand, 16.05 latitude, 103.68 longitude.
Elevation: 142 m (466 ft).
Period of record: 1951 to 2025, 75 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

14 days at or beyond a record

The band shows the record high and record low for each calendar day at Roi Et. The lines show the 2026 daily maximum and minimum. 14 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Roi Et, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	37.3 C (99.1 F)	6.3 C (43.3 F)	36.0 C (96.8 F)	11.6 C (52.9 F)
Feb	38.7 C (101.7 F)	9.8 C (49.6 F)	36.8 C (98.2 F)	15.1 C (59.2 F)
Mar	40.7 C (105.3 F)	10.9 C (51.6 F)	39.3 C (102.7 F)	17.0 C (62.6 F)
Apr	43.3 C (109.9 F)	14.0 C (57.2 F)	39.7 C (103.5 F)	19.1 C (66.4 F)
May	42.7 C (108.9 F)	17.7 C (63.9 F)	38.6 C (101.5 F)	23.0 C (73.4 F)
Jun	43.4 C (110.1 F)	19.7 C (67.5 F)	35.7 C (96.3 F)	22.8 C (73.0 F)
Jul	39.6 C (103.3 F)	21.2 C (70.2 F)	35.2 C (95.4 F)	23.2 C (73.8 F)
Aug	40.8 C (105.4 F)	21.1 C (70.0 F)	36.5 C (97.7 F)	21.7 C (71.1 F)
Sep	37.1 C (98.8 F)	20.0 C (68.0 F)	n/a	n/a
Oct	38.2 C (100.8 F)	13.4 C (56.1 F)	n/a	n/a
Nov	36.6 C (97.9 F)	11.4 C (52.5 F)	n/a	n/a
Dec	35.8 C (96.4 F)	6.7 C (44.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Roi Et still stand. 2016 holds the most, with 55.

Standing records at Roi Et by the year they were set
Year set	Standing records
1953	8
1954	8
1955	27
1956	21
1957	29
1958	21
1959	19
1960	15
1961	21
1962	20
1963	27
1964	17
1965	8
1966	25
1967	24
1968	15
1969	17
1970	22
1971	35
1972	9
1973	15
1974	21
1975	26
1976	18
1977	27
1978	18
1979	12
1980	8
1981	6
1982	11
1983	11
1984	9
1985	12
1986	14
1987	13
1988	14
1989	14
1990	5
1991	11
1992	14
1993	11
1994	21
1995	3
1996	12
1997	18
1998	30
1999	21
2000	21
2001	19
2002	22
2003	13
2004	16
2005	16
2006	23
2007	20
2008	12
2009	20
2010	23
2011	21
2012	28
2013	19
2014	15
2015	54
2016	55
2017	24
2018	19
2019	33
2020	37
2021	24
2022	27
2023	51
2024	54
2025	15

All-Time Record Progression

7 new records

7 all-time records were set at Roi Et between 21 June 1997 and 2 May 2024. Each dot is a new record.

When Roi Et set new all-time records
Date	Kind	Detail
1997-06-21	Record high maximum temperature	Record high maximum temperature 43.4 C (110.1 F)
2010-05-07	Record high minimum temperature	Record high minimum temperature 29.6 C (85.3 F)
2016-01-24	Record low maximum temperature	Record low maximum temperature 15.1 C (59.2 F)
2016-04-15	Record high minimum temperature	Record high minimum temperature 30.2 C (86.4 F)
2019-08-30	Record daily precipitation	Record daily precipitation 318.3 mm (12.5 in)
2024-04-26	Record high minimum temperature	Record high minimum temperature 30.5 C (86.9 F)
2024-05-02	Record high minimum temperature	Record high minimum temperature 31.2 C (88.2 F)

Wettest Day of Each Month

Aug: 318.3 mm (12.5 in)

The wettest day on record for each calendar month at Roi Et. The most was 318.3 mm (12.5 in) on 30 August 2019.

Record daily precipitation for each month at Roi Et
Month	Record daily precipitation (mm)	Date
Jan	65.5 mm (2.6 in)	20 January 2012
Feb	65.6 mm (2.6 in)	25 February 1981
Mar	82.3 mm (3.2 in)	31 March 2002
Apr	94.0 mm (3.7 in)	4 April 2008
May	118.0 mm (4.6 in)	31 May 1970
Jun	198.1 mm (7.8 in)	24 June 2001
Jul	149.9 mm (5.9 in)	26 July 2017
Aug	318.3 mm (12.5 in)	30 August 2019
Sep	242.3 mm (9.5 in)	22 September 1964
Oct	118.4 mm (4.7 in)	4 October 2006
Nov	74.9 mm (2.9 in)	13 November 2001
Dec	21.9 mm (0.9 in)	3 December 1975

Period of Record Coverage

1953 to 2025

73 years of record at Roi Et, 1953 to 2025. 14 years have data for under 90 percent of days and are left out of rankings: 1953, 1954, 1959, 1960, 1986, 1988, 2005, 2017 and others.

Days with data per year at Roi Et
Year	Days with data	Share of year	Complete
1953	55	15%	No
1954	89	24%	No
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	325	89%	No
1960	246	67%	No
1961	365	100%	Yes
1962	365	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	364	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	364	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	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	326	89%	No
1987	339	93%	Yes
1988	298	81%	No
1989	339	93%	Yes
1990	350	96%	Yes
1991	350	96%	Yes
1992	344	94%	Yes
1993	351	96%	Yes
1994	352	96%	Yes
1995	347	95%	Yes
1996	357	98%	Yes
1997	351	96%	Yes
1998	349	96%	Yes
1999	342	94%	Yes
2000	341	93%	Yes
2001	347	95%	Yes
2002	349	96%	Yes
2003	353	97%	Yes
2004	358	98%	Yes
2005	305	84%	No
2006	359	98%	Yes
2007	360	99%	Yes
2008	365	100%	Yes
2009	365	100%	Yes
2010	365	100%	Yes
2011	364	100%	Yes
2012	365	100%	Yes
2013	361	99%	Yes
2014	365	100%	Yes
2015	362	99%	Yes
2016	353	96%	Yes
2017	328	90%	No
2018	215	59%	No
2019	236	65%	No
2020	322	88%	No
2021	312	85%	No
2022	337	92%	Yes
2023	336	92%	Yes
2024	312	85%	No
2025	222	61%	No

Latest Records

Latest records at Roi Et
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 2025	Roi Et, TH	daily high max	35.1 C (95.2 F)	0.1 C (0.2 F)	12 years	10 of 100 (Routine)
14 August 2025	Roi Et, TH	daily low min	21.7 C (71.1 F)	0.6 C (1.1 F)	54 years	28 of 100 (Routine)
13 August 2025	Roi Et, TH	daily low min	21.7 C (71.1 F)	0.3 C (0.5 F)	68 years	29 of 100 (Routine)
10 August 2025	Roi Et, TH	daily high max	36.2 C (97.2 F)	0.4 C (0.7 F)	4 years	10 of 100 (Routine)
9 August 2025	Roi Et, TH	daily high max	36.5 C (97.7 F)	0.1 C (0.2 F)	39 years	18 of 100 (Routine)
5 August 2025	Roi Et, TH	daily high max	36.4 C (97.5 F)	1.4 C (2.5 F)	14 years	18 of 100 (Routine)
4 August 2025	Roi Et, TH	daily high max	36.2 C (97.2 F)	1.5 C (2.7 F)	67 years	34 of 100 (Routine)
1 August 2025	Roi Et, TH	daily high max	35.3 C (95.5 F)	0.5 C (0.9 F)	39 years	20 of 100 (Routine)
11 June 2025	Roi Et, TH	daily rain	44.7 mm (1.8 in)	7.1 mm (0.28 in)	52 years	25 of 100 (Routine)
10 June 2025	Roi Et, TH	daily rain	102.1 mm (4.0 in)	35.6 mm (1.4 in)	52 years	41 of 100 (Notable)
25 May 2025	Roi Et, TH	daily rain	58.9 mm (2.3 in)	3.8 mm (0.15 in)	27 years	17 of 100 (Routine)
9 May 2025	Roi Et, TH	daily rain	29.7 mm (1.2 in)	1.6 mm (0.06 in)	63 years	25 of 100 (Routine)
20 March 2025	Roi Et, TH	daily low min	17.0 C (62.6 F)	0.6 C (1.1 F)	68 years	29 of 100 (Routine)
20 March 2025	Roi Et, TH	daily low max	29.1 C (84.4 F)	0.7 C (1.3 F)	48 years	23 of 100 (Routine)
4 March 2025	Roi Et, TH	daily high max	38.3 C (100.9 F)	0.1 C (0.2 F)	15 years	11 of 100 (Routine)
3 March 2025	Roi Et, TH	daily high max	39.0 C (102.2 F)	0.1 C (0.2 F)	15 years	11 of 100 (Routine)
2 March 2025	Roi Et, TH	daily high max	39.3 C (102.7 F)	0.1 C (0.2 F)	52 years	22 of 100 (Routine)
2 February 2025	Roi Et, TH	daily high max	36.7 C (98.1 F)	0.4 C (0.7 F)	1 year	8 of 100 (Routine)
25 January 2025	Roi Et, TH	daily high max	36.0 C (96.8 F)	0.3 C (0.5 F)	24 years	15 of 100 (Routine)
16 November 2024	Roi Et, TH	daily high max	36.3 C (97.3 F)	1.1 C (2.0 F)	7 years	13 of 100 (Routine)

Climate Trend

40 complete years, 1955 to 2015

One stripe for each of 40 complete years at Roi Et, 1955 to 2015. Blue stripes are years cooler than the station's own mean of 27.1 C (80.8 F); red stripes are warmer. The coolest year was 1971, at 26.1 C (79.0 F), and the warmest was 2015, at 28.5 C (83.3 F). The strongest colour marks a difference of 1.4 C (2.5 F).

Annual mean temperature at Roi Et as warming stripes, 1955 to 2015
Year	Annual mean temperature	Difference from the station mean
1955	26.9 C	-0.27 C
1956	26.6 C	-0.51 C
1957	27.1 C	-0.05 C
1958	27.3 C	+0.12 C
1961	27.0 C	-0.17 C
1962	26.6 C	-0.57 C
1963	26.6 C	-0.52 C
1965	27.2 C	+0.02 C
1966	27.5 C	+0.37 C
1967	26.6 C	-0.49 C
1968	26.9 C	-0.26 C
1969	27.1 C	-0.03 C
1970	27.0 C	-0.13 C
1971	26.1 C	-1.04 C
1972	26.9 C	-0.24 C
1973	27.3 C	+0.14 C
1974	26.6 C	-0.56 C
1975	26.7 C	-0.39 C
1976	26.6 C	-0.57 C
1977	27.0 C	-0.18 C
1978	27.0 C	-0.11 C
1979	27.3 C	+0.13 C
1980	27.3 C	+0.16 C
1992	27.1 C	-0.03 C
1993	26.9 C	-0.22 C
1996	26.8 C	-0.35 C
1998	28.3 C	+1.15 C
1999	27.0 C	-0.17 C
2000	27.2 C	+0.03 C
2001	27.5 C	+0.35 C
2002	27.6 C	+0.51 C
2003	27.6 C	+0.43 C
2004	27.2 C	+0.07 C
2006	27.7 C	+0.57 C
2007	27.5 C	+0.37 C
2008	26.8 C	-0.35 C
2010	28.4 C	+1.24 C
2011	26.6 C	-0.50 C
2013	27.7 C	+0.61 C
2015	28.5 C	+1.37 C

The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1955 to 2015. In Fahrenheit: 0.3 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Roi Et
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.1 C (0.1 to 0.2) per decade	0.3 F (0.1 to 0.4) per decade	1955 to 2015	40	Rise
Mean daily maximum	0.12 C (0.03 to 0.21) per decade	0.21 F (0.05 to 0.38) per decade	1955 to 2015	40	Rise
Mean daily minimum	0.2 C (0.1 to 0.3) per decade	0.3 F (0.2 to 0.5) per decade	1955 to 2015	40	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

1951 to 2025

Yearly extremes at Roi Et: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.4 C (110.1 F)	1997	39.5 C (103.1 F)	73
Coldest night (TNn)	6.3 C (43.3 F)	1963	11.4 C (52.4 F)	68
Wettest day (Rx1day)	318.3 mm (12.5 in)	2019	94.2 mm (3.7 in)	75
Wettest five days (Rx5day)	550.0 mm (21.7 in)	2019	171.4 mm (6.7 in)	75
Longest dry spell (CDD)	103 days	2004	46 days	75

Hottest day (TXx)

The hottest day of the year at Roi Et, 1951 to 2025. The record is 43.4 C (110.1 F) in 1997, marked on the chart; the median year is 39.5 C (103.1 F).

Hottest day (TXx) at Roi Et by year
Year	Hottest day (TXx)
1951	n/a
1952	n/a
1953	38.8 C (101.8 F)
1954	33.3 C (91.9 F)
1955	40.3 C (104.5 F)
1956	39.2 C (102.6 F)
1957	41.0 C (105.8 F)
1958	41.5 C (106.7 F)
1959	39.0 C (102.2 F)
1960	39.5 C (103.1 F)
1961	39.0 C (102.2 F)
1962	39.0 C (102.2 F)
1963	39.9 C (103.8 F)
1964	38.6 C (101.5 F)
1965	37.7 C (99.9 F)
1966	38.8 C (101.8 F)
1967	40.0 C (104.0 F)
1968	38.0 C (100.4 F)
1969	39.5 C (103.1 F)
1970	38.8 C (101.8 F)
1971	38.7 C (101.7 F)
1972	38.7 C (101.7 F)
1973	40.8 C (105.4 F)
1974	38.7 C (101.7 F)
1975	40.5 C (104.9 F)
1976	37.7 C (99.9 F)
1977	39.3 C (102.7 F)
1978	39.0 C (102.2 F)
1979	39.4 C (102.9 F)
1980	40.2 C (104.4 F)
1981	38.3 C (100.9 F)
1982	38.6 C (101.5 F)
1983	41.2 C (106.2 F)
1984	39.9 C (103.8 F)
1985	40.0 C (104.0 F)
1986	40.0 C (104.0 F)
1987	39.8 C (103.6 F)
1988	39.8 C (103.6 F)
1989	40.8 C (105.4 F)
1990	39.0 C (102.2 F)
1991	40.9 C (105.6 F)
1992	40.2 C (104.4 F)
1993	39.7 C (103.5 F)
1994	38.6 C (101.5 F)
1995	39.1 C (102.4 F)
1996	39.3 C (102.7 F)
1997	43.4 C (110.1 F)
1998	41.0 C (105.8 F)
1999	39.0 C (102.2 F)
2000	38.7 C (101.7 F)
2001	43.0 C (109.4 F)
2002	39.0 C (102.2 F)
2003	39.8 C (103.6 F)
2004	40.1 C (104.2 F)
2005	40.0 C (104.0 F)
2006	39.0 C (102.2 F)
2007	40.7 C (105.3 F)
2008	38.0 C (100.4 F)
2009	39.3 C (102.7 F)
2010	41.2 C (106.2 F)
2011	39.2 C (102.6 F)
2012	38.8 C (101.8 F)
2013	41.0 C (105.8 F)
2014	39.5 C (103.1 F)
2015	42.2 C (108.0 F)
2016	42.3 C (108.1 F)
2017	39.2 C (102.6 F)
2018	40.0 C (104.0 F)
2019	40.8 C (105.4 F)
2020	40.8 C (105.4 F)
2021	39.0 C (102.2 F)
2022	39.7 C (103.5 F)
2023	41.1 C (106.0 F)
2024	43.3 C (109.9 F)
2025	39.7 C (103.5 F)

Coldest night (TNn)

The coldest night of the year at Roi Et, 1951 to 2025. The record is 6.3 C (43.3 F) in 1963, marked on the chart; the median year is 11.4 C (52.4 F).

Coldest night (TNn) at Roi Et by year
Year	Coldest night (TNn)
1951	n/a
1952	n/a
1953	10.7 C (51.3 F)
1954	9.8 C (49.6 F)
1955	6.8 C (44.2 F)
1956	10.1 C (50.2 F)
1957	11.0 C (51.8 F)
1958	12.0 C (53.6 F)
1959	11.2 C (52.2 F)
1960	7.8 C (46.0 F)
1961	9.3 C (48.7 F)
1962	9.0 C (48.2 F)
1963	6.3 C (43.3 F)
1964	10.0 C (50.0 F)
1965	11.3 C (52.3 F)
1966	11.2 C (52.2 F)
1967	8.0 C (46.4 F)
1968	11.4 C (52.5 F)
1969	11.5 C (52.7 F)
1970	11.4 C (52.5 F)
1971	8.7 C (47.7 F)
1972	10.7 C (51.3 F)
1973	8.5 C (47.3 F)
1974	7.8 C (46.0 F)
1975	7.0 C (44.6 F)
1976	9.4 C (48.9 F)
1977	11.7 C (53.1 F)
1978	12.8 C (55.0 F)
1979	11.9 C (53.4 F)
1980	12.3 C (54.1 F)
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	10.9 C (51.6 F)
1987	11.7 C (53.1 F)
1988	10.2 C (50.4 F)
1989	10.6 C (51.1 F)
1990	13.3 C (55.9 F)
1991	14.4 C (57.9 F)
1992	11.8 C (53.2 F)
1993	9.5 C (49.1 F)
1994	11.5 C (52.7 F)
1995	11.0 C (51.8 F)
1996	11.6 C (52.9 F)
1997	12.7 C (54.9 F)
1998	13.2 C (55.8 F)
1999	6.7 C (44.1 F)
2000	11.3 C (52.3 F)
2001	11.7 C (53.1 F)
2002	13.5 C (56.3 F)
2003	10.6 C (51.1 F)
2004	10.4 C (50.7 F)
2005	10.7 C (51.3 F)
2006	12.0 C (53.6 F)
2007	12.0 C (53.6 F)
2008	11.9 C (53.4 F)
2009	10.1 C (50.2 F)
2010	14.3 C (57.7 F)
2011	12.2 C (54.0 F)
2012	14.2 C (57.6 F)
2013	12.0 C (53.6 F)
2014	11.4 C (52.5 F)
2015	12.4 C (54.3 F)
2016	11.0 C (51.8 F)
2017	10.7 C (51.3 F)
2018	11.6 C (52.9 F)
2019	12.7 C (54.9 F)
2020	13.0 C (55.4 F)
2021	10.5 C (50.9 F)
2022	13.6 C (56.5 F)
2023	12.0 C (53.6 F)
2024	15.0 C (59.0 F)
2025	11.6 C (52.9 F)

Wettest day (Rx1day)

The wettest day of the year at Roi Et, 1951 to 2025. The record is 318.3 mm (12.5 in) in 2019, marked on the chart; the median year is 94.2 mm (3.7 in).

Wettest day (Rx1day) at Roi Et by year
Year	Wettest day (Rx1day)
1951	114.2 mm (4.5 in)
1952	72.7 mm (2.9 in)
1953	86.8 mm (3.4 in)
1954	73.7 mm (2.9 in)
1955	140.6 mm (5.5 in)
1956	86.4 mm (3.4 in)
1957	65.5 mm (2.6 in)
1958	100.5 mm (4.0 in)
1959	87.0 mm (3.4 in)
1960	81.6 mm (3.2 in)
1961	95.6 mm (3.8 in)
1962	123.1 mm (4.8 in)
1963	140.2 mm (5.5 in)
1964	242.3 mm (9.5 in)
1965	135.0 mm (5.3 in)
1966	87.8 mm (3.5 in)
1967	108.1 mm (4.3 in)
1968	114.8 mm (4.5 in)
1969	58.8 mm (2.3 in)
1970	118.0 mm (4.6 in)
1971	95.5 mm (3.8 in)
1972	114.3 mm (4.5 in)
1973	85.0 mm (3.3 in)
1974	94.2 mm (3.7 in)
1975	89.6 mm (3.5 in)
1976	95.2 mm (3.7 in)
1977	178.7 mm (7.0 in)
1978	140.6 mm (5.5 in)
1979	75.6 mm (3.0 in)
1980	75.2 mm (3.0 in)
1981	105.6 mm (4.2 in)
1982	109.5 mm (4.3 in)
1983	173.6 mm (6.8 in)
1984	116.9 mm (4.6 in)
1985	131.9 mm (5.2 in)
1986	111.0 mm (4.4 in)
1987	108.0 mm (4.3 in)
1988	83.1 mm (3.3 in)
1989	119.9 mm (4.7 in)
1990	56.9 mm (2.2 in)
1991	69.1 mm (2.7 in)
1992	86.1 mm (3.4 in)
1993	80.0 mm (3.1 in)
1994	96.0 mm (3.8 in)
1995	87.1 mm (3.4 in)
1996	58.9 mm (2.3 in)
1997	87.9 mm (3.5 in)
1998	82.0 mm (3.2 in)
1999	24.9 mm (1.0 in)
2000	84.1 mm (3.3 in)
2001	198.1 mm (7.8 in)
2002	82.3 mm (3.2 in)
2003	86.6 mm (3.4 in)
2004	113.0 mm (4.4 in)
2005	76.2 mm (3.0 in)
2006	118.4 mm (4.7 in)
2007	85.9 mm (3.4 in)
2008	94.0 mm (3.7 in)
2009	76.5 mm (3.0 in)
2010	75.7 mm (3.0 in)
2011	82.8 mm (3.3 in)
2012	65.5 mm (2.6 in)
2013	116.3 mm (4.6 in)
2014	79.8 mm (3.1 in)
2015	101.6 mm (4.0 in)
2016	174.2 mm (6.9 in)
2017	149.9 mm (5.9 in)
2018	74.9 mm (2.9 in)
2019	318.3 mm (12.5 in)
2020	94.5 mm (3.7 in)
2021	66.8 mm (2.6 in)
2022	97.0 mm (3.8 in)
2023	103.4 mm (4.1 in)
2024	58.7 mm (2.3 in)
2025	102.1 mm (4.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Roi Et, 1951 to 2025. The record is 550.0 mm (21.7 in) in 2019, marked on the chart; the median year is 171.4 mm (6.7 in).

Wettest five days (Rx5day) at Roi Et by year
Year	Wettest five days (Rx5day)
1951	187.0 mm (7.4 in)
1952	159.7 mm (6.3 in)
1953	172.6 mm (6.8 in)
1954	146.6 mm (5.8 in)
1955	241.1 mm (9.5 in)
1956	171.4 mm (6.7 in)
1957	115.0 mm (4.5 in)
1958	195.9 mm (7.7 in)
1959	179.2 mm (7.1 in)
1960	202.2 mm (8.0 in)
1961	166.1 mm (6.5 in)
1962	160.1 mm (6.3 in)
1963	191.8 mm (7.6 in)
1964	339.4 mm (13.4 in)
1965	170.4 mm (6.7 in)
1966	181.4 mm (7.1 in)
1967	253.3 mm (10.0 in)
1968	282.1 mm (11.1 in)
1969	184.0 mm (7.2 in)
1970	159.8 mm (6.3 in)
1971	142.2 mm (5.6 in)
1972	133.1 mm (5.2 in)
1973	134.8 mm (5.3 in)
1974	211.9 mm (8.3 in)
1975	141.8 mm (5.6 in)
1976	173.8 mm (6.8 in)
1977	253.8 mm (10.0 in)
1978	199.7 mm (7.9 in)
1979	204.0 mm (8.0 in)
1980	139.5 mm (5.5 in)
1981	133.8 mm (5.3 in)
1982	211.3 mm (8.3 in)
1983	249.8 mm (9.8 in)
1984	169.4 mm (6.7 in)
1985	170.3 mm (6.7 in)
1986	115.7 mm (4.6 in)
1987	135.2 mm (5.3 in)
1988	140.0 mm (5.5 in)
1989	183.9 mm (7.2 in)
1990	101.9 mm (4.0 in)
1991	128.0 mm (5.0 in)
1992	151.6 mm (6.0 in)
1993	107.7 mm (4.2 in)
1994	149.0 mm (5.9 in)
1995	161.8 mm (6.4 in)
1996	101.9 mm (4.0 in)
1997	122.2 mm (4.8 in)
1998	182.1 mm (7.2 in)
1999	30.0 mm (1.2 in)
2000	258.1 mm (10.2 in)
2001	244.9 mm (9.6 in)
2002	155.7 mm (6.1 in)
2003	171.4 mm (6.7 in)
2004	251.4 mm (9.9 in)
2005	186.5 mm (7.3 in)
2006	198.9 mm (7.8 in)
2007	175.9 mm (6.9 in)
2008	252.3 mm (9.9 in)
2009	120.7 mm (4.8 in)
2010	110.5 mm (4.4 in)
2011	158.6 mm (6.2 in)
2012	156.0 mm (6.1 in)
2013	193.1 mm (7.6 in)
2014	182.4 mm (7.2 in)
2015	162.9 mm (6.4 in)
2016	252.8 mm (10.0 in)
2017	267.8 mm (10.5 in)
2018	175.0 mm (6.9 in)
2019	550.0 mm (21.7 in)
2020	182.7 mm (7.2 in)
2021	124.5 mm (4.9 in)
2022	140.9 mm (5.5 in)
2023	183.7 mm (7.2 in)
2024	124.7 mm (4.9 in)
2025	180.6 mm (7.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Roi Et, 1951 to 2025. The record is 103 days in 2004, marked on the chart; the median year is 46 days.

Longest dry spell (CDD) at Roi Et by year
Year	Longest dry spell (CDD)
1951	73 days
1952	62 days
1953	50 days
1954	81 days
1955	68 days
1956	64 days
1957	51 days
1958	72 days
1959	71 days
1960	37 days
1961	72 days
1962	66 days
1963	78 days
1964	45 days
1965	64 days
1966	35 days
1967	53 days
1968	76 days
1969	60 days
1970	86 days
1971	54 days
1972	34 days
1973	84 days
1974	48 days
1975	47 days
1976	53 days
1977	85 days
1978	56 days
1979	97 days
1980	63 days
1981	55 days
1982	46 days
1983	56 days
1984	58 days
1985	49 days
1986	10 days
1987	13 days
1988	57 days
1989	32 days
1990	46 days
1991	36 days
1992	55 days
1993	31 days
1994	23 days
1995	58 days
1996	70 days
1997	30 days
1998	25 days
1999	31 days
2000	13 days
2001	5 days
2002	13 days
2003	64 days
2004	103 days
2005	60 days
2006	3 days
2007	3 days
2008	3 days
2009	3 days
2010	4 days
2011	4 days
2012	3 days
2013	5 days
2014	4 days
2015	5 days
2016	5 days
2017	3 days
2018	5 days
2019	4 days
2020	3 days
2021	3 days
2022	4 days
2023	4 days
2024	5 days
2025	5 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

48 years, 1951 to 2004

A day with at least 94.7 mm (3.7 in) of rain is expected about once in 2 years. A day with at least 226.2 mm (8.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Roi Et: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	94.7 mm (3.7 in)
5 years	122.8 mm (4.8 in)
10 years	143.9 mm (5.7 in)
25 years	174.0 mm (6.9 in)
50 years	199.0 mm (7.8 in)	Longer than the 48 years of record
100 years	226.2 mm (8.9 in)	Longer than the 48 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, 48 years of values from 1951 to 2004.

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: 242.3 mm (9.5 in) in 1964; 178.7 mm (7.0 in) in 1977; 173.6 mm (6.8 in) in 1983.

Download the Data

Data for Roi Et standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Roi Et 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 2026-10-12 (12 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).