Nan Weather Records (TH000048331)

Record envelope, standing records and threshold days for Nan (TH000048331), Thailand, with 35 years of record.

Key Facts for Nan

Nan (TH000048331) is a weather station in Thailand at 18.77 latitude and 100.77 longitude, 200 m (656 ft) above sea level.
The station reports from 1951 to 1985, 35 years of record.
1,464 records set at Nan still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Nan set a daily record precipitation of 5.3 mm (0.21 in) on 20 November 1985.

About the Station

Location: Thailand, 18.77 latitude, 100.77 longitude.
Elevation: 200 m (656 ft).
Period of record: 1951 to 1985, 35 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 Nan. 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 Nan, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	35.4 C (95.7 F)	3.5 C (38.3 F)	n/a	n/a
Feb	38.0 C (100.4 F)	7.0 C (44.6 F)	n/a	n/a
Mar	40.8 C (105.4 F)	9.9 C (49.8 F)	n/a	n/a
Apr	44.1 C (111.4 F)	14.2 C (57.6 F)	n/a	n/a
May	42.1 C (107.8 F)	19.0 C (66.2 F)	n/a	n/a
Jun	38.7 C (101.7 F)	21.2 C (70.2 F)	n/a	n/a
Jul	37.4 C (99.3 F)	21.2 C (70.2 F)	n/a	n/a
Aug	36.6 C (97.9 F)	21.0 C (69.8 F)	n/a	n/a
Sep	36.1 C (97.0 F)	18.8 C (65.8 F)	n/a	n/a
Oct	35.2 C (95.4 F)	12.1 C (53.8 F)	n/a	n/a
Nov	36.1 C (97.0 F)	7.6 C (45.7 F)	n/a	n/a
Dec	35.0 C (95.0 F)	4.8 C (40.6 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Nan still stand. 1959 holds the most, with 85.

Standing records at Nan by the year they were set
Year set	Standing records
1951	39
1952	36
1953	53
1954	27
1955	42
1956	38
1957	57
1958	74
1959	85
1960	76
1961	48
1962	22
1963	40
1964	24
1965	23
1966	55
1967	50
1968	39
1969	47
1970	43
1971	41
1972	58
1973	27
1974	49
1975	78
1976	28
1977	64
1978	30
1979	33
1980	44
1981	15
1982	18
1983	33
1984	11
1985	17

Wettest Day of Each Month

Sep: 189.7 mm (7.5 in)

The wettest day on record for each calendar month at Nan. The most was 189.7 mm (7.5 in) on 3 September 1980.

Record daily precipitation for each month at Nan
Month	Record daily precipitation (mm)	Date
Jan	43.4 mm (1.7 in)	25 January 1951
Feb	61.2 mm (2.4 in)	3 February 1965
Mar	57.0 mm (2.2 in)	7 March 1973
Apr	94.6 mm (3.7 in)	3 April 1957
May	98.8 mm (3.9 in)	1 May 1968
Jun	93.6 mm (3.7 in)	18 June 1969
Jul	155.2 mm (6.1 in)	5 July 1981
Aug	115.0 mm (4.5 in)	21 August 1961
Sep	189.7 mm (7.5 in)	3 September 1980
Oct	80.1 mm (3.2 in)	10 October 1978
Nov	45.8 mm (1.8 in)	26 November 1977
Dec	24.6 mm (1.0 in)	23 December 1961

Period of Record Coverage

1951 to 1985

35 years of record at Nan, 1951 to 1985. Every year has data for at least 90 percent of its days.

Days with data per year at Nan
Year	Days with data	Share of year	Complete
1951	364	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	363	99%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
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	334	92%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	363	99%	Yes
1972	366	100%	Yes
1973	364	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	364	100%	Yes
1979	365	100%	Yes
1980	365	100%	Yes
1981	364	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes

Latest Records

Latest records at Nan
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 November 1985	Nan, TH	daily rain	5.3 mm (0.21 in)	4.8 mm (0.19 in)	16 years	14 of 100 (Routine)
19 November 1985	Nan, TH	daily rain	30.1 mm (1.2 in)	29.5 mm (1.2 in)	20 years	49 of 100 (Notable)
17 November 1985	Nan, TH	daily low max	27.1 C (80.8 F)	0.1 C (0.2 F)	2 years	3 of 100 (Routine)
16 November 1985	Nan, TH	daily low max	22.6 C (72.7 F)	2.7 C (4.9 F)	10 years	18 of 100 (Routine)
16 November 1985	Nan, TH	daily rain	21.4 mm (0.8 in)	9.1 mm (0.36 in)	10 years	18 of 100 (Routine)
13 November 1985	Nan, TH	daily rain	2.3 mm (0.09 in)	0.5 mm (0.02 in)	4 years	4 of 100 (Routine)
22 October 1985	Nan, TH	daily low max	26.8 C (80.2 F)	2.2 C (4.0 F)	16 years	20 of 100 (Routine)
17 October 1985	Nan, TH	daily low max	25.8 C (78.4 F)	3.1 C (5.6 F)	12 years	23 of 100 (Routine)
30 September 1985	Nan, TH	daily rain	39.0 mm (1.5 in)	4.1 mm (0.16 in)	28 years	13 of 100 (Routine)
4 September 1985	Nan, TH	daily high max	34.6 C (94.3 F)	0.3 C (0.5 F)	22 years	10 of 100 (Routine)
15 August 1985	Nan, TH	daily low max	24.5 C (76.1 F)	2.3 C (4.1 F)	32 years	22 of 100 (Routine)
23 July 1985	Nan, TH	daily low max	27.1 C (80.8 F)	1.3 C (2.3 F)	11 years	11 of 100 (Routine)
8 July 1985	Nan, TH	daily low max	27.2 C (81.0 F)	0.4 C (0.7 F)	16 years	8 of 100 (Routine)
20 June 1985	Nan, TH	daily rain	41.1 mm (1.6 in)	20.4 mm (0.8 in)	28 years	26 of 100 (Routine)
19 May 1985	Nan, TH	daily high max	37.4 C (99.3 F)	0.2 C (0.4 F)	24 years	10 of 100 (Routine)
27 April 1985	Nan, TH	daily low max	30.8 C (87.4 F)	0.2 C (0.4 F)	24 years	10 of 100 (Routine)
21 April 1985	Nan, TH	daily low max	29.0 C (84.2 F)	3.7 C (6.7 F)	18 years	20 of 100 (Routine)
17 April 1985	Nan, TH	daily low max	29.0 C (84.2 F)	3.1 C (5.6 F)	4 years	14 of 100 (Routine)
16 April 1985	Nan, TH	daily rain	32.2 mm (1.3 in)	5.6 mm (0.22 in)	24 years	13 of 100 (Routine)
8 March 1985	Nan, TH	daily high max	38.5 C (101.3 F)	0.6 C (1.1 F)	16 years	9 of 100 (Routine)

Climate Trend

29 complete years, 1951 to 1980

One stripe for each of 29 complete years at Nan, 1951 to 1980. Blue stripes are years cooler than the station's own mean of 26.3 C (79.4 F); red stripes are warmer. The coolest year was 1971, at 25.6 C (78.0 F), and the warmest was 1966, at 27.1 C (80.7 F). The strongest colour marks a difference of 0.8 C (1.4 F).

Annual mean temperature at Nan as warming stripes, 1951 to 1980
Year	Annual mean temperature	Difference from the station mean
1951	26.1 C	-0.23 C
1952	26.4 C	+0.12 C
1953	26.7 C	+0.35 C
1954	26.6 C	+0.28 C
1955	25.8 C	-0.50 C
1956	26.3 C	-0.05 C
1957	26.6 C	+0.31 C
1958	26.5 C	+0.18 C
1959	26.8 C	+0.50 C
1960	26.8 C	+0.45 C
1961	26.3 C	+0.02 C
1962	26.1 C	-0.22 C
1963	25.9 C	-0.39 C
1964	26.1 C	-0.21 C
1965	26.3 C	-0.01 C
1966	27.1 C	+0.74 C
1968	26.2 C	-0.08 C
1969	26.6 C	+0.24 C
1970	26.3 C	+0.01 C
1971	25.6 C	-0.74 C
1972	26.3 C	-0.04 C
1973	26.2 C	-0.15 C
1974	25.8 C	-0.47 C
1975	26.4 C	+0.05 C
1976	25.8 C	-0.48 C
1977	26.2 C	-0.08 C
1978	26.3 C	+0.01 C
1979	26.7 C	+0.35 C
1980	26.2 C	-0.08 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

1951 to 1985

Yearly extremes at Nan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	44.1 C (111.4 F)	1959	40.5 C (104.9 F)	35
Coldest night (TNn)	3.5 C (38.3 F)	1974	7.6 C (45.7 F)	30
Wettest day (Rx1day)	189.7 mm (7.5 in)	1980	77.6 mm (3.1 in)	35
Wettest five days (Rx5day)	323.9 mm (12.8 in)	1980	157.6 mm (6.2 in)	35
Longest dry spell (CDD)	85 days	1982	53 days	35

Hottest day (TXx)

The hottest day of the year at Nan, 1951 to 1985. The record is 44.1 C (111.4 F) in 1959, marked on the chart; the median year is 40.5 C (104.9 F).

Hottest day (TXx) at Nan by year
Year	Hottest day (TXx)
1951	41.6 C (106.9 F)
1952	39.2 C (102.6 F)
1953	40.6 C (105.1 F)
1954	40.6 C (105.1 F)
1955	39.2 C (102.6 F)
1956	40.3 C (104.5 F)
1957	40.5 C (104.9 F)
1958	42.0 C (107.6 F)
1959	44.1 C (111.4 F)
1960	43.2 C (109.8 F)
1961	39.6 C (103.3 F)
1962	39.8 C (103.6 F)
1963	41.8 C (107.2 F)
1964	39.6 C (103.3 F)
1965	39.5 C (103.1 F)
1966	41.7 C (107.1 F)
1967	40.8 C (105.4 F)
1968	38.7 C (101.7 F)
1969	42.0 C (107.6 F)
1970	39.7 C (103.5 F)
1971	38.4 C (101.1 F)
1972	41.2 C (106.2 F)
1973	40.0 C (104.0 F)
1974	37.0 C (98.6 F)
1975	42.9 C (109.2 F)
1976	39.0 C (102.2 F)
1977	38.7 C (101.7 F)
1978	39.8 C (103.6 F)
1979	41.6 C (106.9 F)
1980	41.3 C (106.3 F)
1981	40.9 C (105.6 F)
1982	39.8 C (103.6 F)
1983	43.0 C (109.4 F)
1984	40.5 C (104.9 F)
1985	42.0 C (107.6 F)

Coldest night (TNn)

The coldest night of the year at Nan, 1951 to 1985. The record is 3.5 C (38.3 F) in 1974, marked on the chart; the median year is 7.6 C (45.7 F).

Coldest night (TNn) at Nan by year
Year	Coldest night (TNn)
1951	9.2 C (48.6 F)
1952	10.4 C (50.7 F)
1953	6.6 C (43.9 F)
1954	7.4 C (45.3 F)
1955	5.0 C (41.0 F)
1956	8.1 C (46.6 F)
1957	7.8 C (46.0 F)
1958	4.8 C (40.6 F)
1959	8.0 C (46.4 F)
1960	5.9 C (42.6 F)
1961	5.0 C (41.0 F)
1962	8.4 C (47.1 F)
1963	5.2 C (41.4 F)
1964	8.3 C (46.9 F)
1965	7.8 C (46.0 F)
1966	9.5 C (49.1 F)
1967	4.7 C (40.5 F)
1968	7.0 C (44.6 F)
1969	9.8 C (49.6 F)
1970	7.4 C (45.3 F)
1971	5.9 C (42.6 F)
1972	7.8 C (46.0 F)
1973	5.0 C (41.0 F)
1974	3.5 C (38.3 F)
1975	4.9 C (40.8 F)
1976	5.2 C (41.4 F)
1977	11.4 C (52.5 F)
1978	8.0 C (46.4 F)
1979	10.4 C (50.7 F)
1980	8.1 C (46.6 F)
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a

Wettest day (Rx1day)

The wettest day of the year at Nan, 1951 to 1985. The record is 189.7 mm (7.5 in) in 1980, marked on the chart; the median year is 77.6 mm (3.1 in).

Wettest day (Rx1day) at Nan by year
Year	Wettest day (Rx1day)
1951	69.8 mm (2.7 in)
1952	182.9 mm (7.2 in)
1953	84.3 mm (3.3 in)
1954	67.5 mm (2.7 in)
1955	60.0 mm (2.4 in)
1956	94.6 mm (3.7 in)
1957	94.6 mm (3.7 in)
1958	76.5 mm (3.0 in)
1959	95.5 mm (3.8 in)
1960	97.2 mm (3.8 in)
1961	115.0 mm (4.5 in)
1962	88.5 mm (3.5 in)
1963	71.2 mm (2.8 in)
1964	58.3 mm (2.3 in)
1965	61.2 mm (2.4 in)
1966	70.8 mm (2.8 in)
1967	134.8 mm (5.3 in)
1968	98.8 mm (3.9 in)
1969	93.6 mm (3.7 in)
1970	68.1 mm (2.7 in)
1971	65.3 mm (2.6 in)
1972	62.5 mm (2.5 in)
1973	100.0 mm (3.9 in)
1974	77.3 mm (3.0 in)
1975	73.6 mm (2.9 in)
1976	73.4 mm (2.9 in)
1977	55.2 mm (2.2 in)
1978	80.1 mm (3.2 in)
1979	72.6 mm (2.9 in)
1980	189.7 mm (7.5 in)
1981	155.2 mm (6.1 in)
1982	95.0 mm (3.7 in)
1983	78.4 mm (3.1 in)
1984	77.6 mm (3.1 in)
1985	69.1 mm (2.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Nan, 1951 to 1985. The record is 323.9 mm (12.8 in) in 1980, marked on the chart; the median year is 157.6 mm (6.2 in).

Wettest five days (Rx5day) at Nan by year
Year	Wettest five days (Rx5day)
1951	184.4 mm (7.3 in)
1952	217.1 mm (8.5 in)
1953	149.6 mm (5.9 in)
1954	133.6 mm (5.3 in)
1955	215.8 mm (8.5 in)
1956	157.6 mm (6.2 in)
1957	234.0 mm (9.2 in)
1958	108.0 mm (4.3 in)
1959	194.3 mm (7.6 in)
1960	231.4 mm (9.1 in)
1961	237.2 mm (9.3 in)
1962	160.1 mm (6.3 in)
1963	203.0 mm (8.0 in)
1964	117.1 mm (4.6 in)
1965	145.6 mm (5.7 in)
1966	109.3 mm (4.3 in)
1967	162.7 mm (6.4 in)
1968	133.6 mm (5.3 in)
1969	128.7 mm (5.1 in)
1970	133.1 mm (5.2 in)
1971	145.8 mm (5.7 in)
1972	138.8 mm (5.5 in)
1973	170.9 mm (6.7 in)
1974	99.4 mm (3.9 in)
1975	122.4 mm (4.8 in)
1976	181.3 mm (7.1 in)
1977	109.2 mm (4.3 in)
1978	133.7 mm (5.3 in)
1979	160.5 mm (6.3 in)
1980	323.9 mm (12.8 in)
1981	230.9 mm (9.1 in)
1982	159.9 mm (6.3 in)
1983	137.6 mm (5.4 in)
1984	187.6 mm (7.4 in)
1985	128.3 mm (5.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Nan, 1951 to 1985. The record is 85 days in 1982, marked on the chart; the median year is 53 days.

Longest dry spell (CDD) at Nan by year
Year	Longest dry spell (CDD)
1951	49 days
1952	33 days
1953	33 days
1954	53 days
1955	51 days
1956	47 days
1957	82 days
1958	51 days
1959	77 days
1960	34 days
1961	45 days
1962	51 days
1963	56 days
1964	49 days
1965	58 days
1966	45 days
1967	68 days
1968	75 days
1969	46 days
1970	75 days
1971	76 days
1972	54 days
1973	49 days
1974	78 days
1975	50 days
1976	50 days
1977	75 days
1978	46 days
1979	72 days
1980	51 days
1981	55 days
1982	85 days
1983	53 days
1984	73 days
1985	81 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

35 years, 1951 to 1985

A day with at least 79.1 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 231.5 mm (9.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Nan: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	79.1 mm (3.1 in)
5 years	102.9 mm (4.1 in)
10 years	123.8 mm (4.9 in)
25 years	158.2 mm (6.2 in)
50 years	191.1 mm (7.5 in)	Longer than the 35 years of record
100 years	231.5 mm (9.1 in)	Longer than the 35 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, 35 years of values from 1951 to 1985.

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: 189.7 mm (7.5 in) in 1980; 182.9 mm (7.2 in) in 1952; 155.2 mm (6.1 in) in 1981.

Download the Data

Data for Nan standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Nan 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).