Lanna Weather Records (SWE00138458)

Record envelope, standing records and threshold days for Lanna (SWE00138458), Sweden, with 82 years of record.

Key Facts for Lanna

Lanna (SWE00138458) is a weather station in Sweden at 58.35 latitude and 13.13 longitude, 80 m (262 ft) above sea level.
The station reports from 1945 to 2026, 82 years of record.
1,464 records set at Lanna still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Lanna set a daily record precipitation of 21.0 mm (0.8 in) on 13 May 2026.

About the Station

Location: Sweden, 58.35 latitude, 13.13 longitude.
Elevation: 80 m (262 ft).
Period of record: 1945 to 2026, 82 years.
Eligible elements: 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 Lanna. 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 Lanna, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	8.5 C (47.3 F)	-25.4 C (-13.7 F)	n/a	n/a
Feb	10.1 C (50.2 F)	-37.0 C (-34.6 F)	n/a	n/a
Mar	18.8 C (65.8 F)	-26.9 C (-16.4 F)	n/a	n/a
Apr	25.0 C (77.0 F)	-13.2 C (8.2 F)	n/a	n/a
May	30.5 C (86.9 F)	-4.2 C (24.4 F)	n/a	n/a
Jun	35.0 C (95.0 F)	-1.0 C (30.2 F)	n/a	n/a
Jul	32.3 C (90.1 F)	3.9 C (39.0 F)	n/a	n/a
Aug	31.9 C (89.4 F)	0.6 C (33.1 F)	n/a	n/a
Sep	26.7 C (80.1 F)	-4.7 C (23.5 F)	n/a	n/a
Oct	19.8 C (67.6 F)	-9.0 C (15.8 F)	n/a	n/a
Nov	12.3 C (54.1 F)	-19.7 C (-3.5 F)	n/a	n/a
Dec	11.0 C (51.8 F)	-26.4 C (-15.5 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Lanna still stand. 1947 holds the most, with 81.

Standing records at Lanna by the year they were set
Year set	Standing records
1945	59
1946	40
1947	81
1948	47
1949	78
1950	24
1951	35
1952	67
1953	37
1954	26
1955	67
1956	48
1957	52
1958	38
1959	52
1960	42
1961	64
1962	58
1963	43
1964	44
1965	54
1966	63
1967	39
1968	69
1969	63
1970	58
1971	65
1980	9
1983	22
1984	17
1985	3

All-Time Record Progression

1 new records

1 all-time records were set at Lanna between 19 August 2014 and 19 August 2014. Each dot is a new record.

Wettest Day of Each Month

Aug: 76.1 mm (3.0 in)

The wettest day on record for each calendar month at Lanna. The most was 76.1 mm (3.0 in) on 19 August 2014.

Record daily precipitation for each month at Lanna
Month	Record daily precipitation (mm)	Date
Jan	18.5 mm (0.7 in)	9 January 2014
Feb	27.2 mm (1.1 in)	7 February 1990
Mar	26.5 mm (1.0 in)	20 March 1977
Apr	30.2 mm (1.2 in)	7 April 1949
May	49.0 mm (1.9 in)	3 May 1945
Jun	56.9 mm (2.2 in)	16 June 1987
Jul	60.4 mm (2.4 in)	17 July 1958
Aug	76.1 mm (3.0 in)	19 August 2014
Sep	44.9 mm (1.8 in)	11 September 1946
Oct	39.6 mm (1.6 in)	17 October 1967
Nov	33.4 mm (1.3 in)	18 November 1981
Dec	20.5 mm (0.8 in)	27 December 1976

Period of Record Coverage

1945 to 1985

32 years of record at Lanna, 1945 to 1985. 7 years have data for under 90 percent of days and are left out of rankings: 1946, 1947, 1980, 1982, 1983, 1984, 1985.

Days with data per year at Lanna
Year	Days with data	Share of year	Complete
1945	349	96%	Yes
1946	185	51%	No
1947	317	87%	No
1948	366	100%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	364	99%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	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	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1980	31	8%	No
1982	30	8%	No
1983	210	58%	No
1984	183	50%	No
1985	61	17%	No

Latest Records

Latest records at Lanna
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
13 May 2026	Lanna, SE	daily rain	21.0 mm (0.8 in)	6.0 mm (0.24 in)	56 years	20 of 100 (Routine)
6 February 2026	Lanna, SE	daily rain	10.7 mm (0.4 in)	0.1 mm (0.00 in)	38 years	19 of 100 (Routine)
8 December 2025	Lanna, SE	daily rain	9.4 mm (0.37 in)	0.3 mm (0.01 in)	4 years	10 of 100 (Routine)
5 September 2025	Lanna, SE	daily rain	26.7 mm (1.1 in)	6.9 mm (0.27 in)	60 years	38 of 100 (Notable)
7 January 2025	Lanna, SE	daily rain	10.6 mm (0.4 in)	0.5 mm (0.02 in)	76 years	20 of 100 (Routine)
31 December 2024	Lanna, SE	daily rain	11.3 mm (0.4 in)	2.8 mm (0.11 in)	12 years	20 of 100 (Routine)
24 September 2024	Lanna, SE	daily rain	18.6 mm (0.7 in)	3.5 mm (0.14 in)	41 years	20 of 100 (Routine)
12 April 2024	Lanna, SE	daily rain	9.2 mm (0.36 in)	0.3 mm (0.01 in)	25 years	15 of 100 (Routine)
9 April 2024	Lanna, SE	daily rain	6.8 mm (0.27 in)	0.9 mm (0.04 in)	74 years	20 of 100 (Routine)
15 February 2024	Lanna, SE	daily rain	9.9 mm (0.39 in)	0.3 mm (0.01 in)	66 years	20 of 100 (Routine)
12 February 2024	Lanna, SE	daily rain	14.4 mm (0.6 in)	4.8 mm (0.19 in)	61 years	20 of 100 (Routine)
29 October 2023	Lanna, SE	daily rain	12.7 mm (0.5 in)	0.6 mm (0.02 in)	21 years	14 of 100 (Routine)
19 September 2023	Lanna, SE	daily rain	19.4 mm (0.8 in)	5.2 mm (0.20 in)	49 years	20 of 100 (Routine)
26 August 2023	Lanna, SE	daily rain	56.0 mm (2.2 in)	13.1 mm (0.5 in)	44 years	40 of 100 (Notable)
12 August 2023	Lanna, SE	daily rain	36.5 mm (1.4 in)	6.5 mm (0.26 in)	40 years	29 of 100 (Routine)
6 August 2023	Lanna, SE	daily rain	26.1 mm (1.0 in)	3.9 mm (0.15 in)	14 years	17 of 100 (Routine)
12 July 2023	Lanna, SE	daily rain	38.1 mm (1.5 in)	22.0 mm (0.9 in)	29 years	44 of 100 (Notable)
16 May 2023	Lanna, SE	daily rain	29.6 mm (1.2 in)	8.8 mm (0.35 in)	40 years	37 of 100 (Notable)
30 March 2023	Lanna, SE	daily rain (Tie)	6.0 mm (0.24 in)	tie	69 years	6 of 100 (Routine)
13 March 2023	Lanna, SE	daily rain	10.4 mm (0.4 in)	1.8 mm (0.07 in)	41 years	20 of 100 (Routine)

Climate Trend

24 complete years, 1948 to 1971

One stripe for each of 24 complete years at Lanna, 1948 to 1971. Blue stripes are years cooler than the station's own mean of 5.9 C (42.7 F); red stripes are warmer. The coolest year was 1970, at 4.4 C (40.0 F), and the warmest was 1949, at 7.9 C (46.1 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at Lanna as warming stripes, 1948 to 1971
Year	Annual mean temperature	Difference from the station mean
1948	6.6 C	+0.66 C
1949	7.9 C	+1.93 C
1950	6.2 C	+0.25 C
1951	6.2 C	+0.30 C
1952	5.1 C	-0.81 C
1953	7.2 C	+1.32 C
1954	5.7 C	-0.24 C
1955	5.3 C	-0.61 C
1956	4.7 C	-1.21 C
1957	6.3 C	+0.39 C
1958	5.6 C	-0.33 C
1959	7.5 C	+1.55 C
1960	6.1 C	+0.17 C
1961	7.0 C	+1.12 C
1962	4.9 C	-0.99 C
1963	4.9 C	-1.03 C
1964	6.1 C	+0.18 C
1965	5.2 C	-0.72 C
1966	5.0 C	-0.90 C
1967	6.5 C	+0.60 C
1968	5.8 C	-0.12 C
1969	5.4 C	-0.54 C
1970	4.4 C	-1.50 C
1971	6.5 C	+0.59 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

1945 to 2026

Yearly extremes at Lanna: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.0 C (95.0 F)	1947	29.0 C (84.1 F)	32
Coldest night (TNn)	-37.0 C (-34.6 F)	1966	-20.0 C (-4.0 F)	32
Wettest day (Rx1day)	76.1 mm (3.0 in)	2014	30.0 mm (1.2 in)	82
Wettest five days (Rx5day)	106.0 mm (4.2 in)	2014	50.8 mm (2.0 in)	82
Longest dry spell (CDD)	61 days	1974	23 days	82

Hottest day (TXx)

The hottest day of the year at Lanna, 1945 to 2026. The record is 35.0 C (95.0 F) in 1947, marked on the chart; the median year is 29.0 C (84.1 F).

Hottest day (TXx) at Lanna by year
Year	Hottest day (TXx)
1945	31.0 C (87.8 F)
1946	30.5 C (86.9 F)
1947	35.0 C (95.0 F)
1948	32.0 C (89.6 F)
1949	29.0 C (84.2 F)
1950	26.5 C (79.7 F)
1951	27.2 C (81.0 F)
1952	28.0 C (82.4 F)
1953	29.5 C (85.1 F)
1954	26.8 C (80.2 F)
1955	31.6 C (88.9 F)
1956	27.0 C (80.6 F)
1957	28.2 C (82.8 F)
1958	30.4 C (86.7 F)
1959	29.6 C (85.3 F)
1960	29.2 C (84.6 F)
1961	27.3 C (81.1 F)
1962	24.6 C (76.3 F)
1963	27.7 C (81.9 F)
1964	29.7 C (85.5 F)
1965	26.3 C (79.3 F)
1966	29.4 C (84.9 F)
1967	28.2 C (82.8 F)
1968	30.6 C (87.1 F)
1969	32.3 C (90.1 F)
1970	32.7 C (90.9 F)
1971	28.9 C (84.0 F)
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	7.8 C (46.0 F)
1981	n/a
1982	15.7 C (60.3 F)
1983	30.0 C (86.0 F)
1984	27.1 C (80.8 F)
1985	24.1 C (75.4 F)
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	n/a
2022	n/a
2023	n/a
2024	n/a
2025	n/a
2026	n/a

Coldest night (TNn)

The coldest night of the year at Lanna, 1945 to 2026. The record is -37.0 C (-34.6 F) in 1966, marked on the chart; the median year is -20.0 C (-4.0 F).

Coldest night (TNn) at Lanna by year
Year	Coldest night (TNn)
1945	-21.5 C (-6.7 F)
1946	-22.8 C (-9.0 F)
1947	-34.8 C (-30.6 F)
1948	-23.0 C (-9.4 F)
1949	-12.0 C (10.4 F)
1950	-20.5 C (-4.9 F)
1951	-18.0 C (-0.4 F)
1952	-18.2 C (-0.8 F)
1953	-20.0 C (-4.0 F)
1954	-19.0 C (-2.2 F)
1955	-24.1 C (-11.4 F)
1956	-25.0 C (-13.0 F)
1957	-16.0 C (3.2 F)
1958	-21.5 C (-6.7 F)
1959	-17.5 C (0.5 F)
1960	-18.6 C (-1.5 F)
1961	-16.7 C (1.9 F)
1962	-26.9 C (-16.4 F)
1963	-30.1 C (-22.2 F)
1964	-19.7 C (-3.5 F)
1965	-22.0 C (-7.6 F)
1966	-37.0 C (-34.6 F)
1967	-19.0 C (-2.2 F)
1968	-22.2 C (-8.0 F)
1969	-25.4 C (-13.7 F)
1970	-30.9 C (-23.6 F)
1971	-19.6 C (-3.3 F)
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	-16.7 C (1.9 F)
1981	n/a
1982	-2.4 C (27.7 F)
1983	-17.5 C (0.5 F)
1984	-20.0 C (-4.0 F)
1985	-7.0 C (19.4 F)
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	n/a
2022	n/a
2023	n/a
2024	n/a
2025	n/a
2026	n/a

Wettest day (Rx1day)

The wettest day of the year at Lanna, 1945 to 2026. The record is 76.1 mm (3.0 in) in 2014, marked on the chart; the median year is 30.0 mm (1.2 in).

Wettest day (Rx1day) at Lanna by year
Year	Wettest day (Rx1day)
1945	49.0 mm (1.9 in)
1946	44.9 mm (1.8 in)
1947	17.2 mm (0.7 in)
1948	33.0 mm (1.3 in)
1949	30.2 mm (1.2 in)
1950	29.7 mm (1.2 in)
1951	18.0 mm (0.7 in)
1952	24.0 mm (0.9 in)
1953	42.0 mm (1.7 in)
1954	22.0 mm (0.9 in)
1955	33.8 mm (1.3 in)
1956	17.0 mm (0.7 in)
1957	25.0 mm (1.0 in)
1958	60.4 mm (2.4 in)
1959	37.0 mm (1.5 in)
1960	32.3 mm (1.3 in)
1961	21.1 mm (0.8 in)
1962	20.7 mm (0.8 in)
1963	33.0 mm (1.3 in)
1964	30.0 mm (1.2 in)
1965	31.0 mm (1.2 in)
1966	30.7 mm (1.2 in)
1967	39.6 mm (1.6 in)
1968	30.0 mm (1.2 in)
1969	22.3 mm (0.9 in)
1970	20.0 mm (0.8 in)
1971	39.0 mm (1.5 in)
1972	28.8 mm (1.1 in)
1973	18.9 mm (0.7 in)
1974	26.0 mm (1.0 in)
1975	19.0 mm (0.7 in)
1976	29.0 mm (1.1 in)
1977	26.5 mm (1.0 in)
1978	29.7 mm (1.2 in)
1979	42.9 mm (1.7 in)
1980	39.5 mm (1.6 in)
1981	33.4 mm (1.3 in)
1982	21.4 mm (0.8 in)
1983	30.0 mm (1.2 in)
1984	29.9 mm (1.2 in)
1985	24.0 mm (0.9 in)
1986	19.6 mm (0.8 in)
1987	56.9 mm (2.2 in)
1988	38.8 mm (1.5 in)
1989	19.1 mm (0.8 in)
1990	27.2 mm (1.1 in)
1991	39.1 mm (1.5 in)
1992	20.5 mm (0.8 in)
1993	32.9 mm (1.3 in)
1994	19.6 mm (0.8 in)
1995	37.0 mm (1.5 in)
1996	37.5 mm (1.5 in)
1997	36.8 mm (1.4 in)
1998	32.2 mm (1.3 in)
1999	24.1 mm (0.9 in)
2000	25.8 mm (1.0 in)
2001	30.9 mm (1.2 in)
2002	26.2 mm (1.0 in)
2003	31.3 mm (1.2 in)
2004	49.7 mm (2.0 in)
2005	42.2 mm (1.7 in)
2006	22.5 mm (0.9 in)
2007	33.2 mm (1.3 in)
2008	46.6 mm (1.8 in)
2009	24.5 mm (1.0 in)
2010	26.2 mm (1.0 in)
2011	42.2 mm (1.7 in)
2012	40.7 mm (1.6 in)
2013	21.7 mm (0.9 in)
2014	76.1 mm (3.0 in)
2015	19.7 mm (0.8 in)
2016	19.2 mm (0.8 in)
2017	16.0 mm (0.6 in)
2018	23.5 mm (0.9 in)
2019	23.2 mm (0.9 in)
2020	42.6 mm (1.7 in)
2021	43.6 mm (1.7 in)
2022	34.2 mm (1.3 in)
2023	56.0 mm (2.2 in)
2024	23.0 mm (0.9 in)
2025	26.7 mm (1.1 in)
2026	21.0 mm (0.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Lanna, 1945 to 2026. The record is 106.0 mm (4.2 in) in 2014, marked on the chart; the median year is 50.8 mm (2.0 in).

Wettest five days (Rx5day) at Lanna by year
Year	Wettest five days (Rx5day)
1945	75.6 mm (3.0 in)
1946	56.7 mm (2.2 in)
1947	27.3 mm (1.1 in)
1948	68.0 mm (2.7 in)
1949	61.0 mm (2.4 in)
1950	37.0 mm (1.5 in)
1951	46.7 mm (1.8 in)
1952	48.0 mm (1.9 in)
1953	68.1 mm (2.7 in)
1954	44.4 mm (1.7 in)
1955	35.4 mm (1.4 in)
1956	37.6 mm (1.5 in)
1957	62.1 mm (2.4 in)
1958	93.1 mm (3.7 in)
1959	56.6 mm (2.2 in)
1960	52.8 mm (2.1 in)
1961	34.4 mm (1.4 in)
1962	35.4 mm (1.4 in)
1963	41.0 mm (1.6 in)
1964	57.2 mm (2.3 in)
1965	63.4 mm (2.5 in)
1966	32.9 mm (1.3 in)
1967	84.9 mm (3.3 in)
1968	69.3 mm (2.7 in)
1969	49.9 mm (2.0 in)
1970	46.0 mm (1.8 in)
1971	50.8 mm (2.0 in)
1972	40.6 mm (1.6 in)
1973	41.3 mm (1.6 in)
1974	47.4 mm (1.9 in)
1975	40.3 mm (1.6 in)
1976	56.1 mm (2.2 in)
1977	53.2 mm (2.1 in)
1978	45.4 mm (1.8 in)
1979	47.0 mm (1.9 in)
1980	74.8 mm (2.9 in)
1981	50.9 mm (2.0 in)
1982	44.1 mm (1.7 in)
1983	47.7 mm (1.9 in)
1984	52.8 mm (2.1 in)
1985	48.1 mm (1.9 in)
1986	32.9 mm (1.3 in)
1987	96.3 mm (3.8 in)
1988	72.8 mm (2.9 in)
1989	37.4 mm (1.5 in)
1990	51.9 mm (2.0 in)
1991	46.8 mm (1.8 in)
1992	41.7 mm (1.6 in)
1993	58.5 mm (2.3 in)
1994	44.0 mm (1.7 in)
1995	57.9 mm (2.3 in)
1996	68.5 mm (2.7 in)
1997	58.4 mm (2.3 in)
1998	63.3 mm (2.5 in)
1999	42.8 mm (1.7 in)
2000	41.1 mm (1.6 in)
2001	67.0 mm (2.6 in)
2002	51.9 mm (2.0 in)
2003	57.8 mm (2.3 in)
2004	71.5 mm (2.8 in)
2005	70.6 mm (2.8 in)
2006	46.6 mm (1.8 in)
2007	48.5 mm (1.9 in)
2008	63.6 mm (2.5 in)
2009	53.5 mm (2.1 in)
2010	61.7 mm (2.4 in)
2011	81.5 mm (3.2 in)
2012	67.7 mm (2.7 in)
2013	47.2 mm (1.9 in)
2014	106.0 mm (4.2 in)
2015	40.6 mm (1.6 in)
2016	34.8 mm (1.4 in)
2017	36.3 mm (1.4 in)
2018	29.7 mm (1.2 in)
2019	40.5 mm (1.6 in)
2020	52.8 mm (2.1 in)
2021	89.4 mm (3.5 in)
2022	36.9 mm (1.5 in)
2023	75.4 mm (3.0 in)
2024	55.5 mm (2.2 in)
2025	38.6 mm (1.5 in)
2026	27.5 mm (1.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Lanna, 1945 to 2026. The record is 61 days in 1974, marked on the chart; the median year is 23 days.

Longest dry spell (CDD) at Lanna by year
Year	Longest dry spell (CDD)
1945	16 days
1946	20 days
1947	38 days
1948	24 days
1949	22 days
1950	20 days
1951	24 days
1952	23 days
1953	31 days
1954	14 days
1955	24 days
1956	40 days
1957	17 days
1958	30 days
1959	27 days
1960	27 days
1961	19 days
1962	20 days
1963	22 days
1964	39 days
1965	24 days
1966	18 days
1967	15 days
1968	19 days
1969	23 days
1970	16 days
1971	20 days
1972	22 days
1973	19 days
1974	61 days
1975	36 days
1976	25 days
1977	22 days
1978	19 days
1979	18 days
1980	23 days
1981	22 days
1982	36 days
1983	26 days
1984	22 days
1985	21 days
1986	27 days
1987	32 days
1988	30 days
1989	22 days
1990	25 days
1991	29 days
1992	29 days
1993	26 days
1994	18 days
1995	29 days
1996	30 days
1997	18 days
1998	20 days
1999	20 days
2000	19 days
2001	15 days
2002	21 days
2003	28 days
2004	26 days
2005	23 days
2006	21 days
2007	21 days
2008	24 days
2009	25 days
2010	20 days
2011	28 days
2012	28 days
2013	28 days
2014	17 days
2015	41 days
2016	22 days
2017	19 days
2018	26 days
2019	40 days
2020	24 days
2021	21 days
2022	40 days
2023	30 days
2024	23 days
2025	36 days
2026	21 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.

Frost Dates and Growing Season

24 years with a frost

Across 24 years with a frost, the median last spring frost at Lanna falls on 10 May and the median first autumn frost on 26 September, which leaves a median of 140 days between them.

Frost dates and growing season at Lanna
Measure	Median, all years	Earliest period	Recent period (1948 to 1971)	Recent against earliest	Fitted trend
Last spring frost	10 May	n/a	10 May	n/a	n/a
First autumn frost	26 September	n/a	26 September	n/a	n/a
Growing days	140 days	n/a	140 days	n/a	n/a

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

81 years, 1945 to 2025

A day with at least 29.2 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 69.1 mm (2.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Lanna: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	29.2 mm (1.1 in)
5 years	39.0 mm (1.5 in)
10 years	45.8 mm (1.8 in)
25 years	54.8 mm (2.2 in)
50 years	61.8 mm (2.4 in)
100 years	69.1 mm (2.7 in)	Longer than the 81 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, 81 years of values from 1945 to 2025.

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: 76.1 mm (3.0 in) in 2014; 60.4 mm (2.4 in) in 1958; 56.9 mm (2.2 in) in 1987.

Download the Data

Data for Lanna standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Lanna 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).