Koln-Botanischer Garten Weather Records (GME00124666)

Record envelope, standing records and threshold days for Koln-Botanischer Garten (GME00124666), Germany, with 49 years of record.

Key Facts for Koln-Botanischer Garten

Koln-Botanischer Garten (GME00124666) is a weather station in Germany at 50.96 latitude and 6.97 longitude, 45 m (148 ft) above sea level.
The station reports from 1936 to 1984, 49 years of record.
1,464 records set at Koln-Botanischer Garten still stand.
Records are tracked for tmax, tmin, prcp, snwd: an element needs 30 years of data to be eligible.
Koln-Botanischer Garten set a daily record precipitation of 29.7 mm (1.2 in) on 22 November 1984.

About the Station

Location: Germany, 50.96 latitude, 6.97 longitude.
Elevation: 45 m (148 ft).
Period of record: 1936 to 1984, 49 years.
Eligible elements: tmax, tmin, prcp, snwd.

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 Koln-Botanischer Garten. 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 Koln-Botanischer Garten, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	14.7 C (58.5 F)	-19.3 C (-2.7 F)	n/a	n/a
Feb	19.2 C (66.6 F)	-20.2 C (-4.4 F)	n/a	n/a
Mar	26.3 C (79.3 F)	-11.0 C (12.2 F)	n/a	n/a
Apr	31.4 C (88.5 F)	-3.9 C (25.0 F)	n/a	n/a
May	33.5 C (92.3 F)	-3.0 C (26.6 F)	n/a	n/a
Jun	35.1 C (95.2 F)	2.9 C (37.2 F)	n/a	n/a
Jul	39.3 C (102.7 F)	6.1 C (43.0 F)	n/a	n/a
Aug	36.7 C (98.1 F)	4.7 C (40.5 F)	n/a	n/a
Sep	33.9 C (93.0 F)	-1.0 C (30.2 F)	n/a	n/a
Oct	26.5 C (79.7 F)	-3.5 C (25.7 F)	n/a	n/a
Nov	20.5 C (68.9 F)	-7.2 C (19.0 F)	n/a	n/a
Dec	17.2 C (63.0 F)	-18.5 C (-1.3 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Koln-Botanischer Garten still stand. 1961 holds the most, with 61.

Standing records at Koln-Botanischer Garten by the year they were set
Year set	Standing records
1936	52
1937	25
1938	53
1939	32
1940	53
1941	45
1942	44
1943	33
1944	32
1949	26
1950	28
1951	15
1952	31
1953	32
1954	16
1955	23
1956	57
1957	42
1958	30
1959	28
1960	25
1961	61
1962	40
1963	37
1964	36
1965	24
1966	40
1967	21
1968	24
1969	28
1970	10
1971	35
1972	26
1973	19
1974	39
1975	22
1976	45
1977	25
1978	23
1979	28
1980	36
1981	33
1982	23
1983	37
1984	30

Wettest Day of Each Month

Jun: 83.5 mm (3.3 in)

The wettest day on record for each calendar month at Koln-Botanischer Garten. The most was 83.5 mm (3.3 in) on 2 June 1961.

Record daily precipitation for each month at Koln-Botanischer Garten
Month	Record daily precipitation (mm)	Date
Jan	21.9 mm (0.9 in)	26 January 1970
Feb	36.8 mm (1.4 in)	6 February 1984
Mar	31.8 mm (1.3 in)	24 March 1957
Apr	68.3 mm (2.7 in)	17 April 1936
May	43.8 mm (1.7 in)	23 May 1940
Jun	83.5 mm (3.3 in)	2 June 1961
Jul	49.7 mm (2.0 in)	7 July 1936
Aug	53.6 mm (2.1 in)	30 August 1968
Sep	60.7 mm (2.4 in)	3 September 1968
Oct	44.6 mm (1.8 in)	23 October 1966
Nov	37.8 mm (1.5 in)	3 November 1940
Dec	24.4 mm (1.0 in)	17 December 1980

Period of Record Coverage

1936 to 1984

45 years of record at Koln-Botanischer Garten, 1936 to 1984. 1 years have data for under 90 percent of days and are left out of rankings: 1949.

Days with data per year at Koln-Botanischer Garten
Year	Days with data	Share of year	Complete
1936	366	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	366	100%	Yes
1949	153	42%	No
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	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
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	365	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

Latest Records

Latest records at Koln-Botanischer Garten
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
22 November 1984	Koln-Botanischer Garten, DE	daily rain	29.7 mm (1.2 in)	5.4 mm (0.21 in)	10 years	18 of 100 (Routine)
22 November 1984	Koln-Botanischer Garten, DE	daily high max	15.9 C (60.6 F)	1.0 C (1.8 F)	4 years	7 of 100 (Routine)
25 October 1984	Koln-Botanischer Garten, DE	daily rain	23.9 mm (0.9 in)	8.3 mm (0.33 in)	23 years	20 of 100 (Routine)
1 October 1984	Koln-Botanischer Garten, DE	daily rain	18.2 mm (0.7 in)	8.4 mm (0.33 in)	40 years	20 of 100 (Routine)
26 September 1984	Koln-Botanischer Garten, DE	daily low max	12.9 C (55.2 F)	0.8 C (1.4 F)	41 years	17 of 100 (Routine)
24 September 1984	Koln-Botanischer Garten, DE	daily low max	11.6 C (52.9 F)	0.6 C (1.1 F)	11 years	8 of 100 (Routine)
23 September 1984	Koln-Botanischer Garten, DE	daily low max	11.8 C (53.2 F)	0.9 C (1.6 F)	10 years	9 of 100 (Routine)
14 September 1984	Koln-Botanischer Garten, DE	daily rain	27.2 mm (1.1 in)	8.2 mm (0.32 in)	17 years	22 of 100 (Routine)
10 September 1984	Koln-Botanischer Garten, DE	daily low max	13.3 C (55.9 F)	0.2 C (0.4 F)	8 years	6 of 100 (Routine)
9 September 1984	Koln-Botanischer Garten, DE	daily low max	13.7 C (56.7 F)	2.3 C (4.1 F)	43 years	21 of 100 (Routine)
9 September 1984	Koln-Botanischer Garten, DE	daily rain	17.2 mm (0.7 in)	2.5 mm (0.10 in)	15 years	12 of 100 (Routine)
8 September 1984	Koln-Botanischer Garten, DE	daily low max	13.5 C (56.3 F)	1.8 C (3.2 F)	32 years	17 of 100 (Routine)
7 September 1984	Koln-Botanischer Garten, DE	daily low max	10.8 C (51.4 F)	3.1 C (5.6 F)	24 years	18 of 100 (Routine)
6 September 1984	Koln-Botanischer Garten, DE	daily rain	20.5 mm (0.8 in)	0.8 mm (0.03 in)	29 years	13 of 100 (Routine)
6 September 1984	Koln-Botanischer Garten, DE	daily low max	12.2 C (54.0 F)	0.5 C (0.9 F)	19 years	10 of 100 (Routine)
31 July 1984	Koln-Botanischer Garten, DE	daily high min	21.1 C (70.0 F)	1.9 C (3.4 F)	2 years	10 of 100 (Routine)
30 July 1984	Koln-Botanischer Garten, DE	daily high max (Tie)	32.6 C (90.7 F)	tie	6 years	1 of 100 (Routine)
20 July 1984	Koln-Botanischer Garten, DE	daily low max	16.2 C (61.2 F)	0.2 C (0.4 F)	14 years	8 of 100 (Routine)
17 July 1984	Koln-Botanischer Garten, DE	daily low max	15.8 C (60.4 F)	1.2 C (2.2 F)	18 years	11 of 100 (Routine)
14 July 1984	Koln-Botanischer Garten, DE	daily rain	17.7 mm (0.7 in)	2.2 mm (0.09 in)	22 years	13 of 100 (Routine)

Climate Trend

44 complete years, 1936 to 1984

One stripe for each of 44 complete years at Koln-Botanischer Garten, 1936 to 1984. Blue stripes are years cooler than the station's own mean of 10.4 C (50.8 F); red stripes are warmer. The coolest year was 1940, at 8.5 C (47.3 F), and the warmest was 1959, at 11.9 C (53.4 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at Koln-Botanischer Garten as warming stripes, 1936 to 1984
Year	Annual mean temperature	Difference from the station mean
1936	10.2 C	-0.29 C
1937	10.3 C	-0.14 C
1938	10.2 C	-0.22 C
1939	10.1 C	-0.34 C
1940	8.5 C	-1.94 C
1941	9.3 C	-1.14 C
1942	9.3 C	-1.20 C
1943	10.6 C	+0.12 C
1944	10.1 C	-0.38 C
1950	11.0 C	+0.50 C
1951	11.0 C	+0.54 C
1952	10.6 C	+0.15 C
1953	11.4 C	+0.99 C
1954	10.4 C	-0.07 C
1955	10.3 C	-0.13 C
1956	9.6 C	-0.89 C
1957	11.4 C	+0.93 C
1958	10.9 C	+0.48 C
1959	11.9 C	+1.46 C
1960	11.0 C	+0.51 C
1961	11.6 C	+1.18 C
1962	9.4 C	-1.03 C
1963	9.3 C	-1.17 C
1964	10.7 C	+0.23 C
1965	10.0 C	-0.46 C
1966	11.1 C	+0.61 C
1967	11.0 C	+0.55 C
1968	10.2 C	-0.21 C
1969	10.3 C	-0.18 C
1970	10.1 C	-0.38 C
1971	10.7 C	+0.25 C
1972	10.0 C	-0.41 C
1973	10.6 C	+0.16 C
1974	10.9 C	+0.49 C
1975	11.1 C	+0.65 C
1976	11.1 C	+0.64 C
1977	10.8 C	+0.33 C
1978	10.0 C	-0.48 C
1979	9.9 C	-0.56 C
1980	10.2 C	-0.26 C
1981	10.3 C	-0.16 C
1982	11.2 C	+0.79 C
1983	11.1 C	+0.69 C
1984	10.2 C	-0.23 C

The fitted trend in annual mean temperature here over 1936 to 1984 is 0.13 C (-0.01 to 0.28) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.24 F (-0.03 to 0.50) per decade. The slope is a straight line fitted to 44 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Koln-Botanischer Garten
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.13 C (-0.01 to 0.28) per decade	0.24 F (-0.03 to 0.50) per decade	1936 to 1984	44	Not clearly different from zero
Mean daily maximum	0.05 C (-0.12 to 0.21) per decade	0.1 F (-0.2 to 0.4) per decade	1936 to 1984	44	Not clearly different from zero
Mean daily minimum	0.2 C (0.1 to 0.4) per decade	0.4 F (0.1 to 0.6) per decade	1936 to 1984	44	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

1936 to 1984

Yearly extremes at Koln-Botanischer Garten: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	39.3 C (102.7 F)	1957	33.2 C (91.8 F)	45
Coldest night (TNn)	-20.2 C (-4.4 F)	1942	-10.5 C (13.1 F)	45
Wettest day (Rx1day)	83.5 mm (3.3 in)	1961	32.4 mm (1.3 in)	45
Wettest five days (Rx5day)	133.4 mm (5.3 in)	1968	59.7 mm (2.4 in)	45
Longest dry spell (CDD)	58 days	1959	19 days	45

Hottest day (TXx)

The hottest day of the year at Koln-Botanischer Garten, 1936 to 1984. The record is 39.3 C (102.7 F) in 1957, marked on the chart; the median year is 33.2 C (91.8 F).

Hottest day (TXx) at Koln-Botanischer Garten by year
Year	Hottest day (TXx)
1936	32.8 C (91.0 F)
1937	35.3 C (95.5 F)
1938	34.1 C (93.4 F)
1939	32.5 C (90.5 F)
1940	29.6 C (85.3 F)
1941	33.7 C (92.7 F)
1942	33.4 C (92.1 F)
1943	35.7 C (96.3 F)
1944	36.7 C (98.1 F)
1949	33.9 C (93.0 F)
1950	32.8 C (91.0 F)
1951	30.8 C (87.4 F)
1952	37.8 C (100.0 F)
1953	33.1 C (91.6 F)
1954	32.8 C (91.0 F)
1955	33.2 C (91.8 F)
1956	31.2 C (88.2 F)
1957	39.3 C (102.7 F)
1958	29.9 C (85.8 F)
1959	39.1 C (102.4 F)
1960	31.6 C (88.9 F)
1961	34.0 C (93.2 F)
1962	31.3 C (88.3 F)
1963	33.2 C (91.8 F)
1964	35.6 C (96.1 F)
1965	30.1 C (86.2 F)
1966	34.4 C (93.9 F)
1967	32.0 C (89.6 F)
1968	32.5 C (90.5 F)
1969	33.2 C (91.8 F)
1970	31.4 C (88.5 F)
1971	31.7 C (89.1 F)
1972	33.5 C (92.3 F)
1973	34.0 C (93.2 F)
1974	34.5 C (94.1 F)
1975	34.0 C (93.2 F)
1976	35.6 C (96.1 F)
1977	33.0 C (91.4 F)
1978	32.6 C (90.7 F)
1979	31.4 C (88.5 F)
1980	31.9 C (89.4 F)
1981	31.4 C (88.5 F)
1982	32.1 C (89.8 F)
1983	35.8 C (96.4 F)
1984	33.4 C (92.1 F)

Coldest night (TNn)

The coldest night of the year at Koln-Botanischer Garten, 1936 to 1984. The record is -20.2 C (-4.4 F) in 1942, marked on the chart; the median year is -10.5 C (13.1 F).

Coldest night (TNn) at Koln-Botanischer Garten by year
Year	Coldest night (TNn)
1936	-9.7 C (14.5 F)
1937	-5.8 C (21.6 F)
1938	-18.5 C (-1.3 F)
1939	-12.3 C (9.9 F)
1940	-19.3 C (-2.7 F)
1941	-13.4 C (7.9 F)
1942	-20.2 C (-4.4 F)
1943	-10.7 C (12.7 F)
1944	-10.0 C (14.0 F)
1949	-4.3 C (24.3 F)
1950	-13.2 C (8.2 F)
1951	-5.5 C (22.1 F)
1952	-7.5 C (18.5 F)
1953	-11.8 C (10.8 F)
1954	-14.9 C (5.2 F)
1955	-11.2 C (11.8 F)
1956	-19.0 C (-2.2 F)
1957	-5.8 C (21.6 F)
1958	-7.2 C (19.0 F)
1959	-5.3 C (22.5 F)
1960	-12.6 C (9.3 F)
1961	-10.5 C (13.1 F)
1962	-12.2 C (10.0 F)
1963	-18.4 C (-1.1 F)
1964	-9.5 C (14.9 F)
1965	-7.2 C (19.0 F)
1966	-12.8 C (9.0 F)
1967	-7.5 C (18.5 F)
1968	-14.0 C (6.8 F)
1969	-10.5 C (13.1 F)
1970	-11.0 C (12.2 F)
1971	-11.0 C (12.2 F)
1972	-10.4 C (13.3 F)
1973	-9.5 C (14.9 F)
1974	-5.0 C (23.0 F)
1975	-7.5 C (18.5 F)
1976	-10.2 C (13.6 F)
1977	-5.5 C (22.1 F)
1978	-14.8 C (5.4 F)
1979	-16.3 C (2.7 F)
1980	-9.2 C (15.4 F)
1981	-9.0 C (15.8 F)
1982	-13.0 C (8.6 F)
1983	-6.5 C (20.3 F)
1984	-5.1 C (22.8 F)

Wettest day (Rx1day)

The wettest day of the year at Koln-Botanischer Garten, 1936 to 1984. The record is 83.5 mm (3.3 in) in 1961, marked on the chart; the median year is 32.4 mm (1.3 in).

Wettest day (Rx1day) at Koln-Botanischer Garten by year
Year	Wettest day (Rx1day)
1936	68.3 mm (2.7 in)
1937	23.5 mm (0.9 in)
1938	32.4 mm (1.3 in)
1939	24.9 mm (1.0 in)
1940	43.8 mm (1.7 in)
1941	45.5 mm (1.8 in)
1942	27.8 mm (1.1 in)
1943	32.5 mm (1.3 in)
1944	41.4 mm (1.6 in)
1949	21.4 mm (0.8 in)
1950	20.2 mm (0.8 in)
1951	26.7 mm (1.1 in)
1952	38.7 mm (1.5 in)
1953	29.1 mm (1.1 in)
1954	39.4 mm (1.6 in)
1955	33.5 mm (1.3 in)
1956	41.6 mm (1.6 in)
1957	31.8 mm (1.3 in)
1958	33.2 mm (1.3 in)
1959	47.9 mm (1.9 in)
1960	29.1 mm (1.1 in)
1961	83.5 mm (3.3 in)
1962	24.5 mm (1.0 in)
1963	29.6 mm (1.2 in)
1964	28.3 mm (1.1 in)
1965	33.8 mm (1.3 in)
1966	44.6 mm (1.8 in)
1967	26.7 mm (1.1 in)
1968	60.7 mm (2.4 in)
1969	47.0 mm (1.9 in)
1970	36.7 mm (1.4 in)
1971	34.1 mm (1.3 in)
1972	36.6 mm (1.4 in)
1973	22.8 mm (0.9 in)
1974	50.8 mm (2.0 in)
1975	25.8 mm (1.0 in)
1976	19.3 mm (0.8 in)
1977	32.1 mm (1.3 in)
1978	22.3 mm (0.9 in)
1979	30.5 mm (1.2 in)
1980	41.5 mm (1.6 in)
1981	31.6 mm (1.2 in)
1982	30.6 mm (1.2 in)
1983	28.3 mm (1.1 in)
1984	37.3 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Koln-Botanischer Garten, 1936 to 1984. The record is 133.4 mm (5.3 in) in 1968, marked on the chart; the median year is 59.7 mm (2.4 in).

Wettest five days (Rx5day) at Koln-Botanischer Garten by year
Year	Wettest five days (Rx5day)
1936	85.0 mm (3.3 in)
1937	49.7 mm (2.0 in)
1938	50.4 mm (2.0 in)
1939	59.7 mm (2.4 in)
1940	61.2 mm (2.4 in)
1941	58.0 mm (2.3 in)
1942	51.8 mm (2.0 in)
1943	42.9 mm (1.7 in)
1944	48.2 mm (1.9 in)
1949	35.6 mm (1.4 in)
1950	41.9 mm (1.6 in)
1951	60.3 mm (2.4 in)
1952	58.9 mm (2.3 in)
1953	66.7 mm (2.6 in)
1954	59.9 mm (2.4 in)
1955	51.2 mm (2.0 in)
1956	79.1 mm (3.1 in)
1957	57.5 mm (2.3 in)
1958	80.1 mm (3.2 in)
1959	47.9 mm (1.9 in)
1960	53.6 mm (2.1 in)
1961	129.9 mm (5.1 in)
1962	41.5 mm (1.6 in)
1963	60.8 mm (2.4 in)
1964	66.3 mm (2.6 in)
1965	60.6 mm (2.4 in)
1966	77.9 mm (3.1 in)
1967	46.7 mm (1.8 in)
1968	133.4 mm (5.3 in)
1969	75.5 mm (3.0 in)
1970	56.6 mm (2.2 in)
1971	75.3 mm (3.0 in)
1972	79.1 mm (3.1 in)
1973	48.8 mm (1.9 in)
1974	64.0 mm (2.5 in)
1975	45.5 mm (1.8 in)
1976	37.2 mm (1.5 in)
1977	86.7 mm (3.4 in)
1978	48.9 mm (1.9 in)
1979	67.4 mm (2.7 in)
1980	67.6 mm (2.7 in)
1981	78.0 mm (3.1 in)
1982	47.8 mm (1.9 in)
1983	58.6 mm (2.3 in)
1984	75.7 mm (3.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Koln-Botanischer Garten, 1936 to 1984. The record is 58 days in 1959, marked on the chart; the median year is 19 days.

Longest dry spell (CDD) at Koln-Botanischer Garten by year
Year	Longest dry spell (CDD)
1936	24 days
1937	19 days
1938	17 days
1939	24 days
1940	21 days
1941	24 days
1942	20 days
1943	18 days
1944	26 days
1949	16 days
1950	12 days
1951	34 days
1952	18 days
1953	27 days
1954	19 days
1955	15 days
1956	19 days
1957	15 days
1958	23 days
1959	58 days
1960	16 days
1961	18 days
1962	24 days
1963	30 days
1964	16 days
1965	13 days
1966	15 days
1967	14 days
1968	24 days
1969	19 days
1970	14 days
1971	26 days
1972	22 days
1973	23 days
1974	25 days
1975	18 days
1976	22 days
1977	17 days
1978	15 days
1979	14 days
1980	17 days
1981	16 days
1982	19 days
1983	17 days
1984	17 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

44 years with a frost

Across 44 years with a frost, the median last spring frost at Koln-Botanischer Garten falls on 13 April and the median first autumn frost on 8 November, which leaves a median of 217 days between them.

Fitted over all years, the growing season changes by +6.8 days per decade at this station.

Frost dates and growing season at Koln-Botanischer Garten
Measure	Median, all years	Earliest period	Recent period (1955 to 1984)	Recent against earliest	Fitted trend
Last spring frost	13 April	n/a	12 April	n/a	-2.5 days per decade
First autumn frost	8 November	n/a	9 November	n/a	+4.3 days per decade
Growing days	217 days	n/a	220 days	n/a	+6.8 days per decade

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

44 years, 1936 to 1984

A day with at least 32.6 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 83.3 mm (3.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Koln-Botanischer Garten: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	32.6 mm (1.3 in)
5 years	42.9 mm (1.7 in)
10 years	50.9 mm (2.0 in)
25 years	62.5 mm (2.5 in)
50 years	72.3 mm (2.8 in)	Longer than the 44 years of record
100 years	83.3 mm (3.3 in)	Longer than the 44 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, 44 years of values from 1936 to 1984.

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: 83.5 mm (3.3 in) in 1961; 68.3 mm (2.7 in) in 1936; 60.7 mm (2.4 in) in 1968.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Koln-Botanischer Garten, at 1962. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1962 ran 0.2 C (0.3 F) lower than in the years before (likely change).

Suspected changes in the annual mean temperature at Koln-Botanischer Garten, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1962	-0.2	-0.3	likely	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

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