Kirwin Dam Weather Records (USC00144357)

Record envelope, standing records and threshold days for Kirwin Dam (USC00144357), Kansas, United States, with 75 years of record.

Key Facts for Kirwin Dam

Kirwin Dam (USC00144357) is a weather station in Kansas, United States at 39.66 latitude and -99.12 longitude, 517 m (1,697 ft) above sea level.
The station reports from 1952 to 2026, 75 years of record.
1,464 records set at Kirwin Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Kirwin Dam tied a daily record high maximum temperature of 38.3 C (100.9 F) on 21 September 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: Kansas, United States, 39.66 latitude, -99.12 longitude.
Elevation: 517 m (1,697 ft).
Period of record: 1952 to 2026, 75 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

23 days at or beyond a record

The band shows the record high and record low for each calendar day at Kirwin Dam. The lines show the 2026 daily maximum and minimum. 23 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Kirwin Dam, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	24.4 C (75.9 F)	-34.4 C (-29.9 F)	21.7 C (71.1 F)	-24.4 C (-11.9 F)
Feb	30.0 C (86.0 F)	-32.8 C (-27.0 F)	26.7 C (80.1 F)	-12.8 C (9.0 F)
Mar	36.1 C (97.0 F)	-26.1 C (-15.0 F)	36.1 C (97.0 F)	-12.8 C (9.0 F)
Apr	38.9 C (102.0 F)	-12.8 C (9.0 F)	33.3 C (91.9 F)	-5.0 C (23.0 F)
May	38.9 C (102.0 F)	-3.9 C (25.0 F)	35.6 C (96.1 F)	-1.1 C (30.0 F)
Jun	46.7 C (116.1 F)	3.3 C (37.9 F)	38.3 C (100.9 F)	8.9 C (48.0 F)
Jul	45.0 C (113.0 F)	5.0 C (41.0 F)	42.2 C (108.0 F)	15.6 C (60.1 F)
Aug	43.3 C (109.9 F)	3.3 C (37.9 F)	41.7 C (107.1 F)	15.0 C (59.0 F)
Sep	42.8 C (109.0 F)	-9.4 C (15.1 F)	39.4 C (102.9 F)	13.3 C (55.9 F)
Oct	35.6 C (96.1 F)	-16.1 C (3.0 F)	n/a	n/a
Nov	31.1 C (88.0 F)	-23.3 C (-9.9 F)	n/a	n/a
Dec	27.2 C (81.0 F)	-32.2 C (-26.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Kirwin Dam still stand. 1953 holds the most, with 41.

Standing records at Kirwin Dam by the year they were set
Year set	Standing records
1952	40
1953	41
1954	37
1955	33
1956	19
1957	11
1958	11
1959	25
1960	24
1961	21
1962	37
1963	27
1964	31
1965	29
1966	33
1967	31
1968	25
1969	15
1970	20
1971	22
1972	30
1973	13
1974	24
1975	19
1976	15
1977	18
1978	20
1979	24
1980	22
1981	17
1982	11
1983	23
1984	20
1985	38
1986	13
1987	12
1988	20
1989	30
1990	16
1991	21
1992	16
1993	10
1994	16
1995	18
1996	21
1997	19
1998	20
1999	14
2000	15
2001	6
2002	13
2003	12
2004	19
2005	18
2006	13
2007	7
2008	5
2009	15
2010	6
2011	13
2012	31
2013	20
2014	13
2015	15
2016	8
2017	8
2018	11
2019	9
2020	20
2021	22
2022	18
2023	16
2024	14
2025	21
2026	24

All-Time Record Progression

4 new records

4 all-time records were set at Kirwin Dam between 13 September 1985 and 14 February 2021. Each dot is a new record.

When Kirwin Dam set new all-time records
Date	Kind	Detail
1985-09-13	Record daily precipitation	Record daily precipitation 124.5 mm (4.9 in)
2012-06-25	Record high maximum temperature	Record high maximum temperature 46.7 C (116.1 F)
2021-02-13	Record low maximum temperature	Record low maximum temperature -18.3 C (-0.9 F)
2021-02-14	Record low maximum temperature	Record low maximum temperature -21.1 C (-6.0 F)

Wettest Day of Each Month

Sep: 124.5 mm (4.9 in)

The wettest day on record for each calendar month at Kirwin Dam. The most was 124.5 mm (4.9 in) on 13 September 1985.

Record daily precipitation for each month at Kirwin Dam
Month	Record daily precipitation (mm)	Date
Jan	24.1 mm (0.9 in)	23 January 1965
Feb	40.1 mm (1.6 in)	19 February 1971
Mar	81.3 mm (3.2 in)	22 March 1979
Apr	67.3 mm (2.6 in)	7 April 1976
May	92.7 mm (3.6 in)	5 May 1960
Jun	62.2 mm (2.4 in)	14 June 1968
Jul	107.4 mm (4.2 in)	21 July 1985
Aug	110.7 mm (4.4 in)	12 August 1963
Sep	124.5 mm (4.9 in)	13 September 1985
Oct	71.1 mm (2.8 in)	22 October 2008
Nov	63.0 mm (2.5 in)	16 November 1996
Dec	36.3 mm (1.4 in)	3 December 1953

Period of Record Coverage

1952 to 2026

75 years of record at Kirwin Dam, 1952 to 2026. 31 years have data for under 90 percent of days and are left out of rankings: 1952, 1988, 1989, 1990, 1991, 1992, 1993, 1997 and others.

Days with data per year at Kirwin Dam
Year	Days with data	Share of year	Complete
1952	236	64%	No
1953	356	98%	Yes
1954	363	99%	Yes
1955	356	98%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	364	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	364	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	345	95%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	364	100%	Yes
1974	332	91%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	364	100%	Yes
1978	364	100%	Yes
1979	363	99%	Yes
1980	355	97%	Yes
1981	352	96%	Yes
1982	345	95%	Yes
1983	344	94%	Yes
1984	364	99%	Yes
1985	342	94%	Yes
1986	356	98%	Yes
1987	330	90%	Yes
1988	315	86%	No
1989	248	68%	No
1990	257	70%	No
1991	250	68%	No
1992	246	67%	No
1993	295	81%	No
1994	349	96%	Yes
1995	348	95%	Yes
1996	353	96%	Yes
1997	318	87%	No
1998	297	81%	No
1999	262	72%	No
2000	263	72%	No
2001	260	71%	No
2002	262	72%	No
2003	260	71%	No
2004	251	69%	No
2005	259	71%	No
2006	253	69%	No
2007	258	71%	No
2008	260	71%	No
2009	265	73%	No
2010	261	72%	No
2011	247	68%	No
2012	255	70%	No
2013	239	65%	No
2014	247	68%	No
2015	250	68%	No
2016	240	66%	No
2017	243	67%	No
2018	243	67%	No
2019	297	81%	No
2020	359	98%	Yes
2021	355	97%	Yes
2022	362	99%	Yes
2023	364	100%	Yes
2024	366	100%	Yes
2025	365	100%	Yes
2026	254	70%	No

Latest Records

Latest records at Kirwin Dam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 2026	Kirwin Dam, US	daily high max (Tie, Provisional)	38.3 C (100.9 F)	tie	4 years	2 of 100 (Routine)
7 September 2026	Kirwin Dam, US	daily high max (Tie, Provisional)	39.4 C (102.9 F)	tie	67 years	6 of 100 (Routine)
5 September 2026	Kirwin Dam, US	daily high min (Tie, Provisional)	21.7 C (71.1 F)	tie	24 years	3 of 100 (Routine)
16 August 2026	Kirwin Dam, US	daily rain (Provisional)	51.3 mm (2.0 in)	12.4 mm (0.5 in)	8 years	17 of 100 (Routine)
12 August 2026	Kirwin Dam, US	daily high max	41.7 C (107.1 F)	2.8 C (5.0 F)	31 years	22 of 100 (Routine)
11 August 2026	Kirwin Dam, US	daily high max (Tie)	40.6 C (105.1 F)	tie	61 years	6 of 100 (Routine)
11 August 2026	Kirwin Dam, US	daily high min (Tie)	22.2 C (72.0 F)	tie	43 years	4 of 100 (Routine)
6 August 2026	Kirwin Dam, US	daily low max	25.0 C (77.0 F)	0.6 C (1.1 F)	5 years	9 of 100 (Routine)
29 July 2026	Kirwin Dam, US	daily high min	23.3 C (73.9 F)	0.5 C (0.9 F)	39 years	19 of 100 (Routine)
27 July 2026	Kirwin Dam, US	daily high max	42.2 C (108.0 F)	1.6 C (2.9 F)	71 years	31 of 100 (Routine)
23 July 2026	Kirwin Dam, US	daily rain	28.4 mm (1.1 in)	17.7 mm (0.7 in)	57 years	37 of 100 (Notable)
29 June 2026	Kirwin Dam, US	daily high min (Tie)	24.4 C (75.9 F)	tie	63 years	6 of 100 (Routine)
25 June 2026	Kirwin Dam, US	daily rain (Tie)	26.4 mm (1.0 in)	tie	47 years	5 of 100 (Routine)
9 June 2026	Kirwin Dam, US	daily rain	48.5 mm (1.9 in)	2.8 mm (0.11 in)	52 years	24 of 100 (Routine)
4 June 2026	Kirwin Dam, US	daily rain	32.5 mm (1.3 in)	14.2 mm (0.6 in)	31 years	29 of 100 (Routine)
18 May 2026	Kirwin Dam, US	daily high max	35.6 C (96.1 F)	0.6 C (1.1 F)	61 years	26 of 100 (Routine)
16 May 2026	Kirwin Dam, US	daily high max	35.6 C (96.1 F)	0.6 C (1.1 F)	13 years	12 of 100 (Routine)
20 April 2026	Kirwin Dam, US	daily low min (Tie)	-5.0 C (23.0 F)	tie	72 years	7 of 100 (Routine)
19 April 2026	Kirwin Dam, US	daily low min (Tie)	-5.0 C (23.0 F)	tie	69 years	6 of 100 (Routine)
26 March 2026	Kirwin Dam, US	monthly high max (Tie)	36.1 C (97.0 F)	tie	0 years	4 of 100 (Routine)

Climate Trend

40 complete years, 1953 to 2025

One stripe for each of 40 complete years at Kirwin Dam, 1953 to 2025. Blue stripes are years cooler than the station's own mean of 11.3 C (52.4 F); red stripes are warmer. The coolest year was 1996, at 9.9 C (49.9 F), and the warmest was 1954, at 13.2 C (55.7 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Kirwin Dam as warming stripes, 1953 to 2025
Year	Annual mean temperature	Difference from the station mean
1953	13.1 C	+1.74 C
1954	13.2 C	+1.87 C
1955	11.6 C	+0.27 C
1956	11.7 C	+0.41 C
1957	10.7 C	-0.62 C
1958	11.0 C	-0.29 C
1959	11.2 C	-0.07 C
1960	10.4 C	-0.91 C
1961	10.5 C	-0.81 C
1962	11.6 C	+0.29 C
1963	12.5 C	+1.20 C
1964	11.7 C	+0.40 C
1965	11.0 C	-0.36 C
1966	10.9 C	-0.45 C
1967	10.8 C	-0.52 C
1968	11.0 C	-0.33 C
1969	10.6 C	-0.71 C
1970	11.0 C	-0.34 C
1971	10.8 C	-0.48 C
1972	10.3 C	-1.00 C
1973	11.0 C	-0.28 C
1975	10.5 C	-0.80 C
1976	11.1 C	-0.20 C
1977	12.0 C	+0.69 C
1978	10.1 C	-1.19 C
1979	10.2 C	-1.15 C
1980	11.5 C	+0.14 C
1981	12.1 C	+0.78 C
1984	10.4 C	-0.88 C
1986	12.1 C	+0.79 C
1994	10.9 C	-0.45 C
1995	10.5 C	-0.84 C
1996	9.9 C	-1.39 C
2005	11.7 C	+0.39 C
2006	12.3 C	+1.02 C
2021	11.8 C	+0.47 C
2022	11.4 C	+0.13 C
2023	12.2 C	+0.93 C
2024	12.8 C	+1.53 C
2025	12.2 C	+0.85 C

The fitted trend in annual mean temperature here over 1953 to 2025 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 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 Kirwin Dam
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.1 C (-0.1 to 0.2) per decade	0.1 F (-0.1 to 0.4) per decade	1953 to 2025	40	Not clearly different from zero
Mean daily maximum	0.2 C (0.1 to 0.4) per decade	0.4 F (0.1 to 0.7) per decade	1953 to 2025	40	Rise
Mean daily minimum	-0.1 C (-0.2 to 0.1) per decade	-0.1 F (-0.3 to 0.1) per decade	1953 to 2025	40	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

1952 to 2026

Yearly extremes at Kirwin Dam: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	46.7 C (116.1 F)	2012	41.1 C (106.0 F)	75
Coldest night (TNn)	-34.4 C (-29.9 F)	1974	-23.3 C (-9.9 F)	75
Wettest day (Rx1day)	124.5 mm (4.9 in)	1985	55.6 mm (2.2 in)	75
Wettest five days (Rx5day)	139.3 mm (5.5 in)	1961	71.7 mm (2.8 in)	75
Longest dry spell (CDD)	64 days	1966	35 days	75

Hottest day (TXx)

The hottest day of the year at Kirwin Dam, 1952 to 2026. The record is 46.7 C (116.1 F) in 2012, marked on the chart; the median year is 41.1 C (106.0 F).

Hottest day (TXx) at Kirwin Dam by year
Year	Hottest day (TXx)
1952	42.2 C (108.0 F)
1953	42.8 C (109.0 F)
1954	44.4 C (111.9 F)
1955	42.8 C (109.0 F)
1956	42.2 C (108.0 F)
1957	40.0 C (104.0 F)
1958	38.9 C (102.0 F)
1959	40.6 C (105.1 F)
1960	40.6 C (105.1 F)
1961	40.6 C (105.1 F)
1962	37.8 C (100.0 F)
1963	41.1 C (106.0 F)
1964	42.8 C (109.0 F)
1965	38.9 C (102.0 F)
1966	45.0 C (113.0 F)
1967	39.4 C (102.9 F)
1968	40.6 C (105.1 F)
1969	41.7 C (107.1 F)
1970	43.3 C (109.9 F)
1971	41.7 C (107.1 F)
1972	37.2 C (99.0 F)
1973	43.9 C (111.0 F)
1974	40.6 C (105.1 F)
1975	39.4 C (102.9 F)
1976	41.1 C (106.0 F)
1977	40.0 C (104.0 F)
1978	41.7 C (107.1 F)
1979	38.9 C (102.0 F)
1980	43.3 C (109.9 F)
1981	40.6 C (105.1 F)
1982	40.0 C (104.0 F)
1983	43.3 C (109.9 F)
1984	40.6 C (105.1 F)
1985	41.1 C (106.0 F)
1986	40.6 C (105.1 F)
1987	40.0 C (104.0 F)
1988	44.4 C (111.9 F)
1989	38.9 C (102.0 F)
1990	42.2 C (108.0 F)
1991	43.3 C (109.9 F)
1992	35.6 C (96.1 F)
1993	36.7 C (98.1 F)
1994	38.3 C (100.9 F)
1995	42.2 C (108.0 F)
1996	38.3 C (100.9 F)
1997	40.0 C (104.0 F)
1998	42.2 C (108.0 F)
1999	40.0 C (104.0 F)
2000	41.1 C (106.0 F)
2001	41.1 C (106.0 F)
2002	42.2 C (108.0 F)
2003	43.3 C (109.9 F)
2004	39.4 C (102.9 F)
2005	41.7 C (107.1 F)
2006	43.9 C (111.0 F)
2007	39.4 C (102.9 F)
2008	40.6 C (105.1 F)
2009	38.9 C (102.0 F)
2010	42.8 C (109.0 F)
2011	42.8 C (109.0 F)
2012	46.7 C (116.1 F)
2013	43.3 C (109.9 F)
2014	41.7 C (107.1 F)
2015	42.2 C (108.0 F)
2016	40.6 C (105.1 F)
2017	41.7 C (107.1 F)
2018	39.4 C (102.9 F)
2019	40.0 C (104.0 F)
2020	40.0 C (104.0 F)
2021	40.6 C (105.1 F)
2022	42.2 C (108.0 F)
2023	41.1 C (106.0 F)
2024	41.1 C (106.0 F)
2025	40.6 C (105.1 F)
2026	42.2 C (108.0 F)

Coldest night (TNn)

The coldest night of the year at Kirwin Dam, 1952 to 2026. The record is -34.4 C (-29.9 F) in 1974, marked on the chart; the median year is -23.3 C (-9.9 F).

Coldest night (TNn) at Kirwin Dam by year
Year	Coldest night (TNn)
1952	-20.6 C (-5.1 F)
1953	-20.0 C (-4.0 F)
1954	-21.1 C (-6.0 F)
1955	-22.2 C (-8.0 F)
1956	-23.3 C (-9.9 F)
1957	-23.9 C (-11.0 F)
1958	-20.0 C (-4.0 F)
1959	-28.3 C (-18.9 F)
1960	-26.1 C (-15.0 F)
1961	-32.2 C (-26.0 F)
1962	-26.1 C (-15.0 F)
1963	-26.7 C (-16.1 F)
1964	-24.4 C (-11.9 F)
1965	-23.9 C (-11.0 F)
1966	-28.9 C (-20.0 F)
1967	-23.9 C (-11.0 F)
1968	-25.6 C (-14.1 F)
1969	-23.9 C (-11.0 F)
1970	-23.3 C (-9.9 F)
1971	-28.9 C (-20.0 F)
1972	-25.0 C (-13.0 F)
1973	-22.2 C (-8.0 F)
1974	-34.4 C (-29.9 F)
1975	-22.2 C (-8.0 F)
1976	-23.3 C (-9.9 F)
1977	-23.9 C (-11.0 F)
1978	-26.1 C (-15.0 F)
1979	-25.6 C (-14.1 F)
1980	-27.2 C (-17.0 F)
1981	-28.9 C (-20.0 F)
1982	-25.6 C (-14.1 F)
1983	-19.4 C (-2.9 F)
1984	-26.7 C (-16.1 F)
1985	-26.7 C (-16.1 F)
1986	-23.3 C (-9.9 F)
1987	-16.1 C (3.0 F)
1988	-28.9 C (-20.0 F)
1989	-30.6 C (-23.1 F)
1990	-26.1 C (-15.0 F)
1991	-26.1 C (-15.0 F)
1992	-17.2 C (1.0 F)
1993	-23.3 C (-9.9 F)
1994	-22.2 C (-8.0 F)
1995	-22.2 C (-8.0 F)
1996	-24.4 C (-11.9 F)
1997	-21.7 C (-7.1 F)
1998	-23.3 C (-9.9 F)
1999	-20.0 C (-4.0 F)
2000	-19.4 C (-2.9 F)
2001	-24.4 C (-11.9 F)
2002	-20.0 C (-4.0 F)
2003	-20.0 C (-4.0 F)
2004	-22.2 C (-8.0 F)
2005	-21.7 C (-7.1 F)
2006	-18.3 C (-0.9 F)
2007	-22.2 C (-8.0 F)
2008	-22.8 C (-9.0 F)
2009	-23.3 C (-9.9 F)
2010	-24.4 C (-11.9 F)
2011	-23.3 C (-9.9 F)
2012	-17.2 C (1.0 F)
2013	-20.6 C (-5.1 F)
2014	-22.2 C (-8.0 F)
2015	-21.1 C (-6.0 F)
2016	-26.7 C (-16.1 F)
2017	-21.1 C (-6.0 F)
2018	-20.0 C (-4.0 F)
2019	-22.8 C (-9.0 F)
2020	-16.7 C (1.9 F)
2021	-32.8 C (-27.0 F)
2022	-24.4 C (-11.9 F)
2023	-20.0 C (-4.0 F)
2024	-25.6 C (-14.1 F)
2025	-28.3 C (-18.9 F)
2026	-24.4 C (-11.9 F)

Wettest day (Rx1day)

The wettest day of the year at Kirwin Dam, 1952 to 2026. The record is 124.5 mm (4.9 in) in 1985, marked on the chart; the median year is 55.6 mm (2.2 in).

Wettest day (Rx1day) at Kirwin Dam by year
Year	Wettest day (Rx1day)
1952	36.8 mm (1.4 in)
1953	36.3 mm (1.4 in)
1954	73.7 mm (2.9 in)
1955	57.9 mm (2.3 in)
1956	32.0 mm (1.3 in)
1957	55.6 mm (2.2 in)
1958	68.6 mm (2.7 in)
1959	67.6 mm (2.7 in)
1960	92.7 mm (3.6 in)
1961	65.3 mm (2.6 in)
1962	66.0 mm (2.6 in)
1963	110.7 mm (4.4 in)
1964	29.0 mm (1.1 in)
1965	62.2 mm (2.4 in)
1966	37.6 mm (1.5 in)
1967	67.6 mm (2.7 in)
1968	62.2 mm (2.4 in)
1969	71.1 mm (2.8 in)
1970	39.1 mm (1.5 in)
1971	41.9 mm (1.6 in)
1972	31.5 mm (1.2 in)
1973	59.4 mm (2.3 in)
1974	45.7 mm (1.8 in)
1975	55.9 mm (2.2 in)
1976	67.3 mm (2.6 in)
1977	38.1 mm (1.5 in)
1978	47.8 mm (1.9 in)
1979	81.3 mm (3.2 in)
1980	35.6 mm (1.4 in)
1981	48.3 mm (1.9 in)
1982	54.4 mm (2.1 in)
1983	51.8 mm (2.0 in)
1984	41.9 mm (1.6 in)
1985	124.5 mm (4.9 in)
1986	57.2 mm (2.3 in)
1987	75.4 mm (3.0 in)
1988	43.2 mm (1.7 in)
1989	45.7 mm (1.8 in)
1990	39.6 mm (1.6 in)
1991	44.2 mm (1.7 in)
1992	53.3 mm (2.1 in)
1993	61.2 mm (2.4 in)
1994	42.7 mm (1.7 in)
1995	91.4 mm (3.6 in)
1996	63.0 mm (2.5 in)
1997	34.0 mm (1.3 in)
1998	57.2 mm (2.3 in)
1999	98.0 mm (3.9 in)
2000	27.7 mm (1.1 in)
2001	71.1 mm (2.8 in)
2002	33.0 mm (1.3 in)
2003	69.9 mm (2.8 in)
2004	45.7 mm (1.8 in)
2005	72.4 mm (2.9 in)
2006	72.4 mm (2.9 in)
2007	63.5 mm (2.5 in)
2008	73.7 mm (2.9 in)
2009	38.1 mm (1.5 in)
2010	81.3 mm (3.2 in)
2011	88.9 mm (3.5 in)
2012	30.7 mm (1.2 in)
2013	31.0 mm (1.2 in)
2014	61.2 mm (2.4 in)
2015	51.1 mm (2.0 in)
2016	47.5 mm (1.9 in)
2017	60.5 mm (2.4 in)
2018	83.1 mm (3.3 in)
2019	35.8 mm (1.4 in)
2020	49.0 mm (1.9 in)
2021	37.3 mm (1.5 in)
2022	46.0 mm (1.8 in)
2023	70.6 mm (2.8 in)
2024	61.7 mm (2.4 in)
2025	41.1 mm (1.6 in)
2026	51.3 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Kirwin Dam, 1952 to 2026. The record is 139.3 mm (5.5 in) in 1961, marked on the chart; the median year is 71.7 mm (2.8 in).

Wettest five days (Rx5day) at Kirwin Dam by year
Year	Wettest five days (Rx5day)
1952	36.8 mm (1.4 in)
1953	39.9 mm (1.6 in)
1954	98.3 mm (3.9 in)
1955	98.6 mm (3.9 in)
1956	76.7 mm (3.0 in)
1957	94.6 mm (3.7 in)
1958	80.1 mm (3.2 in)
1959	78.6 mm (3.1 in)
1960	104.6 mm (4.1 in)
1961	139.3 mm (5.5 in)
1962	66.0 mm (2.6 in)
1963	123.4 mm (4.9 in)
1964	77.0 mm (3.0 in)
1965	111.8 mm (4.4 in)
1966	60.0 mm (2.4 in)
1967	133.3 mm (5.2 in)
1968	103.6 mm (4.1 in)
1969	90.4 mm (3.6 in)
1970	75.3 mm (3.0 in)
1971	54.3 mm (2.1 in)
1972	73.0 mm (2.9 in)
1973	100.7 mm (4.0 in)
1974	74.4 mm (2.9 in)
1975	88.9 mm (3.5 in)
1976	74.6 mm (2.9 in)
1977	58.4 mm (2.3 in)
1978	53.6 mm (2.1 in)
1979	108.4 mm (4.3 in)
1980	55.6 mm (2.2 in)
1981	68.7 mm (2.7 in)
1982	71.7 mm (2.8 in)
1983	98.2 mm (3.9 in)
1984	56.8 mm (2.2 in)
1985	136.4 mm (5.4 in)
1986	64.1 mm (2.5 in)
1987	98.0 mm (3.9 in)
1988	43.2 mm (1.7 in)
1989	48.5 mm (1.9 in)
1990	55.4 mm (2.2 in)
1991	44.2 mm (1.7 in)
1992	59.1 mm (2.3 in)
1993	88.4 mm (3.5 in)
1994	71.4 mm (2.8 in)
1995	119.3 mm (4.7 in)
1996	91.2 mm (3.6 in)
1997	50.3 mm (2.0 in)
1998	93.3 mm (3.7 in)
1999	110.5 mm (4.4 in)
2000	46.0 mm (1.8 in)
2001	72.6 mm (2.9 in)
2002	51.5 mm (2.0 in)
2003	72.4 mm (2.9 in)
2004	53.3 mm (2.1 in)
2005	72.4 mm (2.9 in)
2006	25.2 mm (1.0 in)
2007	44.0 mm (1.7 in)
2008	95.5 mm (3.8 in)
2009	55.8 mm (2.2 in)
2010	82.6 mm (3.3 in)
2011	125.5 mm (4.9 in)
2012	41.1 mm (1.6 in)
2013	35.3 mm (1.4 in)
2014	66.3 mm (2.6 in)
2015	52.9 mm (2.1 in)
2016	57.7 mm (2.3 in)
2017	71.9 mm (2.8 in)
2018	86.6 mm (3.4 in)
2019	60.8 mm (2.4 in)
2020	52.6 mm (2.1 in)
2021	38.6 mm (1.5 in)
2022	48.8 mm (1.9 in)
2023	70.6 mm (2.8 in)
2024	49.8 mm (2.0 in)
2025	51.8 mm (2.0 in)
2026	64.7 mm (2.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Kirwin Dam, 1952 to 2026. The record is 64 days in 1966, marked on the chart; the median year is 35 days.

Longest dry spell (CDD) at Kirwin Dam by year
Year	Longest dry spell (CDD)
1952	56 days
1953	42 days
1954	39 days
1955	44 days
1956	47 days
1957	42 days
1958	40 days
1959	61 days
1960	27 days
1961	28 days
1962	33 days
1963	50 days
1964	43 days
1965	52 days
1966	64 days
1967	59 days
1968	45 days
1969	25 days
1970	51 days
1971	39 days
1972	47 days
1973	26 days
1974	34 days
1975	35 days
1976	37 days
1977	30 days
1978	27 days
1979	38 days
1980	39 days
1981	30 days
1982	19 days
1983	50 days
1984	30 days
1985	25 days
1986	35 days
1987	34 days
1988	39 days
1989	24 days
1990	26 days
1991	39 days
1992	21 days
1993	27 days
1994	45 days
1995	48 days
1996	51 days
1997	34 days
1998	24 days
1999	45 days
2000	27 days
2001	24 days
2002	47 days
2003	34 days
2004	25 days
2005	32 days
2006	53 days
2007	36 days
2008	37 days
2009	45 days
2010	42 days
2011	6 days
2012	9 days
2013	15 days
2014	17 days
2015	18 days
2016	37 days
2017	32 days
2018	18 days
2019	18 days
2020	43 days
2021	38 days
2022	37 days
2023	22 days
2024	32 days
2025	32 days
2026	30 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

40 years with a frost

Across 40 years with a frost, the median last spring frost at Kirwin Dam falls on 29 April and the median first autumn frost on 9 October, which leaves a median of 165 days between them.

Fitted over all years, the growing season changes by +0.1 days per decade at this station.

Frost dates and growing season at Kirwin Dam
Measure	Median, all years	Earliest period	Recent period (1963 to 2025)	Recent against earliest	Fitted trend
Last spring frost	29 April	n/a	30 April	n/a	+0.1 days per decade
First autumn frost	9 October	n/a	9 October	n/a	+0.2 days per decade
Growing days	165 days	n/a	162 days	n/a	+0.1 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, 1953 to 2002

A day with at least 54.4 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 129.3 mm (5.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Kirwin Dam: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	54.4 mm (2.1 in)
5 years	74.4 mm (2.9 in)
10 years	87.6 mm (3.4 in)
25 years	104.4 mm (4.1 in)
50 years	116.9 mm (4.6 in)	Longer than the 44 years of record
100 years	129.3 mm (5.1 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 1953 to 2002.

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: 124.5 mm (4.9 in) in 1985; 110.7 mm (4.4 in) in 1963; 98.0 mm (3.9 in) in 1999.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Kirwin Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Kirwin Dam 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 2026-10-13. Last revised 13 October 2026 (2026-10-13).