Bunker 4N Weather Records (USC00231101)

Record envelope, standing records and threshold days for Bunker 4N (USC00231101), Missouri, United States, with 94 years of record.

Key Facts for Bunker 4N

Bunker 4N (USC00231101) is a weather station in Missouri, United States at 37.51 latitude and -91.19 longitude, 316 m (1,036 ft) above sea level.
The station reports from 1923 to 2016, 94 years of record.
1,464 records set at Bunker 4N still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Bunker 4N set a daily record precipitation of 57.2 mm (2.3 in) on 20 October 2016.

About the Station

Location: Missouri, United States, 37.51 latitude, -91.19 longitude.
Elevation: 316 m (1,036 ft).
Period of record: 1923 to 2016, 94 years.
Eligible elements: tmax, tmin, prcp, snow, 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 Bunker 4N. 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 Bunker 4N, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	23.3 C (73.9 F)	-31.7 C (-25.1 F)	n/a	n/a
Feb	26.7 C (80.1 F)	-27.8 C (-18.0 F)	n/a	n/a
Mar	30.0 C (86.0 F)	-19.4 C (-2.9 F)	n/a	n/a
Apr	33.3 C (91.9 F)	-10.6 C (12.9 F)	n/a	n/a
May	36.7 C (98.1 F)	-2.2 C (28.0 F)	n/a	n/a
Jun	37.2 C (99.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	42.2 C (108.0 F)	6.1 C (43.0 F)	n/a	n/a
Aug	41.1 C (106.0 F)	5.0 C (41.0 F)	n/a	n/a
Sep	37.8 C (100.0 F)	-1.7 C (28.9 F)	n/a	n/a
Oct	32.8 C (91.0 F)	-7.8 C (18.0 F)	n/a	n/a
Nov	28.9 C (84.0 F)	-17.8 C (0.0 F)	n/a	n/a
Dec	23.3 C (73.9 F)	-30.0 C (-22.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Bunker 4N still stand. 1980 holds the most, with 56.

Standing records at Bunker 4N by the year they were set
Year set	Standing records
1963	18
1964	34
1965	36
1966	35
1967	50
1968	31
1969	18
1970	40
1971	29
1972	32
1973	20
1974	43
1975	25
1976	34
1977	23
1978	37
1979	20
1980	56
1981	30
1982	31
1983	42
1984	24
1985	24
1986	43
1987	25
1988	34
1989	52
1990	33
1991	47
1992	12
1994	6
1995	29
1996	45
1997	37
1998	35
1999	13
2000	41
2001	26
2002	28
2003	33
2004	16
2005	15
2006	33
2007	21
2008	17
2009	6
2010	17
2011	9
2012	14
2013	20
2014	20
2015	5

All-Time Record Progression

2 new records

2 all-time records were set at Bunker 4N between 14 May 1983 and 7 January 2014. Each dot is a new record.

When Bunker 4N set new all-time records
Date	Kind	Detail
1983-05-14	Record daily precipitation	Record daily precipitation 298.2 mm (11.7 in)
2014-01-07	Record low maximum temperature	Record low maximum temperature -16.1 C (3.0 F)

Wettest Day of Each Month

May: 298.2 mm (11.7 in)

The wettest day on record for each calendar month at Bunker 4N. The most was 298.2 mm (11.7 in) on 14 May 1983.

Record daily precipitation for each month at Bunker 4N
Month	Record daily precipitation (mm)	Date
Jan	83.8 mm (3.3 in)	1 January 1948
Feb	152.4 mm (6.0 in)	5 February 2011
Mar	92.2 mm (3.6 in)	28 March 1977
Apr	110.2 mm (4.3 in)	3 April 1957
May	298.2 mm (11.7 in)	14 May 1983
Jun	108.0 mm (4.3 in)	10 June 1950
Jul	116.6 mm (4.6 in)	24 July 1973
Aug	117.3 mm (4.6 in)	7 August 2013
Sep	212.1 mm (8.4 in)	4 September 2008
Oct	86.9 mm (3.4 in)	3 October 2014
Nov	105.7 mm (4.2 in)	19 November 1985
Dec	103.4 mm (4.1 in)	10 December 1971

Period of Record Coverage

1963 to 2015

52 years of record at Bunker 4N, 1963 to 2015. 22 years have data for under 90 percent of days and are left out of rankings: 1963, 1986, 1990, 1992, 1994, 1999, 2000, 2001 and others.

Days with data per year at Bunker 4N
Year	Days with data	Share of year	Complete
1963	122	33%	No
1964	365	100%	Yes
1965	348	95%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	359	98%	Yes
1971	365	100%	Yes
1972	365	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	363	99%	Yes
1976	366	100%	Yes
1977	358	98%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	363	99%	Yes
1983	362	99%	Yes
1984	362	99%	Yes
1985	329	90%	Yes
1986	317	87%	No
1987	353	97%	Yes
1988	364	99%	Yes
1989	362	99%	Yes
1990	307	84%	No
1991	352	96%	Yes
1992	208	57%	No
1994	121	33%	No
1995	343	94%	Yes
1996	360	98%	Yes
1997	343	94%	Yes
1998	348	95%	Yes
1999	282	77%	No
2000	178	49%	No
2001	205	56%	No
2002	272	75%	No
2003	274	75%	No
2004	238	65%	No
2005	155	42%	No
2006	209	57%	No
2007	212	58%	No
2008	196	54%	No
2009	102	28%	No
2010	185	51%	No
2011	109	30%	No
2012	105	29%	No
2013	131	36%	No
2014	86	24%	No
2015	28	8%	No

Latest Records

Latest records at Bunker 4N
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 October 2016	Bunker 4N, US	daily rain	57.2 mm (2.3 in)	32.6 mm (1.3 in)	33 years	39 of 100 (Notable)
17 September 2016	Bunker 4N, US	daily rain	120.7 mm (4.8 in)	85.9 mm (3.4 in)	48 years	63 of 100 (Major)
4 June 2016	Bunker 4N, US	daily rain	41.1 mm (1.6 in)	8.6 mm (0.34 in)	31 years	23 of 100 (Routine)
24 August 2015	Bunker 4N, US	daily low min	8.9 C (48.0 F)	1.7 C (3.1 F)	30 years	19 of 100 (Routine)
10 August 2015	Bunker 4N, US	daily rain	114.3 mm (4.5 in)	70.1 mm (2.8 in)	74 years	71 of 100 (Major)
7 July 2015	Bunker 4N, US	daily rain	54.6 mm (2.1 in)	30.0 mm (1.2 in)	28 years	33 of 100 (Routine)
19 June 2015	Bunker 4N, US	daily rain	76.2 mm (3.0 in)	25.4 mm (1.0 in)	4 years	27 of 100 (Routine)
22 May 2015	Bunker 4N, US	daily low min	1.1 C (34.0 F)	1.1 C (2.0 F)	13 years	11 of 100 (Routine)
15 May 2015	Bunker 4N, US	daily low min (Tie)	1.7 C (35.1 F)	tie	33 years	3 of 100 (Routine)
27 March 2015	Bunker 4N, US	daily rain	37.6 mm (1.5 in)	6.6 mm (0.26 in)	37 years	24 of 100 (Routine)
6 March 2015	Bunker 4N, US	daily snowfall	9.7 cm (3.8 in)	9.7 cm (3.8 in)	90 years	50 of 100 (Notable)
1 March 2015	Bunker 4N, US	daily snowfall	5.1 cm (2.0 in)	2.6 cm (1.0 in)	68 years	32 of 100 (Routine)
21 February 2015	Bunker 4N, US	monthly low min	-27.8 C (-18.0 F)	1.1 C (2.0 F)	4 years	17 of 100 (Routine)
16 February 2015	Bunker 4N, US	monthly snowfall	15.7 cm (6.2 in)	0.5 cm (0.2 in)	54 years	36 of 100 (Notable)
14 February 2015	Bunker 4N, US	daily high max	21.1 C (70.0 F)	1.7 C (3.1 F)	43 years	19 of 100 (Routine)
12 January 2015	Bunker 4N, US	daily low min	-20.6 C (-5.1 F)	0.6 C (1.1 F)	17 years	10 of 100 (Routine)
29 October 2014	Bunker 4N, US	daily high max	28.3 C (82.9 F)	1.1 C (2.0 F)	15 years	11 of 100 (Routine)
10 October 2014	Bunker 4N, US	daily rain	60.5 mm (2.4 in)	33.8 mm (1.3 in)	15 years	36 of 100 (Notable)
3 October 2014	Bunker 4N, US	monthly rain	86.9 mm (3.4 in)	11.5 mm (0.5 in)	28 years	35 of 100 (Notable)
17 July 2014	Bunker 4N, US	daily low min	8.9 C (48.0 F)	2.8 C (5.0 F)	12 years	17 of 100 (Routine)

Climate Trend

24 complete years, 1964 to 1998

One stripe for each of 24 complete years at Bunker 4N, 1964 to 1998. Blue stripes are years cooler than the station's own mean of 13.0 C (55.4 F); red stripes are warmer. The coolest year was 1996, at 11.2 C (52.2 F), and the warmest was 1991, at 14.5 C (58.1 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Bunker 4N as warming stripes, 1964 to 1998
Year	Annual mean temperature	Difference from the station mean
1964	13.6 C	+0.62 C
1966	12.7 C	-0.28 C
1967	13.3 C	+0.29 C
1968	12.8 C	-0.20 C
1969	13.1 C	+0.04 C
1970	13.2 C	+0.18 C
1971	13.7 C	+0.72 C
1972	13.1 C	+0.13 C
1973	13.7 C	+0.68 C
1974	13.5 C	+0.44 C
1975	14.0 C	+1.03 C
1978	12.4 C	-0.58 C
1979	12.0 C	-0.99 C
1980	13.6 C	+0.54 C
1981	13.2 C	+0.15 C
1982	12.4 C	-0.60 C
1983	12.3 C	-0.69 C
1984	13.0 C	-0.03 C
1987	13.0 C	+0.00 C
1988	12.2 C	-0.85 C
1989	11.6 C	-1.38 C
1991	14.5 C	+1.51 C
1996	11.2 C	-1.78 C
1998	14.1 C	+1.04 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

1923 to 2016

Yearly extremes at Bunker 4N: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.2 C (108.0 F)	1980	36.7 C (98.1 F)	52
Coldest night (TNn)	-31.7 C (-25.1 F)	1985	-20.0 C (-4.0 F)	52
Wettest day (Rx1day)	298.2 mm (11.7 in)	1983	74.0 mm (2.9 in)	78
Wettest five days (Rx5day)	312.2 mm (12.3 in)	1983	100.3 mm (3.9 in)	78
Longest dry spell (CDD)	58 days	1989	23 days	78

Hottest day (TXx)

The hottest day of the year at Bunker 4N, 1923 to 2016. The record is 42.2 C (108.0 F) in 1980, marked on the chart; the median year is 36.7 C (98.1 F).

Hottest day (TXx) at Bunker 4N by year
Year	Hottest day (TXx)
1923	n/a
1924	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	32.8 C (91.0 F)
1964	38.9 C (102.0 F)
1965	36.1 C (97.0 F)
1966	38.9 C (102.0 F)
1967	33.9 C (93.0 F)
1968	33.3 C (91.9 F)
1969	38.3 C (100.9 F)
1970	35.6 C (96.1 F)
1971	36.7 C (98.1 F)
1972	35.6 C (96.1 F)
1973	33.9 C (93.0 F)
1974	37.2 C (99.0 F)
1975	36.1 C (97.0 F)
1976	36.7 C (98.1 F)
1977	36.1 C (97.0 F)
1978	36.7 C (98.1 F)
1979	33.9 C (93.0 F)
1980	42.2 C (108.0 F)
1981	36.1 C (97.0 F)
1982	36.1 C (97.0 F)
1983	38.3 C (100.9 F)
1984	38.9 C (102.0 F)
1985	36.1 C (97.0 F)
1986	37.2 C (99.0 F)
1987	36.1 C (97.0 F)
1988	37.2 C (99.0 F)
1989	33.3 C (91.9 F)
1990	36.7 C (98.1 F)
1991	38.9 C (102.0 F)
1992	32.2 C (90.0 F)
1994	32.8 C (91.0 F)
1995	37.2 C (99.0 F)
1996	34.4 C (93.9 F)
1997	37.8 C (100.0 F)
1998	35.6 C (96.1 F)
1999	38.3 C (100.9 F)
2000	38.3 C (100.9 F)
2001	36.7 C (98.1 F)
2002	36.7 C (98.1 F)
2003	36.7 C (98.1 F)
2004	35.0 C (95.0 F)
2005	36.7 C (98.1 F)
2006	36.7 C (98.1 F)
2007	40.6 C (105.1 F)
2008	35.6 C (96.1 F)
2009	35.6 C (96.1 F)
2010	37.2 C (99.0 F)
2011	38.3 C (100.9 F)
2012	39.4 C (102.9 F)
2013	34.4 C (93.9 F)
2014	34.4 C (93.9 F)
2015	34.4 C (93.9 F)
2016	n/a

Coldest night (TNn)

The coldest night of the year at Bunker 4N, 1923 to 2016. The record is -31.7 C (-25.1 F) in 1985, marked on the chart; the median year is -20.0 C (-4.0 F).

Coldest night (TNn) at Bunker 4N by year
Year	Coldest night (TNn)
1923	n/a
1924	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	-18.3 C (-0.9 F)
1964	-16.1 C (3.0 F)
1965	-21.1 C (-6.0 F)
1966	-22.2 C (-8.0 F)
1967	-17.8 C (0.0 F)
1968	-22.8 C (-9.0 F)
1969	-17.8 C (0.0 F)
1970	-22.2 C (-8.0 F)
1971	-18.9 C (-2.0 F)
1972	-21.7 C (-7.1 F)
1973	-16.1 C (3.0 F)
1974	-21.1 C (-6.0 F)
1975	-16.1 C (3.0 F)
1976	-20.0 C (-4.0 F)
1977	-19.4 C (-2.9 F)
1978	-20.6 C (-5.1 F)
1979	-23.3 C (-9.9 F)
1980	-20.0 C (-4.0 F)
1981	-24.4 C (-11.9 F)
1982	-25.6 C (-14.1 F)
1983	-28.3 C (-18.9 F)
1984	-23.9 C (-11.0 F)
1985	-31.7 C (-25.1 F)
1986	-20.6 C (-5.1 F)
1987	-15.6 C (3.9 F)
1988	-25.6 C (-14.1 F)
1989	-30.0 C (-22.0 F)
1990	-17.8 C (0.0 F)
1991	-15.0 C (5.0 F)
1992	-16.1 C (3.0 F)
1994	-10.6 C (12.9 F)
1995	-18.3 C (-0.9 F)
1996	-23.3 C (-9.9 F)
1997	-20.6 C (-5.1 F)
1998	-16.7 C (1.9 F)
1999	-8.9 C (16.0 F)
2000	-12.8 C (9.0 F)
2001	-16.1 C (3.0 F)
2002	-26.1 C (-15.0 F)
2003	-24.4 C (-11.9 F)
2004	-18.9 C (-2.0 F)
2005	-12.8 C (9.0 F)
2006	-17.8 C (0.0 F)
2007	-22.2 C (-8.0 F)
2008	-18.9 C (-2.0 F)
2009	-20.0 C (-4.0 F)
2010	-16.1 C (3.0 F)
2011	-26.7 C (-16.1 F)
2012	-17.8 C (0.0 F)
2013	-17.2 C (1.0 F)
2014	-29.4 C (-20.9 F)
2015	-27.8 C (-18.0 F)
2016	n/a

Wettest day (Rx1day)

The wettest day of the year at Bunker 4N, 1923 to 2016. The record is 298.2 mm (11.7 in) in 1983, marked on the chart; the median year is 74.0 mm (2.9 in).

Wettest day (Rx1day) at Bunker 4N by year
Year	Wettest day (Rx1day)
1923	57.7 mm (2.3 in)
1924	65.5 mm (2.6 in)
1940	53.6 mm (2.1 in)
1941	119.4 mm (4.7 in)
1942	50.8 mm (2.0 in)
1943	50.8 mm (2.0 in)
1944	61.2 mm (2.4 in)
1945	91.9 mm (3.6 in)
1946	91.4 mm (3.6 in)
1947	50.8 mm (2.0 in)
1948	83.8 mm (3.3 in)
1949	61.0 mm (2.4 in)
1950	108.0 mm (4.3 in)
1951	114.3 mm (4.5 in)
1952	68.6 mm (2.7 in)
1953	35.1 mm (1.4 in)
1954	42.7 mm (1.7 in)
1955	54.1 mm (2.1 in)
1956	83.8 mm (3.3 in)
1957	110.2 mm (4.3 in)
1958	85.3 mm (3.4 in)
1959	58.2 mm (2.3 in)
1960	41.7 mm (1.6 in)
1961	69.9 mm (2.8 in)
1962	82.6 mm (3.3 in)
1963	76.5 mm (3.0 in)
1964	73.4 mm (2.9 in)
1965	121.2 mm (4.8 in)
1966	111.0 mm (4.4 in)
1967	65.5 mm (2.6 in)
1968	73.7 mm (2.9 in)
1969	55.1 mm (2.2 in)
1970	74.9 mm (2.9 in)
1971	103.4 mm (4.1 in)
1972	74.7 mm (2.9 in)
1973	116.6 mm (4.6 in)
1974	87.1 mm (3.4 in)
1975	55.4 mm (2.2 in)
1976	79.8 mm (3.1 in)
1977	92.2 mm (3.6 in)
1978	41.9 mm (1.6 in)
1979	101.6 mm (4.0 in)
1980	38.1 mm (1.5 in)
1981	54.1 mm (2.1 in)
1982	71.6 mm (2.8 in)
1983	298.2 mm (11.7 in)
1984	108.7 mm (4.3 in)
1985	105.7 mm (4.2 in)
1986	75.4 mm (3.0 in)
1987	60.2 mm (2.4 in)
1988	77.5 mm (3.1 in)
1989	54.4 mm (2.1 in)
1990	45.7 mm (1.8 in)
1991	77.0 mm (3.0 in)
1992	42.4 mm (1.7 in)
1994	50.8 mm (2.0 in)
1995	50.8 mm (2.0 in)
1996	76.2 mm (3.0 in)
1997	63.5 mm (2.5 in)
1998	58.4 mm (2.3 in)
1999	58.4 mm (2.3 in)
2000	33.0 mm (1.3 in)
2001	82.6 mm (3.3 in)
2002	102.1 mm (4.0 in)
2003	74.2 mm (2.9 in)
2004	51.3 mm (2.0 in)
2005	73.7 mm (2.9 in)
2006	66.3 mm (2.6 in)
2007	50.8 mm (2.0 in)
2008	212.1 mm (8.4 in)
2009	117.3 mm (4.6 in)
2010	58.4 mm (2.3 in)
2011	152.4 mm (6.0 in)
2012	101.6 mm (4.0 in)
2013	117.3 mm (4.6 in)
2014	86.9 mm (3.4 in)
2015	114.3 mm (4.5 in)
2016	120.7 mm (4.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Bunker 4N, 1923 to 2016. The record is 312.2 mm (12.3 in) in 1983, marked on the chart; the median year is 100.3 mm (3.9 in).

Wettest five days (Rx5day) at Bunker 4N by year
Year	Wettest five days (Rx5day)
1923	86.1 mm (3.4 in)
1924	90.9 mm (3.6 in)
1940	94.8 mm (3.7 in)
1941	119.4 mm (4.7 in)
1942	57.6 mm (2.3 in)
1943	146.6 mm (5.8 in)
1944	70.6 mm (2.8 in)
1945	222.0 mm (8.7 in)
1946	173.2 mm (6.8 in)
1947	90.2 mm (3.6 in)
1948	83.8 mm (3.3 in)
1949	89.0 mm (3.5 in)
1950	111.8 mm (4.4 in)
1951	199.9 mm (7.9 in)
1952	111.8 mm (4.4 in)
1953	59.5 mm (2.3 in)
1954	46.5 mm (1.8 in)
1955	75.3 mm (3.0 in)
1956	100.3 mm (3.9 in)
1957	129.8 mm (5.1 in)
1958	154.9 mm (6.1 in)
1959	93.4 mm (3.7 in)
1960	64.5 mm (2.5 in)
1961	172.3 mm (6.8 in)
1962	125.5 mm (4.9 in)
1963	116.4 mm (4.6 in)
1964	110.0 mm (4.3 in)
1965	145.6 mm (5.7 in)
1966	126.5 mm (5.0 in)
1967	92.9 mm (3.7 in)
1968	95.7 mm (3.8 in)
1969	88.4 mm (3.5 in)
1970	113.6 mm (4.5 in)
1971	138.2 mm (5.4 in)
1972	161.1 mm (6.3 in)
1973	210.6 mm (8.3 in)
1974	116.3 mm (4.6 in)
1975	69.8 mm (2.7 in)
1976	79.8 mm (3.1 in)
1977	123.2 mm (4.9 in)
1978	76.7 mm (3.0 in)
1979	137.6 mm (5.4 in)
1980	58.1 mm (2.3 in)
1981	109.7 mm (4.3 in)
1982	127.4 mm (5.0 in)
1983	312.2 mm (12.3 in)
1984	170.9 mm (6.7 in)
1985	159.6 mm (6.3 in)
1986	108.7 mm (4.3 in)
1987	125.0 mm (4.9 in)
1988	82.1 mm (3.2 in)
1989	97.8 mm (3.9 in)
1990	80.7 mm (3.2 in)
1991	77.0 mm (3.0 in)
1992	42.4 mm (1.7 in)
1994	122.4 mm (4.8 in)
1995	100.3 mm (3.9 in)
1996	121.9 mm (4.8 in)
1997	76.2 mm (3.0 in)
1998	130.8 mm (5.1 in)
1999	83.8 mm (3.3 in)
2000	66.8 mm (2.6 in)
2001	82.6 mm (3.3 in)
2002	151.4 mm (6.0 in)
2003	75.5 mm (3.0 in)
2004	57.2 mm (2.3 in)
2005	89.2 mm (3.5 in)
2006	67.9 mm (2.7 in)
2007	74.6 mm (2.9 in)
2008	212.1 mm (8.4 in)
2009	161.0 mm (6.3 in)
2010	80.5 mm (3.2 in)
2011	19.8 mm (0.8 in)
2012	60.2 mm (2.4 in)
2013	195.6 mm (7.7 in)
2014	86.9 mm (3.4 in)
2015	142.2 mm (5.6 in)
2016	120.7 mm (4.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Bunker 4N, 1923 to 2016. The record is 58 days in 1989, marked on the chart; the median year is 23 days.

Longest dry spell (CDD) at Bunker 4N by year
Year	Longest dry spell (CDD)
1923	27 days
1924	26 days
1940	15 days
1941	30 days
1942	25 days
1943	27 days
1944	29 days
1945	19 days
1946	18 days
1947	39 days
1948	21 days
1949	47 days
1950	26 days
1951	26 days
1952	40 days
1953	21 days
1954	13 days
1955	22 days
1956	18 days
1957	23 days
1958	32 days
1959	35 days
1960	18 days
1961	15 days
1962	24 days
1963	52 days
1964	30 days
1965	35 days
1966	48 days
1967	29 days
1968	36 days
1969	22 days
1970	38 days
1971	28 days
1972	28 days
1973	20 days
1974	55 days
1975	15 days
1976	31 days
1977	19 days
1978	17 days
1979	25 days
1980	29 days
1981	21 days
1982	16 days
1983	31 days
1984	21 days
1985	18 days
1986	22 days
1987	18 days
1988	36 days
1989	58 days
1990	27 days
1991	27 days
1992	22 days
1994	18 days
1995	23 days
1996	21 days
1997	19 days
1998	33 days
1999	21 days
2000	35 days
2001	21 days
2002	20 days
2003	14 days
2004	24 days
2005	17 days
2006	14 days
2007	17 days
2008	21 days
2009	29 days
2010	31 days
2011	4 days
2012	16 days
2013	15 days
2014	20 days
2015	19 days
2016	19 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 Bunker 4N falls on 11 April and the median first autumn frost on 13 October, which leaves a median of 184 days between them.

Frost dates and growing season at Bunker 4N
Measure	Median, all years	Earliest period	Recent period (1964 to 1998)	Recent against earliest	Fitted trend
Last spring frost	11 April	n/a	11 April	n/a	n/a
First autumn frost	13 October	n/a	13 October	n/a	n/a
Growing days	184 days	n/a	184 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

46 years, 1924 to 2014

A day with at least 73.5 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 211.8 mm (8.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Bunker 4N: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	73.5 mm (2.9 in)
5 years	99.2 mm (3.9 in)
10 years	120.1 mm (4.7 in)
25 years	151.6 mm (6.0 in)
50 years	179.6 mm (7.1 in)	Longer than the 46 years of record
100 years	211.8 mm (8.3 in)	Longer than the 46 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, 46 years of values from 1924 to 2014.

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: 298.2 mm (11.7 in) in 1983; 121.2 mm (4.8 in) in 1965; 116.6 mm (4.6 in) in 1973.

Download the Data

Data for Bunker 4N standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Bunker 4N 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).