Callahan Weather Records (USC00041316)

Record envelope, standing records and threshold days for Callahan (USC00041316), California, United States, with 76 years of record.

Key Facts for Callahan

Callahan (USC00041316) is a weather station in California, United States at 41.34 latitude and -122.82 longitude, 940 m (3,085 ft) above sea level.
The station reports from 1943 to 2018, 76 years of record.
1,464 records set at Callahan still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Callahan set a daily record precipitation of 24.9 mm (1.0 in) on 27 November 2018.

About the Station

Location: California, United States, 41.34 latitude, -122.82 longitude.
Elevation: 940 m (3,085 ft).
Period of record: 1943 to 2018, 76 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 Callahan. 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 Callahan, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	18.3 C (64.9 F)	-21.1 C (-6.0 F)	n/a	n/a
Feb	22.2 C (72.0 F)	-18.3 C (-0.9 F)	n/a	n/a
Mar	27.8 C (82.0 F)	-15.6 C (3.9 F)	n/a	n/a
Apr	30.0 C (86.0 F)	-7.8 C (18.0 F)	n/a	n/a
May	36.7 C (98.1 F)	-6.1 C (21.0 F)	n/a	n/a
Jun	39.4 C (102.9 F)	-6.1 C (21.0 F)	n/a	n/a
Jul	41.1 C (106.0 F)	-1.7 C (28.9 F)	n/a	n/a
Aug	40.6 C (105.1 F)	0.0 C (32.0 F)	n/a	n/a
Sep	40.6 C (105.1 F)	-5.0 C (23.0 F)	n/a	n/a
Oct	32.8 C (91.0 F)	-9.4 C (15.1 F)	n/a	n/a
Nov	23.9 C (75.0 F)	-12.8 C (9.0 F)	n/a	n/a
Dec	18.3 C (64.9 F)	-22.8 C (-9.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Callahan still stand. 1955 holds the most, with 47.

Standing records at Callahan by the year they were set
Year set	Standing records
1953	27
1954	36
1955	47
1956	25
1957	36
1958	19
1959	35
1960	45
1961	31
1962	23
1963	24
1964	30
1965	25
1966	28
1967	35
1968	29
1969	15
1970	26
1971	13
1972	33
1973	8
1974	28
1975	20
1976	25
1977	32
1978	22
1979	18
1980	20
1981	22
1982	22
1983	15
1984	16
1985	29
1986	35
1987	15
1988	19
1989	23
1990	27
1991	15
1992	18
1993	19
1994	10
1995	36
1996	20
1997	16
1998	15
1999	22
2000	10
2001	9
2002	20
2003	15
2004	8
2005	17
2006	16
2007	14
2008	24
2009	12
2010	15
2011	13
2012	16
2013	20
2014	15
2015	21
2016	24
2017	33
2018	13

All-Time Record Progression

1 new records

1 all-time records were set at Callahan between 22 July 1985 and 22 July 1985. Each dot is a new record.

Wettest Day of Each Month

Dec: 125.2 mm (4.9 in)

The wettest day on record for each calendar month at Callahan. The most was 125.2 mm (4.9 in) on 22 December 1964.

Record daily precipitation for each month at Callahan
Month	Record daily precipitation (mm)	Date
Jan	110.7 mm (4.4 in)	9 January 1995
Feb	115.6 mm (4.6 in)	6 February 2015
Mar	56.6 mm (2.2 in)	9 March 1995
Apr	46.0 mm (1.8 in)	14 April 1957
May	47.2 mm (1.9 in)	18 May 2005
Jun	30.7 mm (1.2 in)	11 June 1998
Jul	38.6 mm (1.5 in)	4 July 2013
Aug	63.8 mm (2.5 in)	2 August 2003
Sep	55.4 mm (2.2 in)	25 September 2014
Oct	77.5 mm (3.1 in)	24 October 2010
Nov	76.7 mm (3.0 in)	8 November 1954
Dec	125.2 mm (4.9 in)	22 December 1964

Period of Record Coverage

1953 to 2018

66 years of record at Callahan, 1953 to 2018. 3 years have data for under 90 percent of days and are left out of rankings: 1953, 1971, 2018.

Days with data per year at Callahan
Year	Days with data	Share of year	Complete
1953	274	75%	No
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	360	99%	Yes
1958	364	100%	Yes
1959	363	99%	Yes
1960	364	99%	Yes
1961	363	99%	Yes
1962	360	99%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	364	100%	Yes
1966	329	90%	Yes
1967	358	98%	Yes
1968	356	97%	Yes
1969	358	98%	Yes
1970	329	90%	Yes
1971	180	49%	No
1972	365	100%	Yes
1973	363	99%	Yes
1974	365	100%	Yes
1975	359	98%	Yes
1976	364	99%	Yes
1977	362	99%	Yes
1978	365	100%	Yes
1979	364	100%	Yes
1980	362	99%	Yes
1981	363	99%	Yes
1982	359	98%	Yes
1983	361	99%	Yes
1984	363	99%	Yes
1985	361	99%	Yes
1986	362	99%	Yes
1987	363	99%	Yes
1988	365	100%	Yes
1989	365	100%	Yes
1990	357	98%	Yes
1991	365	100%	Yes
1992	364	99%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	362	99%	Yes
1996	366	100%	Yes
1997	364	100%	Yes
1998	362	99%	Yes
1999	364	100%	Yes
2000	365	100%	Yes
2001	365	100%	Yes
2002	364	100%	Yes
2003	364	100%	Yes
2004	364	99%	Yes
2005	360	99%	Yes
2006	363	99%	Yes
2007	363	99%	Yes
2008	364	99%	Yes
2009	363	99%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	338	92%	Yes
2013	365	100%	Yes
2014	364	100%	Yes
2015	365	100%	Yes
2016	366	100%	Yes
2017	364	100%	Yes
2018	324	89%	No

Latest Records

Latest records at Callahan
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
27 November 2018	Callahan, US	daily rain	24.9 mm (1.0 in)	2.0 mm (0.08 in)	33 years	19 of 100 (Routine)
27 November 2018	Callahan, US	daily high min	5.0 C (41.0 F)	0.6 C (1.1 F)	32 years	16 of 100 (Routine)
16 November 2018	Callahan, US	daily high max (Tie)	16.7 C (62.1 F)	tie	7 years	2 of 100 (Routine)
9 November 2018	Callahan, US	daily low min	-9.4 C (15.1 F)	0.5 C (0.9 F)	5 years	8 of 100 (Routine)
8 November 2018	Callahan, US	daily low min	-8.3 C (17.1 F)	1.6 C (2.9 F)	7 years	11 of 100 (Routine)
4 October 2018	Callahan, US	daily high min	10.6 C (51.1 F)	1.2 C (2.2 F)	24 years	16 of 100 (Routine)
15 July 2018	Callahan, US	daily rain	11.4 mm (0.4 in)	6.6 mm (0.26 in)	43 years	20 of 100 (Routine)
14 July 2018	Callahan, US	daily high min	16.7 C (62.1 F)	1.1 C (2.0 F)	28 years	17 of 100 (Routine)
10 June 2018	Callahan, US	daily low min (Tie)	0.0 C (32.0 F)	tie	9 years	2 of 100 (Routine)
25 May 2018	Callahan, US	daily high min (Tie)	10.6 C (51.1 F)	tie	48 years	5 of 100 (Routine)
24 May 2018	Callahan, US	daily rain	7.6 mm (0.30 in)	1.0 mm (0.04 in)	31 years	17 of 100 (Routine)
23 May 2018	Callahan, US	daily high min	12.8 C (55.0 F)	3.4 C (6.1 F)	33 years	25 of 100 (Routine)
17 May 2018	Callahan, US	daily high min (Tie)	10.6 C (51.1 F)	tie	44 years	4 of 100 (Routine)
16 May 2018	Callahan, US	daily rain	18.8 mm (0.7 in)	10.2 mm (0.4 in)	45 years	20 of 100 (Routine)
5 April 2018	Callahan, US	daily high min (Tie)	9.4 C (48.9 F)	tie	0 years	1 of 100 (Routine)
14 March 2018	Callahan, US	daily rain	22.9 mm (0.9 in)	1.3 mm (0.05 in)	15 years	12 of 100 (Routine)
2 March 2018	Callahan, US	monthly low max (Tie)	1.7 C (35.1 F)	tie	61 years	8 of 100 (Routine)
20 February 2018	Callahan, US	daily low min	-11.7 C (10.9 F)	1.7 C (3.1 F)	12 years	13 of 100 (Routine)
19 February 2018	Callahan, US	daily low max	2.8 C (37.0 F)	0.5 C (0.9 F)	28 years	15 of 100 (Routine)
8 February 2018	Callahan, US	daily high max	18.9 C (66.0 F)	1.7 C (3.1 F)	22 years	16 of 100 (Routine)

Climate Trend

60 complete years, 1954 to 2017

One stripe for each of 60 complete years at Callahan, 1954 to 2017. Blue stripes are years cooler than the station's own mean of 10.3 C (50.6 F); red stripes are warmer. The coolest year was 1982, at 9.2 C (48.6 F), and the warmest was 2016, at 11.6 C (52.9 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at Callahan as warming stripes, 1954 to 2017
Year	Annual mean temperature	Difference from the station mean
1954	10.4 C	+0.08 C
1955	10.0 C	-0.36 C
1956	10.4 C	+0.04 C
1957	9.7 C	-0.63 C
1958	11.0 C	+0.67 C
1959	10.9 C	+0.51 C
1960	10.6 C	+0.26 C
1961	10.7 C	+0.30 C
1962	10.5 C	+0.15 C
1963	10.5 C	+0.14 C
1964	10.2 C	-0.20 C
1965	10.5 C	+0.11 C
1967	10.5 C	+0.18 C
1968	10.7 C	+0.36 C
1969	10.3 C	-0.01 C
1972	9.8 C	-0.53 C
1973	10.5 C	+0.11 C
1974	10.0 C	-0.35 C
1975	9.4 C	-0.96 C
1976	9.8 C	-0.53 C
1977	10.1 C	-0.30 C
1978	10.0 C	-0.35 C
1979	10.3 C	-0.01 C
1980	10.3 C	-0.03 C
1981	10.9 C	+0.54 C
1982	9.2 C	-1.14 C
1983	9.9 C	-0.47 C
1984	9.8 C	-0.54 C
1985	10.0 C	-0.31 C
1986	11.2 C	+0.85 C
1987	10.8 C	+0.48 C
1988	10.8 C	+0.49 C
1989	9.8 C	-0.56 C
1990	9.9 C	-0.49 C
1991	10.2 C	-0.14 C
1992	11.2 C	+0.85 C
1993	9.4 C	-0.97 C
1994	10.2 C	-0.11 C
1995	10.8 C	+0.43 C
1996	10.8 C	+0.44 C
1997	10.5 C	+0.11 C
1998	10.2 C	-0.16 C
1999	9.8 C	-0.56 C
2000	10.2 C	-0.12 C
2001	10.6 C	+0.29 C
2002	10.4 C	+0.08 C
2003	10.8 C	+0.49 C
2004	10.5 C	+0.17 C
2005	10.1 C	-0.21 C
2006	10.3 C	-0.08 C
2007	10.5 C	+0.13 C
2008	10.1 C	-0.25 C
2009	10.3 C	-0.06 C
2010	10.2 C	-0.15 C
2011	9.5 C	-0.86 C
2013	9.7 C	-0.70 C
2014	10.9 C	+0.56 C
2015	11.4 C	+1.04 C
2016	11.6 C	+1.24 C
2017	11.3 C	+0.97 C

The fitted trend in annual mean temperature here over 1954 to 2017 is 0.04 C (-0.04 to 0.11) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.2) per decade. The slope is a straight line fitted to 60 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Callahan
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.04 C (-0.04 to 0.11) per decade	0.1 F (-0.1 to 0.2) per decade	1954 to 2017	60	Not clearly different from zero
Mean daily maximum	-0.1 C (-0.2 to 0.1) per decade	-0.1 F (-0.3 to 0.1) per decade	1954 to 2017	60	Not clearly different from zero
Mean daily minimum	0.12 C (0.02 to 0.22) per decade	0.22 F (0.03 to 0.40) per decade	1954 to 2017	60	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

1943 to 2018

Yearly extremes at Callahan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.1 C (106.0 F)	1959	37.2 C (99.0 F)	66
Coldest night (TNn)	-22.8 C (-9.0 F)	1972	-12.8 C (9.0 F)	66
Wettest day (Rx1day)	125.2 mm (4.9 in)	1964	46.3 mm (1.8 in)	76
Wettest five days (Rx5day)	270.3 mm (10.6 in)	1964	82.3 mm (3.2 in)	76
Longest dry spell (CDD)	115 days	1981	51 days	76

Hottest day (TXx)

The hottest day of the year at Callahan, 1943 to 2018. The record is 41.1 C (106.0 F) in 1959, marked on the chart; the median year is 37.2 C (99.0 F).

Hottest day (TXx) at Callahan by year
Year	Hottest day (TXx)
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	38.3 C (100.9 F)
1954	39.4 C (102.9 F)
1955	40.6 C (105.1 F)
1956	40.0 C (104.0 F)
1957	38.9 C (102.0 F)
1958	38.3 C (100.9 F)
1959	41.1 C (106.0 F)
1960	40.6 C (105.1 F)
1961	40.6 C (105.1 F)
1962	38.3 C (100.9 F)
1963	37.2 C (99.0 F)
1964	40.0 C (104.0 F)
1965	37.8 C (100.0 F)
1966	40.0 C (104.0 F)
1967	39.4 C (102.9 F)
1968	40.6 C (105.1 F)
1969	38.3 C (100.9 F)
1970	40.6 C (105.1 F)
1971	36.7 C (98.1 F)
1972	38.9 C (102.0 F)
1973	36.1 C (97.0 F)
1974	35.6 C (96.1 F)
1975	36.1 C (97.0 F)
1976	33.9 C (93.0 F)
1977	36.7 C (98.1 F)
1978	35.6 C (96.1 F)
1979	35.6 C (96.1 F)
1980	36.7 C (98.1 F)
1981	38.9 C (102.0 F)
1982	34.4 C (93.9 F)
1983	34.4 C (93.9 F)
1984	35.6 C (96.1 F)
1985	36.1 C (97.0 F)
1986	35.6 C (96.1 F)
1987	37.2 C (99.0 F)
1988	37.8 C (100.0 F)
1989	32.8 C (91.0 F)
1990	36.1 C (97.0 F)
1991	36.7 C (98.1 F)
1992	36.7 C (98.1 F)
1993	35.6 C (96.1 F)
1994	37.8 C (100.0 F)
1995	33.9 C (93.0 F)
1996	36.1 C (97.0 F)
1997	34.4 C (93.9 F)
1998	36.7 C (98.1 F)
1999	36.7 C (98.1 F)
2000	35.6 C (96.1 F)
2001	37.2 C (99.0 F)
2002	39.4 C (102.9 F)
2003	38.3 C (100.9 F)
2004	36.1 C (97.0 F)
2005	37.2 C (99.0 F)
2006	37.8 C (100.0 F)
2007	37.2 C (99.0 F)
2008	37.8 C (100.0 F)
2009	37.8 C (100.0 F)
2010	36.7 C (98.1 F)
2011	35.6 C (96.1 F)
2012	37.2 C (99.0 F)
2013	38.3 C (100.9 F)
2014	37.8 C (100.0 F)
2015	38.3 C (100.9 F)
2016	38.9 C (102.0 F)
2017	40.0 C (104.0 F)
2018	36.7 C (98.1 F)

Coldest night (TNn)

The coldest night of the year at Callahan, 1943 to 2018. The record is -22.8 C (-9.0 F) in 1972, marked on the chart; the median year is -12.8 C (9.0 F).

Coldest night (TNn) at Callahan by year
Year	Coldest night (TNn)
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	-8.3 C (17.1 F)
1954	-12.8 C (9.0 F)
1955	-14.4 C (6.1 F)
1956	-15.6 C (3.9 F)
1957	-21.1 C (-6.0 F)
1958	-11.7 C (10.9 F)
1959	-12.2 C (10.0 F)
1960	-15.6 C (3.9 F)
1961	-12.8 C (9.0 F)
1962	-21.1 C (-6.0 F)
1963	-15.6 C (3.9 F)
1964	-14.4 C (6.1 F)
1965	-12.8 C (9.0 F)
1966	-16.7 C (1.9 F)
1967	-17.2 C (1.0 F)
1968	-15.6 C (3.9 F)
1969	-13.9 C (7.0 F)
1970	-12.2 C (10.0 F)
1971	-12.2 C (10.0 F)
1972	-22.8 C (-9.0 F)
1973	-12.2 C (10.0 F)
1974	-18.3 C (-0.9 F)
1975	-13.9 C (7.0 F)
1976	-12.8 C (9.0 F)
1977	-16.7 C (1.9 F)
1978	-13.3 C (8.1 F)
1979	-13.3 C (8.1 F)
1980	-12.2 C (10.0 F)
1981	-7.8 C (18.0 F)
1982	-14.4 C (6.1 F)
1983	-11.7 C (10.9 F)
1984	-11.7 C (10.9 F)
1985	-11.7 C (10.9 F)
1986	-8.3 C (17.1 F)
1987	-13.9 C (7.0 F)
1988	-12.8 C (9.0 F)
1989	-18.3 C (-0.9 F)
1990	-21.1 C (-6.0 F)
1991	-11.7 C (10.9 F)
1992	-9.4 C (15.1 F)
1993	-13.9 C (7.0 F)
1994	-10.6 C (12.9 F)
1995	-8.3 C (17.1 F)
1996	-7.8 C (18.0 F)
1997	-12.8 C (9.0 F)
1998	-18.3 C (-0.9 F)
1999	-11.1 C (12.0 F)
2000	-8.9 C (16.0 F)
2001	-12.8 C (9.0 F)
2002	-12.2 C (10.0 F)
2003	-8.3 C (17.1 F)
2004	-14.4 C (6.1 F)
2005	-13.3 C (8.1 F)
2006	-11.1 C (12.0 F)
2007	-13.3 C (8.1 F)
2008	-11.7 C (10.9 F)
2009	-16.7 C (1.9 F)
2010	-11.7 C (10.9 F)
2011	-14.4 C (6.1 F)
2012	-13.9 C (7.0 F)
2013	-20.6 C (-5.1 F)
2014	-12.8 C (9.0 F)
2015	-11.7 C (10.9 F)
2016	-13.9 C (7.0 F)
2017	-18.9 C (-2.0 F)
2018	-11.7 C (10.9 F)

Wettest day (Rx1day)

The wettest day of the year at Callahan, 1943 to 2018. The record is 125.2 mm (4.9 in) in 1964, marked on the chart; the median year is 46.3 mm (1.8 in).

Wettest day (Rx1day) at Callahan by year
Year	Wettest day (Rx1day)
1943	33.5 mm (1.3 in)
1944	23.6 mm (0.9 in)
1945	74.2 mm (2.9 in)
1946	53.8 mm (2.1 in)
1947	112.3 mm (4.4 in)
1948	35.1 mm (1.4 in)
1949	29.5 mm (1.2 in)
1950	59.4 mm (2.3 in)
1951	40.1 mm (1.6 in)
1952	43.7 mm (1.7 in)
1953	49.8 mm (2.0 in)
1954	76.7 mm (3.0 in)
1955	73.7 mm (2.9 in)
1956	55.1 mm (2.2 in)
1957	46.0 mm (1.8 in)
1958	44.7 mm (1.8 in)
1959	38.9 mm (1.5 in)
1960	58.4 mm (2.3 in)
1961	31.2 mm (1.2 in)
1962	55.6 mm (2.2 in)
1963	35.1 mm (1.4 in)
1964	125.2 mm (4.9 in)
1965	42.4 mm (1.7 in)
1966	31.0 mm (1.2 in)
1967	52.3 mm (2.1 in)
1968	58.7 mm (2.3 in)
1969	49.3 mm (1.9 in)
1970	30.7 mm (1.2 in)
1971	29.5 mm (1.2 in)
1972	48.8 mm (1.9 in)
1973	41.7 mm (1.6 in)
1974	64.3 mm (2.5 in)
1975	45.7 mm (1.8 in)
1976	31.0 mm (1.2 in)
1977	42.9 mm (1.7 in)
1978	41.1 mm (1.6 in)
1979	35.3 mm (1.4 in)
1980	58.7 mm (2.3 in)
1981	53.6 mm (2.1 in)
1982	36.6 mm (1.4 in)
1983	83.6 mm (3.3 in)
1984	42.2 mm (1.7 in)
1985	32.8 mm (1.3 in)
1986	47.8 mm (1.9 in)
1987	55.9 mm (2.2 in)
1988	45.7 mm (1.8 in)
1989	50.5 mm (2.0 in)
1990	42.4 mm (1.7 in)
1991	45.2 mm (1.8 in)
1992	31.0 mm (1.2 in)
1993	50.3 mm (2.0 in)
1994	37.3 mm (1.5 in)
1995	110.7 mm (4.4 in)
1996	50.3 mm (2.0 in)
1997	60.7 mm (2.4 in)
1998	56.4 mm (2.2 in)
1999	25.7 mm (1.0 in)
2000	48.3 mm (1.9 in)
2001	29.2 mm (1.1 in)
2002	76.7 mm (3.0 in)
2003	63.8 mm (2.5 in)
2004	61.5 mm (2.4 in)
2005	66.8 mm (2.6 in)
2006	43.9 mm (1.7 in)
2007	40.9 mm (1.6 in)
2008	68.8 mm (2.7 in)
2009	46.5 mm (1.8 in)
2010	77.5 mm (3.1 in)
2011	26.7 mm (1.1 in)
2012	52.6 mm (2.1 in)
2013	38.6 mm (1.5 in)
2014	55.4 mm (2.2 in)
2015	115.6 mm (4.6 in)
2016	35.6 mm (1.4 in)
2017	39.1 mm (1.5 in)
2018	24.9 mm (1.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Callahan, 1943 to 2018. The record is 270.3 mm (10.6 in) in 1964, marked on the chart; the median year is 82.3 mm (3.2 in).

Wettest five days (Rx5day) at Callahan by year
Year	Wettest five days (Rx5day)
1943	52.8 mm (2.1 in)
1944	52.5 mm (2.1 in)
1945	90.3 mm (3.6 in)
1946	115.2 mm (4.5 in)
1947	124.2 mm (4.9 in)
1948	78.8 mm (3.1 in)
1949	39.9 mm (1.6 in)
1950	178.8 mm (7.0 in)
1951	89.2 mm (3.5 in)
1952	92.7 mm (3.6 in)
1953	106.7 mm (4.2 in)
1954	94.2 mm (3.7 in)
1955	202.0 mm (8.0 in)
1956	68.6 mm (2.7 in)
1957	113.4 mm (4.5 in)
1958	76.6 mm (3.0 in)
1959	90.3 mm (3.6 in)
1960	122.7 mm (4.8 in)
1961	59.5 mm (2.3 in)
1962	169.0 mm (6.7 in)
1963	78.4 mm (3.1 in)
1964	270.3 mm (10.6 in)
1965	65.3 mm (2.6 in)
1966	75.5 mm (3.0 in)
1967	61.2 mm (2.4 in)
1968	83.3 mm (3.3 in)
1969	110.8 mm (4.4 in)
1970	104.4 mm (4.1 in)
1971	50.3 mm (2.0 in)
1972	106.1 mm (4.2 in)
1973	79.2 mm (3.1 in)
1974	147.0 mm (5.8 in)
1975	76.3 mm (3.0 in)
1976	58.0 mm (2.3 in)
1977	107.4 mm (4.2 in)
1978	110.4 mm (4.3 in)
1979	71.3 mm (2.8 in)
1980	93.7 mm (3.7 in)
1981	132.5 mm (5.2 in)
1982	81.2 mm (3.2 in)
1983	127.9 mm (5.0 in)
1984	57.0 mm (2.2 in)
1985	49.6 mm (2.0 in)
1986	142.8 mm (5.6 in)
1987	112.8 mm (4.4 in)
1988	72.6 mm (2.9 in)
1989	65.3 mm (2.6 in)
1990	81.0 mm (3.2 in)
1991	72.7 mm (2.9 in)
1992	73.3 mm (2.9 in)
1993	72.4 mm (2.9 in)
1994	42.4 mm (1.7 in)
1995	180.3 mm (7.1 in)
1996	97.6 mm (3.8 in)
1997	169.0 mm (6.7 in)
1998	114.9 mm (4.5 in)
1999	62.0 mm (2.4 in)
2000	74.0 mm (2.9 in)
2001	70.7 mm (2.8 in)
2002	175.5 mm (6.9 in)
2003	72.7 mm (2.9 in)
2004	77.9 mm (3.1 in)
2005	165.6 mm (6.5 in)
2006	147.9 mm (5.8 in)
2007	56.5 mm (2.2 in)
2008	94.2 mm (3.7 in)
2009	52.1 mm (2.1 in)
2010	102.6 mm (4.0 in)
2011	53.9 mm (2.1 in)
2012	139.7 mm (5.5 in)
2013	50.5 mm (2.0 in)
2014	69.9 mm (2.8 in)
2015	187.0 mm (7.4 in)
2016	86.7 mm (3.4 in)
2017	69.6 mm (2.7 in)
2018	49.8 mm (2.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Callahan, 1943 to 2018. The record is 115 days in 1981, marked on the chart; the median year is 51 days.

Longest dry spell (CDD) at Callahan by year
Year	Longest dry spell (CDD)
1943	19 days
1944	58 days
1945	70 days
1946	50 days
1947	40 days
1948	35 days
1949	41 days
1950	66 days
1951	52 days
1952	33 days
1953	62 days
1954	58 days
1955	37 days
1956	37 days
1957	49 days
1958	23 days
1959	60 days
1960	89 days
1961	40 days
1962	49 days
1963	82 days
1964	55 days
1965	41 days
1966	69 days
1967	39 days
1968	30 days
1969	55 days
1970	59 days
1971	39 days
1972	66 days
1973	68 days
1974	82 days
1975	51 days
1976	42 days
1977	65 days
1978	69 days
1979	64 days
1980	43 days
1981	115 days
1982	58 days
1983	25 days
1984	42 days
1985	44 days
1986	48 days
1987	52 days
1988	44 days
1989	39 days
1990	29 days
1991	27 days
1992	29 days
1993	39 days
1994	80 days
1995	53 days
1996	44 days
1997	32 days
1998	31 days
1999	81 days
2000	60 days
2001	61 days
2002	60 days
2003	73 days
2004	46 days
2005	86 days
2006	59 days
2007	46 days
2008	103 days
2009	54 days
2010	54 days
2011	49 days
2012	112 days
2013	36 days
2014	33 days
2015	32 days
2016	75 days
2017	43 days
2018	69 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

60 years with a frost

Across 60 years with a frost, the median last spring frost at Callahan falls on 29 May and the median first autumn frost on 22 September, which leaves a median of 118 days between them.

In 1987 to 2017 the median growing season was 117 days. That is 2 days fewer than in 1954 to 1986.

Fitted over all years, the growing season changes by -0.9 days per decade at this station.

Frost dates and growing season at Callahan
Measure	Median, all years	Earliest period (1954 to 1986)	Recent period (1987 to 2017)	Recent against earliest	Fitted trend
Last spring frost	29 May	27 May	4 June	8 days later	+0.2 days per decade
First autumn frost	22 September	21 September	23 September	2 days later	-0.7 days per decade
Growing days	118 days	119 days	117 days	2 days fewer	-0.9 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

72 years, 1944 to 2017

A day with at least 46.6 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 128.0 mm (5.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Callahan: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	46.6 mm (1.8 in)
5 years	63.5 mm (2.5 in)
10 years	76.4 mm (3.0 in)
25 years	95.0 mm (3.7 in)
50 years	110.6 mm (4.4 in)
100 years	128.0 mm (5.0 in)	Longer than the 72 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, 72 years of values from 1944 to 2017.

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: 125.2 mm (4.9 in) in 1964; 115.6 mm (4.6 in) in 2015; 112.3 mm (4.4 in) in 1947.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Callahan, at 2011. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 2011 ran 0.5 C (0.8 F) lower than in the years before (likely change).

Suspected changes in the annual mean temperature at Callahan, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
2011	-0.5	-0.8	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.

Climate Twins

2002 to 2017 against 1961 to 1990

Over 2002 to 2017, Callahan had a mean temperature of 10.5 C (50.9 F) and 506.9 mm (20.0 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Hat Creek (United States, 116 km away), Mimbres 4NNW (United States, 1,610 km away) and Heppner (United States, 520 km away).

Climate twins of Callahan: stations whose 1961 to 1990 climate is closest to its 2002 to 2017 climate
Twin station	Country	Distance away	Mean temperature, 1961-1990	Rain a year, 1961-1990	Climate difference
Hat Creek	United States	116 km (72 mi)	10.3 C (50.6 F)	497.7 mm (19.6 in)	0.53
Mimbres 4NNW	United States	1,610 km (1,000 mi)	10.8 C (51.5 F)	474.5 mm (18.7 in)	0.78
Heppner	United States	520 km (323 mi)	10.4 C (50.6 F)	348.5 mm (13.7 in)	0.80

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

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