Naco Weather Records (MXN00026057)

Record envelope, standing records and threshold days for Naco (MXN00026057), Mexico, with 82 years of record.

Key Facts for Naco

Naco (MXN00026057) is a weather station in Mexico at 31.32 latitude and -109.93 longitude, 1,411 m (4,629 ft) above sea level.
The station reports from 1931 to 2012, 82 years of record.
1,464 records set at Naco still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Naco set a daily record high minimum temperature of 11.7 C (53.1 F) on 9 November 2012.

About the Station

Location: Mexico, 31.32 latitude, -109.93 longitude.
Elevation: 1,411 m (4,629 ft).
Period of record: 1931 to 2012, 82 years.
Eligible elements: tmax, tmin, 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 Naco. 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 Naco, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	34.4 C (93.9 F)	-11.1 C (12.0 F)	n/a	n/a
Feb	32.8 C (91.0 F)	-15.0 C (5.0 F)	n/a	n/a
Mar	33.9 C (93.0 F)	-8.3 C (17.1 F)	n/a	n/a
Apr	37.8 C (100.0 F)	-4.4 C (24.1 F)	n/a	n/a
May	40.6 C (105.1 F)	-1.1 C (30.0 F)	n/a	n/a
Jun	45.0 C (113.0 F)	6.7 C (44.1 F)	n/a	n/a
Jul	41.7 C (107.1 F)	6.7 C (44.1 F)	n/a	n/a
Aug	41.7 C (107.1 F)	10.0 C (50.0 F)	n/a	n/a
Sep	43.9 C (111.0 F)	3.9 C (39.0 F)	n/a	n/a
Oct	35.6 C (96.1 F)	-4.4 C (24.1 F)	n/a	n/a
Nov	37.8 C (100.0 F)	-7.2 C (19.0 F)	n/a	n/a
Dec	35.6 C (96.1 F)	-12.2 C (10.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Naco still stand. 1995 holds the most, with 68.

Standing records at Naco by the year they were set
Year set	Standing records
1931	8
1932	65
1933	35
1934	65
1935	21
1936	32
1937	26
1938	12
1939	13
1940	12
1941	24
1942	17
1943	44
1944	19
1945	6
1946	10
1947	6
1949	18
1950	37
1951	15
1952	15
1953	8
1954	7
1955	25
1956	13
1957	24
1958	60
1959	35
1960	24
1962	17
1963	17
1965	43
1966	21
1967	57
1968	3
1969	11
1970	8
1971	26
1972	22
1973	15
1974	17
1975	16
1976	14
1977	10
1978	18
1979	28
1980	16
1981	4
1982	18
1983	15
1984	15
1985	21
1986	15
1987	9
1988	7
1989	19
1990	45
1991	4
1992	6
1994	10
1995	68
1996	1
1997	14
1998	6
1999	9
2000	14
2001	7
2002	7
2003	12
2004	12
2005	12
2006	10
2007	8
2008	9
2009	11
2010	5
2011	11
2012	5

All-Time Record Progression

8 new records

8 all-time records were set at Naco between 4 January 1971 and 3 February 2011. Each dot is a new record.

When Naco set new all-time records
Date	Kind	Detail
1971-01-04	Record low minimum temperature	Record low minimum temperature -11.1 C (12.0 F)
1978-12-08	Record low maximum temperature	Record low maximum temperature -2.2 C (28.0 F)
1978-12-09	Record low minimum temperature	Record low minimum temperature -12.2 C (10.0 F)
1980-06-24	Record high maximum temperature	Record high maximum temperature 41.7 C (107.1 F)
1990-06-17	Record high maximum temperature	Record high maximum temperature 42.8 C (109.0 F)
1990-06-18	Record high maximum temperature	Record high maximum temperature 43.9 C (111.0 F)
1990-06-19	Record high maximum temperature	Record high maximum temperature 45.0 C (113.0 F)
2011-02-03	Record low minimum temperature	Record low minimum temperature -15.0 C (5.0 F)

Wettest Day of Each Month

Aug: 99.8 mm (3.9 in)

The wettest day on record for each calendar month at Naco. The most was 99.8 mm (3.9 in) on 9 August 1932.

Record daily precipitation for each month at Naco
Month	Record daily precipitation (mm)	Date
Jan	54.9 mm (2.2 in)	5 January 1946
Feb	41.9 mm (1.6 in)	28 February 1953
Mar	59.9 mm (2.4 in)	31 March 1945
Apr	35.8 mm (1.4 in)	24 April 1952
May	25.9 mm (1.0 in)	28 May 2005
Jun	55.9 mm (2.2 in)	2 June 1952
Jul	71.9 mm (2.8 in)	24 July 1957
Aug	99.8 mm (3.9 in)	9 August 1932
Sep	66.3 mm (2.6 in)	10 September 1964
Oct	63.8 mm (2.5 in)	7 October 1977
Nov	38.9 mm (1.5 in)	22 November 1931
Dec	54.9 mm (2.2 in)	17 December 1987

Period of Record Coverage

1931 to 2012

80 years of record at Naco, 1931 to 2012. 20 years have data for under 90 percent of days and are left out of rankings: 1932, 1946, 1947, 1953, 1954, 1955, 1956, 1960 and others.

Days with data per year at Naco
Year	Days with data	Share of year	Complete
1931	365	100%	Yes
1932	311	85%	No
1933	362	99%	Yes
1934	365	100%	Yes
1935	334	92%	Yes
1936	339	93%	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
1945	365	100%	Yes
1946	273	75%	No
1947	212	58%	No
1949	362	99%	Yes
1950	334	92%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	119	33%	No
1954	245	67%	No
1955	273	75%	No
1956	275	75%	No
1957	365	100%	Yes
1958	342	94%	Yes
1959	335	92%	Yes
1960	121	33%	No
1962	275	75%	No
1963	181	50%	No
1964	92	25%	No
1965	365	100%	Yes
1966	359	98%	Yes
1967	233	64%	No
1968	160	44%	No
1969	361	99%	Yes
1970	364	100%	Yes
1971	285	78%	No
1972	366	100%	Yes
1973	356	98%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	364	100%	Yes
1978	364	100%	Yes
1979	344	94%	Yes
1980	364	99%	Yes
1981	365	100%	Yes
1982	362	99%	Yes
1983	364	100%	Yes
1984	365	100%	Yes
1985	363	99%	Yes
1986	364	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	211	58%	No
1991	245	67%	No
1992	213	58%	No
1993	17	5%	No
1994	236	65%	No
1995	334	92%	Yes
1996	13	4%	No
1997	364	100%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	360	99%	Yes
2003	334	92%	Yes
2004	359	98%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	364	100%	Yes
2010	332	91%	Yes
2011	359	98%	Yes
2012	334	91%	Yes

Latest Records

Latest records at Naco
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
9 November 2012	Naco, MX	daily high min	11.7 C (53.1 F)	1.1 C (2.0 F)	30 years	20 of 100 (Routine)
13 September 2012	Naco, MX	daily rain	28.4 mm (1.1 in)	3.5 mm (0.14 in)	63 years	29 of 100 (Routine)
14 August 2012	Naco, MX	daily high max (Tie)	37.8 C (100.0 F)	tie	17 years	3 of 100 (Routine)
13 August 2012	Naco, MX	daily high max (Tie)	37.8 C (100.0 F)	tie	75 years	7 of 100 (Routine)
9 May 2012	Naco, MX	daily rain	6.9 mm (0.27 in)	6.9 mm (0.27 in)	81 years	20 of 100 (Routine)
24 April 2012	Naco, MX	daily high max	33.9 C (93.0 F)	2.2 C (4.0 F)	69 years	32 of 100 (Routine)
23 April 2012	Naco, MX	daily high max	35.0 C (95.0 F)	2.2 C (4.0 F)	45 years	25 of 100 (Routine)
23 April 2012	Naco, MX	daily high min (Tie)	16.7 C (62.1 F)	tie	69 years	7 of 100 (Routine)
22 April 2012	Naco, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	47 years	5 of 100 (Routine)
29 March 2012	Naco, MX	daily high max (Tie)	28.9 C (84.0 F)	tie	52 years	5 of 100 (Routine)
28 March 2012	Naco, MX	daily high max (Tie)	28.9 C (84.0 F)	tie	69 years	7 of 100 (Routine)
24 March 2012	Naco, MX	daily high max (Tie)	28.9 C (84.0 F)	tie	69 years	7 of 100 (Routine)
20 March 2012	Naco, MX	daily low min	-4.4 C (24.1 F)	3.3 C (5.9 F)	32 years	27 of 100 (Routine)
1 March 2012	Naco, MX	daily low min (Tie)	-2.2 C (28.0 F)	tie	61 years	6 of 100 (Routine)
16 January 2012	Naco, MX	daily high min	6.7 C (44.1 F)	1.1 C (2.0 F)	32 years	20 of 100 (Routine)
3 January 2012	Naco, MX	daily high max (Tie)	22.8 C (73.0 F)	tie	56 years	6 of 100 (Routine)
23 December 2011	Naco, MX	daily low max	3.9 C (39.0 F)	1.1 C (2.0 F)	1 year	10 of 100 (Routine)
12 December 2011	Naco, MX	daily rain	20.8 mm (0.8 in)	10.9 mm (0.4 in)	9 years	20 of 100 (Routine)
6 December 2011	Naco, MX	daily low min	-5.0 C (23.0 F)	1.7 C (3.1 F)	12 years	16 of 100 (Routine)
6 December 2011	Naco, MX	daily low max (Tie)	7.8 C (46.0 F)	tie	32 years	4 of 100 (Routine)

Climate Trend

51 complete years, 1931 to 2011

One stripe for each of 51 complete years at Naco, 1931 to 2011. Blue stripes are years cooler than the station's own mean of 17.1 C (62.8 F); red stripes are warmer. The coolest year was 1933, at 15.4 C (59.7 F), and the warmest was 1989, at 18.8 C (65.8 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Naco as warming stripes, 1931 to 2011
Year	Annual mean temperature	Difference from the station mean
1931	16.1 C	-1.01 C
1933	15.4 C	-1.72 C
1934	16.3 C	-0.82 C
1937	18.0 C	+0.88 C
1938	18.1 C	+1.03 C
1939	17.3 C	+0.23 C
1940	17.9 C	+0.78 C
1941	16.5 C	-0.55 C
1942	17.7 C	+0.61 C
1943	18.4 C	+1.30 C
1944	17.4 C	+0.30 C
1945	17.8 C	+0.67 C
1949	17.2 C	+0.15 C
1951	16.2 C	-0.92 C
1952	16.9 C	-0.18 C
1957	17.3 C	+0.23 C
1958	18.1 C	+1.00 C
1965	16.5 C	-0.56 C
1966	17.1 C	+0.04 C
1969	16.8 C	-0.30 C
1970	15.8 C	-1.28 C
1972	16.7 C	-0.42 C
1973	17.5 C	+0.41 C
1974	16.5 C	-0.64 C
1975	15.9 C	-1.24 C
1976	15.9 C	-1.23 C
1977	16.7 C	-0.43 C
1978	16.6 C	-0.54 C
1980	17.0 C	-0.13 C
1981	17.3 C	+0.25 C
1982	16.6 C	-0.54 C
1983	16.0 C	-1.10 C
1984	16.4 C	-0.71 C
1985	16.2 C	-0.85 C
1986	17.2 C	+0.12 C
1987	16.7 C	-0.39 C
1988	17.3 C	+0.24 C
1989	18.8 C	+1.67 C
1997	17.6 C	+0.49 C
1998	17.3 C	+0.23 C
1999	17.8 C	+0.70 C
2000	17.8 C	+0.72 C
2001	17.2 C	+0.11 C
2002	17.9 C	+0.76 C
2004	16.9 C	-0.19 C
2005	17.8 C	+0.68 C
2006	17.6 C	+0.55 C
2007	17.6 C	+0.50 C
2008	17.2 C	+0.08 C
2009	17.8 C	+0.74 C
2011	17.5 C	+0.42 C

The fitted trend in annual mean temperature here over 1931 to 2011 is 0.05 C (-0.04 to 0.13) 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 51 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Naco
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.05 C (-0.04 to 0.13) per decade	0.1 F (-0.1 to 0.2) per decade	1931 to 2011	51	Not clearly different from zero
Mean daily maximum	0.02 C (-0.13 to 0.17) per decade	0.04 F (-0.23 to 0.31) per decade	1931 to 2011	51	Not clearly different from zero
Mean daily minimum	0.1 C (0.0 to 0.2) per decade	0.1 F (0.0 to 0.3) per decade	1931 to 2011	51	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

1931 to 2012

Yearly extremes at Naco: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	45.0 C (113.0 F)	1990	39.2 C (102.5 F)	80
Coldest night (TNn)	-15.0 C (5.0 F)	2011	-6.1 C (21.0 F)	80
Wettest day (Rx1day)	99.8 mm (3.9 in)	1932	39.9 mm (1.6 in)	80
Wettest five days (Rx5day)	145.4 mm (5.7 in)	1977	61.1 mm (2.4 in)	80
Longest dry spell (CDD)	153 days	2000	82 days	80

Hottest day (TXx)

The hottest day of the year at Naco, 1931 to 2012. The record is 45.0 C (113.0 F) in 1990, marked on the chart; the median year is 39.2 C (102.5 F).

Hottest day (TXx) at Naco by year
Year	Hottest day (TXx)
1931	35.6 C (96.1 F)
1932	36.7 C (98.1 F)
1933	38.9 C (102.0 F)
1934	37.8 C (100.0 F)
1935	37.8 C (100.0 F)
1936	37.8 C (100.0 F)
1937	40.0 C (104.0 F)
1938	40.0 C (104.0 F)
1939	40.0 C (104.0 F)
1940	40.6 C (105.1 F)
1941	37.8 C (100.0 F)
1942	40.6 C (105.1 F)
1943	40.0 C (104.0 F)
1944	40.6 C (105.1 F)
1945	40.0 C (104.0 F)
1946	37.8 C (100.0 F)
1947	28.9 C (84.0 F)
1949	40.6 C (105.1 F)
1950	40.6 C (105.1 F)
1951	37.8 C (100.0 F)
1952	36.7 C (98.1 F)
1953	28.9 C (84.0 F)
1954	37.8 C (100.0 F)
1955	38.9 C (102.0 F)
1956	37.8 C (100.0 F)
1957	37.8 C (100.0 F)
1958	38.9 C (102.0 F)
1959	36.7 C (98.1 F)
1960	35.0 C (95.0 F)
1962	40.0 C (104.0 F)
1963	40.0 C (104.0 F)
1964	36.1 C (97.0 F)
1965	40.0 C (104.0 F)
1966	40.0 C (104.0 F)
1967	40.6 C (105.1 F)
1968	36.1 C (97.0 F)
1969	40.6 C (105.1 F)
1970	37.8 C (100.0 F)
1971	37.2 C (99.0 F)
1972	38.9 C (102.0 F)
1973	40.0 C (104.0 F)
1974	40.0 C (104.0 F)
1975	38.9 C (102.0 F)
1976	37.8 C (100.0 F)
1977	37.8 C (100.0 F)
1978	38.9 C (102.0 F)
1979	40.0 C (104.0 F)
1980	41.7 C (107.1 F)
1981	38.9 C (102.0 F)
1982	38.9 C (102.0 F)
1983	37.8 C (100.0 F)
1984	38.9 C (102.0 F)
1985	38.9 C (102.0 F)
1986	40.0 C (104.0 F)
1987	37.8 C (100.0 F)
1988	37.8 C (100.0 F)
1989	41.7 C (107.1 F)
1990	45.0 C (113.0 F)
1991	40.6 C (105.1 F)
1992	40.6 C (105.1 F)
1993	23.9 C (75.0 F)
1994	41.7 C (107.1 F)
1995	43.9 C (111.0 F)
1996	20.0 C (68.0 F)
1997	41.7 C (107.1 F)
1998	40.6 C (105.1 F)
1999	40.0 C (104.0 F)
2000	40.0 C (104.0 F)
2001	38.9 C (102.0 F)
2002	41.1 C (106.0 F)
2003	41.7 C (107.1 F)
2004	40.0 C (104.0 F)
2005	40.6 C (105.1 F)
2006	40.6 C (105.1 F)
2007	40.0 C (104.0 F)
2008	38.9 C (102.0 F)
2009	38.9 C (102.0 F)
2010	39.4 C (102.9 F)
2011	41.7 C (107.1 F)
2012	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at Naco, 1931 to 2012. The record is -15.0 C (5.0 F) in 2011, marked on the chart; the median year is -6.1 C (21.0 F).

Coldest night (TNn) at Naco by year
Year	Coldest night (TNn)
1931	0.0 C (32.0 F)
1932	0.0 C (32.0 F)
1933	0.0 C (32.0 F)
1934	-3.3 C (26.1 F)
1935	-5.0 C (23.0 F)
1936	-7.2 C (19.0 F)
1937	-7.2 C (19.0 F)
1938	-3.3 C (26.1 F)
1939	-8.3 C (17.1 F)
1940	-4.4 C (24.1 F)
1941	-4.4 C (24.1 F)
1942	-4.4 C (24.1 F)
1943	-4.4 C (24.1 F)
1944	-7.2 C (19.0 F)
1945	-5.0 C (23.0 F)
1946	-6.1 C (21.0 F)
1947	-8.3 C (17.1 F)
1949	-6.1 C (21.0 F)
1950	-5.0 C (23.0 F)
1951	-5.0 C (23.0 F)
1952	-4.4 C (24.1 F)
1953	-7.2 C (19.0 F)
1954	-7.2 C (19.0 F)
1955	-9.4 C (15.1 F)
1956	-10.0 C (14.0 F)
1957	-6.1 C (21.0 F)
1958	-7.2 C (19.0 F)
1959	-7.2 C (19.0 F)
1960	-8.3 C (17.1 F)
1962	0.0 C (32.0 F)
1963	-8.3 C (17.1 F)
1964	6.7 C (44.1 F)
1965	-6.1 C (21.0 F)
1966	-6.1 C (21.0 F)
1967	-6.1 C (21.0 F)
1968	0.0 C (32.0 F)
1969	-6.1 C (21.0 F)
1970	-7.2 C (19.0 F)
1971	-11.1 C (12.0 F)
1972	-6.1 C (21.0 F)
1973	-3.3 C (26.1 F)
1974	-9.4 C (15.1 F)
1975	-7.2 C (19.0 F)
1976	-8.3 C (17.1 F)
1977	-5.0 C (23.0 F)
1978	-12.2 C (10.0 F)
1979	-8.3 C (17.1 F)
1980	-5.0 C (23.0 F)
1981	-5.0 C (23.0 F)
1982	-6.1 C (21.0 F)
1983	-7.2 C (19.0 F)
1984	-5.0 C (23.0 F)
1985	-8.3 C (17.1 F)
1986	-3.3 C (26.1 F)
1987	-7.2 C (19.0 F)
1988	-6.1 C (21.0 F)
1989	-5.0 C (23.0 F)
1990	-6.1 C (21.0 F)
1991	-4.4 C (24.1 F)
1992	-2.2 C (28.0 F)
1993	0.0 C (32.0 F)
1994	0.0 C (32.0 F)
1995	-5.0 C (23.0 F)
1996	-5.0 C (23.0 F)
1997	-7.2 C (19.0 F)
1998	-6.1 C (21.0 F)
1999	-5.0 C (23.0 F)
2000	-4.4 C (24.1 F)
2001	-6.1 C (21.0 F)
2002	-9.4 C (15.1 F)
2003	-8.3 C (17.1 F)
2004	-6.1 C (21.0 F)
2005	-5.0 C (23.0 F)
2006	-7.2 C (19.0 F)
2007	-8.3 C (17.1 F)
2008	-6.1 C (21.0 F)
2009	-4.4 C (24.1 F)
2010	-7.2 C (19.0 F)
2011	-15.0 C (5.0 F)
2012	-4.4 C (24.1 F)

Wettest day (Rx1day)

The wettest day of the year at Naco, 1931 to 2012. The record is 99.8 mm (3.9 in) in 1932, marked on the chart; the median year is 39.9 mm (1.6 in).

Wettest day (Rx1day) at Naco by year
Year	Wettest day (Rx1day)
1931	38.9 mm (1.5 in)
1932	99.8 mm (3.9 in)
1933	54.9 mm (2.2 in)
1934	57.9 mm (2.3 in)
1935	39.9 mm (1.6 in)
1936	63.0 mm (2.5 in)
1937	34.8 mm (1.4 in)
1938	29.0 mm (1.1 in)
1939	33.8 mm (1.3 in)
1940	23.9 mm (0.9 in)
1941	45.0 mm (1.8 in)
1942	31.0 mm (1.2 in)
1943	35.8 mm (1.4 in)
1944	45.0 mm (1.8 in)
1945	59.9 mm (2.4 in)
1946	54.9 mm (2.2 in)
1947	24.9 mm (1.0 in)
1949	54.9 mm (2.2 in)
1950	39.9 mm (1.6 in)
1951	49.8 mm (2.0 in)
1952	55.9 mm (2.2 in)
1953	41.9 mm (1.6 in)
1954	47.8 mm (1.9 in)
1955	57.9 mm (2.3 in)
1956	31.8 mm (1.3 in)
1957	71.9 mm (2.8 in)
1958	64.8 mm (2.6 in)
1959	59.9 mm (2.4 in)
1960	54.9 mm (2.2 in)
1962	20.1 mm (0.8 in)
1963	19.3 mm (0.8 in)
1964	66.3 mm (2.6 in)
1965	33.8 mm (1.3 in)
1966	47.0 mm (1.9 in)
1967	39.9 mm (1.6 in)
1968	27.9 mm (1.1 in)
1969	37.8 mm (1.5 in)
1970	38.4 mm (1.5 in)
1971	27.4 mm (1.1 in)
1972	55.9 mm (2.2 in)
1973	36.8 mm (1.4 in)
1974	26.9 mm (1.1 in)
1975	33.8 mm (1.3 in)
1976	47.0 mm (1.9 in)
1977	63.8 mm (2.5 in)
1978	39.9 mm (1.6 in)
1979	51.8 mm (2.0 in)
1980	18.8 mm (0.7 in)
1981	29.0 mm (1.1 in)
1982	39.9 mm (1.6 in)
1983	26.7 mm (1.1 in)
1984	37.8 mm (1.5 in)
1985	35.8 mm (1.4 in)
1986	41.9 mm (1.6 in)
1987	54.9 mm (2.2 in)
1988	39.9 mm (1.6 in)
1989	45.0 mm (1.8 in)
1990	43.9 mm (1.7 in)
1991	21.8 mm (0.9 in)
1992	19.8 mm (0.8 in)
1993	0.0 mm (0.00 in)
1994	20.8 mm (0.8 in)
1995	9.9 mm (0.39 in)
1996	0.0 mm (0.00 in)
1997	47.8 mm (1.9 in)
1998	18.8 mm (0.7 in)
1999	24.9 mm (1.0 in)
2000	50.8 mm (2.0 in)
2001	26.9 mm (1.1 in)
2002	30.0 mm (1.2 in)
2003	27.9 mm (1.1 in)
2004	54.9 mm (2.2 in)
2005	33.8 mm (1.3 in)
2006	46.5 mm (1.8 in)
2007	50.8 mm (2.0 in)
2008	56.4 mm (2.2 in)
2009	34.8 mm (1.4 in)
2010	42.9 mm (1.7 in)
2011	43.9 mm (1.7 in)
2012	41.9 mm (1.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Naco, 1931 to 2012. The record is 145.4 mm (5.7 in) in 1977, marked on the chart; the median year is 61.1 mm (2.4 in).

Wettest five days (Rx5day) at Naco by year
Year	Wettest five days (Rx5day)
1931	87.7 mm (3.5 in)
1932	99.8 mm (3.9 in)
1933	64.8 mm (2.6 in)
1934	123.7 mm (4.9 in)
1935	59.7 mm (2.4 in)
1936	63.0 mm (2.5 in)
1937	54.6 mm (2.1 in)
1938	43.7 mm (1.7 in)
1939	36.9 mm (1.5 in)
1940	40.3 mm (1.6 in)
1941	53.9 mm (2.1 in)
1942	46.6 mm (1.8 in)
1943	74.7 mm (2.9 in)
1944	79.8 mm (3.1 in)
1945	98.6 mm (3.9 in)
1946	69.9 mm (2.8 in)
1947	39.9 mm (1.6 in)
1949	131.6 mm (5.2 in)
1950	89.7 mm (3.5 in)
1951	59.7 mm (2.4 in)
1952	55.9 mm (2.2 in)
1953	50.8 mm (2.0 in)
1954	78.6 mm (3.1 in)
1955	88.4 mm (3.5 in)
1956	67.4 mm (2.7 in)
1957	71.9 mm (2.8 in)
1958	74.7 mm (2.9 in)
1959	117.8 mm (4.6 in)
1960	94.8 mm (3.7 in)
1962	74.2 mm (2.9 in)
1963	25.6 mm (1.0 in)
1964	92.0 mm (3.6 in)
1965	56.8 mm (2.2 in)
1966	72.7 mm (2.9 in)
1967	47.8 mm (1.9 in)
1968	41.4 mm (1.6 in)
1969	62.7 mm (2.5 in)
1970	44.8 mm (1.8 in)
1971	27.4 mm (1.1 in)
1972	69.6 mm (2.7 in)
1973	91.8 mm (3.6 in)
1974	69.5 mm (2.7 in)
1975	75.2 mm (3.0 in)
1976	53.0 mm (2.1 in)
1977	145.4 mm (5.7 in)
1978	64.5 mm (2.5 in)
1979	56.6 mm (2.2 in)
1980	22.4 mm (0.9 in)
1981	41.5 mm (1.6 in)
1982	52.6 mm (2.1 in)
1983	83.8 mm (3.3 in)
1984	123.2 mm (4.9 in)
1985	56.6 mm (2.2 in)
1986	65.3 mm (2.6 in)
1987	75.4 mm (3.0 in)
1988	63.8 mm (2.5 in)
1989	90.5 mm (3.6 in)
1990	76.4 mm (3.0 in)
1991	46.5 mm (1.8 in)
1992	29.5 mm (1.2 in)
1993	0.0 mm (0.00 in)
1994	39.9 mm (1.6 in)
1995	17.8 mm (0.7 in)
1996	0.0 mm (0.00 in)
1997	58.4 mm (2.3 in)
1998	26.4 mm (1.0 in)
1999	58.4 mm (2.3 in)
2000	71.7 mm (2.8 in)
2001	35.6 mm (1.4 in)
2002	33.5 mm (1.3 in)
2003	28.7 mm (1.1 in)
2004	62.5 mm (2.5 in)
2005	66.3 mm (2.6 in)
2006	75.0 mm (3.0 in)
2007	52.6 mm (2.1 in)
2008	56.4 mm (2.2 in)
2009	57.9 mm (2.3 in)
2010	82.8 mm (3.3 in)
2011	45.2 mm (1.8 in)
2012	52.6 mm (2.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Naco, 1931 to 2012. The record is 153 days in 2000, marked on the chart; the median year is 82 days.

Longest dry spell (CDD) at Naco by year
Year	Longest dry spell (CDD)
1931	49 days
1932	118 days
1933	114 days
1934	118 days
1935	131 days
1936	137 days
1937	108 days
1938	115 days
1939	147 days
1940	88 days
1941	54 days
1942	80 days
1943	114 days
1944	100 days
1945	151 days
1946	60 days
1947	73 days
1949	105 days
1950	92 days
1951	70 days
1952	81 days
1953	53 days
1954	90 days
1955	111 days
1956	146 days
1957	53 days
1958	88 days
1959	51 days
1960	110 days
1962	90 days
1963	47 days
1964	20 days
1965	121 days
1966	138 days
1967	74 days
1968	47 days
1969	74 days
1970	93 days
1971	65 days
1972	103 days
1973	84 days
1974	119 days
1975	82 days
1976	43 days
1977	79 days
1978	50 days
1979	53 days
1980	116 days
1981	107 days
1982	57 days
1983	84 days
1984	127 days
1985	68 days
1986	73 days
1987	50 days
1988	50 days
1989	81 days
1990	37 days
1991	67 days
1992	31 days
1993	17 days
1994	95 days
1995	69 days
1996	14 days
1997	59 days
1998	94 days
1999	100 days
2000	153 days
2001	91 days
2002	106 days
2003	47 days
2004	78 days
2005	115 days
2006	80 days
2007	59 days
2008	89 days
2009	72 days
2010	78 days
2011	84 days
2012	64 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

51 years with a frost

Across 51 years with a frost, the median last spring frost at Naco falls on 29 March and the median first autumn frost on 18 November, which leaves a median of 238 days between them.

Fitted over all years, the growing season changes by -1.0 days per decade at this station.

Frost dates and growing season at Naco
Measure	Median, all years	Earliest period	Recent period (1972 to 2011)	Recent against earliest	Fitted trend
Last spring frost	29 March	n/a	30 March	n/a	+1.3 days per decade
First autumn frost	18 November	n/a	20 November	n/a	+0.4 days per decade
Growing days	238 days	n/a	236 days	n/a	-1.0 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

61 years, 1931 to 2012

A day with at least 41.5 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 81.6 mm (3.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Naco: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	41.5 mm (1.6 in)
5 years	54.5 mm (2.1 in)
10 years	62.1 mm (2.4 in)
25 years	70.7 mm (2.8 in)
50 years	76.4 mm (3.0 in)
100 years	81.6 mm (3.2 in)	Longer than the 61 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, 61 years of values from 1931 to 2012.

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: 99.8 mm (3.9 in) in 1932; 71.9 mm (2.8 in) in 1957; 64.8 mm (2.6 in) in 1958.

Station Changes

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

Download the Data

Data for Naco standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Naco 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 2026-10-17 (17 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).