Nacozari (Smn) Weather Records (MXM00076118)

Record envelope, standing records and threshold days for Nacozari (Smn) (MXM00076118), Mexico, with 84 years of record.

Key Facts for Nacozari (Smn)

Nacozari (Smn) (MXM00076118) is a weather station in Mexico at 30.37 latitude and -109.68 longitude, 1,100 m (3,608 ft) above sea level.
The station reports from 1943 to 2026, 84 years of record.
1,464 records set at Nacozari (Smn) still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Nacozari (Smn) set a daily record high minimum temperature of 22.0 C (71.6 F) on 17 May 2026.

About the Station

Location: Mexico, 30.37 latitude, -109.68 longitude.
Elevation: 1,100 m (3,608 ft).
Period of record: 1943 to 2026, 84 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 Nacozari (Smn). 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 Nacozari (Smn), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	37.2 C (99.0 F)	-10.0 C (14.0 F)	n/a	n/a
Feb	37.8 C (100.0 F)	-6.1 C (21.0 F)	n/a	n/a
Mar	41.7 C (107.1 F)	-6.1 C (21.0 F)	n/a	n/a
Apr	45.6 C (114.1 F)	-1.1 C (30.0 F)	37.0 C (98.6 F)	13.4 C (56.1 F)
May	45.6 C (114.1 F)	0.0 C (32.0 F)	33.1 C (91.6 F)	16.7 C (62.1 F)
Jun	50.0 C (122.0 F)	5.0 C (41.0 F)	n/a	n/a
Jul	50.0 C (122.0 F)	10.0 C (50.0 F)	n/a	n/a
Aug	45.6 C (114.1 F)	8.9 C (48.0 F)	n/a	n/a
Sep	45.6 C (114.1 F)	10.0 C (50.0 F)	n/a	n/a
Oct	45.0 C (113.0 F)	0.0 C (32.0 F)	n/a	n/a
Nov	37.8 C (100.0 F)	-4.4 C (24.1 F)	n/a	n/a
Dec	37.8 C (100.0 F)	-5.0 C (23.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Nacozari (Smn) still stand. 1960 holds the most, with 169.

Standing records at Nacozari (Smn) by the year they were set
Year set	Standing records
1943	19
1944	31
1945	16
1946	46
1947	21
1948	22
1949	32
1950	22
1951	27
1952	30
1959	70
1960	169
1961	39
1962	31
1963	35
1964	85
1965	32
1966	21
1967	29
1968	30
1969	20
1970	22
1971	33
1972	17
1973	42
1974	10
1975	14
1976	37
1977	62
1978	1
1979	25
1980	37
1981	9
1982	26
1983	12
1984	11
1985	2
1986	2
1989	3
1990	2
1991	8
1992	19
1993	24
1994	6
1995	26
1996	15
1997	15
1998	17
1999	8
2000	23
2001	10
2002	9
2003	10
2006	1
2007	12
2008	12
2009	6
2023	2
2024	18
2025	18
2026	11

All-Time Record Progression

3 new records

3 all-time records were set at Nacozari (Smn) between 9 August 1983 and 12 August 2009. Each dot is a new record.

When Nacozari (Smn) set new all-time records
Date	Kind	Detail
1983-08-09	Record daily precipitation	Record daily precipitation 81.5 mm (3.2 in)
1996-07-13	Record daily precipitation	Record daily precipitation 93.0 mm (3.7 in)
2009-08-12	Record daily precipitation	Record daily precipitation 94.5 mm (3.7 in)

Wettest Day of Each Month

Aug: 94.5 mm (3.7 in)

The wettest day on record for each calendar month at Nacozari (Smn). The most was 94.5 mm (3.7 in) on 12 August 2009.

Record daily precipitation for each month at Nacozari (Smn)
Month	Record daily precipitation (mm)	Date
Jan	69.3 mm (2.7 in)	24 January 1962
Feb	78.0 mm (3.1 in)	13 February 1980
Mar	63.5 mm (2.5 in)	3 March 1983
Apr	22.4 mm (0.9 in)	30 April 1981
May	37.3 mm (1.5 in)	4 May 1973
Jun	53.8 mm (2.1 in)	26 June 2000
Jul	93.0 mm (3.7 in)	13 July 1996
Aug	94.5 mm (3.7 in)	12 August 2009
Sep	79.8 mm (3.1 in)	26 September 1946
Oct	53.3 mm (2.1 in)	3 October 1983
Nov	38.4 mm (1.5 in)	30 November 2007
Dec	79.2 mm (3.1 in)	14 December 1967

Period of Record Coverage

1943 to 2026

62 years of record at Nacozari (Smn), 1943 to 2026. 22 years have data for under 90 percent of days and are left out of rankings: 1947, 1959, 1960, 1961, 1978, 1981, 1982, 1985 and others.

Days with data per year at Nacozari (Smn)
Year	Days with data	Share of year	Complete
1943	365	100%	Yes
1944	335	92%	Yes
1945	365	100%	Yes
1946	364	100%	Yes
1947	313	86%	No
1948	365	100%	Yes
1949	364	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1959	91	25%	No
1960	171	47%	No
1961	194	53%	No
1962	362	99%	Yes
1963	361	99%	Yes
1964	360	98%	Yes
1965	363	99%	Yes
1966	364	100%	Yes
1967	364	100%	Yes
1968	335	92%	Yes
1969	331	91%	Yes
1970	364	100%	Yes
1971	365	100%	Yes
1972	363	99%	Yes
1973	365	100%	Yes
1974	364	100%	Yes
1975	334	92%	Yes
1976	330	90%	Yes
1977	344	94%	Yes
1978	6	2%	No
1979	363	99%	Yes
1980	366	100%	Yes
1981	318	87%	No
1982	223	61%	No
1983	346	95%	Yes
1984	334	91%	Yes
1985	60	16%	No
1986	35	10%	No
1987	1	0%	No
1989	38	10%	No
1990	7	2%	No
1991	232	64%	No
1992	364	99%	Yes
1993	336	92%	Yes
1994	325	89%	No
1995	357	98%	Yes
1996	363	99%	Yes
1997	352	96%	Yes
1998	304	83%	No
1999	338	93%	Yes
2000	341	93%	Yes
2001	328	90%	No
2002	330	90%	Yes
2003	204	56%	No
2006	81	22%	No
2007	365	100%	Yes
2008	359	98%	Yes
2009	334	92%	Yes
2023	5	1%	No
2024	45	12%	No
2025	99	27%	No
2026	19	5%	No

Latest Records

Latest records at Nacozari (Smn)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 May 2026	Nacozari (Smn), MX	daily high min	22.0 C (71.6 F)	2.0 C (3.6 F)	77 years	36 of 100 (Notable)
16 May 2026	Nacozari (Smn), MX	daily high min	23.5 C (74.3 F)	3.5 C (6.3 F)	48 years	31 of 100 (Routine)
15 May 2026	Nacozari (Smn), MX	daily high min	22.5 C (72.5 F)	0.8 C (1.4 F)	48 years	24 of 100 (Routine)
10 May 2026	Nacozari (Smn), MX	daily high min	19.5 C (67.1 F)	2.5 C (4.5 F)	36 years	25 of 100 (Routine)
9 May 2026	Nacozari (Smn), MX	daily high min	20.6 C (69.1 F)	1.7 C (3.1 F)	48 years	26 of 100 (Routine)
1 May 2026	Nacozari (Smn), MX	daily high min	20.6 C (69.1 F)	3.4 C (6.1 F)	48 years	31 of 100 (Routine)
29 April 2026	Nacozari (Smn), MX	daily high min	18.9 C (66.0 F)	1.1 C (2.0 F)	33 years	21 of 100 (Routine)
28 April 2026	Nacozari (Smn), MX	daily high min	18.7 C (65.7 F)	2.0 C (3.6 F)	33 years	23 of 100 (Routine)
23 April 2026	Nacozari (Smn), MX	daily high min	16.4 C (61.5 F)	1.4 C (2.5 F)	32 years	21 of 100 (Routine)
20 April 2026	Nacozari (Smn), MX	monthly high min	21.9 C (71.4 F)	0.2 C (0.4 F)	33 years	28 of 100 (Routine)
13 April 2026	Nacozari (Smn), MX	daily high min	19.7 C (67.5 F)	5.8 C (10.4 F)	33 years	34 of 100 (Routine)
17 November 2025	Nacozari (Smn), MX	daily high min	15.4 C (59.7 F)	3.4 C (6.1 F)	44 years	30 of 100 (Routine)
14 November 2025	Nacozari (Smn), MX	daily high min	14.7 C (58.5 F)	1.4 C (2.5 F)	26 years	18 of 100 (Routine)
14 September 2025	Nacozari (Smn), MX	daily high min	21.5 C (70.7 F)	0.9 C (1.6 F)	79 years	34 of 100 (Routine)
3 September 2025	Nacozari (Smn), MX	daily low max	24.4 C (75.9 F)	0.6 C (1.1 F)	31 years	18 of 100 (Routine)
28 August 2025	Nacozari (Smn), MX	daily high min	23.9 C (75.0 F)	1.1 C (2.0 F)	32 years	22 of 100 (Routine)
25 August 2025	Nacozari (Smn), MX	daily high min	21.9 C (71.4 F)	0.2 C (0.4 F)	79 years	31 of 100 (Routine)
21 August 2025	Nacozari (Smn), MX	daily high min (Tie)	23.9 C (75.0 F)	tie	64 years	6 of 100 (Routine)
9 August 2025	Nacozari (Smn), MX	daily high min	24.7 C (76.5 F)	0.8 C (1.4 F)	32 years	20 of 100 (Routine)
8 August 2025	Nacozari (Smn), MX	daily high max	41.5 C (106.7 F)	0.9 C (1.6 F)	32 years	19 of 100 (Routine)

Climate Trend

30 complete years, 1943 to 2008

One stripe for each of 30 complete years at Nacozari (Smn), 1943 to 2008. Blue stripes are years cooler than the station's own mean of 19.1 C (66.4 F); red stripes are warmer. The coolest year was 1964, at 17.6 C (63.7 F), and the warmest was 1992, at 21.0 C (69.8 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Nacozari (Smn) as warming stripes, 1943 to 2008
Year	Annual mean temperature	Difference from the station mean
1943	19.2 C	+0.10 C
1945	18.9 C	-0.20 C
1946	19.4 C	+0.27 C
1948	19.7 C	+0.58 C
1949	18.6 C	-0.55 C
1950	19.4 C	+0.27 C
1951	18.8 C	-0.30 C
1952	18.6 C	-0.54 C
1962	18.8 C	-0.32 C
1963	19.3 C	+0.14 C
1964	17.6 C	-1.53 C
1965	18.3 C	-0.84 C
1966	17.8 C	-1.29 C
1967	18.3 C	-0.87 C
1970	18.0 C	-1.13 C
1971	17.8 C	-1.32 C
1972	18.4 C	-0.71 C
1973	17.7 C	-1.47 C
1974	19.1 C	-0.06 C
1979	20.5 C	+1.42 C
1980	20.7 C	+1.61 C
1983	19.7 C	+0.62 C
1992	21.0 C	+1.89 C
1995	19.6 C	+0.50 C
1996	20.0 C	+0.85 C
2000	20.0 C	+0.83 C
2001	19.1 C	-0.07 C
2002	19.8 C	+0.63 C
2007	19.9 C	+0.74 C
2008	19.9 C	+0.75 C

The annual mean temperature here has risen by 0.20 C (0.04 to 0.35) per decade over 1943 to 2008. In Fahrenheit: 0.4 F (0.1 to 0.6) per decade. The slope is a straight line fitted to 30 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Nacozari (Smn)
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.20 C (0.04 to 0.35) per decade	0.4 F (0.1 to 0.6) per decade	1943 to 2008	30	Rise
Mean daily maximum	0.1 C (-0.1 to 0.3) per decade	0.1 F (-0.2 to 0.5) per decade	1943 to 2008	30	Not clearly different from zero
Mean daily minimum	0.3 C (0.2 to 0.5) per decade	0.6 F (0.3 to 0.9) per decade	1943 to 2008	30	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 2026

Yearly extremes at Nacozari (Smn): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	50.0 C (122.0 F)	1960	41.7 C (107.1 F)	62
Coldest night (TNn)	-10.0 C (14.0 F)	1943	-1.1 C (30.0 F)	62
Wettest day (Rx1day)	94.5 mm (3.7 in)	2009	46.0 mm (1.8 in)	59
Wettest five days (Rx5day)	204.6 mm (8.1 in)	1967	76.2 mm (3.0 in)	57
Longest dry spell (CDD)	150 days	1972	72 days	59

Hottest day (TXx)

The hottest day of the year at Nacozari (Smn), 1943 to 2026. The record is 50.0 C (122.0 F) in 1960, marked on the chart; the median year is 41.7 C (107.1 F).

Hottest day (TXx) at Nacozari (Smn) by year
Year	Hottest day (TXx)
1943	40.6 C (105.1 F)
1944	43.9 C (111.0 F)
1945	40.6 C (105.1 F)
1946	41.7 C (107.1 F)
1947	41.7 C (107.1 F)
1948	42.8 C (109.0 F)
1949	40.0 C (104.0 F)
1950	40.6 C (105.1 F)
1951	42.8 C (109.0 F)
1952	40.6 C (105.1 F)
1959	45.0 C (113.0 F)
1960	50.0 C (122.0 F)
1961	49.4 C (120.9 F)
1962	42.2 C (108.0 F)
1963	41.7 C (107.1 F)
1964	41.1 C (106.0 F)
1965	42.8 C (109.0 F)
1966	40.0 C (104.0 F)
1967	38.9 C (102.0 F)
1968	41.7 C (107.1 F)
1969	41.1 C (106.0 F)
1970	43.9 C (111.0 F)
1971	40.0 C (104.0 F)
1972	40.0 C (104.0 F)
1973	41.7 C (107.1 F)
1974	42.2 C (108.0 F)
1975	40.0 C (104.0 F)
1976	43.9 C (111.0 F)
1977	42.8 C (109.0 F)
1978	41.0 C (105.8 F)
1979	43.9 C (111.0 F)
1980	45.0 C (113.0 F)
1981	41.0 C (105.8 F)
1982	46.1 C (115.0 F)
1983	42.8 C (109.0 F)
1984	41.7 C (107.1 F)
1985	42.6 C (108.7 F)
1986	31.9 C (89.4 F)
1987	36.2 C (97.2 F)
1989	43.0 C (109.4 F)
1990	24.4 C (75.9 F)
1991	41.7 C (107.1 F)
1992	42.8 C (109.0 F)
1993	45.0 C (113.0 F)
1994	43.9 C (111.0 F)
1995	45.6 C (114.1 F)
1996	41.1 C (106.0 F)
1997	42.8 C (109.0 F)
1998	42.2 C (108.0 F)
1999	40.0 C (104.0 F)
2000	40.6 C (105.1 F)
2001	40.0 C (104.0 F)
2002	42.2 C (108.0 F)
2003	41.7 C (107.1 F)
2006	31.7 C (89.1 F)
2007	43.9 C (111.0 F)
2008	42.8 C (109.0 F)
2009	40.6 C (105.1 F)
2023	25.0 C (77.0 F)
2024	37.0 C (98.6 F)
2025	43.4 C (110.1 F)
2026	37.0 C (98.6 F)

Coldest night (TNn)

The coldest night of the year at Nacozari (Smn), 1943 to 2026. The record is -10.0 C (14.0 F) in 1943, marked on the chart; the median year is -1.1 C (30.0 F).

Coldest night (TNn) at Nacozari (Smn) by year
Year	Coldest night (TNn)
1943	-10.0 C (14.0 F)
1944	-3.3 C (26.1 F)
1945	-3.3 C (26.1 F)
1946	-4.4 C (24.1 F)
1947	-6.1 C (21.0 F)
1948	-7.2 C (19.0 F)
1949	-10.0 C (14.0 F)
1950	-2.2 C (28.0 F)
1951	-5.0 C (23.0 F)
1952	-4.4 C (24.1 F)
1959	1.7 C (35.1 F)
1960	0.0 C (32.0 F)
1961	-3.3 C (26.1 F)
1962	-2.8 C (27.0 F)
1963	-6.7 C (19.9 F)
1964	-6.1 C (21.0 F)
1965	-0.6 C (30.9 F)
1966	-3.9 C (25.0 F)
1967	-2.8 C (27.0 F)
1968	-5.0 C (23.0 F)
1969	-3.3 C (26.1 F)
1970	-4.4 C (24.1 F)
1971	-5.0 C (23.0 F)
1972	-5.0 C (23.0 F)
1973	-0.6 C (30.9 F)
1974	0.0 C (32.0 F)
1975	0.0 C (32.0 F)
1976	0.0 C (32.0 F)
1977	0.0 C (32.0 F)
1978	8.0 C (46.4 F)
1979	-3.3 C (26.1 F)
1980	0.0 C (32.0 F)
1981	0.0 C (32.0 F)
1982	-2.8 C (27.0 F)
1983	-1.1 C (30.0 F)
1984	-2.2 C (28.0 F)
1985	-1.0 C (30.2 F)
1986	-1.0 C (30.2 F)
1987	16.5 C (61.7 F)
1989	0.6 C (33.1 F)
1990	-0.5 C (31.1 F)
1991	0.0 C (32.0 F)
1992	0.0 C (32.0 F)
1993	2.8 C (37.0 F)
1994	0.0 C (32.0 F)
1995	-1.1 C (30.0 F)
1996	-1.1 C (30.0 F)
1997	-3.9 C (25.0 F)
1998	-1.1 C (30.0 F)
1999	-1.1 C (30.0 F)
2000	-0.6 C (30.9 F)
2001	-1.7 C (28.9 F)
2002	-2.8 C (27.0 F)
2003	0.0 C (32.0 F)
2006	-2.2 C (28.0 F)
2007	-2.2 C (28.0 F)
2008	-1.1 C (30.0 F)
2009	-2.2 C (28.0 F)
2023	10.0 C (50.0 F)
2024	2.0 C (35.6 F)
2025	4.1 C (39.4 F)
2026	13.4 C (56.1 F)

Wettest day (Rx1day)

The wettest day of the year at Nacozari (Smn), 1943 to 2026. The record is 94.5 mm (3.7 in) in 2009, marked on the chart; the median year is 46.0 mm (1.8 in).

Wettest day (Rx1day) at Nacozari (Smn) by year
Year	Wettest day (Rx1day)
1943	65.8 mm (2.6 in)
1944	40.9 mm (1.6 in)
1945	34.8 mm (1.4 in)
1946	79.8 mm (3.1 in)
1947	43.4 mm (1.7 in)
1948	38.9 mm (1.5 in)
1949	50.8 mm (2.0 in)
1950	37.8 mm (1.5 in)
1951	46.0 mm (1.8 in)
1952	65.3 mm (2.6 in)
1959	24.9 mm (1.0 in)
1960	64.8 mm (2.6 in)
1961	46.5 mm (1.8 in)
1962	69.3 mm (2.7 in)
1963	34.3 mm (1.4 in)
1964	37.8 mm (1.5 in)
1965	39.9 mm (1.6 in)
1966	63.0 mm (2.5 in)
1967	79.2 mm (3.1 in)
1968	39.4 mm (1.6 in)
1969	48.8 mm (1.9 in)
1970	49.8 mm (2.0 in)
1971	49.8 mm (2.0 in)
1972	49.8 mm (2.0 in)
1973	55.9 mm (2.2 in)
1974	69.3 mm (2.7 in)
1975	39.9 mm (1.6 in)
1976	35.3 mm (1.4 in)
1977	40.9 mm (1.6 in)
1978	0.5 mm (0.02 in)
1979	59.4 mm (2.3 in)
1980	78.0 mm (3.1 in)
1981	38.9 mm (1.5 in)
1982	64.8 mm (2.6 in)
1983	81.5 mm (3.2 in)
1984	45.7 mm (1.8 in)
1985	20.6 mm (0.8 in)
1986	23.6 mm (0.9 in)
1987	0.0 mm (0.00 in)
1989	12.7 mm (0.5 in)
1990	6.6 mm (0.26 in)
1991	65.8 mm (2.6 in)
1992	48.8 mm (1.9 in)
1993	59.9 mm (2.4 in)
1994	35.3 mm (1.4 in)
1995	36.6 mm (1.4 in)
1996	93.0 mm (3.7 in)
1997	44.7 mm (1.8 in)
1998	91.9 mm (3.6 in)
1999	35.3 mm (1.4 in)
2000	66.3 mm (2.6 in)
2001	53.1 mm (2.1 in)
2002	40.9 mm (1.6 in)
2003	28.4 mm (1.1 in)
2006	31.8 mm (1.3 in)
2007	78.0 mm (3.1 in)
2008	51.8 mm (2.0 in)
2009	94.5 mm (3.7 in)
2023	n/a
2024	n/a
2025	n/a
2026	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at Nacozari (Smn), 1943 to 2026. The record is 204.6 mm (8.1 in) in 1967, marked on the chart; the median year is 76.2 mm (3.0 in).

Wettest five days (Rx5day) at Nacozari (Smn) by year
Year	Wettest five days (Rx5day)
1943	86.6 mm (3.4 in)
1944	68.8 mm (2.7 in)
1945	66.3 mm (2.6 in)
1946	96.9 mm (3.8 in)
1947	61.0 mm (2.4 in)
1948	71.4 mm (2.8 in)
1949	107.4 mm (4.2 in)
1950	76.0 mm (3.0 in)
1951	49.3 mm (1.9 in)
1952	85.1 mm (3.4 in)
1959	50.3 mm (2.0 in)
1960	101.6 mm (4.0 in)
1961	82.6 mm (3.3 in)
1962	106.9 mm (4.2 in)
1963	61.0 mm (2.4 in)
1964	59.0 mm (2.3 in)
1965	53.7 mm (2.1 in)
1966	133.7 mm (5.3 in)
1967	204.6 mm (8.1 in)
1968	66.1 mm (2.6 in)
1969	76.2 mm (3.0 in)
1970	115.4 mm (4.5 in)
1971	49.8 mm (2.0 in)
1972	57.5 mm (2.3 in)
1973	90.7 mm (3.6 in)
1974	76.2 mm (3.0 in)
1975	117.6 mm (4.6 in)
1976	73.3 mm (2.9 in)
1977	126.4 mm (5.0 in)
1978	n/a
1979	72.4 mm (2.9 in)
1980	128.6 mm (5.1 in)
1981	65.1 mm (2.6 in)
1982	73.9 mm (2.9 in)
1983	111.5 mm (4.4 in)
1984	100.6 mm (4.0 in)
1985	0.8 mm (0.03 in)
1986	0.0 mm (0.00 in)
1987	n/a
1989	12.7 mm (0.5 in)
1990	6.9 mm (0.27 in)
1991	86.4 mm (3.4 in)
1992	100.6 mm (4.0 in)
1993	85.6 mm (3.4 in)
1994	55.2 mm (2.2 in)
1995	75.7 mm (3.0 in)
1996	140.3 mm (5.5 in)
1997	60.2 mm (2.4 in)
1998	131.5 mm (5.2 in)
1999	83.6 mm (3.3 in)
2000	111.8 mm (4.4 in)
2001	85.1 mm (3.4 in)
2002	72.9 mm (2.9 in)
2003	45.5 mm (1.8 in)
2006	31.8 mm (1.3 in)
2007	98.8 mm (3.9 in)
2008	116.3 mm (4.6 in)
2009	104.6 mm (4.1 in)
2023	n/a
2024	n/a
2025	n/a
2026	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at Nacozari (Smn), 1943 to 2026. The record is 150 days in 1972, marked on the chart; the median year is 72 days.

Longest dry spell (CDD) at Nacozari (Smn) by year
Year	Longest dry spell (CDD)
1943	112 days
1944	72 days
1945	94 days
1946	55 days
1947	55 days
1948	107 days
1949	100 days
1950	91 days
1951	66 days
1952	41 days
1959	28 days
1960	114 days
1961	90 days
1962	97 days
1963	71 days
1964	81 days
1965	84 days
1966	72 days
1967	115 days
1968	84 days
1969	58 days
1970	91 days
1971	130 days
1972	150 days
1973	102 days
1974	116 days
1975	87 days
1976	41 days
1977	54 days
1978	4 days
1979	58 days
1980	102 days
1981	33 days
1982	89 days
1983	56 days
1984	89 days
1985	89 days
1986	5 days
1987	1 day
1989	5 days
1990	4 days
1991	39 days
1992	55 days
1993	35 days
1994	57 days
1995	70 days
1996	94 days
1997	44 days
1998	47 days
1999	76 days
2000	48 days
2001	74 days
2002	144 days
2003	78 days
2006	33 days
2007	79 days
2008	126 days
2009	69 days
2023	n/a
2024	n/a
2025	n/a
2026	5 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

28 years with a frost

Across 28 years with a frost, the median last spring frost at Nacozari (Smn) falls on 9 March and the median first autumn frost on 4 December, which leaves a median of 282 days between them.

Fitted over all years, the growing season changes by +8.5 days per decade at this station.

Frost dates and growing season at Nacozari (Smn)
Measure	Median, all years	Earliest period	Recent period (1943 to 2008)	Recent against earliest	Fitted trend
Last spring frost	9 March	n/a	9 March	n/a	-7.1 days per decade
First autumn frost	4 December	n/a	4 December	n/a	+1.3 days per decade
Growing days	282 days	n/a	282 days	n/a	+8.5 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

43 years, 1943 to 2009

A day with at least 50.9 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 113.8 mm (4.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Nacozari (Smn): the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	50.9 mm (2.0 in)
5 years	66.1 mm (2.6 in)
10 years	76.8 mm (3.0 in)
25 years	91.1 mm (3.6 in)
50 years	102.2 mm (4.0 in)	Longer than the 43 years of record
100 years	113.8 mm (4.5 in)	Longer than the 43 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, 43 years of values from 1943 to 2009.

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: 94.5 mm (3.7 in) in 2009; 93.0 mm (3.7 in) in 1996; 81.5 mm (3.2 in) in 1983.

Download the Data

Data for Nacozari (Smn) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Nacozari (Smn) 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).