Guerrero (Smn) Weather Records (MXN00008028)

Record envelope, standing records and threshold days for Guerrero (Smn) (MXN00008028), Mexico, with 100 years of record.

Key Facts for Guerrero (Smn)

Guerrero (Smn) (MXN00008028) is a weather station in Mexico at 28.53 latitude and -107.48 longitude, 2,004 m (6,574 ft) above sea level.
The station reports from 1904 to 2003, 100 years of record.
1,464 records set at Guerrero (Smn) still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Guerrero (Smn) set a daily record high maximum temperature of 28.3 C (82.9 F) on 30 November 2003.

About the Station

Location: Mexico, 28.53 latitude, -107.48 longitude.
Elevation: 2,004 m (6,574 ft).
Period of record: 1904 to 2003, 100 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 Guerrero (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 Guerrero (Smn), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	27.2 C (81.0 F)	-18.9 C (-2.0 F)	n/a	n/a
Feb	31.7 C (89.1 F)	-16.1 C (3.0 F)	n/a	n/a
Mar	31.1 C (88.0 F)	-14.4 C (6.1 F)	n/a	n/a
Apr	35.0 C (95.0 F)	-12.2 C (10.0 F)	n/a	n/a
May	38.9 C (102.0 F)	-5.0 C (23.0 F)	n/a	n/a
Jun	45.0 C (113.0 F)	0.0 C (32.0 F)	n/a	n/a
Jul	45.0 C (113.0 F)	5.0 C (41.0 F)	n/a	n/a
Aug	35.6 C (96.1 F)	3.9 C (39.0 F)	n/a	n/a
Sep	33.3 C (91.9 F)	-1.1 C (30.0 F)	n/a	n/a
Oct	32.8 C (91.0 F)	-6.7 C (19.9 F)	n/a	n/a
Nov	30.0 C (86.0 F)	-15.0 C (5.0 F)	n/a	n/a
Dec	27.8 C (82.0 F)	-17.8 C (0.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Guerrero (Smn) still stand. 1928 holds the most, with 58.

Standing records at Guerrero (Smn) by the year they were set
Year set	Standing records
1904	11
1905	48
1906	31
1907	11
1908	32
1909	13
1910	5
1924	22
1926	15
1927	28
1928	58
1929	23
1930	32
1931	18
1932	35
1933	44
1934	18
1935	20
1936	25
1937	13
1938	32
1939	38
1940	33
1941	13
1942	29
1943	18
1944	26
1945	34
1946	12
1947	26
1948	19
1949	11
1950	31
1951	33
1952	21
1953	24
1954	30
1955	11
1956	23
1957	24
1958	24
1959	17
1960	10
1961	19
1962	16
1963	15
1964	11
1965	9
1966	14
1967	18
1968	10
1969	13
1970	9
1971	11
1972	14
1973	12
1974	6
1975	7
1976	7
1977	10
1978	7
1979	13
1980	21
1981	5
1982	4
1983	6
1984	11
1985	5
1986	6
1987	13
1988	10
1989	6
1990	5
1991	10
1992	5
1993	3
1994	5
1995	9
1996	8
1997	11
1998	16
1999	4
2003	39

All-Time Record Progression

3 new records

3 all-time records were set at Guerrero (Smn) between 1 January 1948 and 17 August 1966. Each dot is a new record.

When Guerrero (Smn) set new all-time records
Date	Kind	Detail
1948-01-01	Record low minimum temperature	Record low minimum temperature -18.3 C (-0.9 F)
1949-01-30	Record low minimum temperature	Record low minimum temperature -18.9 C (-2.0 F)
1966-08-17	Record daily precipitation	Record daily precipitation 89.9 mm (3.5 in)

Wettest Day of Each Month

Aug: 89.9 mm (3.5 in)

The wettest day on record for each calendar month at Guerrero (Smn). The most was 89.9 mm (3.5 in) on 17 August 1966.

Record daily precipitation for each month at Guerrero (Smn)
Month	Record daily precipitation (mm)	Date
Jan	34.8 mm (1.4 in)	11 January 1982
Feb	27.9 mm (1.1 in)	8 February 1966
Mar	67.8 mm (2.7 in)	7 March 1995
Apr	21.8 mm (0.9 in)	21 April 1987
May	36.8 mm (1.4 in)	18 May 1979
Jun	67.6 mm (2.7 in)	18 June 1988
Jul	55.9 mm (2.2 in)	10 July 1999
Aug	89.9 mm (3.5 in)	17 August 1966
Sep	75.9 mm (3.0 in)	3 September 1941
Oct	54.9 mm (2.2 in)	2 October 1955
Nov	45.0 mm (1.8 in)	25 November 1907
Dec	46.0 mm (1.8 in)	10 December 1963

Period of Record Coverage

1924 to 2003

76 years of record at Guerrero (Smn), 1924 to 2003. 10 years have data for under 90 percent of days and are left out of rankings: 1929, 1985, 1989, 1990, 1992, 1993, 1994, 1995 and others.

Days with data per year at Guerrero (Smn)
Year	Days with data	Share of year	Complete
1924	363	99%	Yes
1926	365	100%	Yes
1927	365	100%	Yes
1928	366	100%	Yes
1929	272	75%	No
1930	365	100%	Yes
1931	364	100%	Yes
1932	365	100%	Yes
1933	365	100%	Yes
1934	365	100%	Yes
1935	365	100%	Yes
1936	365	100%	Yes
1937	364	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	364	99%	Yes
1945	364	100%	Yes
1946	365	100%	Yes
1947	333	91%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	334	92%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	365	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	365	100%	Yes
1961	365	100%	Yes
1962	363	99%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	356	98%	Yes
1966	365	100%	Yes
1967	364	100%	Yes
1968	366	100%	Yes
1969	362	99%	Yes
1970	364	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	364	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	335	92%	Yes
1977	365	100%	Yes
1978	364	100%	Yes
1979	365	100%	Yes
1980	365	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	359	98%	Yes
1984	366	100%	Yes
1985	304	83%	No
1986	365	100%	Yes
1987	360	99%	Yes
1988	359	98%	Yes
1989	120	33%	No
1990	305	84%	No
1991	364	100%	Yes
1992	244	67%	No
1993	299	82%	No
1994	304	83%	No
1995	324	89%	No
1996	332	91%	Yes
1997	358	98%	Yes
1998	361	99%	Yes
1999	211	58%	No
2003	301	82%	No

Latest Records

Latest records at Guerrero (Smn)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 November 2003	Guerrero (Smn), MX	daily high max	28.3 C (82.9 F)	3.3 C (5.9 F)	42 years	28 of 100 (Routine)
29 November 2003	Guerrero (Smn), MX	daily high max (Tie)	25.6 C (78.1 F)	tie	53 years	6 of 100 (Routine)
23 November 2003	Guerrero (Smn), MX	daily high max (Tie)	25.6 C (78.1 F)	tie	48 years	5 of 100 (Routine)
20 November 2003	Guerrero (Smn), MX	daily high max (Tie)	26.1 C (79.0 F)	tie	48 years	5 of 100 (Routine)
16 November 2003	Guerrero (Smn), MX	daily high max	26.7 C (80.1 F)	0.6 C (1.1 F)	52 years	24 of 100 (Routine)
15 November 2003	Guerrero (Smn), MX	daily high max	26.7 C (80.1 F)	0.6 C (1.1 F)	64 years	28 of 100 (Routine)
15 November 2003	Guerrero (Smn), MX	daily high min	8.9 C (48.0 F)	0.6 C (1.1 F)	44 years	24 of 100 (Routine)
14 November 2003	Guerrero (Smn), MX	daily high max	26.7 C (80.1 F)	1.1 C (2.0 F)	37 years	21 of 100 (Routine)
10 November 2003	Guerrero (Smn), MX	daily high max	28.9 C (84.0 F)	1.1 C (2.0 F)	29 years	18 of 100 (Routine)
9 November 2003	Guerrero (Smn), MX	daily high min	10.0 C (50.0 F)	0.6 C (1.1 F)	28 years	19 of 100 (Routine)
5 November 2003	Guerrero (Smn), MX	daily high min (Tie)	6.7 C (44.1 F)	tie	73 years	8 of 100 (Routine)
3 November 2003	Guerrero (Smn), MX	daily high max	28.9 C (84.0 F)	2.2 C (4.0 F)	25 years	20 of 100 (Routine)
2 November 2003	Guerrero (Smn), MX	daily high max	27.8 C (82.0 F)	0.6 C (1.1 F)	50 years	24 of 100 (Routine)
23 October 2003	Guerrero (Smn), MX	daily low max	12.2 C (54.0 F)	0.6 C (1.1 F)	21 years	15 of 100 (Routine)
16 October 2003	Guerrero (Smn), MX	daily low max	15.0 C (59.0 F)	2.2 C (4.0 F)	74 years	37 of 100 (Notable)
22 September 2003	Guerrero (Smn), MX	daily rain	32.8 mm (1.3 in)	6.9 mm (0.27 in)	48 years	30 of 100 (Routine)
18 September 2003	Guerrero (Smn), MX	daily high max (Tie)	31.7 C (89.1 F)	tie	45 years	5 of 100 (Routine)
9 September 2003	Guerrero (Smn), MX	daily high max (Tie)	30.0 C (86.0 F)	tie	50 years	5 of 100 (Routine)
2 September 2003	Guerrero (Smn), MX	daily high min (Tie)	15.0 C (59.0 F)	tie	49 years	6 of 100 (Routine)
29 August 2003	Guerrero (Smn), MX	daily high max (Tie)	31.7 C (89.1 F)	tie	40 years	5 of 100 (Routine)

Climate Trend

62 complete years, 1924 to 1998

One stripe for each of 62 complete years at Guerrero (Smn), 1924 to 1998. Blue stripes are years cooler than the station's own mean of 13.0 C (55.3 F); red stripes are warmer. The coolest year was 1944, at 11.1 C (51.9 F), and the warmest was 1954, at 14.6 C (58.2 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Guerrero (Smn) as warming stripes, 1924 to 1998
Year	Annual mean temperature	Difference from the station mean
1924	12.3 C	-0.65 C
1926	11.8 C	-1.16 C
1927	13.1 C	+0.12 C
1928	12.9 C	-0.05 C
1930	11.3 C	-1.65 C
1931	11.8 C	-1.17 C
1932	11.2 C	-1.79 C
1933	11.4 C	-1.60 C
1934	11.9 C	-1.10 C
1935	11.7 C	-1.22 C
1936	12.0 C	-0.95 C
1937	12.3 C	-0.71 C
1938	11.6 C	-1.38 C
1939	11.4 C	-1.52 C
1940	11.5 C	-1.50 C
1941	11.6 C	-1.35 C
1942	11.3 C	-1.63 C
1943	11.7 C	-1.28 C
1944	11.1 C	-1.88 C
1945	11.6 C	-1.37 C
1946	11.7 C	-1.26 C
1948	13.5 C	+0.51 C
1949	13.4 C	+0.48 C
1950	14.5 C	+1.54 C
1952	14.0 C	+0.99 C
1953	13.8 C	+0.79 C
1954	14.6 C	+1.59 C
1955	13.9 C	+0.90 C
1956	14.0 C	+0.99 C
1957	14.3 C	+1.32 C
1958	14.0 C	+1.07 C
1959	14.2 C	+1.28 C
1960	13.9 C	+0.98 C
1961	13.9 C	+0.96 C
1962	14.0 C	+0.99 C
1963	13.7 C	+0.78 C
1964	12.6 C	-0.34 C
1965	13.3 C	+0.35 C
1966	13.5 C	+0.50 C
1967	13.5 C	+0.49 C
1968	12.9 C	-0.07 C
1969	13.7 C	+0.72 C
1970	13.4 C	+0.39 C
1971	13.2 C	+0.25 C
1972	13.6 C	+0.68 C
1973	12.8 C	-0.19 C
1974	12.9 C	-0.05 C
1975	13.0 C	-0.01 C
1977	13.4 C	+0.47 C
1978	13.9 C	+0.93 C
1979	13.8 C	+0.88 C
1980	14.3 C	+1.33 C
1981	13.9 C	+0.97 C
1982	13.9 C	+0.89 C
1983	12.8 C	-0.13 C
1984	13.1 C	+0.18 C
1986	13.4 C	+0.46 C
1987	12.7 C	-0.31 C
1988	13.5 C	+0.57 C
1991	13.1 C	+0.11 C
1997	13.2 C	+0.26 C
1998	13.8 C	+0.84 C

The annual mean temperature here has risen by 0.3 C (0.2 to 0.4) per decade over 1924 to 1998. In Fahrenheit: 0.5 F (0.3 to 0.7) per decade. The slope is a straight line fitted to 62 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Guerrero (Smn)
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.3 C (0.2 to 0.4) per decade	0.5 F (0.3 to 0.7) per decade	1924 to 1998	62	Rise
Mean daily maximum	0.3 C (0.2 to 0.5) per decade	0.6 F (0.4 to 0.9) per decade	1924 to 1998	62	Rise
Mean daily minimum	0.2 C (0.1 to 0.4) per decade	0.4 F (0.2 to 0.7) per decade	1924 to 1998	62	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

1904 to 2003

Yearly extremes at Guerrero (Smn): 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)	1928	33.9 C (93.0 F)	76
Coldest night (TNn)	-18.9 C (-2.0 F)	1949	-12.2 C (10.0 F)	83
Wettest day (Rx1day)	89.9 mm (3.5 in)	1966	38.9 mm (1.5 in)	83
Wettest five days (Rx5day)	156.1 mm (6.1 in)	1959	69.9 mm (2.8 in)	83
Longest dry spell (CDD)	154 days	1909	69 days	83

Hottest day (TXx)

The hottest day of the year at Guerrero (Smn), 1904 to 2003. The record is 45.0 C (113.0 F) in 1928, marked on the chart; the median year is 33.9 C (93.0 F).

Hottest day (TXx) at Guerrero (Smn) by year
Year	Hottest day (TXx)
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1924	33.9 C (93.0 F)
1926	36.1 C (97.0 F)
1927	36.7 C (98.1 F)
1928	45.0 C (113.0 F)
1929	32.2 C (90.0 F)
1930	30.0 C (86.0 F)
1931	30.0 C (86.0 F)
1932	33.3 C (91.9 F)
1933	32.2 C (90.0 F)
1934	35.0 C (95.0 F)
1935	33.9 C (93.0 F)
1936	35.6 C (96.1 F)
1937	35.0 C (95.0 F)
1938	32.8 C (91.0 F)
1939	35.6 C (96.1 F)
1940	33.9 C (93.0 F)
1941	32.8 C (91.0 F)
1942	33.9 C (93.0 F)
1943	30.6 C (87.1 F)
1944	33.9 C (93.0 F)
1945	35.0 C (95.0 F)
1946	34.4 C (93.9 F)
1947	41.1 C (106.0 F)
1948	35.6 C (96.1 F)
1949	33.9 C (93.0 F)
1950	35.0 C (95.0 F)
1951	37.2 C (99.0 F)
1952	35.0 C (95.0 F)
1953	35.6 C (96.1 F)
1954	35.6 C (96.1 F)
1955	36.1 C (97.0 F)
1956	35.0 C (95.0 F)
1957	35.0 C (95.0 F)
1958	35.0 C (95.0 F)
1959	35.0 C (95.0 F)
1960	36.7 C (98.1 F)
1961	33.9 C (93.0 F)
1962	35.0 C (95.0 F)
1963	34.4 C (93.9 F)
1964	34.4 C (93.9 F)
1965	33.9 C (93.0 F)
1966	33.3 C (91.9 F)
1967	33.9 C (93.0 F)
1968	35.0 C (95.0 F)
1969	35.0 C (95.0 F)
1970	36.7 C (98.1 F)
1971	33.3 C (91.9 F)
1972	32.8 C (91.0 F)
1973	35.0 C (95.0 F)
1974	33.9 C (93.0 F)
1975	32.8 C (91.0 F)
1976	32.8 C (91.0 F)
1977	33.9 C (93.0 F)
1978	35.6 C (96.1 F)
1979	36.1 C (97.0 F)
1980	36.7 C (98.1 F)
1981	35.0 C (95.0 F)
1982	34.4 C (93.9 F)
1983	33.9 C (93.0 F)
1984	33.9 C (93.0 F)
1985	33.9 C (93.0 F)
1986	30.6 C (87.1 F)
1987	32.8 C (91.0 F)
1988	33.9 C (93.0 F)
1989	35.0 C (95.0 F)
1990	33.9 C (93.0 F)
1991	33.9 C (93.0 F)
1992	32.8 C (91.0 F)
1993	30.6 C (87.1 F)
1994	32.8 C (91.0 F)
1995	32.2 C (90.0 F)
1996	33.9 C (93.0 F)
1997	32.8 C (91.0 F)
1998	35.0 C (95.0 F)
1999	33.9 C (93.0 F)
2003	35.6 C (96.1 F)

Coldest night (TNn)

The coldest night of the year at Guerrero (Smn), 1904 to 2003. The record is -18.9 C (-2.0 F) in 1949, marked on the chart; the median year is -12.2 C (10.0 F).

Coldest night (TNn) at Guerrero (Smn) by year
Year	Coldest night (TNn)
1904	-7.2 C (19.0 F)
1905	-14.4 C (6.1 F)
1906	-15.0 C (5.0 F)
1907	-9.4 C (15.1 F)
1908	-9.4 C (15.1 F)
1909	-10.0 C (14.0 F)
1910	-13.3 C (8.1 F)
1924	-12.2 C (10.0 F)
1926	-15.0 C (5.0 F)
1927	-12.2 C (10.0 F)
1928	-12.2 C (10.0 F)
1929	-15.0 C (5.0 F)
1930	-12.8 C (9.0 F)
1931	-11.1 C (12.0 F)
1932	-13.3 C (8.1 F)
1933	-17.8 C (0.0 F)
1934	-16.7 C (1.9 F)
1935	-15.0 C (5.0 F)
1936	-15.0 C (5.0 F)
1937	-11.1 C (12.0 F)
1938	-16.1 C (3.0 F)
1939	-16.1 C (3.0 F)
1940	-14.4 C (6.1 F)
1941	-14.4 C (6.1 F)
1942	-17.2 C (1.0 F)
1943	-13.3 C (8.1 F)
1944	-17.8 C (0.0 F)
1945	-13.9 C (7.0 F)
1946	-16.1 C (3.0 F)
1947	-15.0 C (5.0 F)
1948	-18.3 C (-0.9 F)
1949	-18.9 C (-2.0 F)
1950	-10.0 C (14.0 F)
1951	-12.2 C (10.0 F)
1952	-13.9 C (7.0 F)
1953	-15.0 C (5.0 F)
1954	-13.3 C (8.1 F)
1955	-11.7 C (10.9 F)
1956	-15.0 C (5.0 F)
1957	-10.0 C (14.0 F)
1958	-17.8 C (0.0 F)
1959	-10.0 C (14.0 F)
1960	-10.6 C (12.9 F)
1961	-8.9 C (16.0 F)
1962	-14.4 C (6.1 F)
1963	-10.6 C (12.9 F)
1964	-13.9 C (7.0 F)
1965	-13.9 C (7.0 F)
1966	-11.1 C (12.0 F)
1967	-13.3 C (8.1 F)
1968	-11.1 C (12.0 F)
1969	-12.2 C (10.0 F)
1970	-12.2 C (10.0 F)
1971	-12.2 C (10.0 F)
1972	-10.0 C (14.0 F)
1973	-14.4 C (6.1 F)
1974	-10.6 C (12.9 F)
1975	-14.4 C (6.1 F)
1976	-9.4 C (15.1 F)
1977	-11.1 C (12.0 F)
1978	-13.3 C (8.1 F)
1979	-10.0 C (14.0 F)
1980	-8.3 C (17.1 F)
1981	-7.2 C (19.0 F)
1982	-10.0 C (14.0 F)
1983	-10.0 C (14.0 F)
1984	-9.4 C (15.1 F)
1985	-11.1 C (12.0 F)
1986	-10.0 C (14.0 F)
1987	-13.3 C (8.1 F)
1988	-12.8 C (9.0 F)
1989	-11.1 C (12.0 F)
1990	-12.8 C (9.0 F)
1991	-8.9 C (16.0 F)
1992	-10.0 C (14.0 F)
1993	-10.0 C (14.0 F)
1994	-14.4 C (6.1 F)
1995	-12.2 C (10.0 F)
1996	-11.7 C (10.9 F)
1997	-17.8 C (0.0 F)
1998	-10.6 C (12.9 F)
1999	-12.2 C (10.0 F)
2003	-7.2 C (19.0 F)

Wettest day (Rx1day)

The wettest day of the year at Guerrero (Smn), 1904 to 2003. The record is 89.9 mm (3.5 in) in 1966, marked on the chart; the median year is 38.9 mm (1.5 in).

Wettest day (Rx1day) at Guerrero (Smn) by year
Year	Wettest day (Rx1day)
1904	47.8 mm (1.9 in)
1905	23.4 mm (0.9 in)
1906	37.6 mm (1.5 in)
1907	45.0 mm (1.8 in)
1908	38.9 mm (1.5 in)
1909	34.0 mm (1.3 in)
1910	22.4 mm (0.9 in)
1924	66.8 mm (2.6 in)
1926	31.8 mm (1.3 in)
1927	32.8 mm (1.3 in)
1928	30.5 mm (1.2 in)
1929	29.0 mm (1.1 in)
1930	35.8 mm (1.4 in)
1931	36.8 mm (1.4 in)
1932	33.8 mm (1.3 in)
1933	51.3 mm (2.0 in)
1934	18.8 mm (0.7 in)
1935	18.8 mm (0.7 in)
1936	25.9 mm (1.0 in)
1937	50.8 mm (2.0 in)
1938	34.8 mm (1.4 in)
1939	51.8 mm (2.0 in)
1940	30.0 mm (1.2 in)
1941	75.9 mm (3.0 in)
1942	48.8 mm (1.9 in)
1943	35.3 mm (1.4 in)
1944	50.8 mm (2.0 in)
1945	35.8 mm (1.4 in)
1946	38.9 mm (1.5 in)
1947	37.3 mm (1.5 in)
1948	36.8 mm (1.4 in)
1949	34.0 mm (1.3 in)
1950	35.3 mm (1.4 in)
1951	39.9 mm (1.6 in)
1952	39.1 mm (1.5 in)
1953	30.5 mm (1.2 in)
1954	42.4 mm (1.7 in)
1955	54.9 mm (2.2 in)
1956	21.3 mm (0.8 in)
1957	34.8 mm (1.4 in)
1958	34.8 mm (1.4 in)
1959	49.3 mm (1.9 in)
1960	54.9 mm (2.2 in)
1961	43.4 mm (1.7 in)
1962	47.0 mm (1.9 in)
1963	46.0 mm (1.8 in)
1964	35.8 mm (1.4 in)
1965	26.9 mm (1.1 in)
1966	89.9 mm (3.5 in)
1967	36.8 mm (1.4 in)
1968	51.8 mm (2.0 in)
1969	47.5 mm (1.9 in)
1970	47.5 mm (1.9 in)
1971	39.9 mm (1.6 in)
1972	49.8 mm (2.0 in)
1973	23.9 mm (0.9 in)
1974	67.8 mm (2.7 in)
1975	42.9 mm (1.7 in)
1976	41.9 mm (1.6 in)
1977	48.3 mm (1.9 in)
1978	59.9 mm (2.4 in)
1979	36.8 mm (1.4 in)
1980	30.0 mm (1.2 in)
1981	35.8 mm (1.4 in)
1982	36.3 mm (1.4 in)
1983	54.9 mm (2.2 in)
1984	36.8 mm (1.4 in)
1985	29.5 mm (1.2 in)
1986	45.0 mm (1.8 in)
1987	42.9 mm (1.7 in)
1988	67.6 mm (2.7 in)
1989	34.8 mm (1.4 in)
1990	32.3 mm (1.3 in)
1991	40.1 mm (1.6 in)
1992	79.8 mm (3.1 in)
1993	54.9 mm (2.2 in)
1994	33.8 mm (1.3 in)
1995	67.8 mm (2.7 in)
1996	61.5 mm (2.4 in)
1997	45.0 mm (1.8 in)
1998	23.9 mm (0.9 in)
1999	55.9 mm (2.2 in)
2003	39.9 mm (1.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Guerrero (Smn), 1904 to 2003. The record is 156.1 mm (6.1 in) in 1959, marked on the chart; the median year is 69.9 mm (2.8 in).

Wettest five days (Rx5day) at Guerrero (Smn) by year
Year	Wettest five days (Rx5day)
1904	106.7 mm (4.2 in)
1905	36.6 mm (1.4 in)
1906	63.2 mm (2.5 in)
1907	60.5 mm (2.4 in)
1908	63.4 mm (2.5 in)
1909	66.5 mm (2.6 in)
1910	50.3 mm (2.0 in)
1924	84.6 mm (3.3 in)
1926	51.1 mm (2.0 in)
1927	69.9 mm (2.8 in)
1928	52.8 mm (2.1 in)
1929	41.4 mm (1.6 in)
1930	71.1 mm (2.8 in)
1931	54.3 mm (2.1 in)
1932	91.0 mm (3.6 in)
1933	61.0 mm (2.4 in)
1934	48.8 mm (1.9 in)
1935	42.4 mm (1.7 in)
1936	56.4 mm (2.2 in)
1937	119.5 mm (4.7 in)
1938	86.4 mm (3.4 in)
1939	69.2 mm (2.7 in)
1940	56.4 mm (2.2 in)
1941	98.8 mm (3.9 in)
1942	72.9 mm (2.9 in)
1943	74.5 mm (2.9 in)
1944	61.0 mm (2.4 in)
1945	83.0 mm (3.3 in)
1946	54.7 mm (2.2 in)
1947	59.7 mm (2.4 in)
1948	63.5 mm (2.5 in)
1949	75.7 mm (3.0 in)
1950	75.0 mm (3.0 in)
1951	54.0 mm (2.1 in)
1952	71.9 mm (2.8 in)
1953	38.4 mm (1.5 in)
1954	69.5 mm (2.7 in)
1955	98.3 mm (3.9 in)
1956	49.5 mm (1.9 in)
1957	51.8 mm (2.0 in)
1958	65.3 mm (2.6 in)
1959	156.1 mm (6.1 in)
1960	76.4 mm (3.0 in)
1961	78.5 mm (3.1 in)
1962	87.1 mm (3.4 in)
1963	96.4 mm (3.8 in)
1964	62.3 mm (2.5 in)
1965	71.6 mm (2.8 in)
1966	143.5 mm (5.6 in)
1967	57.0 mm (2.2 in)
1968	97.8 mm (3.9 in)
1969	113.0 mm (4.4 in)
1970	77.2 mm (3.0 in)
1971	57.9 mm (2.3 in)
1972	82.4 mm (3.2 in)
1973	64.9 mm (2.6 in)
1974	101.6 mm (4.0 in)
1975	60.2 mm (2.4 in)
1976	82.8 mm (3.3 in)
1977	86.8 mm (3.4 in)
1978	95.2 mm (3.7 in)
1979	54.9 mm (2.2 in)
1980	49.6 mm (2.0 in)
1981	57.7 mm (2.3 in)
1982	73.9 mm (2.9 in)
1983	77.8 mm (3.1 in)
1984	116.9 mm (4.6 in)
1985	77.9 mm (3.1 in)
1986	81.9 mm (3.2 in)
1987	68.4 mm (2.7 in)
1988	122.2 mm (4.8 in)
1989	54.6 mm (2.1 in)
1990	59.7 mm (2.4 in)
1991	70.4 mm (2.8 in)
1992	89.4 mm (3.5 in)
1993	105.8 mm (4.2 in)
1994	62.0 mm (2.4 in)
1995	69.7 mm (2.7 in)
1996	101.9 mm (4.0 in)
1997	79.3 mm (3.1 in)
1998	45.5 mm (1.8 in)
1999	95.1 mm (3.7 in)
2003	52.9 mm (2.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Guerrero (Smn), 1904 to 2003. The record is 154 days in 1909, marked on the chart; the median year is 69 days.

Longest dry spell (CDD) at Guerrero (Smn) by year
Year	Longest dry spell (CDD)
1904	30 days
1905	30 days
1906	34 days
1907	94 days
1908	69 days
1909	154 days
1910	96 days
1924	53 days
1926	56 days
1927	72 days
1928	60 days
1929	45 days
1930	76 days
1931	27 days
1932	84 days
1933	57 days
1934	55 days
1935	117 days
1936	69 days
1937	126 days
1938	108 days
1939	146 days
1940	59 days
1941	62 days
1942	52 days
1943	138 days
1944	52 days
1945	140 days
1946	152 days
1947	55 days
1948	53 days
1949	82 days
1950	95 days
1951	43 days
1952	76 days
1953	57 days
1954	154 days
1955	55 days
1956	93 days
1957	46 days
1958	33 days
1959	59 days
1960	143 days
1961	57 days
1962	102 days
1963	122 days
1964	79 days
1965	66 days
1966	40 days
1967	136 days
1968	49 days
1969	54 days
1970	71 days
1971	104 days
1972	77 days
1973	103 days
1974	138 days
1975	64 days
1976	69 days
1977	54 days
1978	77 days
1979	59 days
1980	38 days
1981	41 days
1982	108 days
1983	47 days
1984	99 days
1985	35 days
1986	40 days
1987	56 days
1988	77 days
1989	40 days
1990	55 days
1991	101 days
1992	52 days
1993	56 days
1994	70 days
1995	90 days
1996	70 days
1997	30 days
1998	86 days
1999	112 days
2003	99 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

62 years with a frost

Across 62 years with a frost, the median last spring frost at Guerrero (Smn) falls on 1 May and the median first autumn frost on 23 October, which leaves a median of 175 days between them.

In 1960 to 1998 the median growing season was 177 days. That is 8 days more than in 1924 to 1957.

Fitted over all years, the growing season changes by +3.1 days per decade at this station.

Frost dates and growing season at Guerrero (Smn)
Measure	Median, all years	Earliest period (1924 to 1957)	Recent period (1960 to 1998)	Recent against earliest	Fitted trend
Last spring frost	1 May	11 May	26 April	15 days earlier	-2.9 days per decade
First autumn frost	23 October	23 October	20 October	3 days earlier	+0.2 days per decade
Growing days	175 days	169 days	177 days	8 days more	+3.1 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

73 years, 1905 to 2003

A day with at least 40.0 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 83.2 mm (3.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Guerrero (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	40.0 mm (1.6 in)
5 years	51.6 mm (2.0 in)
10 years	59.3 mm (2.3 in)
25 years	69.0 mm (2.7 in)
50 years	76.1 mm (3.0 in)
100 years	83.2 mm (3.3 in)	Longer than the 73 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, 73 years of values from 1905 to 2003.

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: 89.9 mm (3.5 in) in 1966; 75.9 mm (3.0 in) in 1941; 67.8 mm (2.7 in) in 1974.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Guerrero (Smn), at 1981. Each is measured against neighbouring stations.

Relative to 4 neighbouring stations, the station's annual mean temperature from 1981 ran 1.0 C (1.9 F) higher than in the years before (likely change).

Suspected changes in the annual mean temperature at Guerrero (Smn), against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1981	+1.0	+1.9	likely	4

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.

Download the Data

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