Santiago Undameo Weather Records (MXN00016120)

Record envelope, standing records and threshold days for Santiago Undameo (MXN00016120), Mexico, with 55 years of record.

Key Facts for Santiago Undameo

Santiago Undameo (MXN00016120) is a weather station in Mexico at 19.60 latitude and -101.32 longitude, 2,130 m (6,988 ft) above sea level.
The station reports from 1953 to 2007, 55 years of record.
1,464 records set at Santiago Undameo still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Santiago Undameo tied a daily record high minimum temperature of 11.7 C (53.1 F) on 22 October 2007.

About the Station

Location: Mexico, 19.60 latitude, -101.32 longitude.
Elevation: 2,130 m (6,988 ft).
Period of record: 1953 to 2007, 55 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 Santiago Undameo. 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 Santiago Undameo, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	29.4 C (84.9 F)	-6.1 C (21.0 F)	n/a	n/a
Feb	31.7 C (89.1 F)	-7.8 C (18.0 F)	n/a	n/a
Mar	35.0 C (95.0 F)	-3.3 C (26.1 F)	n/a	n/a
Apr	37.2 C (99.0 F)	-1.1 C (30.0 F)	n/a	n/a
May	40.0 C (104.0 F)	1.1 C (34.0 F)	n/a	n/a
Jun	36.1 C (97.0 F)	3.9 C (39.0 F)	n/a	n/a
Jul	30.6 C (87.1 F)	5.6 C (42.1 F)	n/a	n/a
Aug	30.0 C (86.0 F)	5.0 C (41.0 F)	n/a	n/a
Sep	29.4 C (84.9 F)	2.8 C (37.0 F)	n/a	n/a
Oct	29.4 C (84.9 F)	-3.3 C (26.1 F)	n/a	n/a
Nov	29.4 C (84.9 F)	-5.0 C (23.0 F)	n/a	n/a
Dec	28.9 C (84.0 F)	-5.6 C (21.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Santiago Undameo still stand. 1977 holds the most, with 80.

Standing records at Santiago Undameo by the year they were set
Year set	Standing records
1954	9
1955	12
1956	19
1957	29
1958	18
1959	14
1960	11
1961	10
1962	10
1963	19
1964	13
1965	19
1966	26
1967	20
1968	22
1969	35
1970	50
1971	25
1972	18
1973	22
1974	18
1975	28
1976	46
1977	80
1978	68
1979	57
1980	38
1981	40
1982	29
1983	25
1984	10
1985	5
1986	14
1987	23
1988	21
1989	13
1990	18
1991	27
1992	34
1993	29
1994	25
1995	78
1996	26
1997	36
1998	54
1999	34
2000	32
2001	31
2002	19
2003	33
2004	14
2005	45
2006	6
2007	7

All-Time Record Progression

2 new records

2 all-time records were set at Santiago Undameo between 16 May 1995 and 17 May 1995. Each dot is a new record.

When Santiago Undameo set new all-time records
Date	Kind	Detail
1995-05-16	Record high maximum temperature	Record high maximum temperature 37.8 C (100.0 F)
1995-05-17	Record high maximum temperature	Record high maximum temperature 40.0 C (104.0 F)

Wettest Day of Each Month

Oct: 81.8 mm (3.2 in)

The wettest day on record for each calendar month at Santiago Undameo. The most was 81.8 mm (3.2 in) on 8 October 1976.

Record daily precipitation for each month at Santiago Undameo
Month	Record daily precipitation (mm)	Date
Jan	53.8 mm (2.1 in)	25 January 1990
Feb	36.8 mm (1.4 in)	21 February 1977
Mar	42.2 mm (1.7 in)	17 March 1969
Apr	34.8 mm (1.4 in)	30 April 1995
May	51.6 mm (2.0 in)	29 May 1956
Jun	53.1 mm (2.1 in)	26 June 1973
Jul	53.8 mm (2.1 in)	20 July 1999
Aug	60.2 mm (2.4 in)	1 August 1956
Sep	63.8 mm (2.5 in)	25 September 2001
Oct	81.8 mm (3.2 in)	8 October 1976
Nov	30.2 mm (1.2 in)	15 November 1992
Dec	32.3 mm (1.3 in)	2 December 1994

Period of Record Coverage

1953 to 2007

55 years of record at Santiago Undameo, 1953 to 2007. 5 years have data for under 90 percent of days and are left out of rankings: 1953, 2002, 2003, 2006, 2007.

Days with data per year at Santiago Undameo
Year	Days with data	Share of year	Complete
1953	9	2%	No
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	364	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	364	100%	Yes
1966	363	99%	Yes
1967	364	100%	Yes
1968	363	99%	Yes
1969	364	100%	Yes
1970	365	100%	Yes
1971	363	99%	Yes
1972	365	100%	Yes
1973	365	100%	Yes
1974	362	99%	Yes
1975	361	99%	Yes
1976	364	99%	Yes
1977	361	99%	Yes
1978	355	97%	Yes
1979	356	98%	Yes
1980	363	99%	Yes
1981	362	99%	Yes
1982	365	100%	Yes
1983	362	99%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	365	100%	Yes
1991	364	100%	Yes
1992	366	100%	Yes
1993	365	100%	Yes
1994	364	100%	Yes
1995	364	100%	Yes
1996	365	100%	Yes
1997	365	100%	Yes
1998	364	100%	Yes
1999	364	100%	Yes
2000	366	100%	Yes
2001	362	99%	Yes
2002	272	75%	No
2003	207	57%	No
2004	366	100%	Yes
2005	365	100%	Yes
2006	178	49%	No
2007	211	58%	No

Latest Records

Latest records at Santiago Undameo
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
22 October 2007	Santiago Undameo, MX	daily high min (Tie)	11.7 C (53.1 F)	tie	16 years	2 of 100 (Routine)
16 October 2007	Santiago Undameo, MX	daily high min	13.3 C (55.9 F)	0.5 C (0.9 F)	48 years	20 of 100 (Routine)
12 October 2007	Santiago Undameo, MX	daily high max (Tie)	26.7 C (80.1 F)	tie	36 years	4 of 100 (Routine)
3 October 2007	Santiago Undameo, MX	daily rain	31.0 mm (1.2 in)	3.8 mm (0.15 in)	14 years	13 of 100 (Routine)
16 September 2007	Santiago Undameo, MX	daily high max (Tie)	28.3 C (82.9 F)	tie	0 years	1 of 100 (Routine)
14 April 2007	Santiago Undameo, MX	daily low min	0.6 C (33.1 F)	2.2 C (4.0 F)	52 years	29 of 100 (Routine)
12 April 2007	Santiago Undameo, MX	daily low min	1.7 C (35.1 F)	2.2 C (4.0 F)	45 years	27 of 100 (Routine)
11 April 2007	Santiago Undameo, MX	daily low min	1.1 C (34.0 F)	1.1 C (2.0 F)	24 years	16 of 100 (Routine)
14 March 2007	Santiago Undameo, MX	daily low max (Tie)	22.2 C (72.0 F)	tie	37 years	4 of 100 (Routine)
13 March 2007	Santiago Undameo, MX	daily rain	2.8 mm (0.11 in)	1.3 mm (0.05 in)	21 years	12 of 100 (Routine)
12 March 2007	Santiago Undameo, MX	daily rain	0.8 mm (0.03 in)	0.8 mm (0.03 in)	52 years	20 of 100 (Routine)
5 February 2007	Santiago Undameo, MX	daily rain	9.9 mm (0.39 in)	3.0 mm (0.12 in)	17 years	15 of 100 (Routine)
3 February 2007	Santiago Undameo, MX	daily high min	7.2 C (45.0 F)	0.5 C (0.9 F)	15 years	11 of 100 (Routine)
30 January 2007	Santiago Undameo, MX	daily rain	5.1 mm (0.20 in)	2.8 mm (0.11 in)	20 years	13 of 100 (Routine)
27 January 2007	Santiago Undameo, MX	daily rain	7.4 mm (0.29 in)	7.4 mm (0.29 in)	52 years	20 of 100 (Routine)
19 January 2007	Santiago Undameo, MX	daily high max	27.2 C (81.0 F)	0.5 C (0.9 F)	16 years	10 of 100 (Routine)
18 January 2007	Santiago Undameo, MX	daily high max	27.2 C (81.0 F)	1.1 C (2.0 F)	13 years	12 of 100 (Routine)
15 January 2007	Santiago Undameo, MX	daily high max (Tie)	27.2 C (81.0 F)	tie	11 years	2 of 100 (Routine)
8 January 2007	Santiago Undameo, MX	daily high max (Tie)	26.7 C (80.1 F)	tie	3 years	1 of 100 (Routine)
7 January 2007	Santiago Undameo, MX	daily high max (Tie)	26.7 C (80.1 F)	tie	49 years	4 of 100 (Routine)

Climate Trend

50 complete years, 1954 to 2005

One stripe for each of 50 complete years at Santiago Undameo, 1954 to 2005. Blue stripes are years cooler than the station's own mean of 16.0 C (60.8 F); red stripes are warmer. The coolest year was 1977, at 13.4 C (56.0 F), and the warmest was 1998, at 17.6 C (63.7 F). The strongest colour marks a difference of 2.7 C (4.9 F).

Annual mean temperature at Santiago Undameo as warming stripes, 1954 to 2005
Year	Annual mean temperature	Difference from the station mean
1954	15.7 C	-0.25 C
1955	15.6 C	-0.36 C
1956	15.1 C	-0.86 C
1957	15.4 C	-0.58 C
1958	15.4 C	-0.59 C
1959	15.1 C	-0.85 C
1960	15.2 C	-0.74 C
1961	15.2 C	-0.82 C
1962	15.4 C	-0.57 C
1963	15.4 C	-0.57 C
1964	15.4 C	-0.62 C
1965	15.6 C	-0.39 C
1966	15.7 C	-0.23 C
1967	15.8 C	-0.19 C
1968	15.6 C	-0.33 C
1969	16.4 C	+0.46 C
1970	17.3 C	+1.32 C
1971	16.7 C	+0.76 C
1972	16.3 C	+0.35 C
1973	15.8 C	-0.18 C
1974	15.4 C	-0.59 C
1975	14.8 C	-1.13 C
1976	14.1 C	-1.89 C
1977	13.4 C	-2.61 C
1978	13.8 C	-2.22 C
1979	14.5 C	-1.44 C
1980	16.4 C	+0.43 C
1981	16.4 C	+0.42 C
1982	17.1 C	+1.16 C
1983	16.3 C	+0.31 C
1984	15.9 C	-0.10 C
1985	16.1 C	+0.09 C
1986	16.1 C	+0.13 C
1987	16.9 C	+0.94 C
1988	16.5 C	+0.48 C
1989	16.4 C	+0.47 C
1990	16.7 C	+0.77 C
1991	17.0 C	+1.05 C
1992	16.3 C	+0.35 C
1993	16.9 C	+0.91 C
1994	17.3 C	+1.34 C
1995	16.3 C	+0.30 C
1996	16.6 C	+0.66 C
1997	16.9 C	+0.90 C
1998	17.6 C	+1.64 C
1999	16.5 C	+0.54 C
2000	16.6 C	+0.67 C
2001	16.5 C	+0.50 C
2004	15.9 C	-0.06 C
2005	17.4 C	+1.40 C

The annual mean temperature here has risen by 0.3 C (0.2 to 0.5) per decade over 1954 to 2005. In Fahrenheit: 0.6 F (0.3 to 0.9) per decade. The slope is a straight line fitted to 50 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Santiago Undameo
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.3 C (0.2 to 0.5) per decade	0.6 F (0.3 to 0.9) per decade	1954 to 2005	50	Rise
Mean daily maximum	0.7 C (0.4 to 1.0) per decade	1.3 F (0.8 to 1.7) per decade	1954 to 2005	50	Rise
Mean daily minimum	-0.03 C (-0.16 to 0.11) per decade	-0.05 F (-0.30 to 0.20) per decade	1954 to 2005	50	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

1953 to 2007

Yearly extremes at Santiago Undameo: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.0 C (104.0 F)	1995	32.8 C (91.0 F)	55
Coldest night (TNn)	-7.8 C (18.0 F)	1976	-3.3 C (26.1 F)	55
Wettest day (Rx1day)	81.8 mm (3.2 in)	1976	42.2 mm (1.7 in)	55
Wettest five days (Rx5day)	192.4 mm (7.6 in)	1972	81.3 mm (3.2 in)	55
Longest dry spell (CDD)	181 days	1983	52 days	55

Hottest day (TXx)

The hottest day of the year at Santiago Undameo, 1953 to 2007. The record is 40.0 C (104.0 F) in 1995, marked on the chart; the median year is 32.8 C (91.0 F).

Hottest day (TXx) at Santiago Undameo by year
Year	Hottest day (TXx)
1953	23.9 C (75.0 F)
1954	31.7 C (89.1 F)
1955	31.1 C (88.0 F)
1956	30.6 C (87.1 F)
1957	30.0 C (86.0 F)
1958	30.0 C (86.0 F)
1959	27.8 C (82.0 F)
1960	30.0 C (86.0 F)
1961	32.8 C (91.0 F)
1962	30.6 C (87.1 F)
1963	31.7 C (89.1 F)
1964	31.7 C (89.1 F)
1965	31.7 C (89.1 F)
1966	30.6 C (87.1 F)
1967	32.2 C (90.0 F)
1968	30.6 C (87.1 F)
1969	32.2 C (90.0 F)
1970	36.1 C (97.0 F)
1971	36.7 C (98.1 F)
1972	32.8 C (91.0 F)
1973	32.2 C (90.0 F)
1974	32.8 C (91.0 F)
1975	31.7 C (89.1 F)
1976	30.0 C (86.0 F)
1977	29.4 C (84.9 F)
1978	31.1 C (88.0 F)
1979	30.6 C (87.1 F)
1980	31.7 C (89.1 F)
1981	32.2 C (90.0 F)
1982	33.9 C (93.0 F)
1983	36.1 C (97.0 F)
1984	32.8 C (91.0 F)
1985	33.3 C (91.9 F)
1986	33.3 C (91.9 F)
1987	34.4 C (93.9 F)
1988	34.4 C (93.9 F)
1989	34.4 C (93.9 F)
1990	32.8 C (91.0 F)
1991	36.1 C (97.0 F)
1992	31.7 C (89.1 F)
1993	34.4 C (93.9 F)
1994	34.4 C (93.9 F)
1995	40.0 C (104.0 F)
1996	34.4 C (93.9 F)
1997	33.3 C (91.9 F)
1998	38.3 C (100.9 F)
1999	35.0 C (95.0 F)
2000	35.0 C (95.0 F)
2001	34.4 C (93.9 F)
2002	35.0 C (95.0 F)
2003	40.0 C (104.0 F)
2004	31.1 C (88.0 F)
2005	36.1 C (97.0 F)
2006	33.3 C (91.9 F)
2007	32.2 C (90.0 F)

Coldest night (TNn)

The coldest night of the year at Santiago Undameo, 1953 to 2007. The record is -7.8 C (18.0 F) in 1976, marked on the chart; the median year is -3.3 C (26.1 F).

Coldest night (TNn) at Santiago Undameo by year
Year	Coldest night (TNn)
1953	-0.6 C (30.9 F)
1954	-5.0 C (23.0 F)
1955	-6.1 C (21.0 F)
1956	-6.1 C (21.0 F)
1957	-5.0 C (23.0 F)
1958	-3.3 C (26.1 F)
1959	-2.8 C (27.0 F)
1960	-3.9 C (25.0 F)
1961	-5.0 C (23.0 F)
1962	-3.3 C (26.1 F)
1963	-5.0 C (23.0 F)
1964	0.0 C (32.0 F)
1965	-4.4 C (24.1 F)
1966	-5.0 C (23.0 F)
1967	-3.9 C (25.0 F)
1968	-3.3 C (26.1 F)
1969	-2.2 C (28.0 F)
1970	-2.8 C (27.0 F)
1971	0.0 C (32.0 F)
1972	-3.3 C (26.1 F)
1973	-3.3 C (26.1 F)
1974	-2.2 C (28.0 F)
1975	-5.6 C (21.9 F)
1976	-7.8 C (18.0 F)
1977	-3.3 C (26.1 F)
1978	-2.2 C (28.0 F)
1979	-1.1 C (30.0 F)
1980	-2.8 C (27.0 F)
1981	-3.3 C (26.1 F)
1982	-2.2 C (28.0 F)
1983	-3.9 C (25.0 F)
1984	-1.7 C (28.9 F)
1985	-3.3 C (26.1 F)
1986	-2.2 C (28.0 F)
1987	0.0 C (32.0 F)
1988	-4.4 C (24.1 F)
1989	-0.6 C (30.9 F)
1990	-1.1 C (30.0 F)
1991	-1.7 C (28.9 F)
1992	-3.3 C (26.1 F)
1993	-1.7 C (28.9 F)
1994	-1.1 C (30.0 F)
1995	-2.8 C (27.0 F)
1996	-6.1 C (21.0 F)
1997	-1.1 C (30.0 F)
1998	-4.4 C (24.1 F)
1999	-6.1 C (21.0 F)
2000	-3.3 C (26.1 F)
2001	-3.3 C (26.1 F)
2002	-4.4 C (24.1 F)
2003	-5.0 C (23.0 F)
2004	-4.4 C (24.1 F)
2005	-3.3 C (26.1 F)
2006	-5.6 C (21.9 F)
2007	-1.1 C (30.0 F)

Wettest day (Rx1day)

The wettest day of the year at Santiago Undameo, 1953 to 2007. The record is 81.8 mm (3.2 in) in 1976, marked on the chart; the median year is 42.2 mm (1.7 in).

Wettest day (Rx1day) at Santiago Undameo by year
Year	Wettest day (Rx1day)
1953	0.0 mm (0.00 in)
1954	37.3 mm (1.5 in)
1955	42.9 mm (1.7 in)
1956	60.2 mm (2.4 in)
1957	36.3 mm (1.4 in)
1958	51.8 mm (2.0 in)
1959	41.4 mm (1.6 in)
1960	32.0 mm (1.3 in)
1961	45.2 mm (1.8 in)
1962	40.1 mm (1.6 in)
1963	38.6 mm (1.5 in)
1964	36.1 mm (1.4 in)
1965	38.6 mm (1.5 in)
1966	40.6 mm (1.6 in)
1967	51.8 mm (2.0 in)
1968	50.3 mm (2.0 in)
1969	42.2 mm (1.7 in)
1970	24.9 mm (1.0 in)
1971	25.4 mm (1.0 in)
1972	51.6 mm (2.0 in)
1973	55.9 mm (2.2 in)
1974	35.1 mm (1.4 in)
1975	48.3 mm (1.9 in)
1976	81.8 mm (3.2 in)
1977	43.4 mm (1.7 in)
1978	39.4 mm (1.6 in)
1979	50.3 mm (2.0 in)
1980	41.7 mm (1.6 in)
1981	58.9 mm (2.3 in)
1982	39.6 mm (1.6 in)
1983	33.8 mm (1.3 in)
1984	37.1 mm (1.5 in)
1985	49.0 mm (1.9 in)
1986	37.6 mm (1.5 in)
1987	39.1 mm (1.5 in)
1988	50.3 mm (2.0 in)
1989	31.8 mm (1.3 in)
1990	53.8 mm (2.1 in)
1991	46.0 mm (1.8 in)
1992	43.4 mm (1.7 in)
1993	36.1 mm (1.4 in)
1994	35.6 mm (1.4 in)
1995	45.7 mm (1.8 in)
1996	51.8 mm (2.0 in)
1997	39.9 mm (1.6 in)
1998	50.5 mm (2.0 in)
1999	53.8 mm (2.1 in)
2000	48.3 mm (1.9 in)
2001	63.8 mm (2.5 in)
2002	39.9 mm (1.6 in)
2003	55.6 mm (2.2 in)
2004	43.4 mm (1.7 in)
2005	53.6 mm (2.1 in)
2006	15.7 mm (0.6 in)
2007	31.0 mm (1.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Santiago Undameo, 1953 to 2007. The record is 192.4 mm (7.6 in) in 1972, marked on the chart; the median year is 81.3 mm (3.2 in).

Wettest five days (Rx5day) at Santiago Undameo by year
Year	Wettest five days (Rx5day)
1953	0.0 mm (0.00 in)
1954	73.1 mm (2.9 in)
1955	86.1 mm (3.4 in)
1956	98.8 mm (3.9 in)
1957	51.3 mm (2.0 in)
1958	91.1 mm (3.6 in)
1959	86.4 mm (3.4 in)
1960	60.0 mm (2.4 in)
1961	89.6 mm (3.5 in)
1962	91.2 mm (3.6 in)
1963	78.8 mm (3.1 in)
1964	81.3 mm (3.2 in)
1965	58.4 mm (2.3 in)
1966	76.8 mm (3.0 in)
1967	127.5 mm (5.0 in)
1968	89.8 mm (3.5 in)
1969	94.0 mm (3.7 in)
1970	59.2 mm (2.3 in)
1971	56.7 mm (2.2 in)
1972	192.4 mm (7.6 in)
1973	93.8 mm (3.7 in)
1974	80.6 mm (3.2 in)
1975	144.8 mm (5.7 in)
1976	156.3 mm (6.2 in)
1977	97.4 mm (3.8 in)
1978	65.4 mm (2.6 in)
1979	75.5 mm (3.0 in)
1980	87.2 mm (3.4 in)
1981	90.4 mm (3.6 in)
1982	70.6 mm (2.8 in)
1983	108.9 mm (4.3 in)
1984	65.3 mm (2.6 in)
1985	79.8 mm (3.1 in)
1986	67.9 mm (2.7 in)
1987	60.0 mm (2.4 in)
1988	122.1 mm (4.8 in)
1989	64.3 mm (2.5 in)
1990	86.9 mm (3.4 in)
1991	70.2 mm (2.8 in)
1992	70.3 mm (2.8 in)
1993	94.7 mm (3.7 in)
1994	74.7 mm (2.9 in)
1995	83.2 mm (3.3 in)
1996	77.1 mm (3.0 in)
1997	66.4 mm (2.6 in)
1998	75.4 mm (3.0 in)
1999	93.8 mm (3.7 in)
2000	90.2 mm (3.6 in)
2001	85.3 mm (3.4 in)
2002	92.0 mm (3.6 in)
2003	85.1 mm (3.4 in)
2004	67.4 mm (2.7 in)
2005	110.2 mm (4.3 in)
2006	21.5 mm (0.8 in)
2007	34.3 mm (1.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Santiago Undameo, 1953 to 2007. The record is 181 days in 1983, marked on the chart; the median year is 52 days.

Longest dry spell (CDD) at Santiago Undameo by year
Year	Longest dry spell (CDD)
1953	10 days
1954	47 days
1955	90 days
1956	76 days
1957	67 days
1958	80 days
1959	48 days
1960	100 days
1961	49 days
1962	102 days
1963	40 days
1964	66 days
1965	50 days
1966	27 days
1967	36 days
1968	32 days
1969	75 days
1970	69 days
1971	75 days
1972	36 days
1973	38 days
1974	42 days
1975	95 days
1976	74 days
1977	43 days
1978	43 days
1979	39 days
1980	59 days
1981	74 days
1982	52 days
1983	181 days
1984	88 days
1985	43 days
1986	33 days
1987	46 days
1988	96 days
1989	57 days
1990	27 days
1991	126 days
1992	51 days
1993	49 days
1994	49 days
1995	38 days
1996	107 days
1997	66 days
1998	129 days
1999	78 days
2000	72 days
2001	78 days
2002	107 days
2003	46 days
2004	48 days
2005	41 days
2006	58 days
2007	32 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

42 years with a frost

Across 42 years with a frost, the median last spring frost at Santiago Undameo falls on 25 February and the median first autumn frost on 20 November, which leaves a median of 272 days between them.

Fitted over all years, the growing season changes by -5.9 days per decade at this station.

Frost dates and growing season at Santiago Undameo
Measure	Median, all years	Earliest period	Recent period (1967 to 2004)	Recent against earliest	Fitted trend
Last spring frost	25 February	n/a	25 February	n/a	+2.0 days per decade
First autumn frost	20 November	n/a	19 November	n/a	-3.9 days per decade
Growing days	272 days	n/a	273 days	n/a	-5.9 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

49 years, 1954 to 2005

A day with at least 43.5 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 73.7 mm (2.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Santiago Undameo: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	43.5 mm (1.7 in)
5 years	52.1 mm (2.1 in)
10 years	57.6 mm (2.3 in)
25 years	64.3 mm (2.5 in)
50 years	69.1 mm (2.7 in)	Longer than the 49 years of record
100 years	73.7 mm (2.9 in)	Longer than the 49 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, 49 years of values from 1954 to 2005.

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: 81.8 mm (3.2 in) in 1976; 63.8 mm (2.5 in) in 2001; 60.2 mm (2.4 in) in 1956.

Station Changes

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

Download the Data

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