San Pedro Potla Weather Records (MXN00015104)

Record envelope, standing records and threshold days for San Pedro Potla (MXN00015104), Mexico, with 40 years of record.

Key Facts for San Pedro Potla

San Pedro Potla (MXN00015104) is a weather station in Mexico at 19.85 latitude and -99.97 longitude, 2,450 m (8,038 ft) above sea level.
The station reports from 1969 to 2008, 40 years of record.
1,464 records set at San Pedro Potla still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
San Pedro Potla set a daily record high maximum temperature of 25.6 C (78.1 F) on 30 December 2008.

About the Station

Location: Mexico, 19.85 latitude, -99.97 longitude.
Elevation: 2,450 m (8,038 ft).
Period of record: 1969 to 2008, 40 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 San Pedro Potla. 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 San Pedro Potla, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	35.0 C (95.0 F)	-8.3 C (17.1 F)	n/a	n/a
Feb	36.7 C (98.1 F)	-9.4 C (15.1 F)	n/a	n/a
Mar	40.0 C (104.0 F)	-8.3 C (17.1 F)	n/a	n/a
Apr	40.0 C (104.0 F)	-5.0 C (23.0 F)	n/a	n/a
May	40.6 C (105.1 F)	-1.1 C (30.0 F)	n/a	n/a
Jun	40.0 C (104.0 F)	0.0 C (32.0 F)	n/a	n/a
Jul	35.6 C (96.1 F)	1.7 C (35.1 F)	n/a	n/a
Aug	29.4 C (84.9 F)	0.6 C (33.1 F)	n/a	n/a
Sep	30.0 C (86.0 F)	0.0 C (32.0 F)	n/a	n/a
Oct	27.8 C (82.0 F)	-8.3 C (17.1 F)	n/a	n/a
Nov	31.7 C (89.1 F)	-7.2 C (19.0 F)	n/a	n/a
Dec	30.6 C (87.1 F)	-9.4 C (15.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Pedro Potla still stand. 2007 holds the most, with 115.

Standing records at San Pedro Potla by the year they were set
Year set	Standing records
1969	13
1970	68
1971	42
1972	53
1973	48
1974	45
1975	32
1976	51
1977	24
1978	36
1979	47
1980	34
1981	37
1982	39
1983	40
1984	23
1985	19
1986	24
1987	39
1988	22
1989	14
1990	19
1991	15
1992	45
1993	24
1994	26
1995	30
1996	23
1997	36
1998	64
1999	48
2000	53
2001	23
2002	28
2003	19
2004	18
2005	19
2006	38
2007	115
2008	71

All-Time Record Progression

2 new records

2 all-time records were set at San Pedro Potla between 27 April 2002 and 4 May 2007. Each dot is a new record.

When San Pedro Potla set new all-time records
Date	Kind	Detail
2002-04-27	Record high maximum temperature	Record high maximum temperature 40.0 C (104.0 F)
2007-05-04	Record high maximum temperature	Record high maximum temperature 40.6 C (105.1 F)

Wettest Day of Each Month

Jun: 68.8 mm (2.7 in)

The wettest day on record for each calendar month at San Pedro Potla. The most was 68.8 mm (2.7 in) on 27 June 1998.

Record daily precipitation for each month at San Pedro Potla
Month	Record daily precipitation (mm)	Date
Jan	43.9 mm (1.7 in)	28 January 1992
Feb	30.0 mm (1.2 in)	27 February 1985
Mar	22.9 mm (0.9 in)	4 March 2000
Apr	23.9 mm (0.9 in)	16 April 1981
May	33.8 mm (1.3 in)	25 May 1971
Jun	68.8 mm (2.7 in)	27 June 1998
Jul	68.8 mm (2.7 in)	29 July 2003
Aug	49.8 mm (2.0 in)	3 August 1988
Sep	48.8 mm (1.9 in)	8 September 1998
Oct	45.5 mm (1.8 in)	7 October 1976
Nov	37.8 mm (1.5 in)	5 November 2002
Dec	36.8 mm (1.4 in)	1 December 1990

Period of Record Coverage

1969 to 2008

40 years of record at San Pedro Potla, 1969 to 2008. 2 years have data for under 90 percent of days and are left out of rankings: 1969, 2007.

Days with data per year at San Pedro Potla
Year	Days with data	Share of year	Complete
1969	49	13%	No
1970	333	91%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	344	94%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	364	100%	Yes
1979	364	100%	Yes
1980	366	100%	Yes
1981	334	92%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	364	100%	Yes
1987	364	100%	Yes
1988	366	100%	Yes
1989	356	98%	Yes
1990	365	100%	Yes
1991	362	99%	Yes
1992	353	96%	Yes
1993	365	100%	Yes
1994	357	98%	Yes
1995	365	100%	Yes
1996	363	99%	Yes
1997	361	99%	Yes
1998	356	98%	Yes
1999	360	99%	Yes
2000	362	99%	Yes
2001	358	98%	Yes
2002	356	98%	Yes
2003	358	98%	Yes
2004	364	99%	Yes
2005	363	99%	Yes
2006	358	98%	Yes
2007	177	48%	No
2008	366	100%	Yes

Latest Records

Latest records at San Pedro Potla
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 December 2008	San Pedro Potla, MX	daily high max	25.6 C (78.1 F)	2.8 C (5.0 F)	36 years	25 of 100 (Routine)
24 December 2008	San Pedro Potla, MX	daily low min (Tie)	-5.0 C (23.0 F)	tie	37 years	3 of 100 (Routine)
15 December 2008	San Pedro Potla, MX	daily high max (Tie)	25.0 C (77.0 F)	tie	14 years	2 of 100 (Routine)
11 December 2008	San Pedro Potla, MX	daily high min (Tie)	5.6 C (42.1 F)	tie	18 years	2 of 100 (Routine)
2 December 2008	San Pedro Potla, MX	daily low max	17.8 C (64.0 F)	1.1 C (2.0 F)	32 years	17 of 100 (Routine)
1 December 2008	San Pedro Potla, MX	daily low max (Tie)	16.7 C (62.1 F)	tie	31 years	3 of 100 (Routine)
26 November 2008	San Pedro Potla, MX	daily low max	15.0 C (59.0 F)	0.6 C (1.1 F)	26 years	13 of 100 (Routine)
24 November 2008	San Pedro Potla, MX	daily low max	15.0 C (59.0 F)	1.7 C (3.1 F)	13 years	14 of 100 (Routine)
16 November 2008	San Pedro Potla, MX	daily low max	15.0 C (59.0 F)	2.2 C (4.0 F)	38 years	24 of 100 (Routine)
13 November 2008	San Pedro Potla, MX	daily low max	12.8 C (55.0 F)	5.0 C (9.0 F)	33 years	33 of 100 (Routine)
2 November 2008	San Pedro Potla, MX	daily low max	15.0 C (59.0 F)	2.8 C (5.0 F)	32 years	24 of 100 (Routine)
28 October 2008	San Pedro Potla, MX	daily low max	13.9 C (57.0 F)	1.1 C (2.0 F)	7 years	10 of 100 (Routine)
21 October 2008	San Pedro Potla, MX	daily low max (Tie)	17.8 C (64.0 F)	tie	35 years	3 of 100 (Routine)
20 October 2008	San Pedro Potla, MX	daily low max	13.9 C (57.0 F)	1.7 C (3.1 F)	19 years	16 of 100 (Routine)
18 October 2008	San Pedro Potla, MX	daily low max	15.0 C (59.0 F)	2.8 C (5.0 F)	30 years	25 of 100 (Routine)
17 October 2008	San Pedro Potla, MX	daily low max	15.6 C (60.1 F)	1.1 C (2.0 F)	30 years	17 of 100 (Routine)
9 October 2008	San Pedro Potla, MX	daily low max (Tie)	16.7 C (62.1 F)	tie	17 years	2 of 100 (Routine)
6 October 2008	San Pedro Potla, MX	daily low max (Tie)	17.8 C (64.0 F)	tie	12 years	1 of 100 (Routine)
3 October 2008	San Pedro Potla, MX	daily low max	15.0 C (59.0 F)	1.7 C (3.1 F)	34 years	21 of 100 (Routine)
1 October 2008	San Pedro Potla, MX	daily low min (Tie)	0.0 C (32.0 F)	tie	13 years	1 of 100 (Routine)

Climate Trend

35 complete years, 1971 to 2008

One stripe for each of 35 complete years at San Pedro Potla, 1971 to 2008. Blue stripes are years cooler than the station's own mean of 13.8 C (56.9 F); red stripes are warmer. The coolest year was 2008, at 11.6 C (52.9 F), and the warmest was 1998, at 15.0 C (59.1 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at San Pedro Potla as warming stripes, 1971 to 2008
Year	Annual mean temperature	Difference from the station mean
1971	13.4 C	-0.46 C
1972	14.2 C	+0.38 C
1973	13.8 C	+0.01 C
1975	13.3 C	-0.52 C
1976	13.2 C	-0.62 C
1977	13.4 C	-0.40 C
1978	13.6 C	-0.20 C
1979	13.7 C	-0.17 C
1980	13.8 C	+0.01 C
1982	13.9 C	+0.08 C
1983	13.6 C	-0.23 C
1984	13.1 C	-0.71 C
1985	13.2 C	-0.64 C
1986	13.4 C	-0.42 C
1987	13.4 C	-0.45 C
1988	14.0 C	+0.16 C
1989	13.6 C	-0.27 C
1990	13.7 C	-0.14 C
1991	13.9 C	+0.02 C
1992	14.0 C	+0.19 C
1993	14.3 C	+0.45 C
1994	14.4 C	+0.56 C
1995	14.8 C	+0.92 C
1996	14.5 C	+0.69 C
1997	14.5 C	+0.66 C
1998	15.0 C	+1.21 C
1999	13.9 C	+0.11 C
2000	14.0 C	+0.17 C
2001	13.9 C	+0.07 C
2002	14.2 C	+0.39 C
2003	14.3 C	+0.49 C
2004	14.1 C	+0.30 C
2005	14.1 C	+0.24 C
2006	14.3 C	+0.45 C
2008	11.6 C	-2.22 C

The fitted trend in annual mean temperature here over 1971 to 2008 is 0.1 C (0.0 to 0.3) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.3 F (-0.1 to 0.6) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at San Pedro Potla
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.1 C (0.0 to 0.3) per decade	0.3 F (-0.1 to 0.6) per decade	1971 to 2008	35	Not clearly different from zero
Mean daily maximum	0.4 C (0.1 to 0.7) per decade	0.8 F (0.2 to 1.3) per decade	1971 to 2008	35	Rise
Mean daily minimum	-0.14 C (-0.31 to 0.02) per decade	-0.26 F (-0.56 to 0.04) per decade	1971 to 2008	35	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

1969 to 2008

Yearly extremes at San Pedro Potla: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.6 C (105.1 F)	2007	30.6 C (87.1 F)	40
Coldest night (TNn)	-9.4 C (15.1 F)	1999	-5.0 C (23.0 F)	40
Wettest day (Rx1day)	68.8 mm (2.7 in)	1998	41.9 mm (1.6 in)	40
Wettest five days (Rx5day)	140.5 mm (5.5 in)	1969	92.2 mm (3.6 in)	40
Longest dry spell (CDD)	115 days	1998	53 days	40

Hottest day (TXx)

The hottest day of the year at San Pedro Potla, 1969 to 2008. The record is 40.6 C (105.1 F) in 2007, marked on the chart; the median year is 30.6 C (87.1 F).

Hottest day (TXx) at San Pedro Potla by year
Year	Hottest day (TXx)
1969	25.6 C (78.1 F)
1970	31.7 C (89.1 F)
1971	31.7 C (89.1 F)
1972	30.0 C (86.0 F)
1973	30.6 C (87.1 F)
1974	28.9 C (84.0 F)
1975	30.0 C (86.0 F)
1976	27.8 C (82.0 F)
1977	30.6 C (87.1 F)
1978	30.6 C (87.1 F)
1979	28.9 C (84.0 F)
1980	28.9 C (84.0 F)
1981	28.9 C (84.0 F)
1982	30.0 C (86.0 F)
1983	32.8 C (91.0 F)
1984	30.0 C (86.0 F)
1985	30.6 C (87.1 F)
1986	30.0 C (86.0 F)
1987	30.0 C (86.0 F)
1988	30.0 C (86.0 F)
1989	30.6 C (87.1 F)
1990	28.9 C (84.0 F)
1991	30.6 C (87.1 F)
1992	30.6 C (87.1 F)
1993	32.8 C (91.0 F)
1994	32.8 C (91.0 F)
1995	33.9 C (93.0 F)
1996	31.7 C (89.1 F)
1997	31.7 C (89.1 F)
1998	35.6 C (96.1 F)
1999	35.0 C (95.0 F)
2000	32.8 C (91.0 F)
2001	33.9 C (93.0 F)
2002	40.0 C (104.0 F)
2003	36.7 C (98.1 F)
2004	30.0 C (86.0 F)
2005	35.0 C (95.0 F)
2006	31.7 C (89.1 F)
2007	40.6 C (105.1 F)
2008	26.7 C (80.1 F)

Coldest night (TNn)

The coldest night of the year at San Pedro Potla, 1969 to 2008. The record is -9.4 C (15.1 F) in 1999, marked on the chart; the median year is -5.0 C (23.0 F).

Coldest night (TNn) at San Pedro Potla by year
Year	Coldest night (TNn)
1969	-7.2 C (19.0 F)
1970	-5.6 C (21.9 F)
1971	-5.0 C (23.0 F)
1972	0.0 C (32.0 F)
1973	-1.1 C (30.0 F)
1974	0.0 C (32.0 F)
1975	0.0 C (32.0 F)
1976	-7.2 C (19.0 F)
1977	-3.3 C (26.1 F)
1978	-3.3 C (26.1 F)
1979	-1.1 C (30.0 F)
1980	0.0 C (32.0 F)
1981	-5.0 C (23.0 F)
1982	-7.2 C (19.0 F)
1983	-7.2 C (19.0 F)
1984	-5.0 C (23.0 F)
1985	-5.0 C (23.0 F)
1986	-8.3 C (17.1 F)
1987	-7.2 C (19.0 F)
1988	-5.0 C (23.0 F)
1989	0.0 C (32.0 F)
1990	0.0 C (32.0 F)
1991	-3.3 C (26.1 F)
1992	0.0 C (32.0 F)
1993	0.0 C (32.0 F)
1994	-2.2 C (28.0 F)
1995	0.0 C (32.0 F)
1996	0.0 C (32.0 F)
1997	-4.4 C (24.1 F)
1998	-8.3 C (17.1 F)
1999	-9.4 C (15.1 F)
2000	-9.4 C (15.1 F)
2001	-4.4 C (24.1 F)
2002	-7.2 C (19.0 F)
2003	-7.2 C (19.0 F)
2004	-5.0 C (23.0 F)
2005	-6.1 C (21.0 F)
2006	-7.2 C (19.0 F)
2007	-4.4 C (24.1 F)
2008	-6.1 C (21.0 F)

Wettest day (Rx1day)

The wettest day of the year at San Pedro Potla, 1969 to 2008. The record is 68.8 mm (2.7 in) in 1998, marked on the chart; the median year is 41.9 mm (1.6 in).

Wettest day (Rx1day) at San Pedro Potla by year
Year	Wettest day (Rx1day)
1969	40.9 mm (1.6 in)
1970	43.9 mm (1.7 in)
1971	46.5 mm (1.8 in)
1972	40.9 mm (1.6 in)
1973	46.0 mm (1.8 in)
1974	45.0 mm (1.8 in)
1975	33.8 mm (1.3 in)
1976	45.5 mm (1.8 in)
1977	34.8 mm (1.4 in)
1978	43.9 mm (1.7 in)
1979	35.3 mm (1.4 in)
1980	34.8 mm (1.4 in)
1981	39.9 mm (1.6 in)
1982	31.0 mm (1.2 in)
1983	47.8 mm (1.9 in)
1984	39.9 mm (1.6 in)
1985	39.9 mm (1.6 in)
1986	24.9 mm (1.0 in)
1987	46.0 mm (1.8 in)
1988	49.8 mm (2.0 in)
1989	39.9 mm (1.6 in)
1990	39.9 mm (1.6 in)
1991	46.0 mm (1.8 in)
1992	45.0 mm (1.8 in)
1993	45.0 mm (1.8 in)
1994	47.8 mm (1.9 in)
1995	39.9 mm (1.6 in)
1996	47.0 mm (1.9 in)
1997	43.9 mm (1.7 in)
1998	68.8 mm (2.7 in)
1999	46.0 mm (1.8 in)
2000	48.8 mm (1.9 in)
2001	39.9 mm (1.6 in)
2002	37.8 mm (1.5 in)
2003	68.8 mm (2.7 in)
2004	37.8 mm (1.5 in)
2005	24.9 mm (1.0 in)
2006	39.9 mm (1.6 in)
2007	25.9 mm (1.0 in)
2008	42.9 mm (1.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Pedro Potla, 1969 to 2008. The record is 140.5 mm (5.5 in) in 1969, marked on the chart; the median year is 92.2 mm (3.6 in).

Wettest five days (Rx5day) at San Pedro Potla by year
Year	Wettest five days (Rx5day)
1969	140.5 mm (5.5 in)
1970	92.0 mm (3.6 in)
1971	98.8 mm (3.9 in)
1972	74.5 mm (2.9 in)
1973	112.0 mm (4.4 in)
1974	100.4 mm (4.0 in)
1975	70.2 mm (2.8 in)
1976	119.4 mm (4.7 in)
1977	98.6 mm (3.9 in)
1978	103.9 mm (4.1 in)
1979	95.5 mm (3.8 in)
1980	94.2 mm (3.7 in)
1981	90.0 mm (3.5 in)
1982	76.5 mm (3.0 in)
1983	92.3 mm (3.6 in)
1984	69.0 mm (2.7 in)
1985	73.9 mm (2.9 in)
1986	70.1 mm (2.8 in)
1987	103.7 mm (4.1 in)
1988	81.6 mm (3.2 in)
1989	73.4 mm (2.9 in)
1990	96.6 mm (3.8 in)
1991	99.3 mm (3.9 in)
1992	97.4 mm (3.8 in)
1993	94.8 mm (3.7 in)
1994	95.2 mm (3.7 in)
1995	83.3 mm (3.3 in)
1996	86.4 mm (3.4 in)
1997	61.2 mm (2.4 in)
1998	136.4 mm (5.4 in)
1999	128.3 mm (5.1 in)
2000	82.6 mm (3.3 in)
2001	91.2 mm (3.6 in)
2002	74.7 mm (2.9 in)
2003	126.5 mm (5.0 in)
2004	81.2 mm (3.2 in)
2005	71.4 mm (2.8 in)
2006	72.1 mm (2.8 in)
2007	52.5 mm (2.1 in)
2008	93.5 mm (3.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Pedro Potla, 1969 to 2008. The record is 115 days in 1998, marked on the chart; the median year is 53 days.

Longest dry spell (CDD) at San Pedro Potla by year
Year	Longest dry spell (CDD)
1969	52 days
1970	40 days
1971	70 days
1972	46 days
1973	94 days
1974	38 days
1975	65 days
1976	36 days
1977	32 days
1978	28 days
1979	39 days
1980	32 days
1981	26 days
1982	78 days
1983	68 days
1984	56 days
1985	31 days
1986	68 days
1987	50 days
1988	37 days
1989	74 days
1990	37 days
1991	89 days
1992	34 days
1993	110 days
1994	59 days
1995	48 days
1996	59 days
1997	54 days
1998	115 days
1999	54 days
2000	63 days
2001	47 days
2002	44 days
2003	86 days
2004	53 days
2005	40 days
2006	53 days
2007	33 days
2008	88 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

35 years with a frost

Across 35 years with a frost, the median last spring frost at San Pedro Potla falls on 10 April and the median first autumn frost on 26 October, which leaves a median of 196 days between them.

Fitted over all years, the growing season changes by -4.0 days per decade at this station.

Frost dates and growing season at San Pedro Potla
Measure	Median, all years	Earliest period	Recent period (1977 to 2008)	Recent against earliest	Fitted trend
Last spring frost	10 April	n/a	10 April	n/a	+2.1 days per decade
First autumn frost	26 October	n/a	25 October	n/a	-1.9 days per decade
Growing days	196 days	n/a	195 days	n/a	-4.0 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

39 years, 1969 to 2008

A day with at least 42.1 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 61.9 mm (2.4 in) of rain is expected about once in 100 years.

Rainfall return levels at San Pedro Potla: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	42.1 mm (1.7 in)
5 years	49.0 mm (1.9 in)
10 years	52.8 mm (2.1 in)
25 years	57.0 mm (2.2 in)
50 years	59.6 mm (2.3 in)	Longer than the 39 years of record
100 years	61.9 mm (2.4 in)	Longer than the 39 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, 39 years of values from 1969 to 2008.

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: 68.8 mm (2.7 in) in 1998; 68.8 mm (2.7 in) in 2003; 49.8 mm (2.0 in) in 1988.

Download the Data

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