KM. 91 + 600 Palo Alto Weather Records (MXN00026306)

Record envelope, standing records and threshold days for KM. 91 + 600 Palo Alto (MXN00026306), Mexico, with 30 years of record.

Key Facts for KM. 91 + 600 Palo Alto

KM. 91 + 600 Palo Alto (MXN00026306) is a weather station in Mexico at 27.28 latitude and -109.35 longitude, 84 m (275 ft) above sea level.
The station reports from 1982 to 2011, 30 years of record.
1,464 records set at KM. 91 + 600 Palo Alto still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 27.28 latitude, -109.35 longitude.
Elevation: 84 m (275 ft).
Period of record: 1982 to 2011, 30 years.
Eligible elements: none yet.

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 KM. 91 + 600 Palo Alto. 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 KM. 91 + 600 Palo Alto, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	35.6 C (96.1 F)	-2.2 C (28.0 F)	n/a	n/a
Feb	37.8 C (100.0 F)	-1.1 C (30.0 F)	n/a	n/a
Mar	40.0 C (104.0 F)	3.3 C (37.9 F)	n/a	n/a
Apr	42.2 C (108.0 F)	5.0 C (41.0 F)	n/a	n/a
May	44.4 C (111.9 F)	6.7 C (44.1 F)	n/a	n/a
Jun	46.1 C (115.0 F)	11.7 C (53.1 F)	n/a	n/a
Jul	48.3 C (118.9 F)	15.6 C (60.1 F)	n/a	n/a
Aug	45.6 C (114.1 F)	15.6 C (60.1 F)	n/a	n/a
Sep	45.0 C (113.0 F)	15.6 C (60.1 F)	n/a	n/a
Oct	41.7 C (107.1 F)	7.8 C (46.0 F)	n/a	n/a
Nov	38.9 C (102.0 F)	2.2 C (36.0 F)	n/a	n/a
Dec	33.9 C (93.0 F)	-1.1 C (30.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at KM. 91 + 600 Palo Alto still stand. 1998 holds the most, with 104.

Standing records at KM. 91 + 600 Palo Alto by the year they were set
Year set	Standing records
1982	61
1983	92
1984	71
1985	68
1986	93
1992	32
1993	47
1994	68
1995	92
1996	35
1997	64
1998	104
1999	104
2000	102
2001	61
2002	29
2003	32
2004	50
2005	25
2006	31
2007	43
2008	45
2009	49
2010	35
2011	31

Wettest Day of Each Month

Sep: 164.8 mm (6.5 in)

The wettest day on record for each calendar month at KM. 91 + 600 Palo Alto. The most was 164.8 mm (6.5 in) on 30 September 2001.

Record daily precipitation for each month at KM. 91 + 600 Palo Alto
Month	Record daily precipitation (mm)	Date
Jan	41.4 mm (1.6 in)	5 January 1992
Feb	50.8 mm (2.0 in)	11 February 2005
Mar	21.8 mm (0.9 in)	2 March 1983
Apr	17.3 mm (0.7 in)	24 April 1997
May	2.0 mm (0.08 in)	3 May 1982
Jun	51.8 mm (2.0 in)	27 June 2009
Jul	80.8 mm (3.2 in)	29 July 2007
Aug	99.8 mm (3.9 in)	23 August 2009
Sep	164.8 mm (6.5 in)	30 September 2001
Oct	74.9 mm (2.9 in)	1 October 1998
Nov	55.9 mm (2.2 in)	13 November 2011
Dec	70.9 mm (2.8 in)	8 December 1982

Period of Record Coverage

1982 to 2011

25 years of record at KM. 91 + 600 Palo Alto, 1982 to 2011. 3 years have data for under 90 percent of days and are left out of rankings: 1986, 1992, 2005.

Days with data per year at KM. 91 + 600 Palo Alto
Year	Days with data	Share of year	Complete
1982	365	100%	Yes
1983	365	100%	Yes
1984	365	100%	Yes
1985	365	100%	Yes
1986	243	67%	No
1992	212	58%	No
1993	334	92%	Yes
1994	365	100%	Yes
1995	360	99%	Yes
1996	364	99%	Yes
1997	364	100%	Yes
1998	362	99%	Yes
1999	362	99%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	363	99%	Yes
2003	365	100%	Yes
2004	365	100%	Yes
2005	328	90%	No
2006	365	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	365	100%	Yes
2010	363	99%	Yes
2011	365	100%	Yes

Latest Records

No records were set at this station in the latest data.

Climate Trend

21 complete years, 1982 to 2011

One stripe for each of 21 complete years at KM. 91 + 600 Palo Alto, 1982 to 2011. Blue stripes are years cooler than the station's own mean of 23.8 C (74.8 F); red stripes are warmer. The coolest year was 2010, at 22.8 C (73.1 F), and the warmest was 1982, at 24.6 C (76.4 F). The strongest colour marks a difference of 1.0 C (1.8 F).

Annual mean temperature at KM. 91 + 600 Palo Alto as warming stripes, 1982 to 2011
Year	Annual mean temperature	Difference from the station mean
1982	24.6 C	+0.84 C
1983	24.5 C	+0.71 C
1984	24.5 C	+0.74 C
1985	24.2 C	+0.42 C
1994	24.5 C	+0.71 C
1995	23.2 C	-0.62 C
1996	23.8 C	-0.04 C
1997	23.8 C	+0.04 C
1998	24.0 C	+0.15 C
1999	24.0 C	+0.22 C
2000	24.1 C	+0.26 C
2001	24.2 C	+0.35 C
2002	23.9 C	+0.14 C
2003	24.2 C	+0.40 C
2004	23.6 C	-0.20 C
2006	24.1 C	+0.26 C
2007	22.9 C	-0.92 C
2008	23.0 C	-0.82 C
2009	23.1 C	-0.75 C
2010	22.8 C	-0.99 C
2011	22.8 C	-0.98 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1982 to 2011

Yearly extremes at KM. 91 + 600 Palo Alto: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	48.3 C (118.9 F)	1998	43.9 C (111.0 F)	25
Coldest night (TNn)	-2.2 C (28.0 F)	1998	2.2 C (36.0 F)	25
Wettest day (Rx1day)	164.8 mm (6.5 in)	2001	54.9 mm (2.2 in)	25
Wettest five days (Rx5day)	268.6 mm (10.6 in)	2001	76.8 mm (3.0 in)	25
Longest dry spell (CDD)	184 days	2011	144 days	25

Hottest day (TXx)

The hottest day of the year at KM. 91 + 600 Palo Alto, 1982 to 2011. The record is 48.3 C (118.9 F) in 1998, marked on the chart; the median year is 43.9 C (111.0 F).

Hottest day (TXx) at KM. 91 + 600 Palo Alto by year
Year	Hottest day (TXx)
1982	42.8 C (109.0 F)
1983	44.4 C (111.9 F)
1984	43.9 C (111.0 F)
1985	44.4 C (111.9 F)
1986	44.4 C (111.9 F)
1992	41.1 C (106.0 F)
1993	43.3 C (109.9 F)
1994	43.3 C (109.9 F)
1995	40.6 C (105.1 F)
1996	45.0 C (113.0 F)
1997	44.4 C (111.9 F)
1998	48.3 C (118.9 F)
1999	45.6 C (114.1 F)
2000	43.9 C (111.0 F)
2001	45.0 C (113.0 F)
2002	43.9 C (111.0 F)
2003	43.9 C (111.0 F)
2004	43.9 C (111.0 F)
2005	41.7 C (107.1 F)
2006	42.8 C (109.0 F)
2007	43.9 C (111.0 F)
2008	40.6 C (105.1 F)
2009	42.8 C (109.0 F)
2010	41.7 C (107.1 F)
2011	40.6 C (105.1 F)

Coldest night (TNn)

The coldest night of the year at KM. 91 + 600 Palo Alto, 1982 to 2011. The record is -2.2 C (28.0 F) in 1998, marked on the chart; the median year is 2.2 C (36.0 F).

Coldest night (TNn) at KM. 91 + 600 Palo Alto by year
Year	Coldest night (TNn)
1982	3.3 C (37.9 F)
1983	2.2 C (36.0 F)
1984	2.8 C (37.0 F)
1985	0.0 C (32.0 F)
1986	5.0 C (41.0 F)
1992	1.7 C (35.1 F)
1993	3.9 C (39.0 F)
1994	2.8 C (37.0 F)
1995	3.3 C (37.9 F)
1996	1.7 C (35.1 F)
1997	-1.1 C (30.0 F)
1998	-2.2 C (28.0 F)
1999	2.2 C (36.0 F)
2000	0.6 C (33.1 F)
2001	0.6 C (33.1 F)
2002	0.6 C (33.1 F)
2003	0.0 C (32.0 F)
2004	2.8 C (37.0 F)
2005	3.9 C (39.0 F)
2006	2.8 C (37.0 F)
2007	1.7 C (35.1 F)
2008	2.8 C (37.0 F)
2009	2.8 C (37.0 F)
2010	5.0 C (41.0 F)
2011	-1.1 C (30.0 F)

Wettest day (Rx1day)

The wettest day of the year at KM. 91 + 600 Palo Alto, 1982 to 2011. The record is 164.8 mm (6.5 in) in 2001, marked on the chart; the median year is 54.9 mm (2.2 in).

Wettest day (Rx1day) at KM. 91 + 600 Palo Alto by year
Year	Wettest day (Rx1day)
1982	70.9 mm (2.8 in)
1983	158.0 mm (6.2 in)
1984	73.4 mm (2.9 in)
1985	39.6 mm (1.6 in)
1986	33.3 mm (1.3 in)
1992	41.4 mm (1.6 in)
1993	47.5 mm (1.9 in)
1994	105.4 mm (4.1 in)
1995	54.9 mm (2.2 in)
1996	53.8 mm (2.1 in)
1997	48.3 mm (1.9 in)
1998	74.9 mm (2.9 in)
1999	47.0 mm (1.9 in)
2000	41.4 mm (1.6 in)
2001	164.8 mm (6.5 in)
2002	36.8 mm (1.4 in)
2003	98.8 mm (3.9 in)
2004	149.9 mm (5.9 in)
2005	50.8 mm (2.0 in)
2006	30.0 mm (1.2 in)
2007	80.8 mm (3.2 in)
2008	56.4 mm (2.2 in)
2009	99.8 mm (3.9 in)
2010	26.9 mm (1.1 in)
2011	79.8 mm (3.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at KM. 91 + 600 Palo Alto, 1982 to 2011. The record is 268.6 mm (10.6 in) in 2001, marked on the chart; the median year is 76.8 mm (3.0 in).

Wettest five days (Rx5day) at KM. 91 + 600 Palo Alto by year
Year	Wettest five days (Rx5day)
1982	103.7 mm (4.1 in)
1983	158.0 mm (6.2 in)
1984	124.8 mm (4.9 in)
1985	54.4 mm (2.1 in)
1986	35.1 mm (1.4 in)
1992	72.9 mm (2.9 in)
1993	68.6 mm (2.7 in)
1994	105.4 mm (4.1 in)
1995	76.8 mm (3.0 in)
1996	53.8 mm (2.1 in)
1997	52.9 mm (2.1 in)
1998	86.6 mm (3.4 in)
1999	48.8 mm (1.9 in)
2000	46.0 mm (1.8 in)
2001	268.6 mm (10.6 in)
2002	40.6 mm (1.6 in)
2003	118.9 mm (4.7 in)
2004	189.5 mm (7.5 in)
2005	52.8 mm (2.1 in)
2006	39.9 mm (1.6 in)
2007	107.0 mm (4.2 in)
2008	105.9 mm (4.2 in)
2009	129.5 mm (5.1 in)
2010	46.5 mm (1.8 in)
2011	100.2 mm (3.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at KM. 91 + 600 Palo Alto, 1982 to 2011. The record is 184 days in 2011, marked on the chart; the median year is 144 days.

Longest dry spell (CDD) at KM. 91 + 600 Palo Alto by year
Year	Longest dry spell (CDD)
1982	81 days
1983	90 days
1984	144 days
1985	70 days
1986	148 days
1992	39 days
1993	152 days
1994	168 days
1995	156 days
1996	182 days
1997	50 days
1998	159 days
1999	84 days
2000	107 days
2001	111 days
2002	153 days
2003	104 days
2004	80 days
2005	118 days
2006	93 days
2007	146 days
2008	156 days
2009	173 days
2010	154 days
2011	184 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.

Download the Data

Data for KM. 91 + 600 Palo Alto standing records by year: CSV or JSON. Field meanings are on the data page.
Data for KM. 91 + 600 Palo Alto 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).