Montebello Weather Records (USC00045790)

Record envelope, standing records and threshold days for Montebello (USC00045790), California, United States, with 33 years of record.

Key Facts for Montebello

Montebello (USC00045790) is a weather station in California, United States at 34.02 latitude and -118.11 longitude, 75 m (246 ft) above sea level.
The station reports from 1979 to 2011, 33 years of record.
1,464 records set at Montebello still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Montebello set a daily record precipitation of 50.8 mm (2.0 in) on 7 March 2010.

About the Station

Location: California, United States, 34.02 latitude, -118.11 longitude.
Elevation: 75 m (246 ft).
Period of record: 1979 to 2011, 33 years.
Eligible elements: prcp, snow, snwd.

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 Montebello. 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 Montebello, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	36.7 C (98.1 F)	-7.2 C (19.0 F)	n/a	n/a
Feb	35.0 C (95.0 F)	-2.2 C (28.0 F)	n/a	n/a
Mar	37.8 C (100.0 F)	0.6 C (33.1 F)	n/a	n/a
Apr	40.0 C (104.0 F)	3.9 C (39.0 F)	n/a	n/a
May	40.6 C (105.1 F)	6.7 C (44.1 F)	n/a	n/a
Jun	42.2 C (108.0 F)	7.8 C (46.0 F)	n/a	n/a
Jul	42.2 C (108.0 F)	8.9 C (48.0 F)	n/a	n/a
Aug	41.1 C (106.0 F)	9.4 C (48.9 F)	n/a	n/a
Sep	45.0 C (113.0 F)	10.0 C (50.0 F)	n/a	n/a
Oct	41.1 C (106.0 F)	5.6 C (42.1 F)	n/a	n/a
Nov	37.8 C (100.0 F)	1.1 C (34.0 F)	n/a	n/a
Dec	31.1 C (88.0 F)	-1.1 C (30.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Montebello still stand. 1983 holds the most, with 87.

Standing records at Montebello by the year they were set
Year set	Standing records
1979	64
1980	58
1981	53
1982	69
1983	87
1984	58
1985	74
1986	63
1987	64
1988	59
1989	86
1990	65
1991	38
1992	35
1993	22
1994	44
1995	37
1996	42
1997	58
1998	32
1999	45
2000	27
2001	29
2002	25
2003	27
2004	29
2005	25
2006	27
2007	26
2008	8
2009	34
2010	43
2011	11

All-Time Record Progression

1 new records

1 all-time records were set at Montebello between 21 January 2010 and 21 January 2010. Each dot is a new record.

Wettest Day of Each Month

Jan: 177.8 mm (7.0 in)

The wettest day on record for each calendar month at Montebello. The most was 177.8 mm (7.0 in) on 21 January 2010.

Record daily precipitation for each month at Montebello
Month	Record daily precipitation (mm)	Date
Jan	177.8 mm (7.0 in)	21 January 2010
Feb	160.0 mm (6.3 in)	18 February 2005
Mar	127.0 mm (5.0 in)	16 March 2003
Apr	50.8 mm (2.0 in)	14 April 2003
May	40.6 mm (1.6 in)	12 May 1998
Jun	20.3 mm (0.8 in)	5 June 1993
Jul	3.8 mm (0.15 in)	12 July 1992
Aug	7.9 mm (0.31 in)	15 August 1984
Sep	63.5 mm (2.5 in)	20 September 2005
Oct	38.1 mm (1.5 in)	30 October 1996
Nov	59.4 mm (2.3 in)	30 November 1982
Dec	122.4 mm (4.8 in)	7 December 1992

Period of Record Coverage

1979 to 2011

33 years of record at Montebello, 1979 to 2011. 22 years have data for under 90 percent of days and are left out of rankings: 1984, 1988, 1991, 1992, 1994, 1995, 1996, 1997 and others.

Days with data per year at Montebello
Year	Days with data	Share of year	Complete
1979	352	96%	Yes
1980	356	97%	Yes
1981	355	97%	Yes
1982	338	93%	Yes
1983	340	93%	Yes
1984	312	85%	No
1985	352	96%	Yes
1986	345	95%	Yes
1987	338	93%	Yes
1988	313	86%	No
1989	345	95%	Yes
1990	339	93%	Yes
1991	280	77%	No
1992	306	84%	No
1993	330	90%	Yes
1994	309	85%	No
1995	301	82%	No
1996	306	84%	No
1997	305	84%	No
1998	303	83%	No
1999	309	85%	No
2000	260	71%	No
2001	221	61%	No
2002	192	53%	No
2003	206	56%	No
2004	232	63%	No
2005	209	57%	No
2006	144	39%	No
2007	115	32%	No
2008	24	7%	No
2009	167	46%	No
2010	213	58%	No
2011	25	7%	No

Latest Records

Latest records at Montebello
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
7 March 2010	Montebello, US	daily rain	50.8 mm (2.0 in)	48.8 mm (1.9 in)	16 years	31 of 100 (Routine)
26 January 2010	Montebello, US	daily rain	88.9 mm (3.5 in)	46.2 mm (1.8 in)	12 years	29 of 100 (Routine)
21 January 2010	Montebello, US	all-time rain	177.8 mm (7.0 in)	17.8 mm (0.7 in)	4 years	33 of 100 (Routine)
12 December 2009	Montebello, US	daily rain	50.8 mm (2.0 in)	40.6 mm (1.6 in)	12 years	27 of 100 (Routine)

Climate Trend

13 complete years, 1979 to 1999

One stripe for each of 13 complete years at Montebello, 1979 to 1999. Blue stripes are years cooler than the station's own mean of 19.5 C (67.0 F); red stripes are warmer. The coolest year was 1982, at 18.9 C (66.0 F), and the warmest was 1990, at 20.1 C (68.1 F). The strongest colour marks a difference of 0.6 C (1.1 F).

Annual mean temperature at Montebello as warming stripes, 1979 to 1999
Year	Annual mean temperature	Difference from the station mean
1979	19.5 C	+0.03 C
1980	19.4 C	-0.07 C
1981	19.7 C	+0.19 C
1982	18.9 C	-0.59 C
1983	19.7 C	+0.24 C
1985	19.2 C	-0.27 C
1986	19.8 C	+0.37 C
1987	19.3 C	-0.17 C
1989	19.6 C	+0.13 C
1990	20.1 C	+0.60 C
1993	19.7 C	+0.23 C
1998	19.0 C	-0.44 C
1999	19.3 C	-0.21 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

1979 to 2011

Yearly extremes at Montebello: 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)	2010	40.6 C (105.1 F)	33
Coldest night (TNn)	-7.2 C (19.0 F)	2011	2.8 C (37.0 F)	33
Wettest day (Rx1day)	177.8 mm (7.0 in)	2010	59.7 mm (2.3 in)	32
Wettest five days (Rx5day)	273.5 mm (10.8 in)	1980	90.1 mm (3.5 in)	32
Longest dry spell (CDD)	333 days	2007	160 days	32

Hottest day (TXx)

The hottest day of the year at Montebello, 1979 to 2011. The record is 45.0 C (113.0 F) in 2010, marked on the chart; the median year is 40.6 C (105.1 F).

Hottest day (TXx) at Montebello by year
Year	Hottest day (TXx)
1979	42.2 C (108.0 F)
1980	38.9 C (102.0 F)
1981	41.1 C (106.0 F)
1982	41.1 C (106.0 F)
1983	40.0 C (104.0 F)
1984	42.2 C (108.0 F)
1985	42.2 C (108.0 F)
1986	37.8 C (100.0 F)
1987	41.1 C (106.0 F)
1988	43.3 C (109.9 F)
1989	40.0 C (104.0 F)
1990	40.6 C (105.1 F)
1991	41.1 C (106.0 F)
1992	38.9 C (102.0 F)
1993	37.8 C (100.0 F)
1994	40.6 C (105.1 F)
1995	38.3 C (100.9 F)
1996	42.2 C (108.0 F)
1997	38.9 C (102.0 F)
1998	41.1 C (106.0 F)
1999	40.6 C (105.1 F)
2000	40.6 C (105.1 F)
2001	37.2 C (99.0 F)
2002	41.7 C (107.1 F)
2003	38.9 C (102.0 F)
2004	40.6 C (105.1 F)
2005	39.4 C (102.9 F)
2006	40.0 C (104.0 F)
2007	43.3 C (109.9 F)
2008	39.4 C (102.9 F)
2009	41.1 C (106.0 F)
2010	45.0 C (113.0 F)
2011	36.7 C (98.1 F)

Coldest night (TNn)

The coldest night of the year at Montebello, 1979 to 2011. The record is -7.2 C (19.0 F) in 2011, marked on the chart; the median year is 2.8 C (37.0 F).

Coldest night (TNn) at Montebello by year
Year	Coldest night (TNn)
1979	-0.6 C (30.9 F)
1980	3.3 C (37.9 F)
1981	-1.1 C (30.0 F)
1982	-1.1 C (30.0 F)
1983	4.4 C (39.9 F)
1984	3.3 C (37.9 F)
1985	3.3 C (37.9 F)
1986	3.3 C (37.9 F)
1987	0.0 C (32.0 F)
1988	0.0 C (32.0 F)
1989	0.0 C (32.0 F)
1990	-1.1 C (30.0 F)
1991	3.3 C (37.9 F)
1992	2.2 C (36.0 F)
1993	3.9 C (39.0 F)
1994	3.9 C (39.0 F)
1995	5.6 C (42.1 F)
1996	3.3 C (37.9 F)
1997	2.8 C (37.0 F)
1998	1.7 C (35.1 F)
1999	3.3 C (37.9 F)
2000	4.4 C (39.9 F)
2001	0.0 C (32.0 F)
2002	1.1 C (34.0 F)
2003	3.9 C (39.0 F)
2004	2.8 C (37.0 F)
2005	5.6 C (42.1 F)
2006	2.2 C (36.0 F)
2007	0.6 C (33.1 F)
2008	3.9 C (39.0 F)
2009	-1.7 C (28.9 F)
2010	1.7 C (35.1 F)
2011	-7.2 C (19.0 F)

Wettest day (Rx1day)

The wettest day of the year at Montebello, 1979 to 2011. The record is 177.8 mm (7.0 in) in 2010, marked on the chart; the median year is 59.7 mm (2.3 in).

Wettest day (Rx1day) at Montebello by year
Year	Wettest day (Rx1day)
1979	73.7 mm (2.9 in)
1980	77.7 mm (3.1 in)
1981	48.3 mm (1.9 in)
1982	59.4 mm (2.3 in)
1983	96.5 mm (3.8 in)
1984	36.6 mm (1.4 in)
1985	36.3 mm (1.4 in)
1986	82.8 mm (3.3 in)
1987	30.5 mm (1.2 in)
1988	53.3 mm (2.1 in)
1989	20.3 mm (0.8 in)
1990	94.0 mm (3.7 in)
1991	73.4 mm (2.9 in)
1992	122.4 mm (4.8 in)
1993	124.5 mm (4.9 in)
1994	25.4 mm (1.0 in)
1995	83.1 mm (3.3 in)
1996	50.8 mm (2.0 in)
1997	71.1 mm (2.8 in)
1998	80.5 mm (3.2 in)
1999	38.1 mm (1.5 in)
2000	59.9 mm (2.4 in)
2001	90.7 mm (3.6 in)
2002	43.9 mm (1.7 in)
2003	127.0 mm (5.0 in)
2004	22.9 mm (0.9 in)
2005	160.0 mm (6.3 in)
2006	0.0 mm (0.00 in)
2007	50.8 mm (2.0 in)
2008	0.0 mm (0.00 in)
2009	50.8 mm (2.0 in)
2010	177.8 mm (7.0 in)
2011	n/a

Wettest five days (Rx5day)

The wettest five days of the year at Montebello, 1979 to 2011. The record is 273.5 mm (10.8 in) in 1980, marked on the chart; the median year is 90.1 mm (3.5 in).

Wettest five days (Rx5day) at Montebello by year
Year	Wettest five days (Rx5day)
1979	106.9 mm (4.2 in)
1980	273.5 mm (10.8 in)
1981	72.9 mm (2.9 in)
1982	97.0 mm (3.8 in)
1983	253.9 mm (10.0 in)
1984	84.9 mm (3.3 in)
1985	59.7 mm (2.4 in)
1986	130.2 mm (5.1 in)
1987	40.1 mm (1.6 in)
1988	62.2 mm (2.4 in)
1989	25.4 mm (1.0 in)
1990	113.1 mm (4.5 in)
1991	135.2 mm (5.3 in)
1992	155.4 mm (6.1 in)
1993	189.7 mm (7.5 in)
1994	48.5 mm (1.9 in)
1995	146.9 mm (5.8 in)
1996	106.2 mm (4.2 in)
1997	95.0 mm (3.7 in)
1998	200.7 mm (7.9 in)
1999	41.7 mm (1.6 in)
2000	85.1 mm (3.4 in)
2001	104.9 mm (4.1 in)
2002	79.4 mm (3.1 in)
2003	190.5 mm (7.5 in)
2004	0.0 mm (0.00 in)
2005	63.5 mm (2.5 in)
2006	0.0 mm (0.00 in)
2007	50.8 mm (2.0 in)
2008	0.0 mm (0.00 in)
2009	50.8 mm (2.0 in)
2010	177.8 mm (7.0 in)
2011	n/a

Longest dry spell (CDD)

The longest dry spell of the year at Montebello, 1979 to 2011. The record is 333 days in 2007, marked on the chart; the median year is 160 days.

Longest dry spell (CDD) at Montebello by year
Year	Longest dry spell (CDD)
1979	204 days
1980	196 days
1981	164 days
1982	75 days
1983	108 days
1984	109 days
1985	117 days
1986	169 days
1987	85 days
1988	166 days
1989	177 days
1990	127 days
1991	71 days
1992	66 days
1993	158 days
1994	138 days
1995	72 days
1996	166 days
1997	137 days
1998	178 days
1999	159 days
2000	118 days
2001	234 days
2002	160 days
2003	180 days
2004	173 days
2005	133 days
2006	162 days
2007	333 days
2008	121 days
2009	226 days
2010	168 days
2011	n/a

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