Upland Weather Records (USC00049157)

Record envelope, standing records and threshold days for Upland (USC00049157), California, United States, with 57 years of record.

Key Facts for Upland

Upland (USC00049157) is a weather station in California, United States at 34.13 latitude and -117.68 longitude, 561 m (1,841 ft) above sea level.
The station reports from 1903 to 1959, 57 years of record.
1,464 records set at Upland still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Upland set a daily record precipitation of 10.2 mm (0.4 in) on 13 September 1959.

About the Station

Location: California, United States, 34.13 latitude, -117.68 longitude.
Elevation: 561 m (1,841 ft).
Period of record: 1903 to 1959, 57 years.
Eligible elements: 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 Upland. 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 Upland, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	31.1 C (88.0 F)	-5.0 C (23.0 F)	n/a	n/a
Feb	30.6 C (87.1 F)	-3.3 C (26.1 F)	n/a	n/a
Mar	31.1 C (88.0 F)	-1.7 C (28.9 F)	n/a	n/a
Apr	36.7 C (98.1 F)	-1.7 C (28.9 F)	n/a	n/a
May	38.3 C (100.9 F)	1.7 C (35.1 F)	n/a	n/a
Jun	40.6 C (105.1 F)	3.9 C (39.0 F)	n/a	n/a
Jul	42.2 C (108.0 F)	5.6 C (42.1 F)	n/a	n/a
Aug	41.7 C (107.1 F)	5.6 C (42.1 F)	n/a	n/a
Sep	43.9 C (111.0 F)	5.6 C (42.1 F)	n/a	n/a
Oct	38.9 C (102.0 F)	0.6 C (33.1 F)	n/a	n/a
Nov	32.8 C (91.0 F)	-1.1 C (30.0 F)	n/a	n/a
Dec	31.1 C (88.0 F)	-3.3 C (26.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Upland still stand. 1949 holds the most, with 112.

Standing records at Upland by the year they were set
Year set	Standing records
1903	52
1904	41
1905	46
1906	78
1907	51
1908	45
1909	43
1910	65
1911	36
1944	78
1945	57
1947	78
1948	60
1949	112
1950	49
1951	56
1952	50
1953	80
1954	85
1955	59
1956	62
1957	64
1958	69
1959	48

Wettest Day of Each Month

Jan: 185.9 mm (7.3 in)

The wettest day on record for each calendar month at Upland. The most was 185.9 mm (7.3 in) on 22 January 1943.

Record daily precipitation for each month at Upland
Month	Record daily precipitation (mm)	Date
Jan	185.9 mm (7.3 in)	22 January 1943
Feb	94.5 mm (3.7 in)	20 February 1941
Mar	129.3 mm (5.1 in)	3 March 1938
Apr	95.3 mm (3.8 in)	26 April 1931
May	40.6 mm (1.6 in)	2 May 1905
Jun	14.2 mm (0.6 in)	5 June 1934
Jul	13.5 mm (0.5 in)	25 July 1956
Aug	18.8 mm (0.7 in)	28 August 1931
Sep	65.5 mm (2.6 in)	26 September 1939
Oct	93.2 mm (3.7 in)	17 October 1934
Nov	82.3 mm (3.2 in)	11 November 1944
Dec	151.1 mm (5.9 in)	31 December 1933

Period of Record Coverage

1903 to 1959

24 years of record at Upland, 1903 to 1959. 2 years have data for under 90 percent of days and are left out of rankings: 1956, 1959.

Days with data per year at Upland
Year	Days with data	Share of year	Complete
1903	360	99%	Yes
1904	363	99%	Yes
1905	363	99%	Yes
1906	359	98%	Yes
1907	359	98%	Yes
1908	352	96%	Yes
1909	365	100%	Yes
1910	365	100%	Yes
1911	333	91%	Yes
1944	366	100%	Yes
1945	365	100%	Yes
1947	364	100%	Yes
1948	361	99%	Yes
1949	349	96%	Yes
1950	364	100%	Yes
1951	365	100%	Yes
1952	360	98%	Yes
1953	361	99%	Yes
1954	361	99%	Yes
1955	358	98%	Yes
1956	316	86%	No
1957	365	100%	Yes
1958	365	100%	Yes
1959	273	75%	No

Latest Records

Latest records at Upland
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
13 September 1959	Upland, US	daily rain	10.2 mm (0.4 in)	10.2 mm (0.4 in)	56 years	20 of 100 (Routine)
13 June 1959	Upland, US	daily rain	1.3 mm (0.05 in)	1.0 mm (0.04 in)	4 years	8 of 100 (Routine)
11 February 1959	Upland, US	daily rain	42.2 mm (1.7 in)	6.6 mm (0.26 in)	17 years	13 of 100 (Routine)
6 January 1959	Upland, US	daily rain	51.3 mm (2.0 in)	9.6 mm (0.38 in)	21 years	14 of 100 (Routine)
23 September 1958	Upland, US	daily rain	5.3 mm (0.21 in)	3.3 mm (0.13 in)	24 years	15 of 100 (Routine)
7 September 1958	Upland, US	daily rain	0.5 mm (0.02 in)	0.5 mm (0.02 in)	55 years	20 of 100 (Routine)
15 August 1958	Upland, US	daily rain	13.0 mm (0.5 in)	12.5 mm (0.5 in)	24 years	20 of 100 (Routine)
16 June 1958	Upland, US	daily rain	1.8 mm (0.07 in)	1.8 mm (0.07 in)	55 years	20 of 100 (Routine)
12 May 1958	Upland, US	daily rain	4.1 mm (0.16 in)	3.1 mm (0.12 in)	0 years	8 of 100 (Routine)
7 April 1958	Upland, US	daily rain	47.5 mm (1.9 in)	40.9 mm (1.6 in)	5 years	41 of 100 (Notable)
2 April 1958	Upland, US	daily rain	26.4 mm (1.0 in)	11.2 mm (0.4 in)	19 years	19 of 100 (Routine)
1 April 1958	Upland, US	daily rain	69.9 mm (2.8 in)	31.0 mm (1.2 in)	55 years	47 of 100 (Notable)
6 March 1958	Upland, US	daily rain	28.4 mm (1.1 in)	23.8 mm (0.9 in)	48 years	31 of 100 (Routine)
25 February 1958	Upland, US	daily rain	39.4 mm (1.6 in)	5.4 mm (0.21 in)	20 years	13 of 100 (Routine)
19 February 1958	Upland, US	daily rain	48.3 mm (1.9 in)	36.4 mm (1.4 in)	24 years	31 of 100 (Routine)
3 February 1958	Upland, US	daily rain	57.2 mm (2.3 in)	5.9 mm (0.23 in)	47 years	22 of 100 (Routine)
16 December 1957	Upland, US	daily rain	40.9 mm (1.6 in)	28.5 mm (1.1 in)	24 years	23 of 100 (Routine)
15 December 1957	Upland, US	daily rain	69.3 mm (2.7 in)	9.9 mm (0.39 in)	20 years	14 of 100 (Routine)
5 December 1957	Upland, US	daily rain	39.6 mm (1.6 in)	6.3 mm (0.25 in)	6 years	8 of 100 (Routine)
4 November 1957	Upland, US	daily rain	1.0 mm (0.04 in)	0.5 mm (0.02 in)	4 years	6 of 100 (Routine)

Climate Trend

20 complete years, 1903 to 1958

One stripe for each of 20 complete years at Upland, 1903 to 1958. Blue stripes are years cooler than the station's own mean of 16.4 C (61.5 F); red stripes are warmer. The coolest year was 1905, at 15.1 C (59.2 F), and the warmest was 1958, at 18.0 C (64.4 F). The strongest colour marks a difference of 1.7 C (3.1 F).

Annual mean temperature at Upland as warming stripes, 1903 to 1958
Year	Annual mean temperature	Difference from the station mean
1903	16.0 C	-0.42 C
1904	16.3 C	-0.10 C
1905	15.1 C	-1.27 C
1906	15.9 C	-0.45 C
1907	16.4 C	-0.03 C
1908	16.4 C	-0.01 C
1909	16.2 C	-0.23 C
1910	16.5 C	+0.10 C
1944	15.6 C	-0.74 C
1945	16.0 C	-0.34 C
1947	16.9 C	+0.48 C
1948	16.0 C	-0.37 C
1950	16.6 C	+0.22 C
1951	16.2 C	-0.20 C
1952	16.3 C	-0.09 C
1953	16.5 C	+0.11 C
1954	17.4 C	+1.05 C
1955	16.2 C	-0.17 C
1957	17.2 C	+0.83 C
1958	18.0 C	+1.60 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

1903 to 1959

Yearly extremes at Upland: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.9 C (111.0 F)	1955	40.3 C (104.5 F)	24
Coldest night (TNn)	-5.0 C (23.0 F)	1949	-2.2 C (28.0 F)	24
Wettest day (Rx1day)	185.9 mm (7.3 in)	1943	80.0 mm (3.1 in)	37
Wettest five days (Rx5day)	367.5 mm (14.5 in)	1943	134.9 mm (5.3 in)	37
Longest dry spell (CDD)	196 days	1954	118 days	37

Hottest day (TXx)

The hottest day of the year at Upland, 1903 to 1959. The record is 43.9 C (111.0 F) in 1955, marked on the chart; the median year is 40.3 C (104.5 F).

Hottest day (TXx) at Upland by year
Year	Hottest day (TXx)
1903	37.8 C (100.0 F)
1904	38.3 C (100.9 F)
1905	37.2 C (99.0 F)
1906	38.3 C (100.9 F)
1907	42.2 C (108.0 F)
1908	40.6 C (105.1 F)
1909	41.1 C (106.0 F)
1910	40.6 C (105.1 F)
1911	40.0 C (104.0 F)
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	41.7 C (107.1 F)
1945	39.4 C (102.9 F)
1947	40.0 C (104.0 F)
1948	41.1 C (106.0 F)
1949	41.1 C (106.0 F)
1950	40.0 C (104.0 F)
1951	39.4 C (102.9 F)
1952	38.3 C (100.9 F)
1953	40.6 C (105.1 F)
1954	38.9 C (102.0 F)
1955	43.9 C (111.0 F)
1956	40.6 C (105.1 F)
1957	41.7 C (107.1 F)
1958	40.0 C (104.0 F)
1959	40.6 C (105.1 F)

Coldest night (TNn)

The coldest night of the year at Upland, 1903 to 1959. The record is -5.0 C (23.0 F) in 1949, marked on the chart; the median year is -2.2 C (28.0 F).

Coldest night (TNn) at Upland by year
Year	Coldest night (TNn)
1903	-3.3 C (26.1 F)
1904	-2.2 C (28.0 F)
1905	-2.2 C (28.0 F)
1906	-1.1 C (30.0 F)
1907	-2.2 C (28.0 F)
1908	-2.8 C (27.0 F)
1909	-3.3 C (26.1 F)
1910	-3.3 C (26.1 F)
1911	-2.8 C (27.0 F)
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	-1.7 C (28.9 F)
1945	-1.7 C (28.9 F)
1947	-1.7 C (28.9 F)
1948	-2.8 C (27.0 F)
1949	-5.0 C (23.0 F)
1950	-2.8 C (27.0 F)
1951	-2.8 C (27.0 F)
1952	-2.8 C (27.0 F)
1953	-1.7 C (28.9 F)
1954	-0.6 C (30.9 F)
1955	-1.7 C (28.9 F)
1956	-1.7 C (28.9 F)
1957	-2.2 C (28.0 F)
1958	0.0 C (32.0 F)
1959	0.6 C (33.1 F)

Wettest day (Rx1day)

The wettest day of the year at Upland, 1903 to 1959. The record is 185.9 mm (7.3 in) in 1943, marked on the chart; the median year is 80.0 mm (3.1 in).

Wettest day (Rx1day) at Upland by year
Year	Wettest day (Rx1day)
1903	82.8 mm (3.3 in)
1904	80.0 mm (3.1 in)
1905	105.9 mm (4.2 in)
1906	76.7 mm (3.0 in)
1907	78.7 mm (3.1 in)
1908	68.6 mm (2.7 in)
1909	151.6 mm (6.0 in)
1910	53.1 mm (2.1 in)
1911	103.4 mm (4.1 in)
1931	95.3 mm (3.8 in)
1932	73.7 mm (2.9 in)
1933	151.1 mm (5.9 in)
1934	93.2 mm (3.7 in)
1935	48.0 mm (1.9 in)
1936	59.4 mm (2.3 in)
1937	82.3 mm (3.2 in)
1938	129.3 mm (5.1 in)
1939	65.5 mm (2.6 in)
1940	95.8 mm (3.8 in)
1941	94.5 mm (3.7 in)
1942	57.2 mm (2.3 in)
1943	185.9 mm (7.3 in)
1944	88.6 mm (3.5 in)
1945	139.4 mm (5.5 in)
1947	27.4 mm (1.1 in)
1948	38.4 mm (1.5 in)
1949	67.8 mm (2.7 in)
1950	50.0 mm (2.0 in)
1951	77.5 mm (3.1 in)
1952	88.4 mm (3.5 in)
1953	37.1 mm (1.5 in)
1954	101.6 mm (4.0 in)
1955	33.3 mm (1.3 in)
1956	127.3 mm (5.0 in)
1957	69.3 mm (2.7 in)
1958	94.7 mm (3.7 in)
1959	51.3 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Upland, 1903 to 1959. The record is 367.5 mm (14.5 in) in 1943, marked on the chart; the median year is 134.9 mm (5.3 in).

Wettest five days (Rx5day) at Upland by year
Year	Wettest five days (Rx5day)
1903	138.2 mm (5.4 in)
1904	97.8 mm (3.9 in)
1905	144.8 mm (5.7 in)
1906	149.9 mm (5.9 in)
1907	162.8 mm (6.4 in)
1908	132.1 mm (5.2 in)
1909	196.3 mm (7.7 in)
1910	160.3 mm (6.3 in)
1911	159.5 mm (6.3 in)
1931	134.9 mm (5.3 in)
1932	148.3 mm (5.8 in)
1933	166.4 mm (6.6 in)
1934	226.0 mm (8.9 in)
1935	84.6 mm (3.3 in)
1936	162.8 mm (6.4 in)
1937	117.9 mm (4.6 in)
1938	280.4 mm (11.0 in)
1939	133.8 mm (5.3 in)
1940	126.3 mm (5.0 in)
1941	138.5 mm (5.5 in)
1942	57.2 mm (2.3 in)
1943	367.5 mm (14.5 in)
1944	196.4 mm (7.7 in)
1945	248.2 mm (9.8 in)
1947	58.5 mm (2.3 in)
1948	77.5 mm (3.1 in)
1949	128.1 mm (5.0 in)
1950	61.7 mm (2.4 in)
1951	134.7 mm (5.3 in)
1952	135.7 mm (5.3 in)
1953	37.1 mm (1.5 in)
1954	129.1 mm (5.1 in)
1955	67.4 mm (2.7 in)
1956	233.8 mm (9.2 in)
1957	133.8 mm (5.3 in)
1958	122.9 mm (4.8 in)
1959	72.4 mm (2.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Upland, 1903 to 1959. The record is 196 days in 1954, marked on the chart; the median year is 118 days.

Longest dry spell (CDD) at Upland by year
Year	Longest dry spell (CDD)
1903	126 days
1904	159 days
1905	118 days
1906	136 days
1907	113 days
1908	126 days
1909	97 days
1910	80 days
1911	137 days
1931	42 days
1932	118 days
1933	66 days
1934	74 days
1935	16 days
1936	25 days
1937	187 days
1938	97 days
1939	101 days
1940	181 days
1941	64 days
1942	103 days
1943	103 days
1944	140 days
1945	72 days
1947	88 days
1948	136 days
1949	140 days
1950	142 days
1951	136 days
1952	142 days
1953	136 days
1954	196 days
1955	166 days
1956	94 days
1957	135 days
1958	59 days
1959	91 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.

Rainfall Return Levels

33 years, 1903 to 1958

A day with at least 82.1 mm (3.2 in) of rain is expected about once in 2 years. A day with at least 194.5 mm (7.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Upland: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	82.1 mm (3.2 in)
5 years	115.0 mm (4.5 in)
10 years	135.6 mm (5.3 in)
25 years	160.3 mm (6.3 in)
50 years	177.8 mm (7.0 in)	Longer than the 33 years of record
100 years	194.5 mm (7.7 in)	Longer than the 33 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, 33 years of values from 1903 to 1958.

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: 185.9 mm (7.3 in) in 1943; 151.6 mm (6.0 in) in 1909; 151.1 mm (5.9 in) in 1933.

Download the Data

Data for Upland standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Upland 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 2026-10-14 (14 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).