Fontana Kaiser Weather Records (USC00043120)

Record envelope, standing records and threshold days for Fontana Kaiser (USC00043120), California, United States, with 34 years of record.

Key Facts for Fontana Kaiser

Fontana Kaiser (USC00043120) is a weather station in California, United States at 34.08 latitude and -117.52 longitude, 336 m (1,102 ft) above sea level.
The station reports from 1951 to 1984, 34 years of record.
1,464 records set at Fontana Kaiser still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Fontana Kaiser set a daily record high maximum temperature of 40.6 C (105.1 F) on 17 August 1984.

About the Station

Location: California, United States, 34.08 latitude, -117.52 longitude.
Elevation: 336 m (1,102 ft).
Period of record: 1951 to 1984, 34 years.
Eligible elements: tmax, tmin, 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 Fontana Kaiser. 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 Fontana Kaiser, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	33.9 C (93.0 F)	-5.6 C (21.9 F)	n/a	n/a
Feb	33.3 C (91.9 F)	-2.2 C (28.0 F)	n/a	n/a
Mar	36.1 C (97.0 F)	-1.1 C (30.0 F)	n/a	n/a
Apr	38.9 C (102.0 F)	-1.1 C (30.0 F)	n/a	n/a
May	44.4 C (111.9 F)	1.7 C (35.1 F)	n/a	n/a
Jun	43.9 C (111.0 F)	5.6 C (42.1 F)	n/a	n/a
Jul	45.6 C (114.1 F)	8.9 C (48.0 F)	n/a	n/a
Aug	43.9 C (111.0 F)	8.9 C (48.0 F)	n/a	n/a
Sep	47.2 C (117.0 F)	6.7 C (44.1 F)	n/a	n/a
Oct	42.2 C (108.0 F)	0.6 C (33.1 F)	n/a	n/a
Nov	35.6 C (96.1 F)	-1.1 C (30.0 F)	n/a	n/a
Dec	33.9 C (93.0 F)	-5.0 C (23.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Fontana Kaiser still stand. 1962 holds the most, with 70.

Standing records at Fontana Kaiser by the year they were set
Year set	Standing records
1951	37
1952	54
1953	36
1954	44
1955	44
1956	43
1957	32
1958	33
1959	47
1960	49
1961	39
1962	70
1963	23
1964	45
1965	64
1966	32
1967	63
1968	47
1969	42
1970	29
1971	64
1972	58
1973	40
1974	39
1975	36
1976	42
1977	23
1978	48
1979	59
1980	42
1981	27
1982	44
1983	40
1984	29

Wettest Day of Each Month

Jan: 154.2 mm (6.1 in)

The wettest day on record for each calendar month at Fontana Kaiser. The most was 154.2 mm (6.1 in) on 26 January 1956.

Record daily precipitation for each month at Fontana Kaiser
Month	Record daily precipitation (mm)	Date
Jan	154.2 mm (6.1 in)	26 January 1956
Feb	68.6 mm (2.7 in)	14 February 1954
Mar	91.9 mm (3.6 in)	8 March 1968
Apr	35.1 mm (1.4 in)	1 April 1982
May	16.8 mm (0.7 in)	6 May 1969
Jun	14.5 mm (0.6 in)	10 June 1957
Jul	4.6 mm (0.18 in)	29 July 1968
Aug	46.2 mm (1.8 in)	17 August 1977
Sep	28.2 mm (1.1 in)	17 September 1963
Oct	39.9 mm (1.6 in)	1 October 1983
Nov	72.4 mm (2.9 in)	30 November 1982
Dec	64.8 mm (2.6 in)	23 December 1971

Period of Record Coverage

1951 to 1984

34 years of record at Fontana Kaiser, 1951 to 1984. 5 years have data for under 90 percent of days and are left out of rankings: 1951, 1953, 1959, 1983, 1984.

Days with data per year at Fontana Kaiser
Year	Days with data	Share of year	Complete
1951	296	81%	No
1952	355	97%	Yes
1953	312	85%	No
1954	338	93%	Yes
1955	357	98%	Yes
1956	352	96%	Yes
1957	351	96%	Yes
1958	361	99%	Yes
1959	321	88%	No
1960	345	94%	Yes
1961	362	99%	Yes
1962	356	98%	Yes
1963	347	95%	Yes
1964	361	99%	Yes
1965	362	99%	Yes
1966	360	99%	Yes
1967	356	98%	Yes
1968	365	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	329	90%	Yes
1974	365	100%	Yes
1975	364	100%	Yes
1976	365	100%	Yes
1977	364	100%	Yes
1978	359	98%	Yes
1979	357	98%	Yes
1980	361	99%	Yes
1981	363	99%	Yes
1982	341	93%	Yes
1983	299	82%	No
1984	205	56%	No

Latest Records

Latest records at Fontana Kaiser
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 August 1984	Fontana Kaiser, US	daily high max	40.6 C (105.1 F)	1.7 C (3.1 F)	27 years	15 of 100 (Routine)
16 August 1984	Fontana Kaiser, US	daily high max	40.0 C (104.0 F)	1.1 C (2.0 F)	27 years	14 of 100 (Routine)
26 July 1984	Fontana Kaiser, US	daily high max (Tie)	41.7 C (107.1 F)	tie	7 years	1 of 100 (Routine)
24 July 1984	Fontana Kaiser, US	daily low min (Tie)	13.3 C (55.9 F)	tie	26 years	2 of 100 (Routine)
9 July 1984	Fontana Kaiser, US	daily high max (Tie)	42.2 C (108.0 F)	tie	25 years	2 of 100 (Routine)
5 July 1984	Fontana Kaiser, US	daily high max	41.7 C (107.1 F)	0.6 C (1.1 F)	14 years	8 of 100 (Routine)
2 July 1984	Fontana Kaiser, US	daily high max	41.7 C (107.1 F)	1.1 C (2.0 F)	14 years	10 of 100 (Routine)
1 July 1984	Fontana Kaiser, US	daily high max	40.0 C (104.0 F)	0.6 C (1.1 F)	15 years	8 of 100 (Routine)
23 June 1984	Fontana Kaiser, US	daily low min (Tie)	10.6 C (51.1 F)	tie	32 years	3 of 100 (Routine)
29 May 1984	Fontana Kaiser, US	monthly high max	44.4 C (111.9 F)	1.6 C (2.9 F)	10 years	19 of 100 (Routine)
28 May 1984	Fontana Kaiser, US	daily high max	41.1 C (106.0 F)	0.5 C (0.9 F)	11 years	6 of 100 (Routine)
24 May 1984	Fontana Kaiser, US	daily high max (Tie)	33.3 C (91.9 F)	tie	32 years	3 of 100 (Routine)
9 May 1984	Fontana Kaiser, US	daily high max	36.7 C (98.1 F)	1.7 C (3.1 F)	3 years	6 of 100 (Routine)
8 May 1984	Fontana Kaiser, US	daily high max	38.9 C (102.0 F)	6.1 C (11.0 F)	23 years	20 of 100 (Routine)
7 May 1984	Fontana Kaiser, US	daily high max	37.8 C (100.0 F)	4.5 C (8.1 F)	22 years	17 of 100 (Routine)
1 May 1984	Fontana Kaiser, US	daily low min	6.1 C (43.0 F)	0.6 C (1.1 F)	33 years	14 of 100 (Routine)
28 April 1984	Fontana Kaiser, US	daily low min	1.7 C (35.1 F)	3.3 C (5.9 F)	14 years	17 of 100 (Routine)
23 April 1984	Fontana Kaiser, US	daily high max	36.1 C (97.0 F)	1.1 C (2.0 F)	22 years	11 of 100 (Routine)
16 April 1984	Fontana Kaiser, US	daily high max	35.0 C (95.0 F)	0.6 C (1.1 F)	30 years	13 of 100 (Routine)
14 April 1984	Fontana Kaiser, US	monthly high max	38.9 C (102.0 F)	1.1 C (2.0 F)	23 years	21 of 100 (Routine)

Climate Trend

27 complete years, 1952 to 1982

One stripe for each of 27 complete years at Fontana Kaiser, 1952 to 1982. Blue stripes are years cooler than the station's own mean of 18.9 C (66.0 F); red stripes are warmer. The coolest year was 1982, at 17.1 C (62.7 F), and the warmest was 1972, at 20.3 C (68.5 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Fontana Kaiser as warming stripes, 1952 to 1982
Year	Annual mean temperature	Difference from the station mean
1952	17.5 C	-1.41 C
1954	18.0 C	-0.91 C
1955	17.8 C	-1.03 C
1956	18.7 C	-0.18 C
1957	18.7 C	-0.18 C
1958	19.6 C	+0.76 C
1960	19.2 C	+0.30 C
1961	19.1 C	+0.24 C
1962	18.5 C	-0.36 C
1964	18.9 C	+0.07 C
1965	18.4 C	-0.42 C
1966	19.6 C	+0.76 C
1967	20.0 C	+1.13 C
1968	20.1 C	+1.27 C
1969	19.9 C	+1.01 C
1970	20.2 C	+1.29 C
1971	19.8 C	+0.90 C
1972	20.3 C	+1.44 C
1974	19.2 C	+0.37 C
1975	18.4 C	-0.47 C
1976	19.4 C	+0.55 C
1977	19.1 C	+0.19 C
1978	18.0 C	-0.91 C
1979	17.4 C	-1.45 C
1980	18.1 C	-0.79 C
1981	18.5 C	-0.32 C
1982	17.1 C	-1.81 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

1951 to 1984

Yearly extremes at Fontana Kaiser: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	47.2 C (117.0 F)	1955	42.5 C (108.5 F)	34
Coldest night (TNn)	-5.6 C (21.9 F)	1979	-1.1 C (30.0 F)	34
Wettest day (Rx1day)	154.2 mm (6.1 in)	1956	47.6 mm (1.9 in)	34
Wettest five days (Rx5day)	262.7 mm (10.3 in)	1980	83.3 mm (3.3 in)	34
Longest dry spell (CDD)	265 days	1970	128 days	34

Hottest day (TXx)

The hottest day of the year at Fontana Kaiser, 1951 to 1984. The record is 47.2 C (117.0 F) in 1955, marked on the chart; the median year is 42.5 C (108.5 F).

Hottest day (TXx) at Fontana Kaiser by year
Year	Hottest day (TXx)
1951	40.6 C (105.1 F)
1952	39.4 C (102.9 F)
1953	42.2 C (108.0 F)
1954	38.9 C (102.0 F)
1955	47.2 C (117.0 F)
1956	42.8 C (109.0 F)
1957	42.8 C (109.0 F)
1958	42.2 C (108.0 F)
1959	43.3 C (109.9 F)
1960	43.9 C (111.0 F)
1961	43.9 C (111.0 F)
1962	40.0 C (104.0 F)
1963	42.2 C (108.0 F)
1964	40.6 C (105.1 F)
1965	41.7 C (107.1 F)
1966	38.9 C (102.0 F)
1967	43.3 C (109.9 F)
1968	41.7 C (107.1 F)
1969	43.3 C (109.9 F)
1970	42.2 C (108.0 F)
1971	47.2 C (117.0 F)
1972	45.6 C (114.1 F)
1973	42.8 C (109.0 F)
1974	42.8 C (109.0 F)
1975	40.0 C (104.0 F)
1976	43.3 C (109.9 F)
1977	41.7 C (107.1 F)
1978	41.7 C (107.1 F)
1979	44.4 C (111.9 F)
1980	42.2 C (108.0 F)
1981	43.9 C (111.0 F)
1982	43.9 C (111.0 F)
1983	42.2 C (108.0 F)
1984	44.4 C (111.9 F)

Coldest night (TNn)

The coldest night of the year at Fontana Kaiser, 1951 to 1984. The record is -5.6 C (21.9 F) in 1979, marked on the chart; the median year is -1.1 C (30.0 F).

Coldest night (TNn) at Fontana Kaiser by year
Year	Coldest night (TNn)
1951	-0.6 C (30.9 F)
1952	-1.7 C (28.9 F)
1953	-2.2 C (28.0 F)
1954	-2.2 C (28.0 F)
1955	-1.1 C (30.0 F)
1956	-1.7 C (28.9 F)
1957	-2.2 C (28.0 F)
1958	0.6 C (33.1 F)
1959	-0.6 C (30.9 F)
1960	-1.1 C (30.0 F)
1961	0.0 C (32.0 F)
1962	-3.9 C (25.0 F)
1963	-0.6 C (30.9 F)
1964	-1.1 C (30.0 F)
1965	-1.1 C (30.0 F)
1966	-1.1 C (30.0 F)
1967	1.1 C (34.0 F)
1968	-2.2 C (28.0 F)
1969	1.1 C (34.0 F)
1970	0.0 C (32.0 F)
1971	1.7 C (35.1 F)
1972	-1.1 C (30.0 F)
1973	0.6 C (33.1 F)
1974	0.0 C (32.0 F)
1975	1.1 C (34.0 F)
1976	0.6 C (33.1 F)
1977	1.7 C (35.1 F)
1978	-5.0 C (23.0 F)
1979	-5.6 C (21.9 F)
1980	0.0 C (32.0 F)
1981	-0.6 C (30.9 F)
1982	-1.7 C (28.9 F)
1983	-1.1 C (30.0 F)
1984	-2.2 C (28.0 F)

Wettest day (Rx1day)

The wettest day of the year at Fontana Kaiser, 1951 to 1984. The record is 154.2 mm (6.1 in) in 1956, marked on the chart; the median year is 47.6 mm (1.9 in).

Wettest day (Rx1day) at Fontana Kaiser by year
Year	Wettest day (Rx1day)
1951	27.9 mm (1.1 in)
1952	76.7 mm (3.0 in)
1953	21.3 mm (0.8 in)
1954	68.6 mm (2.7 in)
1955	33.5 mm (1.3 in)
1956	154.2 mm (6.1 in)
1957	45.0 mm (1.8 in)
1958	45.2 mm (1.8 in)
1959	40.6 mm (1.6 in)
1960	32.0 mm (1.3 in)
1961	22.4 mm (0.9 in)
1962	62.0 mm (2.4 in)
1963	43.4 mm (1.7 in)
1964	35.3 mm (1.4 in)
1965	49.0 mm (1.9 in)
1966	49.5 mm (1.9 in)
1967	68.6 mm (2.7 in)
1968	91.9 mm (3.6 in)
1969	58.2 mm (2.3 in)
1970	84.3 mm (3.3 in)
1971	64.8 mm (2.6 in)
1972	38.6 mm (1.5 in)
1973	34.5 mm (1.4 in)
1974	49.0 mm (1.9 in)
1975	33.3 mm (1.3 in)
1976	27.9 mm (1.1 in)
1977	46.2 mm (1.8 in)
1978	69.6 mm (2.7 in)
1979	71.6 mm (2.8 in)
1980	88.1 mm (3.5 in)
1981	33.5 mm (1.3 in)
1982	72.4 mm (2.9 in)
1983	71.1 mm (2.8 in)
1984	6.4 mm (0.25 in)

Wettest five days (Rx5day)

The wettest five days of the year at Fontana Kaiser, 1951 to 1984. The record is 262.7 mm (10.3 in) in 1980, marked on the chart; the median year is 83.3 mm (3.3 in).

Wettest five days (Rx5day) at Fontana Kaiser by year
Year	Wettest five days (Rx5day)
1951	27.9 mm (1.1 in)
1952	117.1 mm (4.6 in)
1953	26.4 mm (1.0 in)
1954	109.5 mm (4.3 in)
1955	59.1 mm (2.3 in)
1956	214.2 mm (8.4 in)
1957	66.3 mm (2.6 in)
1958	77.4 mm (3.0 in)
1959	42.9 mm (1.7 in)
1960	32.5 mm (1.3 in)
1961	22.9 mm (0.9 in)
1962	81.1 mm (3.2 in)
1963	74.7 mm (2.9 in)
1964	48.8 mm (1.9 in)
1965	111.0 mm (4.4 in)
1966	104.6 mm (4.1 in)
1967	85.9 mm (3.4 in)
1968	93.7 mm (3.7 in)
1969	75.0 mm (3.0 in)
1970	105.1 mm (4.1 in)
1971	120.7 mm (4.8 in)
1972	52.8 mm (2.1 in)
1973	61.2 mm (2.4 in)
1974	144.6 mm (5.7 in)
1975	85.4 mm (3.4 in)
1976	50.2 mm (2.0 in)
1977	91.8 mm (3.6 in)
1978	171.2 mm (6.7 in)
1979	105.9 mm (4.2 in)
1980	262.7 mm (10.3 in)
1981	64.0 mm (2.5 in)
1982	118.7 mm (4.7 in)
1983	126.8 mm (5.0 in)
1984	6.4 mm (0.25 in)

Longest dry spell (CDD)

The longest dry spell of the year at Fontana Kaiser, 1951 to 1984. The record is 265 days in 1970, marked on the chart; the median year is 128 days.

Longest dry spell (CDD) at Fontana Kaiser by year
Year	Longest dry spell (CDD)
1951	81 days
1952	134 days
1953	169 days
1954	76 days
1955	189 days
1956	76 days
1957	121 days
1958	129 days
1959	181 days
1960	157 days
1961	99 days
1962	141 days
1963	74 days
1964	107 days
1965	108 days
1966	166 days
1967	119 days
1968	92 days
1969	122 days
1970	265 days
1971	135 days
1972	103 days
1973	186 days
1974	153 days
1975	187 days
1976	88 days
1977	126 days
1978	142 days
1979	171 days
1980	207 days
1981	137 days
1982	127 days
1983	104 days
1984	112 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

31 years, 1952 to 1983

A day with at least 51.3 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 144.6 mm (5.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Fontana Kaiser: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	51.3 mm (2.0 in)
5 years	74.3 mm (2.9 in)
10 years	90.2 mm (3.6 in)
25 years	111.4 mm (4.4 in)
50 years	127.7 mm (5.0 in)	Longer than the 31 years of record
100 years	144.6 mm (5.7 in)	Longer than the 31 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, 31 years of values from 1952 to 1983.

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: 154.2 mm (6.1 in) in 1956; 91.9 mm (3.6 in) in 1968; 88.1 mm (3.5 in) in 1980.

Download the Data

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