Wahweap Weather Records (USC00029114)

Record envelope, standing records and threshold days for Wahweap (USC00029114), Arizona, United States, with 52 years of record.

Key Facts for Wahweap

Wahweap (USC00029114) is a weather station in Arizona, United States at 37.00 latitude and -111.49 longitude, 1,137 m (3,730 ft) above sea level.
The station reports from 1961 to 2012, 52 years of record.
1,464 records set at Wahweap still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Wahweap set a daily record high minimum temperature of 8.3 C (46.9 F) on 3 December 2012.

About the Station

Location: Arizona, United States, 37.00 latitude, -111.49 longitude.
Elevation: 1,137 m (3,730 ft).
Period of record: 1961 to 2012, 52 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 Wahweap. 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 Wahweap, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	20.6 C (69.1 F)	-18.9 C (-2.0 F)	n/a	n/a
Feb	25.6 C (78.1 F)	-15.6 C (3.9 F)	n/a	n/a
Mar	29.4 C (84.9 F)	-6.1 C (21.0 F)	n/a	n/a
Apr	34.4 C (93.9 F)	-8.9 C (16.0 F)	n/a	n/a
May	41.1 C (106.0 F)	-1.7 C (28.9 F)	n/a	n/a
Jun	46.1 C (115.0 F)	4.4 C (39.9 F)	n/a	n/a
Jul	48.9 C (120.0 F)	8.9 C (48.0 F)	n/a	n/a
Aug	46.1 C (115.0 F)	10.6 C (51.1 F)	n/a	n/a
Sep	40.6 C (105.1 F)	2.2 C (36.0 F)	n/a	n/a
Oct	35.6 C (96.1 F)	-4.4 C (24.1 F)	n/a	n/a
Nov	26.7 C (80.1 F)	-9.4 C (15.1 F)	n/a	n/a
Dec	22.8 C (73.0 F)	-16.1 C (3.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Wahweap still stand. 1989 holds the most, with 59.

Standing records at Wahweap by the year they were set
Year set	Standing records
1961	27
1962	58
1963	25
1964	36
1965	30
1966	33
1967	40
1968	41
1969	30
1970	30
1971	45
1972	30
1973	30
1974	31
1975	43
1976	23
1977	37
1978	32
1979	38
1980	22
1981	18
1982	16
1983	30
1984	20
1985	23
1986	27
1987	15
1988	55
1989	59
1990	38
1991	19
1992	16
1993	9
1994	25
1995	39
1996	25
1997	17
1998	10
1999	31
2000	42
2001	23
2002	34
2003	29
2004	19
2005	13
2006	28
2007	23
2008	18
2009	13
2010	22
2011	16
2012	11

All-Time Record Progression

1 new records

1 all-time records were set at Wahweap between 16 July 1997 and 16 July 1997. Each dot is a new record.

Wettest Day of Each Month

Jun: 49.3 mm (1.9 in)

The wettest day on record for each calendar month at Wahweap. The most was 49.3 mm (1.9 in) on 22 June 1972.

Record daily precipitation for each month at Wahweap
Month	Record daily precipitation (mm)	Date
Jan	48.3 mm (1.9 in)	19 January 2010
Feb	22.9 mm (0.9 in)	8 February 1982
Mar	25.9 mm (1.0 in)	9 March 2010
Apr	20.8 mm (0.8 in)	21 April 1995
May	31.8 mm (1.3 in)	13 May 1965
Jun	49.3 mm (1.9 in)	22 June 1972
Jul	35.6 mm (1.4 in)	26 July 1983
Aug	37.1 mm (1.5 in)	26 August 1983
Sep	27.2 mm (1.1 in)	8 September 1961
Oct	45.7 mm (1.8 in)	23 October 1998
Nov	33.3 mm (1.3 in)	21 November 1983
Dec	35.6 mm (1.4 in)	2 December 2011

Period of Record Coverage

1961 to 2012

52 years of record at Wahweap, 1961 to 2012. 22 years have data for under 90 percent of days and are left out of rankings: 1961, 1978, 1979, 1980, 1982, 1983, 1984, 1986 and others.

Days with data per year at Wahweap
Year	Days with data	Share of year	Complete
1961	175	48%	No
1962	359	98%	Yes
1963	348	95%	Yes
1964	357	98%	Yes
1965	357	98%	Yes
1966	362	99%	Yes
1967	364	100%	Yes
1968	349	95%	Yes
1969	351	96%	Yes
1970	360	99%	Yes
1971	361	99%	Yes
1972	358	98%	Yes
1973	359	98%	Yes
1974	362	99%	Yes
1975	363	99%	Yes
1976	360	98%	Yes
1977	361	99%	Yes
1978	314	86%	No
1979	328	90%	No
1980	253	69%	No
1981	360	99%	Yes
1982	309	85%	No
1983	280	77%	No
1984	288	79%	No
1985	346	95%	Yes
1986	293	80%	No
1987	325	89%	No
1988	311	85%	No
1989	292	80%	No
1990	287	79%	No
1991	327	90%	No
1992	282	77%	No
1993	325	89%	No
1994	360	99%	Yes
1995	361	99%	Yes
1996	360	98%	Yes
1997	347	95%	Yes
1998	356	98%	Yes
1999	327	90%	No
2000	305	83%	No
2001	300	82%	No
2002	342	94%	Yes
2003	344	94%	Yes
2004	334	91%	Yes
2005	349	96%	Yes
2006	355	97%	Yes
2007	349	96%	Yes
2008	347	95%	Yes
2009	323	88%	No
2010	296	81%	No
2011	135	37%	No
2012	282	77%	No

Latest Records

Latest records at Wahweap
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
3 December 2012	Wahweap, US	daily high min	8.3 C (46.9 F)	1.1 C (2.0 F)	46 years	21 of 100 (Routine)
13 November 2012	Wahweap, US	daily low min (Tie)	-2.2 C (28.0 F)	tie	37 years	4 of 100 (Routine)
12 November 2012	Wahweap, US	daily low min	-3.3 C (26.1 F)	1.6 C (2.9 F)	20 years	15 of 100 (Routine)
11 November 2012	Wahweap, US	daily low max (Tie)	7.8 C (46.0 F)	tie	12 years	2 of 100 (Routine)
10 November 2012	Wahweap, US	daily low max	8.9 C (48.0 F)	1.7 C (3.1 F)	1 year	8 of 100 (Routine)
17 October 2012	Wahweap, US	daily high min (Tie)	15.6 C (60.1 F)	tie	1 year	1 of 100 (Routine)
6 October 2012	Wahweap, US	daily high min (Tie)	16.1 C (61.0 F)	tie	35 years	3 of 100 (Routine)
3 October 2012	Wahweap, US	daily high max (Tie)	33.9 C (93.0 F)	tie	2 years	1 of 100 (Routine)
11 September 2012	Wahweap, US	daily low max	22.8 C (73.0 F)	1.1 C (2.0 F)	9 years	9 of 100 (Routine)
14 July 2012	Wahweap, US	daily low max	27.8 C (82.0 F)	2.8 C (5.0 F)	22 years	20 of 100 (Routine)
2 July 2012	Wahweap, US	daily high min (Tie)	26.7 C (80.1 F)	tie	10 years	2 of 100 (Routine)
1 July 2012	Wahweap, US	daily high min	26.7 C (80.1 F)	0.6 C (1.1 F)	40 years	19 of 100 (Routine)
2 June 2012	Wahweap, US	daily high min	21.7 C (71.1 F)	0.6 C (1.1 F)	9 years	8 of 100 (Routine)
25 May 2012	Wahweap, US	daily high min (Tie)	20.6 C (69.1 F)	tie	9 years	1 of 100 (Routine)
22 May 2012	Wahweap, US	daily high max	37.2 C (99.0 F)	1.6 C (2.9 F)	45 years	21 of 100 (Routine)
22 May 2012	Wahweap, US	daily high min	18.9 C (66.0 F)	0.6 C (1.1 F)	22 years	12 of 100 (Routine)
2 May 2012	Wahweap, US	daily high min (Tie)	16.1 C (61.0 F)	tie	5 years	1 of 100 (Routine)
20 March 2012	Wahweap, US	daily low max	9.4 C (48.9 F)	0.6 C (1.1 F)	33 years	15 of 100 (Routine)
18 March 2012	Wahweap, US	daily rain	5.1 mm (0.20 in)	1.3 mm (0.05 in)	19 years	12 of 100 (Routine)
14 February 2012	Wahweap, US	daily rain	6.3 mm (0.25 in)	2.2 mm (0.09 in)	41 years	20 of 100 (Routine)

Climate Trend

35 complete years, 1962 to 2008

One stripe for each of 35 complete years at Wahweap, 1962 to 2008. Blue stripes are years cooler than the station's own mean of 15.8 C (60.5 F); red stripes are warmer. The coolest year was 1975, at 14.6 C (58.2 F), and the warmest was 2003, at 17.0 C (62.6 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at Wahweap as warming stripes, 1962 to 2008
Year	Annual mean temperature	Difference from the station mean
1962	16.0 C	+0.18 C
1963	16.0 C	+0.15 C
1964	15.3 C	-0.52 C
1965	15.3 C	-0.57 C
1966	16.2 C	+0.39 C
1967	15.5 C	-0.36 C
1968	14.8 C	-1.01 C
1969	16.1 C	+0.30 C
1970	15.9 C	+0.05 C
1971	15.1 C	-0.70 C
1972	16.2 C	+0.39 C
1973	15.3 C	-0.52 C
1974	15.9 C	+0.09 C
1975	14.6 C	-1.26 C
1976	15.7 C	-0.11 C
1977	16.4 C	+0.55 C
1981	16.3 C	+0.50 C
1984	15.2 C	-0.67 C
1985	15.8 C	-0.02 C
1987	15.6 C	-0.29 C
1988	15.7 C	-0.15 C
1991	15.3 C	-0.53 C
1994	16.2 C	+0.36 C
1995	16.2 C	+0.36 C
1996	16.6 C	+0.79 C
1998	15.1 C	-0.73 C
1999	15.6 C	-0.26 C
2000	16.4 C	+0.51 C
2002	16.5 C	+0.63 C
2003	17.0 C	+1.18 C
2004	16.1 C	+0.22 C
2005	16.0 C	+0.20 C
2006	16.2 C	+0.33 C
2007	16.4 C	+0.58 C
2008	15.9 C	+0.02 C

The annual mean temperature here has risen by 0.14 C (0.02 to 0.25) per decade over 1962 to 2008. In Fahrenheit: 0.25 F (0.04 to 0.46) 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 Wahweap
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.14 C (0.02 to 0.25) per decade	0.25 F (0.04 to 0.46) per decade	1962 to 2008	35	Rise
Mean daily maximum	0.18 C (0.02 to 0.35) per decade	0.33 F (0.03 to 0.62) per decade	1962 to 2008	35	Rise
Mean daily minimum	0.1 C (-0.1 to 0.3) per decade	0.2 F (-0.1 to 0.5) per decade	1962 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

1961 to 2012

Yearly extremes at Wahweap: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	48.9 C (120.0 F)	1997	41.4 C (106.5 F)	52
Coldest night (TNn)	-18.9 C (-2.0 F)	1989	-9.4 C (15.1 F)	52
Wettest day (Rx1day)	49.3 mm (1.9 in)	1972	19.5 mm (0.8 in)	52
Wettest five days (Rx5day)	99.9 mm (3.9 in)	1983	27.6 mm (1.1 in)	52
Longest dry spell (CDD)	155 days	1972	63 days	52

Hottest day (TXx)

The hottest day of the year at Wahweap, 1961 to 2012. The record is 48.9 C (120.0 F) in 1997, marked on the chart; the median year is 41.4 C (106.5 F).

Hottest day (TXx) at Wahweap by year
Year	Hottest day (TXx)
1961	46.1 C (115.0 F)
1962	41.1 C (106.0 F)
1963	41.1 C (106.0 F)
1964	41.7 C (107.1 F)
1965	43.3 C (109.9 F)
1966	41.1 C (106.0 F)
1967	41.1 C (106.0 F)
1968	41.1 C (106.0 F)
1969	41.7 C (107.1 F)
1970	42.2 C (108.0 F)
1971	42.2 C (108.0 F)
1972	42.2 C (108.0 F)
1973	41.7 C (107.1 F)
1974	41.7 C (107.1 F)
1975	39.4 C (102.9 F)
1976	41.1 C (106.0 F)
1977	41.7 C (107.1 F)
1978	40.6 C (105.1 F)
1979	41.1 C (106.0 F)
1980	40.6 C (105.1 F)
1981	41.1 C (106.0 F)
1982	39.4 C (102.9 F)
1983	38.9 C (102.0 F)
1984	38.9 C (102.0 F)
1985	41.1 C (106.0 F)
1986	40.0 C (104.0 F)
1987	38.9 C (102.0 F)
1988	41.1 C (106.0 F)
1989	42.8 C (109.0 F)
1990	43.3 C (109.9 F)
1991	39.4 C (102.9 F)
1992	40.6 C (105.1 F)
1993	41.1 C (106.0 F)
1994	43.3 C (109.9 F)
1995	46.1 C (115.0 F)
1996	41.7 C (107.1 F)
1997	48.9 C (120.0 F)
1998	41.7 C (107.1 F)
1999	43.3 C (109.9 F)
2000	41.7 C (107.1 F)
2001	41.1 C (106.0 F)
2002	42.2 C (108.0 F)
2003	43.3 C (109.9 F)
2004	40.6 C (105.1 F)
2005	42.2 C (108.0 F)
2006	42.2 C (108.0 F)
2007	42.2 C (108.0 F)
2008	40.6 C (105.1 F)
2009	41.7 C (107.1 F)
2010	42.2 C (108.0 F)
2011	40.0 C (104.0 F)
2012	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at Wahweap, 1961 to 2012. The record is -18.9 C (-2.0 F) in 1989, marked on the chart; the median year is -9.4 C (15.1 F).

Coldest night (TNn) at Wahweap by year
Year	Coldest night (TNn)
1961	-16.1 C (3.0 F)
1962	-11.1 C (12.0 F)
1963	-17.2 C (1.0 F)
1964	-13.3 C (8.1 F)
1965	-6.7 C (19.9 F)
1966	-11.7 C (10.9 F)
1967	-15.6 C (3.9 F)
1968	-13.3 C (8.1 F)
1969	-7.8 C (18.0 F)
1970	-10.0 C (14.0 F)
1971	-16.1 C (3.0 F)
1972	-9.4 C (15.1 F)
1973	-8.9 C (16.0 F)
1974	-13.9 C (7.0 F)
1975	-8.9 C (16.0 F)
1976	-9.4 C (15.1 F)
1977	-10.0 C (14.0 F)
1978	-15.0 C (5.0 F)
1979	-12.8 C (9.0 F)
1980	-3.9 C (25.0 F)
1981	-6.1 C (21.0 F)
1982	-12.2 C (10.0 F)
1983	-7.8 C (18.0 F)
1984	-8.3 C (17.1 F)
1985	-11.1 C (12.0 F)
1986	-8.3 C (17.1 F)
1987	-11.1 C (12.0 F)
1988	-10.6 C (12.9 F)
1989	-18.9 C (-2.0 F)
1990	-15.6 C (3.9 F)
1991	-11.1 C (12.0 F)
1992	-9.4 C (15.1 F)
1993	-7.8 C (18.0 F)
1994	-7.2 C (19.0 F)
1995	-6.7 C (19.9 F)
1996	-8.9 C (16.0 F)
1997	-7.8 C (18.0 F)
1998	-9.4 C (15.1 F)
1999	-8.3 C (17.1 F)
2000	-8.3 C (17.1 F)
2001	-8.3 C (17.1 F)
2002	-7.8 C (18.0 F)
2003	-5.6 C (21.9 F)
2004	-8.3 C (17.1 F)
2005	-8.9 C (16.0 F)
2006	-7.2 C (19.0 F)
2007	-11.1 C (12.0 F)
2008	-9.4 C (15.1 F)
2009	-7.8 C (18.0 F)
2010	-7.2 C (19.0 F)
2011	-12.8 C (9.0 F)
2012	-5.6 C (21.9 F)

Wettest day (Rx1day)

The wettest day of the year at Wahweap, 1961 to 2012. The record is 49.3 mm (1.9 in) in 1972, marked on the chart; the median year is 19.5 mm (0.8 in).

Wettest day (Rx1day) at Wahweap by year
Year	Wettest day (Rx1day)
1961	27.2 mm (1.1 in)
1962	8.1 mm (0.32 in)
1963	21.6 mm (0.9 in)
1964	9.7 mm (0.38 in)
1965	31.8 mm (1.3 in)
1966	13.5 mm (0.5 in)
1967	17.8 mm (0.7 in)
1968	21.6 mm (0.9 in)
1969	16.0 mm (0.6 in)
1970	16.8 mm (0.7 in)
1971	14.0 mm (0.6 in)
1972	49.3 mm (1.9 in)
1973	20.3 mm (0.8 in)
1974	6.6 mm (0.26 in)
1975	17.0 mm (0.7 in)
1976	17.5 mm (0.7 in)
1977	10.2 mm (0.4 in)
1978	23.4 mm (0.9 in)
1979	28.4 mm (1.1 in)
1980	17.8 mm (0.7 in)
1981	18.3 mm (0.7 in)
1982	22.9 mm (0.9 in)
1983	37.1 mm (1.5 in)
1984	14.5 mm (0.6 in)
1985	32.8 mm (1.3 in)
1986	16.3 mm (0.6 in)
1987	17.5 mm (0.7 in)
1988	19.3 mm (0.8 in)
1989	10.9 mm (0.4 in)
1990	21.6 mm (0.9 in)
1991	17.8 mm (0.7 in)
1992	24.1 mm (0.9 in)
1993	17.8 mm (0.7 in)
1994	14.0 mm (0.6 in)
1995	20.8 mm (0.8 in)
1996	16.5 mm (0.6 in)
1997	19.6 mm (0.8 in)
1998	45.7 mm (1.8 in)
1999	17.8 mm (0.7 in)
2000	31.8 mm (1.3 in)
2001	20.3 mm (0.8 in)
2002	20.8 mm (0.8 in)
2003	20.3 mm (0.8 in)
2004	23.1 mm (0.9 in)
2005	22.4 mm (0.9 in)
2006	27.9 mm (1.1 in)
2007	25.7 mm (1.0 in)
2008	15.7 mm (0.6 in)
2009	17.3 mm (0.7 in)
2010	48.3 mm (1.9 in)
2011	35.6 mm (1.4 in)
2012	14.0 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Wahweap, 1961 to 2012. The record is 99.9 mm (3.9 in) in 1983, marked on the chart; the median year is 27.6 mm (1.1 in).

Wettest five days (Rx5day) at Wahweap by year
Year	Wettest five days (Rx5day)
1961	29.2 mm (1.1 in)
1962	21.0 mm (0.8 in)
1963	30.5 mm (1.2 in)
1964	14.5 mm (0.6 in)
1965	31.8 mm (1.3 in)
1966	18.0 mm (0.7 in)
1967	30.7 mm (1.2 in)
1968	30.2 mm (1.2 in)
1969	16.0 mm (0.6 in)
1970	24.9 mm (1.0 in)
1971	15.3 mm (0.6 in)
1972	53.9 mm (2.1 in)
1973	24.9 mm (1.0 in)
1974	13.6 mm (0.5 in)
1975	17.0 mm (0.7 in)
1976	19.0 mm (0.7 in)
1977	14.3 mm (0.6 in)
1978	36.7 mm (1.4 in)
1979	28.4 mm (1.1 in)
1980	33.0 mm (1.3 in)
1981	46.6 mm (1.8 in)
1982	32.8 mm (1.3 in)
1983	99.9 mm (3.9 in)
1984	15.5 mm (0.6 in)
1985	33.1 mm (1.3 in)
1986	18.9 mm (0.7 in)
1987	25.6 mm (1.0 in)
1988	29.2 mm (1.1 in)
1989	39.4 mm (1.6 in)
1990	21.6 mm (0.9 in)
1991	24.2 mm (1.0 in)
1992	27.7 mm (1.1 in)
1993	38.1 mm (1.5 in)
1994	14.5 mm (0.6 in)
1995	23.1 mm (0.9 in)
1996	21.2 mm (0.8 in)
1997	33.3 mm (1.3 in)
1998	58.9 mm (2.3 in)
1999	17.8 mm (0.7 in)
2000	56.3 mm (2.2 in)
2001	31.8 mm (1.3 in)
2002	26.4 mm (1.0 in)
2003	20.5 mm (0.8 in)
2004	30.7 mm (1.2 in)
2005	27.5 mm (1.1 in)
2006	56.7 mm (2.2 in)
2007	25.7 mm (1.0 in)
2008	23.9 mm (0.9 in)
2009	33.0 mm (1.3 in)
2010	98.1 mm (3.9 in)
2011	38.1 mm (1.5 in)
2012	21.6 mm (0.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Wahweap, 1961 to 2012. The record is 155 days in 1972, marked on the chart; the median year is 63 days.

Longest dry spell (CDD) at Wahweap by year
Year	Longest dry spell (CDD)
1961	63 days
1962	52 days
1963	47 days
1964	101 days
1965	32 days
1966	75 days
1967	87 days
1968	94 days
1969	55 days
1970	47 days
1971	69 days
1972	155 days
1973	68 days
1974	103 days
1975	39 days
1976	57 days
1977	49 days
1978	71 days
1979	71 days
1980	31 days
1981	68 days
1982	63 days
1983	44 days
1984	53 days
1985	49 days
1986	49 days
1987	47 days
1988	42 days
1989	62 days
1990	35 days
1991	64 days
1992	35 days
1993	91 days
1994	34 days
1995	53 days
1996	89 days
1997	51 days
1998	75 days
1999	75 days
2000	39 days
2001	40 days
2002	110 days
2003	89 days
2004	83 days
2005	92 days
2006	83 days
2007	66 days
2008	63 days
2009	128 days
2010	90 days
2011	23 days
2012	74 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 Wahweap falls on 29 March and the median first autumn frost on 17 November, which leaves a median of 226 days between them.

Fitted over all years, the growing season changes by +5.5 days per decade at this station.

Frost dates and growing season at Wahweap
Measure	Median, all years	Earliest period	Recent period (1967 to 2008)	Recent against earliest	Fitted trend
Last spring frost	29 March	n/a	26 March	n/a	-5.5 days per decade
First autumn frost	17 November	n/a	16 November	n/a	0.0 days per decade
Growing days	226 days	n/a	227 days	n/a	+5.5 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

47 years, 1962 to 2009

A day with at least 19.0 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 49.8 mm (2.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Wahweap: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	19.0 mm (0.7 in)
5 years	26.2 mm (1.0 in)
10 years	31.4 mm (1.2 in)
25 years	38.4 mm (1.5 in)
50 years	43.9 mm (1.7 in)	Longer than the 47 years of record
100 years	49.8 mm (2.0 in)	Longer than the 47 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, 47 years of values from 1962 to 2009.

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: 49.3 mm (1.9 in) in 1972; 45.7 mm (1.8 in) in 1998; 37.1 mm (1.5 in) in 1983.

Download the Data

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