Record envelope, standing records and threshold days for Deer Flat Dam (USC00102444), Idaho, United States, with 99 years of record.
Key Facts for Deer Flat Dam
Deer Flat Dam (USC00102444) is a weather station in Idaho, United States at 43.58 latitude and -116.75 longitude, 765 m (2,510 ft) above sea level.
The station reports from 1916 to 2014, 99 years of record.
1,464 records set at Deer Flat Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Deer Flat Dam set a daily record precipitation of 8.4 mm (0.33 in) on 2 April 2014.
About the Station
Location: Idaho, United States, 43.58 latitude, -116.75 longitude.
Elevation: 765 m (2,510 ft).
Period of record: 1916 to 2014, 99 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Deer Flat Dam. 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 Deer Flat Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
19.4 C (66.9 F)
-32.8 C (-27.0 F)
n/a
n/a
Feb
20.0 C (68.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-14.4 C (6.1 F)
n/a
n/a
Apr
31.1 C (88.0 F)
-6.1 C (21.0 F)
n/a
n/a
May
36.1 C (97.0 F)
-7.2 C (19.0 F)
n/a
n/a
Jun
37.2 C (99.0 F)
-0.6 C (30.9 F)
n/a
n/a
Jul
41.7 C (107.1 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
39.4 C (102.9 F)
1.7 C (35.1 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
36.7 C (98.1 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-20.6 C (-5.1 F)
n/a
n/a
Dec
23.3 C (73.9 F)
-30.0 C (-22.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Deer Flat Dam still stand. 1985 holds the most, with 57.
Standing records at Deer Flat Dam by the year they were set
Year set
Standing records
1916
31
1917
14
1918
33
1919
21
1920
17
1921
21
1922
22
1923
12
1924
22
1925
16
1948
4
1949
28
1950
25
1951
16
1952
17
1953
31
1954
28
1955
33
1956
24
1957
18
1958
13
1959
17
1960
22
1961
17
1962
24
1963
21
1964
22
1965
28
1966
22
1967
7
1968
14
1969
17
1970
20
1971
18
1972
31
1973
13
1974
29
1975
27
1976
13
1977
25
1978
7
1979
22
1980
16
1981
10
1982
16
1983
33
1984
32
1985
57
1986
26
1987
21
1988
12
1989
20
1990
31
1991
13
1992
27
1993
23
1994
20
1995
25
1996
22
1997
21
1998
15
1999
7
2000
9
2001
10
2002
17
2003
25
2004
7
2005
8
2006
11
2007
6
2008
3
2009
9
2010
10
2011
11
2012
10
2013
19
All-Time Record Progression
4 new records
4 all-time records were set at Deer Flat Dam between 13 August 1979 and 22 July 2006. Each dot is a new record.
When Deer Flat Dam set new all-time records
Date
Kind
Detail
1979-08-13
Record daily precipitation
Record daily precipitation 37.3 mm (1.5 in)
1990-12-22
Record low maximum temperature
Record low maximum temperature -18.3 C (-0.9 F)
1990-12-24
Record low maximum temperature
Record low maximum temperature -18.9 C (-2.0 F)
2006-07-22
Record high maximum temperature
Record high maximum temperature 41.7 C (107.1 F)
Wettest Day of Each Month
Aug: 37.3 mm (1.5 in)
The wettest day on record for each calendar month at Deer Flat Dam. The most was 37.3 mm (1.5 in) on 13 August 1979.
Record daily precipitation for each month at Deer Flat Dam
Month
Record daily precipitation (mm)
Date
Jan
21.3 mm (0.8 in)
31 January 1963
Feb
31.5 mm (1.2 in)
23 February 2000
Mar
24.4 mm (1.0 in)
20 March 1981
Apr
28.7 mm (1.1 in)
14 April 1973
May
35.6 mm (1.4 in)
12 May 1958
Jun
28.4 mm (1.1 in)
6 June 1967
Jul
21.3 mm (0.8 in)
31 July 1960
Aug
37.3 mm (1.5 in)
13 August 1979
Sep
34.8 mm (1.4 in)
14 September 1959
Oct
30.5 mm (1.2 in)
29 October 1982
Nov
27.4 mm (1.1 in)
13 November 1958
Dec
24.1 mm (0.9 in)
23 December 1955
Period of Record Coverage
1916 to 2014
Complete yearUnder 90 percent of days
77 years of record at Deer Flat Dam, 1916 to 2014. 28 years have data for under 90 percent of days and are left out of rankings: 1916, 1917, 1918, 1919, 1920, 1921, 1922, 1923 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 50 complete years at Deer Flat Dam, 1949 to 2013. Blue stripes are years cooler than the station's own mean of 10.8 C (51.4 F); red stripes are warmer. The coolest year was 1984, at 9.2 C (48.5 F), and the warmest was 1992, at 12.4 C (54.4 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Deer Flat Dam as warming stripes, 1949 to 2013
Year
Annual mean temperature
Difference from the station mean
1949
10.0 C
-0.72 C
1950
10.5 C
-0.23 C
1951
10.4 C
-0.32 C
1952
10.4 C
-0.40 C
1953
11.4 C
+0.65 C
1954
10.9 C
+0.11 C
1955
9.6 C
-1.19 C
1956
10.2 C
-0.60 C
1957
9.6 C
-1.14 C
1958
11.2 C
+0.49 C
1959
10.5 C
-0.30 C
1960
10.3 C
-0.49 C
1961
10.8 C
+0.07 C
1962
10.0 C
-0.78 C
1963
10.9 C
+0.11 C
1964
9.5 C
-1.27 C
1965
10.4 C
-0.38 C
1966
11.2 C
+0.48 C
1967
11.4 C
+0.60 C
1968
10.8 C
+0.07 C
1969
10.8 C
0.00 C
1970
10.8 C
+0.09 C
1971
10.6 C
-0.19 C
1972
10.3 C
-0.48 C
1973
11.4 C
+0.63 C
1974
11.0 C
+0.26 C
1975
10.1 C
-0.63 C
1976
10.3 C
-0.50 C
1977
10.4 C
-0.31 C
1978
10.6 C
-0.11 C
1979
10.4 C
-0.33 C
1980
11.1 C
+0.36 C
1981
11.5 C
+0.77 C
1982
10.1 C
-0.62 C
1983
10.7 C
-0.10 C
1984
9.2 C
-1.59 C
1986
10.9 C
+0.13 C
1988
11.0 C
+0.24 C
1989
9.5 C
-1.27 C
1990
11.1 C
+0.34 C
1992
12.4 C
+1.69 C
1993
10.0 C
-0.73 C
1994
12.1 C
+1.38 C
1995
12.0 C
+1.28 C
1996
12.0 C
+1.25 C
1998
12.4 C
+1.65 C
2010
11.0 C
+0.23 C
2011
10.4 C
-0.34 C
2012
12.4 C
+1.68 C
2013
11.4 C
+0.62 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1949 to 2013. In Fahrenheit: 0.4 F (0.1 to 0.6) per decade. The slope is a straight line fitted to 50 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Deer Flat Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.3) per decade
0.4 F (0.1 to 0.6) per decade
1949 to 2013
50
Rise
Mean daily maximum
0.12 C (0.00 to 0.25) per decade
0.22 F (-0.01 to 0.46) per decade
1949 to 2013
50
Not clearly different from zero
Mean daily minimum
0.3 C (0.1 to 0.4) per decade
0.5 F (0.3 to 0.7) per decade
1949 to 2013
50
Rise
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
1916 to 2014
Yearly extremes at Deer Flat Dam: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
2006
37.2 C (99.0 F)
77
Coldest night (TNn)
-32.8 C (-27.0 F)
1957
-16.1 C (3.0 F)
77
Wettest day (Rx1day)
37.3 mm (1.5 in)
1979
18.0 mm (0.7 in)
77
Wettest five days (Rx5day)
57.0 mm (2.2 in)
1921
28.7 mm (1.1 in)
77
Longest dry spell (CDD)
153 days
1919
49 days
77
Hottest day (TXx)
The hottest day of the year at Deer Flat Dam, 1916 to 2014. The record is 41.7 C (107.1 F) in 2006, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Deer Flat Dam by year
Year
Hottest day (TXx)
1916
36.1 C (97.0 F)
1917
38.3 C (100.9 F)
1918
33.3 C (91.9 F)
1919
36.1 C (97.0 F)
1920
38.9 C (102.0 F)
1921
36.1 C (97.0 F)
1922
37.2 C (99.0 F)
1923
37.8 C (100.0 F)
1924
40.0 C (104.0 F)
1925
40.0 C (104.0 F)
1948
34.4 C (93.9 F)
1949
38.3 C (100.9 F)
1950
36.1 C (97.0 F)
1951
37.8 C (100.0 F)
1952
37.2 C (99.0 F)
1953
39.4 C (102.9 F)
1954
36.1 C (97.0 F)
1955
36.7 C (98.1 F)
1956
36.1 C (97.0 F)
1957
35.0 C (95.0 F)
1958
35.0 C (95.0 F)
1959
37.8 C (100.0 F)
1960
37.8 C (100.0 F)
1961
39.4 C (102.9 F)
1962
37.2 C (99.0 F)
1963
35.0 C (95.0 F)
1964
35.0 C (95.0 F)
1965
34.4 C (93.9 F)
1966
35.6 C (96.1 F)
1967
37.8 C (100.0 F)
1968
37.2 C (99.0 F)
1969
37.8 C (100.0 F)
1970
36.1 C (97.0 F)
1971
36.7 C (98.1 F)
1972
36.7 C (98.1 F)
1973
37.2 C (99.0 F)
1974
36.7 C (98.1 F)
1975
37.8 C (100.0 F)
1976
37.8 C (100.0 F)
1977
35.6 C (96.1 F)
1978
36.1 C (97.0 F)
1979
37.2 C (99.0 F)
1980
40.0 C (104.0 F)
1981
36.7 C (98.1 F)
1982
35.0 C (95.0 F)
1983
37.2 C (99.0 F)
1984
36.7 C (98.1 F)
1985
37.2 C (99.0 F)
1986
36.7 C (98.1 F)
1987
35.0 C (95.0 F)
1988
37.8 C (100.0 F)
1989
36.7 C (98.1 F)
1990
37.8 C (100.0 F)
1991
36.1 C (97.0 F)
1992
38.3 C (100.9 F)
1993
36.7 C (98.1 F)
1994
37.8 C (100.0 F)
1995
36.1 C (97.0 F)
1996
37.2 C (99.0 F)
1997
36.7 C (98.1 F)
1998
38.3 C (100.9 F)
1999
36.1 C (97.0 F)
2000
36.7 C (98.1 F)
2001
37.2 C (99.0 F)
2002
40.0 C (104.0 F)
2003
38.9 C (102.0 F)
2004
36.7 C (98.1 F)
2005
38.3 C (100.9 F)
2006
41.7 C (107.1 F)
2007
37.2 C (99.0 F)
2008
36.7 C (98.1 F)
2009
37.2 C (99.0 F)
2010
36.1 C (97.0 F)
2011
35.0 C (95.0 F)
2012
37.2 C (99.0 F)
2013
38.9 C (102.0 F)
2014
13.3 C (55.9 F)
Coldest night (TNn)
The coldest night of the year at Deer Flat Dam, 1916 to 2014. The record is -32.8 C (-27.0 F) in 1957, marked on the chart; the median year is -16.1 C (3.0 F).
Coldest night (TNn) at Deer Flat Dam by year
Year
Coldest night (TNn)
1916
-17.8 C (0.0 F)
1917
-10.6 C (12.9 F)
1918
-7.2 C (19.0 F)
1919
-2.8 C (27.0 F)
1920
-9.4 C (15.1 F)
1921
-1.7 C (28.9 F)
1922
-5.6 C (21.9 F)
1923
-6.1 C (21.0 F)
1924
-3.9 C (25.0 F)
1925
-5.6 C (21.9 F)
1948
-20.0 C (-4.0 F)
1949
-22.2 C (-8.0 F)
1950
-25.6 C (-14.1 F)
1951
-18.9 C (-2.0 F)
1952
-19.4 C (-2.9 F)
1953
-8.9 C (16.0 F)
1954
-14.4 C (6.1 F)
1955
-19.4 C (-2.9 F)
1956
-20.6 C (-5.1 F)
1957
-32.8 C (-27.0 F)
1958
-13.3 C (8.1 F)
1959
-19.4 C (-2.9 F)
1960
-20.0 C (-4.0 F)
1961
-16.7 C (1.9 F)
1962
-30.0 C (-22.0 F)
1963
-23.3 C (-9.9 F)
1964
-18.9 C (-2.0 F)
1965
-12.8 C (9.0 F)
1966
-16.1 C (3.0 F)
1967
-16.1 C (3.0 F)
1968
-15.0 C (5.0 F)
1969
-14.4 C (6.1 F)
1970
-12.2 C (10.0 F)
1971
-15.6 C (3.9 F)
1972
-27.2 C (-17.0 F)
1973
-12.8 C (9.0 F)
1974
-21.1 C (-6.0 F)
1975
-18.9 C (-2.0 F)
1976
-14.4 C (6.1 F)
1977
-25.0 C (-13.0 F)
1978
-20.0 C (-4.0 F)
1979
-27.8 C (-18.0 F)
1980
-20.0 C (-4.0 F)
1981
-15.6 C (3.9 F)
1982
-18.3 C (-0.9 F)
1983
-24.4 C (-11.9 F)
1984
-25.6 C (-14.1 F)
1985
-27.8 C (-18.0 F)
1986
-21.1 C (-6.0 F)
1987
-15.0 C (5.0 F)
1988
-18.3 C (-0.9 F)
1989
-28.9 C (-20.0 F)
1990
-30.0 C (-22.0 F)
1991
-22.8 C (-9.0 F)
1992
-17.2 C (1.0 F)
1993
-17.8 C (0.0 F)
1994
-13.3 C (8.1 F)
1995
-14.4 C (6.1 F)
1996
-15.0 C (5.0 F)
1997
-11.7 C (10.9 F)
1998
-17.8 C (0.0 F)
1999
-8.3 C (17.1 F)
2000
-7.8 C (18.0 F)
2001
-15.0 C (5.0 F)
2002
-11.1 C (12.0 F)
2003
-8.9 C (16.0 F)
2004
-13.9 C (7.0 F)
2005
-12.8 C (9.0 F)
2006
-10.6 C (12.9 F)
2007
-12.8 C (9.0 F)
2008
-16.1 C (3.0 F)
2009
-20.0 C (-4.0 F)
2010
-13.3 C (8.1 F)
2011
-13.9 C (7.0 F)
2012
-11.7 C (10.9 F)
2013
-21.7 C (-7.1 F)
2014
-11.7 C (10.9 F)
Wettest day (Rx1day)
The wettest day of the year at Deer Flat Dam, 1916 to 2014. The record is 37.3 mm (1.5 in) in 1979, marked on the chart; the median year is 18.0 mm (0.7 in).
Wettest day (Rx1day) at Deer Flat Dam by year
Year
Wettest day (Rx1day)
1916
16.3 mm (0.6 in)
1917
13.0 mm (0.5 in)
1918
16.5 mm (0.6 in)
1919
5.1 mm (0.20 in)
1920
10.4 mm (0.4 in)
1921
26.7 mm (1.1 in)
1922
19.3 mm (0.8 in)
1923
20.8 mm (0.8 in)
1924
8.9 mm (0.35 in)
1925
16.5 mm (0.6 in)
1948
11.2 mm (0.4 in)
1949
17.8 mm (0.7 in)
1950
14.0 mm (0.6 in)
1951
17.3 mm (0.7 in)
1952
19.1 mm (0.8 in)
1953
26.2 mm (1.0 in)
1954
18.3 mm (0.7 in)
1955
24.1 mm (0.9 in)
1956
17.0 mm (0.7 in)
1957
16.5 mm (0.6 in)
1958
35.6 mm (1.4 in)
1959
34.8 mm (1.4 in)
1960
21.3 mm (0.8 in)
1961
14.0 mm (0.6 in)
1962
15.7 mm (0.6 in)
1963
21.3 mm (0.8 in)
1964
14.5 mm (0.6 in)
1965
18.0 mm (0.7 in)
1966
9.7 mm (0.38 in)
1967
28.4 mm (1.1 in)
1968
22.1 mm (0.9 in)
1969
23.1 mm (0.9 in)
1970
17.5 mm (0.7 in)
1971
22.9 mm (0.9 in)
1972
13.2 mm (0.5 in)
1973
28.7 mm (1.1 in)
1974
11.4 mm (0.4 in)
1975
24.9 mm (1.0 in)
1976
22.4 mm (0.9 in)
1977
21.1 mm (0.8 in)
1978
17.3 mm (0.7 in)
1979
37.3 mm (1.5 in)
1980
19.3 mm (0.8 in)
1981
24.4 mm (1.0 in)
1982
30.5 mm (1.2 in)
1983
14.7 mm (0.6 in)
1984
13.7 mm (0.5 in)
1985
11.9 mm (0.5 in)
1986
25.9 mm (1.0 in)
1987
27.4 mm (1.1 in)
1988
7.9 mm (0.31 in)
1989
12.7 mm (0.5 in)
1990
15.2 mm (0.6 in)
1991
25.9 mm (1.0 in)
1992
17.8 mm (0.7 in)
1993
23.6 mm (0.9 in)
1994
12.7 mm (0.5 in)
1995
20.1 mm (0.8 in)
1996
19.8 mm (0.8 in)
1997
15.2 mm (0.6 in)
1998
15.7 mm (0.6 in)
1999
11.9 mm (0.5 in)
2000
31.5 mm (1.2 in)
2001
15.5 mm (0.6 in)
2002
14.7 mm (0.6 in)
2003
17.8 mm (0.7 in)
2004
18.0 mm (0.7 in)
2005
23.9 mm (0.9 in)
2006
20.8 mm (0.8 in)
2007
34.3 mm (1.4 in)
2008
24.1 mm (0.9 in)
2009
15.5 mm (0.6 in)
2010
18.0 mm (0.7 in)
2011
22.9 mm (0.9 in)
2012
16.3 mm (0.6 in)
2013
22.4 mm (0.9 in)
2014
8.4 mm (0.33 in)
Wettest five days (Rx5day)
The wettest five days of the year at Deer Flat Dam, 1916 to 2014. The record is 57.0 mm (2.2 in) in 1921, marked on the chart; the median year is 28.7 mm (1.1 in).
Wettest five days (Rx5day) at Deer Flat Dam by year
Year
Wettest five days (Rx5day)
1916
27.5 mm (1.1 in)
1917
21.1 mm (0.8 in)
1918
22.4 mm (0.9 in)
1919
5.6 mm (0.22 in)
1920
20.0 mm (0.8 in)
1921
57.0 mm (2.2 in)
1922
24.1 mm (0.9 in)
1923
47.8 mm (1.9 in)
1924
13.7 mm (0.5 in)
1925
18.5 mm (0.7 in)
1948
20.3 mm (0.8 in)
1949
26.9 mm (1.1 in)
1950
27.9 mm (1.1 in)
1951
41.4 mm (1.6 in)
1952
21.1 mm (0.8 in)
1953
41.2 mm (1.6 in)
1954
22.9 mm (0.9 in)
1955
33.0 mm (1.3 in)
1956
25.7 mm (1.0 in)
1957
27.9 mm (1.1 in)
1958
56.2 mm (2.2 in)
1959
44.5 mm (1.8 in)
1960
30.2 mm (1.2 in)
1961
21.6 mm (0.9 in)
1962
37.6 mm (1.5 in)
1963
40.6 mm (1.6 in)
1964
24.5 mm (1.0 in)
1965
37.6 mm (1.5 in)
1966
18.0 mm (0.7 in)
1967
38.3 mm (1.5 in)
1968
37.6 mm (1.5 in)
1969
37.3 mm (1.5 in)
1970
39.8 mm (1.6 in)
1971
35.6 mm (1.4 in)
1972
18.8 mm (0.7 in)
1973
38.4 mm (1.5 in)
1974
21.9 mm (0.9 in)
1975
26.7 mm (1.1 in)
1976
27.8 mm (1.1 in)
1977
34.6 mm (1.4 in)
1978
33.3 mm (1.3 in)
1979
38.6 mm (1.5 in)
1980
47.7 mm (1.9 in)
1981
37.8 mm (1.5 in)
1982
38.9 mm (1.5 in)
1983
31.3 mm (1.2 in)
1984
22.1 mm (0.9 in)
1985
22.0 mm (0.9 in)
1986
33.3 mm (1.3 in)
1987
28.9 mm (1.1 in)
1988
18.0 mm (0.7 in)
1989
15.4 mm (0.6 in)
1990
30.2 mm (1.2 in)
1991
33.8 mm (1.3 in)
1992
27.9 mm (1.1 in)
1993
49.7 mm (2.0 in)
1994
19.3 mm (0.8 in)
1995
29.5 mm (1.2 in)
1996
38.7 mm (1.5 in)
1997
43.2 mm (1.7 in)
1998
41.2 mm (1.6 in)
1999
22.7 mm (0.9 in)
2000
33.5 mm (1.3 in)
2001
15.3 mm (0.6 in)
2002
20.1 mm (0.8 in)
2003
28.4 mm (1.1 in)
2004
28.8 mm (1.1 in)
2005
33.3 mm (1.3 in)
2006
17.6 mm (0.7 in)
2007
35.6 mm (1.4 in)
2008
26.1 mm (1.0 in)
2009
25.4 mm (1.0 in)
2010
21.8 mm (0.9 in)
2011
28.5 mm (1.1 in)
2012
28.7 mm (1.1 in)
2013
33.1 mm (1.3 in)
2014
14.3 mm (0.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Deer Flat Dam, 1916 to 2014. The record is 153 days in 1919, marked on the chart; the median year is 49 days.
Longest dry spell (CDD) at Deer Flat Dam by year
Year
Longest dry spell (CDD)
1916
44 days
1917
67 days
1918
17 days
1919
153 days
1920
56 days
1921
77 days
1922
75 days
1923
36 days
1924
68 days
1925
22 days
1948
25 days
1949
63 days
1950
58 days
1951
38 days
1952
109 days
1953
46 days
1954
65 days
1955
53 days
1956
62 days
1957
70 days
1958
74 days
1959
28 days
1960
45 days
1961
40 days
1962
62 days
1963
51 days
1964
43 days
1965
41 days
1966
81 days
1967
75 days
1968
53 days
1969
84 days
1970
49 days
1971
50 days
1972
60 days
1973
47 days
1974
63 days
1975
43 days
1976
36 days
1977
38 days
1978
75 days
1979
40 days
1980
45 days
1981
80 days
1982
38 days
1983
28 days
1984
43 days
1985
58 days
1986
93 days
1987
79 days
1988
43 days
1989
36 days
1990
52 days
1991
45 days
1992
46 days
1993
52 days
1994
90 days
1995
28 days
1996
38 days
1997
42 days
1998
38 days
1999
75 days
2000
44 days
2001
72 days
2002
46 days
2003
76 days
2004
32 days
2005
69 days
2006
43 days
2007
50 days
2008
42 days
2009
44 days
2010
53 days
2011
39 days
2012
46 days
2013
68 days
2014
19 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
50 years with a frost
Across 50 years with a frost, the median last spring frost at Deer Flat Dam falls on 30 April and the median first autumn frost on 12 October, which leaves a median of 162 days between them.
Fitted over all years, the growing season changes by +3.6 days per decade at this station.
Frost dates and growing season at Deer Flat Dam
Measure
Median, all years
Earliest period
Recent period (1969 to 2013)
Recent against earliest
Fitted trend
Last spring frost
30 April
n/a
26 April
n/a
-1.9 days per decade
First autumn frost
12 October
n/a
11 October
n/a
+1.7 days per decade
Growing days
162 days
n/a
168 days
n/a
+3.6 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
61 years, 1949 to 2013
A day with at least 18.7 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 40.2 mm (1.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Deer Flat Dam: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
18.7 mm (0.7 in)
5 years
24.5 mm (1.0 in)
10 years
28.3 mm (1.1 in)
25 years
33.1 mm (1.3 in)
50 years
36.7 mm (1.4 in)
100 years
40.2 mm (1.6 in)
Longer than the 61 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, 61 years of values from 1949 to 2013.
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: 37.3 mm (1.5 in) in 1979; 35.6 mm (1.4 in) in 1958; 34.8 mm (1.4 in) in 1959.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Deer Flat Dam, at 1983 and 1992. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1983 ran 0.3 C (0.6 F) lower than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1992 ran 0.7 C (1.2 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Deer Flat Dam, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1983
-0.3
-0.6
possible
5
1992
+0.7
+1.2
likely
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Deer Flat Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Deer Flat Dam 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.