Record envelope, standing records and threshold days for Brownlee Dam (USC00101180), Idaho, United States, with 52 years of record.
Key Facts for Brownlee Dam
Brownlee Dam (USC00101180) is a weather station in Idaho, United States at 44.84 latitude and -116.90 longitude, 562 m (1,844 ft) above sea level.
The station reports from 1966 to 2017, 52 years of record.
1,464 records set at Brownlee Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Brownlee Dam tied a daily record high minimum temperature of 6.7 C (44.1 F) on 24 November 2017.
About the Station
Location: Idaho, United States, 44.84 latitude, -116.90 longitude.
Elevation: 562 m (1,844 ft).
Period of record: 1966 to 2017, 52 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 Brownlee 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 Brownlee Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.3 C (64.9 F)
-25.0 C (-13.0 F)
n/a
n/a
Feb
20.6 C (69.1 F)
-25.0 C (-13.0 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-11.7 C (10.9 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-4.4 C (24.1 F)
n/a
n/a
May
39.4 C (102.9 F)
-0.6 C (30.9 F)
n/a
n/a
Jun
42.8 C (109.0 F)
2.2 C (36.0 F)
n/a
n/a
Jul
46.1 C (115.0 F)
2.8 C (37.0 F)
n/a
n/a
Aug
44.4 C (111.9 F)
5.6 C (42.1 F)
n/a
n/a
Sep
39.4 C (102.9 F)
1.7 C (35.1 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-5.0 C (23.0 F)
n/a
n/a
Nov
23.3 C (73.9 F)
-16.7 C (1.9 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-21.7 C (-7.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Brownlee Dam still stand. 1985 holds the most, with 60.
Standing records at Brownlee Dam by the year they were set
Year set
Standing records
1966
28
1967
32
1968
32
1969
33
1970
27
1971
35
1972
47
1973
21
1974
54
1975
40
1976
48
1977
41
1978
50
1979
57
1980
22
1981
24
1982
14
1983
40
1984
28
1985
60
1986
40
1987
29
1988
34
1989
38
1990
47
1991
19
1992
42
1993
35
1994
26
1995
37
1996
16
1997
12
1998
29
1999
20
2000
25
2001
13
2002
36
2003
47
2004
18
2005
17
2006
25
2007
18
2008
26
2009
14
2010
19
2011
16
2012
15
2016
16
2017
2
All-Time Record Progression
5 new records
5 all-time records were set at Brownlee Dam between 6 May 1998 and 14 July 2002. Each dot is a new record.
When Brownlee Dam set new all-time records
Date
Kind
Detail
1998-05-06
Record daily precipitation
Record daily precipitation 43.2 mm (1.7 in)
2000-08-04
Record high minimum temperature
Record high minimum temperature 26.7 C (80.1 F)
2002-07-12
Record high maximum temperature
Record high maximum temperature 45.6 C (114.1 F)
2002-07-13
Record high maximum temperature
Record high maximum temperature 46.1 C (115.0 F)
2002-07-14
Record high minimum temperature
Record high minimum temperature 27.2 C (81.0 F)
Wettest Day of Each Month
May: 43.2 mm (1.7 in)
The wettest day on record for each calendar month at Brownlee Dam. The most was 43.2 mm (1.7 in) on 6 May 1998.
Record daily precipitation for each month at Brownlee Dam
Month
Record daily precipitation (mm)
Date
Jan
30.5 mm (1.2 in)
10 January 1979
Feb
30.0 mm (1.2 in)
19 February 1968
Mar
23.9 mm (0.9 in)
16 March 1979
Apr
29.5 mm (1.2 in)
24 April 1983
May
43.2 mm (1.7 in)
6 May 1998
Jun
33.0 mm (1.3 in)
24 June 1969
Jul
27.4 mm (1.1 in)
13 July 1995
Aug
26.4 mm (1.0 in)
14 August 1979
Sep
32.0 mm (1.3 in)
13 September 1980
Oct
30.5 mm (1.2 in)
19 October 1979
Nov
26.9 mm (1.1 in)
22 November 2017
Dec
33.0 mm (1.3 in)
24 December 1980
Period of Record Coverage
1966 to 2017
Complete yearUnder 90 percent of days
49 years of record at Brownlee Dam, 1966 to 2017. 6 years have data for under 90 percent of days and are left out of rankings: 1966, 1995, 1996, 2012, 2016, 2017.
Cooler than the station meanWarmer than the station mean
One stripe for each of 39 complete years at Brownlee Dam, 1967 to 2010. Blue stripes are years cooler than the station's own mean of 12.4 C (54.4 F); red stripes are warmer. The coolest year was 1985, at 10.6 C (51.0 F), and the warmest was 2003, at 14.2 C (57.5 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Brownlee Dam as warming stripes, 1967 to 2010
Year
Annual mean temperature
Difference from the station mean
1967
13.1 C
+0.64 C
1968
12.5 C
+0.05 C
1969
12.8 C
+0.35 C
1970
12.4 C
0.00 C
1971
12.0 C
-0.40 C
1972
12.0 C
-0.39 C
1973
12.7 C
+0.24 C
1974
12.5 C
+0.02 C
1975
10.9 C
-1.52 C
1976
11.0 C
-1.46 C
1977
11.5 C
-0.94 C
1978
11.0 C
-1.39 C
1979
11.2 C
-1.28 C
1980
12.3 C
-0.16 C
1982
11.2 C
-1.25 C
1984
11.2 C
-1.22 C
1985
10.6 C
-1.85 C
1986
12.7 C
+0.28 C
1987
12.8 C
+0.35 C
1988
13.4 C
+0.95 C
1989
12.0 C
-0.41 C
1990
13.1 C
+0.63 C
1991
12.5 C
+0.10 C
1992
13.9 C
+1.51 C
1993
11.3 C
-1.11 C
1994
13.1 C
+0.69 C
1997
12.9 C
+0.49 C
1998
13.3 C
+0.90 C
1999
12.8 C
+0.35 C
2000
13.3 C
+0.88 C
2001
13.1 C
+0.65 C
2002
12.9 C
+0.49 C
2003
14.2 C
+1.76 C
2004
13.5 C
+1.02 C
2005
12.8 C
+0.35 C
2007
13.7 C
+1.22 C
2008
12.2 C
-0.22 C
2009
12.2 C
-0.21 C
2010
12.5 C
+0.08 C
The annual mean temperature here has risen by 0.3 C (0.1 to 0.5) per decade over 1967 to 2010. In Fahrenheit: 0.5 F (0.2 to 0.9) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Brownlee Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.1 to 0.5) per decade
0.5 F (0.2 to 0.9) per decade
1967 to 2010
39
Rise
Mean daily maximum
-0.01 C (-0.20 to 0.19) per decade
-0.01 F (-0.37 to 0.34) per decade
1967 to 2010
39
Not clearly different from zero
Mean daily minimum
0.6 C (0.3 to 0.9) per decade
1.1 F (0.6 to 1.5) per decade
1967 to 2010
39
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
1966 to 2017
Yearly extremes at Brownlee Dam: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
46.1 C (115.0 F)
2002
42.2 C (108.0 F)
49
Coldest night (TNn)
-25.0 C (-13.0 F)
1979
-12.8 C (9.0 F)
49
Wettest day (Rx1day)
43.2 mm (1.7 in)
1998
23.1 mm (0.9 in)
49
Wettest five days (Rx5day)
85.9 mm (3.4 in)
1968
43.5 mm (1.7 in)
49
Longest dry spell (CDD)
91 days
2012
40 days
49
Hottest day (TXx)
The hottest day of the year at Brownlee Dam, 1966 to 2017. The record is 46.1 C (115.0 F) in 2002, marked on the chart; the median year is 42.2 C (108.0 F).
Hottest day (TXx) at Brownlee Dam by year
Year
Hottest day (TXx)
1966
43.3 C (109.9 F)
1967
43.9 C (111.0 F)
1968
42.8 C (109.0 F)
1969
43.3 C (109.9 F)
1970
42.2 C (108.0 F)
1971
43.3 C (109.9 F)
1972
43.3 C (109.9 F)
1973
42.2 C (108.0 F)
1974
42.2 C (108.0 F)
1975
42.8 C (109.0 F)
1976
41.1 C (106.0 F)
1977
42.2 C (108.0 F)
1978
42.2 C (108.0 F)
1979
43.3 C (109.9 F)
1980
43.9 C (111.0 F)
1981
43.3 C (109.9 F)
1982
42.2 C (108.0 F)
1983
42.8 C (109.0 F)
1984
42.2 C (108.0 F)
1985
42.8 C (109.0 F)
1986
40.6 C (105.1 F)
1987
41.1 C (106.0 F)
1988
42.2 C (108.0 F)
1989
42.2 C (108.0 F)
1990
44.4 C (111.9 F)
1991
41.7 C (107.1 F)
1992
43.9 C (111.0 F)
1993
37.2 C (99.0 F)
1994
45.0 C (113.0 F)
1995
40.0 C (104.0 F)
1996
43.3 C (109.9 F)
1997
40.0 C (104.0 F)
1998
42.2 C (108.0 F)
1999
41.7 C (107.1 F)
2000
42.8 C (109.0 F)
2001
42.2 C (108.0 F)
2002
46.1 C (115.0 F)
2003
43.9 C (111.0 F)
2004
41.7 C (107.1 F)
2005
41.7 C (107.1 F)
2006
43.3 C (109.9 F)
2007
45.0 C (113.0 F)
2008
41.7 C (107.1 F)
2009
41.7 C (107.1 F)
2010
40.6 C (105.1 F)
2011
39.4 C (102.9 F)
2012
42.2 C (108.0 F)
2016
40.6 C (105.1 F)
2017
41.7 C (107.1 F)
Coldest night (TNn)
The coldest night of the year at Brownlee Dam, 1966 to 2017. The record is -25.0 C (-13.0 F) in 1979, marked on the chart; the median year is -12.8 C (9.0 F).
Coldest night (TNn) at Brownlee Dam by year
Year
Coldest night (TNn)
1966
-5.6 C (21.9 F)
1967
-12.8 C (9.0 F)
1968
-14.4 C (6.1 F)
1969
-14.4 C (6.1 F)
1970
-10.0 C (14.0 F)
1971
-12.8 C (9.0 F)
1972
-20.0 C (-4.0 F)
1973
-13.9 C (7.0 F)
1974
-18.9 C (-2.0 F)
1975
-12.2 C (10.0 F)
1976
-13.9 C (7.0 F)
1977
-15.6 C (3.9 F)
1978
-21.7 C (-7.1 F)
1979
-25.0 C (-13.0 F)
1980
-17.8 C (0.0 F)
1981
-10.0 C (14.0 F)
1982
-15.0 C (5.0 F)
1983
-21.1 C (-6.0 F)
1984
-17.8 C (0.0 F)
1985
-18.9 C (-2.0 F)
1986
-15.0 C (5.0 F)
1987
-11.1 C (12.0 F)
1988
-11.7 C (10.9 F)
1989
-22.8 C (-9.0 F)
1990
-21.1 C (-6.0 F)
1991
-14.4 C (6.1 F)
1992
-13.9 C (7.0 F)
1993
-13.3 C (8.1 F)
1994
-8.3 C (17.1 F)
1995
-12.2 C (10.0 F)
1996
-16.7 C (1.9 F)
1997
-10.0 C (14.0 F)
1998
-15.0 C (5.0 F)
1999
-7.8 C (18.0 F)
2000
-7.8 C (18.0 F)
2001
-7.2 C (19.0 F)
2002
-9.4 C (15.1 F)
2003
-9.4 C (15.1 F)
2004
-13.9 C (7.0 F)
2005
-10.0 C (14.0 F)
2006
-11.7 C (10.9 F)
2007
-12.2 C (10.0 F)
2008
-12.8 C (9.0 F)
2009
-15.0 C (5.0 F)
2010
-10.6 C (12.9 F)
2011
-11.1 C (12.0 F)
2012
-6.1 C (21.0 F)
2016
-5.6 C (21.9 F)
2017
-2.8 C (27.0 F)
Wettest day (Rx1day)
The wettest day of the year at Brownlee Dam, 1966 to 2017. The record is 43.2 mm (1.7 in) in 1998, marked on the chart; the median year is 23.1 mm (0.9 in).
Wettest day (Rx1day) at Brownlee Dam by year
Year
Wettest day (Rx1day)
1966
18.0 mm (0.7 in)
1967
28.7 mm (1.1 in)
1968
30.0 mm (1.2 in)
1969
33.0 mm (1.3 in)
1970
23.6 mm (0.9 in)
1971
23.1 mm (0.9 in)
1972
21.1 mm (0.8 in)
1973
21.6 mm (0.9 in)
1974
20.8 mm (0.8 in)
1975
21.3 mm (0.8 in)
1976
27.2 mm (1.1 in)
1977
31.8 mm (1.3 in)
1978
27.9 mm (1.1 in)
1979
30.5 mm (1.2 in)
1980
33.0 mm (1.3 in)
1981
35.6 mm (1.4 in)
1982
25.7 mm (1.0 in)
1983
29.5 mm (1.2 in)
1984
17.5 mm (0.7 in)
1985
30.0 mm (1.2 in)
1986
24.9 mm (1.0 in)
1987
21.1 mm (0.8 in)
1988
24.9 mm (1.0 in)
1989
23.1 mm (0.9 in)
1990
30.0 mm (1.2 in)
1991
21.3 mm (0.8 in)
1992
20.3 mm (0.8 in)
1993
26.9 mm (1.1 in)
1994
19.8 mm (0.8 in)
1995
30.5 mm (1.2 in)
1996
15.2 mm (0.6 in)
1997
20.3 mm (0.8 in)
1998
43.2 mm (1.7 in)
1999
24.9 mm (1.0 in)
2000
19.3 mm (0.8 in)
2001
14.0 mm (0.6 in)
2002
21.6 mm (0.9 in)
2003
23.1 mm (0.9 in)
2004
16.5 mm (0.6 in)
2005
22.9 mm (0.9 in)
2006
20.1 mm (0.8 in)
2007
25.7 mm (1.0 in)
2008
21.3 mm (0.8 in)
2009
21.6 mm (0.9 in)
2010
22.9 mm (0.9 in)
2011
16.8 mm (0.7 in)
2012
20.6 mm (0.8 in)
2016
19.1 mm (0.8 in)
2017
26.9 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Brownlee Dam, 1966 to 2017. The record is 85.9 mm (3.4 in) in 1968, marked on the chart; the median year is 43.5 mm (1.7 in).
Wettest five days (Rx5day) at Brownlee Dam by year
Year
Wettest five days (Rx5day)
1966
44.5 mm (1.8 in)
1967
52.6 mm (2.1 in)
1968
85.9 mm (3.4 in)
1969
38.9 mm (1.5 in)
1970
60.7 mm (2.4 in)
1971
36.4 mm (1.4 in)
1972
52.2 mm (2.1 in)
1973
44.8 mm (1.8 in)
1974
27.4 mm (1.1 in)
1975
33.8 mm (1.3 in)
1976
57.4 mm (2.3 in)
1977
55.7 mm (2.2 in)
1978
43.5 mm (1.7 in)
1979
44.5 mm (1.8 in)
1980
65.8 mm (2.6 in)
1981
53.8 mm (2.1 in)
1982
51.1 mm (2.0 in)
1983
46.3 mm (1.8 in)
1984
35.6 mm (1.4 in)
1985
51.4 mm (2.0 in)
1986
50.5 mm (2.0 in)
1987
34.3 mm (1.4 in)
1988
36.1 mm (1.4 in)
1989
39.5 mm (1.6 in)
1990
48.3 mm (1.9 in)
1991
47.5 mm (1.9 in)
1992
39.4 mm (1.6 in)
1993
59.6 mm (2.3 in)
1994
38.4 mm (1.5 in)
1995
62.7 mm (2.5 in)
1996
24.4 mm (1.0 in)
1997
47.2 mm (1.9 in)
1998
75.2 mm (3.0 in)
1999
61.8 mm (2.4 in)
2000
28.2 mm (1.1 in)
2001
24.1 mm (0.9 in)
2002
31.2 mm (1.2 in)
2003
42.7 mm (1.7 in)
2004
28.8 mm (1.1 in)
2005
47.8 mm (1.9 in)
2006
40.6 mm (1.6 in)
2007
41.7 mm (1.6 in)
2008
28.6 mm (1.1 in)
2009
29.8 mm (1.2 in)
2010
60.0 mm (2.4 in)
2011
39.1 mm (1.5 in)
2012
35.7 mm (1.4 in)
2016
22.9 mm (0.9 in)
2017
30.7 mm (1.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Brownlee Dam, 1966 to 2017. The record is 91 days in 2012, marked on the chart; the median year is 40 days.
Longest dry spell (CDD) at Brownlee Dam by year
Year
Longest dry spell (CDD)
1966
74 days
1967
80 days
1968
41 days
1969
75 days
1970
48 days
1971
37 days
1972
31 days
1973
34 days
1974
69 days
1975
38 days
1976
53 days
1977
40 days
1978
57 days
1979
53 days
1980
35 days
1981
79 days
1982
33 days
1983
32 days
1984
34 days
1985
33 days
1986
34 days
1987
66 days
1988
37 days
1989
53 days
1990
49 days
1991
75 days
1992
30 days
1993
45 days
1994
84 days
1995
21 days
1996
26 days
1997
20 days
1998
39 days
1999
73 days
2000
71 days
2001
38 days
2002
42 days
2003
36 days
2004
24 days
2005
52 days
2006
59 days
2007
36 days
2008
40 days
2009
46 days
2010
40 days
2011
60 days
2012
91 days
2016
20 days
2017
28 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
39 years with a frost
Across 39 years with a frost, the median last spring frost at Brownlee Dam falls on 8 April and the median first autumn frost on 2 November, which leaves a median of 209 days between them.
Fitted over all years, the growing season changes by +12.3 days per decade at this station.
Frost dates and growing season at Brownlee Dam
Measure
Median, all years
Earliest period
Recent period (1976 to 2010)
Recent against earliest
Fitted trend
Last spring frost
8 April
n/a
6 April
n/a
-7.3 days per decade
First autumn frost
2 November
n/a
3 November
n/a
+5.0 days per decade
Growing days
209 days
n/a
217 days
n/a
+12.3 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
43 years, 1967 to 2010
A day with at least 24.0 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 42.5 mm (1.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Brownlee 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
24.0 mm (0.9 in)
5 years
29.1 mm (1.1 in)
10 years
32.4 mm (1.3 in)
25 years
36.5 mm (1.4 in)
50 years
39.6 mm (1.6 in)
Longer than the 43 years of record
100 years
42.5 mm (1.7 in)
Longer than the 43 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, 43 years of values from 1967 to 2010.
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: 43.2 mm (1.7 in) in 1998; 35.6 mm (1.4 in) in 1981; 33.0 mm (1.3 in) in 1969.
Download the Data
Data for Brownlee Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Brownlee 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.