Record envelope, standing records and threshold days for Olney (USC00246218), Montana, United States, with 56 years of record.
Key Facts for Olney
Olney (USC00246218) is a weather station in Montana, United States at 48.55 latitude and -114.57 longitude, 965 m (3,165 ft) above sea level.
The station reports from 1962 to 2017, 56 years of record.
1,464 records set at Olney still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Olney set a daily record low maximum temperature of 7.8 C (46.0 F) on 17 May 2017.
About the Station
Location: Montana, United States, 48.55 latitude, -114.57 longitude.
Elevation: 965 m (3,165 ft).
Period of record: 1962 to 2017, 56 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 Olney. 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 Olney, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
9.4 C (48.9 F)
-37.2 C (-35.0 F)
n/a
n/a
Feb
16.7 C (62.1 F)
-40.0 C (-40.0 F)
n/a
n/a
Mar
21.1 C (70.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Apr
30.0 C (86.0 F)
-18.3 C (-0.9 F)
n/a
n/a
May
33.9 C (93.0 F)
-8.9 C (16.0 F)
n/a
n/a
Jun
36.7 C (98.1 F)
-4.4 C (24.1 F)
n/a
n/a
Jul
38.3 C (100.9 F)
-2.2 C (28.0 F)
n/a
n/a
Aug
37.8 C (100.0 F)
-3.3 C (26.1 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-11.1 C (12.0 F)
n/a
n/a
Oct
26.7 C (80.1 F)
-23.3 C (-9.9 F)
n/a
n/a
Nov
18.3 C (64.9 F)
-31.7 C (-25.1 F)
n/a
n/a
Dec
11.1 C (52.0 F)
-42.2 C (-44.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Olney still stand. 1985 holds the most, with 61.
Standing records at Olney by the year they were set
Year set
Standing records
1962
11
1963
37
1964
27
1965
20
1966
46
1967
55
1968
41
1969
37
1970
27
1971
27
1972
46
1973
34
1974
33
1975
33
1976
16
1977
18
1978
16
1980
28
1981
27
1982
23
1983
39
1984
33
1985
61
1986
36
1987
26
1988
27
1989
24
1990
28
1991
28
1992
33
1993
34
1994
25
1995
29
1996
37
1997
27
1998
16
1999
22
2000
16
2001
20
2002
42
2003
25
2004
15
2005
20
2006
17
2007
13
2008
23
2009
26
2010
11
2011
23
2012
18
2013
14
2014
28
2015
12
2016
13
2017
1
Wettest Day of Each Month
Jun: 51.3 mm (2.0 in)
The wettest day on record for each calendar month at Olney. The most was 51.3 mm (2.0 in) on 22 June 1967.
Record daily precipitation for each month at Olney
Month
Record daily precipitation (mm)
Date
Jan
41.7 mm (1.6 in)
25 January 1964
Feb
44.2 mm (1.7 in)
13 February 1982
Mar
20.3 mm (0.8 in)
14 March 2017
Apr
40.6 mm (1.6 in)
25 April 1983
May
45.2 mm (1.8 in)
27 May 1998
Jun
51.3 mm (2.0 in)
22 June 1967
Jul
48.3 mm (1.9 in)
22 July 1987
Aug
45.7 mm (1.8 in)
2 August 2013
Sep
36.8 mm (1.4 in)
9 September 2003
Oct
21.1 mm (0.8 in)
27 October 1994
Nov
44.5 mm (1.8 in)
11 November 1989
Dec
31.5 mm (1.2 in)
4 December 1989
Period of Record Coverage
1962 to 2017
Complete yearUnder 90 percent of days
55 years of record at Olney, 1962 to 2017. 10 years have data for under 90 percent of days and are left out of rankings: 1962, 1963, 1965, 1977, 1978, 1980, 1984, 1996 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 38 complete years at Olney, 1964 to 2016. Blue stripes are years cooler than the station's own mean of 4.8 C (40.7 F); red stripes are warmer. The coolest year was 2009, at 3.4 C (38.0 F), and the warmest was 1981, at 6.0 C (42.9 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Olney as warming stripes, 1964 to 2016
Year
Annual mean temperature
Difference from the station mean
1964
4.3 C
-0.55 C
1966
5.4 C
+0.56 C
1967
5.9 C
+1.06 C
1968
4.9 C
+0.04 C
1969
4.8 C
-0.05 C
1970
4.8 C
-0.02 C
1971
4.6 C
-0.21 C
1972
4.4 C
-0.44 C
1975
4.2 C
-0.63 C
1981
6.0 C
+1.22 C
1982
4.6 C
-0.26 C
1983
5.9 C
+1.06 C
1985
4.2 C
-0.59 C
1986
5.6 C
+0.80 C
1987
5.8 C
+1.01 C
1988
5.9 C
+1.06 C
1989
4.9 C
+0.10 C
1990
5.2 C
+0.40 C
1991
5.2 C
+0.34 C
1993
4.2 C
-0.64 C
1994
5.7 C
+0.92 C
1995
5.1 C
+0.31 C
1997
4.2 C
-0.67 C
1998
5.7 C
+0.88 C
1999
4.7 C
-0.12 C
2000
4.1 C
-0.73 C
2002
3.9 C
-0.88 C
2003
4.7 C
-0.14 C
2004
5.0 C
+0.21 C
2006
4.8 C
0.00 C
2007
4.6 C
-0.22 C
2009
3.4 C
-1.46 C
2010
4.3 C
-0.49 C
2011
3.7 C
-1.14 C
2012
4.8 C
+0.02 C
2013
4.5 C
-0.31 C
2014
4.0 C
-0.78 C
2016
5.3 C
+0.49 C
The fitted trend in annual mean temperature here over 1964 to 2016 is -0.12 C (-0.26 to 0.02) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.22 F (-0.48 to 0.03) per decade. The slope is a straight line fitted to 38 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Olney
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.12 C (-0.26 to 0.02) per decade
-0.22 F (-0.48 to 0.03) per decade
1964 to 2016
38
Not clearly different from zero
Mean daily maximum
-0.22 C (-0.40 to -0.04) per decade
-0.4 F (-0.7 to -0.1) per decade
1964 to 2016
38
Fall
Mean daily minimum
-0.03 C (-0.17 to 0.12) per decade
-0.05 F (-0.30 to 0.21) per decade
1964 to 2016
38
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
1962 to 2017
Yearly extremes at Olney: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.3 C (100.9 F)
1985
34.4 C (93.9 F)
55
Coldest night (TNn)
-42.2 C (-44.0 F)
1990
-31.7 C (-25.1 F)
55
Wettest day (Rx1day)
51.3 mm (2.0 in)
1967
29.2 mm (1.1 in)
55
Wettest five days (Rx5day)
95.9 mm (3.8 in)
1995
53.8 mm (2.1 in)
55
Longest dry spell (CDD)
75 days
1967
25 days
55
Hottest day (TXx)
The hottest day of the year at Olney, 1962 to 2017. The record is 38.3 C (100.9 F) in 1985, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Olney by year
Year
Hottest day (TXx)
1962
35.0 C (95.0 F)
1963
33.9 C (93.0 F)
1964
33.3 C (91.9 F)
1965
35.0 C (95.0 F)
1966
35.0 C (95.0 F)
1967
37.8 C (100.0 F)
1968
33.9 C (93.0 F)
1969
36.1 C (97.0 F)
1970
33.3 C (91.9 F)
1971
34.4 C (93.9 F)
1972
33.3 C (91.9 F)
1973
37.2 C (99.0 F)
1974
35.6 C (96.1 F)
1975
36.7 C (98.1 F)
1976
32.2 C (90.0 F)
1977
34.4 C (93.9 F)
1978
33.3 C (91.9 F)
1980
32.2 C (90.0 F)
1981
35.0 C (95.0 F)
1982
37.2 C (99.0 F)
1983
36.7 C (98.1 F)
1984
35.0 C (95.0 F)
1985
38.3 C (100.9 F)
1986
33.9 C (93.0 F)
1987
34.4 C (93.9 F)
1988
34.4 C (93.9 F)
1989
35.0 C (95.0 F)
1990
34.4 C (93.9 F)
1991
35.0 C (95.0 F)
1992
35.0 C (95.0 F)
1993
32.2 C (90.0 F)
1994
36.7 C (98.1 F)
1995
31.7 C (89.1 F)
1996
37.2 C (99.0 F)
1997
32.8 C (91.0 F)
1998
33.9 C (93.0 F)
1999
33.3 C (91.9 F)
2000
35.0 C (95.0 F)
2001
34.4 C (93.9 F)
2002
36.7 C (98.1 F)
2003
36.7 C (98.1 F)
2004
33.9 C (93.0 F)
2005
33.9 C (93.0 F)
2006
35.6 C (96.1 F)
2007
37.8 C (100.0 F)
2008
36.1 C (97.0 F)
2009
32.2 C (90.0 F)
2010
31.7 C (89.1 F)
2011
32.8 C (91.0 F)
2012
34.4 C (93.9 F)
2013
33.9 C (93.0 F)
2014
34.4 C (93.9 F)
2015
36.7 C (98.1 F)
2016
32.8 C (91.0 F)
2017
28.3 C (82.9 F)
Coldest night (TNn)
The coldest night of the year at Olney, 1962 to 2017. The record is -42.2 C (-44.0 F) in 1990, marked on the chart; the median year is -31.7 C (-25.1 F).
Coldest night (TNn) at Olney by year
Year
Coldest night (TNn)
1962
-14.4 C (6.1 F)
1963
-35.6 C (-32.1 F)
1964
-40.0 C (-40.0 F)
1965
-17.2 C (1.0 F)
1966
-32.2 C (-26.0 F)
1967
-25.6 C (-14.1 F)
1968
-38.9 C (-38.0 F)
1969
-28.9 C (-20.0 F)
1970
-30.0 C (-22.0 F)
1971
-27.8 C (-18.0 F)
1972
-35.6 C (-32.1 F)
1973
-32.2 C (-26.0 F)
1974
-33.3 C (-27.9 F)
1975
-30.0 C (-22.0 F)
1976
-31.1 C (-24.0 F)
1977
-28.3 C (-18.9 F)
1978
-37.8 C (-36.0 F)
1980
-22.2 C (-8.0 F)
1981
-36.7 C (-34.1 F)
1982
-35.6 C (-32.1 F)
1983
-40.0 C (-40.0 F)
1984
-31.7 C (-25.1 F)
1985
-34.4 C (-29.9 F)
1986
-27.8 C (-18.0 F)
1987
-28.3 C (-18.9 F)
1988
-30.0 C (-22.0 F)
1989
-40.0 C (-40.0 F)
1990
-42.2 C (-44.0 F)
1991
-28.9 C (-20.0 F)
1992
-22.8 C (-9.0 F)
1993
-34.4 C (-29.9 F)
1994
-36.7 C (-34.1 F)
1995
-30.6 C (-23.1 F)
1996
-37.8 C (-36.0 F)
1997
-32.2 C (-26.0 F)
1998
-36.1 C (-33.0 F)
1999
-27.2 C (-17.0 F)
2000
-25.0 C (-13.0 F)
2001
-28.3 C (-18.9 F)
2002
-25.0 C (-13.0 F)
2003
-28.3 C (-18.9 F)
2004
-36.7 C (-34.1 F)
2005
-32.8 C (-27.0 F)
2006
-35.6 C (-32.1 F)
2007
-32.8 C (-27.0 F)
2008
-33.3 C (-27.9 F)
2009
-29.4 C (-20.9 F)
2010
-30.0 C (-22.0 F)
2011
-31.7 C (-25.1 F)
2012
-20.0 C (-4.0 F)
2013
-35.0 C (-31.0 F)
2014
-36.7 C (-34.1 F)
2015
-25.0 C (-13.0 F)
2016
-32.2 C (-26.0 F)
2017
-31.1 C (-24.0 F)
Wettest day (Rx1day)
The wettest day of the year at Olney, 1962 to 2017. The record is 51.3 mm (2.0 in) in 1967, marked on the chart; the median year is 29.2 mm (1.1 in).
Wettest day (Rx1day) at Olney by year
Year
Wettest day (Rx1day)
1962
12.7 mm (0.5 in)
1963
36.3 mm (1.4 in)
1964
41.7 mm (1.6 in)
1965
26.4 mm (1.0 in)
1966
39.9 mm (1.6 in)
1967
51.3 mm (2.0 in)
1968
27.4 mm (1.1 in)
1969
25.9 mm (1.0 in)
1970
27.2 mm (1.1 in)
1971
29.2 mm (1.1 in)
1972
27.9 mm (1.1 in)
1973
31.0 mm (1.2 in)
1974
38.1 mm (1.5 in)
1975
20.3 mm (0.8 in)
1976
30.5 mm (1.2 in)
1977
13.2 mm (0.5 in)
1978
27.7 mm (1.1 in)
1980
32.3 mm (1.3 in)
1981
34.3 mm (1.4 in)
1982
44.2 mm (1.7 in)
1983
40.6 mm (1.6 in)
1984
38.1 mm (1.5 in)
1985
29.2 mm (1.1 in)
1986
38.1 mm (1.5 in)
1987
48.3 mm (1.9 in)
1988
20.3 mm (0.8 in)
1989
44.5 mm (1.8 in)
1990
37.1 mm (1.5 in)
1991
25.4 mm (1.0 in)
1992
23.6 mm (0.9 in)
1993
40.4 mm (1.6 in)
1994
40.6 mm (1.6 in)
1995
44.5 mm (1.8 in)
1996
33.0 mm (1.3 in)
1997
31.8 mm (1.3 in)
1998
45.2 mm (1.8 in)
1999
22.1 mm (0.9 in)
2000
20.3 mm (0.8 in)
2001
19.1 mm (0.8 in)
2002
25.4 mm (1.0 in)
2003
36.8 mm (1.4 in)
2004
23.6 mm (0.9 in)
2005
30.5 mm (1.2 in)
2006
33.0 mm (1.3 in)
2007
21.8 mm (0.9 in)
2008
20.6 mm (0.8 in)
2009
29.2 mm (1.1 in)
2010
22.1 mm (0.9 in)
2011
29.2 mm (1.1 in)
2012
24.1 mm (0.9 in)
2013
45.7 mm (1.8 in)
2014
24.1 mm (0.9 in)
2015
27.9 mm (1.1 in)
2016
38.1 mm (1.5 in)
2017
20.3 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Olney, 1962 to 2017. The record is 95.9 mm (3.8 in) in 1995, marked on the chart; the median year is 53.8 mm (2.1 in).
Wettest five days (Rx5day) at Olney by year
Year
Wettest five days (Rx5day)
1962
31.4 mm (1.2 in)
1963
48.3 mm (1.9 in)
1964
62.3 mm (2.5 in)
1965
37.3 mm (1.5 in)
1966
90.2 mm (3.6 in)
1967
53.8 mm (2.1 in)
1968
53.6 mm (2.1 in)
1969
83.6 mm (3.3 in)
1970
50.8 mm (2.0 in)
1971
45.7 mm (1.8 in)
1972
51.3 mm (2.0 in)
1973
47.1 mm (1.9 in)
1974
86.6 mm (3.4 in)
1975
45.4 mm (1.8 in)
1976
43.7 mm (1.7 in)
1977
32.0 mm (1.3 in)
1978
32.3 mm (1.3 in)
1980
71.6 mm (2.8 in)
1981
48.6 mm (1.9 in)
1982
81.8 mm (3.2 in)
1983
62.5 mm (2.5 in)
1984
48.5 mm (1.9 in)
1985
54.4 mm (2.1 in)
1986
67.3 mm (2.6 in)
1987
94.0 mm (3.7 in)
1988
59.2 mm (2.3 in)
1989
82.1 mm (3.2 in)
1990
54.8 mm (2.2 in)
1991
34.5 mm (1.4 in)
1992
42.7 mm (1.7 in)
1993
74.9 mm (2.9 in)
1994
52.1 mm (2.1 in)
1995
95.9 mm (3.8 in)
1996
61.7 mm (2.4 in)
1997
71.1 mm (2.8 in)
1998
78.6 mm (3.1 in)
1999
49.4 mm (1.9 in)
2000
42.8 mm (1.7 in)
2001
35.7 mm (1.4 in)
2002
41.9 mm (1.6 in)
2003
43.4 mm (1.7 in)
2004
54.8 mm (2.2 in)
2005
60.5 mm (2.4 in)
2006
54.9 mm (2.2 in)
2007
39.9 mm (1.6 in)
2008
46.5 mm (1.8 in)
2009
47.3 mm (1.9 in)
2010
58.4 mm (2.3 in)
2011
39.9 mm (1.6 in)
2012
60.7 mm (2.4 in)
2013
58.9 mm (2.3 in)
2014
87.1 mm (3.4 in)
2015
58.9 mm (2.3 in)
2016
83.7 mm (3.3 in)
2017
47.0 mm (1.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Olney, 1962 to 2017. The record is 75 days in 1967, marked on the chart; the median year is 25 days.
Longest dry spell (CDD) at Olney by year
Year
Longest dry spell (CDD)
1962
23 days
1963
22 days
1964
15 days
1965
21 days
1966
25 days
1967
75 days
1968
20 days
1969
67 days
1970
32 days
1971
25 days
1972
24 days
1973
35 days
1974
31 days
1975
15 days
1976
19 days
1977
34 days
1978
50 days
1980
17 days
1981
22 days
1982
18 days
1983
20 days
1984
23 days
1985
39 days
1986
36 days
1987
31 days
1988
58 days
1989
25 days
1990
19 days
1991
30 days
1992
29 days
1993
20 days
1994
27 days
1995
25 days
1996
25 days
1997
22 days
1998
19 days
1999
21 days
2000
31 days
2001
36 days
2002
18 days
2003
24 days
2004
25 days
2005
31 days
2006
32 days
2007
28 days
2008
30 days
2009
43 days
2010
14 days
2011
25 days
2012
20 days
2013
32 days
2014
20 days
2015
12 days
2016
22 days
2017
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
38 years with a frost
Across 38 years with a frost, the median last spring frost at Olney falls on 20 June and the median first autumn frost on 29 July, which leaves a median of 41 days between them.
Fitted over all years, the growing season changes by +6.1 days per decade at this station.
Frost dates and growing season at Olney
Measure
Median, all years
Earliest period
Recent period (1975 to 2016)
Recent against earliest
Fitted trend
Last spring frost
20 June
n/a
19 June
n/a
-1.0 days per decade
First autumn frost
29 July
n/a
12 August
n/a
+5.0 days per decade
Growing days
41 days
n/a
55 days
n/a
+6.1 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, 1963 to 2016
A day with at least 31.6 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 56.1 mm (2.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Olney: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
31.6 mm (1.2 in)
5 years
39.7 mm (1.6 in)
10 years
44.4 mm (1.7 in)
25 years
49.6 mm (2.0 in)
50 years
53.0 mm (2.1 in)
Longer than the 47 years of record
100 years
56.1 mm (2.2 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 1963 to 2016.
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: 51.3 mm (2.0 in) in 1967; 48.3 mm (1.9 in) in 1987; 45.7 mm (1.8 in) in 2013.
Download the Data
Data for Olney standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Olney 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.