Record envelope, standing records and threshold days for Iliad (USC00244368), Montana, United States, with 52 years of record.
Key Facts for Iliad
Iliad (USC00244368) is a weather station in Montana, United States at 47.81 latitude and -109.81 longitude, 904 m (2,965 ft) above sea level.
The station reports from 1950 to 2001, 52 years of record.
1,464 records set at Iliad still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Iliad set a daily record precipitation of 21.1 mm (0.8 in) on 22 July 2001.
About the Station
Location: Montana, United States, 47.81 latitude, -109.81 longitude.
Elevation: 904 m (2,965 ft).
Period of record: 1950 to 2001, 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 Iliad. 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 Iliad, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.0 C (68.0 F)
-44.4 C (-47.9 F)
n/a
n/a
Feb
23.3 C (73.9 F)
-38.3 C (-36.9 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-33.3 C (-27.9 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-18.9 C (-2.0 F)
n/a
n/a
May
36.1 C (97.0 F)
-5.6 C (21.9 F)
n/a
n/a
Jun
38.9 C (102.0 F)
-4.4 C (24.1 F)
n/a
n/a
Jul
41.7 C (107.1 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
44.4 C (111.9 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-9.4 C (15.1 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Nov
26.1 C (79.0 F)
-35.0 C (-31.0 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-41.7 C (-43.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Iliad still stand. 1969 holds the most, with 60.
Standing records at Iliad by the year they were set
Year set
Standing records
1959
22
1960
41
1961
59
1962
45
1963
53
1964
36
1965
47
1966
42
1967
51
1968
41
1969
60
1970
26
1971
33
1972
44
1973
20
1974
20
1975
19
1976
30
1977
22
1978
13
1979
32
1980
42
1981
25
1982
36
1983
32
1984
30
1985
54
1986
38
1987
43
1988
30
1989
21
1990
31
1991
37
1992
50
1993
32
1994
23
1995
29
1996
41
1997
30
1998
26
1999
28
2000
19
2001
11
All-Time Record Progression
2 new records
2 all-time records were set at Iliad between 1 January 1999 and 8 January 1999. Each dot is a new record.
When Iliad set new all-time records
Date
Kind
Detail
1999-01-01
Record snow depth
Record snow depth 20.3 cm (8.0 in)
1999-01-08
Record snow depth
Record snow depth 22.9 cm (9.0 in)
Wettest Day of Each Month
Jun: 76.2 mm (3.0 in)
The wettest day on record for each calendar month at Iliad. The most was 76.2 mm (3.0 in) on 20 June 1974.
Record daily precipitation for each month at Iliad
Month
Record daily precipitation (mm)
Date
Jan
19.8 mm (0.8 in)
3 January 1996
Feb
20.3 mm (0.8 in)
22 February 1982
Mar
20.1 mm (0.8 in)
27 March 1993
Apr
48.3 mm (1.9 in)
28 April 1991
May
58.9 mm (2.3 in)
26 May 1997
Jun
76.2 mm (3.0 in)
20 June 1974
Jul
60.2 mm (2.4 in)
10 July 1983
Aug
51.3 mm (2.0 in)
15 August 1968
Sep
40.6 mm (1.6 in)
18 September 1988
Oct
30.0 mm (1.2 in)
3 October 1967
Nov
25.4 mm (1.0 in)
14 November 1959
Dec
17.8 mm (0.7 in)
16 December 1977
Period of Record Coverage
1959 to 2001
Complete yearUnder 90 percent of days
43 years of record at Iliad, 1959 to 2001. 14 years have data for under 90 percent of days and are left out of rankings: 1959, 1969, 1970, 1971, 1972, 1973, 1974, 1975 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 29 complete years at Iliad, 1960 to 1999. Blue stripes are years cooler than the station's own mean of 6.8 C (44.2 F); red stripes are warmer. The coolest year was 1996, at 4.6 C (40.2 F), and the warmest was 1987, at 8.4 C (47.1 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Iliad as warming stripes, 1960 to 1999
Year
Annual mean temperature
Difference from the station mean
1960
6.5 C
-0.31 C
1961
7.7 C
+0.91 C
1962
7.0 C
+0.21 C
1963
7.9 C
+1.07 C
1964
6.0 C
-0.81 C
1966
6.2 C
-0.63 C
1967
6.8 C
-0.03 C
1968
6.5 C
-0.25 C
1969
5.3 C
-1.54 C
1980
7.1 C
+0.33 C
1981
8.0 C
+1.22 C
1982
4.8 C
-2.02 C
1983
6.7 C
-0.11 C
1984
6.8 C
+0.01 C
1985
5.1 C
-1.67 C
1986
7.4 C
+0.61 C
1987
8.4 C
+1.62 C
1988
8.2 C
+1.36 C
1989
5.9 C
-0.93 C
1990
7.4 C
+0.61 C
1991
7.4 C
+0.58 C
1992
7.7 C
+0.92 C
1993
5.4 C
-1.35 C
1994
7.0 C
+0.23 C
1995
6.2 C
-0.57 C
1996
4.6 C
-2.24 C
1997
6.9 C
+0.11 C
1998
8.1 C
+1.27 C
1999
8.3 C
+1.54 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
1950 to 2001
Yearly extremes at Iliad: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
44.4 C (111.9 F)
1961
38.3 C (100.9 F)
43
Coldest night (TNn)
-44.4 C (-47.9 F)
1969
-34.4 C (-29.9 F)
43
Wettest day (Rx1day)
76.2 mm (3.0 in)
1974
30.3 mm (1.2 in)
46
Wettest five days (Rx5day)
139.2 mm (5.5 in)
1993
48.3 mm (1.9 in)
45
Longest dry spell (CDD)
66 days
1984
33 days
46
Hottest day (TXx)
The hottest day of the year at Iliad, 1950 to 2001. The record is 44.4 C (111.9 F) in 1961, marked on the chart; the median year is 38.3 C (100.9 F).
Hottest day (TXx) at Iliad by year
Year
Hottest day (TXx)
1950
n/a
1951
n/a
1955
n/a
1959
34.4 C (93.9 F)
1960
41.1 C (106.0 F)
1961
44.4 C (111.9 F)
1962
37.2 C (99.0 F)
1963
41.7 C (107.1 F)
1964
39.4 C (102.9 F)
1965
38.3 C (100.9 F)
1966
38.3 C (100.9 F)
1967
38.9 C (102.0 F)
1968
37.8 C (100.0 F)
1969
42.2 C (108.0 F)
1970
41.1 C (106.0 F)
1971
40.0 C (104.0 F)
1972
36.1 C (97.0 F)
1973
39.4 C (102.9 F)
1974
37.2 C (99.0 F)
1975
39.4 C (102.9 F)
1976
38.9 C (102.0 F)
1977
37.2 C (99.0 F)
1978
37.8 C (100.0 F)
1979
38.3 C (100.9 F)
1980
37.2 C (99.0 F)
1981
38.3 C (100.9 F)
1982
35.6 C (96.1 F)
1983
40.6 C (105.1 F)
1984
38.3 C (100.9 F)
1985
38.3 C (100.9 F)
1986
36.1 C (97.0 F)
1987
36.7 C (98.1 F)
1988
38.9 C (102.0 F)
1989
36.1 C (97.0 F)
1990
38.3 C (100.9 F)
1991
38.9 C (102.0 F)
1992
38.3 C (100.9 F)
1993
34.4 C (93.9 F)
1994
37.2 C (99.0 F)
1995
36.7 C (98.1 F)
1996
36.7 C (98.1 F)
1997
37.2 C (99.0 F)
1998
37.8 C (100.0 F)
1999
38.9 C (102.0 F)
2000
37.8 C (100.0 F)
2001
36.7 C (98.1 F)
Coldest night (TNn)
The coldest night of the year at Iliad, 1950 to 2001. The record is -44.4 C (-47.9 F) in 1969, marked on the chart; the median year is -34.4 C (-29.9 F).
Coldest night (TNn) at Iliad by year
Year
Coldest night (TNn)
1950
n/a
1951
n/a
1955
n/a
1959
-35.0 C (-31.0 F)
1960
-33.3 C (-27.9 F)
1961
-34.4 C (-29.9 F)
1962
-37.2 C (-35.0 F)
1963
-37.2 C (-35.0 F)
1964
-39.4 C (-38.9 F)
1965
-30.6 C (-23.1 F)
1966
-34.4 C (-29.9 F)
1967
-35.0 C (-31.0 F)
1968
-39.4 C (-38.9 F)
1969
-44.4 C (-47.9 F)
1970
-32.8 C (-27.0 F)
1971
-35.6 C (-32.1 F)
1972
-41.1 C (-42.0 F)
1973
-28.9 C (-20.0 F)
1974
-38.3 C (-36.9 F)
1975
-28.9 C (-20.0 F)
1976
-30.0 C (-22.0 F)
1977
-38.3 C (-36.9 F)
1978
-35.6 C (-32.1 F)
1979
-38.9 C (-38.0 F)
1980
-30.6 C (-23.1 F)
1981
-29.4 C (-20.9 F)
1982
-36.1 C (-33.0 F)
1983
-41.7 C (-43.1 F)
1984
-29.4 C (-20.9 F)
1985
-34.4 C (-29.9 F)
1986
-26.7 C (-16.1 F)
1987
-26.1 C (-15.0 F)
1988
-27.2 C (-17.0 F)
1989
-37.2 C (-35.0 F)
1990
-35.6 C (-32.1 F)
1991
-31.1 C (-24.0 F)
1992
-31.7 C (-25.1 F)
1993
-30.0 C (-22.0 F)
1994
-38.3 C (-36.9 F)
1995
-28.3 C (-18.9 F)
1996
-40.0 C (-40.0 F)
1997
-35.6 C (-32.1 F)
1998
-34.4 C (-29.9 F)
1999
-23.9 C (-11.0 F)
2000
-30.6 C (-23.1 F)
2001
-23.9 C (-11.0 F)
Wettest day (Rx1day)
The wettest day of the year at Iliad, 1950 to 2001. The record is 76.2 mm (3.0 in) in 1974, marked on the chart; the median year is 30.3 mm (1.2 in).
Wettest day (Rx1day) at Iliad by year
Year
Wettest day (Rx1day)
1950
41.9 mm (1.6 in)
1951
20.3 mm (0.8 in)
1955
0.0 mm (0.00 in)
1959
25.4 mm (1.0 in)
1960
26.4 mm (1.0 in)
1961
54.6 mm (2.1 in)
1962
41.9 mm (1.6 in)
1963
22.1 mm (0.9 in)
1964
50.0 mm (2.0 in)
1965
43.2 mm (1.7 in)
1966
18.8 mm (0.7 in)
1967
30.0 mm (1.2 in)
1968
51.3 mm (2.0 in)
1969
25.1 mm (1.0 in)
1970
23.9 mm (0.9 in)
1971
15.2 mm (0.6 in)
1972
26.9 mm (1.1 in)
1973
24.6 mm (1.0 in)
1974
76.2 mm (3.0 in)
1975
44.5 mm (1.8 in)
1976
22.9 mm (0.9 in)
1977
30.5 mm (1.2 in)
1978
40.1 mm (1.6 in)
1979
22.9 mm (0.9 in)
1980
24.6 mm (1.0 in)
1981
24.4 mm (1.0 in)
1982
24.9 mm (1.0 in)
1983
60.2 mm (2.4 in)
1984
20.3 mm (0.8 in)
1985
45.2 mm (1.8 in)
1986
38.9 mm (1.5 in)
1987
17.8 mm (0.7 in)
1988
40.6 mm (1.6 in)
1989
33.3 mm (1.3 in)
1990
54.1 mm (2.1 in)
1991
48.3 mm (1.9 in)
1992
23.6 mm (0.9 in)
1993
68.6 mm (2.7 in)
1994
26.2 mm (1.0 in)
1995
62.2 mm (2.4 in)
1996
19.8 mm (0.8 in)
1997
58.9 mm (2.3 in)
1998
40.6 mm (1.6 in)
1999
31.2 mm (1.2 in)
2000
30.5 mm (1.2 in)
2001
21.1 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Iliad, 1950 to 2001. The record is 139.2 mm (5.5 in) in 1993, marked on the chart; the median year is 48.3 mm (1.9 in).
Wettest five days (Rx5day) at Iliad by year
Year
Wettest five days (Rx5day)
1950
48.8 mm (1.9 in)
1951
35.5 mm (1.4 in)
1955
n/a
1959
35.6 mm (1.4 in)
1960
30.7 mm (1.2 in)
1961
55.1 mm (2.2 in)
1962
49.5 mm (1.9 in)
1963
30.0 mm (1.2 in)
1964
103.3 mm (4.1 in)
1965
63.0 mm (2.5 in)
1966
38.6 mm (1.5 in)
1967
36.9 mm (1.5 in)
1968
113.1 mm (4.5 in)
1969
33.3 mm (1.3 in)
1970
37.8 mm (1.5 in)
1971
25.9 mm (1.0 in)
1972
31.0 mm (1.2 in)
1973
43.3 mm (1.7 in)
1974
83.9 mm (3.3 in)
1975
54.7 mm (2.2 in)
1976
27.4 mm (1.1 in)
1977
49.5 mm (1.9 in)
1978
49.0 mm (1.9 in)
1979
29.0 mm (1.1 in)
1980
32.5 mm (1.3 in)
1981
51.5 mm (2.0 in)
1982
74.7 mm (2.9 in)
1983
73.7 mm (2.9 in)
1984
20.3 mm (0.8 in)
1985
84.8 mm (3.3 in)
1986
52.3 mm (2.1 in)
1987
30.5 mm (1.2 in)
1988
40.6 mm (1.6 in)
1989
55.7 mm (2.2 in)
1990
57.9 mm (2.3 in)
1991
48.3 mm (1.9 in)
1992
40.8 mm (1.6 in)
1993
139.2 mm (5.5 in)
1994
50.6 mm (2.0 in)
1995
79.9 mm (3.1 in)
1996
28.8 mm (1.1 in)
1997
94.8 mm (3.7 in)
1998
53.0 mm (2.1 in)
1999
44.6 mm (1.8 in)
2000
30.8 mm (1.2 in)
2001
38.6 mm (1.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Iliad, 1950 to 2001. The record is 66 days in 1984, marked on the chart; the median year is 33 days.
Longest dry spell (CDD) at Iliad by year
Year
Longest dry spell (CDD)
1950
21 days
1951
31 days
1955
1 day
1959
30 days
1960
41 days
1961
30 days
1962
38 days
1963
31 days
1964
29 days
1965
53 days
1966
36 days
1967
34 days
1968
38 days
1969
57 days
1970
36 days
1971
26 days
1972
29 days
1973
29 days
1974
22 days
1975
26 days
1976
24 days
1977
32 days
1978
39 days
1979
27 days
1980
43 days
1981
43 days
1982
25 days
1983
59 days
1984
66 days
1985
32 days
1986
56 days
1987
50 days
1988
61 days
1989
18 days
1990
43 days
1991
31 days
1992
34 days
1993
30 days
1994
36 days
1995
46 days
1996
32 days
1997
48 days
1998
31 days
1999
27 days
2000
55 days
2001
54 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
29 years with a frost
Across 29 years with a frost, the median last spring frost at Iliad falls on 16 May and the median first autumn frost on 18 September, which leaves a median of 126 days between them.
Fitted over all years, the growing season changes by +8.1 days per decade at this station.
Frost dates and growing season at Iliad
Measure
Median, all years
Earliest period
Recent period (1960 to 1999)
Recent against earliest
Fitted trend
Last spring frost
16 May
n/a
16 May
n/a
-2.0 days per decade
First autumn frost
18 September
n/a
18 September
n/a
+6.0 days per decade
Growing days
126 days
n/a
126 days
n/a
+8.1 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.
Download the Data
Data for Iliad standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Iliad 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.