Record envelope, standing records and threshold days for Troy 18 N (USC00248395), Montana, United States, with 34 years of record.
Key Facts for Troy 18 N
Troy 18 N (USC00248395) is a weather station in Montana, United States at 48.72 latitude and -115.88 longitude, 828 m (2,715 ft) above sea level.
The station reports from 1961 to 1994, 34 years of record.
1,464 records set at Troy 18 N still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Troy 18 N set a daily record high minimum temperature of 7.2 C (45.0 F) on 10 May 1994.
About the Station
Location: Montana, United States, 48.72 latitude, -115.88 longitude.
Elevation: 828 m (2,715 ft).
Period of record: 1961 to 1994, 34 years.
Eligible elements: tmax, tmin, prcp, snow.
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 Troy 18 N. 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 Troy 18 N, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
10.6 C (51.1 F)
-32.2 C (-26.0 F)
n/a
n/a
Feb
14.4 C (57.9 F)
-29.4 C (-20.9 F)
n/a
n/a
Mar
22.8 C (73.0 F)
-25.0 C (-13.0 F)
n/a
n/a
Apr
31.1 C (88.0 F)
-15.6 C (3.9 F)
n/a
n/a
May
35.0 C (95.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-2.8 C (27.0 F)
n/a
n/a
Jul
38.3 C (100.9 F)
0.0 C (32.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-6.7 C (19.9 F)
n/a
n/a
Oct
26.7 C (80.1 F)
-16.1 C (3.0 F)
n/a
n/a
Nov
17.2 C (63.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Dec
9.4 C (48.9 F)
-37.2 C (-35.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Troy 18 N still stand. 1962 holds the most, with 87.
Standing records at Troy 18 N by the year they were set
Year set
Standing records
1961
41
1962
87
1963
57
1964
41
1965
43
1966
23
1967
46
1968
50
1969
49
1970
38
1971
46
1972
66
1973
41
1974
40
1975
61
1976
34
1977
39
1978
40
1979
37
1980
33
1981
46
1982
23
1983
41
1984
48
1985
68
1986
46
1987
34
1988
28
1989
41
1990
44
1991
28
1992
55
1993
42
1994
8
Wettest Day of Each Month
Nov: 81.5 mm (3.2 in)
The wettest day on record for each calendar month at Troy 18 N. The most was 81.5 mm (3.2 in) on 12 November 1973.
Record daily precipitation for each month at Troy 18 N
Month
Record daily precipitation (mm)
Date
Jan
69.9 mm (2.8 in)
15 January 1974
Feb
52.3 mm (2.1 in)
16 February 1982
Mar
30.0 mm (1.2 in)
3 March 1987
Apr
40.4 mm (1.6 in)
5 April 1991
May
39.6 mm (1.6 in)
30 May 1969
Jun
44.2 mm (1.7 in)
8 June 1973
Jul
50.3 mm (2.0 in)
14 July 1983
Aug
39.6 mm (1.6 in)
18 August 1980
Sep
47.5 mm (1.9 in)
11 September 1962
Oct
48.5 mm (1.9 in)
16 October 1988
Nov
81.5 mm (3.2 in)
12 November 1973
Dec
65.3 mm (2.6 in)
4 December 1975
Period of Record Coverage
1961 to 1994
Complete yearUnder 90 percent of days
34 years of record at Troy 18 N, 1961 to 1994. 17 years have data for under 90 percent of days and are left out of rankings: 1961, 1962, 1964, 1965, 1966, 1967, 1977, 1979 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 18 complete years at Troy 18 N, 1963 to 1990. Blue stripes are years cooler than the station's own mean of 6.3 C (43.3 F); red stripes are warmer. The coolest year was 1985, at 5.3 C (41.5 F), and the warmest was 1986, at 7.5 C (45.4 F). The strongest colour marks a difference of 1.2 C (2.2 F).
Annual mean temperature at Troy 18 N as warming stripes, 1963 to 1990
Year
Annual mean temperature
Difference from the station mean
1963
7.2 C
+0.93 C
1968
6.3 C
-0.04 C
1969
6.1 C
-0.17 C
1970
6.0 C
-0.34 C
1971
6.0 C
-0.28 C
1972
5.7 C
-0.55 C
1973
6.1 C
-0.20 C
1974
6.0 C
-0.30 C
1975
5.3 C
-0.98 C
1976
6.4 C
+0.10 C
1978
6.1 C
-0.18 C
1980
6.6 C
+0.29 C
1981
6.9 C
+0.60 C
1982
6.1 C
-0.21 C
1983
7.0 C
+0.68 C
1985
5.3 C
-1.01 C
1986
7.5 C
+1.18 C
1990
6.8 C
+0.48 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
1961 to 1994
Yearly extremes at Troy 18 N: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1961
35.6 C (96.1 F)
34
Coldest night (TNn)
-37.2 C (-35.0 F)
1968
-26.9 C (-16.5 F)
34
Wettest day (Rx1day)
81.5 mm (3.2 in)
1973
39.6 mm (1.6 in)
34
Wettest five days (Rx5day)
173.0 mm (6.8 in)
1974
77.6 mm (3.1 in)
34
Longest dry spell (CDD)
40 days
1971
22 days
34
Hottest day (TXx)
The hottest day of the year at Troy 18 N, 1961 to 1994. The record is 40.6 C (105.1 F) in 1961, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Troy 18 N by year
Year
Hottest day (TXx)
1961
40.6 C (105.1 F)
1962
35.6 C (96.1 F)
1963
35.0 C (95.0 F)
1964
35.6 C (96.1 F)
1965
35.6 C (96.1 F)
1966
36.1 C (97.0 F)
1967
37.2 C (99.0 F)
1968
35.6 C (96.1 F)
1969
35.0 C (95.0 F)
1970
35.6 C (96.1 F)
1971
36.7 C (98.1 F)
1972
35.0 C (95.0 F)
1973
36.7 C (98.1 F)
1974
34.4 C (93.9 F)
1975
36.7 C (98.1 F)
1976
33.9 C (93.0 F)
1977
36.7 C (98.1 F)
1978
36.1 C (97.0 F)
1979
38.3 C (100.9 F)
1980
35.6 C (96.1 F)
1981
34.4 C (93.9 F)
1982
33.3 C (91.9 F)
1983
34.4 C (93.9 F)
1984
37.2 C (99.0 F)
1985
37.2 C (99.0 F)
1986
36.1 C (97.0 F)
1987
35.6 C (96.1 F)
1988
39.4 C (102.9 F)
1989
35.0 C (95.0 F)
1990
35.0 C (95.0 F)
1991
36.1 C (97.0 F)
1992
36.1 C (97.0 F)
1993
33.3 C (91.9 F)
1994
27.8 C (82.0 F)
Coldest night (TNn)
The coldest night of the year at Troy 18 N, 1961 to 1994. The record is -37.2 C (-35.0 F) in 1968, marked on the chart; the median year is -26.9 C (-16.5 F).
Coldest night (TNn) at Troy 18 N by year
Year
Coldest night (TNn)
1961
-27.8 C (-18.0 F)
1962
-28.9 C (-20.0 F)
1963
-29.4 C (-20.9 F)
1964
-33.3 C (-27.9 F)
1965
-20.6 C (-5.1 F)
1966
-21.7 C (-7.1 F)
1967
-20.6 C (-5.1 F)
1968
-37.2 C (-35.0 F)
1969
-27.2 C (-17.0 F)
1970
-23.3 C (-9.9 F)
1971
-24.4 C (-11.9 F)
1972
-30.0 C (-22.0 F)
1973
-25.0 C (-13.0 F)
1974
-26.7 C (-16.1 F)
1975
-27.2 C (-17.0 F)
1976
-22.2 C (-8.0 F)
1977
-26.7 C (-16.1 F)
1978
-31.7 C (-25.1 F)
1979
-32.2 C (-26.0 F)
1980
-28.9 C (-20.0 F)
1981
-26.1 C (-15.0 F)
1982
-26.1 C (-15.0 F)
1983
-27.2 C (-17.0 F)
1984
-20.6 C (-5.1 F)
1985
-27.2 C (-17.0 F)
1986
-20.6 C (-5.1 F)
1987
-20.6 C (-5.1 F)
1988
-22.2 C (-8.0 F)
1989
-29.4 C (-20.9 F)
1990
-33.3 C (-27.9 F)
1991
-22.8 C (-9.0 F)
1992
-19.4 C (-2.9 F)
1993
-28.3 C (-18.9 F)
1994
-27.2 C (-17.0 F)
Wettest day (Rx1day)
The wettest day of the year at Troy 18 N, 1961 to 1994. The record is 81.5 mm (3.2 in) in 1973, marked on the chart; the median year is 39.6 mm (1.6 in).
Wettest day (Rx1day) at Troy 18 N by year
Year
Wettest day (Rx1day)
1961
25.4 mm (1.0 in)
1962
50.5 mm (2.0 in)
1963
44.7 mm (1.8 in)
1964
37.3 mm (1.5 in)
1965
33.5 mm (1.3 in)
1966
32.0 mm (1.3 in)
1967
39.6 mm (1.6 in)
1968
44.2 mm (1.7 in)
1969
39.6 mm (1.6 in)
1970
25.9 mm (1.0 in)
1971
34.3 mm (1.4 in)
1972
34.3 mm (1.4 in)
1973
81.5 mm (3.2 in)
1974
69.9 mm (2.8 in)
1975
65.3 mm (2.6 in)
1976
27.9 mm (1.1 in)
1977
36.8 mm (1.4 in)
1978
32.5 mm (1.3 in)
1979
41.7 mm (1.6 in)
1980
50.8 mm (2.0 in)
1981
31.2 mm (1.2 in)
1982
52.3 mm (2.1 in)
1983
50.3 mm (2.0 in)
1984
43.7 mm (1.7 in)
1985
40.6 mm (1.6 in)
1986
42.2 mm (1.7 in)
1987
30.0 mm (1.2 in)
1988
56.4 mm (2.2 in)
1989
31.0 mm (1.2 in)
1990
45.7 mm (1.8 in)
1991
40.4 mm (1.6 in)
1992
25.4 mm (1.0 in)
1993
21.6 mm (0.9 in)
1994
20.3 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Troy 18 N, 1961 to 1994. The record is 173.0 mm (6.8 in) in 1974, marked on the chart; the median year is 77.6 mm (3.1 in).
Wettest five days (Rx5day) at Troy 18 N by year
Year
Wettest five days (Rx5day)
1961
70.9 mm (2.8 in)
1962
80.9 mm (3.2 in)
1963
77.2 mm (3.0 in)
1964
106.9 mm (4.2 in)
1965
72.4 mm (2.9 in)
1966
69.9 mm (2.8 in)
1967
62.5 mm (2.5 in)
1968
91.7 mm (3.6 in)
1969
71.6 mm (2.8 in)
1970
43.3 mm (1.7 in)
1971
97.0 mm (3.8 in)
1972
87.1 mm (3.4 in)
1973
162.8 mm (6.4 in)
1974
173.0 mm (6.8 in)
1975
135.2 mm (5.3 in)
1976
49.2 mm (1.9 in)
1977
74.7 mm (2.9 in)
1978
54.6 mm (2.1 in)
1979
78.0 mm (3.1 in)
1980
99.0 mm (3.9 in)
1981
62.1 mm (2.4 in)
1982
135.9 mm (5.4 in)
1983
94.3 mm (3.7 in)
1984
83.9 mm (3.3 in)
1985
92.7 mm (3.6 in)
1986
119.9 mm (4.7 in)
1987
72.4 mm (2.9 in)
1988
95.0 mm (3.7 in)
1989
74.3 mm (2.9 in)
1990
104.1 mm (4.1 in)
1991
76.9 mm (3.0 in)
1992
44.9 mm (1.8 in)
1993
30.5 mm (1.2 in)
1994
30.0 mm (1.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Troy 18 N, 1961 to 1994. The record is 40 days in 1971, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at Troy 18 N by year
Year
Longest dry spell (CDD)
1961
13 days
1962
19 days
1963
25 days
1964
20 days
1965
18 days
1966
31 days
1967
36 days
1968
21 days
1969
30 days
1970
28 days
1971
40 days
1972
16 days
1973
30 days
1974
34 days
1975
16 days
1976
24 days
1977
22 days
1978
22 days
1979
31 days
1980
14 days
1981
34 days
1982
14 days
1983
15 days
1984
27 days
1985
35 days
1986
23 days
1987
18 days
1988
25 days
1989
22 days
1990
21 days
1991
28 days
1992
14 days
1993
21 days
1994
17 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.
Download the Data
Data for Troy 18 N standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Troy 18 N 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.