46.604°N, 111.989°W · station HLNthr · 1880–2026 · 147 years of record
The Almanac Ribbon
Every day of the year at Helena: the record high and record low ever set (outer lines), the everyday normal range (shaded band), and the full record envelope behind it.
Record highRecord lowNormal high–low band (1991–2020)hottest ever 105°F · coldest ever -42°F
Records by Month
Month
Record high
Record low
Jan
63°Jan 7, 1902
-42°Jan 31, 1893
Feb
69°Feb 27, 1932
-42°Feb 2, 1996
Mar
78°Mar 30, 2004
-30°Mar 25, 1955
Apr
86°Apr 25, 1910
-10°Apr 1, 1936
May
95°May 28, 1919
17°May 2, 1954
Jun
104°Jun 14, 2021
30°Jun 13, 1969
Jul
105°Jul 12, 2002
36°Jul 1, 1898
Aug
105°Aug 24, 1969
28°Aug 25, 1992
Sep
102°Sep 7, 2022
6°Sep 24, 1926
Oct
89°Oct 4, 2024
-8°Oct 30, 1935
Nov
76°Nov 5, 2020
-39°Nov 16, 1959
Dec
70°Dec 1, 2021
-40°Dec 30, 1880
All-time
105°Aug 24, 1969
-42°Jan 31, 1893
Longest-Standing Records
The daily records that have held the longest — set in the earliest years and never beaten since. Highs power Helena on hottestsince.com; lows on coldestsince.com.
Oldest-standing record highs
Date
Record
Set
Standing
Jun 18
93°
1880
146yrs
Jan 8
57°
1885
141yrs
Dec 24
54°
1885
141yrs
Feb 7
62°
1886
140yrs
Feb 23
60°
1886
140yrs
May 22
89°
1886
140yrs
Dec 6
54°
1887
139yrs
Feb 3
61°
1889
137yrs
Apr 22
82°
1891
135yrs
Sep 28
89°
1892
134yrs
Jan 3
59°
1893
133yrs
Jan 4
57°
1893
133yrs
Oldest-standing record lows
Date
Record
Set
Standing
Apr 3
7°
1880
146yrs
Apr 4
6°
1880
146yrs
Apr 25
19°
1880
146yrs
May 10
25°
1880
146yrs
Jun 10
35°
1880
146yrs
Jul 12
38°
1880
146yrs
Jul 29
42°
1880
146yrs
Aug 30
34°
1880
146yrs
Nov 24
-17°
1880
146yrs
Dec 2
-24°
1880
146yrs
Dec 3
-26°
1880
146yrs
Dec 4
-24°
1880
146yrs
All-Time Extremes
Hottest ever
105°F
1969-08-24
Coldest ever
-42°F
1893-01-31
Longest heat streak
19 days
≥ 90°F · ended 2021-08-01
The Warming Trend
Helena's annual mean temperature, each year a stripe — blue below the 1991–2020 average, red above.
Days Above / Below the Mark
28 days ≥90°F in 2026 · normal 17 · record 54 in 2022
88 days ≤32°F in 2026 · normal 166 · record 213 in 1970
The Full Record
Every day of the year, record and normal high & low with the year each record was set. Type to filter, click a column to sort.