Deer Lodge, MT

Montana · Records since 1893–2026

🌤️ 44°F Feels like 36°
Currently in Deer Lodge
As of 12:00 PM MDT

Records for September 11

🔥 Record High

91°F

September 11, 1994

+19° from 72° normal

❄ Record Low

21°F

September 11, 2014

-15° from 36° normal
🌞 Normal high: 72°F 🌑 Normal low: 36°F 1991–2020 normals

All-Time Records — Deer Lodge

🔥
108°F
Hottest Day Ever
Jul 22, 1901
❄
-42°F
Coldest Day Ever
Dec 14, 1919
🌧
2.13"
Wettest Day Ever
Jul 31, 1997
☃
14.8"
Most Snow in One Day
Feb 7, 1975

First & Last Dates — Deer Lodge

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)
137 days
Longest growing season
1940
0 days
Shortest growing season
1993
53 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 91°F September 11, 1994
2 89°F September 11, 1958
3 88°F September 11, 1959
4 87°F September 11, 1968
5 87°F September 11, 1899
6 86°F September 11, 1953
7 86°F September 11, 1940
8 85°F September 11, 2021
9 85°F September 11, 1981
10 84°F September 11, 1971

Top 5 Record Lows — September 11

# Temp Date
🥶 21°F September 11, 2014
2 22°F September 11, 1989
3 24°F September 11, 2005
4 24°F September 11, 1979
5 24°F September 11, 1964
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1893–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Deer Lodge

threshold: 89°F (90th percentile of historical Jun–Aug highs)
4.4
Avg heat wave length
days (historical)
94°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

Days ≥ 90°F Per Year

1899–2026
9
2026 so far
9
Avg/year 1970–2025
9
Avg/year (last 10 complete)
51
Most in a year (1919)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Deer Lodge

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 15, 1901 – Jul 26, 1901 12 108°F (Jul 22) 98°F 64°F
2 Jun 18, 1919 – Jun 27, 1919 10 100°F (Jun 25) 94°F 45°F
3 Jul 8, 1919 – Jul 17, 1919 10 100°F (Jul 9) 95°F 41°F
4 Jul 17, 1931 – Jul 26, 1931 10 98°F (Jul 21) 94°F 50°F
5 Jul 30, 1961 – Aug 7, 1961 9 100°F (Aug 4) 93°F 42°F
6 Aug 8, 1971 – Aug 16, 1971 9 96°F (Aug 15) 91°F 46°F
7 Jul 29, 1901 – Aug 5, 1901 8 104°F (Jul 30) 96°F 64°F
8 Jul 27, 1919 – Aug 3, 1919 8 103°F (Aug 3) 96°F 44°F
9 Jul 18, 2024 – Jul 25, 2024 8 98°F (Jul 23) 93°F 48°F
10 Jul 30, 1949 – Aug 6, 1949 8 96°F (Aug 5) 92°F 50°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

36
2026 total
above-normal nights
33.0
Avg / summer
1970–2020
81
Most in a summer
1941

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1893–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1893, annual totals have trended +0.30" per decade, about +3.9" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

This Year — 2026

How Deer Lodge is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

145 of 206 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

7.89"
2026 YTD
Normal: 11.66"
-3.77"
0.00"
September so far
September normal: 1.35"
-1.35"
2
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Deer Lodge is 3.77" behind the normal pace

Period Review — Aug 11 – Sep 10, 2026

Any window, evaluated against every other year on record — 31 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
2026 is still under way for this window — totals and rankings appear once September 10 passes.

Average Temperature by Year — Aug 11 – Sep 10

1899–2025 · 2026 highlighted · trend -0.06° per decade (cooling since 1899)

Precipitation by Year — Aug 11 – Sep 10

1905–2025 · 2026 highlighted · trend +0.06" per decade (wetter since 1905)

About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
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