Salmon, ID

Idaho · Records since 1905–2026

☀️ 71°F
Currently in Salmon
As of 12:30 PM MDT

Records for September 11

🔥 Record High

93°F

September 11, 1959

+17° from 76° normal

❄ Record Low

28°F

September 11, 1957

-14° from 42° normal
🌞 Normal high: 76°F 🌑 Normal low: 42°F 1991–2020 normals

All-Time Records — Salmon

🔥
106°F
Hottest Day Ever
Jul 21, 1936
❄
-37°F
Coldest Day Ever
Jan 21, 1937
🌧
1.60"
Wettest Day Ever
Jul 26, 2017
☃
10.5"
Most Snow in One Day
Jan 11, 2000

First & Last Dates — Salmon

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)
162 days
Longest growing season
2015
27 days
Shortest growing season
1935
129 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 93°F September 11, 1959
2 91°F September 11, 1919
3 90°F September 11, 1944
4 89°F September 11, 1996
5 89°F September 11, 1981
6 89°F September 11, 1958
7 89°F September 11, 1953
8 89°F September 11, 1943
9 89°F September 11, 1937
10 88°F September 11, 2004

Top 5 Record Lows — September 11

# Temp Date
🥶 28°F September 11, 1957
2 29°F September 11, 1937
3 29°F September 11, 1929
4 29°F September 11, 1924
5 29°F September 11, 1910
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 1905–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Salmon

threshold: 95°F (90th percentile of historical Jun–Aug highs)
4.2
Avg heat wave length
days (historical)
100°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

Days ≥ 90°F Per Year

1906–2026
42
2026 so far
31
Avg/year 1970–2025
34
Avg/year (last 10 complete)
64
Most in a year (1919)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Salmon

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 20, 1988 – Jul 31, 1988 12 101°F (Jul 21) 97°F 55°F
2 Jul 9, 1919 – Jul 17, 1919 9 103°F (Jul 15) 99°F 51°F
3 Jul 18, 2024 – Jul 26, 2024 9 102°F (Jul 25) 98°F 58°F
4 Jul 15, 1960 – Jul 22, 1960 8 105°F (Jul 20) 100°F 50°F
5 Jul 20, 1945 – Jul 27, 1945 8 102°F (Jul 25) 98°F 49°F
6 Jul 30, 1949 – Aug 6, 1949 8 100°F (Aug 4) 98°F 50°F
7 Jul 2, 1985 – Jul 9, 1985 8 100°F (Jul 5) 98°F 55°F
8 Aug 13, 1967 – Aug 20, 1967 8 98°F (Aug 17) 97°F 46°F
9 Jul 15, 1936 – Jul 21, 1936 7 106°F (Jul 21) 101°F 49°F
10 Jul 19, 1946 – Jul 25, 1946 7 104°F (Jul 21) 100°F 46°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

47
2026 total
above-normal nights
43.4
Avg / summer
1970–2020
62
Most in a summer
2006

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 (1905–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1905, annual totals have trended +0.05" per decade, about +0.6" 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 Salmon is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

182 of 245 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

4.69"
2026 YTD
Normal: 6.75"
-2.06"
1.00"
September so far
September normal: 0.79"
+0.21"
1
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Salmon is 2.06" behind the normal pace

Period Review — Sep 1 – Sep 10, 2026

Any window, evaluated against every other year on record — 10 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 — Sep 1 – Sep 10

1906–2025 · 2026 highlighted · trend +0.28° per decade (warming since 1906)

Precipitation by Year — Sep 1 – Sep 10

1906–2025 · 2026 highlighted

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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