Dworshak, ID

Idaho · Records since 1903–2026

⛅ 73°F
Currently in Dworshak
As of 11:30 AM PDT

Records for September 11

🔥 Record High

103°F

September 11, 1953

+21° from 82° normal

❄ Record Low

33°F

September 11, 1910

-16° from 49° normal
🌞 Normal high: 82°F 🌑 Normal low: 49°F 1991–2020 normals

All-Time Records — Dworshak

🔥
118°F
Hottest Day Ever
Jul 28, 1934
❄
-22°F
Coldest Day Ever
Jan 21, 1937
🌧
2.77"
Wettest Day Ever
Jul 27, 1909
☃
18.0"
Most Snow in One Day
Feb 4, 1914

First & Last Dates — Dworshak

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)
222 days
Longest growing season
2025
97 days
Shortest growing season
1908
182 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 103°F September 11, 1953
2 103°F September 11, 1937
3 99°F September 11, 1963
4 99°F September 11, 1944
5 99°F September 11, 1935
6 98°F September 11, 1908
7 97°F September 11, 1996
8 97°F September 11, 1990
9 96°F September 11, 2002
10 95°F September 11, 1960

Top 5 Record Lows — September 11

# Temp Date
🥶 33°F September 11, 1910
2 33°F September 11, 1904
3 34°F September 11, 1906
4 35°F September 11, 1928
5 35°F September 11, 1913
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 1903–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Dworshak

threshold: 100°F (90th percentile of historical Jun–Aug highs)
4.5
Avg heat wave length
days (historical)
106°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1903–2026
58
2026 so far
53
Avg/year 1970–2025
48
Avg/year (last 10 complete)
87
Most in a year (1934)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Dworshak

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 17, 1931 – Jul 29, 1931 13 116°F (Jul 20) 105°F 57°F
2 Aug 1, 1905 – Aug 12, 1905 12 108°F (Aug 6) 103°F 52°F
3 Jul 16, 1959 – Jul 26, 1959 11 111°F (Jul 23) 103°F 58°F
4 Aug 11, 1967 – Aug 21, 1967 11 107°F (Aug 18) 104°F 60°F
5 Aug 8, 1933 – Aug 17, 1933 10 108°F (Aug 16) 105°F 54°F
6 Jul 21, 1928 – Jul 29, 1928 9 114°F (Jul 26) 109°F 58°F
7 Jul 1, 1906 – Jul 9, 1906 9 107°F (Jul 6) 103°F 48°F
8 Aug 13, 1977 – Aug 21, 1977 9 104°F (Aug 19) 102°F 60°F
9 Jul 23, 1934 – Jul 30, 1934 8 118°F (Jul 28) 108°F 58°F
10 Jul 16, 1936 – Jul 23, 1936 8 112°F (Jul 21) 106°F 59°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

63
2026 total
above-normal nights
45.2
Avg / summer
1970–2020
81
Most in a summer
2025

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 (1903–2026)

Blue = above average · tan = below average · gold = 2026 (partial)

Heavy Rain Days Per Year (≥ 1.0")

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

This Year — 2026

How Dworshak is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

159 of 238 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

7.93"
2026 YTD
Normal: 16.96"
-9.03"
0.00"
September so far
September normal: 0.87"
-0.87"
3
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Dworshak is 9.03" 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

1903–2024 · 2026 highlighted · trend +0.27° per decade (warming since 1903)

Precipitation by Year — Sep 1 – Sep 10

1903–2024 · 2026 highlighted · trend -0.02" per decade (drier since 1903)

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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