Klamath Falls, OR

Oregon · Records since 1897–2026

⛅ 69°F
Currently in Klamath Falls
As of 11:30 AM PDT

Records for September 11

🔥 Record High

95°F

September 11, 1922

+16° from 79° normal

❄ Record Low

29°F

September 11, 1909

-11° from 40° normal
🌞 Normal high: 79°F 🌑 Normal low: 40°F 1991–2020 normals

All-Time Records — Klamath Falls

🔥
104°F
Hottest Day Ever
Aug 7, 1972
❄
-20°F
Coldest Day Ever
Dec 8, 2013
🌧
2.58"
Wettest Day Ever
Dec 22, 1964
☃
24.0"
Most Snow in One Day
Jan 2, 1901

First & Last Dates — Klamath Falls

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)
159 days
Longest growing season
1947
1 days
Shortest growing season
2026
101 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 95°F September 11, 1922
2 93°F September 11, 2015
3 92°F September 11, 2009
4 92°F September 11, 1944
5 92°F September 11, 1899
6 91°F September 11, 2017
7 91°F September 11, 1993
8 91°F September 11, 1981
9 90°F September 11, 2013
10 90°F September 11, 1937

Top 5 Record Lows — September 11

# Temp Date
🥶 29°F September 11, 1909
2 31°F September 11, 1916
3 32°F September 11, 2018
4 32°F September 11, 2005
5 32°F September 11, 1915
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 1897–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Klamath Falls

threshold: 93°F (90th percentile of historical Jun–Aug highs)
5.0
Avg heat wave length
days (historical)
98°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1898–2026
16
2026 so far
21
Avg/year 1970–2025
31
Avg/year (last 10 complete)
58
Most in a year (1902)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Klamath Falls

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 1, 1906 – Jul 31, 1906 31 101°F (Jul 12) 97°F 55°F
2 Jul 17, 1931 – Jul 28, 1931 12 100°F (Jul 19) 96°F 60°F
3 Jun 26, 2021 – Jul 6, 2021 11 103°F (Jun 28) 96°F 53°F
4 Jul 18, 1905 – Jul 27, 1905 10 103°F (Jul 22) 99°F 54°F
5 Jul 4, 2024 – Jul 13, 2024 10 102°F (Jul 6) 98°F 51°F
6 Jul 10, 1917 – Jul 19, 1917 10 100°F (Jul 10) 95°F 60°F
7 Jul 25, 1973 – Aug 3, 1973 10 97°F (Jul 31) 95°F 57°F
8 Aug 2, 1905 – Aug 10, 1905 9 100°F (Aug 5) 96°F 55°F
9 Aug 26, 1902 – Sep 3, 1902 9 99°F (Aug 29) 98°F 52°F
10 Jul 24, 2022 – Jul 31, 2022 8 103°F (Jul 29) 100°F 57°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

37
2026 total
above-normal nights
55.3
Avg / summer
1970–2020
83
Most in a summer
1940

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 (1897–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1897, annual totals have trended +0.01" per decade, about +0.1" 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 Klamath Falls is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

166 of 250 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

5.34"
2026 YTD
Normal: 7.00"
-1.66"
0.62"
September so far
September normal: 0.30"
+0.32"
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 · Klamath Falls is 1.66" 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

1898–2025 · 2026 highlighted · trend +0.07° per decade (warming since 1898)

Precipitation by Year — Sep 1 – Sep 10

1898–2025 · 2026 highlighted · trend -0.01" per decade (drier since 1898)

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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