Mount Shasta, CA

California · Records since 1948–2026

☀️ 34°F Feels like 21°
Currently in Mount Shasta
As of 11:30 AM PDT

Records for September 11

🔥 Record High

95°F

September 11, 2015

+15° from 80° normal

❄ Record Low

30°F

September 11, 1985

-16° from 46° normal
🌞 Normal high: 80°F 🌑 Normal low: 46°F 1991–2020 normals

All-Time Records — Mount Shasta

🔥
106°F
Hottest Day Ever
Jul 29, 2022
❄
-13°F
Coldest Day Ever
Dec 22, 1990
🌧
5.97"
Wettest Day Ever
Jan 9, 1995
☃
37.4"
Most Snow in One Day
Dec 6, 1952

First & Last Dates — Mount Shasta

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)
201 days
Longest growing season
2015
29 days
Shortest growing season
1976
143 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 95°F September 11, 2015
2 95°F September 11, 2009
3 93°F September 11, 2017
4 93°F September 11, 1981
5 92°F September 11, 1948
6 91°F September 11, 2013
7 91°F September 11, 2007
8 90°F September 11, 2014
9 89°F September 11, 2006
10 89°F September 11, 2002

Top 5 Record Lows — September 11

# Temp Date
🥶 30°F September 11, 1985
2 32°F September 11, 1988
3 33°F September 11, 1972
4 34°F September 11, 1954
5 35°F September 11, 2005
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 1948–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Mount Shasta

threshold: 93°F (90th percentile of historical Jun–Aug highs)
4.8
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

1948–2026
30
2026 so far
25
Avg/year 1970–2025
43
Avg/year (last 10 complete)
65
Most in a year (2021)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Mount Shasta

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jun 25, 2021 – Jul 14, 2021 20 103°F (Jun 27) 97°F 56°F
2 Jul 4, 2024 – Jul 13, 2024 10 104°F (Jul 6) 101°F 57°F
3 Jul 11, 2018 – Jul 20, 2018 10 97°F (Jul 12) 95°F 56°F
4 Jul 23, 2022 – Jul 31, 2022 9 106°F (Jul 29) 100°F 57°F
5 Jul 24, 2016 – Aug 1, 2016 9 102°F (Jul 28) 97°F 56°F
6 Jul 27, 2017 – Aug 4, 2017 9 101°F (Aug 2) 97°F 57°F
7 Aug 1, 1978 – Aug 9, 1978 9 100°F (Aug 7) 97°F 57°F
8 Jul 18, 2024 – Jul 25, 2024 8 100°F (Jul 20) 97°F 58°F
9 Jul 12, 2014 – Jul 19, 2014 8 99°F (Jul 13) 96°F 58°F
10 Aug 9, 2021 – Aug 16, 2021 8 99°F (Aug 14) 95°F 58°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

42
2026 total
above-normal nights
39.1
Avg / summer
1970–2020
67
Most in a summer
2021

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 (1948–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1948, annual totals have trended -0.17" per decade, about -1.3" 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 Mount Shasta is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

183 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

16.00"
2026 YTD
Normal: 24.96"
-8.96"
0.42"
September so far
September normal: 0.51"
-0.09"
6
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Mount Shasta is 8.96" behind the normal pace

Period Review — Jun 1 – Aug 31, 2026

Any window, evaluated against every other year on record — 92 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
67.9°F
Average temperature
14th-warmest of 77
+1.4°
vs. average
Normal: 66.4°F (1991–2020)
0.14"
Precipitation
2nd-driest of 73
-1.42"
vs. average
Normal: 1.56" · 9% of normal

Average Temperature by Year — Jun 1 – Aug 31

1948–2026 · 2026 highlighted · trend +0.52° per decade (warming since 1948)

Precipitation by Year — Jun 1 – Aug 31

1948–2026 · 2026 highlighted · trend -0.05" per decade (drier since 1948)

Warmest Jun 1 – Aug 31 on Record

# Year Avg Temp
1 2021 71.5°F
2 2024 70.3°F
3 2017 69.9°F
4 2015 69.7°F
5 2022 69.5°F
6 2014 69.4°F
7 2023 69.0°F
8 2016 68.7°F
9 1960 68.5°F
10 2025 68.4°F

Coolest Jun 1 – Aug 31 on Record

# Year Avg Temp
1 1954 61.9°F
2 1983 62.2°F
3 1995 62.4°F
4 1963 62.5°F
5 1980 62.5°F
6 1953 62.7°F
7 1948 62.8°F
8 1976 62.8°F
9 1999 63.0°F
10 1989 63.1°F

Wettest Jun 1 – Aug 31 on Record

# Year Total
1 1982 4.74"
2 1948 3.82"
3 1958 3.73"
4 1954 3.66"
5 2005 3.57"
6 1995 3.43"
7 1984 3.39"
8 1952 3.30"
9 1976 3.26"
10 1965 3.13"

Driest Jun 1 – Aug 31 on Record

# Year Total
1 1957 0.02"
2 2026 0.14"
3 1973 0.14"
4 1960 0.15"
5 2008 0.17"
6 1994 0.19"
7 1981 0.21"
8 1951 0.26"
9 1949 0.31"
10 1955 0.32"
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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