Lancaster, CA

California · Records since 1945–2026

☀️ 96°F
Currently in Lancaster
As of 11:30 AM PDT

Records for September 11

🔥 Record High

108°F

September 11, 1948

+15° from 93° normal

❄ Record Low

40°F

September 11, 1998

-19° from 59° normal
🌞 Normal high: 93°F 🌑 Normal low: 59°F 1991–2020 normals

All-Time Records — Lancaster

🔥
115°F
Hottest Day Ever
Jul 7, 2024
❄
2°F
Coldest Day Ever
Dec 24, 1984
🌧
3.59"
Wettest Day Ever
Aug 20, 2023
☃
12.0"
Most Snow in One Day
Dec 18, 1984

First & Last Dates — Lancaster

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)
261 days
Longest growing season
1965
165 days
Shortest growing season
1948
209 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 108°F September 11, 1948
2 105°F September 11, 1953
3 105°F September 11, 1945
4 104°F September 11, 2009
5 103°F September 11, 1979
6 103°F September 11, 1955
7 102°F September 11, 2015
8 102°F September 11, 1990
9 102°F September 11, 1970
10 101°F September 11, 1993

Top 5 Record Lows — September 11

# Temp Date
🥶 40°F September 11, 1998
2 47°F September 11, 2020
3 47°F September 11, 2010
4 47°F September 11, 1986
5 47°F September 11, 1946
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 1945–2026. Climate normals represent the 1991–2020 average.
1
day
Hot Streak
1 consecutive day at or above 104°F · since September 10
2 more days to heat wave status

Heat Wave Summary — Lancaster

threshold: 104°F (90th percentile of historical Jun–Aug highs)
4.4
Avg heat wave length
days (historical)
108°
Avg peak temp
during heat waves
42
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

Days ≥ 90°F Per Year

1945–2026
97
2026 so far
105
Avg/year 1970–2025
117
Avg/year (last 10 complete)
139
Most in a year (2020)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Lancaster

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 2, 2024 – Jul 13, 2024 12 115°F (Jul 7) 110°F 73°F
2 Aug 29, 1955 – Sep 8, 1955 11 110°F (Sep 6) 107°F 63°F
3 Jun 17, 2017 – Jun 26, 2017 10 110°F (Jun 19) 107°F 70°F
4 Aug 30, 2022 – Sep 7, 2022 9 113°F (Sep 2) 109°F 71°F
5 Aug 26, 1950 – Sep 3, 1950 9 112°F (Sep 2) 108°F 67°F
6 Aug 6, 2012 – Aug 14, 2012 9 109°F (Aug 9) 107°F 71°F
7 Jul 6, 2021 – Jul 13, 2021 8 113°F (Jul 10) 108°F 77°F
8 Jul 19, 2006 – Jul 26, 2006 8 111°F (Jul 23) 107°F 73°F
9 Aug 14, 2020 – Aug 21, 2020 8 111°F (Aug 16) 109°F 72°F
10 Jul 12, 2005 – Jul 19, 2005 8 110°F (Jul 18) 108°F 71°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

65
2026 total
above-normal nights
41.8
Avg / summer
1970–2020
72
Most in a summer
2018

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 (1945–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1945, annual totals have trended +0.22" per decade, about +1.8" 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 Lancaster is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

3.19"
2026 YTD
Normal: 4.90"
-1.71"
0.32"
September so far
September normal: 0.12"
+0.20"
0
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Lancaster is 1.71" behind the normal pace

Period Review — Jun 12 – Sep 10, 2026

Any window, evaluated against every other year on record — 91 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
82.0°F
Average temperature
11th-warmest of 81
+1.3°
vs. average
Normal: 80.7°F (1991–2020)
0.32"
Precipitation
18th-wettest of 80
+0.13"
vs. average
Normal: 0.19" · 168% of normal

Average Temperature by Year — Jun 12 – Sep 10

1945–2026 · 2026 highlighted · trend +0.47° per decade (warming since 1945)

Precipitation by Year — Jun 12 – Sep 10

1945–2026 · 2026 highlighted · trend +0.03" per decade (wetter since 1945)

Warmest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 2022 85.0°F
2 2021 84.8°F
3 2017 84.5°F
4 2024 84.3°F
5 2018 83.5°F
6 2008 83.1°F
7 2007 83.0°F
8 2013 82.7°F
9 2016 82.3°F
10 1961 82.1°F

Coolest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 1965 75.5°F
2 1983 76.3°F
3 1963 76.7°F
4 1987 77.1°F
5 1992 77.3°F
6 1991 77.3°F
7 1947 77.3°F
8 1975 77.4°F
9 1976 77.7°F
10 1978 77.8°F

Wettest Jun 12 – Sep 10 on Record

# Year Total
1 2023 3.66"
2 1983 2.35"
3 2015 2.34"
4 1963 1.52"
5 1978 1.32"
6 1976 1.18"
7 1968 1.04"
8 1977 1.03"
9 1967 0.95"
10 1999 0.95"

Driest Jun 12 – Sep 10 on Record

# Year Total
1 2024 0.00"
2 2020 0.00"
3 2016 0.00"
4 2010 0.00"
5 2009 0.00"
6 2008 0.00"
7 2004 0.00"
8 1994 0.00"
9 1993 0.00"
10 1989 0.00"
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.
← Back to all stations