Cheyenne, WY

Wyoming · Records since 1872–2026

☀️ 81°F Feels like 72°
Currently in Cheyenne
As of 12:30 PM MDT

Records for September 11

🔥 Record High

91°F

September 11, 2021

+15° from 76° normal

❄ Record Low

23°F

September 11, 1878

-25° from 48° normal
🌞 Normal high: 76°F 🌑 Normal low: 48°F 1991–2020 normals

All-Time Records — Cheyenne

🔥
100°F
Hottest Day Ever
Jun 23, 1954
❄
-38°F
Coldest Day Ever
Jan 9, 1875
🌧
6.06"
Wettest Day Ever
Aug 1, 1985
☃
22.7"
Most Snow in One Day
Mar 14, 2021

First & Last Dates — Cheyenne

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)
177 days
Longest growing season
1981
86 days
Shortest growing season
1876
136 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 91°F September 11, 2021
2 88°F September 11, 2018
3 88°F September 11, 2016
4 88°F September 11, 1954
5 88°F September 11, 1895
6 87°F September 11, 1968
7 87°F September 11, 1959
8 86°F September 11, 1962
9 86°F September 11, 1943
10 86°F September 11, 1911

Top 5 Record Lows — September 11

# Temp Date
🥶 23°F September 11, 1878
2 28°F September 11, 1892
3 29°F September 11, 2014
4 31°F September 11, 1989
5 31°F September 11, 1902
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 1872–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Cheyenne

threshold: 89°F (90th percentile of historical Jun–Aug highs)
4.1
Avg heat wave length
days (historical)
94°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
6
Heat waves 2026
so far

Days ≥ 90°F Per Year

1873–2026
20
2026 so far
10
Avg/year 1970–2025
21
Avg/year (last 10 complete)
33
Most in a year (2020)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Cheyenne

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 1, 1874 – Jul 13, 1874 13 98°F (Jul 4) 92°F 54°F
2 Jul 12, 2022 – Jul 22, 2022 11 99°F (Jul 18) 94°F 62°F
3 Jul 11, 1934 – Jul 21, 1934 11 97°F (Jul 15) 93°F 61°F
4 Jul 3, 1966 – Jul 13, 1966 11 95°F (Jul 7) 92°F 60°F
5 Jul 12, 2003 – Jul 21, 2003 10 98°F (Jul 16) 93°F 62°F
6 Jul 1, 1989 – Jul 10, 1989 10 97°F (Jul 7) 94°F 56°F
7 Jul 21, 1987 – Jul 30, 1987 10 92°F (Jul 23) 91°F 60°F
8 Jul 8, 1939 – Jul 16, 1939 9 100°F (Jul 11) 94°F 57°F
9 Jul 29, 2024 – Aug 6, 2024 9 94°F (Jul 30) 93°F 58°F
10 Jul 12, 2002 – Jul 20, 2002 9 93°F (Jul 16) 92°F 59°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

64
2026 total
above-normal nights
37.9
Avg / summer
1970–2020
66
Most in a summer
2022

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 (1871–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1871, annual totals have trended +0.11" per decade, about +1.7" 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 Cheyenne is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

9.05"
2026 YTD
Normal: 12.36"
-3.31"
0.02"
September so far
September normal: 1.47"
-1.45"
2
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Cheyenne is 3.31" behind the normal pace

Period Review — Sep 3 – Sep 10, 2026

Any window, evaluated against every other year on record — 8 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
69.6°F
Average temperature
4th-warmest of 154
+6.5°
vs. average
Normal: 63.1°F (1991–2020)
0.02"
Precipitation
37th-driest of 156
-0.34"
vs. average
Normal: 0.36" · 6% of normal

Average Temperature by Year — Sep 3 – Sep 10

1873–2026 · 2026 highlighted · trend +0.31° per decade (warming since 1873)

Precipitation by Year — Sep 3 – Sep 10

1871–2026 · 2026 highlighted

Warmest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 1998 72.3°F
2 2013 71.6°F
3 1931 69.9°F
4 1979 69.6°F
5 2026 69.6°F
6 2005 69.6°F
7 1978 68.9°F
8 2021 68.7°F
9 1933 68.5°F
10 2019 68.4°F

Coolest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 1929 41.0°F
2 1898 50.4°F
3 1918 52.0°F
4 1878 52.4°F
5 1885 52.9°F
6 2008 53.6°F
7 1962 53.7°F
8 1943 54.4°F
9 1935 54.6°F
10 2020 54.9°F

Wettest Sep 3 – Sep 10 on Record

# Year Total
1 1973 3.21"
2 1920 2.17"
3 1963 1.78"
4 1912 1.58"
5 1929 1.47"
6 1935 1.40"
7 1900 1.32"
8 1991 1.28"
9 2013 1.27"
10 1989 1.24"

Driest Sep 3 – Sep 10 on Record

# Year Total
1 2023 0.00"
2 2017 0.00"
3 2016 0.00"
4 2015 0.00"
5 2010 0.00"
6 2005 0.00"
7 1998 0.00"
8 1994 0.00"
9 1992 0.00"
10 1988 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.
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