Roundup climate

Roundup Weather in October

NOAA 1991-2020 normals for Roundup, 1.1 km from Roundup

Average highs run from 69°F on October 1 to 53°F on October 31, and lows from 38°F to 26°F. Normal precipitation for the month is 1.22 in over about 7 wet days.

October day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Roundup, in °F, with the record for each date.-20020406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

October at a glance

Average high
61°F
Average low
32°F
Precipitation
1.22 in
Snowfall
1.0 in
Record high
90°FOct 3, 1987
Record low
-9°FOct 29, 1991
Chance of a freeze
100%
Daylight
11 h 41 min to 10 h 06 min
Cloud cover
64%
Humidity
60%
Dew point
30°F
Wind
10.5 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Oct 169°F38°F89°F 199214°F 195021%1%
Oct 269°F37°F89°F 196315°F 195021%1%
Oct 368°F37°F90°F 198718°F 196821%1%
Oct 467°F36°F88°F 197024°F 195021%1%
Oct 567°F36°F89°F 198011°F 195221%1%
Oct 666°F36°F86°F 19609°F 195221%1%
Oct 766°F35°F89°F 198014°F 200021%1%
Oct 865°F35°F88°F 198011°F 198521%1%
Oct 965°F35°F86°F 197115°F 199321%1%
Oct 1064°F34°F88°F 195310°F 201921%1%
Oct 1164°F34°F89°F 193412°F 200921%1%
Oct 1263°F33°F88°F 193415°F 200921%1%
Oct 1362°F33°F85°F 196413°F 196921%1%
Oct 1462°F32°F86°F 195815°F 196921%1%
Oct 1561°F32°F87°F 196114°F 197621%1%
Oct 1661°F32°F84°F 196111°F 196920%2%
Oct 1760°F31°F84°F 195810°F 194820%2%
Oct 1860°F31°F85°F 195816°F 195120%2%
Oct 1959°F30°F84°F 200316°F 196020%2%
Oct 2059°F30°F80°F 194019°F 198220%2%
Oct 2158°F30°F83°F 199216°F 198120%2%
Oct 2258°F29°F83°F 19157°F 193619%2%
Oct 2357°F29°F84°F 194810°F 195719%2%
Oct 2457°F29°F82°F 200714°F 194219%2%
Oct 2556°F28°F81°F 199011°F 194219%2%
Oct 2656°F28°F83°F 19607°F 195119%2%
Oct 2755°F28°F80°F 19442°F 202318%2%
Oct 2855°F27°F81°F 19680°F 202318%3%
Oct 2954°F27°F86°F 1968-9°F 199118%3%
Oct 3054°F27°F77°F 1950-7°F 199118%3%
Oct 3153°F26°F81°F 1987-5°F 193517%3%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Roundup, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

October 1
sunrise 7:13 AM, sunset 6:54 PM
October 31
sunrise 7:54 AM, sunset 6:00 PM

Every day of October: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00247214 (Roundup), public domain. Records: NOAA GHCN-Daily, station USC00243727, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.