October is close to Castle Rock's year-round average, with average highs near 17.4°C and lows around 1.9°C (mean 9.6°C). It is about average for rainfall, averaging 29 mm of rainfall and 48% relative humidity across the period.
October is close to Castle Rock's year-round average. Across 45 years of records, the warmest October in Castle Rock was 2024 — when the month averaged 14.2°C — while the coldest was 1984 at 5.4°C. Typical October days reach 17.4°C with nights near 1.9°C. The long-term trend is warming, about 0.4°C per decade.
October is about average for rainfall in Castle Rock, averaging 29 mm of rainfall. The wettest October on record was 1984 with 102 mm, while the driest was 1988 at 5 mm.
Relative humidity in Castle Rock during October averages 48%. The most humid October was 1984 at 67%, and the least humid was 2020 at 38%.
October receives about 4 kWh/m²/day of solar energy in Castle Rock. The sunniest Octobers were 2003, 2016 and 2021, among others at 4.3 kWh/m²/day, and the cloudiest was 1984 at 3.
Average wind speed in Castle Rock during October is 2.3 m/s. The windiest October was 1997 at 2.7 m/s, while the calmest were 2002, 2014 and 2015, among others at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.9°C | 9.5°C | 9.5°C | 9.8°C | 11.2°C | +2.3°C |
| Avg High | 16.4°C | 17.3°C | 17.3°C | 17.5°C | 19.2°C | +2.8°C |
| Avg Low | 1.4°C | 1.7°C | 1.7°C | 2.1°C | 3.2°C | +1.8°C |
| Avg Rain | 33 mm | 29 mm | 32 mm | 29 mm | 13 mm | -20 mm |
October temperatures in Castle Rock have risen by about 3.2°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -16.6°C (1997) to a record high of 29°C (2024).
Rainfall in October is about average for rainfall, averaging 29 mm, with a wettest year of 102 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.5°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A good time to visit Castle Rock
October is a good time to visit Castle Rock, with days averaging 17.4°C and nights around 1.9°C (mean 9.6°C, close to Castle Rock's yearly average) and low rainfall. July and August are marginally more temperate, but October still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.7°C | 11.8°C | 3.8°C | 28.4°C | -4.8°C | 12 mm | 46% | 2.3 m/s | 4.1 |
| 2024 🔥 | 22.3°C | 14.2°C | 6.1°C | 29.0°C | -3.6°C | 10 mm | 40% | 2.4 m/s | 4.2 |
| 2023 | 18.3°C | 10.4°C | 2.5°C | 26.2°C | -11.6°C | 20 mm | 48% | 2.1 m/s | 4.2 |
| 2022 | 17.7°C | 10.2°C | 2.8°C | 23.3°C | -4.0°C | 14 mm | 46% | 2.1 m/s | 4.2 |
| 2021 | 18.4°C | 10.5°C | 2.7°C | 25.6°C | -4.2°C | 11 mm | 44% | 2.2 m/s | 4.3 |
| 2020 | 18.8°C | 10.1°C | 1.5°C | 27.8°C | -14.7°C | 12 mm | 38% | 2.3 m/s | 4.1 |
| 2019 | 14.3°C | 6.0°C | -2.2°C | 25.6°C | -15.7°C | 34 mm | 44% | 2.4 m/s | 4.1 |
| 2018 | 15.4°C | 8.4°C | 1.5°C | 27.8°C | -9.4°C | 38 mm | 56% | 2.3 m/s | 3.6 |
| 2017 | 17.4°C | 9.1°C | 0.9°C | 25.6°C | -5.8°C | 23 mm | 48% | 2.5 m/s | 4.1 |
| 2016 | 21.4°C | 13.2°C | 5.0°C | 27.2°C | -3.0°C | 7 mm | 39% | 2.2 m/s | 4.3 |
| 2015 | 19.7°C | 12.4°C | 5.0°C | 27.7°C | -2.9°C | 46 mm | 53% | 2 m/s | 3.8 |
| 2014 | 19.1°C | 11.4°C | 3.7°C | 26.5°C | -2.0°C | 31 mm | 51% | 2 m/s | 4.1 |
| 2013 | 14.9°C | 7.5°C | 0.2°C | 24.3°C | -4.9°C | 24 mm | 57% | 2.1 m/s | 4.2 |
| 2012 | 17.4°C | 9.3°C | 1.1°C | 25.6°C | -7.4°C | 19 mm | 46% | 2.4 m/s | 3.9 |
| 2011 | 17.4°C | 9.6°C | 1.7°C | 26.6°C | -9.4°C | 38 mm | 47% | 2.3 m/s | 4.2 |
| 2010 | 18.4°C | 11.1°C | 3.9°C | 25.8°C | -4.7°C | 26 mm | 47% | 2.4 m/s | 4.1 |
| 2009 | 12.8°C | 5.5°C | -1.8°C | 25.2°C | -10.4°C | 55 mm | 59% | 2.4 m/s | 3.5 |
| 2008 | 18.6°C | 10.4°C | 2.2°C | 24.8°C | -4.5°C | 23 mm | 44% | 2.4 m/s | 4.1 |
| 2007 | 18.6°C | 10.5°C | 2.4°C | 26.7°C | -8.4°C | 33 mm | 46% | 2.5 m/s | 4.1 |
| 2006 | 15.5°C | 8.2°C | 0.9°C | 25.6°C | -8.5°C | 63 mm | 57% | 2.4 m/s | 3.6 |
| 2005 | 18.0°C | 10.2°C | 2.4°C | 28.3°C | -5.5°C | 48 mm | 52% | 2.4 m/s | 3.8 |
| 2004 | 16.9°C | 9.7°C | 2.5°C | 23.4°C | -2.8°C | 40 mm | 55% | 2.5 m/s | 4 |
| 2003 | 20.9°C | 12.7°C | 4.4°C | 27.5°C | -4.6°C | 6 mm | 39% | 2.3 m/s | 4.3 |
| 2002 | 15.2°C | 7.4°C | -0.3°C | 24.2°C | -10.2°C | 30 mm | 51% | 2 m/s | 4 |
| 2001 | 18.8°C | 10.6°C | 2.5°C | 26.2°C | -4.4°C | 7 mm | 40% | 2.3 m/s | 4 |
| 2000 | 17.7°C | 9.9°C | 2.2°C | 26.8°C | -4.2°C | 19 mm | 51% | 2.3 m/s | 3.7 |
| 1999 | 19.4°C | 10.6°C | 1.8°C | 26.0°C | -7.4°C | 17 mm | 41% | 2.2 m/s | 4.2 |
| 1998 | 16.8°C | 9.6°C | 2.4°C | 25.7°C | -2.3°C | 31 mm | 52% | 2.1 m/s | 3.9 |
| 1997 | 17.0°C | 9.0°C | 1.1°C | 28.7°C | -16.6°C | 56 mm | 51% | 2.7 m/s | 4 |
| 1996 | 17.0°C | 9.5°C | 1.9°C | 27.0°C | -6.5°C | 18 mm | 47% | 2.5 m/s | 4 |
| 1995 | 17.3°C | 9.1°C | 0.8°C | 25.7°C | -4.8°C | 15 mm | 42% | 2.3 m/s | 4.2 |
| 1994 | 16.4°C | 9.1°C | 1.8°C | 23.2°C | -3.8°C | 38 mm | 51% | 2.2 m/s | 4.2 |
| 1993 | 15.1°C | 7.9°C | 0.7°C | 25.9°C | -11.8°C | 47 mm | 52% | 2 m/s | 3.7 |
| 1992 | 18.8°C | 11.2°C | 3.6°C | 25.6°C | -3.9°C | 17 mm | 45% | 2.1 m/s | 3.9 |
| 1991 | 17.7°C | 9.8°C | 1.8°C | 27.2°C | -10.8°C | 17 mm | 42% | 2.4 m/s | 4 |
| 1990 | 17.9°C | 9.5°C | 1.1°C | 26.8°C | -8.3°C | 34 mm | 47% | 2.5 m/s | 4 |
| 1989 | 17.1°C | 9.3°C | 1.5°C | 26.5°C | -6.0°C | 17 mm | 42% | 2.5 m/s | 4.1 |
| 1988 | 19.3°C | 11.6°C | 3.9°C | 23.9°C | -0.3°C | 5 mm | 46% | 2.2 m/s | 3.8 |
| 1987 | 18.7°C | 10.5°C | 2.3°C | 26.0°C | -4.3°C | 33 mm | 45% | 2.1 m/s | 4.2 |
| 1986 | 14.8°C | 7.7°C | 0.6°C | 22.4°C | -9.7°C | 55 mm | 57% | 2.2 m/s | 3.7 |
| 1985 | 16.5°C | 8.7°C | 1.0°C | 23.3°C | -3.5°C | 27 mm | 51% | 2.3 m/s | 4.3 |
| 1984 ❄️ 🌧️ | 11.8°C | 5.4°C | -0.9°C | 21.4°C | -10.7°C | 102 mm | 67% | 2.3 m/s | 3 |
| 1983 | 17.6°C | 10.0°C | 2.5°C | 22.7°C | -3.0°C | 7 mm | 48% | 2.1 m/s | — |
| 1982 | 15.4°C | 7.8°C | 0.2°C | 24.3°C | -4.5°C | 28 mm | 49% | 2.3 m/s | — |
| 1981 | 16.7°C | 9.1°C | 1.6°C | 25.7°C | -5.6°C | 27 mm | 51% | 2.3 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 17.4°C with lows near 1.9°C (mean 9.6°C), based on 45 years of NASA POWER data.
October averages 29 mm of rainfall in Castle Rock, about average for rainfall. The wettest on record was 102 mm in 1984.
The hottest October reached 29°C in 2024. The coldest dipped to -16.6°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 3.2°C. Daytime highs moved from 15.6°C to 19.3°C and overnight lows from 0.9°C to 3.6°C over the same span.
October is close to Castle Rock's year-round average and about average for rainfall, so plan for around 17.4°C daytime highs and 1.9°C at night.
Not quite — October is the 7th coolest month in Castle Rock, averaging 9.6°C.
For October in Castle Rock, pack warm layers and a jacket for chilly mornings, with typical highs of 17.4°C and lows of 1.9°C.
Relative humidity in October averages 48% — relatively dry.
Average wind speed in October is 2.3 m/s. The windiest October on record averaged 2.7 m/s (1997).
The wettest October on record was 1984 with 102 mm. On average, October sees 29 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Castle Rock behaves each October, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for October specifically, along with year-by-year records and how the month has changed over the decades.
