July is one of the warmer months of the year in Castle Rock, with average highs near 29.8°C and lows around 14.1°C (mean 22°C). It is a relatively wet time of year, averaging 62 mm of rainfall and 45% relative humidity across the period.
July is one of the warmer months of the year in Castle Rock. Across 45 years of records, the warmest July in Castle Rock was 2003 — when the month averaged 24.4°C — while the coldest were 1992 and 1995 at 19.9°C. Typical July days reach 29.8°C with nights near 14.1°C. The long-term trend is warming, about 0.4°C per decade.
July is a relatively wet time of year in Castle Rock, averaging 62 mm of rainfall. The wettest July on record was 1998 with 119 mm, while the driest was 2005 at 20 mm.
Relative humidity in Castle Rock during July averages 45%. The most humid July was 2015 at 55%, and the least humid was 2002 at 35%.
July receives about 6.9 kWh/m²/day of solar energy in Castle Rock. The sunniest July was 2002 at 7.6 kWh/m²/day, and the cloudiest was 1992 at 6.3.
Average wind speed in Castle Rock during July is 2.3 m/s. The windiest July was 1989 at 2.7 m/s, while the calmest were 1992 and 1995 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.4°C | 20.9°C | 22.7°C | 22.2°C | 22.8°C | +1.4°C |
| Avg High | 29.2°C | 28.7°C | 30.7°C | 29.9°C | 30.9°C | +1.7°C |
| Avg Low | 13.6°C | 13.1°C | 14.7°C | 14.6°C | 14.7°C | +1.1°C |
| Avg Rain | 60 mm | 69 mm | 56 mm | 71 mm | 52 mm | -8 mm |
July temperatures in Castle Rock have risen by about 1.5°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 5.9°C (1995) to a record high of 37.1°C (2005).
Rainfall in July is a relatively wet time of year, averaging 62 mm, with a wettest year of 119 mm.
One of the best times to visit Castle Rock
July is one of the best times to visit Castle Rock. Expect days averaging 29.8°C and nights around 14.1°C (mean 22°C) — warmer than Castle Rock's yearly average — with moderate rainfall (62 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 31.6°C | 23.2°C | 14.7°C | 36.0°C | 11.6°C | 43 mm | 38% | 2.4 m/s | 6.7 |
| 2024 | 30.8°C | 22.4°C | 14.0°C | 36.5°C | 9.4°C | 35 mm | 38% | 2.3 m/s | 7.3 |
| 2023 | 30.8°C | 22.5°C | 14.2°C | 35.5°C | 9.5°C | 58 mm | 46% | 2.3 m/s | 7.2 |
| 2022 | 31.2°C | 23.2°C | 15.3°C | 35.8°C | 11.8°C | 69 mm | 45% | 2.3 m/s | 6.8 |
| 2021 | 29.9°C | 22.6°C | 15.2°C | 35.2°C | 11.7°C | 66 mm | 48% | 2.4 m/s | 7 |
| 2020 | 31.0°C | 22.8°C | 14.6°C | 35.6°C | 9.6°C | 38 mm | 41% | 2.6 m/s | 6.8 |
| 2019 | 30.3°C | 22.6°C | 14.8°C | 35.9°C | 9.8°C | 70 mm | 48% | 2.2 m/s | 7.2 |
| 2018 | 30.5°C | 22.7°C | 14.9°C | 34.9°C | 9.8°C | 63 mm | 47% | 2.5 m/s | 7.1 |
| 2017 | 29.7°C | 22.3°C | 15.0°C | 34.7°C | 10.3°C | 68 mm | 48% | 2.3 m/s | 6.7 |
| 2016 | 31.1°C | 23.0°C | 14.8°C | 34.8°C | 11.9°C | 31 mm | 41% | 2.3 m/s | 7.3 |
| 2015 | 27.3°C | 20.0°C | 12.8°C | 31.8°C | 8.4°C | 62 mm | 55% | 2.1 m/s | 6.6 |
| 2014 | 28.6°C | 21.4°C | 14.3°C | 34.4°C | 8.7°C | 111 mm | 51% | 2.4 m/s | 6.4 |
| 2013 | 29.1°C | 21.5°C | 14.0°C | 35.0°C | 10.6°C | 62 mm | 48% | 2.5 m/s | 6.8 |
| 2012 | 30.9°C | 23.3°C | 15.7°C | 35.2°C | 12.8°C | 81 mm | 45% | 2.5 m/s | 7.1 |
| 2011 | 31.2°C | 23.1°C | 14.9°C | 34.5°C | 10.4°C | 87 mm | 48% | 2.1 m/s | 7.1 |
| 2010 | 29.8°C | 22.1°C | 14.3°C | 35.3°C | 7.7°C | 70 mm | 47% | 2.2 m/s | 6.9 |
| 2009 | 28.5°C | 20.5°C | 12.6°C | 32.8°C | 8.2°C | 92 mm | 51% | 2.2 m/s | 6.8 |
| 2008 | 31.1°C | 23.1°C | 15.0°C | 34.4°C | 11.4°C | 25 mm | 36% | 2.5 m/s | 7.2 |
| 2007 | 30.2°C | 22.8°C | 15.4°C | 35.1°C | 12.3°C | 51 mm | 44% | 2.5 m/s | 7.2 |
| 2006 | 29.6°C | 22.2°C | 14.9°C | 35.8°C | 8.7°C | 100 mm | 48% | 2.5 m/s | 6.8 |
| 2005 | 32.4°C | 23.8°C | 15.2°C | 37.1°C | 10.0°C | 20 mm | 36% | 2.5 m/s | 7.2 |
| 2004 | 28.0°C | 20.2°C | 12.4°C | 34.3°C | 7.6°C | 80 mm | 49% | 2.2 m/s | 6.7 |
| 2003 🔥 | 32.9°C | 24.4°C | 16.0°C | 36.4°C | 12.1°C | 33 mm | 35% | 2.4 m/s | 7.5 |
| 2002 | 31.9°C | 23.8°C | 15.7°C | 36.2°C | 12.5°C | 27 mm | 35% | 2.4 m/s | 7.6 |
| 2001 | 31.1°C | 23.3°C | 15.5°C | 35.5°C | 12.2°C | 70 mm | 43% | 2.3 m/s | 6.9 |
| 2000 | 31.0°C | 22.8°C | 14.7°C | 35.1°C | 10.7°C | 56 mm | 40% | 2.4 m/s | 7.3 |
| 1999 | 28.7°C | 21.6°C | 14.5°C | 34.2°C | 10.0°C | 75 mm | 49% | 2.4 m/s | 7 |
| 1998 🌧️ | 28.9°C | 21.7°C | 14.5°C | 35.6°C | 11.4°C | 119 mm | 51% | 2.1 m/s | 7.1 |
| 1997 | 29.4°C | 21.4°C | 13.4°C | 34.5°C | 7.0°C | 76 mm | 42% | 2.4 m/s | 7.4 |
| 1996 | 29.2°C | 21.6°C | 14.0°C | 33.5°C | 11.3°C | 61 mm | 47% | 2.2 m/s | 6.8 |
| 1995 | 27.9°C | 19.9°C | 12.0°C | 35.6°C | 5.9°C | 47 mm | 48% | 2 m/s | 7 |
| 1994 | 29.9°C | 21.5°C | 13.1°C | 34.0°C | 7.4°C | 27 mm | 41% | 2.2 m/s | 6.6 |
| 1993 | 30.0°C | 21.1°C | 12.2°C | 33.7°C | 7.1°C | 35 mm | 41% | 2.6 m/s | 7.1 |
| 1992 ❄️ | 27.8°C | 19.9°C | 12.1°C | 34.4°C | 8.7°C | 52 mm | 47% | 2 m/s | 6.3 |
| 1991 | 27.9°C | 20.4°C | 12.9°C | 34.2°C | 8.6°C | 96 mm | 50% | 2.2 m/s | 6.6 |
| 1990 | 27.6°C | 20.1°C | 12.7°C | 36.6°C | 7.8°C | 98 mm | 51% | 2.4 m/s | 6.4 |
| 1989 | 29.8°C | 21.9°C | 14.0°C | 36.1°C | 11.5°C | 59 mm | 40% | 2.7 m/s | 7.2 |
| 1988 | 29.8°C | 21.9°C | 13.9°C | 35.6°C | 8.9°C | 38 mm | 43% | 2.4 m/s | 6.4 |
| 1987 | 30.1°C | 21.7°C | 13.3°C | 33.8°C | 6.8°C | 37 mm | 41% | 2.4 m/s | 7.1 |
| 1986 | 29.1°C | 21.1°C | 13.1°C | 33.1°C | 11.3°C | 56 mm | 42% | 2.1 m/s | 6.5 |
| 1985 | 27.9°C | 20.7°C | 13.5°C | 34.1°C | 11.2°C | 98 mm | 49% | 2.3 m/s | 6.4 |
| 1984 | 29.1°C | 21.6°C | 14.0°C | 34.7°C | 10.9°C | 63 mm | 47% | 2.3 m/s | 6.9 |
| 1983 | 28.9°C | 21.1°C | 13.2°C | 33.9°C | 7.3°C | 76 mm | 49% | 2.4 m/s | — |
| 1982 | 29.2°C | 21.3°C | 13.5°C | 34.9°C | 8.6°C | 50 mm | 41% | 2.3 m/s | — |
| 1981 | 29.2°C | 21.6°C | 14.1°C | 35.3°C | 10.6°C | 63 mm | 47% | 2.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 29.8°C with lows near 14.1°C (mean 22°C), based on 45 years of NASA POWER data.
July averages 62 mm of rainfall in Castle Rock, a relatively wet time of year. The wettest on record was 119 mm in 1998.
The hottest July reached 37.1°C in 2005. The coldest dipped to 5.9°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.5°C. Daytime highs moved from 28.9°C to 30.9°C and overnight lows from 13.7°C to 14.7°C over the same span.
July is one of the warmer months of the year in Castle Rock and a relatively wet time of year, so plan for around 29.8°C daytime highs and 14.1°C at night.
Not quite — July is the 12th coolest month in Castle Rock, averaging 22°C.
For July in Castle Rock, pack light layers you can adjust through the day, with typical highs of 29.8°C and lows of 14.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 45% — relatively dry.
Average wind speed in July is 2.3 m/s. The windiest July on record averaged 2.7 m/s (1989).
The wettest July on record was 1998 with 119 mm. On average, July sees 62 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 July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
