June is one of the warmer months of the year in Castle Rock, with average highs near 27.3°C and lows around 10.4°C (mean 18.9°C). It is about average for rainfall, averaging 48 mm of rainfall and 43% relative humidity across the period.
June is one of the warmer months of the year in Castle Rock. Across 45 years of records, the warmest June in Castle Rock was 2012 — when the month averaged 22.4°C — while the coldest was 1983 at 15.4°C. Typical June days reach 27.3°C with nights near 10.4°C. The long-term trend is warming, about 0.5°C per decade.
June is about average for rainfall in Castle Rock, averaging 48 mm of rainfall. The wettest June on record was 2023 with 127 mm, while the driest was 1990 at 12 mm.
Relative humidity in Castle Rock during June averages 43%. The most humid June was 2023 at 58%, and the least humid was 2012 at 30%.
June receives about 7.1 kWh/m²/day of solar energy in Castle Rock. The sunniest June was 2012 at 7.8 kWh/m²/day, and the cloudiest was 1984 at 6.1.
Average wind speed in Castle Rock during June is 2.5 m/s. The windiest June was 2012 at 2.9 m/s, while the calmest was 2023 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.9°C | 18.2°C | 18.8°C | 19.9°C | 19.7°C | +1.8°C |
| Avg High | 26.0°C | 26.6°C | 27.4°C | 28.6°C | 28.1°C | +2.1°C |
| Avg Low | 9.8°C | 9.8°C | 10.2°C | 11.1°C | 11.4°C | +1.6°C |
| Avg Rain | 55 mm | 51 mm | 45 mm | 39 mm | 53 mm | -2 mm |
June temperatures in Castle Rock have risen by about 2.3°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 0.6°C (2001) to a record high of 36.9°C (2012).
Rainfall in June is about average for rainfall, averaging 48 mm, with a wettest year of 127 mm.
One of the best times to visit Castle Rock
June is one of the best times to visit Castle Rock. Expect days averaging 27.3°C and nights around 10.4°C (mean 18.9°C) — warmer than Castle Rock's yearly average — with moderate rainfall (48 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 | 28.7°C | 20.0°C | 11.2°C | 35.4°C | 5.0°C | 62 mm | 43% | 2.5 m/s | 7 |
| 2024 | 30.5°C | 21.8°C | 13.2°C | 34.6°C | 8.1°C | 22 mm | 40% | 2.6 m/s | 7.3 |
| 2023 🌧️ | 23.2°C | 16.2°C | 9.2°C | 31.2°C | 5.9°C | 127 mm | 58% | 1.9 m/s | 6.4 |
| 2022 | 28.4°C | 19.9°C | 11.3°C | 35.3°C | 2.2°C | 21 mm | 39% | 2.5 m/s | 6.9 |
| 2021 | 29.0°C | 20.6°C | 12.3°C | 36.0°C | 3.3°C | 42 mm | 42% | 2.6 m/s | 7.2 |
| 2020 | 28.5°C | 19.8°C | 11.0°C | 33.5°C | 1.2°C | 43 mm | 38% | 2.8 m/s | 7.3 |
| 2019 | 25.6°C | 17.4°C | 9.3°C | 33.7°C | 4.0°C | 54 mm | 49% | 2.2 m/s | 6.7 |
| 2018 | 30.4°C | 21.4°C | 12.3°C | 36.6°C | 5.6°C | 24 mm | 33% | 2.4 m/s | 7.1 |
| 2017 | 28.5°C | 19.8°C | 11.2°C | 34.2°C | 7.1°C | 13 mm | 42% | 2.4 m/s | 7.3 |
| 2016 | 28.7°C | 20.5°C | 12.4°C | 35.1°C | 6.1°C | 55 mm | 46% | 2.3 m/s | 7.4 |
| 2015 | 26.8°C | 19.2°C | 11.5°C | 33.4°C | 7.3°C | 80 mm | 55% | 2.1 m/s | 7.1 |
| 2014 | 27.8°C | 18.7°C | 9.5°C | 33.1°C | 3.1°C | 33 mm | 41% | 2.5 m/s | 7.4 |
| 2013 | 29.6°C | 20.4°C | 11.2°C | 34.7°C | 3.5°C | 19 mm | 34% | 2.5 m/s | 7.5 |
| 2012 🔥 | 31.6°C | 22.4°C | 13.1°C | 36.9°C | 6.8°C | 22 mm | 30% | 2.9 m/s | 7.8 |
| 2011 | 28.7°C | 19.4°C | 10.2°C | 34.1°C | 5.1°C | 37 mm | 36% | 2.6 m/s | 7.4 |
| 2010 | 28.4°C | 19.5°C | 10.7°C | 34.4°C | 4.3°C | 49 mm | 42% | 2.4 m/s | 7.1 |
| 2009 | 24.2°C | 16.5°C | 8.9°C | 30.9°C | 3.5°C | 83 mm | 53% | 2.2 m/s | 6.7 |
| 2008 | 27.7°C | 18.6°C | 9.5°C | 32.5°C | 2.5°C | 17 mm | 35% | 2.4 m/s | 7.3 |
| 2007 | 27.3°C | 18.8°C | 10.4°C | 34.6°C | 1.1°C | 23 mm | 42% | 2.8 m/s | 7.5 |
| 2006 | 29.8°C | 21.1°C | 12.4°C | 34.7°C | 8.7°C | 16 mm | 34% | 2.7 m/s | 7.6 |
| 2005 | 26.8°C | 18.2°C | 9.6°C | 32.7°C | 2.7°C | 65 mm | 43% | 2.4 m/s | 7.3 |
| 2004 | 25.8°C | 17.6°C | 9.4°C | 34.3°C | 4.2°C | 90 mm | 47% | 2.2 m/s | 6.3 |
| 2003 | 24.8°C | 16.6°C | 8.4°C | 31.0°C | 1.3°C | 64 mm | 50% | 2.3 m/s | 7 |
| 2002 | 30.7°C | 21.5°C | 12.4°C | 34.7°C | 5.8°C | 30 mm | 32% | 2.7 m/s | 7.5 |
| 2001 | 29.1°C | 19.9°C | 10.6°C | 34.3°C | 0.6°C | 29 mm | 36% | 2.5 m/s | 7.5 |
| 2000 | 27.7°C | 18.9°C | 10.2°C | 33.1°C | 4.0°C | 30 mm | 39% | 2.8 m/s | 7 |
| 1999 | 25.7°C | 17.2°C | 8.8°C | 30.8°C | 4.0°C | 41 mm | 45% | 2.6 m/s | 7.4 |
| 1998 | 26.0°C | 17.0°C | 8.0°C | 33.8°C | 1.5°C | 31 mm | 40% | 2.5 m/s | 7.4 |
| 1997 | 26.6°C | 18.7°C | 10.7°C | 32.8°C | 7.2°C | 80 mm | 49% | 2.2 m/s | 7.2 |
| 1996 | 26.7°C | 18.7°C | 10.6°C | 32.6°C | 4.0°C | 50 mm | 44% | 2.4 m/s | 6.7 |
| 1995 | 23.1°C | 15.6°C | 8.1°C | 30.0°C | 2.3°C | 99 mm | 55% | 2.4 m/s | 6.4 |
| 1994 | 29.6°C | 20.7°C | 11.8°C | 36.5°C | 7.1°C | 40 mm | 37% | 2.4 m/s | 7.6 |
| 1993 | 26.1°C | 17.5°C | 8.9°C | 33.4°C | 2.0°C | 49 mm | 43% | 2.3 m/s | 7.1 |
| 1992 | 24.8°C | 16.9°C | 9.0°C | 31.5°C | 2.7°C | 59 mm | 50% | 2.4 m/s | 6.5 |
| 1991 | 27.3°C | 19.0°C | 10.6°C | 33.9°C | 5.3°C | 50 mm | 42% | 2.8 m/s | 6.8 |
| 1990 | 30.3°C | 20.7°C | 11.1°C | 36.7°C | 2.8°C | 12 mm | 32% | 2.8 m/s | 7.4 |
| 1989 | 24.0°C | 16.1°C | 8.2°C | 35.3°C | 1.6°C | 60 mm | 48% | 2.3 m/s | 6.5 |
| 1988 | 27.7°C | 20.0°C | 12.4°C | 33.6°C | 2.7°C | 50 mm | 47% | 2.7 m/s | 6.7 |
| 1987 | 27.0°C | 18.9°C | 10.8°C | 31.4°C | 3.0°C | 68 mm | 47% | 2.2 m/s | 7.1 |
| 1986 | 26.8°C | 19.0°C | 11.2°C | 33.5°C | 4.3°C | 51 mm | 45% | 2.5 m/s | 6.5 |
| 1985 | 27.2°C | 18.2°C | 9.3°C | 34.2°C | 3.3°C | 34 mm | 39% | 2.3 m/s | 7 |
| 1984 | 25.7°C | 17.5°C | 9.2°C | 32.8°C | 1.6°C | 48 mm | 46% | 2.4 m/s | 6.1 |
| 1983 ❄️ | 23.2°C | 15.4°C | 7.7°C | 32.6°C | 1.5°C | 75 mm | 53% | 2.3 m/s | — |
| 1982 | 23.9°C | 15.9°C | 7.9°C | 32.0°C | 2.6°C | 69 mm | 49% | 2.4 m/s | — |
| 1981 | 28.7°C | 20.0°C | 11.2°C | 34.6°C | 2.7°C | 42 mm | 41% | 2.5 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 27.3°C with lows near 10.4°C (mean 18.9°C), based on 45 years of NASA POWER data.
June averages 48 mm of rainfall in Castle Rock, about average for rainfall. The wettest on record was 127 mm in 2023.
The hottest June reached 36.9°C in 2012. The coldest dipped to 0.6°C in 2001.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2.3°C. Daytime highs moved from 25.7°C to 28°C and overnight lows from 9.1°C to 11.4°C over the same span.
June is one of the warmer months of the year in Castle Rock and about average for rainfall, so plan for around 27.3°C daytime highs and 10.4°C at night.
Not quite — June is the 10th coolest month in Castle Rock, averaging 18.9°C.
For June in Castle Rock, pack light layers you can adjust through the day, with typical highs of 27.3°C and lows of 10.4°C.
Relative humidity in June averages 43% — relatively dry.
Average wind speed in June is 2.5 m/s. The windiest June on record averaged 2.9 m/s (2012).
The wettest June on record was 2023 with 127 mm. On average, June sees 48 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 June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
