June
June · September · August
United States · 1991–2020
June leads for comfortable weather in Mount Shasta: typically 25.5°C by day, 8.6°C at night, with 25 mm of rain. Based on measured 1991–2020 NOAA station history.
June · September · August
July · August · June
May · June · October
The weakest month is January, scoring 5 against June’s 84 — days reach only 7.3°C, 17° below the 24°C the score treats as ideal.
Month by month
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 7.3°C | -2.1°C | 134 mm | 9.6 | 9 h 30 | 5 | Good coverage |
| February | 8.7°C | -1.7°C | 160 mm | 9.9 | 10 h 33 | 5 | Good coverage |
| March | 11.7°C | -0.2°C | 135 mm | 10.2 | 11 h 48 | 12 | Good coverage |
| April | 15.4°C | 1.7°C | 76 mm | 7.8 | 13 h 15 | 37 | Good coverage |
| May | 20.8°C | 5.2°C | 52 mm | 6.3 | 14 h 28 | 66 | Good coverage |
| June | 25.5°C | 8.6°C | 25 mm | 2.7 | 15 h 08 | 84 | Good coverage |
| July | 30.7°C | 11°C | 7 mm | 1 | 14 h 53 | 71 | Good coverage |
| August | 29.9°C | 10.1°C | 4 mm | 1 | 13 h 50 | 72 | Good coverage |
| September | 26.1°C | 7°C | 14 mm | 2.1 | 12 h 25 | 79 | Good coverage |
| October | 18.6°C | 3°C | 58 mm | 4.7 | 11 h 01 | 56 | Good coverage |
| November | 10.9°C | -0.2°C | 100 mm | 8.3 | 9 h 48 | 16 | Good coverage |
| December | 6.5°C | -2.4°C | 160 mm | 10.5 | 9 h 12 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 20.0°C6 Jan 2015 | -16.0°C6 Jan 2017 | 74 mm8 Jan 2017 | 426 mm2023 · driest 5 mm in 2014 | 30 |
| February | 21.7°C27 Feb 2025 | -14.3°C12 Feb 2025 | 124 mm6 Feb 2015 | 397 mm2019 · driest 2 mm in 2022 | 30 |
| March | 28.3°C17 Mar 2026 | -9.4°C8 Mar 2002 | 85 mm1 Mar 2009 | 381 mm2011 · driest 3 mm in 2026 | 30 |
| April | 30.6°C21 Apr 2009 | -7.7°C20 Apr 2008 | 86 mm6 Apr 2017 | 222 mm2003 · driest 3 mm in 2025 | 30 |
| May | 35.0°C17 May 2008 | -5.5°C9 May 2022 | 54 mm15 May 2019 | 186 mm1998 · driest 3 mm in 2001 | 30 |
| June | 39.4°C27 Jun 2021 | -0.5°C10 Jun 2017 | 48 mm17 Jun 2005 | 91 mm2005 · driest 0 mm in 2024 | 30 |
| July | 41.1°C29 Jul 2022 | 2.8°C1 Jul 1997 | 30 mm5 Jul 2000 | 43 mm2000 · driest 0 mm in 2006 | 30 |
| August | 38.9°C14 Aug 2023 | 2.8°C5 Aug 2002 | 18 mm2 Aug 2022 | 29 mm2022 · driest 0 mm in 2011 | 30 |
| September | 39.4°C6 Sep 2022 | -1.1°C25 Sep 2005 | 30 mm24 Sep 2014 | 65 mm2014 · driest 0 mm in 2008 | 30 |
| October | 31.7°C13 Oct 2015 | -8.2°C30 Oct 2019 | 90 mm19 Oct 2004 | 302 mm2016 · driest 0 mm in 2020 | 30 |
| November | 25.6°C1 Nov 2020 | -11.6°C28 Nov 2015 | 108 mm21 Nov 2024 | 271 mm1998 · driest 6 mm in 2013 | 30 |
| December | 18.9°C13 Dec 2025 | -17.8°C21 Dec 1998 | 103 mm11 Dec 2014 | 443 mm2002 · driest 6 mm in 2013 | 30 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 23 | 4 |
| February | 0 | 0 | 21 | 5 |
| March | <1 | 0 | 18 | 4 |
| April | 2 | 0 | 11 | 3 |
| May | 9 | 2 | 2 | 2 |
| June | 18 | 7 | <1 | <1 |
| July | 29 | 19 | 0 | <1 |
| August | 29 | 18 | 0 | 0 |
| September | 19 | 8 | <1 | <1 |
| October | 4 | <1 | 6 | 2 |
| November | <1 | 0 | 18 | 3 |
| December | 0 | 0 | 24 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 31% | 15% | 42% | 5.4–10.1°C |
| February | 1% | 34% | 15% | 48% | 5.1–12.5°C |
| March | 11% | 33% | 13% | 41% | 7.9–15.6°C |
| April | 30% | 25% | 8% | 28% | 13.3–18.9°C |
| May | 58% | 19% | 5% | 21% | 18.5–23.2°C |
| June | 83% | 9% | 2% | 6% | 23.4–28.1°C |
| July | 96% | 4% | <1% | <1% | 28.7–33.3°C |
| August | 96% | 4% | <1% | <1% | 28.7–32.3°C |
| September | 84% | 8% | 1% | 7% | 23.9–28.1°C |
| October | 45% | 15% | 5% | 18% | 16.2–21.4°C |
| November | 4% | 28% | 11% | 35% | 8.0–13.1°C |
| December | 0% | 35% | 16% | 48% | 4.4–9.1°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page