July
July · August · September
70climate match
United States · 1991–2020
Best time to visit
Garrison.
July leads for comfortable weather in Garrison: typically 27.3°C by day, 6.4°C at night, with 39 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortJuly
Typical high27.3°C
Typical low6.4°C
Rain in July39 mm
July
July · August · June
50climate match
September
September · June · May
78climate match
The weakest month is January, scoring 5 against July’s 70 — days reach only 1.7°C, 22° below the 24°C the score treats as ideal, and nights drop to -12.1°C.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
51.7° / -12.1°
Feb
52.9° / -11.3°
Mar
88.4° / -7.4°
Apr
2812.7° / -3.9°
May
4717.7° / 0.4°
Jun
6622.2° / 3.8°
Jul
7027.3° / 6.4°
Aug
7027.2° / 5°
Sep
6721.8° / 1.1°
Oct
3314.1° / -3.8°
Nov
56° / -9°
Dec
51° / -12.3°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 1.7°C | -12.1°C | 7 mm | 2.5 | 8 h 57 | 5 | Good coverage |
| February | 2.9°C | -11.3°C | 15 mm | 3.7 | 10 h 14 | 5 | Good coverage |
| March | 8.4°C | -7.4°C | 14 mm | 3 | 11 h 45 | 8 | Good coverage |
| April | 12.7°C | -3.9°C | 25 mm | 4.4 | 13 h 30 | 28 | Good coverage |
| May | 17.7°C | 0.4°C | 46 mm | 7.4 | 14 h 59 | 47 | Good coverage |
| June | 22.2°C | 3.8°C | 57 mm | 8.4 | 15 h 48 | 66 | Good coverage |
| July | 27.3°C | 6.4°C | 39 mm | 5.9 | 15 h 28 | 70 | Strong coverage |
| August | 27.2°C | 5°C | 30 mm | 4.6 | 14 h 11 | 70 | Strong coverage |
| September | 21.8°C | 1.1°C | 30 mm | 4.1 | 12 h 29 | 67 | Good coverage |
| October | 14.1°C | -3.8°C | 18 mm | 3.6 | 10 h 49 | 33 | Good coverage |
| November | 6°C | -9°C | 14 mm | 2.9 | 9 h 20 | 5 | Good coverage |
| December | 1°C | -12.3°C | 9 mm | 2.6 | 8 h 35 | 5 | Strong coverage |
What has changed
Garrison runs -0.1°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
+0.8
Feb
-3.0
Mar
+0.3
Apr
-0.9
May
-0.2
Jun
0.0
Jul
+1.0
Aug
+0.5
Sep
+1.3
Oct
-0.9
Nov
-0.5
Dec
+1.0
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 16.7°C26 Jan 2015 | -40.0°C14 Jan 2024 | 25 mm17 Jan 2023 | 43 mm1969 · driest 0 mm in 2009 | 63 |
| February | 20.6°C26 Feb 1995 | -38.3°C5 Feb 2014 | 28 mm25 Feb 2002 | 51 mm2021 · driest 0 mm in 1992 | 61 |
| March | 22.8°C31 Mar 2004 | -33.9°C3 Mar 2019 | 33 mm17 Mar 1992 | 42 mm1982 · driest 0 mm in 1994 | 58 |
| April | 28.3°C30 Apr 1992 | -22.2°C8 Apr 1982 | 25 mm2 Apr 2018 | 88 mm2018 · driest 0 mm in 1977 | 60 |
| May | 32.2°C31 May 2025 | -13.9°C2 May 1967 | 37 mm25 May 1980 | 150 mm1980 · driest 6 mm in 2006 | 60 |
| June | 35.6°C14 Jun 2021 | -5.6°C3 Jun 1987 | 34 mm4 Jun 2001 | 101 mm1963 · driest 5 mm in 2000 | 62 |
| July | 38.3°C15 Jul 2002 | -6.7°C26 Jul 1997 | 54 mm31 Jul 1997 | 108 mm1997 · driest 2 mm in 1998 | 61 |
| August | 37.8°C24 Aug 1969 | -7.2°C29 Aug 1995 | 23 mm28 Aug 1991 | 90 mm1993 · driest 0 mm in 1988 | 63 |
| September | 36.7°C4 Sep 2022 | -12.8°C29 Sep 1985 | 39 mm20 Sep 1968 | 110 mm1995 · driest 0 mm in 1994 | 62 |
| October | 30.6°C1 Oct 1992 | -26.1°C30 Oct 2006 | 20 mm13 Oct 1975 | 74 mm1975 · driest 0 mm in 1987 | 60 |
| November | 22.8°C12 Nov 1999 | -38.9°C13 Nov 1959 | 20 mm3 Nov 2015 | 29 mm2018 · driest 0 mm in 2003 | 63 |
| December | 18.9°C2 Dec 2021 | -40.0°C22 Dec 2022 | 23 mm7 Dec 2021 | 38 mm2021 · driest 0 mm in 1997 | 63 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | 0 | 2 |
| February | 0 | 0 | 25 | <1 | 2 |
| March | 0 | 0 | 26 | <1 | 2 |
| April | <1 | 0 | 23 | <1 | <1 |
| May | 4 | <1 | 13 | 1 | <1 |
| June | 9 | 2 | 5 | 1 | <1 |
| July | 20 | 8 | <1 | 1 | 0 |
| August | 21 | 9 | 2 | <1 | 0 |
| September | 10 | 2 | 12 | <1 | 0 |
| October | 1 | 0 | 22 | <1 | <1 |
| November | 0 | 0 | 25 | <1 | 1 |
| December | 0 | 0 | 26 | <1 | 2 |
The best month has moved. On the 1961–1990 numbers the strongest month here was July (scoring 74); on 2011–2025 it is June (74). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 11% | <1% | 6% | -2.6–4.0°C |
| February | <1% | 11% | <1% | 5% | -1.0–6.9°C |
| March | 2% | 11% | <1% | 7% | 3.6–10.8°C |
| April | 13% | 16% | 1% | 13% | 10.4–15.6°C |
| May | 31% | 25% | 4% | 27% | 15.1–19.9°C |
| June | 55% | 27% | 5% | 30% | 19.9–25.3°C |
| July | 80% | 17% | 3% | 13% | 25.6–30.1°C |
| August | 78% | 17% | 2% | 14% | 24.1–29.8°C |
| September | 57% | 16% | 3% | 13% | 18.1–25.0°C |
| October | 23% | 12% | 1% | 8% | 12.0–17.7°C |
| November | 1% | 11% | <1% | 7% | 3.1–8.2°C |
| December | 0% | 11% | <1% | 5% | -2.5–4.3°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
Nearby, measured,
and named.
- Place identity
- GeoNames 5653816
- NOAA station
- USC00242275 · DEER LODGE 3 W
- Station distance
- 14.8 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 20 usable years
- Daylight
- Calculated from latitude 46.52°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.