United States · 1991–2020

Best time to visit
Rimrock.

September leads for comfortable weather in Rimrock: typically 24.5°C by day, 7.7°C at night, with 35 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.5°C

Typical low7.7°C

Rain in September35 mm

Comfort

September

September · June · August

83climate match

Beach

August

August · July · June

71climate match

Outdoors

May

May · September · June

79climate match

The weakest month is January, scoring 5 against September’s 83 — days reach only 3.3°C, 21° below the 24°C the score treats as ideal, and nights drop to -8.8°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

53.3° / -8.8°

Feb

54.5° / -8.4°

Mar

2211° / -3.6°

Apr

4115.3° / 1°

May

6220.4° / 6.1°

Jun

7826.3° / 10.8°

Jul

7032.5° / 14.4°

Aug

7330.8° / 12.9°

Sep

8324.5° / 7.7°

Oct

4615.8° / 1.6°

Nov

159.1° / -4.4°

Dec

53.6° / -8.1°

Monthly climate evidence for Rimrock — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.3°C	-8.8°C	14 mm	3.7	9 h 02	5	Good coverage
February	4.5°C	-8.4°C	17 mm	4.8	10 h 17	5	Good coverage
March	11°C	-3.6°C	25 mm	4.7	11 h 46	22	Good coverage
April	15.3°C	1°C	44 mm	7	13 h 28	41	Good coverage
May	20.4°C	6.1°C	65 mm	9.3	14 h 54	62	Good coverage
June	26.3°C	10.8°C	50 mm	8	15 h 42	78	Good coverage
July	32.5°C	14.4°C	28 mm	4.5	15 h 23	70	Good coverage
August	30.8°C	12.9°C	22 mm	4.4	14 h 08	73	Good coverage
September	24.5°C	7.7°C	35 mm	5.2	12 h 29	83	Good coverage
October	15.8°C	1.6°C	38 mm	5.7	10 h 51	46	Good coverage
November	9.1°C	-4.4°C	15 mm	4.1	9 h 24	15	Good coverage
December	3.6°C	-8.1°C	16 mm	4	8 h 41	5	Good coverage

Records at BILLINGS WFO, 1999–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	19.4°C27 Jan 2015	-35.0°C13 Jan 2024	13 mm21 Jan 2019	30 mm2010 · driest 1 mm in 2006	27
February	21.7°C27 Feb 2006	-33.3°C19 Feb 2025	17 mm25 Feb 2000	49 mm2014 · driest 2 mm in 2016	28
March	30.0°C20 Mar 2026	-29.4°C2 Mar 2014	29 mm29 Mar 2006	57 mm2006 · driest 4 mm in 2004	28
April	32.2°C23 Apr 2012	-18.9°C2 Apr 2002	32 mm18 Apr 2002	98 mm2025 · driest 6 mm in 2008	28
May	37.2°C13 May 2026	-5.0°C2 May 2005	63 mm23 May 2024	198 mm2011 · driest 12 mm in 2001	28
June	42.2°C15 Jun 2021	0.6°C11 Jun 2008	53 mm13 Jun 2001	179 mm2023 · driest 6 mm in 2021	28
July	43.9°C19 Jul 2021	5.0°C16 Jul 1999	62 mm7 Jul 2007	72 mm2004 · driest 0 mm in 2003	28
August	41.1°C2 Aug 2024	2.2°C23 Aug 2015	30 mm30 Aug 2010	83 mm2010 · driest 0 mm in 2001	27
September	41.7°C7 Sep 2022	-3.3°C24 Sep 2000	32 mm18 Sep 2024	83 mm2013 · driest 0 mm in 2012	27
October	33.9°C1 Oct 2011	-16.7°C29 Oct 2019	36 mm3 Oct 2013	76 mm2016 · driest 3 mm in 1999	26
November	26.1°C5 Nov 2020	-27.2°C24 Nov 2010	15 mm9 Nov 2006	44 mm2010 · driest 1 mm in 2023	26
December	23.3°C2 Dec 2021	-32.2°C23 Dec 2022	24 mm2 Dec 2013	49 mm2013 · driest 4 mm in 2019	25

Typical days per month at BILLINGS WFO, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	<1	6
February	0	0	27	<1	7
March	<1	0	23	<1	5
April	2	<1	12	1	3
May	9	2	3	2	<1
June	19	8	0	1	0
July	30	24	0	<1	0
August	28	20	0	<1	0
September	16	8	<1	1	<1
October	3	<1	11	1	2
November	<1	0	24	<1	4
December	0	0	29	<1	6

How often, not how much — every day in BILLINGS WFO’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	0%	11%	<1%	7%	0.8–6.0°C
February	<1%	18%	<1%	14%	-2.3–9.3°C
March	11%	16%	2%	15%	6.8–15.2°C
April	27%	24%	4%	21%	13.3–17.6°C
May	47%	30%	5%	41%	18.4–23.5°C
June	71%	26%	5%	26%	24.4–28.9°C
July	85%	15%	2%	8%	30.6–35.3°C
August	86%	14%	2%	11%	29.0–33.3°C
September	74%	16%	3%	18%	23.0–28.4°C
October	31%	18%	4%	14%	12.6–19.1°C
November	6%	12%	<1%	7%	5.3–12.3°C
December	<1%	13%	<1%	9%	-0.3–7.9°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.

2000Each stripe is one year’s mean temperature against the 23-year average. Warmest: 2024. Coolest: 2019.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5673940
NOAA station: USC00240801 · BILLINGS WFO
Station distance: 11.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 20 usable years
Daylight: Calculated from latitude 45.80°, 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.

These places read the same station, so their numbers are identical — distance from BILLINGS WFO is what differs

Laurel→Baseline→Mossmain→Yegen→Hesper→

Or put two places side by side: Rimrock vs Laurel

Best time to visitRimrock.

September

August

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Rimrock.

The whole year,
without the guesswork.

Nearby, measured,
and named.