United States · 1991–2020

Best time to visit
Columbine Valley.

September leads for comfortable weather in Columbine Valley: typically 25.7°C by day, 9.5°C at night, with 32 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.7°C

Typical low9.5°C

Rain in September32 mm

Comfort

September

September · June · August

83climate match

Beach

August

August · July · June

75climate match

Outdoors

May

May · October · September

81climate match

The weakest month is December, scoring 6 against September’s 83 — days reach only 7.4°C, 17° below the 24°C the score treats as ideal, and nights drop to -6.9°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

88° / -6.9°

Feb

88.1° / -6.7°

Mar

3212.8° / -2°

Apr

4516.1° / 1.5°

May

6520.6° / 6.4°

Jun

7927.5° / 11.9°

Jul

7031.1° / 15.8°

Aug

7629.6° / 14.3°

Sep

8325.7° / 9.5°

Oct

5818.2° / 2.8°

Nov

3312.9° / -2°

Dec

67.4° / -6.9°

Monthly climate evidence for Columbine Valley — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	8°C	-6.9°C	13 mm	3.1	9 h 39	8	Good coverage
February	8.1°C	-6.7°C	17 mm	3.4	10 h 38	8	Good coverage
March	12.8°C	-2°C	29 mm	4.1	11 h 49	32	Good coverage
April	16.1°C	1.5°C	50 mm	5.8	13 h 11	45	Good coverage
May	20.6°C	6.4°C	70 mm	7.5	14 h 20	65	Good coverage
June	27.5°C	11.9°C	44 mm	5.9	14 h 57	79	Good coverage
July	31.1°C	15.8°C	53 mm	6.3	14 h 42	70	Good coverage
August	29.6°C	14.3°C	43 mm	6.3	13 h 43	76	Good coverage
September	25.7°C	9.5°C	32 mm	4.5	12 h 24	83	Good coverage
October	18.2°C	2.8°C	27 mm	3.8	11 h 05	58	Good coverage
November	12.9°C	-2°C	13 mm	2.6	9 h 56	33	Good coverage
December	7.4°C	-6.9°C	12 mm	2.7	9 h 23	6	Good coverage

Records at MARSTON FLTR PLT, 1998–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.2°C28 Jan 2015	-24.4°C16 Jan 2024	14 mm9 Jan 2026	43 mm2019 · driest 1 mm in 2003	28
February	25.0°C11 Feb 2017	-26.7°C2 Feb 2011	32 mm4 Feb 2024	53 mm2019 · driest 0 mm in 2026	28
March	30.0°C22 Mar 2026	-21.1°C2 Mar 2002	46 mm14 Mar 2024	80 mm2024 · driest 1 mm in 2012	28
April	28.9°C23 Apr 2022	-14.4°C10 Apr 2013	51 mm25 Apr 2007	119 mm1999 · driest 1 mm in 2002	26
May	35.6°C30 May 2000	-9.4°C1 May 2010	75 mm12 May 2023	178 mm2015 · driest 11 mm in 2006	29
June	37.8°C29 Jun 2018	-0.6°C1 Jun 2005	36 mm7 Jun 2012	143 mm2023 · driest 7 mm in 2024	29
July	38.9°C21 Jul 2005	9.4°C30 Jul 2009	59 mm26 Jul 1998	151 mm2009 · driest 5 mm in 2026	29
August	40.0°C18 Aug 1998	5.6°C28 Aug 2004	89 mm19 Aug 2004	119 mm2004 · driest 7 mm in 2011	28
September	36.1°C1 Sep 2021	-1.7°C29 Sep 1999	29 mm13 Sep 2012	102 mm2013 · driest 0 mm in 2016	28
October	30.6°C2 Oct 2005	-13.9°C31 Oct 2019	43 mm10 Oct 2005	78 mm2006 · driest 0 mm in 2003	28
November	26.7°C4 Nov 1999	-21.1°C13 Nov 2014	22 mm6 Nov 2024	67 mm2024 · driest 1 mm in 2025	28
December	24.4°C23 Dec 2025	-28.3°C31 Dec 2014	27 mm29 Dec 2022	30 mm2022 · driest 0 mm in 2002	28

Typical days per month at MARSTON FLTR PLT, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	<1	3
February	0	0	25	<1	4
March	<1	0	20	1	3
April	2	0	10	2	2
May	9	2	2	2	<1
June	21	11	<1	1	0
July	28	21	0	1	0
August	27	17	0	<1	0
September	19	8	<1	1	0
October	6	<1	8	<1	<1
November	<1	0	20	<1	2
December	0	0	28	<1	3

How often, not how much — every day in MARSTON FLTR PLT’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	1%	11%	<1%	5%	4.3–9.5°C
February	4%	12%	2%	5%	5.2–12.4°C
March	15%	13%	4%	7%	10.1–16.0°C
April	32%	19%	6%	21%	13.7–18.6°C
May	52%	25%	8%	27%	17.1–23.1°C
June	77%	20%	5%	18%	24.5–30.0°C
July	80%	20%	5%	19%	29.3–32.6°C
August	80%	20%	3%	16%	28.1–31.3°C
September	79%	15%	4%	10%	23.8–28.1°C
October	48%	11%	2%	5%	15.1–20.8°C
November	19%	9%	1%	4%	9.7–15.4°C
December	2%	9%	1%	4%	6.0–10.7°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.

1999Each stripe is one year’s mean temperature against the 25-year average. Warmest: 2012. Coolest: 2013.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5417702
NOAA station: USC00055402 · MARSTON FLTR PLT
Station distance: 4.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 39.60°, 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 MARSTON FLTR PLT is what differs

Littleton→Dakota Ridge→Englewood→Ken Caryl→Columbine→Greenwood Village→

Or put two places side by side: Columbine Valley vs Littleton

Best time to visitColumbine Valley.

September

August

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Columbine Valley.

The whole year,
without the guesswork.

Nearby, measured,
and named.