United States · 1991–2020

Best time to visit
Amsterdam.

September leads for comfortable weather in Amsterdam: typically 23°C by day, 4°C at night, with 25 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23°C

Typical low4°C

Rain in September25 mm

Comfort

September

September · June · July

75climate match

Beach

July

July · August · June

63climate match

Outdoors

September

September · May · June

78climate match

The weakest month is January, scoring 5 against September’s 75 — days reach only 0.2°C, 24° below the 24°C the score treats as ideal, and nights drop to -12.3°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

50.2° / -12.3°

Feb

52.4° / -10.7°

Mar

88.3° / -6°

Apr

2813.2° / -1.8°

May

5118.5° / 2.9°

Jun

7323.5° / 6.6°

Jul

6929.8° / 9.5°

Aug

6929.2° / 8.3°

Sep

7523° / 4°

Oct

3514.1° / -1.8°

Nov

55.7° / -7.7°

Dec

5-0.1° / -12.8°

Monthly climate evidence for Amsterdam — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	0.2°C	-12.3°C	11 mm	3.3	9 h 02	5	Strong coverage
February	2.4°C	-10.7°C	10 mm	3.6	10 h 17	5	Strong coverage
March	8.3°C	-6°C	22 mm	5.1	11 h 46	8	Strong coverage
April	13.2°C	-1.8°C	43 mm	8.8	13 h 27	28	Strong coverage
May	18.5°C	2.9°C	55 mm	10.3	14 h 54	51	Strong coverage
June	23.5°C	6.6°C	64 mm	9.3	15 h 42	73	Strong coverage
July	29.8°C	9.5°C	28 mm	5.6	15 h 23	69	Strong coverage
August	29.2°C	8.3°C	23 mm	4.6	14 h 08	69	Strong coverage
September	23°C	4°C	25 mm	5.1	12 h 29	75	Strong coverage
October	14.1°C	-1.8°C	29 mm	5.6	10 h 51	35	Strong coverage
November	5.7°C	-7.7°C	19 mm	4.4	9 h 24	5	Strong coverage
December	-0.1°C	-12.8°C	11 mm	3.6	8 h 41	5	Strong coverage

What has changed

Amsterdam runs +1.1°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

+1.8

Feb

-1.2

Mar

+2.6

Apr

+0.5

May

+0.3

Jun

+1.5

Jul

+1.5

Aug

+1.1

Sep

+2.8

Oct

-0.3

Nov

+1.1

Dec

+2.0

September daytime highs, 2011–2025. Last recorded: 25.7°C.

Records at BOZEMAN GALLATIN FLD AP, 1941–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	15.6°C24 Jan 1953	-43.3°C26 Jan 1957	18 mm14 Jan 2003	43 mm1989 · driest 2 mm in 1983	84
February	18.9°C24 Feb 1995	-41.7°C4 Feb 1989	16 mm16 Feb 1991	39 mm1975 · driest 2 mm in 2013	84
March	26.1°C20 Mar 2026	-39.3°C4 Mar 2019	23 mm5 Mar 2026	60 mm1982 · driest 4 mm in 1996	84
April	30.0°C19 Apr 1962	-20.6°C3 Apr 1970	26 mm30 Apr 1951	81 mm2018 · driest 6 mm in 1980	84
May	33.3°C13 May 2026	-10.0°C9 May 2002	49 mm25 May 1980	158 mm1981 · driest 11 mm in 2001	85
June	37.8°C30 Jun 1990	-3.3°C3 Jun 1951	54 mm25 Jun 1969	185 mm1969 · driest 6 mm in 2021	85
July	41.1°C12 Jul 2026	-1.1°C7 Jul 1971	38 mm13 Jul 1962	118 mm1993 · driest 0 mm in 1996	85
August	39.4°C5 Aug 1961	-2.8°C25 Aug 1992	45 mm1 Aug 1948	83 mm1964 · driest 0 mm in 2001	84
September	37.8°C5 Sep 2020	-9.4°C29 Sep 1985	31 mm2 Sep 1944	114 mm1947 · driest 0 mm in 1964	84
October	31.7°C1 Oct 2011	-28.8°C26 Oct 2020	33 mm4 Oct 1992	81 mm1975 · driest 0 mm in 1987	84
November	24.4°C5 Nov 2009	-37.8°C16 Nov 1959	23 mm8 Nov 2010	58 mm1962 · driest 0 mm in 1954	84
December	18.9°C1 Dec 2021	-43.3°C24 Dec 1983	26 mm23 Dec 1955	50 mm1955 · driest 2 mm in 2020	84

Typical days per month at BOZEMAN GALLATIN FLD AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	<1	4
February	0	0	27	0	2
March	0	0	28	<1	3
April	1	0	21	<1	4
May	5	<1	7	1	<1
June	13	4	<1	2	0
July	27	17	0	<1	0
August	26	16	<1	<1	<1
September	13	5	5	<1	0
October	2	<1	21	<1	1
November	0	0	28	<1	4
December	0	0	30	0	5

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 80); on 2011–2025 it is September (82). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in BOZEMAN GALLATIN FLD AP’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%	13%	<1%	8%	-5.5–3.0°C
February	0%	14%	<1%	10%	-2.4–6.3°C
March	2%	19%	<1%	15%	1.9–11.3°C
April	14%	25%	2%	27%	10.1–15.5°C
May	34%	31%	5%	41%	15.4–21.1°C
June	58%	30%	6%	35%	20.5–26.0°C
July	82%	17%	2%	15%	26.6–32.0°C
August	81%	17%	2%	11%	25.8–31.0°C
September	60%	18%	3%	19%	19.1–25.4°C
October	25%	17%	2%	12%	11.8–17.7°C
November	<1%	16%	<1%	11%	1.9–9.0°C
December	0%	13%	<1%	7%	-3.7–3.7°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.

1942Each stripe is one year’s mean temperature against the 83-year average. Warmest: 2007. Coolest: 1975.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5637141
NOAA station: USW00024132 · BOZEMAN GALLATIN FLD AP
Station distance: 12.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 45.76°, 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 BOZEMAN GALLATIN FLD AP is what differs

Belgrade→Churchill→Westlake→Accola→Belgrade Junction→Belgrade Trailer Court→

Or put two places side by side: Amsterdam vs Belgrade

Best time to visitAmsterdam.

September

July

September

The whole year,without the guesswork.

Amsterdam runs +1.1°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Amsterdam.

The whole year,
without the guesswork.

Amsterdam runs +1.1°C
on the 1961–1990 baseline.

Nearby, measured,
and named.