United States · 1991–2020

Best time to visit
Bartlett.

September leads for comfortable weather in Bartlett: typically 27.6°C by day, 14.3°C at night, with 112 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27.6°C

Typical low14.3°C

Rain in September112 mm

Comfort

September

September · May · October

73climate match

Beach

July

July · August · June

70climate match

Outdoors

October

October · April · November

75climate match

The weakest month is January, scoring 5 against September’s 73 — days reach only 6.3°C, 18° below the 24°C the score treats as ideal, and nights drop to -6.1°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

56.3° / -6.1°

Feb

149.3° / -4.1°

Mar

3314.6° / 1°

Apr

5419.8° / 6.3°

May

6824.4° / 12.5°

Jun

5629.4° / 18°

Jul

4932.2° / 20.3°

Aug

5232.1° / 19.1°

Sep

7327.6° / 14.3°

Oct

6421.4° / 7.2°

Nov

3514.1° / 0.8°

Dec

88° / -4.2°

Monthly climate evidence for Bartlett — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	6.3°C	-6.1°C	40 mm	4.9	9 h 52	5	Strong coverage
February	9.3°C	-4.1°C	47 mm	4.8	10 h 46	14	Strong coverage
March	14.6°C	1°C	83 mm	7.4	11 h 51	33	Strong coverage
April	19.8°C	6.3°C	120 mm	8.3	13 h 05	54	Strong coverage
May	24.4°C	12.5°C	180 mm	10	14 h 08	68	Strong coverage
June	29.4°C	18°C	145 mm	8.7	14 h 41	56	Strong coverage
July	32.2°C	20.3°C	114 mm	7.1	14 h 28	49	Strong coverage
August	32.1°C	19.1°C	111 mm	6.3	13 h 35	52	Strong coverage
September	27.6°C	14.3°C	112 mm	6.6	12 h 22	73	Strong coverage
October	21.4°C	7.2°C	102 mm	6.8	11 h 10	64	Strong coverage
November	14.1°C	0.8°C	68 mm	5.6	10 h 08	35	Strong coverage
December	8°C	-4.2°C	57 mm	5.1	9 h 38	8	Strong coverage

What has changed

Bartlett runs -0.5°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

+0.3

Feb

-1.1

Mar

-0.1

Apr

-1.7

May

-1.7

Jun

-0.2

Jul

-1.3

Aug

-1.5

Sep

+0.3

Oct

-0.6

Nov

-0.3

Dec

+1.3

September daytime highs, 2011–2025. Last recorded: 27.5°C.

Records at MOUND VALLEY 3 WSW, 1951–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.3°C2 Jan 2006	-28.9°C21 Jan 1984	60 mm5 Jan 2005	133 mm1973 · driest 0 mm in 1986	75
February	30.0°C12 Feb 1962	-32.2°C10 Feb 2011	67 mm23 Feb 1985	133 mm1985 · driest 0 mm in 2006	75
March	33.9°C22 Mar 2026	-21.1°C4 Mar 2002	125 mm10 Mar 1974	283 mm1973 · driest 9 mm in 1956	75
April	37.8°C12 Apr 1972	-10.0°C13 Apr 1957	148 mm11 Apr 1994	311 mm1994 · driest 9 mm in 1989	75
May	35.0°C22 May 1956	-2.2°C3 May 1976	124 mm8 May 2002	424 mm2019 · driest 27 mm in 1963	74
June	40.0°C28 Jun 1980	4.4°C1 Jun 1982	165 mm22 Jun 1977	374 mm2007 · driest 15 mm in 1952	75
July	46.7°C14 Jul 1954	8.3°C6 Jul 1972	229 mm3 Jul 1976	418 mm1976 · driest 4 mm in 1954	75
August	44.4°C18 Aug 1956	7.2°C29 Aug 1988	146 mm15 Aug 2018	372 mm2019 · driest 0 mm in 2000	74
September	42.2°C3 Sep 2000	-2.8°C30 Sep 1984	132 mm18 Sep 2017	367 mm1986 · driest 4 mm in 1952	74
October	36.7°C7 Oct 1963	-9.4°C31 Oct 1993	192 mm10 Oct 2014	327 mm1998 · driest 0 mm in 1952	74
November	30.0°C8 Nov 1980	-16.7°C29 Nov 1976	120 mm20 Nov 1979	227 mm2024 · driest 0 mm in 1976	75
December	25.6°C28 Dec 2025	-26.7°C24 Dec 1966	68 mm4 Dec 1973	143 mm1973 · driest 1 mm in 2025	75

Typical days per month at MOUND VALLEY 3 WSW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	1	2
February	<1	0	23	1	1
March	2	<1	15	3	<1
April	7	<1	4	4	0
May	16	4	<1	5	0
June	27	16	0	4	0
July	30	24	0	4	0
August	30	22	0	3	0
September	22	11	0	3	0
October	10	1	3	3	0
November	<1	0	15	2	<1
December	0	0	25	2	1

The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 75); on 2011–2025 it is September (79). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in MOUND VALLEY 3 WSW’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	2%	14%	4%	9%	4.0–10.4°C
February	9%	16%	5%	11%	5.6–13.5°C
March	26%	22%	9%	23%	11.6–18.9°C
April	48%	26%	12%	27%	18.0–24.0°C
May	62%	31%	15%	38%	22.9–27.4°C
June	73%	27%	13%	29%	27.8–32.2°C
July	80%	20%	10%	17%	30.8–36.0°C
August	80%	20%	9%	19%	30.0–35.4°C
September	77%	21%	10%	20%	25.6–31.1°C
October	58%	20%	10%	20%	19.8–25.0°C
November	21%	17%	7%	13%	10.7–17.5°C
December	3%	15%	6%	12%	5.5–11.1°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.

1952Each stripe is one year’s mean temperature against the 69-year average. Warmest: 1954. Coolest: 1989.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4267932
NOAA station: USC00145536 · MOUND VALLEY 3 WSW
Station distance: 25.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 37.05°, 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 MOUND VALLEY 3 WSW is what differs

Altamont→Edna→Mound Valley→Angola→Penfield→Stover→

Or put two places side by side: Bartlett vs Altamont

Best time to visitBartlett.