United States · 1991–2020

Best time to visit
Littleton.

August leads for comfortable weather in Littleton: typically 25°C by day, 10.6°C at night, with 109 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high25°C

Typical low10.6°C

Rain in August109 mm

Comfort

August

August · June · July

71climate match

Beach

July

July · August · June

42climate match

Outdoors

September

September · May · June

73climate match

The weakest month is January, scoring 5 against August’s 71 — days reach only -3.2°C, 27° below the 24°C the score treats as ideal, and nights drop to -15.3°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

5-3.2° / -15.3°

Feb

5-1.6° / -14.9°

Mar

54° / -8.6°

Apr

1611.5° / -1.8°

May

4618.5° / 4.1°

Jun

6923.7° / 9.5°

Jul

6826° / 12.1°

Aug

7125° / 10.6°

Sep

6121.1° / 6.2°

Oct

2213.5° / 0.6°

Nov

56.5° / -4°

Dec

5-0.1° / -10.9°

Monthly climate evidence for Littleton — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-3.2°C	-15.3°C	68 mm	10.5	9 h 12	5	Good coverage
February	-1.6°C	-14.9°C	50 mm	8.3	10 h 23	5	Good coverage
March	4°C	-8.6°C	64 mm	10.5	11 h 47	5	Good coverage
April	11.5°C	-1.8°C	78 mm	10.3	13 h 23	16	Good coverage
May	18.5°C	4.1°C	94 mm	12	14 h 45	46	Good coverage
June	23.7°C	9.5°C	109 mm	13.6	15 h 30	69	Good coverage
July	26°C	12.1°C	121 mm	11.9	15 h 12	68	Good coverage
August	25°C	10.6°C	109 mm	10.8	14 h 01	71	Good coverage
September	21.1°C	6.2°C	91 mm	9.4	12 h 27	61	Good coverage
October	13.5°C	0.6°C	105 mm	11.3	10 h 54	22	Good coverage
November	6.5°C	-4°C	76 mm	10.5	9 h 33	5	Good coverage
December	-0.1°C	-10.9°C	84 mm	12.2	8 h 52	5	Good coverage

Records at BETHLEHEM 2, 1992–2013
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.9°C7 Jan 2007	-35.6°C27 Jan 1994	54 mm1 Jan 2011	139 mm1999 · driest 17 mm in 2004	21
February	17.8°C23 Feb 1997	-35.6°C7 Feb 1993	38 mm15 Feb 2007	109 mm2008 · driest 13 mm in 1999	21
March	26.7°C23 Mar 2012	-28.3°C1 Mar 2008	56 mm7 Mar 2011	100 mm1999 · driest 19 mm in 2013	21
April	30.6°C26 Apr 2009	-15.6°C6 Apr 1995	41 mm10 Apr 2000	183 mm2000 · driest 18 mm in 1999	21
May	31.7°C26 May 2007	-5.6°C13 May 2005	41 mm20 May 1999	164 mm1996 · driest 32 mm in 2008	21
June	35.6°C16 Jun 2001	-3.9°C12 Jun 2004	78 mm24 Jun 2013	222 mm2002 · driest 42 mm in 1995	21
July	33.9°C23 Jul 2011	1.7°C4 Jul 2005	60 mm22 Jul 2010	220 mm2008 · driest 50 mm in 2001	21
August	34.4°C10 Aug 2001	1.7°C30 Aug 1996	83 mm12 Aug 1998	204 mm2008 · driest 55 mm in 2002	22
September	32.8°C5 Sep 1999	-6.7°C3 Sep 2001	89 mm17 Sep 1999	192 mm1999 · driest 33 mm in 2012	21
October	27.2°C8 Oct 2005	-14.4°C8 Oct 2001	74 mm1 Oct 2010	231 mm2005 · driest 24 mm in 1994	21
November	21.7°C3 Nov 2001	-18.3°C27 Nov 1994	36 mm20 Nov 2003	126 mm2005 · driest 19 mm in 2012	21
December	20.0°C1 Dec 2006	-31.1°C27 Dec 1993	58 mm18 Dec 2000	165 mm2003 · driest 34 mm in 1998	21

Typical days per month at BETHLEHEM 2, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	2	12
February	0	0	27	1	9
March	<1	0	28	2	8
April	1	<1	21	2	3
May	4	<1	7	3	<1
June	13	3	<1	4	0
July	20	4	0	4	0
August	17	2	0	4	0
September	7	<1	4	3	0
October	<1	0	16	3	1
November	0	0	24	3	5
December	0	0	29	3	11

How often, not how much — every day in BETHLEHEM 2’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%	34%	6%	44%	-7.7–-0.3°C
February	0%	30%	5%	37%	-4.8–1.2°C
March	1%	34%	6%	46%	1.9–7.0°C
April	9%	35%	8%	46%	9.1–13.7°C
May	29%	39%	10%	56%	15.7–21.0°C
June	47%	45%	12%	62%	21.6–26.0°C
July	59%	38%	14%	52%	24.5–27.9°C
August	62%	35%	12%	43%	23.5–26.2°C
September	45%	32%	11%	42%	19.0–22.9°C
October	12%	36%	10%	50%	11.1–16.2°C
November	<1%	35%	9%	49%	3.6–9.9°C
December	0%	39%	8%	56%	-1.9–2.4°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.

1993Each stripe is one year’s mean temperature against the 20-year average. Warmest: 2006. Coolest: 1997.2012

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5088856
NOAA station: USC00270706 · BETHLEHEM 2
Station distance: 9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 20 usable years
Daylight: Calculated from latitude 44.31°, 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 BETHLEHEM 2 is what differs

Deerfield→Dalton→Franconia→Bethlehem→Sugar Hill→Alderbrook→

Or put two places side by side: Littleton vs Deerfield

Best time to visitLittleton.