United States · 1991–2020

Best time to visit
Northumberland.

September leads for comfortable weather in Northumberland: typically 24.6°C by day, 11.2°C at night, with 124 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.6°C

Typical low11.2°C

Rain in September124 mm

Comfort

September

September · June · August

74climate match

Beach

July

July · August · June

64climate match

Outdoors

May

May · October · September

70climate match

The weakest month is January, scoring 5 against September’s 74 — days reach only 2.2°C, 22° below the 24°C the score treats as ideal.

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

52.2° / -7.1°

Feb

53.5° / -6.6°

Mar

89° / -2.5°

Apr

3916.4° / 3.1°

May

6722.3° / 9°

Jun

7126.9° / 13.8°

Jul

6329.7° / 16°

Aug

7128° / 15.2°

Sep

7424.6° / 11.2°

Oct

4717.7° / 5.5°

Nov

1910.7° / -0.2°

Dec

54.7° / -3.6°

Monthly climate evidence for Northumberland — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	2.2°C	-7.1°C	69 mm	8.2	9 h 32	5	Good coverage
February	3.5°C	-6.6°C	59 mm	7.3	10 h 34	5	Good coverage
March	9°C	-2.5°C	79 mm	7.9	11 h 49	8	Good coverage
April	16.4°C	3.1°C	91 mm	10.3	13 h 14	39	Good coverage
May	22.3°C	9°C	102 mm	11.2	14 h 26	67	Good coverage
June	26.9°C	13.8°C	112 mm	10.2	15 h 06	71	Good coverage
July	29.7°C	16°C	115 mm	9	14 h 50	63	Good coverage
August	28°C	15.2°C	105 mm	9.2	13 h 48	71	Good coverage
September	24.6°C	11.2°C	124 mm	8	12 h 25	74	Good coverage
October	17.7°C	5.5°C	107 mm	9	11 h 02	47	Good coverage
November	10.7°C	-0.2°C	77 mm	7.3	9 h 50	19	Good coverage
December	4.7°C	-3.6°C	90 mm	8.1	9 h 15	5	Good coverage

Records at SUNBURY, 1957–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.7°C26 Jan 1967	-26.1°C22 Jan 1961	41 mm25 Jan 2010	133 mm1964 · driest 13 mm in 2025	40
February	25.0°C25 Feb 2017	-23.3°C9 Feb 1967	55 mm4 Feb 2022	150 mm1971 · driest 8 mm in 1968	39
March	27.2°C28 Mar 2007	-17.2°C1 Mar 2014	78 mm5 Mar 2008	175 mm2011 · driest 22 mm in 2006	39
April	33.3°C25 Apr 1960	-8.9°C2 Apr 1964	48 mm17 Apr 2011	221 mm2011 · driest 20 mm in 1971	38
May	36.1°C22 May 1975	-2.2°C24 May 1963	70 mm9 May 1960	207 mm2025 · driest 36 mm in 1964	38
June	37.8°C30 Jun 1959	2.8°C1 Jun 2009	189 mm22 Jun 1972	328 mm1972 · driest 10 mm in 1966	39
July	38.9°C4 Jul 1966	5.0°C26 Jul 2008	102 mm24 Jul 2018	332 mm2018 · driest 32 mm in 1968	39
August	37.2°C21 Aug 1962	5.0°C30 Aug 1965	79 mm28 Aug 1962	201 mm2011 · driest 34 mm in 1957	39
September	35.6°C5 Sep 1964	-2.8°C24 Sep 1963	140 mm8 Sep 2011	506 mm2011 · driest 23 mm in 2005	40
October	32.8°C10 Oct 2007	-7.2°C24 Oct 1969	99 mm1 Oct 2010	173 mm2005 · driest 2 mm in 1963	40
November	27.2°C1 Nov 2024	-13.3°C23 Nov 1964	108 mm27 Nov 2007	237 mm2007 · driest 28 mm in 2012	40
December	21.7°C2 Dec 2006	-24.4°C24 Dec 1960	60 mm18 Dec 2023	179 mm2008 · driest 21 mm in 1958	40

Typical days per month at SUNBURY, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	2	5
February	<1	0	26	2	5
March	<1	0	22	2	2
April	3	<1	9	3	<1
May	11	3	1	4	0
June	22	7	0	4	0
July	29	16	0	4	0
August	27	9	0	3	0
September	15	4	<1	3	0
October	3	<1	5	4	<1
November	0	0	18	3	<1
December	0	0	25	3	3

How often, not how much — every day in SUNBURY’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%	28%	8%	30%	-0.4–4.3°C
February	<1%	28%	8%	32%	1.1–6.6°C
March	5%	29%	9%	34%	6.2–12.3°C
April	22%	33%	11%	43%	13.4–19.3°C
May	48%	34%	11%	45%	19.8–24.7°C
June	66%	31%	12%	37%	24.9–28.3°C
July	70%	29%	11%	33%	28.0–31.1°C
August	72%	27%	10%	30%	26.8–29.9°C
September	65%	26%	10%	29%	22.2–26.6°C
October	30%	25%	9%	26%	15.9–19.6°C
November	4%	26%	8%	29%	8.5–13.5°C
December	0%	28%	9%	33%	1.5–7.1°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.

1958Each stripe is one year’s mean temperature against the 36-year average. Warmest: 2012. Coolest: 1963.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5203859
NOAA station: USC00368668 · SUNBURY
Station distance: 3.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 usable years
Daylight: Calculated from latitude 40.89°, 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 SUNBURY is what differs

Sunbury→Danville→Riverside→Trevorton→Shamokin Dam→Kapp Heights→

Or put two places side by side: Northumberland vs Sunbury

Best time to visitNorthumberland.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Northumberland.

The whole year,
without the guesswork.

Nearby, measured,
and named.