United States · 1991–2020

Best time to visit
Morrisville.

September leads for comfortable weather in Morrisville: typically 25.5°C by day, 14.5°C at night, with 105 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.5°C

Typical low14.5°C

Rain in September105 mm

Comfort

September

September · May · June

81climate match

Beach

August

August · July · June

75climate match

Outdoors

October

October · May · April

76climate match

The weakest month is January, scoring 5 against September’s 81 — days reach only 4.3°C, 20° 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

54.3° / -4.4°

Feb

56.1° / -3.3°

Mar

1710.8° / 0.6°

Apr

4817.3° / 5.8°

May

7422.6° / 11.2°

Jun

6927.3° / 16.4°

Jul

5630.3° / 19.4°

Aug

6229.1° / 18.6°

Sep

8125.5° / 14.5°

Oct

5718.7° / 8.1°

Nov

3112.9° / 2.6°

Dec

57.1° / -1.4°

Monthly climate evidence for Morrisville — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	4.3°C	-4.4°C	83 mm	8.5	9 h 36	5	Good coverage
February	6.1°C	-3.3°C	72 mm	7.7	10 h 36	5	Good coverage
March	10.8°C	0.6°C	98 mm	8.7	11 h 49	17	Good coverage
April	17.3°C	5.8°C	96 mm	8.8	13 h 13	48	Good coverage
May	22.6°C	11.2°C	102 mm	9.1	14 h 23	74	Good coverage
June	27.3°C	16.4°C	114 mm	9.5	15 h 01	69	Good coverage
July	30.3°C	19.4°C	111 mm	8.7	14 h 46	56	Good coverage
August	29.1°C	18.6°C	108 mm	8.2	13 h 46	62	Good coverage
September	25.5°C	14.5°C	105 mm	7.2	12 h 24	81	Good coverage
October	18.7°C	8.1°C	100 mm	7.7	11 h 04	57	Good coverage
November	12.9°C	2.6°C	81 mm	7.2	9 h 54	31	Good coverage
December	7.1°C	-1.4°C	101 mm	9	9 h 19	5	Good coverage

Records at TRENTON-MERCER AP, 1945–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.2°C6 Jan 2007	-18.8°C7 Jan 2018	55 mm9 Jan 2024	167 mm1999 · driest 21 mm in 2025	28
February	25.6°C21 Feb 2018	-17.7°C24 Feb 2015	47 mm13 Feb 2008	146 mm2018 · driest 16 mm in 2009	28
March	30.6°C30 Mar 1998	-14.3°C6 Mar 2015	74 mm23 Mar 2024	212 mm2010 · driest 29 mm in 2012	30
April	33.9°C17 Apr 2002	-5.6°C1 Apr 2003	116 mm15 Apr 2007	253 mm2007 · driest 38 mm in 2001	30
May	35.6°C19 May 2026	-0.5°C10 May 2020	71 mm27 May 2018	192 mm2019 · driest 16 mm in 2023	30
June	36.7°C30 Jun 1945	6.1°C1 Jun 1945	89 mm7 Jun 2013	258 mm2013 · driest 25 mm in 2010	30
July	41.1°C22 Jul 2011	10.0°C12 Jul 1945	73 mm12 Jul 2004	251 mm1945 · driest 14 mm in 1999	30
August	37.8°C2 Aug 2002	9.4°C28 Aug 2025	118 mm14 Aug 2011	399 mm2011 · driest 20 mm in 2010	29
September	36.1°C1 Sep 2010	2.2°C30 Sep 2000	184 mm16 Sep 1999	285 mm1999 · driest 11 mm in 2024	29
October	33.9°C2 Oct 2019	-2.7°C19 Oct 2015	122 mm8 Oct 2005	285 mm2005 · driest 0 mm in 2024	28
November	26.7°C1 Nov 2024	-10.5°C23 Nov 2018	68 mm8 Nov 2006	225 mm2018 · driest 16 mm in 2021	28
December	24.4°C7 Dec 1998	-14.9°C23 Dec 2024	55 mm18 Dec 2023	191 mm2023 · driest 24 mm in 1998	28

Typical days per month at TRENTON-MERCER AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	3	5
February	0	0	22	2	4
March	<1	0	15	3	2
April	3	<1	3	3	<1
May	11	3	<1	4	0
June	22	9	0	4	0
July	29	18	0	4	0
August	28	14	0	3	0
September	17	4	0	3	0
October	4	<1	1	3	0
November	<1	0	10	3	<1
December	0	0	22	4	2

How often, not how much — every day in TRENTON-MERCER 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	<1%	27%	9%	28%	1.4–7.6°C
February	1%	28%	8%	34%	2.4–9.7°C
March	9%	28%	11%	33%	7.8–14.4°C
April	25%	30%	9%	32%	14.9–19.0°C
May	53%	31%	12%	37%	20.6–24.6°C
June	67%	31%	13%	36%	26.0–28.7°C
July	70%	30%	12%	33%	28.3–32.0°C
August	74%	26%	10%	27%	27.6–30.7°C
September	72%	24%	10%	25%	23.7–27.4°C
October	35%	24%	10%	23%	17.2–21.0°C
November	8%	24%	9%	26%	10.3–15.3°C
December	1%	30%	12%	36%	4.2–10.2°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 27-year average. Warmest: 2012. Coolest: 2003.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5201996
NOAA station: USW00014792 · TRENTON-MERCER AP
Station distance: 7.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 40.21°, 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 TRENTON-MERCER AP is what differs

Trenton→Ewing→White Horse→Prospect Park→Lawrenceville→Bordentown→

Or put two places side by side: Morrisville vs Trenton

Best time to visitMorrisville.