United States · 1991–2020

Best time to visit
Orrtanna.

September leads for comfortable weather in Orrtanna: typically 25.5°C by day, 11.8°C at night, with 128 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.5°C

Typical low11.8°C

Rain in September128 mm

Comfort

September

September · May · August

73climate match

Beach

August

August · July · June

73climate match

Outdoors

October

October · May · April

78climate match

The weakest month is January, scoring 5 against September’s 73 — days reach only 4.7°C, 19° 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

54.7° / -5.7°

Feb

56.6° / -5°

Mar

1510.9° / -1.3°

Apr

4917.8° / 4.2°

May

7122.8° / 9°

Jun

7027.6° / 14.2°

Jul

6530° / 17°

Aug

7129.4° / 15.9°

Sep

7325.5° / 11.8°

Oct

5819.2° / 5.1°

Nov

2813.1° / 0.6°

Dec

57.2° / -3.8°

Monthly climate evidence for Orrtanna — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	4.7°C	-5.7°C	88 mm	7	9 h 38	5	Good coverage
February	6.6°C	-5°C	65 mm	5.9	10 h 38	5	Good coverage
March	10.9°C	-1.3°C	91 mm	8	11 h 49	15	Good coverage
April	17.8°C	4.2°C	84 mm	7.6	13 h 12	49	Good coverage
May	22.8°C	9°C	95 mm	9	14 h 21	71	Good coverage
June	27.6°C	14.2°C	112 mm	9.3	14 h 59	70	Good coverage
July	30°C	17°C	86 mm	7.6	14 h 44	65	Good coverage
August	29.4°C	15.9°C	83 mm	6.3	13 h 44	71	Good coverage
September	25.5°C	11.8°C	128 mm	6.9	12 h 24	73	Good coverage
October	19.2°C	5.1°C	74 mm	6.4	11 h 05	58	Good coverage
November	13.1°C	0.6°C	84 mm	6.3	9 h 55	28	Good coverage
December	7.2°C	-3.8°C	84 mm	6.8	9 h 21	5	Good coverage

Records at EISENHOWER NHS, 1982–2009
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.2°C30 Jan 2002	-31.7°C21 Jan 1994	57 mm20 Jan 1995	176 mm1998 · driest 33 mm in 2003	27
February	25.6°C27 Feb 1997	-25.6°C6 Feb 1996	57 mm17 Feb 2003	152 mm1984 · driest 5 mm in 2002	27
March	30.6°C31 Mar 1998	-21.1°C16 Mar 1993	58 mm22 Mar 2000	139 mm1994 · driest 10 mm in 2006	28
April	33.9°C18 Apr 2002	-8.9°C8 Apr 1982	53 mm16 Apr 1986	235 mm1983 · driest 17 mm in 1985	27
May	33.9°C31 May 2006	-2.8°C8 May 1997	63 mm29 May 1984	242 mm1989 · driest 20 mm in 2007	26
June	36.7°C22 Jun 1988	1.7°C3 Jun 1986	208 mm19 Jun 1996	306 mm1996 · driest 14 mm in 1988	27
July	40.0°C16 Jul 1988	6.1°C1 Jul 1988	70 mm8 Jul 2005	184 mm1996 · driest 11 mm in 1983	26
August	40.0°C20 Aug 1983	1.7°C29 Aug 1982	81 mm21 Aug 1999	186 mm1984 · driest 33 mm in 1992	26
September	36.7°C10 Sep 1983	-0.6°C28 Sep 1989	110 mm7 Sep 1996	248 mm2003 · driest 4 mm in 2005	27
October	33.3°C10 Oct 2007	-6.7°C27 Oct 1988	97 mm8 Oct 2005	180 mm2005 · driest 14 mm in 2000	27
November	28.3°C4 Nov 2003	-11.1°C24 Nov 1984	78 mm28 Nov 1993	212 mm1985 · driest 14 mm in 1998	27
December	26.1°C6 Dec 2001	-20.6°C24 Dec 1989	65 mm17 Dec 2000	168 mm1983 · driest 12 mm in 1998	27

Typical days per month at EISENHOWER NHS, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	24	3	2
February	<1	0	22	2	2
March	<1	<1	18	3	<1
April	4	<1	6	3	<1
May	10	3	<1	3	0
June	22	9	0	3	0
July	28	15	0	3	0
August	27	14	0	3	0
September	16	4	0	3	0
October	5	<1	5	2	0
November	<1	0	14	3	<1
December	<1	0	23	3	1

How often, not how much — every day in EISENHOWER NHS’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%	23%	9%	20%	0.9–8.6°C
February	1%	23%	9%	22%	3.8–9.2°C
March	9%	25%	10%	30%	8.2–13.1°C
April	30%	26%	10%	28%	16.2–19.6°C
May	56%	31%	12%	37%	21.0–26.3°C
June	71%	29%	10%	33%	26.3–29.3°C
July	74%	25%	9%	26%	28.3–32.1°C
August	78%	22%	10%	17%	27.5–31.1°C
September	72%	23%	10%	25%	23.5–27.5°C
October	37%	22%	8%	19%	17.3–21.2°C
November	11%	23%	10%	21%	10.1–15.9°C
December	1%	22%	10%	19%	3.4–10.3°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.

1983Each stripe is one year’s mean temperature against the 21-year average. Warmest: 1998. Coolest: 2000.2008

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4560160
NOAA station: USC00362537 · EISENHOWER NHS
Station distance: 12.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 17 usable years
Daylight: Calculated from latitude 39.85°, 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 EISENHOWER NHS is what differs

Gettysburg→Bonneauville→Lake Heritage→Fairfield→Barlow→Barlow Knoll→

Or put two places side by side: Orrtanna vs Gettysburg

Best time to visitOrrtanna.