United States · 1991–2020

Best time to visit
Monticello.

September leads for comfortable weather in Monticello: typically 25.8°C by day, 11.6°C at night, with 71 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.8°C

Typical low11.6°C

Rain in September71 mm

Comfort

September

September · May · August

81climate match

Beach

August

August · July · June

73climate match

Outdoors

October

October · September · April

80climate match

The weakest month is January, scoring 5 against September’s 81 — days reach only 1.3°C, 23° 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

51.3° / -7°

Feb

54.2° / -5.1°

Mar

1910.6° / -0.5°

Apr

4918.1° / 5.1°

May

7423.4° / 10.5°

Jun

6928° / 15.7°

Jul

6129.3° / 17.1°

Aug

7228.7° / 16.3°

Sep

8125.8° / 11.6°

Oct

5919° / 6°

Nov

2411.3° / 1.3°

Dec

53.5° / -4.6°

Monthly climate evidence for Monticello — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	1.3°C	-7°C	61 mm	7.2	9 h 33	5	Good coverage
February	4.2°C	-5.1°C	48 mm	5.5	10 h 35	5	Good coverage
March	10.6°C	-0.5°C	74 mm	6.8	11 h 49	19	Good coverage
April	18.1°C	5.1°C	94 mm	8.7	13 h 14	49	Good coverage
May	23.4°C	10.5°C	108 mm	9.6	14 h 26	74	Good coverage
June	28°C	15.7°C	117 mm	8.2	15 h 05	69	Good coverage
July	29.3°C	17.1°C	131 mm	8.2	14 h 49	61	Good coverage
August	28.7°C	16.3°C	86 mm	6.6	13 h 47	72	Good coverage
September	25.8°C	11.6°C	71 mm	5.4	12 h 25	81	Good coverage
October	19°C	6°C	72 mm	6.4	11 h 03	59	Good coverage
November	11.3°C	1.3°C	75 mm	7.3	9 h 51	24	Good coverage
December	3.5°C	-4.6°C	61 mm	6.8	9 h 16	5	Good coverage

Records at DELPHI 2 N, 1893–2011
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.7°C26 Jan 1950	-31.7°C28 Jan 1963	71 mm21 Jan 1959	201 mm1950 · driest 2 mm in 1986	116
February	22.8°C11 Feb 1999	-31.1°C26 Feb 1963	62 mm22 Feb 1990	161 mm1990 · driest 3 mm in 1947	117
March	31.1°C24 Mar 1910	-21.7°C8 Mar 1943	80 mm24 Mar 1913	202 mm1913 · driest 9 mm in 1910	117
April	33.9°C29 Apr 1899	-12.2°C7 Apr 1982	102 mm27 Apr 1959	229 mm1994 · driest 20 mm in 1899	119
May	37.8°C31 May 1937	-3.9°C10 May 1966	177 mm16 May 1968	282 mm1943 · driest 5 mm in 1925	119
June	42.2°C28 Jun 1934	1.1°C1 Jun 1931	115 mm13 Jun 1942	334 mm1902 · driest 5 mm in 1988	118
July	44.4°C24 Jul 1934	4.4°C27 Jul 1920	95 mm20 Jul 1963	345 mm2003 · driest 0 mm in 1936	117
August	41.7°C5 Aug 1918	2.2°C29 Aug 1965	96 mm10 Aug 1977	289 mm1977 · driest 14 mm in 1996	117
September	40.0°C14 Sep 1939	-3.9°C30 Sep 1899	121 mm1 Sep 1989	267 mm1926 · driest 1 mm in 1979	118
October	33.9°C2 Oct 1922	-9.4°C30 Oct 1925	100 mm12 Oct 1901	203 mm1949 · driest 4 mm in 2005	116
November	28.3°C1 Nov 1950	-22.2°C28 Nov 1930	90 mm2 Nov 1936	192 mm1985 · driest 3 mm in 1904	115
December	21.7°C6 Dec 1998	-29.4°C22 Dec 1989	71 mm18 Dec 1924	191 mm1924 · driest 2 mm in 1962	115

Typical days per month at DELPHI 2 N, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	26	2	4
February	0	0	22	2	2
March	<1	0	17	2	1
April	4	<1	6	4	<1
May	12	4	<1	4	0
June	24	10	0	4	0
July	28	13	0	4	0
August	27	11	0	3	0
September	18	6	<1	2	0
October	6	<1	4	3	0
November	<1	0	13	2	<1
December	0	0	23	2	3

How often, not how much — every day in DELPHI 2 N’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%	24%	6%	25%	-2.2–5.6°C
February	<1%	22%	6%	19%	-0.3–7.3°C
March	8%	27%	9%	31%	6.5–13.9°C
April	27%	31%	11%	38%	15.0–20.2°C
May	54%	30%	12%	37%	20.7–26.5°C
June	72%	27%	11%	30%	26.2–30.9°C
July	76%	24%	11%	24%	28.3–33.0°C
August	78%	22%	9%	19%	27.4–31.6°C
September	72%	21%	9%	20%	23.8–28.7°C
October	40%	21%	8%	22%	16.8–22.4°C
November	8%	25%	8%	24%	8.1–13.8°C
December	<1%	24%	7%	24%	0.3–7.2°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.

1894Each stripe is one year’s mean temperature against the 108-year average. Warmest: 1921. Coolest: 1904.2010

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4923745
NOAA station: USC00122149 · DELPHI 2 N
Station distance: 16.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 19 usable years
Daylight: Calculated from latitude 40.75°, 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 DELPHI 2 N is what differs

Delphi→Flora→Camden→Idaville→Americus→Norway→

Or put two places side by side: Monticello vs Delphi

Best time to visitMonticello.