St. Charles weather in December

In December, St. Charles sees average daytime highs of 35°F and overnight lows near 22°F, with 2.2 in of precipitation across 8 wet days and about 9 hours of daylight. It is the 10th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 39°F in the first days to 33°F by the end. The sky is clear or mostly clear about 23% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 12 min at the start of December to 9 hours by month's end. Set against the rest of the year, December is St. Charles's 11th-clearest and 7th-windiest month. For the whole year in context, see St. Charles's year-round climate.

Daytime high: 35°; 10th warmest
Overnight low: 22°; 3rd coldest
Precipitation: 2.2 in; 8 wet days
Daylight: 9 hours; 7:20 AM – 4:18 PM
Cloud cover: 69%; 11th clearest
Wind: 8 mph; 7th windiest
Solar energy: 1.62 kWh/m²
Travel score: 0.0; out of 10

St. Charles is Chicago suburb in Kane and DuPage counties of Illinois, United States.

Density: 847/km²; people per km²
Founded: 1834

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← November St. Charles year-round climate January →Best places to visit in December

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 39°F in the first days to 33°F by the end.

A typical December day in St. Charles reaches about 35°F in the afternoon and slips back to 22°F overnight — a 13°F spread between the day's warmth and the night's chill. On most days the high lands between 21°F and 49°F. Set against its neighbours, December runs about 12°F cooler than November and about 5°F warmer than January.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°F)	40	39	39	38	38	38	37	37	36	36	36	35	35	35	35	35	34	34	34	34	34	34	33	33	33	33	33	33	33	33	32
Avg low (°F)	26	26	26	25	25	24	24	24	23	23	23	22	22	22	22	22	21	21	21	21	21	21	21	20	20	20	20	20	20	19	19

	Avg high (°F)	Avg low (°F)
1	40	26
2	39	26
3	39	26
4	38	25
5	38	25
6	38	24
7	37	24
8	37	24
9	36	23
10	36	23
11	36	23
12	35	22
13	35	22
14	35	22
15	35	22
16	35	22
17	34	21
18	34	21
19	34	21
20	34	21
21	34	21
22	34	21
23	33	21
24	33	20
25	33	20
26	33	20
27	33	20
28	33	20
29	33	20
30	33	19
31	32	19

How December really feels in St. Charles

Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 31 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F

heat index over the day's high

Days feeling ≤ 32°F

22 feel bitter (≤ 14°F)

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

St. Charles weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 10th-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	30° / 16°	2.1	7.9	5.7	9.3	0.0
Feb	34° / 20°	1.9	7	4.9	10.3	0.0
Mar	46° / 29°	2.6	9.6	3.1	11.7	1.4
Apr	58° / 39°	4.5	12	1	13.1	4.1
May	69° / 50°	4.6	12.5	0	14.3	6.0
Jun	79° / 60°	4.2	12.3	0	15	6.3
Jul	82° / 65°	3.7	11.2	0	14.7	6.1
Aug	80° / 62°	3.7	10.6	0	13.7	6.5
Sep	74° / 55°	3.1	8.4	0	12.3	7.1
Oct	61° / 43°	3.1	9	0.2	10.9	5.2
Nov	47° / 32°	2.4	8	1.5	9.6	1.5
Dec	35° / 22°	2.2	8	4.4	9	0.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 11% of December, with mostly cloudy or overcast conditions the remaining 66%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	35	35	36	36	35	36	36	36	35	35	35	35	35	35	35	34	33	33	32	32	32	31	31	31	32	31	31	31	31	31	31
Cloudier (%)	65	65	64	64	65	64	64	64	65	65	65	65	65	65	65	66	67	67	68	68	68	69	69	69	68	69	69	69	69	69	69

	Clearer (%)	Cloudier (%)
1	35	65
2	35	65
3	36	64
4	36	64
5	35	65
6	36	64
7	36	64
8	36	64
9	35	65
10	35	65
11	35	65
12	35	65
13	35	65
14	35	65
15	35	65
16	34	66
17	33	67
18	33	67
19	32	68
20	32	68
21	32	68
22	31	69
23	31	69
24	31	69
25	32	68
26	31	69
27	31	69
28	31	69
29	31	69
30	31	69
31	31	69

Chance of precipitation in December

Any precipitationSnow

St. Charles gets around 2.2 in of rain and snow over 8 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 26% and peaks near 29% on the wettest days, and about 4 days bring snow.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	29	29	29	28	28	28	27	27	27	27	26	26	26	26	26	27	26	26	26	26	26	25	25	25	25	25	25	25	25	25	25
Snow chance (%)	12	13	13	13	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	15	15

	Rain chance (%)	Snow chance (%)
1	29	12
2	29	13
3	29	13
4	28	13
5	28	14
6	28	14
7	27	14
8	27	14
9	27	14
10	27	14
11	26	14
12	26	14
13	26	14
14	26	14
15	26	14
16	27	14
17	26	14
18	26	14
19	26	14
20	26	14
21	26	14
22	25	14
23	25	14
24	25	14
25	25	14
26	25	14
27	25	14
28	25	14
29	25	14
30	25	15
31	25	15

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	99	99	99	99	99	99	99	99	99	99	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Comfortable (%)	1	1	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

Wind in December

Winds average 8 mph in December.

Across December, daily wind ranges from about 8 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (mph)	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (mph)	Feels
1	8	light breeze
2	8	light breeze
3	8	light breeze
4	8	light breeze
5	8	light breeze
6	8	light breeze
7	8	light breeze
8	8	light breeze
9	8	light breeze
10	8	light breeze
11	8	light breeze
12	8	light breeze
13	8	light breeze
14	8	light breeze
15	8	light breeze
16	8	light breeze
17	8	light breeze
18	8	light breeze
19	8	light breeze
20	8	light breeze
21	8	light breeze
22	8	light breeze
23	8	light breeze
24	8	light breeze
25	8	light breeze
26	8	light breeze
27	8	light breeze
28	8	light breeze
29	8	light breeze
30	8	light breeze
31	8	light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 12 min at the start of December to 9 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:08 AM to 7:27 AM, and sunset from 4:18 PM to 4:26 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	9.2	9.2	9.1	9.1	9.1	9.1	9.1	9.0	9.0	9.0	9.0	9.0	9.0	9.0	9.0	9.0	9.0	9.0	9.0	8.9	8.9	8.9	8.9	8.9	9.0	9.0	9.0	9.0	9.0	9.0	9.0
Sunrise (AM)	7:08	7:09	7:10	7:11	7:12	7:13	7:13	7:14	7:15	7:16	7:17	7:18	7:18	7:19	7:20	7:20	7:21	7:22	7:22	7:23	7:23	7:24	7:24	7:25	7:25	7:25	7:26	7:26	7:26	7:27	7:27
Sunset (PM)	4:18	4:18	4:18	4:18	4:17	4:17	4:17	4:17	4:17	4:17	4:17	4:18	4:18	4:18	4:18	4:18	4:19	4:19	4:19	4:20	4:20	4:21	4:21	4:22	4:22	4:23	4:23	4:24	4:25	4:25	4:26

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	9.2	7:08	4:18
2	9.2	7:09	4:18
3	9.1	7:10	4:18
4	9.1	7:11	4:18
5	9.1	7:12	4:17
6	9.1	7:13	4:17
7	9.1	7:13	4:17
8	9.0	7:14	4:17
9	9.0	7:15	4:17
10	9.0	7:16	4:17
11	9.0	7:17	4:17
12	9.0	7:18	4:18
13	9.0	7:18	4:18
14	9.0	7:19	4:18
15	9.0	7:20	4:18
16	9.0	7:20	4:18
17	9.0	7:21	4:19
18	9.0	7:22	4:19
19	9.0	7:22	4:19
20	8.9	7:23	4:20
21	8.9	7:23	4:20
22	8.9	7:24	4:21
23	8.9	7:24	4:21
24	8.9	7:25	4:22
25	9.0	7:25	4:22
26	9.0	7:25	4:23
27	9.0	7:26	4:23
28	9.0	7:26	4:24
29	9.0	7:26	4:25
30	9.0	7:27	4:25
31	9.0	7:27	4:26

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.62 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.62 kWh/m² to a high of 6.3 kWh/m² in June across the year — December's 1.62 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	1.7	1.7	1.7	1.7	1.7	1.7	1.7	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6	1.6
Level	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim

	Solar energy (kWh/m²)	Level
1	1.7	Dim
2	1.7	Dim
3	1.7	Dim
4	1.7	Dim
5	1.7	Dim
6	1.7	Dim
7	1.7	Dim
8	1.6	Dim
9	1.6	Dim
10	1.6	Dim
11	1.6	Dim
12	1.6	Dim
13	1.6	Dim
14	1.6	Dim
15	1.6	Dim
16	1.6	Dim
17	1.6	Dim
18	1.6	Dim
19	1.6	Dim
20	1.6	Dim
21	1.6	Dim
22	1.6	Dim
23	1.6	Dim
24	1.6	Dim
25	1.6	Dim
26	1.6	Dim
27	1.6	Dim
28	1.6	Dim
29	1.6	Dim
30	1.6	Dim
31	1.6	Dim

Planning a trip in December

Is December a good time to visit St. Charles?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

0.0

Sightseeing

10th-best month of the year

0.0

Beach & pool

9th-best month of the year

December is a weaker month for outdoor sightseeing in St. Charles.

What to pack for St. Charles in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, St. Charles sees daytime highs around 35°F and nights near 22°F. Pack a warm layer and a heavy coat. Worth having: rain gear. About 8 days see rain.

a warm layera heavy coatrain gear

Sea temperature near St. Charles in December

The nearest coast averages about 42°F in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 35 mi away) is warmest in August at about 73°F and coldest in February near 36°F.

It's comfortable for a long swim from Jul 13 to Sep 15 — about 2.1 months when the water holds above 68°F.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°F)	38	36	36	39	45	57	70	73	68	58	49	42
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Refreshing	Refreshing	Refreshing	Bracing	Bracing	Bracing

	Sea temperature (°F)	Comfort
Jan	38	Bracing
Feb	36	Bracing
Mar	36	Bracing
Apr	39	Bracing
May	45	Bracing
Jun	57	Bracing
Jul	70	Refreshing
Aug	73	Refreshing
Sep	68	Refreshing
Oct	58	Bracing
Nov	49	Bracing
Dec	42	Bracing

UV index in St. Charles in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in St. Charles peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	2	3	4	6	8	9	8	8	6	3	2	2
Level	Low	Moderate	Moderate	High	Very high	Very high	Very high	Very high	High	Moderate	Moderate	Low

	UV index (midday)	Level
Jan	2	Low
Feb	3	Moderate
Mar	4	Moderate
Apr	6	High
May	8	Very high
Jun	9	Very high
Jul	8	Very high
Aug	8	Very high
Sep	6	High
Oct	3	Moderate
Nov	2	Moderate
Dec	2	Low

Air quality in St. Charles in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in St. Charles is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	12	15	16	14	15	16	17	16	13	9	10	11
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	12	Moderate
Feb	15	Moderate
Mar	16	Moderate
Apr	14	Moderate
May	15	Moderate
Jun	16	Moderate
Jul	17	Moderate
Aug	16	Moderate
Sep	13	Moderate
Oct	9	Good
Nov	10	Good
Dec	11	Good

Location & terrain

Where is St. Charles?

St. Charles sits at 41.9°N, 88.3°W, 732 ft above sea level, in United States. The nearest listed city is Geneva, 1.9 mi away.

Topography around St. Charles

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of St. Charles.

Within 2 miles, the terrain around St. Charles has only modest variations in elevation — a maximum elevation change of 187 ft around an average of 758 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 430 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 892 ft.

The land around St. Charles is covered by trees (49%) and artificial surfaces (30%) within 2 miles, trees (33%) and grassland (27%) within 10 miles, and cropland (43%) and trees (20%) within 50 miles.

2 miles

187 ft

trees 49%

10 miles

430 ft

trees 33%

50 miles

892 ft

cropland 43%

treesgrasslandcroplandartificial surfacesbare terrainwater

← November St. Charles year-round climate January →Best places to visit in December

December weather nearby: Geneva 1.9 mi · Batavia 4.3 mi · Wasco 5.0 mi · South Elgin 5.6 mi · West Chicago 5.6 mi · North Aurora 7.5 mi · Bartlett 8.7 mi · Elgin 8.7 mi

United States travel facts

Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 100% of US; price level, 2025
GDP per capita: $90,027; 2025
Happiness: 6.8 / 10; World Happiness, 2025
Safe drinking water: 98%; of population, 2024
Homicide rate: 5.8; per 100k, 2023
Road deaths: 12.7; per 100k/yr, 2019
Income group: High; World Bank
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for St. Charles (41.9142°, -88.3087°, elevation 732 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°F)	Avg low (°F)
1	40	26
2	39	26
3	39	26
4	38	25
5	38	25
6	38	24
7	37	24
8	37	24
9	36	23
10	36	23
11	36	23
12	35	22
13	35	22
14	35	22
15	35	22
16	35	22
17	34	21
18	34	21
19	34	21
20	34	21
21	34	21
22	34	21
23	33	21
24	33	20
25	33	20
26	33	20
27	33	20
28	33	20
29	33	20
30	33	19
31	32	19

	Clearer (%)	Cloudier (%)
1	35	65
2	35	65
3	36	64
4	36	64
5	35	65
6	36	64
7	36	64
8	36	64
9	35	65
10	35	65
11	35	65
12	35	65
13	35	65
14	35	65
15	35	65
16	34	66
17	33	67
18	33	67
19	32	68
20	32	68
21	32	68
22	31	69
23	31	69
24	31	69
25	32	68
26	31	69
27	31	69
28	31	69
29	31	69
30	31	69
31	31	69

	Rain chance (%)	Snow chance (%)
1	29	12
2	29	13
3	29	13
4	28	13
5	28	14
6	28	14
7	27	14
8	27	14
9	27	14
10	27	14
11	26	14
12	26	14
13	26	14
14	26	14
15	26	14
16	27	14
17	26	14
18	26	14
19	26	14
20	26	14
21	26	14
22	25	14
23	25	14
24	25	14
25	25	14
26	25	14
27	25	14
28	25	14
29	25	14
30	25	15
31	25	15

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Solar energy (kWh/m²)	Level
1	1.7	Dim
2	1.7	Dim
3	1.7	Dim
4	1.7	Dim
5	1.7	Dim
6	1.7	Dim
7	1.7	Dim
8	1.6	Dim
9	1.6	Dim
10	1.6	Dim
11	1.6	Dim
12	1.6	Dim
13	1.6	Dim
14	1.6	Dim
15	1.6	Dim
16	1.6	Dim
17	1.6	Dim
18	1.6	Dim
19	1.6	Dim
20	1.6	Dim
21	1.6	Dim
22	1.6	Dim
23	1.6	Dim
24	1.6	Dim
25	1.6	Dim
26	1.6	Dim
27	1.6	Dim
28	1.6	Dim
29	1.6	Dim
30	1.6	Dim
31	1.6	Dim

	Avg high (°F)	Avg low (°F)
1	40	26
2	39	26
3	39	26
4	38	25
5	38	25
6	38	24
7	37	24
8	37	24
9	36	23
10	36	23
11	36	23
12	35	22
13	35	22
14	35	22
15	35	22
16	35	22
17	34	21
18	34	21
19	34	21
20	34	21
21	34	21
22	34	21
23	33	21
24	33	20
25	33	20
26	33	20
27	33	20
28	33	20
29	33	20
30	33	19
31	32	19

	Clearer (%)	Cloudier (%)
1	35	65
2	35	65
3	36	64
4	36	64
5	35	65
6	36	64
7	36	64
8	36	64
9	35	65
10	35	65
11	35	65
12	35	65
13	35	65
14	35	65
15	35	65
16	34	66
17	33	67
18	33	67
19	32	68
20	32	68
21	32	68
22	31	69
23	31	69
24	31	69
25	32	68
26	31	69
27	31	69
28	31	69
29	31	69
30	31	69
31	31	69

	Rain chance (%)	Snow chance (%)
1	29	12
2	29	13
3	29	13
4	28	13
5	28	14
6	28	14
7	27	14
8	27	14
9	27	14
10	27	14
11	26	14
12	26	14
13	26	14
14	26	14
15	26	14
16	27	14
17	26	14
18	26	14
19	26	14
20	26	14
21	26	14
22	25	14
23	25	14
24	25	14
25	25	14
26	25	14
27	25	14
28	25	14
29	25	14
30	25	15
31	25	15

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Solar energy (kWh/m²)	Level
1	1.7	Dim
2	1.7	Dim
3	1.7	Dim
4	1.7	Dim
5	1.7	Dim
6	1.7	Dim
7	1.7	Dim
8	1.6	Dim
9	1.6	Dim
10	1.6	Dim
11	1.6	Dim
12	1.6	Dim
13	1.6	Dim
14	1.6	Dim
15	1.6	Dim
16	1.6	Dim
17	1.6	Dim
18	1.6	Dim
19	1.6	Dim
20	1.6	Dim
21	1.6	Dim
22	1.6	Dim
23	1.6	Dim
24	1.6	Dim
25	1.6	Dim
26	1.6	Dim
27	1.6	Dim
28	1.6	Dim
29	1.6	Dim
30	1.6	Dim
31	1.6	Dim

	Avg high (°F)	Avg low (°F)
1	40	26
2	39	26
3	39	26
4	38	25
5	38	25
6	38	24
7	37	24
8	37	24
9	36	23
10	36	23
11	36	23
12	35	22
13	35	22
14	35	22
15	35	22
16	35	22
17	34	21
18	34	21
19	34	21
20	34	21
21	34	21
22	34	21
23	33	21
24	33	20
25	33	20
26	33	20
27	33	20
28	33	20
29	33	20
30	33	19
31	32	19

	Clearer (%)	Cloudier (%)
1	35	65
2	35	65
3	36	64
4	36	64
5	35	65
6	36	64
7	36	64
8	36	64
9	35	65
10	35	65
11	35	65
12	35	65
13	35	65
14	35	65
15	35	65
16	34	66
17	33	67
18	33	67
19	32	68
20	32	68
21	32	68
22	31	69
23	31	69
24	31	69
25	32	68
26	31	69
27	31	69
28	31	69
29	31	69
30	31	69
31	31	69

	Rain chance (%)	Snow chance (%)
1	29	12
2	29	13
3	29	13
4	28	13
5	28	14
6	28	14
7	27	14
8	27	14
9	27	14
10	27	14
11	26	14
12	26	14
13	26	14
14	26	14
15	26	14
16	27	14
17	26	14
18	26	14
19	26	14
20	26	14
21	26	14
22	25	14
23	25	14
24	25	14
25	25	14
26	25	14
27	25	14
28	25	14
29	25	14
30	25	15
31	25	15

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Solar energy (kWh/m²)	Level
1	1.7	Dim
2	1.7	Dim
3	1.7	Dim
4	1.7	Dim
5	1.7	Dim
6	1.7	Dim
7	1.7	Dim
8	1.6	Dim
9	1.6	Dim
10	1.6	Dim
11	1.6	Dim
12	1.6	Dim
13	1.6	Dim
14	1.6	Dim
15	1.6	Dim
16	1.6	Dim
17	1.6	Dim
18	1.6	Dim
19	1.6	Dim
20	1.6	Dim
21	1.6	Dim
22	1.6	Dim
23	1.6	Dim
24	1.6	Dim
25	1.6	Dim
26	1.6	Dim
27	1.6	Dim
28	1.6	Dim
29	1.6	Dim
30	1.6	Dim
31	1.6	Dim