Plainfield weather in January

In January, Plainfield sees average daytime highs of 36°F and overnight lows near 22°F, with 3.2 in of precipitation across 9 wet days and about 9.5 hours of daylight. It is the 12th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 36°F through the month. The sky is clear or mostly clear about 20% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 12 min at the start of January to 9 h 54 min by month's end. Set against the rest of the year, January is Plainfield's 12th-clearest and 2nd-windiest month. For the whole year in context, see Plainfield's year-round climate.

Daytime high
36°
12th warmest
Overnight low
22°
1st coldest
Precipitation
3.2 in
9 wet days
Daylight
9 h 30 min
8:10 AM – 5:39 PM
Cloud cover
72%
12th clearest
Wind
9 mph
2nd windiest
Solar energy
2.01 kWh/m²
Travel score
0.0
out of 10

Plainfield is town in Hendricks County, Indiana, United States.

Density
521/km²
people per km²
Founded
1839

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

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 36°F through the month.

A typical January day in Plainfield reaches about 36°F in the afternoon and slips back to 22°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 20°F and 52°F. Set against its neighbours, January runs about 4°F cooler than December and about 4°F cooler than February.

20°40°60°151015202531
Avg high (°F)Avg low (°F)
13724
23724
33724
43723
53723
63723
73623
83623
93622
103622
113622
123622
133622
143522
153521
163521
173521
183521
193521
203521
213521
223521
233521
243521
253521
263621
273621
283621
293621
303621
313722

How January really feels in Plainfield

Once humidity and wind are folded in, January 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
0
heat index over the day's high
Days feeling ≤ 32°F
31
29 feel bitter (≤ 14°F)

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

Plainfield weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan36° / 22°3.294.39.50.0
Feb40° / 25°2.68.44.110.40.1
Mar51° / 33°3.810.82.111.72.3
Apr63° / 44°4.911.80.3135.1
May72° / 55°4.913.4014.26.1
Jun81° / 64°4.411.7014.86.1
Jul84° / 67°3.711.3014.55.5
Aug82° / 65°3.09.3013.66.3
Sep77° / 57°2.87.4012.37.3
Oct64° / 46°3.38.60.110.95.9
Nov51° / 35°3.58.80.99.82.5
Dec40° / 27°3.09.73.59.20.1

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 9% of January, with mostly cloudy or overcast conditions the remaining 70%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32971
42872
52872
62872
72872
82872
92872
102872
112872
122773
132773
142872
152971
162971
172971
183070
192971
203070
213070
223169
233268
243268
253268
263367
273268
283367
293367
303466
313565

Chance of precipitation in January

Any precipitationSnow

Plainfield gets around 3.2 in of rain and snow over 9 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 29% and peaks near 30% on the wettest days, and about 4 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
12812
22812
32812
42912
52912
62912
73012
83013
93013
103013
113013
123013
133013
143013
153013
163014
173014
183014
193014
203015
212915
222915
232915
242915
252916
262916
272916
282916
292916
302916
312816

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

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

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
10991
11991
12991
13991
14991
15991
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in January

Winds average 9 mph in January.

Across January, daily wind ranges from about 9 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
309light breeze
319light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 12 min at the start of January to 9 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over January. Sunrise moves from 8:12 AM to 8:02 AM, and sunset from 5:26 PM to 5:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.28:125:26
29.28:125:27
39.38:125:27
49.38:125:28
59.38:125:29
69.38:125:30
79.38:125:31
89.38:125:32
99.38:125:32
109.48:125:33
119.48:125:34
129.48:125:35
139.48:115:36
149.48:115:37
159.58:115:38
169.58:105:39
179.58:105:40
189.58:105:41
199.68:095:42
209.68:095:44
219.68:085:45
229.68:085:46
239.78:075:47
249.78:075:48
259.78:065:49
269.78:065:50
279.88:055:51
289.88:045:52
299.88:035:54
309.98:035:55
319.98:025:56

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.01 kWh/m².

For context, solar energy here swings from a low near 1.73 kWh/m² to a high of 6.3 kWh/m² in June across the year — January's 2.01 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
11.8Dim
21.8Dim
31.8Dim
41.8Dim
51.8Dim
61.8Dim
71.8Dim
81.8Dim
91.9Dim
101.9Dim
111.9Dim
121.9Dim
131.9Dim
141.9Dim
152.0Dim
162.0Dim
172.0Moderate
182.0Moderate
192.1Moderate
202.1Moderate
212.1Moderate
222.2Moderate
232.2Moderate
242.2Moderate
252.3Moderate
262.3Moderate
272.3Moderate
282.4Moderate
292.4Moderate
302.4Moderate
312.5Moderate
Planning a trip in January

Is January a good time to visit Plainfield?

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

0.0
Sightseeing
12th-best month of the year
0.0
Beach & pool
10th-best month of the year

January is a weaker month for outdoor sightseeing in Plainfield.

What to pack for Plainfield in January

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

In January, Plainfield sees daytime highs around 36°F and nights near 22°F. Pack a warm layer and a heavy coat. Worth having: rain gear. About 9 days see rain.

a warm layera heavy coatrain gear

UV index in Plainfield in January

LowModerateHighVery highExtreme

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

Under clear skies, the midday UV index in Plainfield peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 11UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Plainfield in January

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Plainfield is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 1416 µg/m³Oct 218 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Moderate
Mar12Moderate
Apr12Good
May14Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Plainfield?

Plainfield sits at 39.7°N, 86.4°W, 732 ft above sea level, in United States. The nearest listed city is Avon, 4.3 mi away.

Topography around Plainfield

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

Within 2 miles, the terrain around Plainfield has only modest variations in elevation — a maximum elevation change of 187 ft around an average of 764 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 528 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 682 ft.

The land around Plainfield is covered by grassland (35%), trees (30%) and artificial surfaces (24%) within 2 miles, trees (31%), cropland (31%) and grassland (24%) within 10 miles, and cropland (52%) and trees (35%) within 50 miles.

2 miles
187 ft
10 miles
528 ft
50 miles
682 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Avon 4.3 mi · Fairfield Heights 8.7 mi · Brownsburg 9.3 mi · Indianapolis 14 mi · Greenwood 17 mi · Broad Ripple 17 mi · Zionsville 19 mi · Lawrence 22 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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Plainfield (39.7042°, -86.3994°, 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. 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).