This page is a single place to check Cheonan climate: monthly averages. Cheonan runs from -1.7 C in Jan to 25.0 C in Aug, a swing of 26.7 C. Rain is strongly seasonal: Jul is the wettest month at 11.08 mm/day, while Jan runs at 0.70 mm/day, about 15.8x drier. Taken together that is roughly 1,224 mm of rain a year for the grid cell. Values come from a public open API; a successful result is cached so a later outage never blanks the page. Use the table for exact numbers, or the related pages below for neighbouring locations and periods.
Annual mean temperature 11.9 C
Warmest month Aug (25.0 C)
Coldest month Jan (-1.7 C)
Wettest month Jul (11.08 mm/day)
All-time record high 35.6 C
All-time record low -16.4 C
Annual precipitation 1,230 mm / year
Coordinates 36.8065, 127.1522
Population 658,831
Average monthly temperature and rainfall in Cheonan
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
-1.7
0.70
12.7
-14.8
Feb
0.0
1.13
16.3
-16.4
Mar
4.2
1.27
19.6
-7.2
Apr
10.0
2.55
25.8
-1.1
May
15.9
2.72
29.1
3.8
Jun
20.8
4.16
32.5
9.6
Jul
24.1
11.08
33.6
16.1
Aug
25.0
8.15
35.6
15.0
Sep
20.6
4.47
29.5
9.8
Oct
14.6
1.65
26.4
0.8
Nov
7.6
1.54
21.5
-3.2
Dec
0.6
0.83
15.6
-13.4
What the Cheonan climate table shows
Values are multi-decadal climatological averages for the 36.8065, 127.1522 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
How much rain is 11.08 mm/day in a month?
Rain is recorded as a daily mean, so 11.08 mm/day is roughly 337 mm across a 30-day month.
Does Cheonan get the same every year?
Close to it. Averaging decades smooths variation, so treat these as typical rather than guaranteed.