Daejeon climate
Daejeon (South Korea) has a monsoon-influenced hot-summer humid continental climate (Köppen Dwa). The average temperature over the year is 12 °C54 °F, and about 1,225 mm48 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Daejeon climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 235 | −719 | −327 | 240.9 | 30 |
| Feb | 541 | −523 | 032 | 341.3 | 26 |
| Mar | 1151 | −130 | 541 | 461.8 | 22 |
| Apr | 1864 | 540 | 1152 | 813.2 | 4 |
| May | 2476 | 1152 | 1864 | 803.1 | 0 |
| Jun | 2984 | 1762 | 2373 | 1345.3 | 0 |
| Jul | 2985 | 2170 | 2577 | 31612 | 0 |
| Aug | 3085 | 2271 | 2678 | 25510 | 0 |
| Sep | 2577 | 1660 | 2069 | 1345.3 | 0 |
| Oct | 1967 | 847 | 1457 | 542.1 | 1 |
| Nov | 1253 | 135 | 744 | 411.6 | 14 |
| Dec | 439 | −523 | −131 | 261.0 | 29 |
| Year | 3085 | −719 | 1254 | 1,22548 | 127 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 81% | 56% | 2.5 | 9:56 |
| Feb | 76% | 55% | 3.2 | 10:49 |
| Mar | 74% | 53% | 4.2 | 11:52 |
| Apr | 72% | 56% | 5.0 | 13:05 |
| May | 71% | 58% | 5.6 | 14:05 |
| Jun | 71% | 70% | 5.1 | 14:37 |
| Jul | 84% | 78% | 4.2 | 14:24 |
| Aug | 84% | 71% | 4.4 | 13:32 |
| Sep | 82% | 65% | 4.0 | 12:21 |
| Oct | 79% | 50% | 3.6 | 11:11 |
| Nov | 79% | 53% | 2.5 | 10:11 |
| Dec | 80% | 54% | 2.2 | 9:41 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Daejeon is like
The warmest month is August, with an average high of 30 °C85 °F and a low of 22 °C71 °F. The coldest is January, when highs average 2 °C35 °F and lows −7 °C19 °F. Seasons are strongly marked: the warmest month is on average 28.4 °C51 °F warmer than the coldest.
It is wet, with about 1,225 mm48 in of precipitation per year. The wettest three-month stretch is July–September, which brings 58% of the annual total. The wettest month is July (316 mm12 in), the driest is January (24 mm0.9 in).
Relative humidity ranges from 71% in May to 84% in July. The clearest skies (lowest average cloud amount, 50%) are typical of October. Average wind speed near the ground ranges from 7 km/h (4 mph) in October to 10 km/h (6 mph) in April. Daylight lasts from about 9.7 hours in December to 14.6 hours in June.
A lasting snow cover is typical in December–February. In those months the average snow depth in the reanalysis exceeds 10 cm. It is deepest in January, at about 14 cm.
Best time to visit Daejeon
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May and October. Average highs then reach 19 °C67 °F to 24 °C76 °F. Precipitation is 54 mm2.1 in to 80 mm3.1 in per month.
The most challenging month is January, which is cold, with average highs of 2 °C35 °F.
Comfort score: months are ranked by how close they come to an ideal. That means an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Daejeon
- Winter (December–February) — highs 235 to 5 °C41 °F, lows −719 to −5 °C23 °F, about 28 mm1.1 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Spring (March–May) — highs 1151 to 24 °C76 °F, lows −130 to 11 °C52 °F, about 69 mm2.7 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 2984 to 30 °C85 °F, lows 1762 to 22 °C71 °F, about 235 mm9.3 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Autumn (September–November) — highs 1253 to 25 °C77 °F, lows 135 to 16 °C60 °F, about 76 mm3.0 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
How Daejeon compares
The nearest larger place is Daegu, about 121 km to the southeast. Compared with it, Daejeon is on average 0.4 °C0.8 °F cooler. It receives a similar amount of precipitation. The difference is largest in February (0.8 °C1.5 °F cooler).
World Climates covers 34 places in South Korea. By annual mean temperature, Daejeon is the 21st warmest of them. By annual precipitation, it is the 25th wettest. See all of them on the South Korea climate page.
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are Wŏnsan (North Korea, Dwa), Chongdan-up (North Korea, Dwa) and Kangnyŏng (North Korea, Dwa).
The same NASA POWER grid cell also contains Cheongju-si (pop. 852,147) and Sejong (pop. 394,630). Their long-term averages in this dataset are essentially the same as for Daejeon, so they do not have separate pages.
Nearby places
- Climate in Cheonan 55 km · 12 °C53 °F · 1,232 mm48 in
- Climate in Iksan 59 km · 13 °C55 °F · 1,267 mm50 in
- Climate in Jeonju 62 km · 12 °C54 °F · 1,267 mm50 in
- Climate in Sangju 70 km · 12 °C54 °F · 1,141 mm45 in
- Climate in Chungju 85 km · 12 °C53 °F · 1,221 mm48 in
- Climate in Gumi 89 km · 12 °C54 °F · 1,215 mm48 in
- Climate in Jeongeup 93 km · 13 °C55 °F · 1,303 mm51 in
- Climate in Osan 94 km · 12 °C54 °F · 1,232 mm48 in
Frequently asked questions
What is the warmest month in Daejeon?
August is the warmest month in Daejeon. Its average high is 30 °C (85 °F) and its average low is 22 °C (71 °F).
What is the coldest month in Daejeon?
January is the coldest month. Its average high is 2 °C (35 °F) and its average low is -7 °C (19 °F).
When does it rain the most in Daejeon?
July is the wettest month with about 316 mm (12.4 in) of precipitation. January is the driest with about 24 mm (0.9 in).
What is the best time to visit Daejeon?
Judging by long-term averages, the most comfortable months are May and October.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station. So they can differ from airport records. The gaps are largest on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 198 m, while Daejeon lies at about 58 m. Temperatures on this page were therefore adjusted by +0.9 °C1.6 °F using the standard lapse rate of 6.5 °C per 1,000 m.