Climate Suwon Airport 2020-2024

Climate and trends: average temperature, flight conditions, precipitation, wind speed and direction.

Calculated from historical METAR data of Osan Air Base (RKSO) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	78.1	66	73	76	89	79
February	78.3	62	81	85	82	75
March	79.1	85	86	63	81	89
April	87.3	92	73	90	89	96
May	82.9		83	95	70	79
June	80.8		77	69	85	90
July	74.0		56	82	84	79
August	80.2		87	68	85	68
September	87.2		80	89	89	87
October	89.9		93	82	86	95
November	80.8		79	80	78	87
December	79.0		75	77	76	86
Average	81.7	76.6	78.2	79.4	82.7	84.5

10th best VFR conditions of South Korea

VFR conditions during daylight period

Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.

Marginal VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	87.6	88	80	87	95	91
February	88.2	87	89	93	90	81
March	89.0	97	94	81	86	97
April	94.1	96	85	98	96	99
May	93.1		94	98	86	96
June	94.4		94	94	94	97
July	91.9		86	93	96	96
August	94.6		94	92	96	94
September	95.7		92	95	98	93
October	95.4		96	92	96	97
November	92.0		94	91	89	97
December	89.3		88	85	95	94
Average	92.1	91.9	90.5	91.7	93.1	94.2

Marginal VFR conditions or better during daylight period

Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.

Maximum temperatures (°C)

Month	Average	2024	2023	2022	2021	2020
January	2.9	4	3	3	1	6
February	5.7	8	7	4	7	7
March	12.5	12	16	12	14	13
April	18.4	22	19	20	19	17
May	23.3		25	24	22	23
June	27.4		28	28	28	28
July	30.0		31	31	32	27
August	30.6		32	29	30	30
September	26.1		28	27	27	25
October	19.8		21	19	21	20
November	12.3		12	15	13	13
December	4.1		6	2	6	4
Average	16.6	11.5	18.8	18.4	18.3	17.5

9th highest temperature of South Korea

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°C)

Month	Average	2024	2023	2022	2021	2020
January	-7.2	-5	-7	-9	-9	-3
February	-5.8	0	-4	-7	-4	-2
March	1.4	1	1	1	2	1
April	7.1	10	7	7	7	4
May	12.7		13	12	12	13
June	18.6		19	19	18	19
July	21.7		15	23	23	21
August	22.3		21	22	22	23
September	17.2		19	16	18	16
October	9.0		9	8	11	7
November	2.4		1	3	2	2
December	-5.0		-3	-8	-5	-6
Average	6.9	1.4	7.6	7.8	8.2	7.9

2nd lowest temperature of South Korea

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	7.7	20	9	5	4	9
February	7.4	22	0	4	2	14
March	6.0	10	2	10	9	2
April	7.0	9	10	3	7	4
May	7.3		15	0	11	7
June	5.9		7	10	5	5
July	10.9		23	13	1	5
August	11.9		13	18	11	11
September	9.1		14	8	5	11
October	5.9		6	9	6	0
November	4.9		7	5	7	4
December	8.7		15	20	4	4
Average	8.0	14.8	10.3	8.5	6.0	6.1

Precipitation during daylight period

Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.

Wind speed (knots)

Month	Average	2024	2023	2022	2021	2020
January	5.4	5	6	5	6	5
February	6.4	6	5	8	7	6
March	7.1	8	6	7	6	8
April	7.5	5	8	8	7	11
May	7.3		6	8	7	6
June	6.3		6	7	6	6
July	5.9		6	6	6	5
August	5.8		5	6	6	6
September	5.8		4	6	7	6
October	5.1		4	5	5	6
November	5.0		6	5	5	6
December	5.2		5	4	5	6
Average	6.1	6.2	5.7	6.2	6.2	6.5

9th highest wind speed of South Korea

Average wind speed

Excluding wind gusts. Only observations between sunrise and sunset are taken into account.

Prevailing wind direction

Month	2024	2023	2022	2021	2020
January	321°	281°	286°	282°	294°
February	360°	293°	283°	271°	285°
March	265°	279°	253°	266°	275°
April	267°	257°	262°	269°	272°
May		249°	261°	257°	250°
June		266°	219°	233°	261°
July		217°	217°	167°	340°
August		289°	233°	160°	203°
September		037°	062°	110°	275°
October		307°	303°	257°	294°
November		279°	288°	280°	296°
December		314°	278°	287°	294°

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.