Climate Iejima Auxiliary Air Base 2020-2024

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

Calculated from historical METAR data of Kadena Air Base (RODN) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	84.2	87	85	76	90	86
February	72.5	56	73	67	76	89
March	71.0	69	71	55	68	68
April	69.8		55	60	75	82
May	63.0		62	38	70	57
June	69.8		61	65	63	79
July	76.9		81	74	67	78
August	74.5		63	77	73	74
September	75.6		74	69	80	76
October	82.9		87	71	88	87
November	85.3		91	70	92	87
December	79.9		77	62	91	70
Average	75.7	70.2	72.6	64.4	77.2	77.2

73rd best VFR conditions of Japan

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	97.9	99	99	99	98	97
February	96.5	99	94	95	96	99
March	94.1	94	97	85	98	95
April	95.0		92	96	97	97
May	89.7		92	77	98	88
June	91.2		88	91	88	97
July	97.4		99	95	96	99
August	95.5		83	100	100	95
September	96.4		97	94	98	99
October	97.6		100	94	100	97
November	98.3		100	97	99	99
December	95.3		97	82	99	96
Average	95.7	97.0	94.6	91.6	97.0	96.3

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	20.3	21	20	20	22	21
February	21.2	22	21	20	22	22
March	22.7	22	23	23	24	23
April	24.4		25	25	25	22
May	27.2		28	26	29	27
June	29.6		30	29	30	30
July	31.6		32	32	32	32
August	31.8		31	32	31	32
September	30.7		32	31	31	30
October	28.3		29	28	28	28
November	25.4		25	26	24	26
December	21.5		22	22	21	21
Average	25.9	21.7	26.6	26.2	26.6	26.0

9th highest temperature of Japan

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	12.8	13	12	13	11	14
February	14.6	17	15	14	13	14
March	15.3	16	16	16	14	14
April	17.2		15	19	17	14
May	21.5		21	21	23	22
June	23.2		20	25	25	24
July	25.4		23	25	26	25
August	25.4		20	26	26	27
September	24.7		25	25	25	24
October	21.6		22	22	22	21
November	18.2		18	18	17	19
December	15.4		16	16	14	16
Average	19.3	15.6	18.5	20.2	19.5	19.4

65th lowest temperature of Japan

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	12.9	13	11	21	13	8
February	12.6	11	10	25	10	7
March	11.4	16	9	13	7	14
April	12.9		15	18	9	11
May	16.7		7	38	6	23
June	16.9		21	24	16	13
July	7.7		8	14	10	6
August	8.8		20	7	2	16
September	12.7		15	19	6	15
October	8.3		4	19	7	7
November	8.5		8	17	9	5
December	19.7		22	30	13	29
Average	11.9	13.0	12.5	20.4	8.9	12.8

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	10.1	10	11	10	11	9
February	10.4	10	10	11	11	11
March	10.1	10	9	10	10	10
April	10.3		9	10	12	10
May	9.9		8	10	12	10
June	10.3		6	10	11	12
July	10.2		8	10	12	10
August	10.8		13	8	12	11
September	10.7		9	12	9	9
October	11.5		9	12	12	11
November	10.9		11	9	11	12
December	11.0		10	12	11	12
Average	10.5	10.0	9.3	10.3	11.1	10.7

9th highest wind speed of Japan

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	014°	011°	023°	028°	356°
February	096°	018°	031°	040°	058°
March	072°	045°	065°	050°	108°
April		061°	098°	055°	033°
May		097°	086°	198°	105°
June		207°	182°	201°	204°
July		145°	205°	103°	186°
August		213°	168°	164°	126°
September		064°	060°	094°	271°
October		037°	042°	045°	030°
November		033°	046°	035°	044°
December		055°	050°	023°	034°

Prevailing wind direction

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