Climate (Duplicate)Uehonmachi Hills Mark Heliport 2020-2024

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

Calculated from historical METAR data of Yao Airport (RJOY) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	95.1	95	92	97	90	98
February	93.1	86	89	100	98	95
March	92.7	79	92	93	94	95
April	94.9		92	94	94	95
May	94.5		93	94	93	96
June	93.4		90	96	95	92
July	95.4		94	97	95	93
August	97.3		96	98	92	99
September	95.6		95	97	96	98
October	93.7		95	93	99	95
November	96.2		95	95	97	99
December	96.9		94	98	96	100
Average	94.0	86.2	93.2	95.9	94.7	95.9

1st 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	98.8	99	98	100	96	99
February	99.0	99	97	100	99	99
March	97.6	91	98	98	98	99
April	98.9		97	100	99	99
May	98.6		97	98	99	99
June	98.6		97	99	99	98
July	99.1		100	99	98	99
August	99.2		98	100	98	100
September	99.1		99	100	100	99
October	98.5		100	97	100	100
November	99.1		100	99	98	100
December	98.9		99	100	98	100
Average	98.5	95.9	98.2	99.0	98.6	99.2

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	9.4	10	10	9	9	12
February	10.5	12	10	9	12	11
March	15.3	13	18	16	17	15
April	20.0		21	22	20	18
May	24.6		24	24	24	25
June	28.0		28	29	28	29
July	31.8		33	32	32	30
August	33.4		35	33	32	35
September	29.4		32	31	28	30
October	23.2		23	23	24	22
November	18.1		18	19	18	19
December	12.0		13	12	12	12
Average	20.2	11.7	22.1	21.8	21.5	21.5

17th 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	3.2	4	3	2	3	6
February	4.4	6	4	3	6	5
March	8.6	8	10	9	10	9
April	13.9		14	15	13	12
May	19.1		19	19	19	20
June	22.7		23	24	23	24
July	27.0		28	27	27	25
August	28.1		29	28	27	30
September	24.1		26	25	24	24
October	17.3		17	17	18	17
November	11.3		11	12	11	12
December	5.6		6	6	6	5
Average	14.3	5.7	15.9	15.9	15.5	15.6

58th 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	10.6	13	10	8	14	10
February	11.2	17	16	10	5	10
March	13.7	18	9	14	16	18
April	11.5		16	12	14	10
May	13.5		17	13	25	8
June	14.4		19	14	13	17
July	13.7		7	10	13	28
August	7.5		7	3	23	1
September	10.5		5	7	18	8
October	13.0		7	12	4	15
November	7.5		11	10	7	7
December	5.7		7	8	4	4
Average	11.7	16.0	10.9	10.2	13.3	11.7

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	7.5	7	7	7	8	7
February	7.1	6	6	9	8	7
March	7.0	8	6	6	6	7
April	7.5		7	7	7	9
May	6.8		7	6	7	7
June	6.2		6	7	5	6
July	6.5		7	6	6	6
August	7.4		8	7	7	7
September	6.1		6	7	5	6
October	5.9		6	5	6	6
November	5.3		6	5	6	5
December	7.3		7	8	9	8
Average	6.7	6.7	6.5	6.7	6.7	6.7

17th 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	288°	274°	290°	276°	289°
February	324°	317°	273°	281°	293°
March	290°	302°	293°	316°	301°
April		295°	304°	313°	286°
May		297°	284°	265°	279°
June		277°	279°	280°	283°
July		269°	268°	277°	258°
August		095°	271°	253°	268°
September		286°	056°	360°	276°
October		311°	336°	332°	006°
November		277°	314°	279°	304°
December		271°	275°	279°	275°

Prevailing wind direction

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