Climate Jialaishi Air Base 2020-2024

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

Calculated from historical METAR data of Haikou Meilan International Airport (ZJHK) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	42.3	48	33	36	54	60
February	49.4	46	49	24	62	51
March	60.6	48	64	54	51	69
April	71.0	85	58	70	73	59
May	81.1		70	65	92	96
June	92.8		86	93	94	93
July	88.3		84	83	90	93
August	89.3		87	87	90	92
September	85.6		75	87	85	90
October	69.3		51	76	60	50
November	60.2		59	42	72	54
December	48.6		38	51	46	41
Average	68.9	56.6	63.5	65.1	73.1	71.5

34th best VFR conditions of China

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	77.1	89	70	82	78	93
February	79.3	68	90	64	86	90
March	88.1	74	89	82	95	96
April	93.2	95	96	88	99	86
May	96.8		94	93	100	100
June	98.4		98	98	98	99
July	98.6		98	99	100	99
August	97.7		98	98	99	98
September	97.9		96	97	99	98
October	95.5		94	94	93	94
November	92.7		95	94	97	93
December	84.0		82	76	82	83
Average	90.7	81.7	91.7	89.4	93.8	94.3

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	22.1	24	20	24	20	24
February	23.8	25	25	20	25	25
March	28.1	27	28	28	29	30
April	30.5	35	30	29	31	28
May	33.1		33	30	35	36
June	34.1		34	34	35	35
July	33.7		35	34	34	36
August	32.8		34	32	34	33
September	32.0		31	32	32	32
October	28.9		29	28	28	28
November	26.8		28	28	27	26
December	22.5		23	20	22	21
Average	28.8	27.8	29.1	28.5	29.2	29.4

2nd highest temperature of China

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	16.0	17	15	17	13	17
February	17.0	18	18	16	16	18
March	20.5	21	19	21	21	22
April	23.0	26	24	21	24	21
May	25.0		25	24	26	26
June	26.0		26	26	26	26
July	25.8		26	26	26	26
August	25.4		26	25	25	25
September	24.7		25	24	25	25
October	22.9		24	22	23	24
November	21.1		21	22	20	22
December	17.3		18	16	17	17
Average	21.8	20.3	22.3	21.8	21.8	22.4

37th lowest temperature of China

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	13.7	15	23	6	12	5
February	11.6	19	6	29	7	8
March	7.4	19	8	4	6	4
April	7.4	4	5	10	7	14
May	5.6		9	13	1	1
June	5.2		9	4	6	2
July	7.2		6	8	3	4
August	8.4		8	9	7	7
September	10.9		19	14	9	9
October	14.1		21	12	23	22
November	9.0		9	14	1	6
December	14.1		17	26	13	15
Average	9.9	14.0	11.5	11.6	7.7	7.8

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	9.4	10	9	9	9	9
February	8.7	8	10	9	8	9
March	8.4	8	8	8	9	8
April	8.5	9	8	9	8	9
May	7.4		8	8	8	7
June	6.8		6	7	7	8
July	7.2		7	7	7	8
August	6.4		6	7	7	6
September	6.8		6	7	7	6
October	10.4		10	11	11	13
November	10.2		11	9	10	12
December	10.2		9	10	11	10
Average	8.4	8.8	8.1	8.2	8.3	8.6

2nd highest wind speed of China

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	069°	035°	065°	042°	076°
February	089°	079°	051°	065°	074°
March	105°	087°	083°	102°	124°
April	162°	117°	082°	115°	073°
May		121°	086°	159°	156°
June		167°	170°	165°	175°
July		175°	108°	195°	165°
August		268°	107°	203°	116°
September		064°	044°	059°	086°
October		059°	053°	053°	058°
November		060°	064°	057°	054°
December		049°	033°	043°	042°

Prevailing wind direction

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