Climate Cat Bi International Airport 2020-2024

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

Calculated from historical METAR data of Cat Bi International Airport (VVCI) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	55.9	54	75	53	64	64
February	45.3	28	51	39	70	48
March	39.6	32	50	47	40	35
April	44.8		30	59	37	53
May	63.4		62	66	54	64
June	84.5		83	88	96	87
July	85.2		85	85	87	86
August	83.8		84	86	86	81
September	87.3		81	86	93	82
October	83.8		92	90	67	84
November	77.2		85	74	76	76
December	70.1		64	80	76	76
Average	66.3	38.2	70.2	70.9	70.1	69.7

6th best VFR conditions of Vietnam

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	85.3	84	92	88	88	92
February	79.2	70	81	67	92	82
March	79.4	76	85	80	74	79
April	87.9		78	92	93	85
May	97.4		98	96	99	100
June	98.5		98	99	99	99
July	98.3		99	98	97	100
August	97.6		98	98	99	97
September	97.6		97	98	98	99
October	96.3		99	96	90	96
November	95.2		98	97	97	93
December	92.6		96	99	94	96
Average	90.9	76.6	93.4	92.3	93.2	93.2

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	20.6	21	21	21	19	22
February	21.6	22	23	18	24	22
March	24.2	24	24	25	24	25
April	26.7		27	27	27	25
May	30.5		31	29	31	32
June	32.9		32	33	34	34
July	32.7		34	33	33	34
August	31.7		32	32	33	31
September	31.4		31	32	31	31
October	28.7		31	29	27	28
November	26.6		28	29	25	27
December	22.0		23	21	23	21
Average	27.1	22.2	27.9	27.5	27.6	27.5

8th highest temperature of Vietnam

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	15.8	17	15	16	14	18
February	16.7	17	18	13	18	18
March	19.9	20	19	20	20	21
April	22.2		23	21	24	19
May	25.0		26	22	25	26
June	27.1		27	27	26	28
July	26.9		28	25	27	29
August	26.4		27	26	27	26
September	25.2		26	25	23	26
October	22.7		25	23	21	22
November	20.4		21	23	19	21
December	15.7		17	15	15	15
Average	21.7	17.7	22.6	21.6	21.5	22.4

2nd lowest temperature of Vietnam

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	7.6	11	6	7	0	4
February	11.8	11	12	21	6	12
March	10.6	11	7	8	11	16
April	8.5		11	4	5	12
May	5.1		2	8	3	2
June	5.5		10	4	5	3
July	9.0		6	6	7	2
August	13.9		13	14	9	23
September	11.1		15	18	12	14
October	9.3		1	10	24	14
November	4.4		3	4	3	6
December	5.2		3	1	1	1
Average	8.8	10.9	7.4	8.8	7.0	9.0

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	5.7	6	5	5	5	6
February	5.5	5	6	4	6	6
March	5.7	5	6	6	6	6
April	6.5		6	7	7	6
May	7.8		8	7	9	8
June	7.9		7	7	8	10
July	7.3		8	7	7	9
August	6.4		6	6	6	7
September	6.0		6	5	6	6
October	6.6		6	7	7	7
November	5.9		6	7	6	6
December	5.3		5	5	5	5
Average	6.3	5.5	6.2	6.1	6.4	6.8

8th highest wind speed of Vietnam

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	086°	073°	082°	079°	101°
February	109°	103°	061°	123°	094°
March	105°	124°	121°	123°	120°
April		119°	125°	130°	100°
May		132°	115°	158°	151°
June		143°	176°	167°	168°
July		152°	140°	158°	163°
August		160°	137°	144°	129°
September		069°	086°	089°	120°
October		073°	063°	032°	030°
November		102°	114°	085°	077°
December		077°	049°	085°	074°

Prevailing wind direction

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