Climate Delingha Airport 2020-2024

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

Calculated from historical METAR data of Lanzhou Zhongchuan International Airport (ZLLL) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	72.6	89	82	59	88	39
February	78.7	48	54	78	97	97
March	83.0	87	86	77	65	96
April	83.8		63	78	81	97
May	90.4		92	88	91	96
June	96.2		97	98	93	99
July	94.6		98	95	100	94
August	90.1		95	90	96	92
September	92.6		90	97	94	93
October	85.2		89	93	82	91
November	80.4		88	88	85	60
December	75.8		92	54	77	76
Average	84.8	75.1	86.0	84.7	87.6	86.9

6th 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	89.6	97	97	90	94	70
February	90.3	69	76	91	100	99
March	93.1	97	90	93	79	98
April	94.8		88	93	95	99
May	96.9		99	93	97	100
June	99.0		99	99	98	100
July	98.8		99	99	100	100
August	97.6		98	100	99	98
September	98.0		98	99	99	99
October	96.3		99	99	96	97
November	93.5		97	97	97	88
December	94.7		100	94	99	90
Average	94.6	88.1	95.0	95.8	95.9	95.2

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	0.2	2	-1	2	-1	1
February	3.6	2	3	0	8	6
March	11.6	11	12	14	13	11
April	15.8		14	17	14	16
May	20.6		20	22	21	21
June	24.9		25	27	25	25
July	27.2		28	28	29	26
August	24.7		27	25	26	25
September	20.5		22	22	22	19
October	13.4		15	15	12	13
November	7.2		8	9	6	7
December	0.6		3	-2	2	-1
Average	13.1	4.8	14.7	15.2	14.7	14.0

33rd 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	-16.6	-14	-16	-14	-17	-14
February	-12.5	-11	-10	-13	-9	-13
March	-4.5	-3	-3	-1	-3	-5
April	2.0		2	3	3	0
May	7.6		9	8	8	7
June	12.4		13	14	13	12
July	14.6		15	15	16	14
August	13.7		14	16	13	13
September	9.0		11	9	10	9
October	1.7		3	3	2	1
November	-7.1		-6	-5	-10	-6
December	-15.7		-13	-15	-13	-15
Average	-1.6	-10.7	1.6	2.1	1.0	0.3

4th 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	4.6	2	0	2	5	10
February	7.4	14	13	11	1	2
March	2.0	1	2	0	2	2
April	7.2		9	3	11	3
May	7.3		4	4	8	10
June	7.0		2	4	6	4
July	8.3		7	6	4	11
August	9.2		4	7	6	10
September	7.3		7	4	9	7
October	6.1		12	3	5	4
November	4.3		4	4	3	3
December	4.5		1	3	0	5
Average	6.2	5.3	5.4	4.2	5.1	6.0

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	4.4	5	5	4	5	4
February	5.2	5	5	5	6	5
March	6.0	6	7	7	6	6
April	6.8		8	7	7	6
May	6.8		8	7	7	7
June	6.1		7	7	6	6
July	5.8		6	6	6	6
August	5.5		6	6	6	6
September	5.0		5	5	6	5
October	4.7		5	5	5	5
November	4.8		5	5	5	5
December	4.4		5	4	4	4
Average	5.5	5.2	5.9	6.0	5.8	5.6

33rd 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	098°	086°	107°	088°	137°
February	069°	083°	069°	105°	131°
March	082°	071°	066°	098°	072°
April		058°	061°	078°	083°
May		068°	091°	024°	019°
June		121°	065°	063°	104°
July		079°	082°	107°	114°
August		060°	071°	076°	102°
September		102°	122°	109°	102°
October		113°	084°	085°	090°
November		095°	084°	088°	104°
December		105°	080°	121°	100°

Prevailing wind direction

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