Climate Guiren Airport / Guiren Army Airfield 2020-2024

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

Calculated from historical METAR data of Tainan International Airport / Tainan Air Base (RCNN) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	67.7	77	73	61	67	78
February	71.8	85	68	60	69	77
March	75.8	79	92	61	74	85
April	85.0		81	87	85	94
May	77.1		79	57	89	80
June	74.3		77	83	64	84
July	73.3		72	76	69	80
August	60.5		55	75	67	58
September	84.1		71	84	82	93
October	86.6		74	92	96	90
November	80.3		93	69	90	79
December	81.3		85	91	82	81
Average	76.6	80.3	76.3	73.8	77.7	81.4

2nd best VFR conditions of Taiwan

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	89.1	95	93	93	87	91
February	91.4	97	88	89	89	96
March	93.4	96	99	89	92	96
April	96.9		97	99	98	100
May	94.5		97	90	98	91
June	93.4		95	98	91	99
July	94.8		94	97	95	99
August	88.9		92	93	87	93
September	97.9		92	99	100	100
October	98.8		97	100	100	100
November	93.9		99	86	98	97
December	95.1		93	98	95	95
Average	94.1	96.1	94.5	94.1	94.0	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	23.4	24	24	23	22	24
February	24.3	26	25	22	25	25
March	26.4	26	27	27	27	27
April	28.4		29	28	29	28
May	30.2		30	29	32	31
June	31.1		32	32	30	32
July	31.5		32	32	31	32
August	30.6		31	32	30	31
September	31.5		32	32	32	32
October	29.8		30	30	30	30
November	28.0		28	30	27	28
December	24.5		25	25	24	25
Average	27.9	25.1	28.6	28.5	28.2	28.7

2nd highest temperature of Taiwan

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	13.7	12	14	14	11	14
February	14.5	15	15	13	14	15
March	17.0	17	16	18	18	18
April	20.0		21	20	20	19
May	23.5		24	22	25	25
June	24.8		26	25	24	25
July	25.0		26	26	25	26
August	24.6		25	25	25	24
September	24.5		25	25	25	24
October	21.9		23	22	22	22
November	19.1		18	21	18	20
December	15.6		16	16	15	16
Average	19.7	14.8	20.6	20.7	20.2	20.6

2nd lowest temperature of Taiwan

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	3.9	1	3	10	3	3
February	3.5	0	0	15	3	0
March	3.9	3	1	8	0	2
April	4.1		4	6	3	2
May	12.5		10	28	5	14
June	15.5		11	15	25	6
July	15.4		18	14	16	12
August	21.9		17	18	25	21
September	7.8		25	7	6	3
October	4.9		11	5	8	2
November	2.7		0	0	3	7
December	4.9		8	3	4	5
Average	7.8	1.3	9.4	11.3	8.5	6.6

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	7.4	7	8	8	7	8
February	7.5	8	8	8	6	7
March	6.8	7	7	6	6	7
April	6.9		8	8	7	8
May	6.2		7	6	7	7
June	6.3		7	6	5	6
July	6.2		7	6	6	6
August	5.8		6	6	6	6
September	6.1		6	7	6	6
October	6.0		6	6	6	6
November	6.1		6	5	7	6
December	7.7		7	10	7	8
Average	6.6	7.2	6.9	6.7	6.2	6.5

2nd highest wind speed of Taiwan

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	350°	351°	357°	348°	352°
February	339°	349°	359°	324°	338°
March	312°	328°	335°	329°	319°
April		305°	315°	305°	331°
May		281°	311°	238°	250°
June		232°	221°	206°	233°
July		243°	242°	276°	242°
August		236°	257°	226°	244°
September		244°	315°	297°	299°
October		320°	325°	310°	315°
November		334°	329°	344°	333°
December		356°	001°	354°	358°

Prevailing wind direction

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