Statistics Charleston Air Force Base/International 2019-2023

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

Calculated from historical METAR data of Charleston Air Force Base/International (KCHS) between 2019 and 2023.

VFR conditions (%)

Month	Average	2023	2022	2021	2020	2019
January	82.2	74	84	81	86	84
February	77.7	78	82	62	77	70
March	85.7	86	78	90	82	86
April	90.6	87	93	98	92	84
May	90.1	79	88	95	88	96
June	89.9	89	95	88	84	91
July	91.3	86	86	92	94	94
August	90.4	91	87	87	91	92
September	90.4		89	95	85	88
October	84.9		82	85	85	75
November	81.3		75	94	89	78
December	78.8		83	83	82	78
Average	86.7	84.1	85.5	88.0	86.4	85.5

661st best VFR conditions of United States

VFR conditions during daylight period

Percentage of observations where the VFR minimums for ceiling and visibility are met:

• Visibility: 5 mi or more
• Ceiling: 3,000 ft or more

Only observations between sunrise and sunset are taken into account.

Marginal VFR conditions (%)

Month	Average	2023	2022	2021	2020	2019
January	89.7	84	88	91	94	91
February	87.9	87	91	75	87	83
March	94.0	95	87	96	92	95
April	96.8	95	98	100	98	94
May	97.1	96	96	99	96	99
June	97.2	98	98	97	97	97
July	96.6	94	94	97	98	97
August	96.6	96	95	95	98	98
September	95.1		94	98	93	94
October	94.9		93	95	93	93
November	90.4		88	98	96	88
December	87.5		93	91	89	88
Average	94.1	93.4	93.1	94.8	94.3	93.6

Marginal VFR conditions or better during daylight period

Percentage of observations where the MVFR minimums for ceiling and visibility are met:

• Visibility: 3⅛ mi or more
• Ceiling: 1,000 ft or more

Only observations between sunrise and sunset are taken into account.

Maximum temperatures (°C)

Month	Average	2023	2022	2021	2020	2019
January	16.5	19	15	16	18	16
February	19.9	23	19	16	18	21
March	21.6	22	23	22	23	20
April	24.9	26	24	25	25	25
May	28.4	27	29	28	27	31
June	30.6	30	32	30	30	31
July	32.3	34	32	31	33	33
August	31.6	33	31	31	32	32
September	29.8		29	29	29	31
October	26.0		24	26	27	27
November	20.4		22	19	23	19
December	17.6		18	21	16	18
Average	25.2	26.6	24.9	24.3	25.0	25.2

552nd highest temperature of United States

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°C)

Month	Average	2023	2022	2021	2020	2019
January	5.9	8	3	6	8	6
February	8.9	11	8	6	8	9
March	10.3	12	11	10	13	9
April	13.6	15	13	13	13	14
May	18.3	17	19	16	18	20
June	21.7	21	22	22	22	22
July	23.7	24	24	23	24	23
August	23.5	24	23	23	24	23
September	21.1		20	20	21	22
October	16.3		13	16	18	18
November	9.6		12	6	13	7
December	7.6		9	10	5	8
Average	15.2	16.5	15.1	14.3	15.4	15.0

2,301st lowest temperature of United States

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2023	2022	2021	2020	2019
January	7.0	8	5	8	10	5
February	7.2	7	5	14	13	6
March	5.5	7	8	5	7	3
April	3.9	5	3	2	5	5
May	4.2	7	4	2	4	1
June	5.1	4	3	7	4	8
July	3.6	4	4	5	3	2
August	5.6	8	7	5	6	4
September	6.4		8	7	7	6
October	4.3		1	5	4	6
November	7.4		9	5	9	9
December	8.6		4	6	5	11
Average	5.5	6.1	5.0	5.7	6.1	5.2

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	2023	2022	2021	2020	2019
January	8.2	7	9	8	9	8
February	8.6	8	9	9	9	7
March	9.4	9	10	9	9	9
April	9.2	9	9	9	10	10
May	8.7	9	9	9	8	8
June	7.6	8	7	8	8	8
July	6.9	7	8	7	6	7
August	6.5	7	6	6	6	7
September	7.8		8	7	8	8
October	7.5		7	7	8	8
November	7.8		9	8	8	8
December	7.5		7	7	7	9
Average	8.0	7.9	8.1	7.8	8.0	7.9

552nd highest wind speed of United States

Average wind speed

Excluding wind gusts. Only observations between sunrise and sunset are taken into account.

Prevailing wind direction

Month	2023	2022	2021	2020	2019
January	244°	321°	272°	297°	301°
February	245°	180°	303°	254°	291°
March	238°	199°	093°	209°	246°
April	167°	185°	242°	246°	196°
May	044°	196°	193°	194°	194°
June	208°	128°	177°	243°	208°
July	217°	209°	206°	198°	199°
August	195°	198°	178°	196°	181°
September		026°	073°	042°	060°
October		010°	337°	055°	081°
November		022°	346°	053°	357°
December		005°	253°	296°	340°

Prevailing wind direction

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