Climate Diego Garcia Naval Support Facility 2020-2024

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

Calculated from historical METAR data of Diego Garcia Naval Support Facility (FJDG) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	97.4	98	99	99	99	94
February	97.9	98	97	97	99	99
March	98.4	100	100	98	99	96
April	98.8		98	98	100	100
May	98.8		98	98	99	100
June	98.1		99	95	99	98
July	98.1		99	97	98	99
August	97.7		94	96	99	100
September	98.6		98	98	99	100
October	98.1		98	100	99	99
November	98.6		100	96	99	99
December	97.4		97	96	98	99
Average	98.2	98.4	98.0	97.2	98.8	98.3

1st best VFR conditions of British Indian Ocean Territory

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	98.8	99	100	99	99	98
February	98.7	99	99	98	100	99
March	98.9	100	100	99	99	98
April	99.1		98	98	100	100
May	99.3		99	99	100	100
June	98.9		100	97	100	99
July	98.9		100	100	98	99
August	99.2		98	99	99	100
September	99.2		99	99	99	100
October	98.9		99	100	100	99
November	99.2		100	98	99	100
December	98.6		98	97	100	99
Average	99.0	99.1	99.1	98.6	99.3	99.1

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	31.3	31	31	33	30	33
February	32.1	33	32	31	31	33
March	32.1	33	32	31	32	32
April	31.9		31	32	32	32
May	31.6		31	31	32	32
June	29.9		29	30	30	31
July	29.3		30	28	29	30
August	29.3		29	28	29	29
September	30.1		30	30	30	30
October	31.4		31	31	31	33
November	31.7		31	31	31	32
December	31.6		31	32	33	31
Average	31.2	32.4	30.6	30.5	30.7	31.4

1st highest temperature of British Indian Ocean Territory

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	26.2	27	26	27	26	26
February	26.2	27	26	26	26	27
March	26.5	26	26	27	27	27
April	26.5		27	27	27	27
May	26.5		26	27	27	27
June	25.7		26	26	25	26
July	25.3		26	25	25	26
August	25.1		26	25	25	25
September	25.5		26	25	25	25
October	26.1		27	26	26	26
November	26.3		28	26	26	26
December	26.0		27	26	26	26
Average	26.0	26.7	26.3	25.7	25.8	26.2

1st lowest temperature of British Indian Ocean Territory

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	10.4	14	8	10	8	12
February	9.3	8	13	15	9	10
March	6.3	4	3	11	5	13
April	4.9		7	5	2	4
May	4.6		7	10	5	1
June	8.1		12	14	7	8
July	8.3		7	14	6	9
August	8.2		15	12	8	6
September	9.0		8	6	12	5
October	8.0		4	4	12	3
November	6.5		0	13	6	12
December	11.0		11	14	10	10
Average	8.0	8.5	7.7	10.4	7.5	7.7

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	9.0	8	9	8	12	8
February	8.4	7	9	10	9	10
March	7.9	6	7	8	8	7
April	7.4		8	5	7	8
May	9.7		10	8	10	9
June	10.8		11	10	11	12
July	12.4		12	13	12	12
August	12.7		14	12	12	13
September	10.4		13	10	11	9
October	9.5		13	9	10	8
November	8.1		11	7	8	7
December	7.8		9	5	7	8
Average	9.2	7.2	10.4	8.8	9.5	9.2

1st highest wind speed of British Indian Ocean Territory

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	338°	282°	327°	258°	335°
February	344°	304°	302°	270°	310°
March	162°	125°	281°	274°	295°
April		141°	177°	122°	283°
May		144°	130°	115°	122°
June		159°	125°	129°	119°
July		159°	136°	129°	122°
August		161°	136°	134°	132°
September		155°	137°	130°	130°
October		143°	147°	130°	145°
November		140°	121°	150°	296°
December		142°	310°	092°	264°

Prevailing wind direction

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