Climate Tinian Star Heliport 2020-2024

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

Calculated from historical METAR data of Francisco C Ada/Saipan International Airport (PGSN) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	90.6	91	71	89	100	98
February	89.4	90	82	90	100	93
March	92.0	87	87	86	100	95
April	94.0		79	95	98	97
May	95.3		84	96	98	98
June	96.9		94	93	100	99
July	93.1		92	86	94	96
August	91.1		83	95	93	94
September	92.2		83	93	95	97
October	89.5		83	88	97	98
November	90.9		88	95	95	96
December	94.3		91	89	98	95
Average	92.2	89.5	84.2	91.2	97.1	96.2

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	97.3	98	91	97	100	100
February	97.6	98	95	98	100	97
March	99.4	99	99	97	100	100
April	98.8		95	100	100	100
May	98.6		93	100	100	100
June	99.3		98	99	100	100
July	98.0		97	96	98	100
August	97.4		94	98	98	100
September	98.0		97	100	98	100
October	94.5		94	94	100	100
November	95.8		99	100	98	100
December	98.0		98	97	100	99
Average	97.9	98.4	95.7	97.9	99.2	99.5

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	29.4	29	29	29	31	30
February	29.5	30	29	30	31	30
March	30.3	31	30	30	32	31
April	30.9		31	30	32	32
May	31.5		31	31	32	33
June	31.7		31	32	32	33
July	31.4		31	30	31	32
August	31.1		31	31	31	32
September	31.0		31	32	31	31
October	29.6		31	31	31	31
November	30.7		31	32	31	32
December	30.1		30	31	30	30
Average	30.5	29.6	30.4	30.6	31.1	31.3

25th 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	2024	2023	2022	2021	2020
January	23.2	24	22	22	26	25
February	23.9	23	25	25	25	25
March	24.0	24	24	25	26	25
April	25.0		26	25	26	26
May	24.6		23	26	26	27
June	25.8		23	25	27	28
July	24.6		22	22	25	26
August	25.0		26	19	26	27
September	26.2		26	27	26	27
October	23.8		25	26	26	26
November	23.6		26	24	25	26
December	23.8		26	23	25	26
Average	24.3	23.5	24.2	23.9	25.8	26.2

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	8.5	6	22	10	4	3
February	7.1	6	11	6	3	10
March	3.4	3	5	11	1	2
April	5.1		12	2	5	0
May	2.7		9	1	2	1
June	5.0		4	4	8	3
July	10.6		12	15	11	7
August	12.9		26	10	11	7
September	10.8		13	4	8	10
October	13.3		14	22	14	9
November	7.2		7	4	15	5
December	6.2		8	10	4	9
Average	7.4	5.1	12.2	8.4	7.1	5.4

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	14.2	13	15	14	13	15
February	15.0	15	16	15	13	16
March	13.6	14	13	14	14	14
April	13.3		14	15	10	14
May	12.5		13	12	15	14
June	11.2		13	11	9	13
July	10.2		11	10	10	12
August	8.8		7	8	10	9
September	9.0		9	8	10	8
October	9.8		13	9	8	10
November	12.7		14	12	12	13
December	14.5		15	14	13	15
Average	12.3	14.0	12.6	11.8	11.3	12.5

25th 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	2024	2023	2022	2021	2020
January	062°	069°	059°	082°	069°
February	062°	071°	063°	087°	063°
March	068°	071°	079°	081°	075°
April		082°	091°	101°	078°
May		093°	083°	081°	090°
June		090°	091°	120°	085°
July		093°	105°	110°	088°
August		193°	108°	097°	093°
September		119°	146°	096°	121°
October		093°	106°	105°	106°
November		080°	070°	085°	083°
December		073°	081°	073°	078°

Prevailing wind direction

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