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Rongelap, Marshall Islands climate

Aw Tropical savanna (dry winter)

Rongelap has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is October with an average daily high near 83°F, while the coldest is February averaging around 80°F at night. Precipitation totals about 41 inches a year and is strongly seasonal — October alone averages 6.5 inches while February barely receives 0.93 inches.

☀️ All year

Warm

Daytime highs near 83°F most of the year.

🌙 Nights

Stays warm

Even the coolest nights stay near 80°F.

🌧️ Rain

Wet

About 41 in of rain a year.

Wettest in October

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Rongelap climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	81	81	81	82	82	83	83	83	83	83	83	82
Avg temp (°F)	81	80	81	81	82	82	82	82	83	83	83	82
Avg low (°F)	80	80	80	81	81	82	82	82	82	82	82	81
Precipitation (in)	1.2	0.9	1.7	2.4	2.8	2.8	4.3	5.4	6.2	6.5	5.1	1.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	81	81	81	82	82	83
Avg temp (°F)	81	80	81	81	82	82
Avg low (°F)	80	80	80	81	81	82
Precipitation (in)	1.2	0.9	1.7	2.4	2.8	2.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	83	83	83	83	83	82
Avg temp (°F)	82	82	83	83	83	82
Avg low (°F)	82	82	82	82	82	81
Precipitation (in)	4.3	5.4	6.2	6.5	5.1	1.9

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	57	56	54	57	59	60	65	69	71	73	64	53
Relative humidity (%)	77	77	78	79	80	81	82	82	82	82	81	78
Wind speed (mph)	15.7	15.7	15.6	15.4	14.2	13.6	12.1	10.2	9.8	10.8	13.7	16.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	57	56	54	57	59	60
Relative humidity (%)	77	77	78	79	80	81
Wind speed (mph)	15.7	15.7	15.6	15.4	14.2	13.6

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	65	69	71	73	64	53
Relative humidity (%)	82	82	82	82	81	78
Wind speed (mph)	12.1	10.2	9.8	10.8	13.7	16.2

Methodology & sources

Temperature & precipitation — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →