Last updated: January 18, 2025
Arno Atoll, nestled in the Marshall Islands, exhibits a distinct Tropical Rainforest climate (Af) as classified by the Köppen-Geiger system. Throughout the year, temperatures remain warm and inviting, with a minimum of 25°C (77°F) reached in April, an average of 27°C (81°F) highlighting the region's tropical allure, and a peak of 30°C (85°F) recorded in September. This climatic stability contributes not only to the vibrant ecosystems found in the atoll but also to its appeal as a destination for those seeking the warmth and beauty characteristic of tropical environments.
The temperature patterns in Arno Atoll, Marshall Islands, showcase remarkable consistency throughout the year, characterized by mild and stable conditions. Monthly minimum temperatures hover around 25°C (78°F), emphasizing the atoll's tropical warmth. The average temperature remains steady at 27°C (81°F), while maximum temperatures typically range from 29°C (84°F) to 30°C (85°F). Notably, September marks a slight increase in maximum temperatures, reaching 30°C (85°F), indicating a peak during the latter part of the year. Overall, the climate exemplifies a persistent warm environment, with minimal fluctuation between months, creating a reliable and inviting atmosphere for residents and visitors alike.
In Arno, the temperatures range from a minimum of 25°C (77°F) in April to a maximum of 30°C (85°F) in September, showcasing a warm climate throughout the year. For more details on monthly temperatures, visit monthly temperatures in Arno.
Precipitation patterns in Arno Atoll reveal a pronounced wet season that significantly influences the atoll's tropical landscape. The rainfall peaks in May, with an impressive 416 mm (16.4 in) recorded, followed closely by December at 414 mm (16.3 in). Throughout the first half of the year, the atoll experiences considerable moisture, with March also noting high levels at 287 mm (11.3 in). This seasonality is accompanied by frequent rainfall days, particularly in May, where precipitation occurs on 29 days, providing essential hydration for the lush ecosystems that thrive in this warm climate.
While the wetter months dominate, Arno Atoll also experiences drier periods, notably in February with 157 mm (6.2 in), suggesting a more moderate climate during that month. However, rainfall remains a regular occurrence throughout the year, with most months experiencing precipitation on at least 19 to 29 days. The consistent moisture accumulation ensures that the region maintains its vibrant vegetation and rich biodiversity, underscoring the crucial role of precipitation in sustaining life on the atoll.
In Arno Atoll, sunshine duration exhibits a clear seasonal trend, reflecting the tropical climate's characteristics. The year begins with 222 hours of sunshine in January, gradually increasing as the months progress. February shows a notable jump to 264 hours, while March reaches a peak of 291 hours, marking it as one of the sunniest months of the year. As the atoll transitions into the warmer months, the sunshine hours continue to rise, peaking again in August with 299 hours, signaling the height of the dry season. This trend highlights a steady accumulation of sunlight during the latter half of the year, fueling both underwater and terrestrial ecosystems.
Conversely, the periods following this peak experience a slight decline in sunshine hours, particularly noticeable in November, which dips to 251 hours, reflecting increased cloud cover and the onset of the wet season. Thus, although December sees a rebound with 265 hours, the transition into the wetter months entails more unpredictable weather patterns. Overall, the sunshine duration in Arno Atoll illustrates a dynamic interplay between seasons, providing ample sunlight during the dry months while ensuring that the lush environment benefits from the seasonal variability.
The UV Index in Arno Atoll presents a striking narrative of extreme sunlight exposure throughout the year, underscoring the need for sun protection in this tropical paradise. Beginning in January with a UV Index of 13, the values steadily rise to a high of 16 in both March and April, indicating extreme exposure levels that necessitate vigilance. With a consistent burn time of just 10 minutes during these peak months, residents and visitors alike should prioritize sun safety measures, such as wearing protective clothing and applying high-SPF sunscreen, to mitigate the risks of harmful UV radiation.
As the year progresses, the UV Index maintains high levels, dropping slightly to 12 in November and 11 in December, yet still residing in the extreme category. Notably, the summer months, including June and July, register a UV Index of 13—a reminder that even during the wetter season, sun exposure can pose significant health risks. Overall, the persistent extreme UV Index in Arno Atoll highlights the importance of awareness and preparation for sun exposure, making it essential for everyone in the region to adopt protective strategies year-round to ensure safety while enjoying the island's stunning environment.
UV Risk Categories
Daylight duration in Arno Atoll exhibits a consistent pattern, reflecting the region's tropical location near the equator. In the early months of the year, January and February each offer approximately 11 hours of daylight, providing ample light for both daily activities and the vibrant ecosystems that thrive in this setting. As the year progresses into March, daylight increases to 12 hours, a trend that continues uninterrupted through June. This stable duration of daylight supports the region's rich biodiversity and enhances opportunities for outdoor exploration.
As the second half of the year unfolds, daylight remains predominantly at 12 hours from July to September, allowing for a continuous cycle of light that nourishes both terrestrial and marine environments. However, daylight begins to taper off in October, reducing back to 11 hours by the year's end in November and December. This gradual decrease in daylight duration does not drastically affect the tropical climate but instead marks the transition toward the wetter months, reinforcing the idea that Arno Atoll enjoys a reliable and balanced pattern of sunlight throughout the year.
The climate in Arno, Marshall Islands is characterized by consistently warm temperatures throughout the year, with average values around 27°C (81°F) and maximums typically reaching 29°C (84°F). January to December sees significantly variable precipitation, with May and December experiencing the highest rainfall at approximately 416 mm (16.4 in) and 414 mm (16.3 in) respectively. The region enjoys a substantial amount of sunshine, peaking in July and August with nearly 300 hours of sunlight each month. Despite the heavy rainfall, the warm temperatures and sunny conditions contribute to a tropical atmosphere. For more details, visit Arno climate.
In conclusion, Arno Atoll’s climate is characterized by its warm temperatures, high precipitation, ample sunshine, and extreme UV Index, creating a unique tropical environment year-round. With consistent daylight duration and seasonal variations in rainfall and sunshine, the atoll thrives as a lush habitat for diverse ecosystems. The persistent high UV Index underscores the importance of sun safety for residents and visitors alike, while the predictable rainfall patterns ensure the vitality of the region’s flora and fauna. Overall, understanding these climatic patterns not only enhances appreciation for the natural beauty of Arno Atoll but also informs sustainable practices to protect its remarkable ecosystems.