Climate and monthly weather forecastRoto, Cook Islands
Climate and monthly weather forecast
The climate of Roto
Bearing the Köppen climate classification Af, Roto is marked by a tropical rainforest climate. This designation is indicative of heavy rainfall throughout the year and no dry season. As part of the Cook Islands, Roto sits in the South Pacific Ocean.The prevailing climate presents a rather stable pattern of warm temperatures, with monthly averages staying between 27.3°C (81.1°F) to 28.3°C (82.9°F). In tune with this, Roto's climate proves humid, with relative humidity figures revolving around 75% to 77% on average. This snapshot of humidity underscores a constant level of moisture, characteristic of Roto's tropical rainforest climate.
Rainfall in Roto is a constant theme, though the volume of downpour sees fluctuations across the year. From the months of January to December, rainfall accumulates from 78mm (3.07") to 268mm (10.55"). An investigation of this variable exhibits a fall season, particularly in September, that experiences the lowest rainfall of 78mm (3.07").
An examination of Roto's wind speed gives an understanding of its windy days. Wind speeds vary from 17.4km/h (10.8mph) to 26km/h (16.2mph), suggesting the island experiences a mild to moderate breeze throughout the year. The highest wind speeds occur in July and August.
The best time to visit Roto
Despite the tropical rainforest climate, a preferable time to visit Roto is in the second half of the year. Months from July to October are particularly noteworthy, given an observable decrease in rainfall levels. The rainfall drops significantly to a low of 78mm (3.07") in September, aiding in more comfortable sightseeing conditions.Additionally, this time of year also sees a reduction in cloud cover, increasing the amount of daily sunshine from 7.8 hours in July and August to a peak of 8.5 hours in September. The average UV Index remains constant throughout the year at 7, suggesting a need for sun protection year-round, but the increase in sunlight hours during the late summer to early autumn months may offer more opportunities for outdoor activities.
The worst time to visit Roto
The most challenging time for a visit to Roto falls in the early part of the year. Precipitation is at its maximum in these months, reaching a peak of 268mm (10.55") in January. Along with this, humidity is also at a high level, causing discomfort to visitors not accustomed to such conditions.Additionally, less daily sunshine, from 7.6 hours in January to 8.1 hours in April, coupled with increasing rainfall, may prove to be restrictive for outdoor activities and sightseeing.
Spring weather in Roto
Spring in Roto, taking place between September to November, is a period of relatively lower rainfall and more sunshine. Rainfall ranges from 78mm (3.07") to 159mm (6.26"), thus providing more opportunities for outdoor exploration. Daylight hours increase gradually from 12.1 hours to 12.6 hours, while sunshine hours are between 8.0 hours to 8.5 hours, making spring a desirable season for visitors.Summer weather in Roto
Summers in Roto, spanning from December to February, are characterized by high rainfall, with precipitation ranging from 242mm (9.53") to 268mm (10.55"). Temperatures remain constantly warm, with averages varying slightly from 27.8°C (82°F) to 28.8°C (83.8°F). Despite the high level of rainfall, the amount of daily sunshine remains relatively constant, around 7.6 hours to 7.8 hours.Autumn weather in Roto
During the autumn months of March through May, Roto experiences decreased rainfall, with levels falling from 188mm (7.4") to 130mm (5.12"). Temperatures maintain an average range, from 28°C (82.4°F) to 29°C (84.2°F). Daily sunshine sees a steady increment, from 7.9 hours in March to 8.4 hours in May.Winter weather in Roto
Winter weather in Roto, from June to August, is characterized by moderate rainfall levels from 122mm (4.8") to 133mm (5.24"). The temperatures hover from a low of 27.3°C (81.1°F) to a high of 28.8°C (83.8°F). Sunshine hours are relatively constant, with an average of around 8.1 hours in June and an equal amount in August. The number of daylight hours is also relatively constant, with around 11.5 to 11.8 hours.Weather in January
January's weather in Roto, Cook Islands, is characterized by a strong tropical atmosphere. Although the island begins the year with this typical climate, it displays a slightly lower relative humidity of 75%, giving the air a touch cooler feeling than the following months. Weather in January »Weather in February
February brings a slightly modified climate pattern to Roto. The relative humidity shows a minor increase, reaching 76%. Rainfall declines to 242mm (9.53"), indicating the beginning of a gradual shift in weather patterns. Changes in temperature are minimal, maintaining an overall tropical feel synonymous with island locations. Weather in February »Weather in March
March is marked by a substantial turn in precipitation levels, with rainfall reducing by almost 54mm (2.13") from February to 188mm (7.4"). Climate characteristics remain more or less constant with February, demonstrating the region's consistent weather. Weather in March »Weather in April
April's climate in Roto, Cook Islands, continues the trend set in March, with a further decrease in rainfall down to 129mm (5.08"). Average visibility holds at 10km (6.2mi), allowing for clear views most of the time. Temperatures stay in the upper scale reflecting the prevailing tropical weather conditions. Weather in April »Weather in May
May ushers in a weather pattern in Roto almost similar to what is experienced in April. However, the number of daylight hours decreases, now standing at 11.6 hours. Sunshine duration sees an increase to 8.4 hours, representing the highest sunshine hours for the first half of the year. Weather in May »Weather in June
In June, Roto's temperature begins to slightly dip, with lows of 27.6°C (81.7°F), which is the lowest observed in the first half of the year. Relative humidity also experiences an increase, reaching a notable 77%. Despite the relative increase in humidity, rainfall remains low with a close resemblance to figures noticed in May. Weather in June »Weather in July
July is characterized by a minor decrease in average high temperatures to the lowest yearly value of 28.1°C (82.6°F). Notably, there is a peak in the wind speed, gusting at an explosive 35.8km/h (22.2mph), the highest for the year. Weather in July »Weather in August
August weather conditions in Roto, Cook Islands, resemble those of July with minimal deviations. The region experiences the least amount of rain for the year, with the volume dropping to 95mm (3.74"). Humidity remains at 77%, while temperatures continue with the cooler pattern initiated in July. Weather in August »Weather in September
September weather in Roto marks a change in wind and precipitation patterns. While the amount of rainfall increases slightly to 78mm (3.07"), wind gusts slightly decrease to 34.9km/h (21.7mph) from the previous high. September also boasts the highest daylight hours for the second half of the year, reaching 12.1 hours. Weather in September »Weather in October
October in Roto continues to display a constant tropical climate with distinct features comparable to those in the earlier part of the year. A notable occurrence in October is the increase in rainfall to 131mm (5.16"), presenting a moderate shift in precipitation patterns. Weather in October »Weather in November
November weather in Roto retains the consistency noted in October, with few significant changes. Rainfall increases once more to 159mm (6.26"), indicating the rainy season's onset. Temperatures, cloud cover, visibility, and wind patterns largely maintain the annual trends noticed throughout the Cook Islands. Weather in November »Weather in December
Roto's December climate transitions to a slightly warmer realm, with the high-temperature reaching an average of 28.9°C (84°F). However, the weather remains consistent with the previous months in almost all aspects. Rainfall increases once more to 193mm (7.6"), painting a clear picture of the rainy season's peak. Weather in December »Updated: Jan 26, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
The month with the most rainfall in Roto, Cook Islands, is January, when the rain falls for 27.2 days and typically aggregates up to 268mm (10.55") of precipitation.
Throughout the year, there are 301.2 rainfall days, and 1868mm (73.54") of precipitation is accumulated.
January has the least sunshine of the year in Roto, Cook Islands, with an average of 7.6h of sunshine.
January through December, with an average maximum UV index of 7, are months with the highest UV index.
January through December, with an average maximum UV index of 7, are months with the lowest UV index.
The peak of Roto's temperatures is noted during March through May, averaging a high-temperature of 29°C (84.2°F).
The months with the highest humidity in Roto, Cook Islands, are June through September, with an average relative humidity of 77%.
The month with the shortest days in Roto, Cook Islands, is June, with an average of 11h and 30min of daylight.
September is Roto's coldest month, registering average high temperatures of 27.8°C (82°F) and lows of 27.1°C (80.8°F).
The month with the least rainfall is September, when the rain falls for 21.6 days and typically collects 78mm (3.07") of precipitation.
September has the most sunshine of the year in Roto, with an average of 8.5h of sunshine.
The least humid month in Roto is December, with an average relative humidity of 74%.
December has the longest days of the year in Roto, with an average of 12h and 48min of daylight.
Roto, Cook Islands, does not observe Daylight Saving Time (DST). -10 timezone is used throughout the entire year.
Average temperature
Roto, Cook Islands
The warmest months (with the highest average high temperature) are March, April and May (29°C).
The month with the lowest average high temperature is September (27.8°C).
The month with the highest average low temperature is April (28.3°C).
The coldest month (with the lowest average low temperature) is August (27°C).
Average pressure
Roto, Cook Islands
- Average pressure in January:
1008.1mbar - Average pressure in February:
1008.4mbar - Average pressure in March:
1009.4mbar - Average pressure in April:
1010.1mbar - Average pressure in May:
1010.7mbar - Average pressure in June:
1010.9mbar
- Average pressure in July:
1010.9mbar - Average pressure in August:
1011.5mbar - Average pressure in September:
1011.5mbar - Average pressure in October:
1010.7mbar - Average pressure in November:
1009.5mbar - Average pressure in December:
1008.5mbar
The months with the highest atmospheric pressure are August and September (1011.5mbar).
The month with the lowest atmospheric pressure is January (1008.1mbar).
Average wind speed
Roto, Cook Islands
- Average wind speed in January:
20km/h - Average wind speed in February:
21.6km/h - Average wind speed in March:
18.1km/h - Average wind speed in April:
17.4km/h - Average wind speed in May:
19.6km/h - Average wind speed in June:
23.3km/h
- Average wind speed in July:
25.4km/h - Average wind speed in August:
26km/h - Average wind speed in September:
25km/h - Average wind speed in October:
20.4km/h - Average wind speed in November:
18.3km/h - Average wind speed in December:
18.7km/h
The windiest month (with the highest average wind speed) is August (26km/h).
The calmest month (with the lowest average wind speed) is April (17.4km/h).
Average humidity
Roto, Cook Islands
The months with the highest relative humidity are June, July, August and September (77%).
The month with the lowest relative humidity is December (74%).
Average rainfall
Roto, Cook Islands
- Average rainfall in January:
268mm - Average rainfall in February:
242mm - Average rainfall in March:
188mm - Average rainfall in April:
129mm - Average rainfall in May:
130mm - Average rainfall in June:
122mm
The wettest month (with the highest rainfall) is January (268mm).
The driest month (with the least rainfall) is September (78mm).
Average rainfall days
Roto, Cook Islands
- Average rainfall days in January:
27.2 days - Average rainfall days in February:
26.1 days - Average rainfall days in March:
28.7 days - Average rainfall days in April:
24.2 days - Average rainfall days in May:
24.8 days - Average rainfall days in June:
24.5 days
- Average rainfall days in July:
24.5 days - Average rainfall days in August:
23.3 days - Average rainfall days in September:
21.6 days - Average rainfall days in October:
24.9 days - Average rainfall days in November:
24.8 days - Average rainfall days in December:
26.6 days
The month with the highest number of rainy days is March (28.7 days).
The month with the least rainy days is September (21.6 days).
Average daylight / Average sunshine
Roto, Cook Islands
- Average daylight in January:
12h and 42min - Average daylight in February:
12h and 24min - Average daylight in March:
12h and 12min - Average daylight in April:
11h and 54min - Average daylight in May:
11h and 36min - Average daylight in June:
11h and 30min
- Average daylight in July:
11h and 36min - Average daylight in August:
11h and 48min - Average daylight in September:
12h and 6min - Average daylight in October:
12h and 24min - Average daylight in November:
12h and 36min - Average daylight in December:
12h and 48min
The month with the longest days is December (Average daylight: 12h and 48min).
The month with the shortest days is June (Average daylight: 11h and 30min).
- Average sunshine in January:
7h and 36min - Average sunshine in February:
7h and 48min - Average sunshine in March:
7h and 54min - Average sunshine in April:
8h and 6min - Average sunshine in May:
8h and 24min - Average sunshine in June:
8h and 6min
- Average sunshine in July:
8h and 0min - Average sunshine in August:
7h and 48min - Average sunshine in September:
8h and 30min - Average sunshine in October:
8h and 0min - Average sunshine in November:
8h and 12min - Average sunshine in December:
8h and 0min
The month with the most sunshine is September (Average sunshine: 8h and 30min).
The month with the least sunshine is January (Average sunshine: 7h and 36min).
Average sunshine days
Roto, Cook Islands
- Average sunshine days in January:
1.8 days - Average sunshine days in February:
0.4 days - Average sunshine days in March:
1.7 days - Average sunshine days in April:
3.3 days - Average sunshine days in May:
4.2 days - Average sunshine days in June:
2.8 days
- Average sunshine days in July:
3.7 days - Average sunshine days in August:
3.6 days - Average sunshine days in September:
5.6 days - Average sunshine days in October:
4.3 days - Average sunshine days in November:
4.1 days - Average sunshine days in December:
3 days
The month with the most sunshine days is September (5.6 days).
The month with the least sunshine days is February (0.4 days).
Average UV index
Roto, Cook Islands
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
Average cloud cover
Roto, Cook Islands
The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are May and September (Cloud cover 41).
Average visibility
Roto, Cook Islands
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January and February (9km).
