Climate Change Chart of Rarotonga, Cook Islands
Comprehensive Climate Change Chart of Rarotonga, Cook Islands: Monthly Averages and Impact Trends
For Rarotonga, Cook Islands, the climate data compare 1940–1950 with 2013–2023.
Averaged across calendar months, monthly mean temperature shows a difference/change of +0.60 °C compared with the earlier reference period. This is an unweighted mean of the monthly means, not a day-weighted annual average, and describes the overall monthly-average comparison rather than a change in every month.
Overview of climate changes
Temperature changes
Averaged across calendar months, monthly mean temperature shows a difference/change of +0.60 °C compared with the earlier reference period. This is an unweighted mean of the monthly means, not a day-weighted annual average, and describes the overall monthly-average comparison rather than a change in every month. The largest monthly increase was in June, with a difference/change of +0.90 °C. This identifies the strongest increase in the supplied monthly comparisons; it does not imply that all months warmed by the same amount, and monthly means are not daytime maximum temperatures.
Changes in rainfall
Mean daily rainfall averaged across calendar months had a difference/change of -0.21 mm/day. This unweighted mean of the monthly means summarizes the comparison without implying the same decrease in every month; these are daily averages, not monthly rainfall totals. The largest monthly increase in mean daily rainfall occurred in May, at a difference/change of +1.22 mm/day. By contrast, November had the largest monthly decrease, with a difference/change of -2.41 mm/day. These contrasting monthly results show why the mean decrease should not be read as a uniform change through the year.
Changes in sunshine duration
Mean daily sunshine duration, averaged across calendar months, had a difference/change of -0.15 hours/day. This is an unweighted average of monthly mean differences, not a day-weighted annual figure, and does not mean that sunshine decreased in every month. The largest monthly increase in mean daily sunshine was in September, with a difference/change of +0.41 hours/day. The largest monthly decrease was in December, at a difference/change of -0.39 hours/day; both are daily-hour averages, not a measure of total sunshine over each month.
Climate Change Data Overview for Rarotonga, Cook Islands
Explore the comprehensive climate change data for Rarotonga, Cook Islands. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes influenced by climate change, helping you understand the unique weather patterns of this region.
Temperature °C
| Month | ⌀ 1940 - 1950 | ⌀ 2013 - 2023 | +/- |
|---|---|---|---|
| Jan | 22.88 | 23.52 | 0.64 |
| Feb | 23.19 | 23.83 | 0.64 |
| Mar | 23.13 | 24.01 | 0.88 |
| Apr | 22.65 | 23.33 | 0.68 |
| May | 21.74 | 22.47 | 0.73 |
| Jun | 20.58 | 21.48 | 0.90 |
| Jul | 19.84 | 20.69 | 0.86 |
| Aug | 19.92 | 20.24 | 0.32 |
| Sep | 20.14 | 20.54 | 0.40 |
| Oct | 20.48 | 20.85 | 0.37 |
| Nov | 21.48 | 21.69 | 0.21 |
| Dec | 22.19 | 22.75 | 0.56 |
| ⌀ Month | 21.52 | 22.12 | 0.60 |
Sunshine (h) / day
| Month | ⌀ 1940 - 1950 | ⌀ 2013 - 2023 | +/- |
|---|---|---|---|
| Jan | 10.62 | 10.25 | -0.37 |
| Feb | 10.49 | 10.16 | -0.33 |
| Mar | 10.10 | 9.73 | -0.38 |
| Apr | 9.67 | 9.35 | -0.32 |
| May | 9.00 | 8.69 | -0.31 |
| Jun | 8.68 | 8.67 | -0.01 |
| Jul | 8.43 | 8.47 | 0.04 |
| Aug | 9.22 | 8.92 | -0.30 |
| Sep | 9.46 | 9.87 | 0.41 |
| Oct | 9.87 | 9.93 | 0.06 |
| Nov | 10.45 | 10.49 | 0.04 |
| Dec | 10.61 | 10.22 | -0.39 |
| ⌀ Month | 9.72 | 9.56 | -0.15 |
Rain (mm) / day
| Month | ⌀ 1940 - 1950 | ⌀ 2013 - 2023 | +/- |
|---|---|---|---|
| Jan | 7.27 | 7.88 | 0.61 |
| Feb | 6.46 | 6.47 | 0.01 |
| Mar | 6.53 | 7.66 | 1.13 |
| Apr | 4.16 | 4.69 | 0.53 |
| May | 3.78 | 5.00 | 1.22 |
| Jun | 2.98 | 2.77 | -0.21 |
| Jul | 3.35 | 3.35 | 0.00 |
| Aug | 3.07 | 2.85 | -0.21 |
| Sep | 3.57 | 2.36 | -1.21 |
| Oct | 4.54 | 3.02 | -1.51 |
| Nov | 5.36 | 2.96 | -2.41 |
| Dec | 6.24 | 5.75 | -0.50 |
| ⌀ Month | 4.77 | 4.56 | -0.21 |
Snow (mm) / day
| Month | ⌀ 1940 - 1950 | ⌀ 2013 - 2023 | +/- |
|---|---|---|---|
| Jan | 0.00 | 0.00 | 0.00 |
| Feb | 0.00 | 0.00 | 0.00 |
| Mar | 0.00 | 0.00 | 0.00 |
| Apr | 0.00 | 0.00 | 0.00 |
| May | 0.00 | 0.00 | 0.00 |
| Jun | 0.00 | 0.00 | 0.00 |
| Jul | 0.00 | 0.00 | 0.00 |
| Aug | 0.00 | 0.00 | 0.00 |
| Sep | 0.00 | 0.00 | 0.00 |
| Oct | 0.00 | 0.00 | 0.00 |
| Nov | 0.00 | 0.00 | 0.00 |
| Dec | 0.00 | 0.00 | 0.00 |
| ⌀ Month | 0.00 | 0.00 | 0.00 |
