GreenlyLast and first frost dates in Rio Branco
Brazil
Rio Branco had no frost in 2016–2025, so crops are planted by warmth and rain rather than by frost dates.
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| Last spring frost | none in ten years |
|---|---|
| First autumn frost | none in ten years |
Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.
There is no frost season here: crops are planted by warmth and rain rather than by frost dates.
When the soil warms up in Rio Branco
The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo).
| Soil | Date |
|---|---|
| 5 °C | already in the first week of July |
| 10 °C | already in the first week of July |
| 15 °C | already in the first week of July |
| 18 °C | already in the first week of July |
Frost dates near Rio Branco
| City | Distance | Last spring frost | First autumn frost |
|---|---|---|---|
| Cobija | 156 km | — | — |
| Riberalta | 223 km | — | — |
| Porto Velho | 450 km | — | — |
| Cusco | 601 km | 3 August | 15 June |
| Trinidad | 626 km | — | — |
Rio Branco: weather for the next 7 days
Forecast by Open-Meteo. Nights at or below 0 °C are marked as frost.
Weather in Rio Branco by month
Average weather in Rio Branco over 2016–2025: the warmest month is September. Months that average 20 °C or more by day: January–December (29.4–33.6 °C). Months that average 30 °C or more by day: July–December (30–33.6 °C). No month averages below 0 °C at night; the coldest nights, in July, average 19.7 °C. About 1796 mm of rain falls in a year, on 202 days; December is the wettest month (292 mm) and July the driest (15 mm).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days |
|---|---|---|---|---|
| January | 29.9 | 22.9 | 248 | 25 |
| February | 29.6 | 22.9 | 248 | 25 |
| March | 29.8 | 22.8 | 266 | 26 |
| April | 29.7 | 22.5 | 162 | 23 |
| May | 29.4 | 21.5 | 95 | 14 |
| June | 29.6 | 20.2 | 50 | 6 |
| July | 31.5 | 19.7 | 15 | 3 |
| August | 32.6 | 20.9 | 37 | 6 |
| September | 33.6 | 22.7 | 66 | 10 |
| October | 32.5 | 23 | 120 | 16 |
| November | 31.2 | 22.9 | 197 | 22 |
| December | 30 | 22.9 | 292 | 26 |
Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).
