GreenlyLast and first frost dates in Porto Velho
Brazil
Porto Velho 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 Porto Velho
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 Porto Velho
| City | Distance | Last spring frost | First autumn frost |
|---|---|---|---|
| Riberalta | 345 km | — | — |
| Rio Branco | 450 km | — | — |
| Cobija | 588 km | — | — |
| Trinidad | 684 km | — | — |
| Manaus | 760 km | — | — |
Porto Velho: weather for the next 7 days
Forecast by Open-Meteo. Nights at or below 0 °C are marked as frost.
Weather in Porto Velho by month
Average weather in Porto Velho over 2016–2025: the warmest month is September. Months that average 20 °C or more by day: January–December (29.6–33.8 °C). Months that average 30 °C or more by day: May–January (30–33.8 °C). No month averages below 0 °C at night; the coldest nights, in July, average 21.6 °C. About 2189 mm of rain falls in a year, on 224 days; January is the wettest month (331 mm) and July the driest (5 mm).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days |
|---|---|---|---|---|
| January | 30.1 | 23.3 | 331 | 28 |
| February | 29.7 | 23.3 | 317 | 26 |
| March | 29.6 | 23.4 | 321 | 29 |
| April | 29.8 | 23.4 | 243 | 27 |
| May | 30 | 23 | 123 | 18 |
| June | 30.7 | 22.1 | 35 | 6 |
| July | 32.9 | 21.6 | 5 | 1 |
| August | 33.6 | 22.6 | 39 | 6 |
| September | 33.8 | 23.7 | 80 | 13 |
| October | 32.8 | 23.9 | 137 | 19 |
| November | 31.4 | 23.7 | 244 | 23 |
| December | 30.2 | 23.4 | 314 | 28 |
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).
