GreenlyLast and first frost dates in Hermosillo
Mexico
Hermosillo 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 Hermosillo
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 January |
| 10 °C | already in the first week of January |
| 15 °C | already in the first week of January |
| 18 °C | 19 January |
Frost dates near Hermosillo
Of the nearest cities on our list, the last spring frost ends earliest in Phoenix (4 February) and latest in Chihuahua (8 February).
| City | Distance | Last spring frost | First autumn frost |
|---|---|---|---|
| Ciudad Obregón | 202 km | — | — |
| Tucson | 350 km | 6 February | 18 December |
| Los Mochis | 413 km | — | — |
| Chihuahua | 479 km | 8 February | 8 December |
| Phoenix | 498 km | 4 February | 29 December |
Hermosillo: weather for the next 7 days
Forecast by Open-Meteo. Nights at or below 0 °C are marked as frost.
Weather in Hermosillo by month
Average weather in Hermosillo over 2016–2025: the warmest month is June. Months that average 20 °C or more by day: January–December (23.6–39.4 °C). Months that average 30 °C or more by day: April–October (32.6–39.4 °C). No month averages below 0 °C at night; the coldest nights, in January, average 9.3 °C. About 249 mm of rain falls in a year, on 34 days; September is the wettest month (62 mm) and April the driest (0 mm).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days |
|---|---|---|---|---|
| January | 23.6 | 9.3 | 11 | 2 |
| February | 26 | 10.8 | 11 | 2 |
| March | 28.7 | 12.9 | 12 | 1 |
| April | 32.6 | 16.1 | 0 | 0 |
| May | 34.9 | 18.7 | 0 | 0 |
| June | 39.4 | 24.3 | 7 | 2 |
| July | 39 | 27.3 | 38 | 7 |
| August | 38.4 | 27.1 | 60 | 9 |
| September | 36.6 | 24.9 | 62 | 7 |
| October | 34.4 | 20.5 | 21 | 1 |
| November | 29 | 14.7 | 14 | 1 |
| December | 24.6 | 11 | 13 | 2 |
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).
