Castanhal weather in December
In December, Castanhal sees average daytime highs of 33°C and overnight lows near 24°C, with 118 mm of rain across 17.4 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.
Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 9% of the time in December, and the air most often feels oppressive.
Daylight stretches from about 12 h 06 min at the start of December to 12 h 06 min by month's end. Set against the rest of the year, December is Castanhal's 7th-clearest and 4th-windiest month. For the whole year in context, see Castanhal's year-round climate.
- Daytime high
- 33°
- 4th warmest
- Overnight low
- 24°
- 12th coldest
- Rainfall
- 118 mm
- 17.4 wet days
- Daylight
- 12 h 06 min
- 6:06 AM – 6:10 PM
- Cloud cover
- 70%
- 7th clearest
- Wind
- 9 km/h
- 4th windiest
- Solar energy
- 5.23 kWh/m²
- Travel score
- 3.0
- out of 10
Castanhal is human settlement in Brazil.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Day-to-day highs hold fairly steady near 33°C through the month.
A typical December day in Castanhal reaches about 33°C in the afternoon and slips back to 24°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 34°C. Set against its neighbours, December runs about 1°C cooler than November and about 2°C warmer than January.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
| Avg low (°C) | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 33 | 24 |
| 2 | 33 | 24 |
| 3 | 33 | 24 |
| 4 | 33 | 24 |
| 5 | 33 | 24 |
| 6 | 33 | 24 |
| 7 | 33 | 24 |
| 8 | 33 | 24 |
| 9 | 33 | 24 |
| 10 | 33 | 24 |
| 11 | 33 | 24 |
| 12 | 33 | 24 |
| 13 | 33 | 24 |
| 14 | 33 | 24 |
| 15 | 33 | 24 |
| 16 | 33 | 24 |
| 17 | 33 | 24 |
| 18 | 33 | 24 |
| 19 | 33 | 24 |
| 20 | 32 | 24 |
| 21 | 32 | 24 |
| 22 | 32 | 24 |
| 23 | 32 | 24 |
| 24 | 32 | 24 |
| 25 | 32 | 24 |
| 26 | 32 | 24 |
| 27 | 32 | 24 |
| 28 | 32 | 24 |
| 29 | 32 | 24 |
| 30 | 32 | 24 |
| 31 | 32 | 24 |
How December really feels in Castanhal
Once humidity and wind are folded in, December averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Castanhal weather by month
How December compares with the rest of the year at a glance. December is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 31° / 23° | 269 | 27.1 | 12.1 | 2.6 |
| Feb | 30° / 23° | 354 | 26.9 | 12 | 2.5 |
| Mar | 30° / 23° | 456 | 30.5 | 12 | 2.5 |
| Apr | 30° / 23° | 427 | 29.6 | 12 | 2.5 |
| May | 31° / 23° | 278 | 27.7 | 11.9 | 2.7 |
| Jun | 31° / 23° | 120 | 21.4 | 11.9 | 3.1 |
| Jul | 32° / 22° | 91 | 18.1 | 11.9 | 3.5 |
| Aug | 32° / 23° | 51 | 13 | 12 | 3.6 |
| Sep | 33° / 23° | 34 | 8.8 | 12 | 3.6 |
| Oct | 34° / 23° | 34 | 8.1 | 12 | 3.4 |
| Nov | 33° / 24° | 49 | 8.8 | 12.1 | 3.3 |
| Dec | 33° / 24° | 118 | 17.4 | 12.1 | 3.0 |
Cloud cover in December
The sky is clear or mostly clear about 9% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 23% of December, with mostly cloudy or overcast conditions the remaining 68%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 44 | 43 | 43 | 42 | 41 | 41 | 40 | 39 | 39 | 38 | 36 | 36 | 34 | 34 | 32 | 32 | 30 | 29 | 29 | 27 | 27 | 25 | 25 | 25 | 23 | 23 | 23 | 23 | 23 | 22 | 21 |
| Cloudier (%) | 56 | 57 | 57 | 58 | 59 | 59 | 60 | 61 | 61 | 62 | 64 | 64 | 66 | 66 | 68 | 68 | 70 | 71 | 71 | 73 | 73 | 75 | 75 | 75 | 77 | 77 | 77 | 77 | 77 | 78 | 79 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 44 | 56 |
| 2 | 43 | 57 |
| 3 | 43 | 57 |
| 4 | 42 | 58 |
| 5 | 41 | 59 |
| 6 | 41 | 59 |
| 7 | 40 | 60 |
| 8 | 39 | 61 |
| 9 | 39 | 61 |
| 10 | 38 | 62 |
| 11 | 36 | 64 |
| 12 | 36 | 64 |
| 13 | 34 | 66 |
| 14 | 34 | 66 |
| 15 | 32 | 68 |
| 16 | 32 | 68 |
| 17 | 30 | 70 |
| 18 | 29 | 71 |
| 19 | 29 | 71 |
| 20 | 27 | 73 |
| 21 | 27 | 73 |
| 22 | 25 | 75 |
| 23 | 25 | 75 |
| 24 | 25 | 75 |
| 25 | 23 | 77 |
| 26 | 23 | 77 |
| 27 | 23 | 77 |
| 28 | 23 | 77 |
| 29 | 23 | 77 |
| 30 | 22 | 78 |
| 31 | 21 | 79 |
Chance of precipitation in December
Castanhal gets around 118 mm of rain over 17.4 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 56% and peaks near 77% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 34 | 35 | 36 | 38 | 39 | 40 | 42 | 44 | 46 | 48 | 49 | 51 | 53 | 54 | 56 | 57 | 59 | 60 | 62 | 63 | 64 | 66 | 67 | 68 | 70 | 71 | 72 | 73 | 75 | 76 | 77 |
| Rain chance (%) | |
|---|---|
| 1 | 34 |
| 2 | 35 |
| 3 | 36 |
| 4 | 38 |
| 5 | 39 |
| 6 | 40 |
| 7 | 42 |
| 8 | 44 |
| 9 | 46 |
| 10 | 48 |
| 11 | 49 |
| 12 | 51 |
| 13 | 53 |
| 14 | 54 |
| 15 | 56 |
| 16 | 57 |
| 17 | 59 |
| 18 | 60 |
| 19 | 62 |
| 20 | 63 |
| 21 | 64 |
| 22 | 66 |
| 23 | 67 |
| 24 | 68 |
| 25 | 70 |
| 26 | 71 |
| 27 | 72 |
| 28 | 73 |
| 29 | 75 |
| 30 | 76 |
| 31 | 77 |
Humidity in December
Most of December feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the oppressive band about 93% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Muggy (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Oppressive (%) | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 96 | 96 | 96 | 96 | 96 | 96 | 95 | 95 | 95 | 95 | 94 | 94 | 93 | 93 | 92 | 92 | 91 | 90 | 89 | 88 | 87 | 86 | 85 | 85 |
| Miserable (%) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 15 |
| Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|
| 1 | 1 | 95 | 4 |
| 2 | 1 | 95 | 4 |
| 3 | 1 | 95 | 4 |
| 4 | 1 | 95 | 4 |
| 5 | 1 | 95 | 4 |
| 6 | 1 | 95 | 4 |
| 7 | 1 | 95 | 4 |
| 8 | 0 | 96 | 4 |
| 9 | 0 | 96 | 4 |
| 10 | 0 | 96 | 4 |
| 11 | 0 | 96 | 4 |
| 12 | 0 | 96 | 4 |
| 13 | 0 | 96 | 4 |
| 14 | 0 | 95 | 5 |
| 15 | 0 | 95 | 5 |
| 16 | 0 | 95 | 5 |
| 17 | 0 | 95 | 5 |
| 18 | 0 | 94 | 6 |
| 19 | 0 | 94 | 6 |
| 20 | 0 | 93 | 7 |
| 21 | 0 | 93 | 7 |
| 22 | 0 | 92 | 8 |
| 23 | 0 | 92 | 8 |
| 24 | 0 | 91 | 9 |
| 25 | 0 | 90 | 10 |
| 26 | 0 | 89 | 11 |
| 27 | 0 | 88 | 12 |
| 28 | 0 | 87 | 13 |
| 29 | 0 | 86 | 14 |
| 30 | 0 | 85 | 15 |
| 31 | 0 | 85 | 15 |
Wind in December
Winds average 9 km/h in December.
Across December, daily wind ranges from about 8 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 10 | calm |
| 2 | 10 | calm |
| 3 | 10 | calm |
| 4 | 10 | calm |
| 5 | 10 | calm |
| 6 | 10 | calm |
| 7 | 10 | calm |
| 8 | 10 | calm |
| 9 | 10 | calm |
| 10 | 10 | calm |
| 11 | 9 | calm |
| 12 | 9 | calm |
| 13 | 9 | calm |
| 14 | 9 | calm |
| 15 | 9 | calm |
| 16 | 9 | calm |
| 17 | 9 | calm |
| 18 | 9 | calm |
| 19 | 9 | calm |
| 20 | 9 | calm |
| 21 | 9 | calm |
| 22 | 9 | calm |
| 23 | 9 | calm |
| 24 | 9 | calm |
| 25 | 9 | calm |
| 26 | 9 | calm |
| 27 | 9 | calm |
| 28 | 9 | calm |
| 29 | 8 | calm |
| 30 | 8 | calm |
| 31 | 8 | calm |
Sunrise & sunset in December
Daylight runs from about 12 h 06 min at the start of December to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 0 minutes over December. Sunrise moves from 5:59 AM to 6:13 AM, and sunset from 6:04 PM to 6:17 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 |
| Sunrise (AM) | 5:59 | 6:00 | 6:00 | 6:01 | 6:01 | 6:01 | 6:02 | 6:02 | 6:03 | 6:03 | 6:03 | 6:04 | 6:04 | 6:05 | 6:05 | 6:06 | 6:06 | 6:07 | 6:07 | 6:07 | 6:08 | 6:08 | 6:09 | 6:09 | 6:10 | 6:10 | 6:11 | 6:11 | 6:12 | 6:12 | 6:13 |
| Sunset (PM) | 6:04 | 6:04 | 6:04 | 6:05 | 6:05 | 6:06 | 6:06 | 6:06 | 6:07 | 6:07 | 6:08 | 6:08 | 6:09 | 6:09 | 6:10 | 6:10 | 6:11 | 6:11 | 6:12 | 6:12 | 6:12 | 6:13 | 6:13 | 6:14 | 6:14 | 6:15 | 6:15 | 6:16 | 6:16 | 6:17 | 6:17 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.1 | 5:59 | 6:04 |
| 2 | 12.1 | 6:00 | 6:04 |
| 3 | 12.1 | 6:00 | 6:04 |
| 4 | 12.1 | 6:01 | 6:05 |
| 5 | 12.1 | 6:01 | 6:05 |
| 6 | 12.1 | 6:01 | 6:06 |
| 7 | 12.1 | 6:02 | 6:06 |
| 8 | 12.1 | 6:02 | 6:06 |
| 9 | 12.1 | 6:03 | 6:07 |
| 10 | 12.1 | 6:03 | 6:07 |
| 11 | 12.1 | 6:03 | 6:08 |
| 12 | 12.1 | 6:04 | 6:08 |
| 13 | 12.1 | 6:04 | 6:09 |
| 14 | 12.1 | 6:05 | 6:09 |
| 15 | 12.1 | 6:05 | 6:10 |
| 16 | 12.1 | 6:06 | 6:10 |
| 17 | 12.1 | 6:06 | 6:11 |
| 18 | 12.1 | 6:07 | 6:11 |
| 19 | 12.1 | 6:07 | 6:12 |
| 20 | 12.1 | 6:07 | 6:12 |
| 21 | 12.1 | 6:08 | 6:12 |
| 22 | 12.1 | 6:08 | 6:13 |
| 23 | 12.1 | 6:09 | 6:13 |
| 24 | 12.1 | 6:09 | 6:14 |
| 25 | 12.1 | 6:10 | 6:14 |
| 26 | 12.1 | 6:10 | 6:15 |
| 27 | 12.1 | 6:11 | 6:15 |
| 28 | 12.1 | 6:11 | 6:16 |
| 29 | 12.1 | 6:12 | 6:16 |
| 30 | 12.1 | 6:12 | 6:17 |
| 31 | 12.1 | 6:13 | 6:17 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 5.23 kWh/m².
For context, solar energy here swings from a low near 4.05 kWh/m² to a high of 6.13 kWh/m² in October across the year — December's 5.23 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.6 | 5.6 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.4 | 5.4 | 5.4 | 5.3 | 5.3 | 5.3 | 5.3 | 5.2 | 5.2 | 5.2 | 5.2 | 5.1 | 5.1 | 5.1 | 5.0 | 5.0 | 5.0 | 5.0 | 4.9 | 4.9 | 4.9 | 4.9 | 4.8 | 4.8 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.6 | Bright |
| 2 | 5.6 | Bright |
| 3 | 5.5 | Bright |
| 4 | 5.5 | Bright |
| 5 | 5.5 | Bright |
| 6 | 5.5 | Bright |
| 7 | 5.5 | Bright |
| 8 | 5.4 | Bright |
| 9 | 5.4 | Bright |
| 10 | 5.4 | Bright |
| 11 | 5.3 | Bright |
| 12 | 5.3 | Bright |
| 13 | 5.3 | Bright |
| 14 | 5.3 | Bright |
| 15 | 5.2 | Bright |
| 16 | 5.2 | Bright |
| 17 | 5.2 | Bright |
| 18 | 5.2 | Bright |
| 19 | 5.1 | Bright |
| 20 | 5.1 | Bright |
| 21 | 5.1 | Bright |
| 22 | 5.0 | Bright |
| 23 | 5.0 | Bright |
| 24 | 5.0 | Bright |
| 25 | 5.0 | Bright |
| 26 | 4.9 | Bright |
| 27 | 4.9 | Bright |
| 28 | 4.9 | Bright |
| 29 | 4.9 | Bright |
| 30 | 4.8 | Bright |
| 31 | 4.8 | Bright |
Hazard calendar for Castanhal
None of Castanhal's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Castanhal's monsoon runs January–May, when most of the year's rain falls.
Is December a good time to visit Castanhal?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a weaker month for outdoor sightseeing in Castanhal.
What to pack for Castanhal in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Castanhal sees daytime highs around 33°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 17 days see rain.
Sea temperature near Castanhal in December
The nearest coast averages about 29°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 53 km away) is warmest in June at about 29°C and coldest in March near 28°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 29 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 28 | Tropical |
| Mar | 28 | Tropical |
| Apr | 29 | Tropical |
| May | 29 | Tropical |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 29 | Tropical |
UV index in Castanhal in December
Clear-sky midday UV in December peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Castanhal peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 18 at about 10 (extreme).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 13 | 14 | 15 | 14 | 12 | 11 | 10 | 10 | 12 | 12 | 10 | 11 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 14 | Extreme |
| Mar | 15 | Extreme |
| Apr | 14 | Extreme |
| May | 12 | Extreme |
| Jun | 11 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 10 | Extreme |
| Dec | 11 | Extreme |
Air quality in Castanhal in December
Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.
Air quality in Castanhal is worst in November — around 26 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (June, 10 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 18 | 21 | 21 | 17 | 11 | 10 | 11 | 13 | 14 | 17 | 26 | 20 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 18 | Moderate |
| Feb | 21 | Moderate |
| Mar | 21 | Moderate |
| Apr | 17 | Moderate |
| May | 11 | Good |
| Jun | 10 | Good |
| Jul | 11 | Good |
| Aug | 13 | Moderate |
| Sep | 14 | Moderate |
| Oct | 17 | Moderate |
| Nov | 26 | Moderate |
| Dec | 20 | Moderate |
Where is Castanhal?
Castanhal sits at 1.3°S, 47.9°W, 46 m above sea level, in Brazil. The nearest listed city is Santa Isabel do Pará, 26 km away.
Topography around Castanhal
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Castanhal.
Within 3 km, the terrain around Castanhal has only modest variations in elevation — a maximum elevation change of 46 m around an average of 40 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 69 m; within 80 km, only modest variations in elevation — a maximum elevation change of 96 m.
The land around Castanhal is covered by artificial surfaces (56%) and grassland (25%) within 3 km, trees (60%) and grassland (36%) within 16 km, and trees (65%) within 80 km.
Brazil travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / N
- 127 / 220 V · 60 Hz
- Prices
- ≈ 46% of US
- price level, 2025
- GDP per capita
- $10,713
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 89%
- of population, 2024
- Homicide rate
- 19.3
- per 100k, 2023
- Road deaths
- 16
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 482
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Castanhal (-1.2939°, -47.9264°, elevation 46 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).