Photo by Random Institute on Unsplash
Bo, Sierra Leone is a 377K-resident city with 172 sunny days and 0 frost days annually and an annual PM2.5 of 26.5 µg/m³. Sierra Leone's second-largest city.
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Dinner outside
Monthly climate metrics across temperature, precipitation, wind, and UV.
| Metric | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temperature | |||||||||||||
| Daily high°C | 35 | 37 | 36 | 34 | 32 | 30 | 29 | 28 | 29 | 30 | 31 | 32 | 32 |
| Daily mean°C | 31 | 32 | 31 | 29 | 28 | 26 | 25 | 25 | 25 | 26 | 27 | 28 | 28 |
| Daily low°C | 24 | 25 | 25 | 25 | 25 | 23 | 23 | 23 | 23 | 23 | 24 | 23 | 24 |
| Thermal comfort | |||||||||||||
| High feelsDaily high feels-like°C | 39 | 40 | 40 | 39 | 38 | 36 | 34 | 33 | 35 | 37 | 38 | 38 | 37 |
| Mean feelsDaily mean feels-like°C | 34 | 34 | 33 | 33 | 32 | 30 | 28 | 28 | 28 | 31 | 33 | 33 | 31 |
| Low feelsDaily low feels-like°C | 25 | 26 | 26 | 27 | 27 | 25 | 24 | 24 | 25 | 25 | 26 | 24 | 25 |
| Humidity | |||||||||||||
| HumidityRelative humidity% | 59 | 55 | 63 | 69 | 82 | 88 | 92 | 92 | 91 | 89 | 87 | 76 | 79 |
| Dewpoint°C | 20.9 | 21.4 | 23.2 | 23.7 | 24.3 | 23.6 | 23.0 | 22.9 | 23.2 | 23.8 | 24.0 | 23.1 | 23.1 |
| Precipitation | |||||||||||||
| Rainfallmm | 5 | 5 | 35 | 92 | 213 | 314 | 355 | 411 | 313 | 278 | 93 | 17 | 2130 |
| Rain days≥1mm | 1 | 2 | 8 | 14 | 25 | 28 | 30 | 29 | 29 | 28 | 17 | 5 | 216 |
| Wind | |||||||||||||
| Wind avgm/s | 1.2 | 1.3 | 1.4 | 1.3 | 1.3 | 1.4 | 1.5 | 1.7 | 1.4 | 1.1 | 0.9 | 1.1 | 1.3 |
| Wind gustsm/s | 3.3 | 3.7 | 3.5 | 3.0 | 2.8 | 2.6 | 2.8 | 2.9 | 2.8 | 2.2 | 2.3 | 2.7 | 2.9 |
| Sun & UV | |||||||||||||
| Sunshinehrs/day | 9.0 | 9.1 | 8.9 | 8.7 | 8.3 | 7.7 | 7.0 | 5.0 | 6.0 | 8.0 | 8.3 | 8.9 | 7.9 |
| Clear skyindex | 64% | 71% | 47% | 32% | 28% | 24% | 17% | 14% | 17% | 26% | 41% | 52% | 36% |
| UV indexmax avg | 8.4 | 9.2 | 8.5 | 7.5 | 7.6 | 7.0 | 5.4 | 5.7 | 6.0 | 7.0 | 7.6 | 7.5 | 7.3 |
Outdoor activities in Bo are challenging most of the year. 7 months of the year are the toughest stretch. Even dinner outside manages 3/12 months, while even walking manages 2/12 months.
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Air Quality
Bo reports an annual PM2.5 of 26.5 µg/m³. That's above the EU annual limit of 25 µg/m³ — long-term exposure here carries documented health trade-offs.
Bo reports an annual PM2.5 of 26.5 µg/m³. That's above the EU annual limit of 25 µg/m³ — long-term exposure here carries documented health trade-offs.
PM2.5 annual average of 26.5 µg/m³ exceeds the WHO interim target of 15 µg/m³. The WHO guideline value is 5 µg/m³.
Data sources: WHO (air quality), OECD (safety).
Why not Bo? Honestly, air quality is a meaningful downside — at 26.5 µg/m³ annual PM2.5, Bo sits above the EU limit, which may matter for allergy sufferers or long-term residents.