Portsmouth weather in December
In December, Portsmouth sees average daytime highs of 45°F and overnight lows near 31°F, with 3.6 in of precipitation across 10 wet days and about 9.3 hours of daylight. It is the 10th-warmest and 6th-wettest month of the year here.
Highs ease over the month, from about 48°F in the first days to 43°F by the end. The sky is clear or mostly clear about 20% of the time in December, and the air most often feels dry.
Daylight stretches from about 9 h 30 min at the start of December to 9 h 18 min by month's end. Set against the rest of the year, December is Portsmouth's 11th-clearest and 5th-windiest month. For the whole year in context, see Portsmouth's year-round climate.
- Daytime high
- 45°
- 10th warmest
- Overnight low
- 31°
- 3rd coldest
- Precipitation
- 3.6 in
- 10 wet days
- Daylight
- 9 h 18 min
- 7:49 AM – 5:07 PM
- Cloud cover
- 71%
- 11th clearest
- Wind
- 7 mph
- 5th windiest
- Solar energy
- 1.73 kWh/m²
- Travel score
- 0.9
- out of 10
Portsmouth is city in Scioto County, Ohio, United States.
- Density
- 712/km²
- people per km²
- Founded
- 1803
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Highs ease over the month, from about 48°F in the first days to 43°F by the end.
A typical December day in Portsmouth reaches about 45°F in the afternoon and slips back to 31°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 31°F and 59°F. Set against its neighbours, December runs about 10°F cooler than November and about 4°F 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 (°F) | 49 | 48 | 48 | 47 | 47 | 47 | 46 | 46 | 46 | 46 | 45 | 45 | 45 | 45 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 |
| Avg low (°F) | 34 | 34 | 34 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 49 | 34 |
| 2 | 48 | 34 |
| 3 | 48 | 34 |
| 4 | 47 | 33 |
| 5 | 47 | 33 |
| 6 | 47 | 33 |
| 7 | 46 | 33 |
| 8 | 46 | 32 |
| 9 | 46 | 32 |
| 10 | 46 | 32 |
| 11 | 45 | 32 |
| 12 | 45 | 31 |
| 13 | 45 | 31 |
| 14 | 45 | 31 |
| 15 | 44 | 31 |
| 16 | 44 | 31 |
| 17 | 44 | 31 |
| 18 | 44 | 31 |
| 19 | 44 | 30 |
| 20 | 44 | 30 |
| 21 | 44 | 30 |
| 22 | 44 | 30 |
| 23 | 43 | 30 |
| 24 | 43 | 30 |
| 25 | 43 | 30 |
| 26 | 43 | 30 |
| 27 | 43 | 29 |
| 28 | 43 | 29 |
| 29 | 43 | 29 |
| 30 | 43 | 29 |
| 31 | 43 | 29 |
How December really feels in Portsmouth
Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 31 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
The story in December is cold — wind chill drags the overnight "feels like" below the raw low.
Portsmouth weather by month
How December compares with the rest of the year at a glance. December is the 10th-warmest and 6th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 41° / 27° | 3.4 | 10.2 | 3.6 | 9.6 | 0.1 |
| Feb | 45° / 29° | 3.4 | 10.1 | 3.7 | 10.5 | 0.8 |
| Mar | 54° / 36° | 4.2 | 12 | 1.7 | 11.7 | 3.1 |
| Apr | 66° / 47° | 4.4 | 12.4 | 0.3 | 13 | 5.6 |
| May | 74° / 56° | 4.6 | 12.9 | 0 | 14.1 | 6.2 |
| Jun | 82° / 64° | 4.3 | 13.1 | 0 | 14.7 | 5.6 |
| Jul | 85° / 68° | 3.9 | 12.5 | 0 | 14.4 | 4.9 |
| Aug | 85° / 66° | 3.0 | 11.2 | 0 | 13.5 | 5.3 |
| Sep | 79° / 59° | 3.3 | 8.1 | 0 | 12.3 | 7.0 |
| Oct | 67° / 48° | 3.1 | 9 | 0.1 | 11 | 6.3 |
| Nov | 54° / 38° | 3.2 | 8.7 | 0.6 | 9.9 | 3.5 |
| Dec | 45° / 31° | 3.6 | 10 | 2.3 | 9.3 | 0.9 |
Cloud cover in December
The sky is clear or mostly clear about 20% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 11% of December, with mostly cloudy or overcast conditions the remaining 69%.
| 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 (%) | 33 | 32 | 32 | 31 | 31 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 30 | 30 | 30 | 31 | 31 | 31 | 32 | 32 | 32 | 32 | 33 | 33 | 33 | 32 | 33 | 33 | 31 |
| Cloudier (%) | 67 | 68 | 68 | 69 | 69 | 70 | 70 | 71 | 71 | 71 | 71 | 71 | 72 | 72 | 70 | 70 | 70 | 69 | 69 | 69 | 68 | 68 | 68 | 68 | 67 | 67 | 67 | 68 | 67 | 67 | 69 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 33 | 67 |
| 2 | 32 | 68 |
| 3 | 32 | 68 |
| 4 | 31 | 69 |
| 5 | 31 | 69 |
| 6 | 30 | 70 |
| 7 | 30 | 70 |
| 8 | 29 | 71 |
| 9 | 29 | 71 |
| 10 | 29 | 71 |
| 11 | 29 | 71 |
| 12 | 29 | 71 |
| 13 | 28 | 72 |
| 14 | 28 | 72 |
| 15 | 30 | 70 |
| 16 | 30 | 70 |
| 17 | 30 | 70 |
| 18 | 31 | 69 |
| 19 | 31 | 69 |
| 20 | 31 | 69 |
| 21 | 32 | 68 |
| 22 | 32 | 68 |
| 23 | 32 | 68 |
| 24 | 32 | 68 |
| 25 | 33 | 67 |
| 26 | 33 | 67 |
| 27 | 33 | 67 |
| 28 | 32 | 68 |
| 29 | 33 | 67 |
| 30 | 33 | 67 |
| 31 | 31 | 69 |
Chance of precipitation in December
Portsmouth gets around 3.6 in of rain and snow over 10 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 32% and peaks near 34% on the wettest days, and about 2 days bring snow.
| 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 (%) | 32 | 32 | 32 | 32 | 32 | 33 | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 33 | 33 | 33 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 32 |
| Snow chance (%) | 4 | 4 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 32 | 4 |
| 2 | 32 | 4 |
| 3 | 32 | 5 |
| 4 | 32 | 5 |
| 5 | 32 | 5 |
| 6 | 33 | 6 |
| 7 | 33 | 6 |
| 8 | 33 | 6 |
| 9 | 34 | 7 |
| 10 | 34 | 7 |
| 11 | 34 | 7 |
| 12 | 34 | 7 |
| 13 | 34 | 8 |
| 14 | 34 | 8 |
| 15 | 34 | 8 |
| 16 | 34 | 8 |
| 17 | 33 | 8 |
| 18 | 33 | 8 |
| 19 | 33 | 8 |
| 20 | 32 | 8 |
| 21 | 32 | 8 |
| 22 | 32 | 8 |
| 23 | 31 | 8 |
| 24 | 31 | 8 |
| 25 | 31 | 8 |
| 26 | 31 | 8 |
| 27 | 31 | 8 |
| 28 | 31 | 8 |
| 29 | 31 | 9 |
| 30 | 32 | 9 |
| 31 | 32 | 9 |
Humidity in December
Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 100 | 100 | 100 | 99 | 99 | 99 | 99 | 99 | 99 | 98 |
| Comfortable (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 2 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| 1 | 99 | 1 |
| 2 | 99 | 1 |
| 3 | 99 | 1 |
| 4 | 99 | 1 |
| 5 | 99 | 1 |
| 6 | 99 | 1 |
| 7 | 99 | 1 |
| 8 | 99 | 1 |
| 9 | 99 | 1 |
| 10 | 99 | 1 |
| 11 | 99 | 1 |
| 12 | 99 | 1 |
| 13 | 99 | 1 |
| 14 | 99 | 1 |
| 15 | 99 | 1 |
| 16 | 99 | 1 |
| 17 | 99 | 1 |
| 18 | 99 | 1 |
| 19 | 99 | 1 |
| 20 | 99 | 1 |
| 21 | 99 | 1 |
| 22 | 100 | 0 |
| 23 | 100 | 0 |
| 24 | 100 | 0 |
| 25 | 99 | 1 |
| 26 | 99 | 1 |
| 27 | 99 | 1 |
| 28 | 99 | 1 |
| 29 | 99 | 1 |
| 30 | 99 | 1 |
| 31 | 98 | 2 |
Wind in December
Winds average 7 mph in December.
Across December, daily wind ranges from about 7 mph on the calmest days to 7 mph 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 (mph) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| 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 (mph) | Feels | |
|---|---|---|
| 1 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
| 31 | 7 | calm |
Sunrise & sunset in December
Daylight runs from about 9 h 30 min at the start of December to 9 h 18 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 12 minutes over December. Sunrise moves from 7:37 AM to 7:55 AM, and sunset from 5:06 PM to 5:15 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) | 9.5 | 9.5 | 9.5 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 |
| Sunrise (AM) | 7:37 | 7:38 | 7:39 | 7:40 | 7:41 | 7:42 | 7:42 | 7:43 | 7:44 | 7:45 | 7:46 | 7:46 | 7:47 | 7:48 | 7:48 | 7:49 | 7:50 | 7:50 | 7:51 | 7:51 | 7:52 | 7:52 | 7:53 | 7:53 | 7:54 | 7:54 | 7:54 | 7:55 | 7:55 | 7:55 | 7:55 |
| Sunset (PM) | 5:06 | 5:06 | 5:06 | 5:06 | 5:06 | 5:06 | 5:06 | 5:06 | 5:06 | 5:06 | 5:06 | 5:06 | 5:07 | 5:07 | 5:07 | 5:07 | 5:08 | 5:08 | 5:08 | 5:09 | 5:09 | 5:10 | 5:10 | 5:11 | 5:11 | 5:12 | 5:12 | 5:13 | 5:14 | 5:14 | 5:15 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 9.5 | 7:37 | 5:06 |
| 2 | 9.5 | 7:38 | 5:06 |
| 3 | 9.5 | 7:39 | 5:06 |
| 4 | 9.4 | 7:40 | 5:06 |
| 5 | 9.4 | 7:41 | 5:06 |
| 6 | 9.4 | 7:42 | 5:06 |
| 7 | 9.4 | 7:42 | 5:06 |
| 8 | 9.4 | 7:43 | 5:06 |
| 9 | 9.4 | 7:44 | 5:06 |
| 10 | 9.4 | 7:45 | 5:06 |
| 11 | 9.3 | 7:46 | 5:06 |
| 12 | 9.3 | 7:46 | 5:06 |
| 13 | 9.3 | 7:47 | 5:07 |
| 14 | 9.3 | 7:48 | 5:07 |
| 15 | 9.3 | 7:48 | 5:07 |
| 16 | 9.3 | 7:49 | 5:07 |
| 17 | 9.3 | 7:50 | 5:08 |
| 18 | 9.3 | 7:50 | 5:08 |
| 19 | 9.3 | 7:51 | 5:08 |
| 20 | 9.3 | 7:51 | 5:09 |
| 21 | 9.3 | 7:52 | 5:09 |
| 22 | 9.3 | 7:52 | 5:10 |
| 23 | 9.3 | 7:53 | 5:10 |
| 24 | 9.3 | 7:53 | 5:11 |
| 25 | 9.3 | 7:54 | 5:11 |
| 26 | 9.3 | 7:54 | 5:12 |
| 27 | 9.3 | 7:54 | 5:12 |
| 28 | 9.3 | 7:55 | 5:13 |
| 29 | 9.3 | 7:55 | 5:14 |
| 30 | 9.3 | 7:55 | 5:14 |
| 31 | 9.3 | 7:55 | 5:15 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 1.73 kWh/m² — the year's lowest.
For context, solar energy here swings from a low near 1.73 kWh/m² to a high of 6.11 kWh/m² in June across the year — December's 1.73 kWh/m² sits near the bottom.
| 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) | 1.9 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 | 1.8 |
| Level | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 1.9 | Dim |
| 2 | 1.8 | Dim |
| 3 | 1.8 | Dim |
| 4 | 1.8 | Dim |
| 5 | 1.8 | Dim |
| 6 | 1.8 | Dim |
| 7 | 1.8 | Dim |
| 8 | 1.7 | Dim |
| 9 | 1.7 | Dim |
| 10 | 1.7 | Dim |
| 11 | 1.7 | Dim |
| 12 | 1.7 | Dim |
| 13 | 1.7 | Dim |
| 14 | 1.7 | Dim |
| 15 | 1.7 | Dim |
| 16 | 1.7 | Dim |
| 17 | 1.7 | Dim |
| 18 | 1.7 | Dim |
| 19 | 1.7 | Dim |
| 20 | 1.7 | Dim |
| 21 | 1.7 | Dim |
| 22 | 1.7 | Dim |
| 23 | 1.7 | Dim |
| 24 | 1.7 | Dim |
| 25 | 1.7 | Dim |
| 26 | 1.8 | Dim |
| 27 | 1.8 | Dim |
| 28 | 1.8 | Dim |
| 29 | 1.8 | Dim |
| 30 | 1.8 | Dim |
| 31 | 1.8 | Dim |
Hazard calendar for Portsmouth
None of Portsmouth's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Portsmouth sits in the Atlantic hurricane belt; the season peaks August–October.
Is December a good time to visit Portsmouth?
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 Portsmouth.
What to pack for Portsmouth in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Portsmouth sees daytime highs around 45°F and nights near 31°F. Pack a warm layer. Worth having: a heavy coat and rain gear. About 10 days see rain.
UV index in Portsmouth in December
Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Portsmouth peaks around June 18 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 8 | 6 | 3 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Portsmouth 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 Portsmouth is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (October, 8 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) | 9 | 10 | 10 | 11 | 14 | 17 | 18 | 15 | 12 | 8 | 8 | 8 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 10 | Good |
| Mar | 10 | Good |
| Apr | 11 | Good |
| May | 14 | Moderate |
| Jun | 17 | Moderate |
| Jul | 18 | Moderate |
| Aug | 15 | Moderate |
| Sep | 12 | Good |
| Oct | 8 | Good |
| Nov | 8 | Good |
| Dec | 8 | Good |
Where is Portsmouth?
Portsmouth sits at 38.7°N, 83.0°W, 531 ft above sea level, in United States. The nearest listed city is Ashland, 26 mi away.
Topography around Portsmouth
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Portsmouth.
Within 2 miles, the terrain around Portsmouth has only modest variations in elevation — a maximum elevation change of 640 ft around an average of 620 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 817 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 925 ft.
The land around Portsmouth is covered by trees (42%) within 2 miles, trees (77%) within 10 miles, and trees (77%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- 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 Portsmouth (38.7317°, -82.9977°, elevation 531 ft), 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).