Climate and average weather in Subulussalam
In Subulussalam, the weather is muggy, hot, wet, and mostly cloudy and remarkably steady, with daytime highs holding near hot levels all year. The wettest stretch peaks around November.
Over the course of the year, the temperature in Subulussalam typically varies from 20°C to 30°C, and is rarely below 19°C or above 32°C. February is the hottest month of the year, while November is the coldest.
Based on the travel score, the best time of year to visit Subulussalam for warm-weather activities is from mid May to late October.
- Hottest
- Feb
- 30°
- Coldest
- Nov
- 21°
- Wettest
- Nov
- 510 mm
- Driest
- Jun
- 150 mm
- Rain / yr
- 3754 mm
- 286 wet days
- Daylight
- 11.8–12.2 h
- shortest–longest
- Elevation
- 29 m
- 2.7°N
- Clearest
- Jun
- 81% cloud
Subulussalam weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around mid May to late October.
Temperature through the year
Daily average highs and lows in Subulussalam, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
Temperatures in Subulussalam stay fairly even through the year, without a distinct hot or cool season. The warmest month is February, with an average high of 30°C and low of 20°C; the coolest is November, with an average low of 21°C and high of 28°C.
Days typically run about 9°C warmer than nights year-round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 28 | 29 |
| Avg low (°C) | 20 | 20 | 21 | 21 | 21 | 21 | 20 | 20 | 21 | 21 | 21 | 21 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 30 | 20 |
| Feb | 30 | 20 |
| Mar | 30 | 21 |
| Apr | 30 | 21 |
| May | 30 | 21 |
| Jun | 30 | 21 |
| Jul | 30 | 20 |
| Aug | 29 | 20 |
| Sep | 29 | 21 |
| Oct | 29 | 21 |
| Nov | 28 | 21 |
| Dec | 29 | 21 |
How hot and cold Subulussalam really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the hottest afternoons, once humidity is folded in, Subulussalam feels like about 34°C (around March 10). About 238 days a year carry some heat stress, peaking in March.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 33 | 34 | 34 | 33 | 34 | 33 | 32 | 32 | 32 | 31 | 31 | 32 |
| Air high (°C) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 28 | 29 |
| Feels-like low (°C) | 20 | 20 | 21 | 21 | 21 | 21 | 20 | 20 | 21 | 21 | 21 | 21 |
| Air low (°C) | 20 | 20 | 21 | 21 | 21 | 21 | 20 | 20 | 21 | 21 | 21 | 21 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 33 | 30 | 20 | 20 |
| Feb | 34 | 30 | 20 | 20 |
| Mar | 34 | 30 | 21 | 21 |
| Apr | 33 | 30 | 21 | 21 |
| May | 34 | 30 | 21 | 21 |
| Jun | 33 | 30 | 21 | 21 |
| Jul | 32 | 30 | 20 | 20 |
| Aug | 32 | 29 | 20 | 20 |
| Sep | 32 | 29 | 21 | 21 |
| Oct | 31 | 29 | 21 | 21 |
| Nov | 31 | 28 | 21 | 21 |
| Dec | 32 | 29 | 21 | 21 |
Average hourly temperature in Subulussalam
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on February afternoons, near 30°C, and coldest before dawn in November, near 21°C.
Subulussalam weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 30° / 20° | 327 | 26.3 | 11.9 | 3.1 |
| Feb | 30° / 20° | 289 | 23.9 | 11.9 | 2.9 |
| Mar | 30° / 21° | 339 | 28.2 | 12 | 2.8 |
| Apr | 30° / 21° | 368 | 27.3 | 12.1 | 2.8 |
| May | 30° / 21° | 264 | 21.4 | 12.1 | 3.4 |
| Jun | 30° / 21° | 150 | 16.7 | 12.2 | 3.9 |
| Jul | 30° / 20° | 160 | 17.7 | 12.1 | 4.0 |
| Aug | 29° / 20° | 238 | 20.7 | 12.1 | 3.8 |
| Sep | 29° / 21° | 295 | 22.5 | 12 | 3.6 |
| Oct | 29° / 21° | 419 | 26 | 11.9 | 3.4 |
| Nov | 28° / 21° | 510 | 28.2 | 11.9 | 3.1 |
| Dec | 29° / 21° | 395 | 27.5 | 11.8 | 3.1 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Subulussalam gets about 3754 mm of precipitation a year. On a typical day the chance of rain is very wet, but that rises and falls sharply with the seasons.
The wetter season lasts 7.2 months, from around Sep 29 to May 5, peaking in November at about 95% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jun 21.
November is the wettest month by volume, with 510 mm over about 28 wet days; June is the driest, with 150 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 85 | 85 | 91 | 90 | 69 | 56 | 57 | 67 | 75 | 84 | 93 | 89 |
| Rain days | 26 | 24 | 28 | 27 | 21 | 17 | 18 | 21 | 23 | 26 | 28 | 28 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 85 | 26 |
| Feb | 85 | 24 |
| Mar | 91 | 28 |
| Apr | 90 | 27 |
| May | 69 | 21 |
| Jun | 56 | 17 |
| Jul | 57 | 18 |
| Aug | 67 | 21 |
| Sep | 75 | 23 |
| Oct | 84 | 26 |
| Nov | 93 | 28 |
| Dec | 89 | 28 |
Monthly rainfall
Over a full year, Subulussalam collects about 3754 mm of rain across 286 wet days — roughly 313 mm in an average month.
It doesn’t fall evenly. November is the wettest month with 510 mm, while June is the driest at just 150 mm. The three wettest months alone bring about 35% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 327 | 289 | 339 | 368 | 264 | 150 | 160 | 238 | 295 | 419 | 510 | 395 |
| Rain days | 26 | 24 | 28 | 27 | 21 | 17 | 18 | 21 | 23 | 26 | 28 | 28 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 327 | 26 |
| Feb | 289 | 24 |
| Mar | 339 | 28 |
| Apr | 368 | 27 |
| May | 264 | 21 |
| Jun | 150 | 17 |
| Jul | 160 | 18 |
| Aug | 238 | 21 |
| Sep | 295 | 23 |
| Oct | 419 | 26 |
| Nov | 510 | 28 |
| Dec | 395 | 28 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Subulussalam, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.
The clearer part of the year begins around May 10 and lasts for 3.0 months, ending around August 9. The clearest month is June, when the sky is clear, mostly clear, or partly cloudy 16% of the time on average.
The cloudier part of the year begins around August 10 and lasts for 4.7 months, ending around December 29. The cloudiest month is November, when it is overcast or mostly cloudy 98% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 12 | 14 | 11 | 4 | 10 | 16 | 12 | 7 | 3 | 3 | 2 | 5 |
| Cloudier (%) | 88 | 86 | 89 | 96 | 90 | 84 | 88 | 93 | 97 | 97 | 98 | 95 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 12 | 88 |
| Feb | 14 | 86 |
| Mar | 11 | 89 |
| Apr | 4 | 96 |
| May | 10 | 90 |
| Jun | 16 | 84 |
| Jul | 12 | 88 |
| Aug | 7 | 93 |
| Sep | 3 | 97 |
| Oct | 3 | 97 |
| Nov | 2 | 98 |
| Dec | 5 | 95 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. Close to the equator, Subulussalam barely changes through the year: days stay near 12 h 12 min of light in every season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.9 | 11.9 | 12.0 | 12.1 | 12.1 | 12.2 | 12.1 | 12.1 | 12.0 | 11.9 | 11.9 | 11.8 |
| Sunrise (AM) | 6:42 | 6:46 | 6:39 | 6:27 | 6:21 | 6:24 | 6:30 | 6:30 | 6:22 | 6:15 | 6:17 | 6:29 |
| Sunset (PM) | 6:34 | 6:40 | 6:38 | 6:30 | 6:28 | 6:33 | 6:38 | 6:35 | 6:23 | 6:12 | 6:10 | 6:20 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 11.9 | 6:42 | 6:34 |
| Feb | 11.9 | 6:46 | 6:40 |
| Mar | 12.0 | 6:39 | 6:38 |
| Apr | 12.1 | 6:27 | 6:30 |
| May | 12.1 | 6:21 | 6:28 |
| Jun | 12.2 | 6:24 | 6:33 |
| Jul | 12.1 | 6:30 | 6:38 |
| Aug | 12.1 | 6:30 | 6:35 |
| Sep | 12.0 | 6:22 | 6:23 |
| Oct | 11.9 | 6:15 | 6:12 |
| Nov | 11.9 | 6:17 | 6:10 |
| Dec | 11.8 | 6:29 | 6:20 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Subulussalam gets about 1 sunny days a month — gloomy — and it barely shifts through the year, holding between 0 and 2 days every month. Clear skies here are a flat line, not a season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 1 | 1 | 1 | 0 | 1 | 2 | 2 | 1 | 0 | 0 | 0 | 0 |
| Sky | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy |
| Sunny days | Sky | |
|---|---|---|
| Jan | 1 | Gloomy |
| Feb | 1 | Gloomy |
| Mar | 1 | Gloomy |
| Apr | 0 | Gloomy |
| May | 1 | Gloomy |
| Jun | 2 | Gloomy |
| Jul | 2 | Gloomy |
| Aug | 1 | Gloomy |
| Sep | 0 | Gloomy |
| Oct | 0 | Gloomy |
| Nov | 0 | Gloomy |
| Dec | 0 | Gloomy |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
Subulussalam is humid all year round — on a typical day the air feels at least humid, and there is no real dry season to wait for.
The stickiest month is January, when it feels muggy, oppressive or miserable about 100% of the time. Even in January, the mildest month, the air is dry or comfortable only 0% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Muggy (%) | 13 | 12 | 6 | 3 | 8 | 20 | 37 | 31 | 26 | 17 | 6 | 7 |
| Oppressive (%) | 87 | 88 | 93 | 96 | 91 | 79 | 63 | 69 | 74 | 83 | 94 | 93 |
| Miserable (%) | 0 | 0 | 1 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|
| Jan | 13 | 87 | 0 |
| Feb | 12 | 88 | 0 |
| Mar | 6 | 93 | 1 |
| Apr | 3 | 96 | 2 |
| May | 8 | 91 | 1 |
| Jun | 20 | 79 | 0 |
| Jul | 37 | 63 | 0 |
| Aug | 31 | 69 | 0 |
| Sep | 26 | 74 | 0 |
| Oct | 17 | 83 | 0 |
| Nov | 6 | 94 | 0 |
| Dec | 7 | 93 | 0 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Wind in Subulussalam is steady company: average speeds sit near 4 km/h — calm — in every month of the year, with no meaningful windy or calm season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 3 | calm |
| Feb | 3 | calm |
| Mar | 3 | calm |
| Apr | 3 | calm |
| May | 4 | calm |
| Jun | 4 | calm |
| Jul | 4 | calm |
| Aug | 4 | calm |
| Sep | 4 | calm |
| Oct | 4 | calm |
| Nov | 3 | calm |
| Dec | 3 | calm |
Hazard calendar for Subulussalam
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
Subulussalam sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.
Best time to visit Subulussalam
To characterize how pleasant the weather is in Subulussalam throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around mid October, Subulussalam is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit Subulussalam for general outdoor tourist activities is from mid May to late October, with a peak score in the last week of July.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 3.1 | 2.9 | 2.8 | 2.8 | 3.4 | 3.9 | 4.0 | 3.8 | 3.6 | 3.4 | 3.1 | 3.1 |
| Rating | poor | poor | poor | poor | poor | fair | fair | fair | fair | poor | poor | poor |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 3.1 | poor |
| Feb | 2.9 | poor |
| Mar | 2.8 | poor |
| Apr | 2.8 | poor |
| May | 3.4 | poor |
| Jun | 3.9 | fair |
| Jul | 4.0 | fair |
| Aug | 3.8 | fair |
| Sep | 3.6 | fair |
| Oct | 3.4 | poor |
| Nov | 3.1 | poor |
| Dec | 3.1 | poor |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit Subulussalam for hot-weather activities is from early May to late September, with a peak score in the last week of June.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for Subulussalam, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
Subulussalam packs about the same all year — highs hold near 30°C. Across the year the things worth having are light clothes, rain gear and sun protection.
In February, Subulussalam sees daytime highs around 30°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.
Sea temperature near Subulussalam
Average ocean temperature at the nearest coast, month by month, banded into swim-comfort zones — the other half of the beach question.
The sea at the nearest coast (about 29 km away) is warmest in May at about 30°C and coldest in November near 29°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 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 30 | Tropical |
| Mar | 30 | Tropical |
| Apr | 30 | Tropical |
| May | 30 | Tropical |
| Jun | 30 | Tropical |
| Jul | 30 | Tropical |
| Aug | 30 | Tropical |
| Sep | 30 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 29 | Tropical |
UV index (midday) in Subulussalam by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in Subulussalam peaks around March 15 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 at about 11 (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 | 13 | 12 | 11 | 11 | 12 | 14 | 13 | 11 | 12 |
| 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 | 13 | Extreme |
| May | 12 | Extreme |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 12 | Extreme |
| Sep | 14 | Extreme |
| Oct | 13 | Extreme |
| Nov | 11 | Extreme |
| Dec | 12 | Extreme |
Average hourly UV index in Subulussalam
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in March the burn window is concentrated in the middle of the day: about 8 hours a day reach index 3 (protection recommended), and 6.5 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 7.5 | 8 | 8 | 8 | 8 | 8 | 7.5 | 8 | 8 | 8 | 7.5 | 7.5 |
| UV ≥ 6 (h/day) | 6 | 6.5 | 6.5 | 6.5 | 5.5 | 5.5 | 5.5 | 6 | 6 | 6 | 5.5 | 5.5 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 7.5 | 6 |
| Feb | 8 | 6.5 |
| Mar | 8 | 6.5 |
| Apr | 8 | 6.5 |
| May | 8 | 5.5 |
| Jun | 8 | 5.5 |
| Jul | 7.5 | 5.5 |
| Aug | 8 | 6 |
| Sep | 8 | 6 |
| Oct | 8 | 6 |
| Nov | 7.5 | 5.5 |
| Dec | 7.5 | 5.5 |
Air quality in Subulussalam by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in Subulussalam is worst in March — around 25 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 21 | 24 | 25 | 23 | 21 | 21 | 20 | 20 | 24 | 23 | 19 | 18 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 21 | Moderate |
| Feb | 24 | Moderate |
| Mar | 25 | Moderate |
| Apr | 23 | Moderate |
| May | 21 | Moderate |
| Jun | 21 | Moderate |
| Jul | 20 | Moderate |
| Aug | 20 | Moderate |
| Sep | 24 | Moderate |
| Oct | 23 | Moderate |
| Nov | 19 | Moderate |
| Dec | 18 | Moderate |
Growing season
Subulussalam is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 100 | 0 |
| Dec | 100 | 0 |
Growing degree days
Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Subulussalam banks about 5,485 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around May.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 463 | 426 | 476 | 463 | 484 | 462 | 464 | 459 | 442 | 453 | 436 | 456 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 463 |
| Feb | 426 |
| Mar | 476 |
| Apr | 463 |
| May | 484 |
| Jun | 462 |
| Jul | 464 |
| Aug | 459 |
| Sep | 442 |
| Oct | 453 |
| Nov | 436 |
| Dec | 456 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
Subulussalam receives about 4.7 kWh/m² a day of solar energy — bright — and it stays remarkably steady, holding between 3.8 and 5.3 kWh/m² all year. For solar panels, output here is a flat line, not a seasonal wave.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.8 | 5.3 | 5.2 | 4.8 | 4.9 | 5.0 | 4.9 | 4.8 | 4.7 | 4.3 | 3.9 | 4.1 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 4.8 | Bright |
| Feb | 5.3 | Bright |
| Mar | 5.2 | Bright |
| Apr | 4.8 | Bright |
| May | 4.9 | Bright |
| Jun | 5.0 | Bright |
| Jul | 4.9 | Bright |
| Aug | 4.8 | Bright |
| Sep | 4.7 | Bright |
| Oct | 4.3 | Bright |
| Nov | 3.9 | Moderate |
| Dec | 4.1 | Bright |
Where is Subulussalam?
Subulussalam sits at 2.7°N, 97.9°E, 29 m above sea level, in Indonesia. The nearest listed city is Singkil, 43 km away.
Topography around Subulussalam
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Subulussalam.
Within 3 km, the terrain around Subulussalam has only modest variations in elevation — a maximum elevation change of 40 m around an average of 21 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 205 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,429 m.
The land around Subulussalam is covered by trees (90%) within 3 km, trees (92%) within 16 km, and trees (63%) and water (33%) within 80 km.
Indonesia travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 29% of US
- price level, 2025
- GDP per capita
- $5,060
- 2025
- Happiness
- 5.6 / 10
- World Happiness, 2025
- Safe drinking water
- 30%
- of population, 2024
- Homicide rate
- 0.3
- per 100k, 2022
- Road deaths
- 11.3
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 471
- 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 Subulussalam (2.662°, 97.8827°, elevation 29 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).