Datasets
Climate Normals and Outdoor-Attire Anchors
Changi 1991–2020 MSS climate normals for rainfall, temperature, and humidity, plus NEA/MOH heat and UV attire anchors used for Singapore weather-and-clothing retrieval.
Climate Normals and Outdoor-Attire Anchors
These rows summarise Meteorological Service Singapore Changi climate-station normals for 1991–2020 and NEA/MOH outdoor-attire anchors verified as of 8 Aug 2026. They are climatological and advisory references, not a daily forecast for any neighbourhood.
Annual and diurnal climate anchors (Changi, 1991–2020)
| Anchor | Value | Notes |
|---|---|---|
| Mean annual rainfall | 2,113.3 mm | Changi climate station |
| Mean rain days per year | 171 | Day counts if rainfall ≥0.2 mm |
| Mean annual relative humidity | ~82% | 24-hour mean around this level |
| Typical overnight minimum band | ~23–25°C | Usual daily minimum band stated by MSS |
| Typical daytime maximum band | ~31–33°C | Usual daily maximum band stated by MSS |
| Coolest months (24-hr mean) | 26.8°C (Dec, Jan) | Monthly 24-hour means |
| Warmest month (24-hr mean) | 28.6°C (May) | Monthly 24-hour means |
| Mean daily maximum range (months) | 30.5–32.4°C | Dec lowest; Apr highest |
| Mean daily minimum range (months) | 24.3–25.7°C | Jan/Dec lowest; May/Jun highest |
| Pre-sunrise RH (no rain) | >90% often | Diurnal humidity pattern |
| Afternoon RH (no rain) | ~60% often | Diurnal humidity pattern |
| Mean surface wind speed | ~2 m/s | Generally light; stronger in NE Monsoon |
Source: MSS Climate of Singapore, accessed 8 Aug 2026.
Monthly rainfall and rain-day normals (Changi, 1991–2020)
| Month | Mean rainfall (mm) | Mean rain days |
|---|---|---|
| Jan | 221.6 | 13 |
| Feb | 105.1 | 9 |
| Mar | 151.7 | 12 |
| Apr | 164.3 | 15 |
| May | 164.3 | 15 |
| Jun | 135.3 | 13 |
| Jul | 146.6 | 14 |
| Aug | 146.9 | 14 |
| Sep | 124.9 | 13 |
| Oct | 168.3 | 15 |
| Nov | 252.3 | 19 |
| Dec | 331.9 | 19 |
Source: MSS Climate of Singapore, accessed 8 Aug 2026. Higher rainfall typically November–January; February driest in this climatology.
Monsoon calendar anchors
| Period | Approx. timing | Clothing-relevant climatology |
|---|---|---|
| Northeast Monsoon (wet phase) | Dec–early Jan (within Dec–early Mar season) | Widespread moderate to heavy rain possible during surges |
| Northeast Monsoon (dry phase) | Late Jan–early Mar | Relatively drier and windier |
| Inter-monsoon | Late Mar–May | Afternoon/evening thunderstorms; hot afternoons (max >32°C common) |
| Southwest Monsoon | Jun–Sep | Sumatra squalls possible pre-dawn to midday; afternoon short storms common |
| Inter-monsoon | Oct–Nov | Afternoon/evening thunderstorms; generally wetter than Mar–May inter-monsoon |
Source: MSS Climate of Singapore, accessed 8 Aug 2026.
Official outdoor-attire and sun-protection anchors
| Anchor | Rule / guidance | Source |
|---|---|---|
| Warm-weather clothing | Loose-fitting, heat-permeable, light-coloured clothing | MSS warm-weather public advisory |
| Peak UV hours (sun protection) | Especially 11 am–3 pm | NEA/MSS UV pages (MOH measures) |
| Peak heat/UV outdoor caution (schools context) | Sustained outdoor activity caution 11 am–4 pm | MSS warm-weather annex |
| Sunscreen | At least SPF 30 | NEA/MSS UV (MOH) |
| Shade accessories | Umbrella and seek shade; broad-brimmed hat; UVA/UVB-blocking sunglasses | NEA/MSS UV (MOH) |
| Heat-stress product | Low / moderate / high levels from WBGT; check myENV or weather.gov.sg before prolonged outdoor sun exposure | NEA/MSE Heat Stress Advisory; MSS Heat Stress page |
These attire rows are public health and meteorological advisories for outdoor exposure. They do not prescribe workplace uniforms, school dress codes, or fashion norms.
Observed 2025 climate versus normals
| Measure | 2025 observation | Reference population / period |
|---|---|---|
| Islandwide average annual rainfall | 2,984.9 mm | Average across 32 stations with continuous records; 18% above long-term average; 7th-wettest year since 1980 |
| Changi annual rainfall | 2,833.5 mm | Changi station; 34% above its 1991–2020 average of 2,113.3 mm |
| Annual mean temperature | 28.1°C | Climate-station record; joint 8th warmest since 1929 |
| Monthly extremes | Wettest March; warmest June and November | Calendar year 2025 |
Source: MSS 2025 climate assessment highlights, accessed 13 August 2026. Do not substitute these observed-year values for the Changi 1991–2020 normals above.
Record details
- Also known as
- ["Changi climate normals","Singapore rainfall normal","Singapore UV clothing"]
- Jurisdiction
- SG
- What each row represents
- one Changi 1991–2020 climate normal or NEA/MOH outdoor-attire/UV/heat-stress advisory anchor
- Update cadence
- after MSS publishes a new climate-normals period or NEA revises heat/UV advisories
- Source format
- markdown
Dates describe this record’s own period and applicability. A verification date does not mean a rule is currently in force.
Sources
- Meteorological Service Singapore — Climate of Singapore Accessed 2026-08-08
- Meteorological Service Singapore — Warm weather heat advisories Accessed 2026-08-08
- NEA — Ultraviolet Index and sun-protection measures Accessed 2026-08-08
- Meteorological Service Singapore — Ultraviolet Index Accessed 2026-08-08
- Meteorological Service Singapore — Heat Stress Advisory Accessed 2026-08-08
- MSS — 2025 Annual Climate Assessment highlights Accessed 2026-08-13
Collection as of 2026-10-07 · An expanding collection. Published counts show available knowledge, not complete coverage of Singapore.