Warmest month
- London
- July · 18.57 °C
- Siem Reap
- April · 29.67 °C
London (Great Britain) vs Siem Reap (Cambodia): Temperature, Rainfall and Sunshine
Reference period: London 2013–2023 · Siem Reap 2013–2023
Siem Reap (Cambodia) has a higher monthly mean temperature than London (Great Britain) in every month of the year.
Key monthly differences
Coolest month
- London
- January · 4.73 °C
- Siem Reap
- December · 25.39 °C
Driest month
- London
- April · 1.33 mm/day
- Siem Reap
- January · 0.57 mm/day
Sunniest month
- London
- July · 10.94 hours/day
- Siem Reap
- March · 10.82 hours/day
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Climate comparison questions
When are the temperatures most similar and most different?
The smallest difference in monthly mean temperature is 9.31 °C (July); the largest is 22.71 °C (March).
How much do temperatures vary across the year?
The difference between the warmest and coolest monthly means is 13.84 °C in London (Great Britain) and 4.28 °C in Siem Reap (Cambodia). This describes seasonal variation, not the range between daytime highs and nighttime lows.
Which location has more rainfall?
London (Great Britain) has a higher daily rainfall average in 4 months and Siem Reap (Cambodia) in 8; 0 months are equal at the displayed precision. Rainfall amounts do not tell us how many days it rains.
Which location has more sunshine?
London (Great Britain) has more average sunshine hours per day in 4 months and Siem Reap (Cambodia) in 8; 0 months are equal at the displayed precision. Sunshine duration is different from daylight duration.
Climate data notes
Show data and calculation
Daily values are averaged separately for each calendar month over the saved reference period. Temperatures are daily means, not daytime highs. Rainfall is an average daily amount, not a monthly total; sunshine is average hours per day. These historical averages are not a weather forecast. Each location’s reference period is listed below and may differ.
Mean of the 12 monthly averages
Monthly climate data
Difference: Siem Reap (Cambodia) minus London (Great Britain)
Temperature °C
| Month | London | Siem Reap | +/- |
|---|---|---|---|
| Jan | 4.73 | 26.00 | +21.27 |
| Feb | 5.44 | 27.41 | +21.97 |
| Mar | 6.84 | 29.54 | +22.71 |
| Apr | 9.18 | 29.67 | +20.49 |
| May | 12.67 | 29.40 | +16.73 |
| Jun | 16.27 | 28.62 | +12.35 |
| Jul | 18.57 | 27.88 | +9.31 |
| Aug | 17.74 | 27.74 | +10.00 |
| Sep | 15.48 | 26.99 | +11.50 |
| Oct | 12.31 | 26.60 | +14.29 |
| Nov | 8.09 | 26.56 | +18.47 |
| Dec | 6.52 | 25.39 | +18.88 |
| Annual mean | 11.15 | 27.65 | +16.50 |
Average sunshine (hours/day)
| Month | London | Siem Reap | +/- |
|---|---|---|---|
| Jan | 3.74 | 10.01 | +6.27 |
| Feb | 5.11 | 10.48 | +5.37 |
| Mar | 6.38 | 10.82 | +4.44 |
| Apr | 9.22 | 10.57 | +1.35 |
| May | 10.11 | 10.31 | +0.20 |
| Jun | 10.51 | 9.38 | −1.13 |
| Jul | 10.94 | 8.26 | −2.68 |
| Aug | 9.68 | 8.26 | −1.42 |
| Sep | 8.02 | 7.61 | −0.41 |
| Oct | 5.86 | 8.55 | +2.69 |
| Nov | 4.12 | 9.39 | +5.27 |
| Dec | 3.14 | 9.50 | +6.36 |
| Annual mean | 7.24 | 9.43 | +2.19 |
Average daily rainfall (mm/day)
| Month | London | Siem Reap | +/- |
|---|---|---|---|
| Jan | 1.92 | 0.57 | −1.36 |
| Feb | 1.71 | 0.72 | −0.99 |
| Mar | 1.61 | 1.47 | −0.14 |
| Apr | 1.33 | 3.75 | +2.42 |
| May | 1.85 | 5.73 | +3.88 |
| Jun | 1.93 | 5.19 | +3.26 |
| Jul | 1.79 | 6.31 | +4.51 |
| Aug | 2.02 | 6.64 | +4.62 |
| Sep | 1.61 | 10.30 | +8.68 |
| Oct | 2.51 | 8.12 | +5.61 |
| Nov | 2.27 | 3.29 | +1.02 |
| Dec | 2.10 | 0.86 | −1.25 |
| Annual mean | 1.89 | 4.41 | +2.52 |
Snow (mm)
| Month | London | Siem Reap | +/- |
|---|---|---|---|
| Jan | 0.94 | 0.00 | −0.94 |
| Feb | 0.76 | 0.00 | −0.76 |
| Mar | 0.77 | 0.00 | −0.77 |
| Apr | 0.05 | 0.00 | −0.05 |
| May | 0.00 | 0.00 | 0.00 |
| Jun | 0.00 | 0.00 | 0.00 |
| Jul | 0.00 | 0.00 | 0.00 |
| Aug | 0.00 | 0.00 | 0.00 |
| Sep | 0.00 | 0.00 | 0.00 |
| Oct | 0.00 | 0.00 | 0.00 |
| Nov | 0.04 | 0.00 | −0.04 |
| Dec | 0.40 | 0.00 | −0.40 |
| Annual mean | 0.25 | 0.00 | −0.25 |
