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Weather information is an important factor to consider when deciding where or when to travel. The following table offers our opinion on when it is best to travel throughout the year, with the "Green Season" representing months with higher rainfall. "Green Season" days in the Far East tend to be dry in the morning with short sharp showers in the afternoon. Below this we offer average climate statistics, from selected destinations, and a general overview of the country's climate to help you decide when to travel.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec |
| 32 | 33 | 34 | 35 | 34 | 33 | 32 | 32 | 32 | 31 | 31 | 31 | |
| 20 | 22 | 24 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 22 | 20 | |
| 9 | 8 | 9 | 8 | 8 | 6 | 5 | 5 | 5 | 6 | 8 | 9 | |
| 8 | 20 | 36 | 58 | 198 | 160 | 160 | 175 | 305 | 206 | 66 | 5 | |
| jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec |
| 29 | 32 | 34 | 36 | 34 | 32 | 31 | 31 | 31 | 31 | 30 | 28 | |
| 13 | 14 | 17 | 22 | 23 | 23 | 23 | 23 | 23 | 21 | 19 | 5 | |
| 9 | 9 | 9 | 9 | 8 | 6 | 5 | 4 | 6 | 7 | 8 | 9 | |
| 0 | 10 | 8 | 36 | 122 | 112 | 213 | 193 | 249 | 94 | 31 | 13 | |
| jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec |
| 30 | 31 | 32 | 32 | 32 | 32 | 31 | 32 | 31 | 31 | 31 | 30 | |
| 22 | 23 | 24 | 24 | 24 | 24 | 23 | 24 | 23 | 23 | 23 | 22 | |
| 9 | 8 | 9 | 8 | 8 | 6 | 5 | 5 | 5 | 6 | 8 | 9 | |
| 35 | 24 | 39 | 133 | 324 | 218 | 263 | 263 | 374 | 305 | 181 | 52 | |
| jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec |
Thailand has three major seasons. The cool season runs from November to February, the hot season from March until the beginning of June and the rainy season from May to October. During the rainy season about four fifths of the total annual precipitation is received. The best time to visit Thailand is from November to March when temperatures are relatively low and when there is little rain. Note that in December and January the temperatures can drop to near freezing at night in the northeast highlands around Chiang Mai, Chiang Rai and Mae Hong Son.
The monsoon starts between mid-May and mid-June bringing frequent rain and lasts until October. That said it does not rain all day every day and quite often travelling at this time can be quite pleasant as there are less visitors and there is usually plenty of sunshine as well. The monsoon in Koh Samui tends to start a little later than other parts of the country and often extends into November.