Indicator · TLI ind_rainfall_days_per_year

Wet Days Per Year (≥ 1 mm Rainfall)

จำนวนวันที่มีฝนตก (ฝน ≥ 1 มม.) ต่อปี

AS OF 31 DEC 2024wet days/yrWeight 0.5

Source

NASA POWER (bias-corrected precipitation reanalysis)

NASA satellite-and-reanalysis climate dataset; daily-precipitation grid covering all 77 Thai provinces. Refresh: monthly upstream (NASA POWER finalizes a rolling 60-day window); TLI re-pulls annually for the rainfall-days metric.

Goalposts

The 0-to-100 score for this indicator is normalized against fixed methodology goalposts. The values below define the band; click through to the methodology page for the framework that anchors them.

Score 100 plateau: 100 – 200wet days/yr
Score 0 floors: ≤ 50 or ≥ 280wet days/yr
Direction: Mid-range is best (parabolic curve)
Anchor: Fitted to the Thai provincial distribution

Rainfall scoring is parabolic, not monotonic: too few rainy days indicates drought stress and too many indicates rain-saturated discomfort. The score-zero floors sit at 50 days and 280 days; the score-100 plateau runs from 100 to 200 days. The plateau matches the central band of the observed Thai NASA POWER distribution; the floors sit roughly fifty days outside the empirical extremes to absorb year-over-year movement without saturating either end.

Live distribution: 59 of 77 provinces clip at the score-100 ceiling.

Which Thai province leads on Wet Days Per Year (≥ 1 mm Rainfall)?

59 Thai provinces share the maximum TLI score of 100/100 on Wet Days Per Year (≥ 1 mm Rainfall); the strongest by raw value are Chon Buri, Chachoengsao, and Phetchaburi (raw values from 178.5 to 187.5 wet days/yr). The bottom of the distribution is Phuket (256.3 wet days/yr, score 29.6/100).

Coverage

77 of 77 Thai provinces. Median score: 100. Each province's score is normalized 0–100 against fixed goalposts; a higher score is more favorable.

Reading the columns.Raw valuethe actual measurement in wet days/yr.Scorenormalized 0–100 against fixed methodology goalposts (not a percentile). Mid-range is best (parabolic curve).Why ties?59 provinces share the score-100 ceiling because their raw values meet or exceed the upper goalpost. Provinces beyond the goalposts aren't separated further — that's the trade-off for fixed, year-over-year comparable scoring instead of percentiles.

Top scorers

Rank	Province	Raw value (wet days/yr)	Score
1	Chon Buri	187.5	100
2	Chachoengsao	187.5	100
3	Phetchaburi	178.5	100
4	Samut Prakan	175.5	100
5	Bueng Kan	175.5	100

Lowest scorers

Rank	Province	Raw value (wet days/yr)	Score
77	Phuket	256.3	29.6
76	Trat	250.3	37.1
75	Chanthaburi	242.3	47.1
74	Satun	242.3	47.1
73	Rayong	242.3	47.1

Show all 77 provinces rankedSorted highest to lowest score

Rank	Province	Raw value (wet days/yr)	Score
1	Chon Buri	187.5	100
2	Chachoengsao	187.5	100
3	Phetchaburi	178.5	100
4	Samut Prakan	175.5	100
5	Bueng Kan	175.5	100
6	Nakhon Phanom	174.5	100
7	Kanchanaburi	172.5	100
8	Phayao	172.5	100
9	Bangkok	171.5	100
10	Nakhon Pathom	171.5	100
11	Nonthaburi	171.5	100
12	Nakhon Nayok	171.5	100
13	Pathum Thani	171.5	100
14	Prachin Buri	171.5	100
15	Chai Nat	171.5	100
16	Suphan Buri	171.5	100
17	Sing Buri	170.5	100
18	Lopburi	170.5	100
19	Nan	169.5	100
20	Sa Kaeo	168.5	100
21	Phichit	167.5	100
22	Chiang Rai	166.5	100
23	Mae Hong Son	166.5	100
24	Chiang Mai	164.5	100
25	Phra Nakhon Si Ayutthaya	164.5	100
26	Saraburi	164.5	100
27	Ang Thong	164.5	100
28	Uthai Thani	164.5	100
29	Nakhon Sawan	164.5	100
30	Phrae	163.6	100
31	Samut Songkhram	162.6	100
32	Samut Sakhon	162.6	100
33	Ratchaburi	162.6	100
34	Phitsanulok	161.6	100
35	Sukhothai	161.6	100
36	Lampang	160.6	100
37	Sakon Nakhon	160.6	100
38	Lamphun	159.6	100
39	Phetchabun	159.6	100
40	Buri Ram	158.6	100
41	Tak	157.6	100
42	Uttaradit	156.6	100
43	Kamphaeng Phet	156.6	100
44	Surin	155.6	100
45	Yasothon	154.6	100
46	Amnat Charoen	154.6	100
47	Nong Bua Lam Phu	154.6	100
48	Mukdahan	151.6	100
49	Si Sa Ket	151.6	100
50	Chaiyaphum	149.6	100
51	Roi Et	149.6	100
52	Maha Sarakham	148.6	100
53	Udon Thani	145.6	100
54	Kalasin	145.6	100
55	Ubon Ratchathani	144.6	100
56	Loei	142.6	100
57	Nakhon Ratchasima	141.6	100
58	Nong Khai	140.6	100
59	Khon Kaen	139.6	100
60	Prachuap Khiri Khan	219.4	75.8
61	Phangnga	222.4	72
62	Chumphon	222.4	72
63	Surat Thani	223.4	70.8
64	Ranong	224.4	69.5
65	Nakhon Si Thammarat	225.4	68.3
66	Pattani	227.4	65.8
67	Trang	230.4	62
68	Narathiwat	232.4	59.5
69	Krabi	233.4	58.3
70	Yala	234.4	57.1
71	Songkhla	236.4	54.6
72	Phatthalung	236.4	54.6
73	Rayong	242.3	47.1
74	Satun	242.3	47.1
75	Chanthaburi	242.3	47.1
76	Trat	250.3	37.1
77	Phuket	256.3	29.6

Methodology

See the methodology page for the full TLI scoring approach, including how this indicator's category Environment & Climate combines with the other six categories via geometric mean.

Cite as: "Wet Days Per Year (≥ 1 mm Rainfall)." Thailand Livability Index, 2026. CC BY-NC 4.0.

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