8% : between 600 and 1460 days
28%: between 250 and 400 days
9.6% : between 1095 and 1500 days
8% : Chance of a False Spring, lasting between 45 and 200 days
28% : between 364 and 634 days
9.6% : between 99 and 1200
8% : between 800 and 1100
0.8% : between 1825 and 3650 (Very long, based on the 10 year summer in canon, very rare chance for that to happen)

16.13% : between 600 & 1460 days
16.13% between 250 & 400 days
9.68% : between 1095 & 2190 days
8% : between 45 & 200 days (False Summer)
20.2% : between 364 & 634 days
9.68 % : between 99 & 1200 days
8% : between 800 & 1100 days
12.1% : between 1825 & 3650 days

10% : between 600 & 1460 days
40% : between 250 & 400 days
5% : between 1095 & 2190 days
15% : between 45 & 200 days (False Autumn)
20% : between 364 & 634 days
5% : between 99 & 1200 days
4% : between 800 & 1100 days
1% : between 1825 & 3650 days


10.4% : between 600 & 1460 days
17.4% : between 250 & 400 days
6.25% : between 1095 & 2190 days
8.3% : between 45 & 200 days (False Winter)
24.3% : between 364 & 634 days
10.4% : between 99 & 1200 days
16% : between 800 & 1100 days
7% : between 1825 & 3650 days



Don't scroll if you want to keep historical seasons a mystery




Year Season*
1 SUMMER
2 SUMMER
3 AUTUMN
4 AUTUMN
5 WINTER
6 SPRING
7 SUMMER
8 SUMMER
9 SUMMER
10 AUTUMN
11 WINTER
12 WINTER
13 WINTER
14 SPRING
15 SPRING
16 SUMMER
17 SUMMER
18 AUTUMN
19 AUTUMN
20 WINTER
21 WINTER
22 SPRING
23 SUMMER
24 AUTUMN
25 WINTER
26 SPRING
27 SUMMER
28 AUTUMN
29 AUTUMN
30 AUTUMN
31 WINTER
32 WINTER
33 SPRING
34 SUMMER
35 AUTUMN
36 WINTER
37 WINTER
38 SPRING
39 SPRING
40 SUMMER
41 SUMMER
42 SUMMER
43 AUTUMN
44 WINTER
45 WINTER
46 SPRING
47 SPRING
48 SPRING
49 SUMMER
50 SUMMER
51 SUMMER
52 SUMMER
53 SUMMER
54 AUTUMN
55 AUTUMN
56 WINTER
57 SPRING
58 AUTUMN
59 WINTER
60 WINTER
61 SPRING
62 SUMMER
63 SUMMER
64 AUTUMN
65 AUTUMN
66 AUTUMN
67 WINTER
68 WINTER
69 SPRING
70 SPRING
71 SUMMER
72 SUMMER
73 AUTUMN
74 WINTER
75 WINTER
76 SPRING
77 SUMMER
78 SUMMER
79 AUTUMN
80 WINTER
81 WINTER
82 WINTER
83 SPRING
84 SPRING
85 SPRING
86 SUMMER
87 SUMMER
88 AUTUMN
89 WINTER
90 WINTER
91 SPRING
92 SUMMER
93 SUMMER
94 AUTUMN
95 AUTUMN
96 WINTER
97 WINTER
98 SPRING
99 SUMMER
100 SUMMER
101 AUTUMN
102 WINTER
103 WINTER
104 SPRING
105 SUMMER
106 SUMMER
107 AUTUMN
108 WINTER
109 WINTER
110 WINTER
111 SPRING
112 SUMMER
113 SUMMER
114 SUMMER
115 AUTUMN
116 WINTER
117 WINTER
118 WINTER
119 SPRING
120 SPRING
121 SUMMER
122 SUMMER
123 AUTUMN
124 WINTER
125 WINTER
126 SPRING
127 SUMMER
128 SUMMER
129 AUTUMN
130 AUTUMN
131 WINTER
132 WINTER
133 WINTER
134 WINTER
135 SPRING
136 SPRING
137 SUMMER
138 SUMMER
139 SUMMER
140 SUMMER
141 SUMMER
142 AUTUMN
143 AUTUMN
144 WINTER
145 AUTUMN
146 WINTER
147 WINTER
148 SPRING
149 SUMMER
150 AUTUMN
151 WINTER
152 SPRING
153 SUMMER
154 AUTUMN
155 SUMMER
156 SUMMER
157 AUTUMN
158 WINTER
159 WINTER
160 SPRING
161 WINTER
162 SPRING
163 SUMMER
164 SUMMER
165 SUMMER
166 AUTUMN
167 AUTUMN
168 WINTER
169 WINTER
170 SPRING
171 SUMMER
172 AUTUMN
173 WINTER
174 SPRING
175 SPRING
176 SUMMER
177 SUMMER
178 SUMMER
179 AUTUMN
180 WINTER
181 WINTER
182 WINTER
183 SPRING
184 SUMMER
185 SUMMER
186 SUMMER
187 SUMMER
188 AUTUMN
189 AUTUMN
190 WINTER
191 WINTER
192 SPRING
193 SUMMER
194 SUMMER
195 AUTUMN
196 WINTER
197 SPRING
198 SUMMER
199 AUTUMN
200 WINTER
201 WINTER
202 SPRING
203 SUMMER
204 SUMMER
205 SUMMER
206 AUTUMN
207 WINTER
208 SPRING
209 SPRING
210 SPRING
211 SUMMER
212 SUMMER
213 AUTUMN
214 WINTER
215 WINTER
216 WINTER
217 SPRING
218 SUMMER
219 SUMMER
220 SUMMER
221 AUTUMN
222 WINTER
223 SPRING
224 SUMMER
225 SUMMER
226 SUMMER
227 SUMMER
228 SUMMER
229 SUMMER
230 SUMMER
231 AUTUMN
232 WINTER
233 WINTER
234 WINTER
235 WINTER
236 WINTER
237 SPRING
238 SPRING
239 SUMMER
240 SUMMER
241 AUTUMN
242 WINTER
243 WINTER
244 SPRING
245 SUMMER
246 SUMMER
247 AUTUMN
248 WINTER
249 SPRING
250 SUMMER
251 SUMMER
252 SUMMER
253 AUTUMN
254 AUTUMN
255 WINTER
256 WINTER
257 WINTER
258 SPRING
259 SPRING
260 SUMMER
261 SUMMER
262 SUMMER
263 SUMMER
264 SUMMER
265 AUTUMN
266 WINTER
267 WINTER
268 WINTER
269 SPRING
270 SUMMER
271 AUTUMN
272 WINTER
273 WINTER
274 WINTER
275 SPRING
276 SUMMER
277 SUMMER
278 AUTUMN
279 WINTER
280 WINTER
281 SPRING
282 WINTER
283 SPRING
284 SUMMER
285 SUMMER
286 AUTUMN
287 WINTER
288 SPRING
289 SUMMER
290 SUMMER
291 SUMMER
292 SUMMER
293 SUMMER
294 SUMMER
295 SUMMER
296 SUMMER
297 SUMMER
298 SUMMER
299 AUTUMN
300 WINTER
301 WINTER
Winter usually ends in 303 or 304 AC

*Data is from the ASOIAF Wiki, for years where a canon season isn't recorded I did what seemed reassonable both for gameplay balance, RP Balance, and basing lengths on existing data.