Total Cloud Cover Average Cloud Amount (%) October (1954 - 1997) Night, Ship Observations Only Global Average: 68.4 Zonal Averages 16 zones Lat.N Average 85 75.9 75 81.9 65 81.3 55 78.3 45 73.6 35 64.0 25 54.6 15 57.6 5 65.6 -5 59.3 -15 62.2 -25 67.4 -35 72.2 -45 75.9 -55 83.2 -65 85.7 Grid Box Averages 333 filled boxes Box # Lat.N Lon.E Average 1 85 60 74.8 2 85 180 80.2 3 85 300 71.0 4 75 20 85.0 5 75 60 84.9 6 75 100 86.0 7 75 140 85.9 8 75 180 77.7 9 75 220 77.0 10 75 260 75.6 11 75 300 76.0 12 75 340 88.2 13 65 10 80.2 14 65 30 80.0 15 65 50 82.0 21 65 170 77.0 22 65 190 87.3 23 65 210 73.4 26 65 270 84.3 27 65 290 82.2 28 65 310 73.0 29 65 330 80.9 30 65 350 81.5 31 55 10 72.0 32 55 30 68.2 38 55 150 72.7 39 55 170 76.6 40 55 190 82.6 41 55 210 78.2 42 55 230 77.9 44 55 270 86.8 45 55 290 78.1 46 55 310 79.7 47 55 330 81.9 48 55 350 75.7 49 45 5 51.6 50 45 15 42.3 51 45 25 45.5 52 45 35 47.8 53 45 45 49.6 54 45 55 44.0 62 45 135 43.9 63 45 145 60.1 64 45 155 74.1 65 45 165 80.3 66 45 175 82.3 67 45 185 82.1 68 45 195 81.1 69 45 205 80.7 70 45 215 81.2 71 45 225 78.1 72 45 235 66.1 77 45 285 51.7 78 45 295 59.6 79 45 305 73.1 80 45 315 78.5 81 45 325 78.3 82 45 335 77.5 83 45 345 73.4 84 45 355 68.0 85 35 5 50.8 86 35 15 45.9 87 35 25 34.3 88 35 35 26.2 97 35 125 55.9 98 35 135 62.3 99 35 145 70.6 100 35 155 72.9 101 35 165 72.6 102 35 175 72.7 103 35 185 74.2 104 35 195 71.8 105 35 205 71.1 106 35 215 70.1 107 35 225 70.4 108 35 235 61.8 109 35 245 56.9 112 35 275 51.8 113 35 285 57.5 114 35 295 65.3 115 35 305 63.8 116 35 315 61.8 117 35 325 62.1 118 35 335 65.0 119 35 345 57.3 120 35 355 42.3 124 25 35 13.0 125 25 45 10.6 126 25 55 7.2 127 25 65 12.5 129 25 85 49.9 132 25 115 62.1 133 25 125 64.1 134 25 135 60.4 135 25 145 53.6 136 25 155 53.6 137 25 165 55.2 138 25 175 56.2 139 25 185 57.4 140 25 195 57.4 141 25 205 57.0 142 25 215 61.3 143 25 225 71.5 144 25 235 77.0 145 25 245 45.4 146 25 255 41.8 147 25 265 51.5 148 25 275 53.7 149 25 285 55.8 150 25 295 55.0 151 25 305 53.2 152 25 315 53.7 153 25 325 51.9 154 25 335 49.4 155 25 345 37.7 160 15 35 14.8 161 15 45 19.4 162 15 55 28.1 163 15 65 34.6 164 15 75 52.2 165 15 85 58.4 166 15 95 61.4 167 15 105 67.1 168 15 115 63.8 169 15 125 63.1 170 15 135 62.1 171 15 145 60.8 172 15 155 61.5 173 15 165 63.5 174 15 175 56.3 175 15 185 59.0 176 15 195 61.6 177 15 205 59.4 178 15 215 62.7 179 15 225 67.0 180 15 235 71.6 181 15 245 63.6 182 15 255 55.9 183 15 265 60.3 184 15 275 64.3 185 15 285 55.8 186 15 295 51.8 187 15 305 54.4 188 15 315 57.4 189 15 325 57.4 190 15 335 55.6 191 15 345 40.3 193 5 5 72.7 197 5 45 37.1 198 5 55 38.9 199 5 65 51.1 200 5 75 63.0 201 5 85 69.5 202 5 95 79.3 203 5 105 71.5 204 5 115 70.6 205 5 125 66.3 206 5 135 67.9 207 5 145 70.0 208 5 155 65.5 209 5 165 64.5 210 5 175 61.8 211 5 185 60.0 212 5 195 58.8 213 5 205 59.0 214 5 215 63.4 215 5 225 61.7 216 5 235 69.5 217 5 245 73.3 218 5 255 78.4 219 5 265 81.3 220 5 275 83.3 221 5 285 76.8 223 5 305 53.1 224 5 315 53.9 225 5 325 59.8 226 5 335 69.0 227 5 345 68.3 228 5 355 73.2 229 -5 5 83.0 230 -5 15 66.2 233 -5 45 43.0 234 -5 55 56.6 235 -5 65 64.4 236 -5 75 70.3 237 -5 85 71.4 238 -5 95 73.9 239 -5 105 70.2 240 -5 115 48.7 241 -5 125 40.3 242 -5 135 49.5 243 -5 145 67.7 244 -5 155 64.5 245 -5 165 63.3 246 -5 175 58.5 247 -5 185 55.7 248 -5 195 47.8 249 -5 205 42.1 250 -5 215 38.6 251 -5 225 36.9 252 -5 235 38.8 253 -5 245 48.9 254 -5 255 65.8 255 -5 265 81.6 256 -5 275 89.7 257 -5 285 77.6 260 -5 315 41.8 261 -5 325 43.2 262 -5 335 49.9 263 -5 345 68.2 264 -5 355 80.9 265 -15 5 92.3 266 -15 15 68.3 268 -15 35 34.7 269 -15 45 33.3 270 -15 55 56.9 271 -15 65 60.6 272 -15 75 67.0 273 -15 85 68.2 274 -15 95 64.5 275 -15 105 51.6 276 -15 115 23.5 277 -15 125 23.9 278 -15 135 34.7 279 -15 145 48.2 280 -15 155 56.1 281 -15 165 63.9 282 -15 175 66.5 283 -15 185 65.5 284 -15 195 62.9 285 -15 205 61.7 286 -15 215 58.3 287 -15 225 50.1 288 -15 235 49.8 289 -15 245 57.8 290 -15 255 71.5 291 -15 265 82.2 292 -15 275 90.1 293 -15 285 82.7 297 -15 325 54.1 298 -15 335 58.3 299 -15 345 76.9 300 -15 355 92.5 301 -25 5 81.6 302 -25 15 57.5 304 -25 35 56.7 305 -25 45 58.2 306 -25 55 56.4 307 -25 65 62.9 308 -25 75 69.4 309 -25 85 71.1 310 -25 95 73.2 311 -25 105 67.7 312 -25 115 36.3 316 -25 155 47.1 317 -25 165 58.8 318 -25 175 64.8 319 -25 185 66.9 320 -25 195 71.1 321 -25 205 71.1 322 -25 215 73.2 323 -25 225 70.8 324 -25 235 64.5 325 -25 245 56.7 326 -25 255 69.7 327 -25 265 73.7 328 -25 275 77.1 329 -25 285 77.4 332 -25 315 70.5 333 -25 325 67.1 334 -25 335 69.2 335 -25 345 72.4 336 -25 355 77.7 337 -35 5 78.4 338 -35 15 59.5 339 -35 25 63.7 340 -35 35 73.3 341 -35 45 70.9 342 -35 55 69.6 343 -35 65 75.4 344 -35 75 79.1 345 -35 85 80.0 346 -35 95 76.3 347 -35 105 78.1 348 -35 115 61.1 349 -35 125 64.8 350 -35 135 65.9 351 -35 145 61.0 352 -35 155 61.4 353 -35 165 70.9 354 -35 175 67.3 355 -35 185 69.3 356 -35 195 72.6 357 -35 205 75.5 358 -35 215 76.1 359 -35 225 77.3 363 -35 265 82.4 364 -35 275 75.7 365 -35 285 70.7 367 -35 305 57.1 368 -35 315 63.5 369 -35 325 71.8 370 -35 335 74.1 371 -35 345 77.6 372 -35 355 78.5 379 -45 65 81.0 380 -45 75 78.7 383 -45 105 79.8 387 -45 145 62.0 388 -45 155 73.3 389 -45 165 79.2 390 -45 175 65.3 391 -45 185 77.2 392 -45 195 81.7 393 -45 205 83.6 400 -45 275 83.1 401 -45 285 76.3 402 -45 295 63.3 403 -45 305 62.9 404 -45 315 75.0 408 -45 355 84.2 414 -55 110 83.8 416 -55 150 83.4 417 -55 170 87.0 421 -55 250 88.3 422 -55 270 84.6 423 -55 290 77.6 424 -55 310 80.2 425 -55 330 79.4 430 -65 70 85.8 432 -65 110 83.0 433 -65 130 81.8 442 -65 310 89.9