Total Cloud Cover Average Cloud Amount (%) June, July, August (1954 - 1997) , Ship Observations Only Global Average: 68.2 Zonal Averages 17 zones Lat.N Average 85 84.6 75 82.7 65 79.9 55 82.9 45 80.1 35 63.0 25 57.3 15 64.0 5 68.0 -5 57.9 -15 60.1 -25 62.3 -35 69.1 -45 76.5 -55 81.5 -65 78.9 -75 55.4 Grid Box Averages 385 filled boxes Box # Lat.N Lon.E Average 1 85 60 87.0 2 85 180 86.4 3 85 300 78.5 4 75 20 84.5 5 75 60 81.3 6 75 100 84.9 7 75 140 86.5 8 75 180 84.8 9 75 220 80.1 10 75 260 75.1 11 75 300 72.8 12 75 340 87.0 13 65 10 79.9 14 65 30 75.5 15 65 50 74.6 16 65 70 79.1 20 65 150 70.2 21 65 170 81.1 22 65 190 83.8 23 65 210 78.8 24 65 230 69.3 25 65 250 74.7 26 65 270 69.3 27 65 290 72.8 28 65 310 79.9 29 65 330 83.6 30 65 350 84.4 31 55 10 65.0 32 55 30 54.9 37 55 130 72.1 38 55 150 79.6 39 55 170 88.2 40 55 190 92.5 41 55 210 88.8 42 55 230 84.2 44 55 270 64.0 45 55 290 72.8 46 55 310 81.4 47 55 330 87.6 48 55 350 76.9 49 45 5 35.5 50 45 15 29.0 51 45 25 33.2 52 45 35 34.9 53 45 45 44.0 54 45 55 39.6 61 45 125 64.5 62 45 135 73.5 63 45 145 81.3 64 45 155 90.3 65 45 165 94.1 66 45 175 94.7 67 45 185 94.0 68 45 195 92.3 69 45 205 91.1 70 45 215 89.8 71 45 225 85.8 72 45 235 70.5 77 45 285 58.6 78 45 295 65.2 79 45 305 71.2 80 45 315 77.3 81 45 325 77.0 82 45 335 78.4 83 45 345 73.8 84 45 355 61.9 85 35 5 33.1 86 35 15 21.8 87 35 25 14.0 88 35 35 20.1 89 35 45 51.3 90 35 55 36.2 96 35 115 56.9 97 35 125 65.3 98 35 135 67.4 99 35 145 73.5 100 35 155 77.7 101 35 165 76.9 102 35 175 72.9 103 35 185 71.9 104 35 195 70.8 105 35 205 71.5 106 35 215 74.5 107 35 225 77.2 108 35 235 70.3 109 35 245 69.0 112 35 275 55.0 113 35 285 59.3 114 35 295 61.2 115 35 305 57.4 116 35 315 52.8 117 35 325 54.4 118 35 335 61.9 119 35 345 61.8 120 35 355 34.8 124 25 35 11.5 125 25 45 10.4 126 25 55 25.0 127 25 65 64.3 128 25 75 70.2 129 25 85 77.7 130 25 95 78.2 131 25 105 64.6 132 25 115 63.3 133 25 125 61.6 134 25 135 61.3 135 25 145 58.1 136 25 155 56.9 137 25 165 55.7 138 25 175 55.1 139 25 185 53.4 140 25 195 53.0 141 25 205 56.2 142 25 215 68.2 143 25 225 79.7 144 25 235 82.5 145 25 245 57.3 146 25 255 50.5 147 25 265 51.4 148 25 275 52.6 149 25 285 54.8 150 25 295 52.4 151 25 305 47.5 152 25 315 46.9 153 25 325 51.3 154 25 335 60.2 155 25 345 47.2 156 25 355 45.3 160 15 35 30.4 161 15 45 38.7 162 15 55 45.0 163 15 65 72.0 164 15 75 79.6 165 15 85 75.4 166 15 95 81.8 167 15 105 69.9 168 15 115 68.8 169 15 125 67.1 170 15 135 67.2 171 15 145 63.6 172 15 155 61.2 173 15 165 57.8 174 15 175 58.0 175 15 185 57.6 176 15 195 57.2 177 15 205 58.0 178 15 215 66.5 179 15 225 72.8 180 15 235 74.5 181 15 245 67.2 182 15 255 64.9 183 15 265 68.7 184 15 275 65.1 185 15 285 59.0 186 15 295 53.4 187 15 305 56.1 188 15 315 59.4 189 15 325 67.3 190 15 335 68.0 191 15 345 58.2 193 5 5 77.0 197 5 45 51.2 198 5 55 49.8 199 5 65 63.1 200 5 75 70.2 201 5 85 69.5 202 5 95 77.0 203 5 105 70.7 204 5 115 70.3 205 5 125 70.0 206 5 135 73.0 207 5 145 68.5 208 5 155 67.8 209 5 165 66.3 210 5 175 66.5 211 5 185 65.2 212 5 195 64.1 213 5 205 62.1 214 5 215 64.9 215 5 225 64.4 216 5 235 65.8 217 5 245 71.8 218 5 255 74.3 219 5 265 78.8 220 5 275 81.8 221 5 285 81.3 222 5 295 68.1 223 5 305 62.6 224 5 315 60.7 225 5 325 58.0 226 5 335 67.5 227 5 345 75.6 228 5 355 72.4 229 -5 5 67.8 230 -5 15 62.5 232 -5 35 50.9 233 -5 45 53.7 234 -5 55 62.3 235 -5 65 67.5 236 -5 75 68.0 237 -5 85 69.8 238 -5 95 70.3 239 -5 105 60.8 240 -5 115 47.5 241 -5 125 49.5 242 -5 135 60.5 243 -5 145 67.0 244 -5 155 69.8 245 -5 165 65.0 246 -5 175 58.1 247 -5 185 55.0 248 -5 195 51.6 249 -5 205 47.1 250 -5 215 44.1 251 -5 225 43.7 252 -5 235 41.5 253 -5 245 45.0 254 -5 255 56.1 255 -5 265 69.3 256 -5 275 82.7 257 -5 285 84.2 260 -5 315 48.5 261 -5 325 52.8 262 -5 335 48.6 263 -5 345 47.3 264 -5 355 56.8 265 -15 5 80.4 266 -15 15 65.0 268 -15 35 37.6 269 -15 45 40.7 270 -15 55 57.3 271 -15 65 59.0 272 -15 75 63.0 273 -15 85 66.9 274 -15 95 68.6 275 -15 105 59.6 276 -15 115 35.0 277 -15 125 23.8 278 -15 135 45.8 279 -15 145 52.2 280 -15 155 61.9 281 -15 165 65.8 282 -15 175 64.7 283 -15 185 63.4 284 -15 195 59.3 285 -15 205 55.0 286 -15 215 53.4 287 -15 225 48.9 288 -15 235 50.4 289 -15 245 53.4 290 -15 255 61.5 291 -15 265 71.7 292 -15 275 86.3 293 -15 285 85.9 297 -15 325 54.0 298 -15 335 54.4 299 -15 345 61.3 300 -15 355 76.5 301 -25 5 69.4 302 -25 15 46.2 304 -25 35 41.0 305 -25 45 49.0 306 -25 55 54.7 307 -25 65 60.3 308 -25 75 62.5 309 -25 85 66.4 310 -25 95 66.1 311 -25 105 62.7 312 -25 115 44.4 315 -25 145 39.9 316 -25 155 48.1 317 -25 165 59.4 318 -25 175 64.7 319 -25 185 66.0 320 -25 195 66.4 321 -25 205 68.5 322 -25 215 66.7 323 -25 225 65.0 324 -25 235 61.0 325 -25 245 59.5 326 -25 255 64.5 327 -25 265 69.5 328 -25 275 71.6 329 -25 285 74.5 332 -25 315 56.4 333 -25 325 56.7 334 -25 335 61.9 335 -25 345 63.5 336 -25 355 69.0 337 -35 5 73.2 338 -35 15 53.7 339 -35 25 46.7 340 -35 35 49.8 341 -35 45 62.3 342 -35 55 65.6 343 -35 65 69.6 344 -35 75 70.6 345 -35 85 73.0 346 -35 95 71.3 347 -35 105 69.8 348 -35 115 65.9 349 -35 125 65.4 350 -35 135 68.3 351 -35 145 66.6 352 -35 155 58.1 353 -35 165 66.7 354 -35 175 64.8 355 -35 185 67.5 356 -35 195 69.8 357 -35 205 71.3 358 -35 215 73.5 359 -35 225 74.0 360 -35 235 75.7 361 -35 245 79.1 362 -35 255 78.4 363 -35 265 80.3 364 -35 275 77.2 365 -35 285 68.8 366 -35 295 54.5 367 -35 305 64.0 368 -35 315 67.5 369 -35 325 73.5 370 -35 335 72.2 371 -35 345 73.2 372 -35 355 73.9 373 -45 5 71.7 374 -45 15 71.7 375 -45 25 74.8 376 -45 35 78.3 377 -45 45 78.8 378 -45 55 79.1 379 -45 65 80.3 380 -45 75 77.4 381 -45 85 79.9 382 -45 95 74.4 383 -45 105 75.5 384 -45 115 77.2 385 -45 125 73.8 386 -45 135 75.8 387 -45 145 66.2 388 -45 155 73.7 389 -45 165 75.4 390 -45 175 66.5 391 -45 185 76.8 392 -45 195 78.2 393 -45 205 77.8 394 -45 215 79.9 395 -45 225 81.4 396 -45 235 79.5 397 -45 245 82.5 398 -45 255 78.9 399 -45 265 80.6 400 -45 275 80.8 401 -45 285 80.0 402 -45 295 64.5 403 -45 305 69.1 404 -45 315 75.6 405 -45 325 79.1 406 -45 335 79.0 407 -45 345 77.2 408 -45 355 75.0 409 -55 10 74.9 410 -55 30 78.0 411 -55 50 85.5 412 -55 70 84.5 415 -55 130 83.7 416 -55 150 80.5 417 -55 170 83.2 418 -55 190 82.1 419 -55 210 85.3 420 -55 230 85.1 421 -55 250 85.8 422 -55 270 83.2 423 -55 290 75.4 424 -55 310 78.0 425 -55 330 77.7 426 -55 350 79.7 427 -65 10 78.4 429 -65 50 79.8 434 -65 150 73.6 436 -65 190 83.0 437 -65 210 76.8 442 -65 310 77.7 444 -65 350 82.2 450 -75 220 55.4