Total Cloud Cover Average Cloud Amount (%) June, July, August (1954 - 1997) Day, Ship Observations Only Global Average: 68.0 Zonal Averages 16 zones Lat.N Average 85 84.6 75 82.3 65 79.3 55 82.2 45 78.9 35 61.9 25 57.0 15 63.9 5 67.8 -5 57.3 -15 59.0 -25 61.5 -35 69.1 -45 77.2 -55 82.2 -65 79.6 Grid Box Averages 382 filled boxes Box # Lat.N Lon.E Average 1 85 60 87.1 2 85 180 86.3 3 85 300 78.4 4 75 20 84.3 5 75 60 81.0 6 75 100 84.5 7 75 140 86.6 8 75 180 84.6 9 75 220 79.3 10 75 260 73.9 11 75 300 73.5 12 75 340 86.1 13 65 10 78.5 14 65 30 75.2 15 65 50 74.0 16 65 70 78.1 20 65 150 71.0 21 65 170 79.6 22 65 190 83.2 23 65 210 80.1 24 65 230 68.4 25 65 250 75.1 26 65 270 69.7 27 65 290 73.6 28 65 310 79.5 29 65 330 83.0 30 65 350 83.1 31 55 10 64.2 32 55 30 56.0 37 55 130 70.7 38 55 150 78.7 39 55 170 87.2 40 55 190 92.3 41 55 210 88.6 42 55 230 83.7 44 55 270 66.4 45 55 290 73.1 46 55 310 80.3 47 55 330 86.4 48 55 350 75.2 49 45 5 35.8 50 45 15 28.7 51 45 25 33.3 52 45 35 35.2 53 45 45 43.2 54 45 55 35.2 61 45 125 67.0 62 45 135 75.2 63 45 145 80.5 64 45 155 89.4 65 45 165 93.1 66 45 175 93.7 67 45 185 92.9 68 45 195 92.2 69 45 205 90.4 70 45 215 88.0 71 45 225 83.6 72 45 235 69.7 77 45 285 59.1 78 45 295 65.2 79 45 305 70.7 80 45 315 75.9 81 45 325 74.1 82 45 335 75.3 83 45 345 71.2 84 45 355 59.8 85 35 5 31.1 86 35 15 23.3 87 35 25 14.5 88 35 35 20.2 89 35 45 50.8 90 35 55 35.1 96 35 115 57.0 97 35 125 65.9 98 35 135 68.1 99 35 145 72.7 100 35 155 75.7 101 35 165 75.6 102 35 175 71.8 103 35 185 70.7 104 35 195 70.0 105 35 205 69.4 106 35 215 71.7 107 35 225 74.7 108 35 235 71.0 109 35 245 68.4 112 35 275 56.5 113 35 285 60.5 114 35 295 60.9 115 35 305 56.8 116 35 315 52.9 117 35 325 53.2 118 35 335 58.6 119 35 345 57.7 120 35 355 31.5 124 25 35 11.5 125 25 45 10.8 126 25 55 25.4 127 25 65 64.4 128 25 75 72.4 129 25 85 77.3 130 25 95 77.7 131 25 105 66.5 132 25 115 64.9 133 25 125 63.1 134 25 135 62.1 135 25 145 58.8 136 25 155 57.5 137 25 165 56.0 138 25 175 55.3 139 25 185 53.5 140 25 195 52.2 141 25 205 55.0 142 25 215 65.1 143 25 225 76.4 144 25 235 80.3 145 25 245 56.5 146 25 255 48.2 147 25 265 53.6 148 25 275 55.0 149 25 285 54.5 150 25 295 52.4 151 25 305 48.5 152 25 315 46.8 153 25 325 50.6 154 25 335 58.4 155 25 345 44.1 156 25 355 46.2 160 15 35 27.3 161 15 45 35.6 162 15 55 47.1 163 15 65 73.0 164 15 75 80.4 165 15 85 74.5 166 15 95 81.1 167 15 105 70.1 168 15 115 69.7 169 15 125 68.7 170 15 135 67.9 171 15 145 63.9 172 15 155 62.4 173 15 165 60.0 174 15 175 58.4 175 15 185 58.5 176 15 195 56.5 177 15 205 57.1 178 15 215 64.3 179 15 225 70.1 180 15 235 71.3 181 15 245 66.5 182 15 255 62.9 183 15 265 67.2 184 15 275 65.4 185 15 285 58.5 186 15 295 54.5 187 15 305 56.9 188 15 315 59.5 189 15 325 66.6 190 15 335 68.7 191 15 345 61.2 193 5 5 75.2 197 5 45 52.2 198 5 55 53.3 199 5 65 65.8 200 5 75 71.3 201 5 85 69.0 202 5 95 75.5 203 5 105 71.4 204 5 115 71.5 205 5 125 69.5 206 5 135 72.0 207 5 145 68.2 208 5 155 67.4 209 5 165 68.0 210 5 175 67.0 211 5 185 65.2 212 5 195 63.5 213 5 205 62.2 214 5 215 64.4 215 5 225 63.9 216 5 235 65.0 217 5 245 69.7 218 5 255 72.8 219 5 265 77.3 220 5 275 81.3 221 5 285 82.5 222 5 295 68.5 223 5 305 63.2 224 5 315 59.9 225 5 325 57.4 226 5 335 67.1 227 5 345 75.4 228 5 355 69.6 229 -5 5 64.2 230 -5 15 70.1 232 -5 35 56.2 233 -5 45 53.8 234 -5 55 62.0 235 -5 65 68.5 236 -5 75 68.8 237 -5 85 71.0 238 -5 95 71.0 239 -5 105 62.5 240 -5 115 50.3 241 -5 125 50.4 242 -5 135 61.1 243 -5 145 66.6 244 -5 155 68.9 245 -5 165 64.7 246 -5 175 59.5 247 -5 185 55.3 248 -5 195 51.4 249 -5 205 48.8 250 -5 215 44.2 251 -5 225 42.6 252 -5 235 40.9 253 -5 245 44.0 254 -5 255 51.0 255 -5 265 63.9 256 -5 275 79.5 257 -5 285 88.5 260 -5 315 50.2 261 -5 325 52.5 262 -5 335 47.0 263 -5 345 46.7 264 -5 355 52.6 265 -15 5 77.4 266 -15 15 68.5 268 -15 35 40.3 269 -15 45 43.5 270 -15 55 55.8 271 -15 65 57.4 272 -15 75 61.6 273 -15 85 65.8 274 -15 95 67.8 275 -15 105 59.7 276 -15 115 35.9 277 -15 125 28.3 278 -15 135 46.9 279 -15 145 51.8 280 -15 155 60.4 281 -15 165 64.5 282 -15 175 62.3 283 -15 185 63.0 284 -15 195 59.3 285 -15 205 54.5 286 -15 215 52.9 287 -15 225 49.0 288 -15 235 48.9 289 -15 245 51.4 290 -15 255 58.3 291 -15 265 69.0 292 -15 275 83.9 293 -15 285 86.6 297 -15 325 54.0 298 -15 335 52.8 299 -15 345 58.5 300 -15 355 72.4 301 -25 5 65.9 302 -25 15 48.0 304 -25 35 42.6 305 -25 45 48.8 306 -25 55 54.0 307 -25 65 58.4 308 -25 75 60.0 309 -25 85 63.9 310 -25 95 64.0 311 -25 105 63.7 312 -25 115 45.2 315 -25 145 42.7 316 -25 155 48.8 317 -25 165 58.3 318 -25 175 63.7 319 -25 185 64.7 320 -25 195 66.4 321 -25 205 67.8 322 -25 215 65.6 323 -25 225 65.1 324 -25 235 60.1 325 -25 245 59.4 326 -25 255 65.5 327 -25 265 67.3 328 -25 275 69.6 329 -25 285 74.3 332 -25 315 58.0 333 -25 325 57.0 334 -25 335 60.9 335 -25 345 61.8 336 -25 355 67.1 337 -35 5 71.4 338 -35 15 55.6 339 -35 25 49.1 340 -35 35 51.0 341 -35 45 61.6 342 -35 55 65.0 343 -35 65 67.0 344 -35 75 67.5 345 -35 85 70.9 346 -35 95 70.1 347 -35 105 70.7 348 -35 115 67.9 349 -35 125 66.8 350 -35 135 68.8 351 -35 145 65.9 352 -35 155 58.6 353 -35 165 67.2 354 -35 175 65.7 355 -35 185 67.4 356 -35 195 70.1 357 -35 205 71.3 358 -35 215 74.0 359 -35 225 73.5 360 -35 235 75.5 361 -35 245 78.0 362 -35 255 78.1 363 -35 265 78.8 364 -35 275 78.3 365 -35 285 71.7 366 -35 295 55.8 367 -35 305 65.7 368 -35 315 69.3 369 -35 325 74.1 370 -35 335 72.4 371 -35 345 71.9 372 -35 355 72.5 373 -45 5 74.4 374 -45 15 70.3 375 -45 25 74.9 376 -45 35 77.7 377 -45 45 79.6 378 -45 55 79.5 379 -45 65 81.7 380 -45 75 79.9 381 -45 85 80.4 382 -45 95 75.0 383 -45 105 76.1 384 -45 115 77.5 385 -45 125 75.8 386 -45 135 76.2 387 -45 145 68.4 388 -45 155 73.0 389 -45 165 76.0 390 -45 175 68.2 391 -45 185 77.5 392 -45 195 77.5 393 -45 205 78.0 394 -45 215 80.2 395 -45 225 81.7 396 -45 235 80.9 397 -45 245 84.2 398 -45 255 79.3 399 -45 265 81.8 400 -45 275 81.9 401 -45 285 79.7 402 -45 295 66.5 403 -45 305 71.6 404 -45 315 77.7 405 -45 325 79.8 406 -45 335 80.1 407 -45 345 77.2 408 -45 355 74.3 409 -55 10 76.4 410 -55 30 78.0 411 -55 50 86.1 412 -55 70 84.9 415 -55 130 84.1 416 -55 150 79.0 417 -55 170 84.5 418 -55 190 83.9 419 -55 210 85.5 420 -55 230 85.4 421 -55 250 86.5 422 -55 270 83.5 423 -55 290 75.7 424 -55 310 79.8 425 -55 330 81.2 426 -55 350 78.8 427 -65 10 78.7 429 -65 50 82.2 434 -65 150 76.9 442 -65 310 78.3 444 -65 350 81.9