Total Cloud Cover Average Cloud Amount (%) August (1954 - 1997) , Ship Observations Only Global Average: 68.1 Zonal Averages 16 zones Lat.N Average 85 87.2 75 83.9 65 79.9 55 81.7 45 77.2 35 57.2 25 56.8 15 64.2 5 67.7 -5 59.1 -15 60.8 -25 63.0 -35 69.2 -45 76.6 -55 81.9 -65 78.1 Grid Box Averages 371 filled boxes Box # Lat.N Lon.E Average 1 85 60 89.2 2 85 180 89.2 3 85 300 81.3 4 75 20 84.9 5 75 60 81.7 6 75 100 87.7 7 75 140 85.4 8 75 180 87.5 9 75 220 83.9 10 75 260 75.3 11 75 300 74.3 12 75 340 86.5 13 65 10 78.7 14 65 30 76.3 15 65 50 77.2 16 65 70 80.8 20 65 150 72.7 21 65 170 81.0 22 65 190 85.0 23 65 210 79.2 24 65 230 70.4 25 65 250 75.2 26 65 270 69.6 27 65 290 74.2 28 65 310 79.0 29 65 330 82.6 30 65 350 84.0 31 55 10 64.5 32 55 30 57.3 37 55 130 70.3 38 55 150 78.4 39 55 170 85.8 40 55 190 92.7 41 55 210 88.2 42 55 230 80.6 44 55 270 63.9 45 55 290 73.7 46 55 310 78.6 47 55 330 86.3 48 55 350 76.1 49 45 5 34.9 50 45 15 26.2 51 45 25 27.9 52 45 35 30.8 53 45 45 38.4 54 45 55 32.0 61 45 125 60.4 62 45 135 68.7 63 45 145 79.4 64 45 155 87.6 65 45 165 91.5 66 45 175 92.2 67 45 185 91.7 68 45 195 89.7 69 45 205 88.4 70 45 215 87.6 71 45 225 82.5 72 45 235 67.3 77 45 285 56.4 78 45 295 62.5 79 45 305 67.3 80 45 315 72.6 81 45 325 72.4 82 45 335 75.1 83 45 345 71.4 84 45 355 61.5 85 35 5 31.7 86 35 15 20.6 87 35 25 11.0 88 35 35 19.4 90 35 55 33.8 96 35 115 55.8 97 35 125 57.2 98 35 135 59.2 99 35 145 64.3 100 35 155 66.7 101 35 165 66.2 102 35 175 65.4 103 35 185 63.5 104 35 195 61.9 105 35 205 65.1 106 35 215 68.5 107 35 225 73.0 108 35 235 70.6 109 35 245 67.5 112 35 275 55.5 113 35 285 58.8 114 35 295 58.6 115 35 305 52.5 116 35 315 49.0 117 35 325 48.8 118 35 335 54.8 119 35 345 56.6 120 35 355 32.0 124 25 35 13.4 125 25 45 6.1 126 25 55 27.2 127 25 65 72.1 128 25 75 77.3 129 25 85 77.9 130 25 95 80.0 131 25 105 70.0 132 25 115 62.5 133 25 125 59.9 134 25 135 59.6 135 25 145 60.5 136 25 155 57.6 137 25 165 56.1 138 25 175 56.4 139 25 185 54.7 140 25 195 54.0 141 25 205 54.9 142 25 215 64.6 143 25 225 76.8 144 25 235 81.3 145 25 245 54.1 146 25 255 54.2 147 25 265 54.1 148 25 275 53.8 149 25 285 53.6 150 25 295 49.9 151 25 305 45.6 152 25 315 45.7 153 25 325 49.9 154 25 335 58.1 155 25 345 45.4 160 15 35 36.2 161 15 45 40.3 162 15 55 41.9 163 15 65 72.7 164 15 75 77.3 165 15 85 73.4 166 15 95 83.3 167 15 105 74.5 168 15 115 70.7 169 15 125 72.1 170 15 135 73.5 171 15 145 71.3 172 15 155 66.7 173 15 165 58.2 174 15 175 58.6 175 15 185 58.8 176 15 195 57.8 177 15 205 58.0 178 15 215 66.3 179 15 225 71.1 180 15 235 71.1 181 15 245 64.8 182 15 255 66.2 183 15 265 67.3 184 15 275 62.9 185 15 285 56.8 186 15 295 51.0 187 15 305 53.2 188 15 315 56.2 189 15 325 64.4 190 15 335 66.9 191 15 345 63.8 193 5 5 77.1 197 5 45 51.1 198 5 55 47.2 199 5 65 59.5 200 5 75 67.9 201 5 85 69.2 202 5 95 78.2 203 5 105 72.0 204 5 115 71.5 205 5 125 69.1 206 5 135 72.8 207 5 145 69.1 208 5 155 67.4 209 5 165 65.8 210 5 175 63.1 211 5 185 62.6 212 5 195 61.4 213 5 205 61.5 214 5 215 65.9 215 5 225 66.0 216 5 235 66.1 217 5 245 75.7 218 5 255 77.3 219 5 265 81.2 220 5 275 82.3 221 5 285 81.6 223 5 305 56.7 224 5 315 57.3 225 5 325 57.0 226 5 335 67.3 227 5 345 78.2 228 5 355 74.3 229 -5 5 76.3 230 -5 15 73.7 232 -5 35 51.4 233 -5 45 52.0 234 -5 55 63.7 235 -5 65 69.6 236 -5 75 68.5 237 -5 85 71.4 238 -5 95 70.9 239 -5 105 61.1 240 -5 115 44.5 241 -5 125 45.0 242 -5 135 56.9 243 -5 145 65.9 244 -5 155 69.9 245 -5 165 68.1 246 -5 175 58.2 247 -5 185 55.3 248 -5 195 49.9 249 -5 205 46.4 250 -5 215 44.7 251 -5 225 42.4 252 -5 235 42.1 253 -5 245 46.8 254 -5 255 60.8 255 -5 265 75.3 256 -5 275 85.5 257 -5 285 92.9 260 -5 315 44.2 261 -5 325 48.6 262 -5 335 48.3 263 -5 345 52.8 264 -5 355 65.9 265 -15 5 89.1 266 -15 15 75.5 268 -15 35 32.4 269 -15 45 36.5 270 -15 55 58.7 271 -15 65 58.6 272 -15 75 64.1 273 -15 85 67.8 274 -15 95 67.6 275 -15 105 57.9 276 -15 115 28.0 277 -15 125 19.5 278 -15 135 40.5 279 -15 145 49.7 280 -15 155 59.1 281 -15 165 64.3 282 -15 175 63.3 283 -15 185 63.0 284 -15 195 62.8 285 -15 205 56.0 286 -15 215 53.0 287 -15 225 47.2 288 -15 235 49.4 289 -15 245 55.9 290 -15 255 65.4 291 -15 265 75.1 292 -15 275 87.8 293 -15 285 87.4 297 -15 325 52.1 298 -15 335 56.9 299 -15 345 67.1 300 -15 355 86.5 301 -25 5 73.4 302 -25 15 51.5 304 -25 35 41.2 305 -25 45 46.7 306 -25 55 55.1 307 -25 65 61.1 308 -25 75 63.2 309 -25 85 68.0 310 -25 95 66.7 311 -25 105 63.0 312 -25 115 40.8 315 -25 145 35.5 316 -25 155 42.6 317 -25 165 56.3 318 -25 175 61.8 319 -25 185 65.8 320 -25 195 67.0 321 -25 205 70.0 322 -25 215 66.4 323 -25 225 64.1 324 -25 235 62.5 325 -25 245 60.6 326 -25 255 67.0 327 -25 265 73.2 328 -25 275 74.1 329 -25 285 75.2 332 -25 315 58.0 333 -25 325 57.5 334 -25 335 62.3 335 -25 345 64.9 336 -25 355 73.0 337 -35 5 74.2 338 -35 15 53.9 339 -35 25 50.0 340 -35 35 53.6 341 -35 45 65.9 342 -35 55 65.6 343 -35 65 69.3 344 -35 75 71.0 345 -35 85 75.2 346 -35 95 71.2 347 -35 105 71.5 348 -35 115 64.9 349 -35 125 64.1 350 -35 135 67.5 351 -35 145 64.8 352 -35 155 55.7 353 -35 165 64.4 354 -35 175 63.9 355 -35 185 67.3 356 -35 195 68.7 357 -35 205 70.7 358 -35 215 72.5 359 -35 225 74.7 360 -35 235 73.4 361 -35 245 78.8 362 -35 255 81.6 363 -35 265 78.7 364 -35 275 78.6 365 -35 285 69.3 366 -35 295 50.8 367 -35 305 61.8 368 -35 315 68.2 369 -35 325 74.0 370 -35 335 70.8 371 -35 345 72.1 372 -35 355 73.3 373 -45 5 73.0 374 -45 15 77.8 375 -45 25 76.0 376 -45 35 78.6 377 -45 45 77.7 378 -45 55 80.9 379 -45 65 81.1 380 -45 75 78.8 381 -45 85 79.8 382 -45 95 71.2 383 -45 105 77.2 384 -45 115 79.0 385 -45 125 75.9 386 -45 135 77.0 387 -45 145 65.2 388 -45 155 71.6 389 -45 165 72.9 390 -45 175 68.6 391 -45 185 75.7 392 -45 195 77.6 393 -45 205 79.1 394 -45 215 79.9 395 -45 225 80.2 396 -45 235 83.2 397 -45 245 78.8 398 -45 255 78.1 399 -45 265 75.4 400 -45 275 81.9 401 -45 285 79.7 402 -45 295 62.2 403 -45 305 67.5 404 -45 315 74.3 405 -45 325 79.4 406 -45 335 81.5 407 -45 345 76.2 408 -45 355 75.6 409 -55 10 74.9 411 -55 50 85.8 412 -55 70 82.8 417 -55 170 81.3 419 -55 210 86.7 420 -55 230 86.7 421 -55 250 87.0 422 -55 270 82.1 423 -55 290 75.1 424 -55 310 78.1 425 -55 330 79.5 427 -65 10 75.1 429 -65 50 82.3