Total Cloud Cover Average Cloud Amount (%) August (1954 - 1997) Day, Ship Observations Only Global Average: 67.6 Zonal Averages 16 zones Lat.N Average 85 87.4 75 83.3 65 79.3 55 81.2 45 76.2 35 56.7 25 56.9 15 64.3 5 67.3 -5 58.1 -15 59.6 -25 62.0 -35 69.2 -45 77.1 -55 83.3 -65 74.0 Grid Box Averages 360 filled boxes Box # Lat.N Lon.E Average 1 85 60 89.5 2 85 180 88.8 3 85 300 82.3 4 75 20 84.4 5 75 60 81.0 6 75 100 87.2 7 75 140 85.2 8 75 180 87.0 9 75 220 83.0 10 75 260 74.0 11 75 300 74.8 12 75 340 85.4 13 65 10 77.3 14 65 30 75.7 15 65 50 76.4 16 65 70 80.9 20 65 150 72.0 21 65 170 79.5 22 65 190 84.3 23 65 210 80.5 24 65 230 69.2 25 65 250 75.6 26 65 270 70.3 27 65 290 74.9 28 65 310 78.3 29 65 330 82.1 30 65 350 82.6 31 55 10 63.9 32 55 30 58.4 37 55 130 69.7 38 55 150 77.5 39 55 170 84.7 40 55 190 92.4 41 55 210 87.7 42 55 230 81.7 44 55 270 67.0 45 55 290 74.5 46 55 310 78.4 47 55 330 85.2 48 55 350 74.6 49 45 5 35.2 50 45 15 25.7 51 45 25 30.3 52 45 35 32.2 53 45 45 39.2 54 45 55 31.9 62 45 135 70.6 63 45 145 78.4 64 45 155 86.4 65 45 165 90.0 66 45 175 91.0 67 45 185 90.5 68 45 195 89.6 69 45 205 87.4 70 45 215 85.2 71 45 225 81.0 72 45 235 68.3 77 45 285 57.0 78 45 295 62.6 79 45 305 67.9 80 45 315 72.7 81 45 325 70.2 82 45 335 72.2 83 45 345 68.7 84 45 355 59.5 85 35 5 29.4 86 35 15 22.1 87 35 25 12.4 88 35 35 19.0 90 35 55 31.8 96 35 115 55.4 97 35 125 58.6 98 35 135 60.3 99 35 145 63.8 100 35 155 66.0 101 35 165 65.8 102 35 175 65.0 103 35 185 63.3 104 35 195 61.0 105 35 205 63.0 106 35 215 66.3 107 35 225 70.5 108 35 235 70.7 109 35 245 65.8 112 35 275 57.5 113 35 285 60.3 114 35 295 59.5 115 35 305 53.5 116 35 315 49.7 117 35 325 48.7 118 35 335 53.4 119 35 345 52.4 120 35 355 28.6 124 25 35 12.6 125 25 45 5.1 126 25 55 27.9 127 25 65 71.8 128 25 75 78.5 129 25 85 77.7 130 25 95 79.0 131 25 105 71.3 132 25 115 64.9 133 25 125 62.1 134 25 135 61.2 135 25 145 60.7 136 25 155 58.7 137 25 165 57.1 138 25 175 57.3 139 25 185 55.2 140 25 195 52.9 141 25 205 54.0 142 25 215 62.5 143 25 225 74.5 144 25 235 79.4 145 25 245 53.4 146 25 255 53.6 147 25 265 57.0 148 25 275 56.4 149 25 285 53.4 150 25 295 50.6 151 25 305 47.0 152 25 315 45.8 153 25 325 49.6 154 25 335 57.2 155 25 345 42.8 160 15 35 28.9 161 15 45 35.0 162 15 55 44.5 163 15 65 72.5 164 15 75 77.9 165 15 85 72.5 166 15 95 82.9 167 15 105 73.8 168 15 115 72.3 169 15 125 74.3 170 15 135 74.1 171 15 145 71.1 172 15 155 68.3 173 15 165 61.2 174 15 175 59.9 175 15 185 59.3 176 15 195 58.1 177 15 205 56.4 178 15 215 64.6 179 15 225 68.9 180 15 235 68.7 181 15 245 65.2 182 15 255 64.8 183 15 265 66.1 184 15 275 63.1 185 15 285 56.8 186 15 295 52.4 187 15 305 54.1 188 15 315 55.9 189 15 325 63.9 190 15 335 68.3 191 15 345 65.0 193 5 5 74.7 197 5 45 51.4 198 5 55 50.2 199 5 65 62.5 200 5 75 69.3 201 5 85 69.0 202 5 95 76.6 203 5 105 73.0 204 5 115 72.8 205 5 125 68.3 206 5 135 71.3 207 5 145 68.2 208 5 155 67.0 209 5 165 67.3 210 5 175 65.0 211 5 185 60.7 212 5 195 61.8 213 5 205 60.9 214 5 215 63.7 215 5 225 65.1 216 5 235 64.9 217 5 245 72.9 218 5 255 74.3 219 5 265 79.5 220 5 275 81.7 221 5 285 83.1 223 5 305 57.5 224 5 315 56.4 225 5 325 56.4 226 5 335 66.9 227 5 345 77.6 228 5 355 70.8 229 -5 5 72.1 230 -5 15 79.3 232 -5 35 55.0 233 -5 45 51.8 234 -5 55 62.1 235 -5 65 71.1 236 -5 75 69.8 237 -5 85 72.7 238 -5 95 71.5 239 -5 105 62.4 240 -5 115 46.5 241 -5 125 46.4 242 -5 135 58.3 243 -5 145 65.6 244 -5 155 68.5 245 -5 165 66.1 246 -5 175 59.3 247 -5 185 55.9 248 -5 195 50.1 249 -5 205 45.9 250 -5 215 42.8 251 -5 225 40.9 252 -5 235 41.5 253 -5 245 45.1 254 -5 255 54.6 255 -5 265 68.5 256 -5 275 82.8 257 -5 285 93.9 260 -5 315 47.5 261 -5 325 48.4 262 -5 335 45.6 263 -5 345 51.8 264 -5 355 61.5 265 -15 5 87.0 266 -15 15 77.3 268 -15 35 35.6 269 -15 45 40.3 270 -15 55 55.9 271 -15 65 57.0 272 -15 75 61.8 273 -15 85 67.1 274 -15 95 67.3 275 -15 105 57.5 276 -15 115 30.2 277 -15 125 24.0 278 -15 135 42.4 279 -15 145 49.4 280 -15 155 57.9 281 -15 165 63.3 282 -15 175 62.2 283 -15 185 62.4 284 -15 195 60.5 285 -15 205 54.8 286 -15 215 52.6 287 -15 225 48.2 288 -15 235 48.5 289 -15 245 51.5 290 -15 255 61.2 291 -15 265 72.5 292 -15 275 86.0 293 -15 285 87.1 297 -15 325 52.1 298 -15 335 54.1 299 -15 345 63.3 300 -15 355 83.2 301 -25 5 70.5 302 -25 15 54.0 304 -25 35 42.9 305 -25 45 46.0 306 -25 55 54.1 307 -25 65 59.2 308 -25 75 60.5 309 -25 85 66.4 310 -25 95 64.1 311 -25 105 63.5 312 -25 115 41.5 315 -25 145 36.9 316 -25 155 44.3 317 -25 165 55.6 318 -25 175 60.6 319 -25 185 64.0 320 -25 195 66.7 321 -25 205 69.1 322 -25 215 64.5 323 -25 225 63.8 324 -25 235 60.5 325 -25 245 58.8 326 -25 255 67.2 327 -25 265 71.8 328 -25 275 71.8 329 -25 285 75.5 332 -25 315 59.1 333 -25 325 57.2 334 -25 335 62.0 335 -25 345 63.7 336 -25 355 70.5 337 -35 5 73.2 338 -35 15 56.5 339 -35 25 51.9 340 -35 35 55.0 341 -35 45 64.3 342 -35 55 65.2 343 -35 65 66.0 344 -35 75 69.1 345 -35 85 73.0 346 -35 95 68.9 347 -35 105 71.8 348 -35 115 67.0 349 -35 125 65.4 350 -35 135 67.6 351 -35 145 64.6 352 -35 155 55.1 353 -35 165 64.3 354 -35 175 64.3 355 -35 185 67.1 356 -35 195 69.6 357 -35 205 70.8 358 -35 215 72.8 359 -35 225 74.2 360 -35 235 73.5 361 -35 245 77.8 362 -35 255 78.5 363 -35 265 77.6 364 -35 275 79.8 365 -35 285 71.8 367 -35 305 63.7 368 -35 315 69.3 369 -35 325 75.2 370 -35 335 72.5 371 -35 345 72.5 372 -35 355 72.3 376 -45 35 77.4 377 -45 45 78.5 378 -45 55 79.9 379 -45 65 81.9 380 -45 75 80.3 383 -45 105 75.4 385 -45 125 75.9 386 -45 135 77.0 387 -45 145 66.9 388 -45 155 69.3 389 -45 165 74.0 390 -45 175 69.9 391 -45 185 76.5 392 -45 195 78.2 393 -45 205 78.8 394 -45 215 81.7 395 -45 225 79.8 396 -45 235 84.0 397 -45 245 79.3 398 -45 255 77.3 399 -45 265 75.8 400 -45 275 82.0 401 -45 285 79.8 402 -45 295 64.1 403 -45 305 71.4 404 -45 315 77.1 405 -45 325 79.7 406 -45 335 83.0 408 -45 355 74.2 411 -55 50 85.2 412 -55 70 82.6 417 -55 170 83.8 419 -55 210 85.7 420 -55 230 86.7 421 -55 250 87.1 422 -55 270 83.2 423 -55 290 74.5 424 -55 310 80.7 425 -55 330 81.7 427 -65 10 74.0