Total Cloud Cover Average Cloud Amount (%) July (1954 - 1997) , Ship Observations Only Global Average: 68.3 Zonal Averages 16 zones Lat.N Average 85 82.1 75 81.0 65 80.1 55 84.2 45 81.0 35 62.3 25 57.5 15 64.9 5 67.8 -5 58.2 -15 60.6 -25 62.1 -35 68.7 -45 76.4 -55 82.1 -65 76.8 Grid Box Averages 367 filled boxes Box # Lat.N Lon.E Average 1 85 60 83.7 2 85 180 86.4 3 85 300 73.6 4 75 20 84.6 5 75 60 80.4 6 75 100 77.2 7 75 140 88.4 8 75 180 81.8 9 75 220 74.6 10 75 260 74.7 11 75 300 71.7 12 75 340 88.1 13 65 10 82.3 14 65 30 75.0 15 65 50 72.9 16 65 70 79.5 20 65 150 71.4 21 65 170 82.8 22 65 190 83.6 23 65 210 78.6 24 65 230 66.3 25 65 250 69.4 26 65 270 66.7 27 65 290 70.6 28 65 310 79.3 29 65 330 84.3 30 65 350 86.4 31 55 10 65.5 32 55 30 54.2 37 55 130 72.7 38 55 150 82.3 39 55 170 89.1 40 55 190 93.7 41 55 210 90.3 42 55 230 86.0 44 55 270 62.7 45 55 290 71.2 46 55 310 82.2 47 55 330 89.5 48 55 350 78.6 49 45 5 29.0 50 45 15 23.6 51 45 25 26.7 52 45 35 29.0 53 45 45 39.6 54 45 55 34.1 61 45 125 61.3 62 45 135 77.3 63 45 145 84.4 64 45 155 92.5 65 45 165 95.7 66 45 175 96.3 67 45 185 95.9 68 45 195 94.7 69 45 205 93.2 70 45 215 91.4 71 45 225 87.7 72 45 235 69.5 77 45 285 61.2 78 45 295 66.4 79 45 305 71.5 80 45 315 77.9 81 45 325 76.9 82 45 335 78.7 83 45 345 74.5 84 45 355 60.7 85 35 5 27.8 86 35 15 15.7 87 35 25 10.3 88 35 35 18.3 89 35 45 42.7 90 35 55 31.4 96 35 115 58.3 97 35 125 66.3 98 35 135 65.8 99 35 145 75.1 100 35 155 78.7 101 35 165 77.2 102 35 175 70.1 103 35 185 69.8 104 35 195 69.6 105 35 205 71.2 106 35 215 75.7 107 35 225 80.2 108 35 235 74.5 109 35 245 69.5 112 35 275 54.2 113 35 285 59.3 114 35 295 60.0 115 35 305 55.4 116 35 315 49.6 117 35 325 52.0 118 35 335 61.3 119 35 345 62.6 120 35 355 31.9 124 25 35 11.6 125 25 45 8.5 126 25 55 30.8 127 25 65 72.4 128 25 75 83.2 129 25 85 78.4 130 25 95 80.0 131 25 105 67.9 132 25 115 59.4 133 25 125 55.9 134 25 135 57.3 135 25 145 57.4 136 25 155 58.9 137 25 165 55.9 138 25 175 53.6 139 25 185 52.8 140 25 195 53.0 141 25 205 57.0 142 25 215 70.7 143 25 225 82.2 144 25 235 85.0 145 25 245 57.8 146 25 255 53.6 147 25 265 51.5 148 25 275 52.2 149 25 285 52.1 150 25 295 50.0 151 25 305 45.9 152 25 315 46.5 153 25 325 53.3 154 25 335 63.8 155 25 345 50.2 160 15 35 31.6 161 15 45 43.3 162 15 55 46.8 163 15 65 75.0 164 15 75 82.5 165 15 85 77.6 166 15 95 82.7 167 15 105 68.8 168 15 115 68.2 169 15 125 66.2 170 15 135 67.5 171 15 145 63.9 172 15 155 62.3 173 15 165 60.0 174 15 175 58.3 175 15 185 57.8 176 15 195 57.8 177 15 205 57.0 178 15 215 66.7 179 15 225 74.3 180 15 235 77.3 181 15 245 67.3 182 15 255 66.3 183 15 265 67.8 184 15 275 65.0 185 15 285 58.2 186 15 295 54.4 187 15 305 56.2 188 15 315 60.6 189 15 325 69.1 190 15 335 70.8 191 15 345 64.3 193 5 5 78.0 197 5 45 51.9 198 5 55 50.4 199 5 65 63.0 200 5 75 70.8 201 5 85 69.5 202 5 95 76.5 203 5 105 69.8 204 5 115 69.5 205 5 125 69.8 206 5 135 71.8 207 5 145 67.6 208 5 155 67.9 209 5 165 67.5 210 5 175 68.3 211 5 185 66.1 212 5 195 64.1 213 5 205 61.4 214 5 215 63.5 215 5 225 63.6 216 5 235 66.0 217 5 245 72.3 218 5 255 75.1 219 5 265 79.4 220 5 275 81.4 221 5 285 81.3 222 5 295 69.3 223 5 305 61.9 224 5 315 59.8 225 5 325 56.4 226 5 335 66.6 227 5 345 75.0 228 5 355 70.0 229 -5 5 66.3 230 -5 15 61.3 232 -5 35 53.9 233 -5 45 55.4 234 -5 55 63.0 235 -5 65 69.5 236 -5 75 69.2 237 -5 85 70.2 238 -5 95 71.4 239 -5 105 59.0 240 -5 115 47.5 241 -5 125 50.9 242 -5 135 61.0 243 -5 145 68.3 244 -5 155 72.5 245 -5 165 66.7 246 -5 175 58.8 247 -5 185 55.0 248 -5 195 51.6 249 -5 205 47.3 250 -5 215 43.1 251 -5 225 43.6 252 -5 235 41.9 253 -5 245 44.4 254 -5 255 57.2 255 -5 265 70.5 256 -5 275 83.7 257 -5 285 88.2 260 -5 315 48.7 261 -5 325 54.5 262 -5 335 48.6 263 -5 345 44.0 264 -5 355 53.8 265 -15 5 79.4 266 -15 15 67.7 268 -15 35 40.4 269 -15 45 44.2 270 -15 55 57.2 271 -15 65 60.8 272 -15 75 63.5 273 -15 85 68.5 274 -15 95 69.6 275 -15 105 59.7 276 -15 115 36.1 277 -15 125 24.6 278 -15 135 48.3 279 -15 145 53.4 280 -15 155 64.7 281 -15 165 67.0 282 -15 175 67.6 283 -15 185 63.9 284 -15 195 56.2 285 -15 205 51.7 286 -15 215 52.3 287 -15 225 49.3 288 -15 235 52.0 289 -15 245 54.3 290 -15 255 62.1 291 -15 265 75.1 292 -15 275 85.7 293 -15 285 86.4 297 -15 325 54.8 298 -15 335 53.9 299 -15 345 60.2 300 -15 355 74.9 301 -25 5 68.1 302 -25 15 44.4 304 -25 35 41.0 305 -25 45 50.4 306 -25 55 53.7 307 -25 65 60.1 308 -25 75 61.1 309 -25 85 67.5 310 -25 95 66.6 311 -25 105 63.0 312 -25 115 42.3 315 -25 145 41.6 316 -25 155 48.8 317 -25 165 58.4 318 -25 175 64.8 319 -25 185 65.0 320 -25 195 67.0 321 -25 205 66.7 322 -25 215 65.9 323 -25 225 65.5 324 -25 235 61.4 325 -25 245 61.9 326 -25 255 64.6 327 -25 265 67.5 328 -25 275 69.6 329 -25 285 73.4 332 -25 315 55.5 333 -25 325 58.2 334 -25 335 61.9 335 -25 345 64.0 336 -25 355 68.5 337 -35 5 73.8 338 -35 15 52.9 339 -35 25 43.0 340 -35 35 47.7 341 -35 45 60.3 342 -35 55 65.0 343 -35 65 69.4 344 -35 75 69.5 345 -35 85 72.3 346 -35 95 71.1 347 -35 105 68.6 348 -35 115 66.6 349 -35 125 65.7 350 -35 135 67.5 351 -35 145 65.0 352 -35 155 57.6 353 -35 165 66.3 354 -35 175 63.7 355 -35 185 66.9 356 -35 195 68.9 357 -35 205 71.0 358 -35 215 74.5 359 -35 225 73.1 360 -35 235 76.9 361 -35 245 77.3 362 -35 255 78.8 363 -35 265 78.8 364 -35 275 75.3 365 -35 285 68.7 366 -35 295 57.3 367 -35 305 65.6 368 -35 315 66.8 369 -35 325 75.5 370 -35 335 74.6 371 -35 345 72.3 372 -35 355 74.2 374 -45 15 73.6 376 -45 35 77.1 377 -45 45 77.3 378 -45 55 76.6 379 -45 65 81.9 380 -45 75 78.9 383 -45 105 74.0 384 -45 115 76.2 385 -45 125 74.3 386 -45 135 76.7 387 -45 145 65.9 388 -45 155 72.6 389 -45 165 75.5 390 -45 175 65.0 391 -45 185 76.6 392 -45 195 76.6 393 -45 205 75.8 394 -45 215 78.9 395 -45 225 78.8 396 -45 235 80.2 397 -45 245 81.8 398 -45 255 80.4 399 -45 265 84.4 400 -45 275 80.3 401 -45 285 79.5 402 -45 295 67.6 403 -45 305 72.4 404 -45 315 76.8 405 -45 325 81.6 406 -45 335 77.7 407 -45 345 75.6 408 -45 355 69.8 412 -55 70 84.6 416 -55 150 80.9 417 -55 170 83.6 419 -55 210 88.2 420 -55 230 81.6 421 -55 250 85.4 422 -55 270 82.2 423 -55 290 76.0 424 -55 310 78.3 425 -55 330 79.0 429 -65 50 76.8