Total Cloud Cover Average Cloud Amount (%) July (1954 - 1997) Day, Ship Observations Only Global Average: 68.2 Zonal Averages 16 zones Lat.N Average 85 81.9 75 80.9 65 79.5 55 83.4 45 79.8 35 61.2 25 57.2 15 64.9 5 67.9 -5 57.5 -15 59.4 -25 61.3 -35 68.8 -45 77.1 -55 83.2 -65 80.0 Grid Box Averages 359 filled boxes Box # Lat.N Lon.E Average 1 85 60 84.1 2 85 180 86.5 3 85 300 72.1 4 75 20 84.6 5 75 60 80.5 6 75 100 77.1 7 75 140 88.3 8 75 180 81.9 9 75 220 74.1 10 75 260 74.5 11 75 300 72.6 12 75 340 87.6 13 65 10 80.8 14 65 30 75.2 15 65 50 72.1 16 65 70 78.2 20 65 150 73.8 21 65 170 80.9 22 65 190 83.2 23 65 210 79.7 24 65 230 66.9 25 65 250 69.5 26 65 270 66.2 27 65 290 71.5 28 65 310 78.9 29 65 330 83.7 30 65 350 85.3 31 55 10 64.5 32 55 30 54.9 37 55 130 70.3 38 55 150 81.4 39 55 170 88.3 40 55 190 93.7 41 55 210 90.3 42 55 230 85.7 44 55 270 63.3 45 55 290 70.9 46 55 310 81.1 47 55 330 88.3 48 55 350 76.9 49 45 5 29.4 50 45 15 23.4 51 45 25 27.0 52 45 35 29.8 53 45 45 39.9 54 45 55 32.7 62 45 135 78.8 63 45 145 83.5 64 45 155 91.8 65 45 165 95.0 66 45 175 95.3 67 45 185 94.9 68 45 195 94.5 69 45 205 92.7 70 45 215 89.8 71 45 225 85.6 72 45 235 69.0 77 45 285 62.1 78 45 295 66.6 79 45 305 71.1 80 45 315 76.1 81 45 325 74.0 82 45 335 75.4 83 45 345 71.6 84 45 355 58.2 85 35 5 25.4 86 35 15 17.1 87 35 25 10.9 88 35 35 18.9 90 35 55 32.0 96 35 115 57.7 97 35 125 67.1 98 35 135 67.4 99 35 145 74.8 100 35 155 77.0 101 35 165 75.8 102 35 175 68.9 103 35 185 68.3 104 35 195 68.7 105 35 205 69.4 106 35 215 72.3 107 35 225 77.2 108 35 235 74.5 109 35 245 69.7 112 35 275 54.7 113 35 285 60.8 114 35 295 59.6 115 35 305 54.2 116 35 315 49.7 117 35 325 51.1 118 35 335 57.6 119 35 345 58.1 120 35 355 28.0 124 25 35 11.7 125 25 45 10.6 126 25 55 32.1 127 25 65 72.8 128 25 75 82.3 129 25 85 78.7 131 25 105 66.9 132 25 115 60.8 133 25 125 57.9 134 25 135 58.4 135 25 145 58.5 136 25 155 59.6 137 25 165 56.5 138 25 175 53.9 139 25 185 53.0 140 25 195 52.1 141 25 205 55.6 142 25 215 67.2 143 25 225 78.5 144 25 235 83.5 145 25 245 56.0 146 25 255 50.3 147 25 265 53.6 148 25 275 54.6 149 25 285 52.4 150 25 295 50.4 151 25 305 47.0 152 25 315 46.4 153 25 325 52.1 154 25 335 62.0 155 25 345 47.7 160 15 35 29.1 161 15 45 40.1 162 15 55 48.9 163 15 65 76.1 164 15 75 84.0 165 15 85 76.8 166 15 95 82.2 167 15 105 68.8 168 15 115 69.3 169 15 125 68.0 170 15 135 68.7 171 15 145 64.5 172 15 155 63.6 173 15 165 61.9 174 15 175 59.0 175 15 185 59.7 176 15 195 57.1 177 15 205 56.2 178 15 215 64.0 179 15 225 71.2 180 15 235 73.9 181 15 245 66.8 182 15 255 64.8 183 15 265 66.2 184 15 275 65.5 185 15 285 57.6 186 15 295 54.9 187 15 305 56.9 188 15 315 61.5 189 15 325 69.2 190 15 335 70.7 191 15 345 66.0 193 5 5 75.6 197 5 45 52.7 198 5 55 54.1 199 5 65 65.6 200 5 75 71.7 201 5 85 69.1 202 5 95 75.3 203 5 105 71.0 204 5 115 71.2 205 5 125 70.1 206 5 135 71.7 207 5 145 68.1 208 5 155 67.3 209 5 165 69.4 210 5 175 69.0 211 5 185 66.6 212 5 195 64.0 213 5 205 62.1 214 5 215 64.7 215 5 225 63.6 216 5 235 65.7 217 5 245 70.3 218 5 255 73.6 219 5 265 77.8 220 5 275 81.2 221 5 285 82.8 223 5 305 62.9 224 5 315 58.9 225 5 325 56.0 226 5 335 66.1 227 5 345 74.9 228 5 355 66.6 229 -5 5 62.8 230 -5 15 70.8 232 -5 35 55.3 233 -5 45 55.3 234 -5 55 62.7 235 -5 65 69.1 236 -5 75 69.2 237 -5 85 71.2 238 -5 95 72.1 239 -5 105 61.1 240 -5 115 51.3 241 -5 125 51.4 242 -5 135 62.0 243 -5 145 68.0 244 -5 155 71.3 245 -5 165 66.2 246 -5 175 60.4 247 -5 185 54.4 248 -5 195 50.8 249 -5 205 50.0 250 -5 215 43.8 251 -5 225 42.8 252 -5 235 40.7 253 -5 245 44.3 254 -5 255 52.1 255 -5 265 65.0 256 -5 275 80.3 257 -5 285 90.3 260 -5 315 49.7 261 -5 325 54.3 262 -5 335 47.3 263 -5 345 43.2 264 -5 355 48.9 265 -15 5 76.1 266 -15 15 70.0 268 -15 35 41.9 269 -15 45 45.9 270 -15 55 56.3 271 -15 65 58.9 272 -15 75 62.8 273 -15 85 67.7 274 -15 95 68.2 275 -15 105 60.0 276 -15 115 36.6 277 -15 125 29.1 278 -15 135 49.0 279 -15 145 52.5 280 -15 155 62.8 281 -15 165 65.2 282 -15 175 64.3 283 -15 185 63.3 284 -15 195 58.1 285 -15 205 52.1 286 -15 215 51.8 287 -15 225 48.1 288 -15 235 51.0 289 -15 245 52.9 290 -15 255 59.0 291 -15 265 69.2 292 -15 275 82.4 293 -15 285 87.7 297 -15 325 54.7 298 -15 335 53.4 299 -15 345 57.5 300 -15 355 70.5 301 -25 5 64.3 302 -25 15 46.2 304 -25 35 42.0 305 -25 45 50.0 306 -25 55 53.0 307 -25 65 58.5 308 -25 75 60.3 309 -25 85 64.2 310 -25 95 64.7 311 -25 105 64.6 312 -25 115 43.1 315 -25 145 43.7 316 -25 155 49.4 317 -25 165 57.6 318 -25 175 64.1 319 -25 185 64.5 320 -25 195 66.1 321 -25 205 66.6 322 -25 215 64.5 323 -25 225 65.0 324 -25 235 58.9 325 -25 245 61.1 326 -25 255 64.5 327 -25 265 66.6 328 -25 275 68.9 329 -25 285 73.3 332 -25 315 57.9 333 -25 325 58.0 334 -25 335 61.7 335 -25 345 61.5 336 -25 355 67.2 337 -35 5 71.3 338 -35 15 55.2 339 -35 25 46.4 340 -35 35 48.5 341 -35 45 59.5 342 -35 55 63.9 343 -35 65 67.0 344 -35 75 66.0 345 -35 85 69.6 346 -35 95 72.0 347 -35 105 70.7 348 -35 115 68.2 349 -35 125 67.0 350 -35 135 68.6 351 -35 145 64.2 352 -35 155 58.9 353 -35 165 67.5 354 -35 175 65.5 355 -35 185 65.7 356 -35 195 69.4 357 -35 205 72.2 358 -35 215 74.2 359 -35 225 74.0 360 -35 235 76.7 361 -35 245 78.1 362 -35 255 79.5 363 -35 265 78.1 364 -35 275 76.3 365 -35 285 71.6 367 -35 305 65.8 368 -35 315 68.3 369 -35 325 74.0 370 -35 335 72.7 371 -35 345 71.2 372 -35 355 72.5 374 -45 15 72.6 377 -45 45 75.2 378 -45 55 78.2 379 -45 65 82.6 380 -45 75 79.9 385 -45 125 75.4 386 -45 135 77.6 387 -45 145 67.3 388 -45 155 73.0 389 -45 165 75.5 390 -45 175 66.6 391 -45 185 78.1 392 -45 195 75.8 393 -45 205 76.5 394 -45 215 78.5 395 -45 225 79.6 396 -45 235 80.9 397 -45 245 84.8 398 -45 255 80.6 399 -45 265 84.4 400 -45 275 81.4 401 -45 285 79.2 402 -45 295 67.6 403 -45 305 73.7 404 -45 315 78.1 405 -45 325 81.3 406 -45 335 78.0 407 -45 345 77.4 408 -45 355 71.6 412 -55 70 85.1 416 -55 150 82.3 417 -55 170 83.7 419 -55 210 89.5 420 -55 230 83.4 421 -55 250 86.9 422 -55 270 82.3 423 -55 290 75.7 424 -55 310 79.8 425 -55 330 82.1 429 -65 50 80.0