Total Cloud Cover Average Cloud Amount (%) June (1954 - 1997) , Ship Observations Only Global Average: 68.3 Zonal Averages 16 zones Lat.N Average 85 83.1 75 82.1 65 80.4 55 83.3 45 81.7 35 68.5 25 57.5 15 62.9 5 68.4 -5 56.3 -15 59.0 -25 62.0 -35 69.4 -45 77.6 -55 82.3 -65 73.4 Grid Box Averages 364 filled boxes Box # Lat.N Lon.E Average 1 85 60 86.6 2 85 180 83.1 3 85 300 78.3 4 75 20 84.0 5 75 60 82.3 6 75 100 78.3 7 75 140 88.5 8 75 180 85.0 9 75 220 79.3 10 75 260 72.6 11 75 300 68.7 12 75 340 86.6 13 65 10 78.6 14 65 30 75.1 15 65 50 71.7 20 65 150 67.3 21 65 170 79.5 22 65 190 82.5 23 65 210 78.6 26 65 270 81.3 27 65 290 74.9 28 65 310 81.1 29 65 330 83.8 30 65 350 82.5 31 55 10 65.0 32 55 30 53.6 37 55 130 72.3 38 55 150 77.8 39 55 170 89.0 40 55 190 91.0 41 55 210 88.0 42 55 230 84.4 45 55 290 71.7 46 55 310 83.4 47 55 330 86.9 48 55 350 75.8 49 45 5 42.6 50 45 15 36.8 51 45 25 42.1 52 45 35 42.7 53 45 45 51.6 54 45 55 45.5 61 45 125 69.3 62 45 135 74.5 63 45 145 79.9 64 45 155 90.8 65 45 165 95.1 66 45 175 95.6 67 45 185 94.4 68 45 195 92.5 69 45 205 91.6 70 45 215 90.2 71 45 225 86.4 72 45 235 73.3 77 45 285 58.4 78 45 295 66.4 79 45 305 73.6 80 45 315 80.3 81 45 325 80.1 82 45 335 80.8 83 45 345 75.5 84 45 355 63.4 85 35 5 39.6 86 35 15 28.9 87 35 25 19.6 88 35 35 22.6 89 35 45 57.0 90 35 55 41.3 96 35 115 56.2 97 35 125 71.4 98 35 135 77.5 99 35 145 80.8 100 35 155 84.3 101 35 165 85.5 102 35 175 81.8 103 35 185 81.3 104 35 195 79.6 105 35 205 76.2 106 35 215 78.3 107 35 225 78.4 108 35 235 66.0 109 35 245 70.0 112 35 275 55.2 113 35 285 59.7 114 35 295 64.2 115 35 305 63.2 116 35 315 59.5 117 35 325 61.3 118 35 335 67.2 119 35 345 66.2 120 35 355 40.4 124 25 35 9.6 125 25 45 16.5 126 25 55 16.6 127 25 65 47.8 128 25 75 57.7 129 25 85 76.7 130 25 95 72.9 131 25 105 59.0 132 25 115 68.2 133 25 125 69.3 134 25 135 67.2 135 25 145 55.8 136 25 155 54.6 137 25 165 55.0 138 25 175 55.4 139 25 185 52.8 140 25 195 52.1 141 25 205 56.5 142 25 215 69.0 143 25 225 79.8 144 25 235 81.3 145 25 245 59.8 146 25 255 44.8 147 25 265 48.5 148 25 275 51.9 149 25 285 58.8 150 25 295 56.8 151 25 305 50.9 152 25 315 48.5 153 25 325 50.7 154 25 335 58.6 155 25 345 45.7 160 15 35 23.2 161 15 45 32.5 162 15 55 46.5 163 15 65 68.0 164 15 75 79.1 165 15 85 75.5 166 15 95 79.8 167 15 105 67.2 168 15 115 67.6 169 15 125 62.7 170 15 135 59.5 171 15 145 54.9 172 15 155 54.5 173 15 165 55.5 174 15 175 57.2 175 15 185 56.2 176 15 195 56.0 177 15 205 58.9 178 15 215 66.6 179 15 225 73.3 180 15 235 75.4 181 15 245 70.0 182 15 255 62.2 183 15 265 71.1 184 15 275 67.6 185 15 285 62.0 186 15 295 55.0 187 15 305 59.1 188 15 315 61.9 189 15 325 68.8 190 15 335 66.2 191 15 345 48.7 193 5 5 76.0 197 5 45 50.5 198 5 55 52.0 199 5 65 67.1 200 5 75 71.6 201 5 85 69.8 202 5 95 76.1 203 5 105 70.3 204 5 115 70.0 205 5 125 71.2 206 5 135 74.3 207 5 145 68.8 208 5 155 67.9 209 5 165 65.5 210 5 175 67.8 211 5 185 66.7 212 5 195 66.8 213 5 205 63.5 214 5 215 65.0 215 5 225 63.5 216 5 235 65.5 217 5 245 66.3 218 5 255 70.3 219 5 265 75.4 220 5 275 81.6 221 5 285 81.0 222 5 295 69.4 223 5 305 70.1 224 5 315 65.4 225 5 325 60.9 226 5 335 68.7 227 5 345 73.8 228 5 355 73.0 229 -5 5 59.8 230 -5 15 48.0 232 -5 35 57.4 233 -5 45 53.7 234 -5 55 60.0 235 -5 65 64.0 236 -5 75 66.5 237 -5 85 67.7 238 -5 95 68.4 239 -5 105 62.5 240 -5 115 50.9 241 -5 125 53.0 242 -5 135 63.5 243 -5 145 66.6 244 -5 155 67.0 245 -5 165 60.5 246 -5 175 57.2 247 -5 185 54.8 248 -5 195 53.3 249 -5 205 47.6 250 -5 215 44.7 251 -5 225 45.2 252 -5 235 40.5 253 -5 245 43.6 254 -5 255 50.0 255 -5 265 62.9 256 -5 275 77.8 257 -5 285 80.9 260 -5 315 52.8 261 -5 325 55.6 262 -5 335 49.0 263 -5 345 44.6 264 -5 355 50.7 265 -15 5 71.5 266 -15 15 54.2 268 -15 35 41.4 269 -15 45 41.7 270 -15 55 56.2 271 -15 65 57.6 272 -15 75 61.6 273 -15 85 64.4 274 -15 95 68.6 275 -15 105 61.5 276 -15 115 41.4 277 -15 125 27.8 278 -15 135 49.1 279 -15 145 53.6 280 -15 155 62.1 281 -15 165 66.5 282 -15 175 63.1 283 -15 185 63.4 284 -15 195 58.8 285 -15 205 57.0 286 -15 215 54.8 287 -15 225 50.3 288 -15 235 49.6 289 -15 245 50.4 290 -15 255 57.7 291 -15 265 66.8 292 -15 275 84.2 293 -15 285 83.4 297 -15 325 55.3 298 -15 335 52.4 299 -15 345 56.7 300 -15 355 67.0 301 -25 5 66.3 302 -25 15 42.3 304 -25 35 40.7 305 -25 45 49.9 306 -25 55 55.5 307 -25 65 59.6 308 -25 75 62.9 309 -25 85 63.4 310 -25 95 65.1 311 -25 105 62.0 312 -25 115 50.4 315 -25 145 48.1 316 -25 155 53.0 317 -25 165 63.5 318 -25 175 68.4 319 -25 185 67.3 320 -25 195 65.2 321 -25 205 68.9 322 -25 215 68.0 323 -25 225 65.3 324 -25 235 59.6 325 -25 245 56.9 326 -25 255 62.8 327 -25 265 66.4 328 -25 275 70.9 329 -25 285 74.7 332 -25 315 55.7 333 -25 325 54.4 334 -25 335 61.5 335 -25 345 61.5 336 -25 355 65.2 337 -35 5 71.5 338 -35 15 54.2 339 -35 25 47.0 340 -35 35 48.0 341 -35 45 60.8 342 -35 55 66.3 343 -35 65 70.1 344 -35 75 71.2 345 -35 85 71.4 346 -35 95 71.3 347 -35 105 69.3 348 -35 115 66.3 349 -35 125 66.5 350 -35 135 70.0 351 -35 145 70.3 352 -35 155 61.3 353 -35 165 69.4 354 -35 175 67.1 355 -35 185 68.5 356 -35 195 71.9 357 -35 205 72.2 358 -35 215 73.4 359 -35 225 74.2 360 -35 235 76.5 361 -35 245 79.0 362 -35 255 77.0 363 -35 265 80.4 364 -35 275 77.7 365 -35 285 68.4 367 -35 305 64.4 368 -35 315 67.5 369 -35 325 70.5 370 -35 335 71.0 371 -35 345 75.0 372 -35 355 74.2 376 -45 35 78.9 377 -45 45 81.6 378 -45 55 80.9 379 -45 65 80.0 380 -45 75 79.2 381 -45 85 80.1 383 -45 105 75.0 384 -45 115 76.0 385 -45 125 74.0 386 -45 135 74.5 387 -45 145 67.4 388 -45 155 77.3 389 -45 165 78.3 390 -45 175 65.1 391 -45 185 79.0 392 -45 195 78.5 393 -45 205 79.3 394 -45 215 81.5 395 -45 225 84.5 396 -45 235 78.2 397 -45 245 84.2 398 -45 255 78.6 399 -45 265 82.3 400 -45 275 80.5 401 -45 285 80.8 402 -45 295 63.7 403 -45 305 68.0 404 -45 315 75.8 405 -45 325 78.0 406 -45 335 78.7 407 -45 345 78.8 408 -45 355 77.9 409 -55 10 77.9 411 -55 50 86.0 412 -55 70 87.9 417 -55 170 84.8 419 -55 210 81.5 420 -55 230 87.1 421 -55 250 85.1 422 -55 270 85.7 423 -55 290 75.2 424 -55 310 77.5 425 -55 330 75.2 434 -65 150 72.9 442 -65 310 73.8