Total Cloud Cover Average Cloud Amount (%) June, July, August (1954 - 1997) Night, Ship Observations Only Global Average: 68.1 Zonal Averages 15 zones Lat.N Average 85 84.6 75 83.0 65 80.5 55 83.6 45 81.4 35 64.1 25 57.6 15 64.0 5 68.1 -5 58.4 -15 61.1 -25 63.2 -35 69.2 -45 76.0 -55 80.4 Grid Box Averages 359 filled boxes Box # Lat.N Lon.E Average 1 85 60 86.8 2 85 180 86.5 3 85 300 78.6 4 75 20 84.8 5 75 60 81.6 6 75 100 85.4 7 75 140 86.4 8 75 180 85.0 9 75 220 80.9 10 75 260 76.2 11 75 300 72.2 12 75 340 87.9 13 65 10 81.3 14 65 30 75.8 15 65 50 75.2 16 65 70 80.0 20 65 150 69.5 21 65 170 82.7 22 65 190 84.3 23 65 210 77.5 24 65 230 70.1 25 65 250 74.2 26 65 270 68.8 27 65 290 72.0 28 65 310 80.2 29 65 330 84.2 30 65 350 85.7 31 55 10 65.8 32 55 30 53.8 37 55 130 73.5 38 55 150 80.5 39 55 170 89.1 40 55 190 92.6 41 55 210 89.1 42 55 230 84.7 44 55 270 61.6 45 55 290 72.5 46 55 310 82.4 47 55 330 88.8 48 55 350 78.5 49 45 5 35.1 50 45 15 29.2 51 45 25 33.1 52 45 35 34.6 53 45 45 44.8 54 45 55 44.0 62 45 135 71.8 63 45 145 82.1 64 45 155 91.3 65 45 165 95.1 66 45 175 95.7 67 45 185 95.1 68 45 195 92.3 69 45 205 91.8 70 45 215 91.7 71 45 225 87.9 72 45 235 71.3 77 45 285 58.2 78 45 295 65.2 79 45 305 71.7 80 45 315 78.7 81 45 325 79.8 82 45 335 81.5 83 45 345 76.4 84 45 355 64.0 85 35 5 35.0 86 35 15 20.3 87 35 25 13.4 88 35 35 20.0 89 35 45 53.3 90 35 55 44.0 96 35 115 56.7 97 35 125 64.7 98 35 135 66.6 99 35 145 74.3 100 35 155 79.7 101 35 165 78.3 102 35 175 74.1 103 35 185 73.1 104 35 195 71.6 105 35 205 73.5 106 35 215 77.3 107 35 225 79.8 108 35 235 69.6 109 35 245 69.5 112 35 275 53.6 113 35 285 58.0 114 35 295 61.5 115 35 305 58.0 116 35 315 52.7 117 35 325 55.5 118 35 335 65.2 119 35 345 66.0 120 35 355 38.1 124 25 35 11.6 125 25 45 10.1 126 25 55 24.5 127 25 65 64.2 128 25 75 68.0 129 25 85 78.0 130 25 95 78.6 131 25 105 62.7 132 25 115 61.7 133 25 125 60.0 134 25 135 60.4 135 25 145 57.4 136 25 155 56.3 137 25 165 55.3 138 25 175 55.0 139 25 185 53.4 140 25 195 53.8 141 25 205 57.3 142 25 215 71.2 143 25 225 82.9 144 25 235 84.7 145 25 245 58.0 146 25 255 52.9 147 25 265 49.3 148 25 275 50.3 149 25 285 55.1 150 25 295 52.3 151 25 305 46.5 152 25 315 47.0 153 25 325 52.0 154 25 335 62.0 155 25 345 50.3 160 15 35 33.4 161 15 45 41.8 162 15 55 42.8 163 15 65 70.9 164 15 75 78.8 165 15 85 76.4 166 15 95 82.6 167 15 105 69.7 168 15 115 68.0 169 15 125 65.6 170 15 135 66.5 171 15 145 63.3 172 15 155 60.1 173 15 165 55.5 174 15 175 57.6 175 15 185 56.8 176 15 195 57.9 177 15 205 59.0 178 15 215 68.7 179 15 225 75.5 180 15 235 77.6 181 15 245 67.9 182 15 255 66.8 183 15 265 70.2 184 15 275 64.8 185 15 285 59.5 186 15 295 52.4 187 15 305 55.4 188 15 315 59.3 189 15 325 68.0 190 15 335 67.3 191 15 345 55.1 193 5 5 78.9 197 5 45 50.2 198 5 55 46.4 199 5 65 60.5 200 5 75 69.0 201 5 85 70.0 202 5 95 78.4 203 5 105 69.9 204 5 115 69.2 205 5 125 70.5 206 5 135 74.0 207 5 145 68.8 208 5 155 68.1 209 5 165 64.7 210 5 175 65.9 211 5 185 65.1 212 5 195 64.7 213 5 205 62.0 214 5 215 65.3 215 5 225 64.9 216 5 235 66.8 217 5 245 73.9 218 5 255 75.8 219 5 265 80.3 220 5 275 82.2 221 5 285 80.0 223 5 305 62.0 224 5 315 61.5 225 5 325 58.6 226 5 335 67.9 227 5 345 75.8 228 5 355 75.2 229 -5 5 71.3 230 -5 15 55.0 232 -5 35 45.6 233 -5 45 53.6 234 -5 55 62.5 235 -5 65 66.6 236 -5 75 67.3 237 -5 85 68.6 238 -5 95 69.6 239 -5 105 59.1 240 -5 115 44.8 241 -5 125 48.7 242 -5 135 59.8 243 -5 145 67.3 244 -5 155 70.7 245 -5 165 65.4 246 -5 175 56.7 247 -5 185 54.8 248 -5 195 51.8 249 -5 205 45.5 250 -5 215 44.0 251 -5 225 44.7 252 -5 235 42.1 253 -5 245 46.0 254 -5 255 61.2 255 -5 265 74.6 256 -5 275 85.9 257 -5 285 79.9 260 -5 315 46.7 261 -5 325 53.1 262 -5 335 50.2 263 -5 345 47.9 264 -5 355 61.0 265 -15 5 83.4 266 -15 15 61.6 268 -15 35 34.9 269 -15 45 38.0 270 -15 55 58.8 271 -15 65 60.7 272 -15 75 64.5 273 -15 85 68.0 274 -15 95 69.4 275 -15 105 59.6 276 -15 115 34.2 277 -15 125 19.3 278 -15 135 44.8 279 -15 145 52.7 280 -15 155 63.4 281 -15 165 67.1 282 -15 175 67.1 283 -15 185 63.9 284 -15 195 59.3 285 -15 205 55.4 286 -15 215 53.9 287 -15 225 48.7 288 -15 235 51.8 289 -15 245 55.5 290 -15 255 64.7 291 -15 265 74.4 292 -15 275 88.7 293 -15 285 85.3 297 -15 325 54.1 298 -15 335 55.9 299 -15 345 64.1 300 -15 355 80.5 301 -25 5 72.8 302 -25 15 44.4 304 -25 35 39.3 305 -25 45 49.1 306 -25 55 55.5 307 -25 65 62.1 308 -25 75 65.0 309 -25 85 68.9 310 -25 95 68.3 311 -25 105 61.7 312 -25 115 43.6 315 -25 145 37.0 316 -25 155 47.5 317 -25 165 60.4 318 -25 175 65.7 319 -25 185 67.3 320 -25 195 66.4 321 -25 205 69.2 322 -25 215 67.9 323 -25 225 65.0 324 -25 235 61.9 325 -25 245 59.6 326 -25 255 63.5 327 -25 265 71.7 328 -25 275 73.6 329 -25 285 74.6 332 -25 315 54.8 333 -25 325 56.5 334 -25 335 62.8 335 -25 345 65.2 336 -25 355 70.9 337 -35 5 75.0 338 -35 15 51.8 339 -35 25 44.3 340 -35 35 48.5 341 -35 45 63.1 342 -35 55 66.3 343 -35 65 72.2 344 -35 75 73.6 345 -35 85 75.1 346 -35 95 72.4 347 -35 105 68.8 348 -35 115 64.0 349 -35 125 63.9 350 -35 135 67.9 351 -35 145 67.3 352 -35 155 57.5 353 -35 165 66.2 354 -35 175 63.9 355 -35 185 67.7 356 -35 195 69.4 357 -35 205 71.2 358 -35 215 73.0 359 -35 225 74.5 360 -35 235 75.9 361 -35 245 80.2 362 -35 255 80.2 363 -35 265 81.7 364 -35 275 76.1 365 -35 285 66.0 367 -35 305 62.3 368 -35 315 65.7 369 -35 325 73.0 370 -35 335 72.0 371 -35 345 74.4 372 -35 355 75.3 376 -45 35 80.6 377 -45 45 78.0 378 -45 55 78.7 379 -45 65 78.8 380 -45 75 75.0 385 -45 125 71.8 386 -45 135 75.3 387 -45 145 64.1 388 -45 155 74.3 389 -45 165 74.9 390 -45 175 64.8 391 -45 185 76.1 392 -45 195 79.0 393 -45 205 77.5 394 -45 215 79.6 395 -45 225 81.1 396 -45 235 78.2 397 -45 245 80.8 398 -45 255 78.5 399 -45 265 79.3 400 -45 275 79.7 401 -45 285 80.3 402 -45 295 62.5 403 -45 305 66.6 404 -45 315 73.5 405 -45 325 78.4 406 -45 335 74.0 407 -45 345 77.2 408 -45 355 77.5 411 -55 50 82.0 412 -55 70 84.1 417 -55 170 81.8 420 -55 230 83.8 421 -55 250 82.5 422 -55 270 82.9 423 -55 290 75.1 424 -55 310 76.2 425 -55 330 74.1