Total Cloud Cover Average Cloud Amount (%) August (1954 - 1997) Night, Ship Observations Only Global Average: 67.1 Zonal Averages 15 zones Lat.N Average 85 87.0 75 84.5 65 80.6 55 82.2 45 78.2 35 57.7 25 56.6 15 64.1 5 68.1 -5 60.1 -15 62.0 -25 64.0 -35 67.8 -45 71.7 -55 76.9 Grid Box Averages 322 filled boxes Box # Lat.N Lon.E Average 1 85 60 88.9 2 85 180 89.6 3 85 300 80.4 4 75 20 85.4 5 75 60 82.4 6 75 100 88.2 7 75 140 85.6 8 75 180 87.9 9 75 220 84.8 10 75 260 76.7 11 75 300 73.8 12 75 340 87.5 13 65 10 80.0 14 65 30 77.0 15 65 50 77.9 16 65 70 80.8 21 65 170 82.5 22 65 190 85.6 23 65 210 77.8 24 65 230 71.7 25 65 250 74.8 26 65 270 68.9 27 65 290 73.6 28 65 310 79.7 29 65 330 83.2 30 65 350 85.5 31 55 10 65.1 32 55 30 56.2 37 55 130 72.3 38 55 150 79.3 39 55 170 86.9 40 55 190 93.0 41 55 210 88.8 42 55 230 79.5 44 55 270 60.9 45 55 290 72.9 46 55 310 78.8 47 55 330 87.5 48 55 350 77.7 49 45 5 34.6 50 45 15 26.6 51 45 25 25.6 52 45 35 29.5 53 45 45 32.9 54 45 55 32.5 62 45 135 66.8 63 45 145 80.3 64 45 155 88.9 65 45 165 92.9 66 45 175 93.3 67 45 185 92.8 68 45 195 89.9 69 45 205 89.5 70 45 215 90.0 71 45 225 83.9 72 45 235 66.4 77 45 285 55.8 78 45 295 62.4 79 45 305 66.8 80 45 315 72.5 81 45 325 74.7 82 45 335 78.0 83 45 345 74.0 84 45 355 63.6 85 35 5 34.1 86 35 15 19.1 87 35 25 9.6 88 35 35 19.7 97 35 125 55.8 98 35 135 58.1 99 35 145 64.8 100 35 155 67.4 101 35 165 66.7 102 35 175 65.8 103 35 185 63.8 104 35 195 62.7 105 35 205 67.1 106 35 215 70.7 107 35 225 75.4 108 35 235 70.6 109 35 245 69.1 112 35 275 53.6 113 35 285 57.4 114 35 295 57.7 115 35 305 51.4 116 35 315 48.2 117 35 325 48.9 118 35 335 56.3 119 35 345 60.8 120 35 355 35.4 124 25 35 14.1 125 25 45 7.1 126 25 55 26.4 127 25 65 72.5 129 25 85 78.1 132 25 115 60.1 133 25 125 57.6 134 25 135 58.0 135 25 145 60.3 136 25 155 56.4 137 25 165 55.2 138 25 175 55.4 139 25 185 54.2 140 25 195 55.1 141 25 205 55.8 142 25 215 66.7 143 25 225 79.1 144 25 235 83.1 145 25 245 54.8 146 25 255 54.8 147 25 265 51.1 148 25 275 51.1 149 25 285 53.8 150 25 295 49.2 151 25 305 44.3 152 25 315 45.6 153 25 325 50.1 154 25 335 59.0 155 25 345 48.0 160 15 35 43.6 161 15 45 45.6 162 15 55 39.2 163 15 65 72.8 164 15 75 76.7 165 15 85 74.3 166 15 95 83.7 167 15 105 75.3 168 15 115 69.2 169 15 125 70.0 170 15 135 72.9 171 15 145 71.4 172 15 155 65.1 173 15 165 55.2 174 15 175 57.4 175 15 185 58.3 176 15 195 57.5 177 15 205 59.7 178 15 215 68.0 179 15 225 73.3 180 15 235 73.4 181 15 245 64.3 182 15 255 67.7 183 15 265 68.5 184 15 275 62.6 185 15 285 56.8 186 15 295 49.6 187 15 305 52.2 188 15 315 56.5 189 15 325 64.8 190 15 335 65.5 191 15 345 62.6 193 5 5 79.6 197 5 45 50.9 198 5 55 44.1 199 5 65 56.4 200 5 75 66.5 201 5 85 69.4 202 5 95 79.8 203 5 105 71.0 204 5 115 70.2 205 5 125 69.9 206 5 135 74.2 207 5 145 69.9 208 5 155 67.8 209 5 165 64.2 210 5 175 61.2 211 5 185 64.4 212 5 195 61.0 213 5 205 62.2 214 5 215 68.1 215 5 225 66.8 216 5 235 67.3 217 5 245 78.4 218 5 255 80.3 219 5 265 82.8 220 5 275 82.9 221 5 285 80.1 223 5 305 55.8 224 5 315 58.1 225 5 325 57.5 226 5 335 67.8 227 5 345 78.7 228 5 355 77.8 229 -5 5 80.4 230 -5 15 68.1 233 -5 45 52.2 234 -5 55 65.2 235 -5 65 68.0 236 -5 75 67.2 237 -5 85 70.1 238 -5 95 70.3 239 -5 105 59.9 240 -5 115 42.5 241 -5 125 43.6 242 -5 135 55.5 243 -5 145 66.3 244 -5 155 71.4 245 -5 165 70.1 246 -5 175 57.1 247 -5 185 54.7 248 -5 195 49.7 249 -5 205 46.9 250 -5 215 46.5 251 -5 225 43.8 252 -5 235 42.7 253 -5 245 48.5 254 -5 255 66.9 255 -5 265 82.1 256 -5 275 88.1 257 -5 285 89.3 260 -5 315 40.9 261 -5 325 48.8 262 -5 335 51.0 263 -5 345 53.8 264 -5 355 70.2 265 -15 5 91.3 266 -15 15 73.7 268 -15 35 29.0 269 -15 45 32.7 270 -15 55 61.5 271 -15 65 60.2 272 -15 75 66.3 273 -15 85 68.6 274 -15 95 67.8 275 -15 105 58.3 276 -15 115 25.8 277 -15 125 15.0 278 -15 135 38.5 279 -15 145 50.0 280 -15 155 60.2 281 -15 165 65.2 282 -15 175 64.4 283 -15 185 63.7 284 -15 195 65.0 285 -15 205 57.3 286 -15 215 53.5 287 -15 225 46.2 288 -15 235 50.3 289 -15 245 60.2 290 -15 255 69.6 291 -15 265 77.6 292 -15 275 89.5 293 -15 285 87.7 297 -15 325 52.1 298 -15 335 59.7 299 -15 345 70.9 300 -15 355 89.9 301 -25 5 76.3 302 -25 15 49.0 304 -25 35 39.5 305 -25 45 47.5 306 -25 55 56.1 307 -25 65 62.9 308 -25 75 65.8 309 -25 85 69.6 310 -25 95 69.3 311 -25 105 62.5 312 -25 115 40.2 316 -25 155 40.9 317 -25 165 57.0 318 -25 175 63.0 319 -25 185 67.6 320 -25 195 67.3 321 -25 205 70.9 322 -25 215 68.3 323 -25 225 64.4 324 -25 235 64.5 325 -25 245 62.4 327 -25 265 77.8 328 -25 275 76.5 329 -25 285 75.0 332 -25 315 56.9 333 -25 325 57.9 334 -25 335 62.7 335 -25 345 66.2 336 -25 355 75.4 337 -35 5 75.1 338 -35 15 51.3 339 -35 25 48.2 340 -35 35 52.1 341 -35 45 67.6 342 -35 55 66.1 343 -35 65 72.5 344 -35 75 72.9 345 -35 85 77.4 346 -35 95 73.6 347 -35 105 71.2 348 -35 115 62.8 349 -35 125 62.7 350 -35 135 67.5 351 -35 145 65.1 352 -35 155 56.3 353 -35 165 64.5 354 -35 175 63.4 355 -35 185 67.5 356 -35 195 67.7 357 -35 205 70.6 358 -35 215 72.3 359 -35 225 75.2 364 -35 275 77.3 365 -35 285 66.8 367 -35 305 59.8 368 -35 315 67.0 369 -35 325 72.8 370 -35 335 69.1 371 -35 345 71.8 372 -35 355 74.4 387 -45 145 63.5 388 -45 155 74.0 389 -45 165 71.8 390 -45 175 67.3 391 -45 185 74.9 392 -45 195 77.0 400 -45 275 81.7 401 -45 285 79.5 402 -45 295 60.4 403 -45 305 63.5 404 -45 315 71.7 417 -55 170 79.0 423 -55 290 75.6 424 -55 310 75.5 425 -55 330 77.4