High Level (Cirriform) Average Cloud Amount (%) June, July, August (1954 - 1997) Day, Ship Observations Only Global Average: 12.8 Zonal Averages 15 zones Lat.N Average 85 19.7 75 18.6 65 16.9 55 17.3 45 15.7 35 12.8 25 11.8 15 17.5 5 17.9 -5 12.2 -15 7.7 -25 8.1 -35 10.8 -45 11.8 -55 10.6 Grid Box Averages 368 filled boxes Box # Lat.N Lon.E Average 1 85 60 13.6 2 85 180 25.8 3 85 300 19.1 4 75 20 14.3 5 75 60 14.4 6 75 100 15.1 7 75 140 20.3 8 75 180 23.5 9 75 220 23.2 10 75 260 19.3 11 75 300 18.3 12 75 340 15.0 13 65 10 14.1 14 65 30 14.2 15 65 50 13.5 16 65 70 16.9 20 65 150 13.5 21 65 170 14.7 22 65 190 16.4 23 65 210 17.9 24 65 230 10.4 25 65 250 22.6 26 65 270 20.3 27 65 290 23.5 28 65 310 18.7 29 65 330 15.7 30 65 350 15.6 31 55 10 15.9 32 55 30 15.7 37 55 130 12.7 38 55 150 15.1 39 55 170 16.0 40 55 190 17.4 41 55 210 16.6 42 55 230 16.1 44 55 270 20.0 45 55 290 23.3 46 55 310 19.5 47 55 330 18.1 48 55 350 17.8 49 45 5 12.8 50 45 15 8.6 51 45 25 5.9 52 45 35 5.7 53 45 45 6.7 54 45 55 7.7 61 45 125 14.2 62 45 135 17.8 63 45 145 17.4 64 45 155 17.4 65 45 165 16.4 66 45 175 18.2 67 45 185 19.7 68 45 195 17.8 69 45 205 16.6 70 45 215 15.5 71 45 225 13.5 72 45 235 11.3 77 45 285 18.6 78 45 295 20.0 79 45 305 18.1 80 45 315 18.0 81 45 325 14.4 82 45 335 13.2 83 45 345 12.1 84 45 355 12.8 85 35 5 9.4 86 35 15 5.9 87 35 25 3.5 88 35 35 2.7 89 35 45 11.0 90 35 55 8.2 96 35 115 14.2 97 35 125 17.8 98 35 135 22.8 99 35 145 19.1 100 35 155 17.8 101 35 165 22.4 102 35 175 16.0 103 35 185 14.8 104 35 195 12.7 105 35 205 12.1 106 35 215 10.3 107 35 225 9.1 108 35 235 7.0 109 35 245 6.5 112 35 275 21.6 113 35 285 19.9 114 35 295 16.4 115 35 305 12.8 116 35 315 11.2 117 35 325 8.3 118 35 335 7.8 119 35 345 6.1 120 35 355 7.9 124 25 35 5.6 125 25 45 3.0 126 25 55 8.8 127 25 65 15.2 128 25 75 15.3 129 25 85 24.1 130 25 95 32.5 131 25 105 27.6 132 25 115 19.6 133 25 125 19.0 134 25 135 19.1 135 25 145 15.8 136 25 155 15.2 137 25 165 15.1 138 25 175 13.6 139 25 185 11.8 140 25 195 9.4 141 25 205 8.6 142 25 215 7.8 143 25 225 7.9 144 25 235 7.2 145 25 245 9.6 146 25 255 14.7 147 25 265 15.4 148 25 275 16.6 149 25 285 15.3 150 25 295 12.6 151 25 305 9.7 152 25 315 6.9 153 25 325 5.8 154 25 335 7.2 155 25 345 8.5 156 25 355 7.6 160 15 35 12.1 161 15 45 15.2 162 15 55 15.3 163 15 65 20.1 164 15 75 25.6 165 15 85 27.3 166 15 95 27.5 167 15 105 36.4 168 15 115 22.4 169 15 125 22.9 170 15 135 21.0 171 15 145 18.3 172 15 155 18.8 173 15 165 19.7 174 15 175 16.3 175 15 185 14.6 176 15 195 12.8 177 15 205 10.2 178 15 215 11.6 179 15 225 10.5 180 15 235 12.5 181 15 245 13.9 182 15 255 20.6 183 15 265 25.6 184 15 275 23.1 185 15 285 18.9 186 15 295 15.6 187 15 305 13.7 188 15 315 12.8 189 15 325 12.9 190 15 335 15.7 191 15 345 20.7 193 5 5 15.1 197 5 45 15.0 198 5 55 16.9 199 5 65 23.7 200 5 75 27.6 201 5 85 27.5 202 5 95 30.4 203 5 105 25.5 204 5 115 26.3 205 5 125 22.5 206 5 135 23.6 207 5 145 19.7 208 5 155 19.8 209 5 165 21.2 210 5 175 21.1 211 5 185 15.7 212 5 195 15.0 213 5 205 11.6 214 5 215 10.4 215 5 225 11.3 216 5 235 10.4 217 5 245 12.4 218 5 255 14.8 219 5 265 18.6 220 5 275 25.2 221 5 285 30.5 222 5 295 17.8 223 5 305 13.8 224 5 315 10.7 225 5 325 8.7 226 5 335 13.1 227 5 345 15.5 228 5 355 11.1 229 -5 5 9.7 230 -5 15 8.9 232 -5 35 5.3 233 -5 45 10.4 234 -5 55 18.4 235 -5 65 23.5 236 -5 75 21.7 237 -5 85 23.9 238 -5 95 23.8 239 -5 105 19.2 240 -5 115 13.1 241 -5 125 13.3 242 -5 135 14.3 243 -5 145 18.6 244 -5 155 19.4 245 -5 165 16.9 246 -5 175 17.4 247 -5 185 13.2 248 -5 195 10.4 249 -5 205 8.5 250 -5 215 6.3 251 -5 225 3.3 252 -5 235 3.1 253 -5 245 4.1 254 -5 255 5.6 255 -5 265 6.5 256 -5 275 11.6 257 -5 285 16.0 260 -5 315 6.5 261 -5 325 6.2 262 -5 335 5.3 263 -5 345 5.9 264 -5 355 6.9 265 -15 5 4.9 266 -15 15 6.2 268 -15 35 2.9 269 -15 45 3.5 270 -15 55 5.3 271 -15 65 6.2 272 -15 75 11.0 273 -15 85 10.0 274 -15 95 11.4 275 -15 105 9.1 276 -15 115 5.8 277 -15 125 7.8 278 -15 135 10.7 279 -15 145 9.2 280 -15 155 9.8 281 -15 165 11.7 282 -15 175 10.1 283 -15 185 12.0 284 -15 195 9.0 285 -15 205 6.0 286 -15 215 5.5 287 -15 225 4.8 288 -15 235 4.4 289 -15 245 4.7 290 -15 255 4.2 291 -15 265 7.4 292 -15 275 10.7 293 -15 285 13.5 297 -15 325 8.2 298 -15 335 6.8 299 -15 345 6.6 300 -15 355 5.6 301 -25 5 5.4 302 -25 15 5.3 304 -25 35 4.2 305 -25 45 4.3 306 -25 55 4.1 307 -25 65 5.5 308 -25 75 4.3 309 -25 85 4.6 310 -25 95 4.7 311 -25 105 5.3 312 -25 115 4.6 315 -25 145 4.7 316 -25 155 5.5 317 -25 165 6.7 318 -25 175 8.2 319 -25 185 9.4 320 -25 195 9.9 321 -25 205 12.9 322 -25 215 11.6 323 -25 225 12.7 324 -25 235 10.4 325 -25 245 11.2 326 -25 255 11.3 327 -25 265 9.3 328 -25 275 6.8 329 -25 285 8.7 332 -25 315 13.1 333 -25 325 10.3 334 -25 335 9.8 335 -25 345 9.5 336 -25 355 8.7 337 -35 5 12.6 338 -35 15 9.0 339 -35 25 10.2 340 -35 35 7.6 341 -35 45 7.3 342 -35 55 7.6 343 -35 65 7.0 344 -35 75 6.9 345 -35 85 5.9 346 -35 95 7.5 347 -35 105 7.1 348 -35 115 9.0 349 -35 125 10.7 350 -35 135 12.3 351 -35 145 13.7 352 -35 155 9.6 353 -35 165 9.3 354 -35 175 9.7 355 -35 185 10.1 356 -35 195 9.8 357 -35 205 11.4 358 -35 215 11.7 359 -35 225 15.8 360 -35 235 17.0 361 -35 245 14.3 362 -35 255 18.3 363 -35 265 14.5 364 -35 275 9.2 365 -35 285 11.2 366 -35 295 16.7 367 -35 305 14.7 368 -35 315 13.7 369 -35 325 13.0 370 -35 335 11.6 371 -35 345 12.0 372 -35 355 11.8 374 -45 15 13.1 375 -45 25 12.4 376 -45 35 10.6 377 -45 45 10.2 378 -45 55 9.8 379 -45 65 11.3 380 -45 75 13.3 383 -45 105 14.3 384 -45 115 12.5 385 -45 125 12.5 386 -45 135 19.4 387 -45 145 14.1 388 -45 155 13.2 389 -45 165 14.0 390 -45 175 11.6 391 -45 185 8.8 392 -45 195 8.3 393 -45 205 8.1 394 -45 215 9.8 395 -45 225 15.7 396 -45 235 15.8 397 -45 245 13.8 398 -45 255 8.2 399 -45 265 11.4 400 -45 275 9.4 401 -45 285 9.6 402 -45 295 16.9 403 -45 305 13.7 404 -45 315 13.8 405 -45 325 10.0 406 -45 335 9.8 407 -45 345 8.8 408 -45 355 8.0 409 -55 10 7.4 411 -55 50 4.7 412 -55 70 9.4 417 -55 170 12.9 420 -55 230 12.2 421 -55 250 15.1 422 -55 270 11.8 423 -55 290 13.8 424 -55 310 12.0 425 -55 330 7.7