Altocumulus Average Cloud Amount (%) July (1954 - 1997) , Ship Observations Only Global Average: 17.0 Zonal Averages 16 zones Lat.N Average 85 19.4 75 21.2 65 21.9 55 19.3 45 18.6 35 15.7 25 13.5 15 18.6 5 23.2 -5 16.3 -15 15.1 -25 15.2 -35 15.0 -45 14.8 -55 17.5 -65 17.6 Grid Box Averages 352 filled boxes Box # Lat.N Lon.E Average 1 85 60 23.4 2 85 180 16.8 3 85 300 17.9 4 75 20 21.9 5 75 60 17.9 6 75 100 19.2 7 75 140 19.6 8 75 180 20.8 9 75 220 22.5 10 75 260 27.3 11 75 300 20.5 12 75 340 23.9 13 65 10 24.9 14 65 30 16.3 15 65 50 18.2 16 65 70 13.3 20 65 150 15.3 21 65 170 13.1 22 65 190 18.0 23 65 210 20.8 25 65 250 32.9 26 65 270 20.6 27 65 290 20.5 28 65 310 22.6 29 65 330 23.6 30 65 350 24.9 31 55 10 20.0 32 55 30 15.7 37 55 130 10.3 38 55 150 14.5 39 55 170 14.7 40 55 190 19.1 41 55 210 23.4 42 55 230 22.4 44 55 270 16.5 45 55 290 19.4 46 55 310 18.3 47 55 330 21.8 48 55 350 23.2 49 45 5 7.3 50 45 15 6.6 51 45 25 5.8 52 45 35 5.4 53 45 45 8.9 54 45 55 5.3 62 45 135 18.4 63 45 145 15.9 64 45 155 18.4 65 45 165 17.2 66 45 175 16.2 67 45 185 19.2 68 45 195 21.3 69 45 205 23.3 70 45 215 25.8 71 45 225 24.0 72 45 235 13.7 77 45 285 17.5 78 45 295 17.1 79 45 305 19.3 80 45 315 19.2 81 45 325 18.4 82 45 335 20.6 83 45 345 18.3 84 45 355 15.9 85 35 5 6.2 86 35 15 2.8 87 35 25 1.2 88 35 35 1.4 90 35 55 6.6 96 35 115 16.7 97 35 125 20.1 98 35 135 20.8 99 35 145 20.7 100 35 155 20.4 101 35 165 23.7 102 35 175 17.5 103 35 185 18.5 104 35 195 18.8 105 35 205 19.4 106 35 215 20.5 107 35 225 17.7 108 35 235 12.7 109 35 245 9.4 112 35 275 16.3 113 35 285 18.8 114 35 295 16.8 115 35 305 13.4 116 35 315 11.4 117 35 325 12.5 118 35 335 14.5 119 35 345 10.2 120 35 355 6.4 124 25 35 3.0 125 25 45 2.3 126 25 55 8.6 127 25 65 20.4 128 25 75 22.4 129 25 85 24.8 131 25 105 27.6 132 25 115 16.9 133 25 125 13.4 134 25 135 15.2 135 25 145 13.7 136 25 155 15.0 137 25 165 14.4 138 25 175 12.1 139 25 185 10.9 140 25 195 10.7 141 25 205 12.5 142 25 215 17.8 143 25 225 19.8 144 25 235 20.0 145 25 245 13.5 146 25 255 20.1 147 25 265 14.0 148 25 275 15.0 149 25 285 13.0 150 25 295 10.2 151 25 305 8.4 152 25 315 9.4 153 25 325 11.3 154 25 335 13.1 155 25 345 8.8 160 15 35 11.3 161 15 45 16.2 162 15 55 12.2 163 15 65 21.0 164 15 75 26.7 165 15 85 26.3 166 15 95 31.8 167 15 105 24.4 168 15 115 20.7 169 15 125 18.9 170 15 135 20.3 171 15 145 16.7 172 15 155 15.9 173 15 165 14.2 174 15 175 12.7 175 15 185 14.0 176 15 195 15.1 177 15 205 14.4 178 15 215 17.4 179 15 225 22.5 180 15 235 25.6 181 15 245 20.8 182 15 255 27.1 183 15 265 29.1 184 15 275 21.7 185 15 285 13.9 186 15 295 11.6 187 15 305 11.5 188 15 315 15.6 189 15 325 17.9 190 15 335 19.0 191 15 345 18.8 193 5 5 29.8 197 5 45 11.9 198 5 55 9.7 199 5 65 16.1 200 5 75 24.4 201 5 85 26.2 202 5 95 35.6 203 5 105 28.4 204 5 115 25.7 205 5 125 25.5 206 5 135 34.3 207 5 145 22.1 208 5 155 21.1 209 5 165 19.6 210 5 175 25.2 211 5 185 23.6 212 5 195 22.3 213 5 205 20.7 214 5 215 15.1 215 5 225 17.4 216 5 235 19.4 217 5 245 22.1 218 5 255 25.8 219 5 265 30.7 220 5 275 38.1 221 5 285 35.3 223 5 305 20.2 224 5 315 20.0 225 5 325 15.5 226 5 335 21.6 227 5 345 26.5 228 5 355 23.4 229 -5 5 17.1 230 -5 15 20.5 232 -5 35 14.7 233 -5 45 12.7 234 -5 55 15.9 235 -5 65 23.2 236 -5 75 23.6 237 -5 85 27.8 238 -5 95 28.8 239 -5 105 19.2 240 -5 115 15.9 241 -5 125 18.7 242 -5 135 21.4 243 -5 145 26.6 244 -5 155 24.8 245 -5 165 22.4 246 -5 175 17.1 247 -5 185 14.1 248 -5 195 11.0 249 -5 205 7.8 250 -5 215 8.5 251 -5 225 8.1 252 -5 235 6.2 253 -5 245 9.3 254 -5 255 16.3 255 -5 265 19.6 256 -5 275 21.1 257 -5 285 22.4 260 -5 315 14.1 261 -5 325 12.3 262 -5 335 9.4 263 -5 345 9.3 264 -5 355 11.0 265 -15 5 15.2 266 -15 15 36.5 268 -15 35 9.2 269 -15 45 12.1 270 -15 55 12.8 271 -15 65 14.3 272 -15 75 16.2 273 -15 85 18.5 274 -15 95 20.9 275 -15 105 15.3 276 -15 115 10.4 277 -15 125 4.4 278 -15 135 13.8 279 -15 145 14.3 280 -15 155 17.7 281 -15 165 19.4 282 -15 175 21.1 283 -15 185 17.4 284 -15 195 13.7 285 -15 205 12.1 286 -15 215 10.0 287 -15 225 11.1 288 -15 235 11.4 289 -15 245 12.5 290 -15 255 16.2 291 -15 265 18.2 292 -15 275 16.0 293 -15 285 17.5 297 -15 325 14.7 298 -15 335 11.5 299 -15 345 16.3 300 -15 355 16.6 301 -25 5 11.2 302 -25 15 8.5 304 -25 35 7.4 305 -25 45 12.7 306 -25 55 12.6 307 -25 65 13.7 308 -25 75 11.2 309 -25 85 11.6 310 -25 95 15.0 311 -25 105 16.7 312 -25 115 10.9 315 -25 145 7.0 316 -25 155 11.4 317 -25 165 14.5 318 -25 175 18.0 319 -25 185 17.1 320 -25 195 16.9 321 -25 205 22.2 322 -25 215 17.1 323 -25 225 16.6 324 -25 235 16.8 325 -25 245 18.2 326 -25 255 17.8 327 -25 265 17.7 328 -25 275 10.2 329 -25 285 13.0 332 -25 315 17.7 333 -25 325 17.9 334 -25 335 18.2 335 -25 345 16.0 336 -25 355 18.9 337 -35 5 18.3 338 -35 15 10.3 339 -35 25 8.9 340 -35 35 8.8 341 -35 45 11.3 342 -35 55 17.4 343 -35 65 15.2 344 -35 75 13.1 345 -35 85 12.5 346 -35 95 12.3 347 -35 105 12.8 348 -35 115 15.2 349 -35 125 16.7 350 -35 135 16.0 351 -35 145 16.7 352 -35 155 14.0 353 -35 165 14.7 354 -35 175 13.6 355 -35 185 13.1 356 -35 195 14.5 357 -35 205 16.6 358 -35 215 13.7 359 -35 225 20.4 360 -35 235 17.8 361 -35 245 15.3 362 -35 255 15.9 363 -35 265 16.8 364 -35 275 9.3 365 -35 285 10.3 367 -35 305 15.2 368 -35 315 17.3 369 -35 325 22.7 370 -35 335 19.0 371 -35 345 19.9 372 -35 355 19.1 377 -45 45 25.4 378 -45 55 23.6 379 -45 65 20.7 380 -45 75 17.8 386 -45 135 21.2 387 -45 145 17.8 388 -45 155 15.4 389 -45 165 15.8 390 -45 175 11.8 391 -45 185 10.1 392 -45 195 14.3 393 -45 205 11.6 394 -45 215 13.7 395 -45 225 8.0 396 -45 235 4.8 397 -45 245 4.7 398 -45 255 6.2 399 -45 265 5.6 400 -45 275 10.1 401 -45 285 11.5 402 -45 295 15.9 403 -45 305 17.7 404 -45 315 17.7 405 -45 325 18.9 406 -45 335 24.3 407 -45 345 19.1 412 -55 70 19.0 417 -55 170 21.2 421 -55 250 16.8 422 -55 270 5.9 423 -55 290 16.1 424 -55 310 20.5 425 -55 330 22.9 429 -65 50 17.6