Altocumulus Average Cloud Amount (%) March (1954 - 1997) , Ship Observations Only Global Average: 16.9 Zonal Averages 17 zones Lat.N Average 85 13.1 75 12.0 65 13.7 55 12.3 45 13.0 35 15.5 25 13.6 15 10.7 5 17.3 -5 19.1 -15 16.6 -25 17.6 -35 18.3 -45 21.5 -55 22.1 -65 20.1 -75 15.9 Grid Box Averages 383 filled boxes Box # Lat.N Lon.E Average 1 85 60 17.6 2 85 180 11.4 3 85 300 9.5 4 75 20 15.8 5 75 60 9.0 6 75 100 2.2 7 75 140 16.9 8 75 180 8.7 9 75 220 15.5 12 75 340 11.1 13 65 10 19.6 14 65 30 14.5 15 65 50 9.0 21 65 170 5.1 22 65 190 6.2 23 65 210 7.7 29 65 330 14.8 30 65 350 16.7 31 55 10 15.6 32 55 30 15.7 38 55 150 7.6 39 55 170 9.3 40 55 190 10.6 41 55 210 12.5 42 55 230 12.0 46 55 310 11.0 47 55 330 16.9 48 55 350 16.2 49 45 5 15.2 50 45 15 13.4 51 45 25 12.0 52 45 35 11.6 53 45 45 12.4 54 45 55 8.4 62 45 135 6.8 63 45 145 6.9 64 45 155 8.8 65 45 165 10.6 66 45 175 10.9 67 45 185 13.1 68 45 195 12.7 69 45 205 13.7 70 45 215 14.4 71 45 225 14.6 72 45 235 14.7 77 45 285 11.0 78 45 295 11.6 79 45 305 12.6 80 45 315 15.3 81 45 325 16.7 82 45 335 17.1 83 45 345 15.3 84 45 355 15.4 85 35 5 15.0 86 35 15 12.9 87 35 25 12.9 88 35 35 10.9 89 35 45 11.7 90 35 55 15.6 96 35 115 3.5 97 35 125 12.9 98 35 135 13.0 99 35 145 12.3 100 35 155 13.8 101 35 165 14.7 102 35 175 15.0 103 35 185 17.7 104 35 195 17.5 105 35 205 17.2 106 35 215 18.9 107 35 225 15.6 108 35 235 12.1 109 35 245 9.1 112 35 275 15.0 113 35 285 16.4 114 35 295 17.0 115 35 305 17.7 116 35 315 17.9 117 35 325 17.9 118 35 335 17.2 119 35 345 14.4 120 35 355 12.7 124 25 35 6.4 125 25 45 15.5 126 25 55 9.5 127 25 65 4.9 128 25 75 2.7 129 25 85 5.3 130 25 95 8.1 131 25 105 24.7 132 25 115 18.5 133 25 125 15.0 134 25 135 13.4 135 25 145 14.0 136 25 155 13.6 137 25 165 13.8 138 25 175 12.9 139 25 185 13.3 140 25 195 12.6 141 25 205 14.3 142 25 215 17.3 143 25 225 19.9 144 25 235 18.6 145 25 245 12.5 146 25 255 11.8 147 25 265 18.5 148 25 275 13.7 149 25 285 12.5 150 25 295 11.4 151 25 305 11.5 152 25 315 13.6 153 25 325 12.8 154 25 335 10.8 155 25 345 7.2 160 15 35 7.2 161 15 45 6.8 162 15 55 3.6 163 15 65 2.7 164 15 75 3.7 165 15 85 4.8 166 15 95 5.1 167 15 105 9.7 168 15 115 7.7 169 15 125 10.1 170 15 135 9.5 171 15 145 9.7 172 15 155 10.3 173 15 165 9.4 174 15 175 9.2 175 15 185 9.7 176 15 195 13.9 177 15 205 14.3 178 15 215 17.2 179 15 225 24.2 180 15 235 23.8 181 15 245 16.6 182 15 255 7.8 183 15 265 5.9 184 15 275 8.3 185 15 285 8.0 186 15 295 8.6 187 15 305 9.6 188 15 315 12.3 189 15 325 12.7 190 15 335 10.5 191 15 345 7.4 193 5 5 20.2 197 5 45 4.0 198 5 55 5.5 199 5 65 5.5 200 5 75 8.5 201 5 85 16.5 202 5 95 23.0 203 5 105 15.8 204 5 115 15.8 205 5 125 18.0 206 5 135 20.5 207 5 145 19.1 208 5 155 21.7 209 5 165 22.5 210 5 175 19.9 211 5 185 19.8 212 5 195 19.2 213 5 205 23.5 214 5 215 20.8 215 5 225 19.0 216 5 235 19.1 217 5 245 14.2 218 5 255 11.6 219 5 265 14.4 220 5 275 15.8 221 5 285 16.3 223 5 305 15.1 224 5 315 24.4 225 5 325 21.3 226 5 335 17.4 227 5 345 15.4 228 5 355 18.2 229 -5 5 21.3 230 -5 15 21.3 232 -5 35 13.3 233 -5 45 10.9 234 -5 55 10.1 235 -5 65 15.1 236 -5 75 18.3 237 -5 85 23.1 238 -5 95 27.2 239 -5 105 30.0 240 -5 115 30.8 241 -5 125 24.9 242 -5 135 28.2 243 -5 145 32.0 244 -5 155 26.6 245 -5 165 28.1 246 -5 175 23.9 247 -5 185 19.7 248 -5 195 19.3 249 -5 205 11.4 250 -5 215 11.2 251 -5 225 12.1 252 -5 235 13.9 253 -5 245 17.6 254 -5 255 18.7 255 -5 265 17.4 256 -5 275 24.1 257 -5 285 25.6 260 -5 315 33.0 261 -5 325 20.3 262 -5 335 13.9 263 -5 345 10.2 264 -5 355 11.2 265 -15 5 16.6 266 -15 15 28.9 268 -15 35 11.7 269 -15 45 16.8 270 -15 55 13.9 271 -15 65 13.9 272 -15 75 17.1 273 -15 85 15.9 274 -15 95 17.9 275 -15 105 13.6 276 -15 115 12.4 277 -15 125 18.6 278 -15 135 24.5 279 -15 145 23.5 280 -15 155 19.2 281 -15 165 20.8 282 -15 175 24.8 283 -15 185 25.9 284 -15 195 20.4 285 -15 205 15.5 286 -15 215 13.5 287 -15 225 10.6 288 -15 235 12.2 289 -15 245 15.6 290 -15 255 17.1 291 -15 265 16.1 292 -15 275 17.1 293 -15 285 20.3 297 -15 325 15.8 298 -15 335 11.0 299 -15 345 11.4 300 -15 355 13.8 301 -25 5 14.7 302 -25 15 12.2 304 -25 35 12.2 305 -25 45 13.9 306 -25 55 17.6 307 -25 65 16.2 308 -25 75 18.9 309 -25 85 16.7 310 -25 95 20.2 311 -25 105 16.3 312 -25 115 11.7 315 -25 145 19.8 316 -25 155 13.9 317 -25 165 16.2 318 -25 175 19.9 319 -25 185 23.7 320 -25 195 26.3 321 -25 205 20.4 322 -25 215 18.5 323 -25 225 17.7 324 -25 235 16.0 325 -25 245 16.2 326 -25 255 15.6 327 -25 265 17.4 328 -25 275 17.4 329 -25 285 23.5 332 -25 315 22.3 333 -25 325 18.6 334 -25 335 15.6 335 -25 345 14.3 336 -25 355 16.6 337 -35 5 18.0 338 -35 15 10.6 339 -35 25 13.8 340 -35 35 14.5 341 -35 45 16.8 342 -35 55 18.9 343 -35 65 20.0 344 -35 75 18.3 345 -35 85 20.0 346 -35 95 23.7 347 -35 105 19.6 348 -35 115 15.6 349 -35 125 21.1 350 -35 135 20.3 351 -35 145 16.7 352 -35 155 16.2 353 -35 165 17.5 354 -35 175 17.8 355 -35 185 21.2 356 -35 195 21.3 357 -35 205 21.6 358 -35 215 21.2 359 -35 225 23.6 360 -35 235 22.7 361 -35 245 19.7 362 -35 255 17.9 363 -35 265 15.4 364 -35 275 15.7 365 -35 285 12.6 367 -35 305 11.8 368 -35 315 14.8 369 -35 325 15.9 370 -35 335 17.9 371 -35 345 19.9 372 -35 355 19.6 373 -45 5 18.8 374 -45 15 25.6 375 -45 25 31.2 376 -45 35 26.5 377 -45 45 28.0 378 -45 55 18.7 379 -45 65 17.5 380 -45 75 21.3 381 -45 85 27.0 382 -45 95 23.8 383 -45 105 19.8 384 -45 115 18.3 385 -45 125 19.5 386 -45 135 20.9 387 -45 145 17.9 388 -45 155 20.7 389 -45 165 15.9 390 -45 175 17.2 391 -45 185 21.8 392 -45 195 21.1 393 -45 205 21.7 394 -45 215 22.1 395 -45 225 22.3 396 -45 235 25.5 398 -45 255 33.2 399 -45 265 27.4 400 -45 275 13.2 401 -45 285 13.3 402 -45 295 12.6 403 -45 305 14.9 404 -45 315 19.6 405 -45 325 18.4 406 -45 335 16.3 407 -45 345 28.4 408 -45 355 22.1 409 -55 10 26.3 410 -55 30 23.2 411 -55 50 24.9 412 -55 70 20.1 413 -55 90 16.1 414 -55 110 19.0 415 -55 130 26.8 416 -55 150 20.4 417 -55 170 25.3 418 -55 190 22.0 419 -55 210 19.3 420 -55 230 15.8 421 -55 250 20.4 422 -55 270 19.2 423 -55 290 20.3 424 -55 310 25.6 425 -55 330 25.4 426 -55 350 28.3 427 -65 10 21.0 428 -65 30 21.5 429 -65 50 21.5 430 -65 70 13.3 431 -65 90 19.8 432 -65 110 22.4 433 -65 130 21.0 434 -65 150 15.9 435 -65 170 20.6 436 -65 190 13.8 437 -65 210 18.8 438 -65 230 16.8 440 -65 270 23.9 441 -65 290 17.3 442 -65 310 29.5 443 -65 330 18.6 444 -65 350 25.4 449 -75 180 14.2 450 -75 220 14.5 452 -75 300 15.0 453 -75 340 21.4