High Level (Cirriform) Frequency of Occurrence (%) November (1954 - 1997) , Ship Observations Only Global Average: 35.2 Zonal Averages 17 zones Lat.N Average 85 52.1 75 39.5 65 28.6 55 29.7 45 30.5 35 32.0 25 28.7 15 34.8 5 43.8 -5 36.5 -15 31.4 -25 33.1 -35 34.0 -45 34.3 -55 37.6 -65 41.9 -75 49.2 Grid Box Averages 362 filled boxes Box # Lat.N Lon.E Average 1 85 60 53.1 2 85 180 47.9 3 85 300 57.0 4 75 20 22.1 5 75 60 22.3 6 75 100 37.5 7 75 140 64.1 8 75 180 47.6 9 75 220 53.0 11 75 300 40.6 12 75 340 23.8 13 65 10 24.8 14 65 30 22.4 15 65 50 23.5 21 65 170 21.3 22 65 190 24.0 23 65 210 29.9 27 65 290 47.1 28 65 310 28.6 29 65 330 30.2 30 65 350 26.0 31 55 10 29.2 32 55 30 27.3 38 55 150 24.9 39 55 170 29.6 40 55 190 28.6 41 55 210 29.6 42 55 230 35.8 45 55 290 38.8 46 55 310 28.7 47 55 330 28.3 48 55 350 35.0 49 45 5 37.1 50 45 15 34.8 51 45 25 27.7 52 45 35 21.0 53 45 45 33.2 54 45 55 28.5 62 45 135 21.4 63 45 145 22.7 64 45 155 26.1 65 45 165 26.8 66 45 175 25.7 67 45 185 29.1 68 45 195 30.7 69 45 205 32.3 70 45 215 37.5 71 45 225 35.9 72 45 235 38.2 77 45 285 31.5 78 45 295 30.8 79 45 305 31.5 80 45 315 31.9 81 45 325 31.4 82 45 335 31.4 83 45 345 31.3 84 45 355 32.8 85 35 5 34.1 86 35 15 31.1 87 35 25 26.4 88 35 35 28.0 90 35 55 33.6 96 35 115 24.5 97 35 125 21.2 98 35 135 27.1 99 35 145 28.0 100 35 155 29.6 101 35 165 30.5 102 35 175 30.6 103 35 185 35.2 104 35 195 35.5 105 35 205 38.4 106 35 215 36.4 107 35 225 34.1 108 35 235 31.5 109 35 245 30.1 112 35 275 35.7 113 35 285 31.0 114 35 295 30.3 115 35 305 32.3 116 35 315 34.7 117 35 325 34.7 118 35 335 34.3 119 35 345 30.3 120 35 355 33.6 124 25 35 19.1 125 25 45 35.9 126 25 55 20.6 127 25 65 15.4 128 25 75 24.0 129 25 85 31.0 130 25 95 27.9 131 25 105 24.1 132 25 115 22.5 133 25 125 24.0 134 25 135 26.3 135 25 145 26.9 136 25 155 24.3 137 25 165 23.3 138 25 175 24.8 139 25 185 29.4 140 25 195 29.5 141 25 205 29.4 142 25 215 29.3 143 25 225 31.5 144 25 235 30.8 145 25 245 32.9 146 25 255 36.1 147 25 265 34.4 148 25 275 35.1 149 25 285 30.5 150 25 295 29.7 151 25 305 30.3 152 25 315 32.2 153 25 325 31.8 154 25 335 29.1 155 25 345 30.4 160 15 35 15.9 161 15 45 13.5 162 15 55 17.5 163 15 65 25.1 164 15 75 39.2 165 15 85 42.4 166 15 95 48.4 167 15 105 33.2 168 15 115 36.3 169 15 125 39.6 170 15 135 38.3 171 15 145 35.0 172 15 155 30.4 173 15 165 21.2 174 15 175 25.8 175 15 185 35.1 176 15 195 31.1 177 15 205 33.2 178 15 215 34.7 179 15 225 41.1 180 15 235 41.0 181 15 245 38.9 182 15 255 37.2 183 15 265 41.0 184 15 275 49.1 185 15 285 40.2 186 15 295 33.6 187 15 305 31.2 188 15 315 34.5 189 15 325 38.1 190 15 335 34.9 191 15 345 38.3 193 5 5 38.4 197 5 45 23.3 198 5 55 23.6 199 5 65 35.1 200 5 75 46.7 201 5 85 54.9 202 5 95 65.1 203 5 105 59.4 204 5 115 57.8 205 5 125 56.2 206 5 135 61.3 207 5 145 53.7 208 5 155 54.5 209 5 165 51.6 210 5 175 58.7 211 5 185 56.8 212 5 195 39.3 213 5 205 41.8 214 5 215 36.4 215 5 225 34.8 216 5 235 31.0 217 5 245 32.2 218 5 255 31.4 219 5 265 34.8 220 5 275 46.5 221 5 285 47.9 223 5 305 42.8 224 5 315 38.5 225 5 325 35.8 226 5 335 38.6 227 5 345 34.5 228 5 355 31.6 229 -5 5 28.8 230 -5 15 31.0 232 -5 35 43.9 233 -5 45 23.5 234 -5 55 27.6 235 -5 65 40.2 236 -5 75 48.9 237 -5 85 58.1 238 -5 95 64.2 239 -5 105 66.6 240 -5 115 62.7 241 -5 125 53.0 242 -5 135 50.9 243 -5 145 56.3 244 -5 155 58.8 245 -5 165 58.8 246 -5 175 60.0 247 -5 185 57.8 248 -5 195 41.1 249 -5 205 33.2 250 -5 215 25.1 251 -5 225 14.5 252 -5 235 12.6 253 -5 245 12.9 254 -5 255 11.0 255 -5 265 14.6 256 -5 275 31.6 257 -5 285 35.6 260 -5 315 31.7 261 -5 325 25.9 262 -5 335 22.7 263 -5 345 16.7 264 -5 355 18.3 265 -15 5 15.3 266 -15 15 22.1 268 -15 35 26.8 269 -15 45 29.7 270 -15 55 27.8 271 -15 65 30.7 272 -15 75 37.3 273 -15 85 40.9 274 -15 95 40.5 275 -15 105 35.7 276 -15 115 23.7 277 -15 125 29.4 278 -15 135 43.2 279 -15 145 32.0 280 -15 155 31.9 281 -15 165 38.1 282 -15 175 42.4 283 -15 185 48.3 284 -15 195 47.8 285 -15 205 45.3 286 -15 215 39.2 287 -15 225 24.0 288 -15 235 22.6 289 -15 245 17.9 290 -15 255 18.0 291 -15 265 17.3 292 -15 275 30.6 293 -15 285 31.3 297 -15 325 39.5 298 -15 335 26.2 299 -15 345 27.3 300 -15 355 19.1 301 -25 5 19.2 302 -25 15 20.9 304 -25 35 31.6 305 -25 45 30.4 306 -25 55 30.4 307 -25 65 23.5 308 -25 75 25.7 309 -25 85 26.7 310 -25 95 25.3 311 -25 105 23.9 312 -25 115 17.7 315 -25 145 25.7 316 -25 155 27.4 317 -25 165 31.9 318 -25 175 39.5 319 -25 185 41.4 320 -25 195 41.1 321 -25 205 45.5 322 -25 215 50.5 323 -25 225 45.9 324 -25 235 42.3 325 -25 245 35.1 326 -25 255 38.5 327 -25 265 28.8 328 -25 275 20.1 329 -25 285 19.9 332 -25 315 42.9 333 -25 325 42.8 334 -25 335 38.7 335 -25 345 40.2 336 -25 355 31.0 337 -35 5 36.9 338 -35 15 30.6 339 -35 25 31.0 340 -35 35 29.6 341 -35 45 23.6 342 -35 55 30.5 343 -35 65 34.1 344 -35 75 38.0 345 -35 85 33.2 346 -35 95 29.4 347 -35 105 28.1 348 -35 115 28.7 349 -35 125 32.8 350 -35 135 33.8 351 -35 145 32.4 352 -35 155 33.2 353 -35 165 34.7 354 -35 175 37.1 355 -35 185 37.3 356 -35 195 38.1 357 -35 205 36.7 358 -35 215 31.5 359 -35 225 35.0 360 -35 235 49.6 361 -35 245 38.9 362 -35 255 37.2 363 -35 265 28.5 364 -35 275 23.3 365 -35 285 27.3 366 -35 295 41.6 367 -35 305 35.8 368 -35 315 33.8 369 -35 325 29.5 370 -35 335 36.0 371 -35 345 44.9 372 -35 355 44.2 374 -45 15 32.8 377 -45 45 27.3 378 -45 55 23.9 379 -45 65 26.0 380 -45 75 31.0 381 -45 85 29.8 382 -45 95 35.3 383 -45 105 27.8 384 -45 115 29.8 385 -45 125 44.2 386 -45 135 54.5 387 -45 145 42.9 388 -45 155 39.4 389 -45 165 36.9 390 -45 175 40.9 391 -45 185 39.5 392 -45 195 36.3 393 -45 205 30.4 394 -45 215 43.1 400 -45 275 28.4 401 -45 285 38.1 402 -45 295 44.5 403 -45 305 39.6 404 -45 315 33.0 405 -45 325 20.7 406 -45 335 24.8 409 -55 10 26.1 411 -55 50 30.6 412 -55 70 38.4 413 -55 90 46.8 414 -55 110 46.4 415 -55 130 45.8 416 -55 150 39.4 417 -55 170 29.1 422 -55 270 33.9 423 -55 290 52.4 424 -55 310 38.4 425 -55 330 26.8 429 -65 50 50.0 430 -65 70 46.9 431 -65 90 46.4 432 -65 110 37.6 433 -65 130 39.8 434 -65 150 38.1 435 -65 170 36.3 441 -65 290 47.1 442 -65 310 37.6 449 -75 180 41.4 453 -75 340 61.6