High Level (Cirriform) Frequency of Occurrence (%) February (1954 - 1997) Day, Ship Observations Only Global Average: 39.3 Zonal Averages 17 zones Lat.N Average 85 61.2 75 50.4 65 36.9 55 36.1 45 37.2 35 37.5 25 29.3 15 29.0 5 44.6 -5 47.0 -15 45.0 -25 37.6 -35 35.8 -45 38.4 -55 40.7 -65 42.4 -75 43.8 Grid Box Averages 372 filled boxes Box # Lat.N Lon.E Average 1 85 60 73.0 2 85 180 60.4 3 85 300 46.0 4 75 20 27.8 5 75 60 29.2 7 75 140 54.0 8 75 180 64.0 9 75 220 85.1 12 75 340 30.5 13 65 10 35.0 14 65 30 34.3 15 65 50 43.8 21 65 170 22.0 22 65 190 21.1 23 65 210 35.6 29 65 330 50.0 30 65 350 39.3 31 55 10 36.5 32 55 30 28.3 38 55 150 31.8 39 55 170 34.2 40 55 190 31.5 41 55 210 36.4 42 55 230 42.4 46 55 310 32.7 47 55 330 39.0 48 55 350 46.1 49 45 5 44.2 50 45 15 36.6 51 45 25 29.3 52 45 35 26.8 53 45 45 30.4 54 45 55 25.1 62 45 135 24.0 63 45 145 28.1 64 45 155 29.0 65 45 165 32.7 66 45 175 35.0 67 45 185 37.6 68 45 195 36.6 69 45 205 41.8 70 45 215 42.4 71 45 225 44.4 72 45 235 47.2 77 45 285 31.2 78 45 295 36.1 79 45 305 37.7 80 45 315 38.5 81 45 325 37.7 82 45 335 39.5 83 45 345 40.6 84 45 355 39.8 85 35 5 39.6 86 35 15 34.4 87 35 25 31.1 88 35 35 29.6 90 35 55 30.4 96 35 115 13.8 97 35 125 25.1 98 35 135 31.0 99 35 145 28.6 100 35 155 30.1 101 35 165 31.4 102 35 175 32.8 103 35 185 35.8 104 35 195 39.2 105 35 205 42.5 106 35 215 44.7 107 35 225 44.6 108 35 235 42.2 109 35 245 44.1 112 35 275 44.3 113 35 285 39.3 114 35 295 38.0 115 35 305 40.4 116 35 315 44.7 117 35 325 43.7 118 35 335 41.7 119 35 345 36.9 120 35 355 40.9 124 25 35 20.9 125 25 45 34.4 126 25 55 24.0 127 25 65 19.9 128 25 75 10.9 129 25 85 22.3 132 25 115 24.9 133 25 125 24.5 134 25 135 22.5 135 25 145 24.5 136 25 155 23.8 137 25 165 23.1 138 25 175 24.2 139 25 185 23.8 140 25 195 24.5 141 25 205 29.0 142 25 215 35.0 143 25 225 39.7 144 25 235 41.5 145 25 245 40.9 146 25 255 42.6 147 25 265 38.1 148 25 275 35.0 149 25 285 30.6 150 25 295 27.3 151 25 305 28.6 152 25 315 32.0 153 25 325 31.7 154 25 335 27.9 155 25 345 27.9 160 15 35 20.2 161 15 45 20.7 162 15 55 17.9 163 15 65 18.7 164 15 75 26.2 165 15 85 27.6 166 15 95 36.0 167 15 105 34.6 168 15 115 32.4 169 15 125 36.7 170 15 135 38.3 171 15 145 40.4 172 15 155 34.2 173 15 165 27.1 174 15 175 20.9 175 15 185 21.8 176 15 195 21.1 177 15 205 24.2 178 15 215 29.7 179 15 225 35.6 180 15 235 38.5 181 15 245 36.2 182 15 255 32.7 183 15 265 25.1 184 15 275 28.6 185 15 285 24.8 186 15 295 23.6 187 15 305 24.9 188 15 315 27.1 189 15 325 27.1 190 15 335 30.1 191 15 345 33.7 193 5 5 41.4 197 5 45 29.2 198 5 55 26.3 199 5 65 30.1 200 5 75 40.1 201 5 85 52.1 202 5 95 59.4 203 5 105 55.2 204 5 115 57.2 205 5 125 63.5 206 5 135 67.7 207 5 145 64.6 208 5 155 68.4 209 5 165 60.6 210 5 175 56.0 211 5 185 55.0 212 5 195 39.5 213 5 205 36.8 214 5 215 37.6 215 5 225 33.5 216 5 235 34.4 217 5 245 28.0 218 5 255 30.2 219 5 265 32.4 220 5 275 39.5 221 5 285 38.5 223 5 305 37.9 224 5 315 44.4 225 5 325 45.0 226 5 335 36.1 227 5 345 35.6 228 5 355 40.1 229 -5 5 39.5 230 -5 15 43.9 232 -5 35 39.0 233 -5 45 41.8 234 -5 55 45.6 235 -5 65 52.0 236 -5 75 59.8 237 -5 85 63.1 238 -5 95 66.9 239 -5 105 70.7 240 -5 115 73.0 241 -5 125 72.4 242 -5 135 72.4 243 -5 145 76.8 244 -5 155 74.2 245 -5 165 73.0 246 -5 175 69.4 247 -5 185 54.8 248 -5 195 51.9 249 -5 205 38.0 250 -5 215 37.5 251 -5 225 26.5 252 -5 235 20.6 253 -5 245 18.4 254 -5 255 21.0 255 -5 265 23.9 256 -5 275 42.9 257 -5 285 42.4 260 -5 315 59.4 261 -5 325 46.4 262 -5 335 32.3 263 -5 345 22.9 264 -5 355 25.3 265 -15 5 26.1 266 -15 15 39.8 268 -15 35 52.0 269 -15 45 63.4 270 -15 55 57.7 271 -15 65 51.3 272 -15 75 50.8 273 -15 85 45.5 274 -15 95 47.0 275 -15 105 48.3 276 -15 115 51.8 277 -15 125 64.3 278 -15 135 72.0 279 -15 145 65.0 280 -15 155 59.6 281 -15 165 63.2 282 -15 175 61.8 283 -15 185 67.7 284 -15 195 63.3 285 -15 205 59.5 286 -15 215 52.3 287 -15 225 41.4 288 -15 235 33.9 289 -15 245 25.7 290 -15 255 19.1 291 -15 265 19.0 292 -15 275 29.5 293 -15 285 45.0 297 -15 325 44.3 298 -15 335 23.3 299 -15 345 18.4 300 -15 355 22.4 301 -25 5 15.0 302 -25 15 14.9 304 -25 35 34.0 305 -25 45 35.2 306 -25 55 44.5 307 -25 65 40.6 308 -25 75 37.1 309 -25 85 33.1 310 -25 95 27.9 311 -25 105 28.6 312 -25 115 31.4 315 -25 145 52.9 316 -25 155 40.7 317 -25 165 43.9 318 -25 175 47.2 319 -25 185 49.3 320 -25 195 47.1 321 -25 205 55.8 322 -25 215 52.5 323 -25 225 54.7 324 -25 235 48.3 325 -25 245 36.8 326 -25 255 31.8 327 -25 265 30.8 328 -25 275 26.1 329 -25 285 23.4 332 -25 315 49.4 333 -25 325 47.4 334 -25 335 40.3 335 -25 345 27.2 336 -25 355 20.7 337 -35 5 24.9 338 -35 15 19.2 339 -35 25 24.9 340 -35 35 29.6 341 -35 45 33.7 342 -35 55 32.8 343 -35 65 39.1 344 -35 75 38.8 345 -35 85 37.3 346 -35 95 35.4 347 -35 105 30.1 348 -35 115 28.4 349 -35 125 32.8 350 -35 135 33.1 351 -35 145 32.3 352 -35 155 36.3 353 -35 165 37.2 354 -35 175 41.9 355 -35 185 43.8 356 -35 195 43.2 357 -35 205 44.3 358 -35 215 48.0 359 -35 225 55.8 360 -35 235 42.5 361 -35 245 43.9 362 -35 255 32.7 363 -35 265 28.1 364 -35 275 20.0 365 -35 285 18.4 367 -35 305 33.6 368 -35 315 33.7 369 -35 325 41.0 370 -35 335 45.0 371 -35 345 39.6 372 -35 355 34.0 373 -45 5 45.3 374 -45 15 36.7 375 -45 25 46.5 376 -45 35 36.4 377 -45 45 38.8 378 -45 55 36.6 379 -45 65 37.9 380 -45 75 45.6 381 -45 85 37.3 382 -45 95 33.4 383 -45 105 43.8 384 -45 115 29.6 385 -45 125 32.2 386 -45 135 44.5 387 -45 145 45.5 388 -45 155 38.3 389 -45 165 36.3 390 -45 175 48.2 391 -45 185 45.2 392 -45 195 42.4 393 -45 205 34.8 394 -45 215 36.2 399 -45 265 29.9 400 -45 275 25.2 401 -45 285 29.5 402 -45 295 44.0 403 -45 305 39.1 404 -45 315 37.4 405 -45 325 34.8 406 -45 335 44.0 407 -45 345 40.2 408 -45 355 35.0 409 -55 10 40.6 410 -55 30 42.3 411 -55 50 39.9 412 -55 70 35.8 413 -55 90 47.2 414 -55 110 33.0 415 -55 130 43.9 416 -55 150 39.7 417 -55 170 33.6 418 -55 190 37.5 422 -55 270 38.5 423 -55 290 55.5 424 -55 310 51.6 425 -55 330 37.1 426 -55 350 36.3 427 -65 10 42.8 428 -65 30 52.4 429 -65 50 38.5 430 -65 70 34.4 431 -65 90 32.9 432 -65 110 47.3 433 -65 130 54.0 434 -65 150 46.9 435 -65 170 39.5 436 -65 190 36.5 437 -65 210 37.0 440 -65 270 33.3 441 -65 290 63.3 442 -65 310 44.0 443 -65 330 49.8 444 -65 350 29.6 449 -75 180 46.8 450 -75 220 36.3 452 -75 300 47.2 453 -75 340 45.5