High Level (Cirriform) Frequency of Occurrence (%) July (1954 - 1997) , Ship Observations Only Global Average: 33.9 Zonal Averages 15 zones Lat.N Average 85 58.0 75 53.8 65 50.3 55 48.6 45 43.5 35 35.2 25 34.2 15 43.4 5 46.8 -5 33.0 -15 22.0 -25 21.7 -35 27.0 -45 27.6 -55 27.8 Grid Box Averages 343 filled boxes Box # Lat.N Lon.E Average 1 85 60 54.0 2 85 180 60.5 3 85 300 60.0 4 75 20 47.5 5 75 60 45.0 6 75 100 55.2 7 75 140 62.3 8 75 180 55.3 9 75 220 60.0 10 75 260 60.4 11 75 300 57.0 12 75 340 45.5 13 65 10 44.8 14 65 30 45.3 15 65 50 43.6 16 65 70 42.0 20 65 150 47.7 21 65 170 41.8 22 65 190 50.2 23 65 210 55.6 25 65 250 60.3 26 65 270 60.4 27 65 290 59.2 28 65 310 59.5 29 65 330 47.5 30 65 350 45.9 31 55 10 43.4 32 55 30 43.0 37 55 130 51.0 38 55 150 44.6 39 55 170 44.8 40 55 190 52.5 41 55 210 50.2 42 55 230 46.5 44 55 270 58.2 45 55 290 59.6 46 55 310 52.4 47 55 330 46.4 48 55 350 47.9 49 45 5 27.0 50 45 15 21.8 51 45 25 12.0 52 45 35 13.8 53 45 45 23.0 54 45 55 25.0 62 45 135 47.8 63 45 145 42.7 64 45 155 49.4 65 45 165 51.8 66 45 175 50.0 67 45 185 56.0 68 45 195 55.5 69 45 205 52.5 70 45 215 45.3 71 45 225 37.1 72 45 235 29.3 77 45 285 47.5 78 45 295 52.7 79 45 305 48.6 80 45 315 43.0 81 45 325 36.6 82 45 335 35.5 83 45 345 34.0 84 45 355 33.9 85 35 5 17.7 86 35 15 11.1 87 35 25 5.9 88 35 35 5.3 90 35 55 27.9 96 35 115 37.8 97 35 125 47.1 98 35 135 55.1 99 35 145 52.2 100 35 155 50.1 101 35 165 52.7 102 35 175 44.5 103 35 185 44.1 104 35 195 44.4 105 35 205 39.3 106 35 215 30.7 107 35 225 24.7 108 35 235 19.9 109 35 245 19.9 112 35 275 56.9 113 35 285 52.1 114 35 295 46.7 115 35 305 36.6 116 35 315 30.8 117 35 325 24.1 118 35 335 20.8 119 35 345 14.9 120 35 355 15.8 124 25 35 14.0 125 25 45 7.1 126 25 55 20.4 127 25 65 32.6 129 25 85 64.6 131 25 105 56.9 132 25 115 50.1 133 25 125 47.0 134 25 135 53.7 135 25 145 48.7 136 25 155 45.1 137 25 165 43.2 138 25 175 40.0 139 25 185 36.7 140 25 195 33.4 141 25 205 26.0 142 25 215 25.3 143 25 225 23.0 144 25 235 23.4 145 25 245 33.7 146 25 255 51.6 147 25 265 49.5 148 25 275 54.7 149 25 285 49.1 150 25 295 36.5 151 25 305 23.9 152 25 315 18.0 153 25 325 15.4 154 25 335 14.0 155 25 345 15.4 160 15 35 27.1 161 15 45 30.5 162 15 55 29.7 163 15 65 40.1 164 15 75 52.2 165 15 85 59.2 166 15 95 63.8 167 15 105 68.2 168 15 115 55.5 169 15 125 54.5 170 15 135 59.4 171 15 145 54.7 172 15 155 49.4 173 15 165 43.8 174 15 175 42.2 175 15 185 39.6 176 15 195 40.4 177 15 205 27.0 178 15 215 33.7 179 15 225 34.6 180 15 235 40.1 181 15 245 44.2 182 15 255 59.1 183 15 265 65.6 184 15 275 60.8 185 15 285 50.2 186 15 295 39.2 187 15 305 28.2 188 15 315 25.0 189 15 325 25.7 190 15 335 29.0 191 15 345 34.5 193 5 5 41.0 197 5 45 36.5 198 5 55 35.8 199 5 65 48.2 200 5 75 57.3 201 5 85 60.3 202 5 95 69.8 203 5 105 60.2 204 5 115 58.2 205 5 125 59.9 206 5 135 70.3 207 5 145 58.9 208 5 155 56.5 209 5 165 49.8 210 5 175 55.5 211 5 185 54.3 212 5 195 47.3 213 5 205 35.3 214 5 215 35.6 215 5 225 31.8 216 5 235 35.0 217 5 245 34.3 218 5 255 46.3 219 5 265 53.3 220 5 275 64.7 221 5 285 63.1 223 5 305 37.5 224 5 315 32.7 225 5 325 23.8 226 5 335 29.5 227 5 345 33.0 228 5 355 25.2 229 -5 5 25.6 230 -5 15 17.8 232 -5 35 19.5 233 -5 45 30.5 234 -5 55 43.0 235 -5 65 55.0 236 -5 75 51.3 237 -5 85 56.3 238 -5 95 60.4 239 -5 105 44.4 240 -5 115 39.4 241 -5 125 39.0 242 -5 135 36.9 243 -5 145 59.4 244 -5 155 55.4 245 -5 165 45.5 246 -5 175 46.2 247 -5 185 46.8 248 -5 195 35.0 249 -5 205 24.9 250 -5 215 19.3 251 -5 225 11.0 252 -5 235 8.3 253 -5 245 12.3 254 -5 255 18.3 255 -5 265 24.2 256 -5 275 28.4 257 -5 285 42.7 260 -5 315 30.1 261 -5 325 20.2 262 -5 335 15.7 263 -5 345 11.3 264 -5 355 15.8 265 -15 5 14.3 266 -15 15 12.4 268 -15 35 8.8 269 -15 45 13.9 270 -15 55 16.5 271 -15 65 18.4 272 -15 75 27.4 273 -15 85 27.7 274 -15 95 36.8 275 -15 105 26.9 276 -15 115 18.8 277 -15 125 20.1 278 -15 135 28.0 279 -15 145 21.5 280 -15 155 27.9 281 -15 165 32.7 282 -15 175 30.0 283 -15 185 34.8 284 -15 195 24.3 285 -15 205 17.7 286 -15 215 17.0 287 -15 225 13.4 288 -15 235 15.7 289 -15 245 13.9 290 -15 255 13.9 291 -15 265 29.7 292 -15 275 24.4 293 -15 285 22.9 297 -15 325 24.6 298 -15 335 18.8 299 -15 345 18.9 300 -15 355 14.2 301 -25 5 17.2 302 -25 15 12.6 304 -25 35 10.5 305 -25 45 13.6 306 -25 55 13.2 307 -25 65 14.1 308 -25 75 12.7 309 -25 85 13.3 310 -25 95 13.7 311 -25 105 15.9 312 -25 115 12.8 315 -25 145 18.7 316 -25 155 16.9 317 -25 165 19.1 318 -25 175 24.4 319 -25 185 23.2 320 -25 195 22.8 321 -25 205 31.1 322 -25 215 30.6 323 -25 225 31.8 324 -25 235 25.3 325 -25 245 28.6 326 -25 255 38.3 327 -25 265 27.5 328 -25 275 18.1 329 -25 285 19.3 332 -25 315 30.7 333 -25 325 26.8 334 -25 335 24.5 335 -25 345 25.6 336 -25 355 22.7 337 -35 5 27.7 338 -35 15 22.2 339 -35 25 23.2 340 -35 35 17.1 341 -35 45 22.0 342 -35 55 18.6 343 -35 65 15.4 344 -35 75 19.1 345 -35 85 14.0 346 -35 95 17.6 347 -35 105 16.0 348 -35 115 23.6 349 -35 125 27.0 350 -35 135 31.1 351 -35 145 30.9 352 -35 155 24.9 353 -35 165 23.0 354 -35 175 23.7 355 -35 185 24.5 356 -35 195 21.4 357 -35 205 29.6 358 -35 215 29.1 359 -35 225 41.4 360 -35 235 47.5 361 -35 245 43.8 362 -35 255 41.4 363 -35 265 40.3 364 -35 275 15.4 365 -35 285 27.2 367 -35 305 34.8 368 -35 315 32.8 369 -35 325 32.1 370 -35 335 29.6 371 -35 345 30.1 372 -35 355 31.4 378 -45 55 25.6 379 -45 65 19.4 380 -45 75 34.2 386 -45 135 42.0 387 -45 145 33.1 388 -45 155 29.7 389 -45 165 28.5 390 -45 175 28.9 391 -45 185 22.1 392 -45 195 28.2 393 -45 205 20.3 394 -45 215 23.4 396 -45 235 32.6 397 -45 245 22.6 398 -45 255 19.2 400 -45 275 15.3 401 -45 285 19.8 402 -45 295 39.7 403 -45 305 31.5 404 -45 315 34.7 405 -45 325 33.3 406 -45 335 25.7 417 -55 170 36.4 423 -55 290 36.5 424 -55 310 23.3 425 -55 330 16.4