High Level (Cirriform) Frequency of Occurrence (%) June (1954 - 1997) , Ship Observations Only Global Average: 34.4 Zonal Averages 15 zones Lat.N Average 85 49.5 75 49.8 65 46.2 55 44.9 45 43.1 35 39.1 25 34.2 15 40.8 5 48.9 -5 35.1 -15 24.0 -25 25.2 -35 27.4 -45 29.6 -55 24.6 Grid Box Averages 340 filled boxes Box # Lat.N Lon.E Average 1 85 60 41.1 2 85 180 55.0 3 85 300 53.0 4 75 20 40.2 5 75 60 45.2 6 75 100 47.6 8 75 180 52.3 9 75 220 62.5 10 75 260 55.3 11 75 300 56.1 12 75 340 40.4 13 65 10 40.6 14 65 30 43.7 15 65 50 43.3 20 65 150 48.2 21 65 170 38.9 22 65 190 45.8 23 65 210 40.4 27 65 290 56.4 28 65 310 54.0 29 65 330 47.6 30 65 350 41.7 31 55 10 43.6 32 55 30 45.7 37 55 130 42.5 38 55 150 43.1 39 55 170 41.5 40 55 190 46.0 41 55 210 46.2 42 55 230 46.4 45 55 290 41.1 46 55 310 46.5 47 55 330 43.7 48 55 350 48.0 49 45 5 42.1 50 45 15 37.5 51 45 25 30.1 52 45 35 22.4 53 45 45 26.3 54 45 55 22.3 62 45 135 41.3 63 45 145 38.8 64 45 155 45.9 65 45 165 43.9 66 45 175 44.0 67 45 185 45.8 68 45 195 48.8 69 45 205 48.1 70 45 215 46.8 71 45 225 38.5 72 45 235 33.9 77 45 285 47.6 78 45 295 51.1 79 45 305 48.0 80 45 315 46.1 81 45 325 39.1 82 45 335 40.9 83 45 345 41.3 84 45 355 40.5 85 35 5 31.9 86 35 15 26.2 87 35 25 15.6 88 35 35 10.2 89 35 45 23.9 90 35 55 26.9 96 35 115 34.2 97 35 125 45.2 98 35 135 56.3 99 35 145 50.2 100 35 155 48.1 101 35 165 52.4 102 35 175 48.3 103 35 185 47.5 104 35 195 48.0 105 35 205 44.0 106 35 215 38.9 107 35 225 28.7 108 35 235 22.8 109 35 245 16.8 112 35 275 50.0 113 35 285 48.9 114 35 295 46.8 115 35 305 40.5 116 35 315 36.2 117 35 325 32.0 118 35 335 29.6 119 35 345 22.6 120 35 355 28.8 124 25 35 11.3 125 25 45 7.8 126 25 55 11.4 127 25 65 22.3 128 25 75 30.6 129 25 85 59.0 131 25 105 59.2 132 25 115 52.3 133 25 125 53.2 134 25 135 56.1 135 25 145 47.6 136 25 155 42.3 137 25 165 39.6 138 25 175 39.0 139 25 185 33.5 140 25 195 30.6 141 25 205 28.5 142 25 215 24.8 143 25 225 25.3 144 25 235 22.6 145 25 245 22.3 146 25 255 31.4 147 25 265 39.3 148 25 275 46.1 149 25 285 50.6 150 25 295 42.7 151 25 305 33.2 152 25 315 26.9 153 25 325 21.6 154 25 335 16.4 155 25 345 17.3 160 15 35 20.9 161 15 45 27.1 162 15 55 29.0 163 15 65 37.4 164 15 75 52.9 165 15 85 60.0 166 15 95 65.0 167 15 105 63.7 168 15 115 56.0 169 15 125 53.4 170 15 135 51.3 171 15 145 46.5 172 15 155 40.4 173 15 165 36.5 174 15 175 36.5 175 15 185 38.8 176 15 195 34.4 177 15 205 32.2 178 15 215 35.1 179 15 225 28.7 180 15 235 24.1 181 15 245 34.2 182 15 255 50.6 183 15 265 65.6 184 15 275 60.8 185 15 285 51.6 186 15 295 41.9 187 15 305 35.9 188 15 315 29.9 189 15 325 28.9 190 15 335 26.0 191 15 345 30.9 193 5 5 48.2 197 5 45 38.8 198 5 55 38.2 199 5 65 51.7 200 5 75 55.8 201 5 85 62.9 202 5 95 71.8 203 5 105 61.4 204 5 115 64.3 205 5 125 63.3 206 5 135 67.9 207 5 145 58.5 208 5 155 56.5 209 5 165 48.8 210 5 175 58.1 211 5 185 49.9 212 5 195 47.7 213 5 205 39.3 214 5 215 36.9 215 5 225 37.6 216 5 235 34.3 217 5 245 36.7 218 5 255 43.1 219 5 265 52.2 220 5 275 64.9 221 5 285 64.5 223 5 305 45.2 224 5 315 38.7 225 5 325 31.0 226 5 335 34.7 227 5 345 39.4 228 5 355 36.4 229 -5 5 23.9 230 -5 15 14.7 232 -5 35 18.9 233 -5 45 29.1 234 -5 55 43.2 235 -5 65 52.1 236 -5 75 53.6 237 -5 85 60.9 238 -5 95 61.5 239 -5 105 50.4 240 -5 115 39.9 241 -5 125 41.7 242 -5 135 39.4 243 -5 145 50.3 244 -5 155 49.6 245 -5 165 49.9 246 -5 175 46.6 247 -5 185 48.9 248 -5 195 36.7 249 -5 205 32.7 250 -5 215 26.1 251 -5 225 15.1 252 -5 235 12.3 253 -5 245 15.0 254 -5 255 20.2 255 -5 265 23.9 256 -5 275 35.5 257 -5 285 25.5 260 -5 315 34.6 261 -5 325 23.8 262 -5 335 18.3 263 -5 345 15.0 264 -5 355 20.0 265 -15 5 13.2 266 -15 15 11.4 268 -15 35 10.4 269 -15 45 13.8 270 -15 55 19.9 271 -15 65 22.1 272 -15 75 29.2 273 -15 85 27.8 274 -15 95 38.3 275 -15 105 28.6 276 -15 115 23.2 277 -15 125 21.5 278 -15 135 24.6 279 -15 145 25.3 280 -15 155 28.6 281 -15 165 35.9 282 -15 175 33.1 283 -15 185 40.7 284 -15 195 31.7 285 -15 205 26.1 286 -15 215 23.8 287 -15 225 18.8 288 -15 235 15.7 289 -15 245 13.4 290 -15 255 16.1 291 -15 265 20.9 292 -15 275 22.8 293 -15 285 27.8 297 -15 325 29.4 298 -15 335 16.9 299 -15 345 19.2 300 -15 355 14.9 301 -25 5 16.9 302 -25 15 13.6 304 -25 35 12.0 305 -25 45 13.7 306 -25 55 14.4 307 -25 65 17.5 308 -25 75 15.9 309 -25 85 12.1 310 -25 95 15.7 311 -25 105 18.7 312 -25 115 18.1 315 -25 145 16.6 316 -25 155 20.9 317 -25 165 27.2 318 -25 175 30.4 319 -25 185 35.1 320 -25 195 31.9 321 -25 205 35.6 322 -25 215 40.5 323 -25 225 36.6 324 -25 235 31.1 325 -25 245 25.8 326 -25 255 26.7 327 -25 265 35.1 328 -25 275 19.9 329 -25 285 27.6 332 -25 315 36.1 333 -25 325 31.4 334 -25 335 31.6 335 -25 345 29.0 336 -25 355 22.0 337 -35 5 29.1 338 -35 15 24.7 339 -35 25 27.3 340 -35 35 18.9 341 -35 45 20.1 342 -35 55 24.0 343 -35 65 20.8 344 -35 75 19.1 345 -35 85 16.2 346 -35 95 16.9 347 -35 105 18.8 348 -35 115 22.2 349 -35 125 29.9 350 -35 135 32.1 351 -35 145 34.0 352 -35 155 29.0 353 -35 165 28.4 354 -35 175 25.8 355 -35 185 26.6 356 -35 195 28.0 357 -35 205 31.5 358 -35 215 30.9 359 -35 225 38.5 360 -35 235 40.4 361 -35 245 30.3 362 -35 255 36.8 363 -35 265 25.8 364 -35 275 19.1 365 -35 285 26.8 367 -35 305 38.0 368 -35 315 32.5 369 -35 325 33.4 370 -35 335 28.3 371 -35 345 35.5 372 -35 355 29.6 377 -45 45 29.6 380 -45 75 41.0 386 -45 135 43.9 387 -45 145 38.5 388 -45 155 31.3 389 -45 165 29.4 390 -45 175 26.8 391 -45 185 30.7 392 -45 195 32.9 393 -45 205 30.4 394 -45 215 25.3 395 -45 225 46.4 396 -45 235 26.5 397 -45 245 24.0 398 -45 255 19.3 399 -45 265 28.2 400 -45 275 17.1 401 -45 285 19.4 402 -45 295 33.0 403 -45 305 25.5 404 -45 315 22.6 405 -45 325 26.9 417 -55 170 25.4 423 -55 290 25.4 424 -55 310 32.5 425 -55 330 15.2