High Level (Cirriform) Frequency of Occurrence (%) June (1954 - 1997) Day, Ship Observations Only Global Average: 39.3 Zonal Averages 15 zones Lat.N Average 85 50.6 75 49.8 65 45.3 55 48.3 45 47.2 35 42.8 25 38.9 15 46.5 5 54.9 -5 41.7 -15 29.4 -25 30.3 -35 32.4 -45 33.3 -55 29.5 Grid Box Averages 333 filled boxes Box # Lat.N Lon.E Average 1 85 60 47.0 2 85 180 55.6 3 85 300 48.2 4 75 20 40.3 5 75 60 47.5 8 75 180 51.1 9 75 220 59.9 10 75 260 60.4 11 75 300 57.6 12 75 340 36.4 13 65 10 42.2 14 65 30 42.8 15 65 50 44.7 20 65 150 46.9 21 65 170 41.5 22 65 190 47.8 23 65 210 45.5 29 65 330 48.4 30 65 350 44.0 31 55 10 46.8 32 55 30 45.8 37 55 130 47.2 38 55 150 44.6 39 55 170 44.7 40 55 190 48.8 41 55 210 49.5 42 55 230 51.3 46 55 310 50.9 47 55 330 47.4 48 55 350 51.8 49 45 5 47.5 50 45 15 37.2 51 45 25 25.3 52 45 35 21.7 53 45 45 29.6 54 45 55 24.8 62 45 135 45.8 63 45 145 45.9 64 45 155 51.1 65 45 165 46.7 66 45 175 47.3 67 45 185 50.3 68 45 195 50.7 69 45 205 50.0 70 45 215 51.2 71 45 225 45.0 72 45 235 41.2 77 45 285 48.4 78 45 295 51.8 79 45 305 51.5 80 45 315 51.9 81 45 325 47.3 82 45 335 44.9 83 45 345 43.8 84 45 355 44.1 85 35 5 35.5 86 35 15 26.4 87 35 25 15.6 88 35 35 11.1 89 35 45 21.7 90 35 55 26.5 96 35 115 41.3 97 35 125 47.6 98 35 135 60.8 99 35 145 55.3 100 35 155 54.4 101 35 165 56.9 102 35 175 51.6 103 35 185 50.8 104 35 195 48.3 105 35 205 45.4 106 35 215 43.3 107 35 225 34.4 108 35 235 27.7 109 35 245 19.6 112 35 275 55.8 113 35 285 49.0 114 35 295 48.0 115 35 305 46.3 116 35 315 43.4 117 35 325 37.9 118 35 335 35.1 119 35 345 24.6 120 35 355 32.0 124 25 35 12.7 125 25 45 5.7 126 25 55 12.1 127 25 65 24.6 128 25 75 31.6 129 25 85 59.4 131 25 105 62.1 132 25 115 61.2 133 25 125 60.9 134 25 135 62.5 135 25 145 55.2 136 25 155 49.7 137 25 165 45.3 138 25 175 43.1 139 25 185 38.5 140 25 195 31.2 141 25 205 32.3 142 25 215 29.9 143 25 225 31.8 144 25 235 27.9 145 25 245 26.6 146 25 255 36.6 147 25 265 43.3 148 25 275 50.2 149 25 285 51.1 150 25 295 46.7 151 25 305 39.9 152 25 315 32.1 153 25 325 25.5 154 25 335 19.5 155 25 345 19.7 160 15 35 22.3 161 15 45 29.9 162 15 55 34.3 163 15 65 44.1 164 15 75 58.0 165 15 85 62.2 166 15 95 62.3 167 15 105 68.4 168 15 115 64.4 169 15 125 62.5 170 15 135 58.7 171 15 145 54.0 172 15 155 48.3 173 15 165 44.0 174 15 175 38.9 175 15 185 41.1 176 15 195 35.5 177 15 205 39.2 178 15 215 42.5 179 15 225 38.3 180 15 235 33.7 181 15 245 40.7 182 15 255 57.1 183 15 265 70.1 184 15 275 64.5 185 15 285 53.5 186 15 295 49.3 187 15 305 43.7 188 15 315 37.0 189 15 325 31.4 190 15 335 30.5 191 15 345 36.8 193 5 5 50.7 197 5 45 45.6 198 5 55 46.0 199 5 65 60.3 200 5 75 65.0 201 5 85 68.2 202 5 95 73.6 203 5 105 65.7 204 5 115 70.9 205 5 125 68.6 206 5 135 73.8 207 5 145 67.5 208 5 155 66.6 209 5 165 58.9 210 5 175 63.5 211 5 185 53.6 212 5 195 53.6 213 5 205 47.0 214 5 215 46.5 215 5 225 41.5 216 5 235 38.5 217 5 245 39.4 218 5 255 49.0 219 5 265 55.2 220 5 275 67.3 221 5 285 67.0 223 5 305 53.5 224 5 315 45.7 225 5 325 36.2 226 5 335 41.3 227 5 345 46.6 228 5 355 41.2 229 -5 5 26.0 230 -5 15 18.8 232 -5 35 21.8 233 -5 45 36.8 234 -5 55 50.8 235 -5 65 61.5 236 -5 75 62.5 237 -5 85 68.3 238 -5 95 66.8 239 -5 105 58.7 240 -5 115 50.8 241 -5 125 51.2 242 -5 135 44.2 243 -5 145 61.4 244 -5 155 62.2 245 -5 165 60.1 246 -5 175 53.2 247 -5 185 53.3 248 -5 195 45.8 249 -5 205 42.6 250 -5 215 36.7 251 -5 225 22.8 252 -5 235 16.3 253 -5 245 20.1 254 -5 255 24.9 255 -5 265 26.9 256 -5 275 35.5 257 -5 285 27.3 260 -5 315 39.5 261 -5 325 29.7 262 -5 335 22.1 263 -5 345 19.5 264 -5 355 24.0 265 -15 5 14.4 266 -15 15 13.4 268 -15 35 15.1 269 -15 45 18.3 270 -15 55 25.5 271 -15 65 26.7 272 -15 75 37.5 273 -15 85 33.3 274 -15 95 42.0 275 -15 105 37.0 276 -15 115 28.6 277 -15 125 29.4 278 -15 135 33.2 279 -15 145 33.6 280 -15 155 36.3 281 -15 165 42.4 282 -15 175 35.9 283 -15 185 43.3 284 -15 195 39.1 285 -15 205 33.2 286 -15 215 30.2 287 -15 225 24.1 288 -15 235 19.2 289 -15 245 18.5 290 -15 255 21.4 291 -15 265 24.3 292 -15 275 26.9 293 -15 285 31.9 297 -15 325 35.2 298 -15 335 25.8 299 -15 345 25.6 300 -15 355 17.5 301 -25 5 18.5 302 -25 15 16.9 304 -25 35 16.0 305 -25 45 18.7 306 -25 55 19.2 307 -25 65 21.5 308 -25 75 17.7 309 -25 85 16.1 310 -25 95 20.6 311 -25 105 21.6 312 -25 115 23.4 315 -25 145 18.2 316 -25 155 26.1 317 -25 165 33.2 318 -25 175 34.8 319 -25 185 38.2 320 -25 195 40.2 321 -25 205 42.3 322 -25 215 49.7 323 -25 225 44.9 324 -25 235 37.6 325 -25 245 34.6 326 -25 255 32.4 327 -25 265 32.2 328 -25 275 25.0 329 -25 285 30.1 332 -25 315 42.3 333 -25 325 37.9 334 -25 335 36.0 335 -25 345 37.1 336 -25 355 28.1 337 -35 5 31.9 338 -35 15 29.5 339 -35 25 33.9 340 -35 35 24.6 341 -35 45 25.2 342 -35 55 26.4 343 -35 65 23.6 344 -35 75 26.1 345 -35 85 21.1 346 -35 95 22.6 347 -35 105 25.1 348 -35 115 30.3 349 -35 125 36.3 350 -35 135 38.7 351 -35 145 41.5 352 -35 155 35.4 353 -35 165 34.3 354 -35 175 32.6 355 -35 185 32.6 356 -35 195 32.3 357 -35 205 35.4 358 -35 215 36.8 359 -35 225 39.0 360 -35 235 40.3 362 -35 255 40.6 363 -35 265 31.9 364 -35 275 23.8 365 -35 285 31.7 367 -35 305 44.2 368 -35 315 39.9 369 -35 325 38.4 370 -35 335 32.9 371 -35 345 42.1 372 -35 355 37.0 380 -45 75 39.5 386 -45 135 47.6 387 -45 145 45.3 388 -45 155 38.7 389 -45 165 42.3 390 -45 175 36.2 391 -45 185 33.8 392 -45 195 30.7 393 -45 205 31.2 394 -45 215 28.7 395 -45 225 47.2 397 -45 245 25.9 398 -45 255 23.2 399 -45 265 30.1 400 -45 275 21.2 401 -45 285 15.5 402 -45 295 37.5 403 -45 305 31.0 404 -45 315 29.6 405 -45 325 27.4 417 -55 170 27.4 423 -55 290 29.4 424 -55 310 39.0 425 -55 330 22.3