High Level (Cirriform) Frequency of Occurrence (%) July (1954 - 1997) Day, Ship Observations Only Global Average: 39.0 Zonal Averages 15 zones Lat.N Average 85 60.2 75 54.7 65 52.0 55 51.0 45 47.2 35 38.7 25 39.0 15 49.4 5 54.0 -5 38.9 -15 26.9 -25 25.9 -35 31.7 -45 33.5 -55 34.8 Grid Box Averages 336 filled boxes Box # Lat.N Lon.E Average 1 85 60 54.4 2 85 180 61.8 3 85 300 65.8 4 75 20 47.6 5 75 60 45.6 6 75 100 58.4 7 75 140 66.2 8 75 180 53.6 9 75 220 60.2 10 75 260 65.0 11 75 300 57.8 12 75 340 46.7 13 65 10 46.6 14 65 30 46.9 15 65 50 43.4 20 65 150 48.9 21 65 170 45.1 22 65 190 51.1 23 65 210 61.9 25 65 250 58.6 26 65 270 57.5 27 65 290 63.4 28 65 310 61.0 29 65 330 50.6 30 65 350 47.5 31 55 10 46.3 32 55 30 42.5 37 55 130 45.2 38 55 150 47.6 39 55 170 47.9 40 55 190 52.4 41 55 210 52.9 42 55 230 51.6 44 55 270 55.0 45 55 290 66.6 46 55 310 55.6 47 55 330 48.4 48 55 350 51.2 49 45 5 31.1 50 45 15 19.6 51 45 25 9.2 52 45 35 12.6 53 45 45 23.3 54 45 55 24.7 62 45 135 51.5 63 45 145 49.0 64 45 155 54.2 65 45 165 55.5 66 45 175 54.6 67 45 185 59.3 68 45 195 56.2 69 45 205 52.7 70 45 215 48.8 71 45 225 42.6 72 45 235 34.9 77 45 285 47.0 78 45 295 53.4 79 45 305 52.2 80 45 315 49.2 81 45 325 43.8 82 45 335 40.3 83 45 345 36.8 84 45 355 36.6 85 35 5 19.9 86 35 15 11.1 87 35 25 5.9 88 35 35 6.4 90 35 55 30.4 96 35 115 37.9 97 35 125 49.5 98 35 135 59.8 99 35 145 57.4 100 35 155 56.9 101 35 165 57.8 102 35 175 49.5 103 35 185 47.4 104 35 195 45.0 105 35 205 41.1 106 35 215 35.1 107 35 225 29.6 108 35 235 23.1 109 35 245 22.3 112 35 275 61.4 113 35 285 52.2 114 35 295 48.1 115 35 305 42.0 116 35 315 36.5 117 35 325 30.2 118 35 335 24.9 119 35 345 16.2 120 35 355 17.3 124 25 35 15.8 125 25 45 8.8 126 25 55 22.9 127 25 65 36.9 129 25 85 68.5 131 25 105 57.9 132 25 115 55.7 133 25 125 55.6 134 25 135 60.3 135 25 145 58.0 136 25 155 52.9 137 25 165 50.6 138 25 175 44.5 139 25 185 41.5 140 25 195 35.0 141 25 205 29.9 142 25 215 28.7 143 25 225 27.0 144 25 235 28.8 145 25 245 39.3 146 25 255 59.3 147 25 265 54.5 148 25 275 59.4 149 25 285 49.8 150 25 295 39.4 151 25 305 30.2 152 25 315 22.8 153 25 325 18.1 154 25 335 17.0 155 25 345 18.0 160 15 35 28.7 161 15 45 32.4 162 15 55 34.1 163 15 65 46.8 164 15 75 58.4 165 15 85 62.3 166 15 95 66.5 167 15 105 70.4 168 15 115 63.7 169 15 125 65.1 170 15 135 68.6 171 15 145 64.3 172 15 155 58.4 173 15 165 52.7 174 15 175 48.8 175 15 185 44.8 176 15 195 41.5 177 15 205 33.1 178 15 215 37.4 179 15 225 40.5 180 15 235 45.1 181 15 245 51.7 182 15 255 68.1 183 15 265 71.6 184 15 275 64.9 185 15 285 51.6 186 15 295 44.6 187 15 305 35.3 188 15 315 31.1 189 15 325 30.5 190 15 335 33.2 191 15 345 41.7 193 5 5 42.3 197 5 45 41.1 198 5 55 43.4 199 5 65 58.0 200 5 75 65.0 201 5 85 67.5 202 5 95 72.6 203 5 105 64.6 204 5 115 67.7 205 5 125 66.5 206 5 135 75.0 207 5 145 68.5 208 5 155 65.3 209 5 165 65.7 210 5 175 63.5 211 5 185 61.0 212 5 195 55.6 213 5 205 45.5 214 5 215 46.8 215 5 225 39.3 216 5 235 41.1 217 5 245 43.1 218 5 255 50.0 219 5 265 57.9 220 5 275 68.0 221 5 285 66.0 223 5 305 45.6 224 5 315 39.4 225 5 325 29.6 226 5 335 37.4 227 5 345 39.6 228 5 355 28.1 229 -5 5 25.0 230 -5 15 21.6 232 -5 35 21.3 233 -5 45 38.4 234 -5 55 52.7 235 -5 65 61.1 236 -5 75 61.4 237 -5 85 66.7 238 -5 95 63.2 239 -5 105 53.0 240 -5 115 48.0 241 -5 125 47.6 242 -5 135 45.1 243 -5 145 62.9 244 -5 155 62.5 245 -5 165 56.1 246 -5 175 58.6 247 -5 185 47.5 248 -5 195 40.6 249 -5 205 32.3 250 -5 215 24.9 251 -5 225 14.6 252 -5 235 12.8 253 -5 245 16.9 254 -5 255 25.4 255 -5 265 28.6 256 -5 275 27.9 260 -5 315 31.1 261 -5 325 25.9 262 -5 335 18.9 263 -5 345 16.1 264 -5 355 19.0 265 -15 5 15.5 266 -15 15 15.8 268 -15 35 11.3 269 -15 45 18.2 270 -15 55 20.0 271 -15 65 23.9 272 -15 75 35.4 273 -15 85 33.3 274 -15 95 39.2 275 -15 105 32.9 276 -15 115 26.7 277 -15 125 28.6 278 -15 135 36.2 279 -15 145 30.3 280 -15 155 35.8 281 -15 165 38.4 282 -15 175 36.4 283 -15 185 37.4 284 -15 195 30.7 285 -15 205 22.5 286 -15 215 21.6 287 -15 225 17.5 288 -15 235 20.3 289 -15 245 20.2 290 -15 255 19.3 291 -15 265 29.4 292 -15 275 23.9 293 -15 285 28.7 297 -15 325 30.9 298 -15 335 25.9 299 -15 345 22.6 300 -15 355 17.8 301 -25 5 18.7 302 -25 15 15.6 304 -25 35 14.3 305 -25 45 17.5 306 -25 55 17.8 307 -25 65 17.2 308 -25 75 15.4 309 -25 85 17.2 310 -25 95 15.5 311 -25 105 20.7 312 -25 115 16.9 315 -25 145 24.6 316 -25 155 21.5 317 -25 165 23.4 318 -25 175 30.5 319 -25 185 25.7 320 -25 195 27.7 321 -25 205 36.3 322 -25 215 36.3 323 -25 225 39.3 324 -25 235 32.3 325 -25 245 32.4 326 -25 255 43.2 327 -25 265 29.4 328 -25 275 21.4 329 -25 285 24.0 332 -25 315 39.0 333 -25 325 31.9 334 -25 335 28.7 335 -25 345 28.0 336 -25 355 27.0 337 -35 5 33.2 338 -35 15 25.6 339 -35 25 29.4 340 -35 35 22.0 341 -35 45 25.9 342 -35 55 23.2 343 -35 65 23.6 344 -35 75 22.4 345 -35 85 17.8 346 -35 95 22.9 347 -35 105 23.3 348 -35 115 28.5 349 -35 125 32.6 350 -35 135 36.6 351 -35 145 40.5 352 -35 155 31.6 353 -35 165 31.2 354 -35 175 30.8 355 -35 185 30.8 356 -35 195 26.9 357 -35 205 37.1 358 -35 215 34.8 359 -35 225 43.6 360 -35 235 51.8 362 -35 255 44.4 363 -35 265 42.3 364 -35 275 23.1 365 -35 285 30.2 367 -35 305 39.8 368 -35 315 38.9 369 -35 325 38.1 370 -35 335 35.6 371 -35 345 35.3 372 -35 355 36.5 380 -45 75 41.2 387 -45 145 44.9 388 -45 155 39.9 389 -45 165 37.3 390 -45 175 37.9 391 -45 185 27.8 392 -45 195 31.4 393 -45 205 21.1 394 -45 215 24.8 396 -45 235 34.7 397 -45 245 32.3 398 -45 255 23.2 400 -45 275 23.5 401 -45 285 27.7 402 -45 295 45.9 403 -45 305 39.1 404 -45 315 40.4 405 -45 325 35.4 417 -55 170 43.1 423 -55 290 38.9 424 -55 310 34.8 425 -55 330 22.9