High Level (Cirriform) Amount-When-Present (%) June, July, August (1954 - 1997) , Ship Observations Only Global Average: 34.1 Zonal Averages 15 zones Lat.N Average 85 36.5 75 37.9 65 33.3 55 34.4 45 34.0 35 32.8 25 30.5 15 36.6 5 35.5 -5 32.8 -15 29.7 -25 31.0 -35 35.8 -45 36.7 -55 37.8 Grid Box Averages 336 filled boxes Box # Lat.N Lon.E Average 1 85 60 28.1 2 85 180 45.2 3 85 300 33.3 4 75 20 32.7 5 75 60 32.2 6 75 100 33.3 7 75 140 45.1 8 75 180 44.8 9 75 220 40.5 10 75 260 35.1 11 75 300 32.5 12 75 340 32.8 13 65 10 30.6 14 65 30 31.7 15 65 50 31.7 16 65 70 39.3 20 65 150 28.6 21 65 170 34.4 22 65 190 33.5 23 65 210 29.4 24 65 230 35.3 25 65 250 38.0 26 65 270 34.3 27 65 290 36.6 28 65 310 32.4 29 65 330 31.1 30 65 350 34.5 31 55 10 33.5 32 55 30 34.4 37 55 130 28.1 38 55 150 32.3 39 55 170 34.6 40 55 190 34.2 41 55 210 32.3 42 55 230 30.8 44 55 270 33.2 45 55 290 36.0 46 55 310 36.1 47 55 330 39.2 48 55 350 33.3 49 45 5 32.8 50 45 15 32.1 51 45 25 36.1 52 45 35 34.6 53 45 45 26.9 54 45 55 33.3 62 45 135 35.8 63 45 145 36.4 64 45 155 31.8 65 45 165 32.4 66 45 175 35.5 67 45 185 39.8 68 45 195 33.2 69 45 205 33.4 70 45 215 32.3 71 45 225 32.5 72 45 235 30.1 77 45 285 38.9 78 45 295 37.3 79 45 305 35.4 80 45 315 37.0 81 45 325 32.6 82 45 335 32.5 83 45 345 30.4 84 45 355 30.6 85 35 5 34.2 86 35 15 33.9 87 35 25 34.4 88 35 35 33.3 90 35 55 32.0 96 35 115 37.0 97 35 125 38.8 98 35 135 40.3 99 35 145 34.8 100 35 155 32.6 101 35 165 39.7 102 35 175 31.2 103 35 185 30.8 104 35 195 29.5 105 35 205 28.7 106 35 215 29.2 107 35 225 31.8 108 35 235 29.0 109 35 245 31.9 112 35 275 36.9 113 35 285 38.6 114 35 295 34.6 115 35 305 30.5 116 35 315 29.7 117 35 325 26.6 118 35 335 27.7 119 35 345 30.8 120 35 355 32.2 124 25 35 36.5 125 25 45 44.0 126 25 55 49.2 127 25 65 51.0 129 25 85 39.4 131 25 105 44.6 132 25 115 35.2 133 25 125 34.0 134 25 135 31.9 135 25 145 28.4 136 25 155 30.1 137 25 165 29.8 138 25 175 28.8 139 25 185 27.8 140 25 195 28.3 141 25 205 29.1 142 25 215 30.2 143 25 225 29.7 144 25 235 28.0 145 25 245 27.3 146 25 255 29.2 147 25 265 28.4 148 25 275 28.3 149 25 285 30.9 150 25 295 29.9 151 25 305 28.4 152 25 315 26.5 153 25 325 27.1 154 25 335 40.5 155 25 345 44.5 160 15 35 43.0 161 15 45 48.8 162 15 55 46.9 163 15 65 46.4 164 15 75 47.4 165 15 85 44.0 166 15 95 47.0 167 15 105 53.3 168 15 115 36.5 169 15 125 35.4 170 15 135 33.1 171 15 145 30.6 172 15 155 34.0 173 15 165 39.2 174 15 175 34.1 175 15 185 33.0 176 15 195 33.5 177 15 205 28.0 178 15 215 30.2 179 15 225 28.4 180 15 235 31.6 181 15 245 30.1 182 15 255 33.1 183 15 265 36.5 184 15 275 35.5 185 15 285 36.5 186 15 295 34.4 187 15 305 36.0 188 15 315 35.8 189 15 325 38.6 190 15 335 47.8 191 15 345 50.2 193 5 5 36.7 197 5 45 38.0 198 5 55 39.9 199 5 65 42.2 200 5 75 45.3 201 5 85 42.5 202 5 95 44.6 203 5 105 40.8 204 5 115 40.1 205 5 125 36.9 206 5 135 37.0 207 5 145 31.0 208 5 155 30.8 209 5 165 35.8 210 5 175 33.3 211 5 185 31.2 212 5 195 32.6 213 5 205 28.5 214 5 215 25.5 215 5 225 30.2 216 5 235 25.6 217 5 245 30.9 218 5 255 34.8 219 5 265 33.5 220 5 275 38.7 221 5 285 43.7 223 5 305 30.5 224 5 315 29.5 225 5 325 28.2 226 5 335 34.6 227 5 345 38.5 228 5 355 35.0 229 -5 5 37.4 230 -5 15 43.9 232 -5 35 25.4 233 -5 45 31.3 234 -5 55 36.3 235 -5 65 41.1 236 -5 75 37.7 237 -5 85 36.8 238 -5 95 36.1 239 -5 105 36.5 240 -5 115 29.8 241 -5 125 30.1 242 -5 135 34.0 243 -5 145 35.0 244 -5 155 35.4 245 -5 165 32.7 246 -5 175 31.6 247 -5 185 28.0 248 -5 195 28.5 249 -5 205 23.3 250 -5 215 22.4 251 -5 225 20.2 252 -5 235 22.1 253 -5 245 26.5 254 -5 255 25.9 255 -5 265 26.5 256 -5 275 41.0 257 -5 285 42.4 260 -5 315 26.9 261 -5 325 25.3 262 -5 335 25.6 263 -5 345 31.9 264 -5 355 33.3 265 -15 5 32.9 266 -15 15 38.9 268 -15 35 25.8 269 -15 45 21.9 270 -15 55 24.9 271 -15 65 27.6 272 -15 75 31.9 273 -15 85 29.4 274 -15 95 29.1 275 -15 105 28.2 276 -15 115 26.2 277 -15 125 29.7 278 -15 135 32.3 279 -15 145 31.5 280 -15 155 29.8 281 -15 165 31.4 282 -15 175 31.8 283 -15 185 32.5 284 -15 195 27.6 285 -15 205 23.7 286 -15 215 25.5 287 -15 225 24.1 288 -15 235 26.8 289 -15 245 27.1 290 -15 255 22.8 291 -15 265 30.7 292 -15 275 44.4 293 -15 285 43.0 297 -15 325 27.7 298 -15 335 25.6 299 -15 345 28.8 300 -15 355 31.8 301 -25 5 30.1 302 -25 15 33.2 304 -25 35 30.0 305 -25 45 25.2 306 -25 55 24.5 307 -25 65 27.9 308 -25 75 29.3 309 -25 85 28.6 310 -25 95 25.9 311 -25 105 25.3 312 -25 115 27.2 315 -25 145 24.3 316 -25 155 26.2 317 -25 165 27.6 318 -25 175 30.4 319 -25 185 33.7 320 -25 195 36.3 321 -25 205 34.5 322 -25 215 31.6 323 -25 225 32.2 324 -25 235 31.4 325 -25 245 34.7 326 -25 255 30.1 327 -25 265 30.0 328 -25 275 31.8 329 -25 285 32.9 332 -25 315 34.3 333 -25 325 32.3 334 -25 335 32.5 335 -25 345 30.1 336 -25 355 30.7 337 -35 5 34.9 338 -35 15 35.7 339 -35 25 34.0 340 -35 35 33.1 341 -35 45 29.2 342 -35 55 31.9 343 -35 65 30.7 344 -35 75 29.3 345 -35 85 34.9 346 -35 95 36.0 347 -35 105 29.8 348 -35 115 33.0 349 -35 125 34.8 350 -35 135 38.2 351 -35 145 39.8 352 -35 155 33.0 353 -35 165 33.5 354 -35 175 34.8 355 -35 185 33.0 356 -35 195 38.0 357 -35 205 36.7 358 -35 215 40.6 359 -35 225 39.8 360 -35 235 38.8 364 -35 275 38.6 365 -35 285 39.1 367 -35 305 36.4 368 -35 315 41.6 369 -35 325 37.6 370 -35 335 36.9 371 -35 345 38.1 372 -35 355 35.0 380 -45 75 35.2 387 -45 145 37.8 388 -45 155 38.6 389 -45 165 39.6 390 -45 175 32.3 391 -45 185 29.7 392 -45 195 32.8 393 -45 205 30.7 394 -45 215 35.3 397 -45 245 43.4 398 -45 255 36.0 400 -45 275 46.2 401 -45 285 41.6 402 -45 295 38.7 403 -45 305 38.4 404 -45 315 38.0 405 -45 325 34.9 417 -55 170 40.2 423 -55 290 40.1 424 -55 310 35.3 425 -55 330 34.2