Mean May Cloud Cover Along the Eclipse Track from Surface Observations
 

Description of Table:

Percent of Possible Sunshine: the average number of hours of sunshine per day as a fraction of the total possible from sunrise to sunset.

Percent Frequency of ____ Clouds: the 20-year average frequency of the six cloud categories. The categories are derived from surface observations of cloud cover by automatic weather stations and by humans. "Clear" is defined as no cloud whatsoever, "few" is 1-2 eights of sky cover (called oktas), "scattered" is 3-4 oktas, "broken" is 5-7 oktas, and "overcast" is complete sky cover. "Obscured" refers to a surface-based obstruction (usually fog) that makes the sky invisible.

Calculated Cloud Amount: an arithmetical combination of the cloud amounts in the previous six columns. Obscured is treated as overcast.

Monthy rainfall, days with rain, high and low temperatures: 20-30 year averages from surface weather observations.

 

 

Annular Solar Eclipse 2012 May 21/22
May Climate Statistics
Location Percent of possible sunshine Percent Frequency of _____ Clouds Calculated Average Cloud Amount Average Monthly Rainfall Days with Rain Average High Temperature  Average Low Temperature 
  % Clear Few Scattered Broken Overcast Obscured % (mm)   (°C) (°C)
China   0 0.15625 0.4375 0.78125 1 1          
Qinzhou   10 13.8 3.8 58.4 13.9 0.2 64        
Beihai   10.8 11 6.4 47 24.9 0 66        
Xinyi   10.4 8.6 6.6 63 11.3 0.2 65        
Yangjiang   7.5 9.2 5.4 46.3 31.6 0 72        
Shangchuan Dao   2 20.7 7.6 35.8 34 0 69        
Wuzhou   14.9 4.9 2.6 29.1 46.1 2.5 73 206 16 29 23
Gaoyao   7.5 9 4.4 38.8 40.3 0 74        
Hong Kong International 34 1.1 5 26.4 67.2 0.3 0 65 330 12 28 24
Guangzhou 31 4.9 6 4.1 45.4 39.6 0 78 284 14.4 29 23
Fogang   6.5 5.9 3.6 26.2 57.5 0.3 81        
Shanwei   9.9 10.2 2.2 34.6 43.1 0 73        
Heyuan   10.7 9.5 2.3 30.3 47 0.2 73        
Lianping   10.4 3.2 1.7 18.8 66 0 82        
Shantou 34 9.1 6.5 2.8 41.9 39.6 0.2 75 210 11.4 27 22
Mei Xian   13.8 9.2 1.3 22.3 53 0.5 73        
Xunwu   7.2 8.5 2.8 22.3 58.9 0.2 79        
Xiamen   9.2 7.6 2.5 30.8 46.7 3.2 76        
Yongan   6.3 9.4 4.1 20.6 59 0.7 79        
Jiuxian Shan   5 10.1 2.6 17.5 2 62.8 81        
Pingtan   3.3 9 1.8 25.8 57.8 2.3 82        
Fuzhou   5.9 9.5 3.8 33 47.4 0.5 77        
Macao
Taipa Grande 34 1.3 3.5 3 66 25.8 0.4 80 362 15 28 24
Taiwan
Mazu   0.6 8.1 9.5 20.2 55.8 5.8 83        
Taipei 27 0.3 14 6.5 26.3 52.8 0 78 259 16.1 29 22
Location Percent of possible sunshine Percent Frequency of _____ Clouds Calculated Average Cloud Amount Average Monthly Rainfall Days with Rain Average High Temperature  Average Low Temperature 
  % Clear Few Scattered Broken Overcast Obscured % (mm)   (°C) (°C)
Japan
Ushibuka   6.7 15.4 6.2 36.7 34.9 0.3 69        
Makurazaki   2.9 17.9 3.3 40.6 35.3 0 71 251 11.9 23 16
Kagoshima 40 3.1 17.3 6.7 43.6 29.2 0 69 232 11.7 25 16
Kagoshima/Ichiki   1.4 14.5 9.7 67.6 6.9 0 66        
Akune   7.6 15.8 5.2 37.9 33.6 0 68 204 11.1 23 15
Hitoyoshi 41 5.2 20.1 6.1 38 30.4 0.3 66 244 11.3 24 13
Miyakonojo   3.9 19.9 4.2 37.5 34.4 0 69        
Yakushima 35 2 12.8 3.9 47.7 33.6 0 75 505 14.7 24 17
Tanegashima Arpt   3.1 11.5 9.2 71.4 4.2 0.8 67        
Tanegashima 38 1.7 15.6 4.6 44.2 33.9 0 73 288 13.2 24 18
Aburatsu   4.2 19 5.3 33.4 38.1 0 69 315 12.6 23 16
Miyazaki  40 4.2 17.6 4.1 40.6 33.6 0 70 279 12.2 24 15
Nobeoka   7.2 19.3 3.6 37.7 32.2 0 66 276 11.9 24 14
Sukumo 42 5.6 18.6 3.6 47.5 24.7 0 66        
Uwajima   6.6 16.6 4.3 41.2 31.2 0 68 145 10.3 24 14
Shimizu 42 7.4 16.9 4.5 40.1 31.1 0 67 265 11.9 22 17
Kochi 42 6.4 19.5 3.6 39.4 31 0 66 263 11.2 24 15
Murotomisaki 42 4.4 18.2 3.9 39.3 23.8 10.4 69 275 13.7 21 16
Tokushima 45 7.4 15.8 4.1 43.7 29 0 67        
Tokushima AB   3.9 20.7 10.8 47.5 17 0 62 137 9.4 23 15
Komatsushima AB   3.2 18.5 11 53.2 13.6 0.3 63        
Sumoto 46 7.8 17.3 4 34.8 35.1 0.9 68 157 9.7 22 14
Wakayama 46 6.3 19 4.6 41.7 28.4 0 66 134 9.5 24 14
Kansai International   3.3 20.3 9.5 62.2 4.6 0 61        
Nankishirahama Arpt   0 18.3 12.6 65.9 2.8 0.3 63        
Shionomisaki   4.9 17.4 4.4 42.3 30.6 0.3 69 277 11.7 22 16
Kobe 44 7.3 15.7 3.7 41.7 31.7 0 68 144 9.8 23 14
Osaka International   1.1 17.9 10.8 64.9 5.4 0 64        
Osaka 44 7.7 13.2 5.2 44 29.9 0 69 139 9.7 24 15
Yao Airport   1.7 18.4 8.2 67.9 3.8 0 63        
Nara   6.5 15.9 4.3 44.5 28.6 0.2 68 127 9.8 24 12
Kyoto 40 7.2 14.4 3.4 47.1 27.9 0 68 154 10.2 24 13
Owase   6.3 16.2 5 40.7 31.8 0 68 339 12.2 23 13
Hikone   5 17.8 5.5 40.9 30.8 0 68 144 10.2 22 13
Tsu 43 5.9 15.2 6.7 37.4 34.8 0 69 162 10.2 22 14
Gifu 44 6.9 17.9 5.9 36.1 33.3 0 67 197 10.9 24 14
Gifu AB   4.5 17.7 10.6 58.5 8.7 0 62        
Nagoya A 43 1.9 18 10.8 61.4 7.9 0 63 143 10.4 20 9
Hamamatsu AB   3.8 15.8 7.9 60.3 12.3 0 65        
Hamamatsu   5.3 17.5 4.3 37.9 34.8 0.2 69 205 10.5 23 14
Omaezaki 44 5 17.4 4.4 39.4 31.9 1.8 69 216 10.2 21 15
Shizuoka   4.5 17.3 4.4 38.9 35 0 70 235 10.6 23 14
Shizuhama AB   3.5 17.5 7.3 58.9 12.7 0 65        
Iida 44 4.7 22.2 5.4 37.1 30.7 0 66 151 10.3 23 10
Matsumoto Arpt   0.3 23 12 56.3 8.4 0 61        
Kawaguchiko 38 2.7 22 4.7 38 32.6 0 68 107 9.3 20 8
Ajiro 39 3.8 17.9 4 35 39.1 0.2 71 172 10.4 22 15
Mishima   3.1 20.3 3.1 39.7 33.8 0 69 165 10.2 23 13
Irozaki   4 17.9 4.5 37.4 36 0.2 70 193 10.6 20 16
Miyakejima 39 3.1 12.1 4.2 44.4 36 0.2 75        
Oshima 38 2.1 18.8 3.4 40.6 33.6 1.5 71 275 11.6 20 14
Oshima Arpt   1.2 12 10.5 71.9 4.2 0.3 67        
Karuizawa   3.4 22.4 5.4 39.8 26.9 2.2 66 109 10.4 18 5
Atsugi NAS   3.3 12 10.4 57.5 16.7 0 68        
Yokohama 39 5.7 14.4 3 41.4 35.4 0 71 152 9.8 22 14
Yokosuka   11.9 10.7 8.7 22.6 46 0 69        
Tateyama   3.2 16.4 4.1 41 35.4 0 72 145 10.1 22 14
Chiba 38 5.9 14.8 4.4 40.3 34.6 0 70 96 8.8 22 14
Tokyo 38 7.2 14.8 4.9 36.9 36.3 0 70 128 9.6 23 15
Yokota (JASDF/USAF)   13 9.6 8.1 28 40.7 0.6 68        
Shimofusa AB   4.3 11.3 8.7 60.3 15.3 0 68        
Kumagaya   7.2 17 5 33.6 37.1 0 68 107 9.1 24 13
Maebashi 42 6.8 19.7 4.4 34.1 35 0 67 93 9.7 23 12
Utsunomiya 37 5.7 18 2.7 37.4 36.2 0 69 110 9.7 22 12
Mito   7 13.2 4.8 37.5 37.5 0 71 139 10.4 21 12
Hyakuri AB   4.3 12.4 9.3 48.4 25.5 0 69        
Choshi 40 4.1 14.4 3.9 39 36.7 2 73 141 10.2 20 14
Fukushima Arpt   0.6 18 10.1 67.8 3.2 0.3 64 84 8 23 11
Onahama   5.5 16.4 3.3 39.7 34.6 0.5 70 146 10.1 25 19
Location Percent of possible sunshine Percent Frequency of _____ Clouds Calculated Average Cloud Amount Average Monthly Rainfall Days with Rain Average High Temperature  Average Low Temperature 
  % Clear Few Scattered Broken Overcast Obscured % (mm)   (°C) (°C)
USA
Alaska  
Amchitka Island   0 6.4 0 18.3 68.8 6.4 90        
California  
Shelter Cove   36.9 14.5 4.1 14.5 24.4 5.5 45 67   19 9
Eureka 58 31.5 11.5 5.1 18.4 33.3 0.2 52 41 5.5 14 9
Arcata Airport   30.5 8.8 7.8 17.3 35.5 0.2 54     -18 -18
Redding Municipal Arpt* 91 53.6 9 6.8 14.7 15.8 0 32 42 8.0 27 11
Mount Shasta   60.2 4.2 5.5 16.9 13.1 0 29 47 7 20 4
Red Bluff Municipal   47.1 18.5 5.4 14.8 14.1 0 31 28   28 12
Chico Municipal Airport*   17.8 28.5 9.4 24.5 19.8 0 48 23   27 11
Oroville   85.4 3 1.3 2.3 8 0 11 25   27 11
Blue Canyon   50.5 7.5 5.2 8.6 25.3 2.9 38 74 7 16 7
Alturas*   57.3 9.6 5.6 10.9 16.6 0 29 34   20 1
Truckee-Tahoe*   17.2 23.4 7.9 30.1 21.4 0 52 34   18 0
Oregon  
Montague Siskiyou Aprt   44.3 21.9 2.9 15.7 15.2 0 32     -18 -18
Medford Rogue Valley   35 9.5 8.3 15.1 32.2 0 49 31 8 23 6
Klamath Falls Arpt   5.3 24.5 10.7 40.3 19.2 0 59 28   20 4
Nevada  
Reno Tahoe Arpt 81 13.9 17.6 15.6 32.6 20.3 0 55 18 2.8 23 5
Fallon NAAS   4.1 15.8 18.6 41.2 20.3 0 63 20   23 7
Lovelock Derby Field   35.8 13.5 9.8 21.8 19.2 0 43 17   23 5
Tonopah   38.1 13.8 9.5 22.8 15.8 0 40 16   23 6
Ely Yelland Field   35.1 10.9 6.8 24.9 22.3 0 46 29 5.4 20 1
Utah  
Saint George AWOS   77.2 11.2 2.2 6.4 2.9 0 11 10   31 13
Cedar City Municipal   40.9 12.1 7.7 20.9 18.3 0 40 23   22 5
Milford Municipal Ap 73 74.4 5.6 7 8.7 4.2 0 15 24 5 23 4
Bryce Canyon FAA   66.2 12.6 7.3 9.9 4 0 17 27   16 0
Arizona  
Grand Canyon Natl Park   42.8 23.6 8.8 15.8 8.8 0.2 29 16   21 2
Flagstaff Pulliam Arpt 88 42.1 18.1 8.4 19.6 11.8 0 34 20 4 20 1
Page Muni Arpt   85.6 4.7 3.9 3.6 2.2 0 7 10   26 11
Winslow Municipal Arpt   90.8 2.9 1.6 3.3 1.4 0 5 8 3 26 7
Window Rock   81.3 9.7 3.3 4 1.7 0 8 12   21 3
St John's Air Park   82.2 5.9 3.7 5.2 3 0 10 12   26 6
Colorado  
Cortez Montezuma Co.    56.7 16.1 2.2 13.2 11.9 0 26 28   22 3
New Mexico  
Gallup Senator Clark Field   43.7 15.3 9.7 15.4 15.9 0 35 16   24 1
Farmington Four Corners   40.7 26.6 2.3 25.3 5.2 0 30 14   24 6
Albuquerque Intl Arpt 79 11.1 15.8 24.6 33.4 15.1 0 54 13 2.6 27 9
Los Alamos   25.1 23.6 4.2 38.1 9.1 0 44 36   20 5
Santa Fe County   38.1 22.5 5.1 23.3 11.1 0 35 32   23 5
Clines Corner   83.6 6.3 3.8 3.8 2.4 0 8 41   22 4
Las Vegas Municipal Arpt   69.1 12.1 4.5 8.7 5.3 0.4 16 47   22 5
Sierra Blanca Regional   80.4 0.9 6.8 6.4 5.5 0 14 47      
Roswell Airpark 80 61.5 10.7 4.7 12.4 10.7 0 24 26 3.4 29 13
Clovis Muni Arpt   67.2 14 2.2 6.6 10 0 18 49   27 11
Hobbs/Lea County   26.2 15.9 25 29.8 3.2 0 40 52   30 13
Texas  
Lubbock 71 34.6 20.2 12.4 17.7 15.1 0 38 60 5.2 28 13
Midland 78 59 11 7.2 12.3 10.5 0 25 50 4.2 31 15
Abilene Regional  70 58.2 10 4.3 10.5 17 0 29 75 5.6 29 16 
Source: NCDC 
Updated: February 2009