Elma
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Elma clear sky chart from 2005-11-05 to 2017-10-06.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
32%
16354
11%
46986
6%
16309
36%
16309
18%
34396

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 15thNight
22%
900
6%
2685
4%
895
25%
895
10%
2195
January16th to endNight
21%
960
7%
2784
2%
960
26%
960
11%
2273
February1st to 15thNight
32%
877
12%
2300
6%
875
36%
875
20%
1704
February16th to endNight
29%
789
11%
2051
5%
789
33%
789
18%
1582
March1st to 15thNight
31%
604
14%
2044
9%
604
38%
604
17%
1453
March16th to endNight
34%
576
15%
2112
12%
576
42%
576
17%
1410
April1st to 15thNight
35%
539
16%
1723
12%
539
44%
539
23%
1100
April16th to endNight
34%
540
16%
1620
10%
540
40%
540
22%
1099
May1st to 15thNight
29%
540
12%
1473
4%
540
33%
540
21%
1055
May16th to endNight
36%
563
10%
1327
5%
561
39%
561
30%
922
June1st to 15thNight
39%
540
4%
1260
2%
540
41%
540
29%
904
June16th to endNight
44%
540
3%
1260
2%
540
45%
540
27%
908
July1st to 15thNight
55%
510
6%
1190
4%
510
56%
510
43%
746
July16th to endNight
53%
564
13%
1239
7%
531
53%
531
43%
783
August1st to 15thNight
55%
539
16%
1559
9%
536
57%
536
34%
934
August16th to endNight
52%
573
21%
1719
16%
573
58%
573
36%
986
September1st to 15thNight
47%
540
15%
1797
16%
540
51%
540
29%
1066
September16th to endNight
35%
537
18%
1980
14%
537
44%
537
20%
1268
October1st to 15thNight
27%
677
12%
2045
7%
677
31%
677
16%
1503
October16th to endNight
25%
811
10%
2235
4%
811
29%
811
15%
1733
November1st to 15thNight
20%
875
8%
2451
2%
875
25%
875
13%
1923
November16th to endNight
18%
900
8%
2552
3%
900
23%
900
10%
2126
December1st to 15thNight
24%
900
4%
2700
2%
900
26%
900
9%
2251
December16th to endNight
17%
960
7%
2880
3%
960
22%
960
7%
2472

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
15%9%37%6%35%5%5%7%31%
48240
Night
13%10%47%6%35%5%5%6%31%
47131
Cloud CoverDay
14%9%47%6%35%45%6%31%
48250
Night
12%10%47%6%35%5%5%6%31%
47134
Cloud CoverDay
14%9%47%6%35%5%5%7%30%
48251
Night
12%10%47%6%35%5%5%6%31%
47135
Cloud CoverDay
15%9%47%6%35%5%5%6%31%
48249
Night
12%10%47%6%35%45%6%31%
47135
TransparencyDay
52%7%13%19%6%
47902
Night
52%6%13%19%7%
46986
SeeingDay
18%12%32%23%10%2
6336
Night
17%8%33%28%10%1
16357

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
9%11%7%9%7%47%8%7%6%18%
1253
16th to endDay
11%15%7%12%9%5%7%7%8%410%
1437
February1st to 15thDay
8%9%48%9%47%7%7%10%23%
1563
16th to endDay
7%11%7%10%9%46%6%5%5%23%
1434
March1st to 15thDay
12%13%5%9%7%345%45%27%
1904
16th to endDay
12%12%48%7%35%447%30%
2112
April1st to 15thDay
13%9%36%42445%6%37%
2222
16th to endDay
15%10%36%5%35%346%34%
2340
May1st to 15thDay
20%10%36%5%23446%31%
2476
16th to endDay
22%7%25%5%24446%35%
2786
June1st to 15thDay
20%5%36%6%37%45%7%30%
2700
16th to endDay
18%5%25%6%36%46%8%30%
2700
July1st to 15thDay
12%5%25%6%25%5%6%9%40%
2700
16th to endDay
12%5%244245%6%8%44%
2845
August1st to 15thDay
13%5%25%5%35%5%7%8%37%
2391
16th to endDay
13%424433447%46%
2483
September1st to 15thDay
14%6%35%424446%42%
2162
16th to endDay
20%7%15%423447%38%
1974
October1st to 15thDay
20%15%36%6%33345%29%
1706
16th to endDay
20%13%36%6%35%45%6%23%
1634
November1st to 15thDay
16%16%5%7%5%23345%27%
1407
16th to endDay
14%15%5%11%8%35%445%20%
1407
December1st to 15thDay
11%14%6%14%8%5%5%6%6%6%12%
1260
16th to endDay
13%16%8%14%9%336%5%5%13%
1344
January1st to 15thNight
8%13%7%10%9%5%9%7%6%5%15%
2685
16th to endNight
11%14%6%10%7%5%8%6%7%6%15%
2784
February1st to 15thNight
7%11%47%7%47%6%5%7%28%
2297
16th to endNight
10%10%411%9%35%6%46%27%
2051
March1st to 15thNight
8%12%5%8%7%35%446%34%
2032
16th to endNight
15%10%46%42345%6%35%
2112
April1st to 15thNight
11%8%345%25%45%7%40%
1723
16th to endNight
15%7%37%5%25%345%39%
1620
May1st to 15thNight
19%9%35%4235%5%5%36%
1473
16th to endNight
17%42442346%8%40%
1326
June1st to 15thNight
14%7%345%345%5%6%39%
1260
16th to endNight
14%3245%45%5%5%7%40%
1260
July1st to 15thNight
7%32332446%8%52%
1260
16th to endNight
8%21441345%8%54%
1323
August1st to 15thNight
9%32432446%7%51%
1566
16th to endNight
10%312314448%52%
1719
September1st to 15thNight
12%41433345%6%49%
1797
16th to endNight
20%5%24423447%40%
1980
October1st to 15thNight
17%12%26%5%3445%6%30%
2045
16th to endNight
20%13%35%6%34445%28%
2235
November1st to 15thNight
17%16%6%7%425%345%25%
2451
16th to endNight
13%16%7%10%9%45%345%20%
2552
December1st to 15thNight
9%13%7%12%10%5%7%6%5%6%15%
2700
16th to endNight
13%16%7%14%9%46%6%5%411%
2880

Percentage Cloud Cover NW (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
9%11%7%10%7%47%8%7%6%19%
1254
16th to endDay
10%15%7%11%10%5%8%7%8%410%
1437
February1st to 15thDay
8%8%48%8%5%8%7%6%8%23%
1563
16th to endDay
7%11%7%10%9%5%6%5%5%6%23%
1434
March1st to 15thDay
12%13%6%8%8%345%45%27%
1915
16th to endDay
12%12%48%7%35%447%29%
2110
April1st to 15thDay
13%9%46%5%2445%6%38%
2222
16th to endDay
15%9%36%6%35%446%34%
2340
May1st to 15thDay
20%9%36%434346%31%
2476
16th to endDay
20%7%25%5%34446%34%
2786
June1st to 15thDay
20%6%35%7%36%45%7%29%
2700
16th to endDay
18%6%35%6%36%5%6%8%30%
2700
July1st to 15thDay
11%435%5%35%5%5%8%41%
2700
16th to endDay
11%5%25%425%5%6%8%44%
2845
August1st to 15thDay
12%5%26%6%35%5%7%7%37%
2391
16th to endDay
13%42443435%7%45%
2483
September1st to 15thDay
14%6%26%424446%42%
2162
16th to endDay
19%7%25%42335%6%38%
1974
October1st to 15thDay
19%14%36%5%33345%29%
1706
16th to endDay
19%14%46%6%35%45%6%23%
1634
November1st to 15thDay
15%17%5%8%5%23345%27%
1407
16th to endDay
15%15%6%11%8%36%435%19%
1407
December1st to 15thDay
10%15%6%13%9%5%6%6%7%7%12%
1260
16th to endDay
13%15%8%15%7%335%5%6%14%
1344
January1st to 15thNight
8%13%7%10%9%6%8%6%6%5%15%
2685
16th to endNight
11%13%7%10%7%5%7%6%7%7%15%
2784
February1st to 15thNight
7%11%47%7%47%7%5%7%28%
2290
16th to endNight
9%9%5%10%9%46%5%5%6%26%
2051
March1st to 15thNight
9%10%6%9%7%25%347%33%
2044
16th to endNight
14%10%36%42345%7%35%
2110
April1st to 15thNight
11%8%35%5%3445%7%40%
1723
16th to endNight
14%7%46%5%24336%39%
1620
May1st to 15thNight
18%9%35%42345%6%36%
1472
16th to endNight
16%5%2442336%8%40%
1327
June1st to 15thNight
14%7%26%4345%5%7%38%
1260
16th to endNight
14%315%435%5%6%8%40%
1260
July1st to 15thNight
7%31333436%8%52%
1260
16th to endNight
8%31342345%9%53%
1323
August1st to 15thNight
8%315%3245%5%8%50%
1566
16th to endNight
10%41232345%9%52%
1719
September1st to 15thNight
12%425%333447%48%
1797
16th to endNight
19%5%25%5%1345%6%40%
1980
October1st to 15thNight
17%11%36%5%3445%6%30%
2045
16th to endNight
19%13%36%6%33446%27%
2235
November1st to 15thNight
16%16%5%7%5%25%445%26%
2451
16th to endNight
13%15%7%11%8%45%34420%
2552
December1st to 15thNight
9%13%7%12%11%5%7%6%5%6%15%
2700
16th to endNight
13%16%8%14%8%46%7%5%411%
2880

Percentage Cloud Cover SW (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
9%11%8%9%8%39%8%7%6%18%
1253
16th to endDay
10%15%7%12%9%5%7%7%9%49%
1437
February1st to 15thDay
7%9%48%8%5%8%7%7%9%22%
1563
16th to endDay
7%11%6%11%9%5%6%6%6%6%22%
1434
March1st to 15thDay
12%13%6%10%6%345%46%26%
1915
16th to endDay
12%12%5%8%7%35%447%29%
2112
April1st to 15thDay
12%9%36%5%2445%7%37%
2222
16th to endDay
14%10%36%6%35%447%34%
2340
May1st to 15thDay
19%10%36%5%2435%6%30%
2476
16th to endDay
20%7%35%5%34446%34%
2786
June1st to 15thDay
19%6%26%6%36%45%7%29%
2700
16th to endDay
17%6%36%6%45%5%6%8%30%
2700
July1st to 15thDay
11%5%25%5%35%5%6%9%39%
2700
16th to endDay
11%5%145%245%6%8%43%
2845
August1st to 15thDay
12%5%35%6%35%5%7%8%35%
2391
16th to endDay
13%42443445%8%45%
2483
September1st to 15thDay
13%7%36%5%2435%6%41%
2162
16th to endDay
19%7%25%42435%7%37%
1974
October1st to 15thDay
19%15%36%6%23345%28%
1706
16th to endDay
19%14%36%5%45%45%6%22%
1634
November1st to 15thDay
16%16%6%8%5%33345%26%
1407
16th to endDay
14%16%6%10%8%44446%20%
1407
December1st to 15thDay
10%14%6%13%10%5%6%6%6%6%12%
1260
16th to endDay
13%15%9%14%9%236%5%5%13%
1344
January1st to 15thNight
7%14%7%10%9%5%9%6%6%5%15%
2685
16th to endNight
11%14%6%10%7%5%7%6%8%6%14%
2784
February1st to 15thNight
7%11%47%7%47%7%5%7%28%
2290
16th to endNight
9%10%410%9%36%6%5%5%27%
2051
March1st to 15thNight
8%11%6%9%7%34446%33%
2044
16th to endNight
14%10%46%4235%5%6%35%
2112
April1st to 15thNight
11%7%345%345%5%7%40%
1723
16th to endNight
14%7%47%5%34345%39%
1620
May1st to 15thNight
17%9%35%42445%5%35%
1472
16th to endNight
17%5%25%43346%8%40%
1326
June1st to 15thNight
13%7%25%5%345%5%6%38%
1260
16th to endNight
13%425%5%35%5%5%8%39%
1260
July1st to 15thNight
8%31332346%9%52%
1260
16th to endNight
7%31342345%9%53%
1323
August1st to 15thNight
9%314425%46%7%50%
1566
16th to endNight
9%41332445%8%52%
1719
September1st to 15thNight
12%5%2442435%7%48%
1797
16th to endNight
19%5%25%42345%7%40%
1980
October1st to 15thNight
17%11%36%5%3445%6%30%
2045
16th to endNight
20%12%36%6%34445%27%
2235
November1st to 15thNight
16%15%6%7%5%35%445%25%
2451
16th to endNight
12%16%7%10%9%45%345%20%
2552
December1st to 15thNight
8%13%7%12%10%6%8%5%46%15%
2700
16th to endNight
13%16%8%13%9%46%6%5%410%
2880

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
9%11%8%9%8%48%8%7%6%17%
1253
16th to endDay
11%16%7%12%9%47%7%8%49%
1437
February1st to 15thDay
7%9%48%8%49%8%6%9%22%
1563
16th to endDay
8%11%7%11%8%5%7%6%6%5%21%
1434
March1st to 15thDay
12%13%6%9%7%445%46%25%
1915
16th to endDay
13%12%48%6%35%447%29%
2110
April1st to 15thDay
12%8%46%5%2435%6%37%
2222
16th to endDay
15%9%36%6%35%45%5%35%
2340
May1st to 15thDay
20%10%36%5%34445%31%
2476
16th to endDay
21%6%35%424446%34%
2786
June1st to 15thDay
19%6%36%6%45%5%5%7%29%
2700
16th to endDay
18%6%36%6%35%5%6%8%30%
2700
July1st to 15thDay
12%425%5%25%5%6%8%41%
2700
16th to endDay
12%42443445%9%43%
2845
August1st to 15thDay
13%5%26%5%35%5%6%7%35%
2391
16th to endDay
13%42442445%7%45%
2483
September1st to 15thDay
14%7%26%5%24446%41%
2162
16th to endDay
20%6%25%42435%7%37%
1974
October1st to 15thDay
20%15%36%5%23345%28%
1706
16th to endDay
20%14%5%5%6%3446%5%22%
1634
November1st to 15thDay
16%17%6%7%5%23345%26%
1407
16th to endDay
14%15%5%11%8%35%446%20%
1407
December1st to 15thDay
11%15%6%12%9%5%7%7%5%6%12%
1260
16th to endDay
13%16%8%14%8%345%6%413%
1344
January1st to 15thNight
7%15%7%10%9%6%8%7%7%5%15%
2685
16th to endNight
10%15%6%10%7%5%7%7%9%5%14%
2784
February1st to 15thNight
7%11%47%6%47%6%6%7%28%
2290
16th to endNight
9%11%5%10%8%45%5%5%6%27%
2051
March1st to 15thNight
8%12%6%8%6%34446%33%
2044
16th to endNight
14%9%46%5%1345%6%36%
2112
April1st to 15thNight
11%8%3443446%7%41%
1723
16th to endNight
14%8%36%5%35%345%39%
1620
May1st to 15thNight
18%8%35%424446%35%
1472
16th to endNight
17%5%245%1436%8%39%
1326
June1st to 15thNight
14%7%35%5%345%47%38%
1260
16th to endNight
13%425%5%36%5%6%8%37%
1260
July1st to 15thNight
8%31343445%8%53%
1260
16th to endNight
8%31342445%8%54%
1323
August1st to 15thNight
9%3145%2445%7%50%
1566
16th to endNight
10%41332335%8%52%
1719
September1st to 15thNight
12%5%24423347%49%
1797
16th to endNight
19%5%24423447%40%
1980
October1st to 15thNight
17%11%37%5%35%446%30%
2045
16th to endNight
20%12%37%6%34445%27%
2235
November1st to 15thNight
17%15%6%7%5%34445%25%
2451
16th to endNight
12%16%7%11%8%45%345%19%
2552
December1st to 15thNight
8%13%7%12%10%6%7%5%5%6%15%
2700
16th to endNight
13%16%8%14%8%46%5%6%410%
2880

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
60%7%13%14%2
1254
16th to endDay
69%6%7%12%2
1437
February1st to 15thDay
53%7%14%17%6%
1564
16th to endDay
60%6%11%14%7%
1434
March1st to 15thDay
58%6%12%15%6%
1915
16th to endDay
54%6%15%16%5%1
2112
April1st to 15thDay
45%5%12%23%10%
2222
16th to endDay
50%5%11%20%11%1
2340
May1st to 15thDay
54%5%10%21%7%
2476
16th to endDay
49%7%9%19%12%1
2790
June1st to 15thDay
53%7%11%18%8%
2700
16th to endDay
51%8%16%18%5%
2700
July1st to 15thDay
38%7%16%29%8%
2541
16th to endDay
37%8%18%25%9%
2666
August1st to 15thDay
43%9%17%23%5%
2374
16th to endDay
37%7%16%30%8%
2483
September1st to 15thDay
44%6%16%25%6%
2162
16th to endDay
46%7%15%26%3
1974
October1st to 15thDay
58%5%13%18%4
1706
16th to endDay
61%8%15%12%2
1634
November1st to 15thDay
60%6%13%14%31
1407
16th to endDay
65%7%13%10%2
1407
December1st to 15thDay
69%8%12%7%1
1260
16th to endDay
69%5%8%12%2
1344
January1st to 15thNight
65%6%10%13%3
2685
16th to endNight
64%6%11%13%2
2784
February1st to 15thNight
51%6%16%18%7%
2300
16th to endNight
56%6%14%17%5%
2051
March1st to 15thNight
51%6%12%18%10%
2044
16th to endNight
47%7%13%22%8%1
2112
April1st to 15thNight
41%5%12%21%15%2
1723
16th to endNight
47%49%20%15%2
1620
May1st to 15thNight
48%6%11%22%10%
1473
16th to endNight
41%5%13%22%14%2
1327
June1st to 15thNight
42%7%16%20%11%1
1260
16th to endNight
41%10%19%20%7%1
1260
July1st to 15thNight
27%7%18%35%10%1
1190
16th to endNight
27%7%17%33%12%1
1239
August1st to 15thNight
30%8%18%32%8%
1559
16th to endNight
29%6%18%33%11%
1719
September1st to 15thNight
35%6%16%31%9%
1797
16th to endNight
43%6%15%25%9%
1980
October1st to 15thNight
53%7%15%17%6%
2045
16th to endNight
58%6%14%18%2
2235
November1st to 15thNight
61%5%14%13%4
2451
16th to endNight
67%6%11%11%2
2552
December1st to 15thNight
68%6%14%9%1
2700
16th to endNight
73%5%8%9%3
2880

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
413%34%36%11%
90
16th to endDay
20%8%27%35%7%1
96
February1st to 15thDay
13%17%52%12%4
90
16th to endDay
17%16%43%18%31
81
March1st to 15thDay
12%16%37%21%11%1
90
16th to endDay
19%13%30%27%7%2
96
April1st to 15thDay
13%16%38%22%8%
341
16th to endDay
20%15%31%24%6%1
450
May1st to 15thDay
25%16%32%16%7%1
468
16th to endDay
23%12%29%22%10%1
517
June1st to 15thDay
21%14%30%19%9%3
495
16th to endDay
19%12%29%22%11%4
495
July1st to 15thDay
13%9%33%23%16%4
475
16th to endDay
11%11%31%23%14%6%
515
August1st to 15thDay
10%9%31%26%15%6%
493
16th to endDay
14%9%29%28%14%3
523
September1st to 15thDay
16%9%32%28%11%1
317
16th to endDay
21%20%34%14%7%1
135
October1st to 15thDay
25%12%28%27%6%
107
16th to endDay
34%11%26%22%32
96
November1st to 15thDay
25%8%31%25%8%
90
16th to endDay
33%15%32%11%6%1
90
December1st to 15thDay
10%441%31%12%1
90
16th to endDay
22%8%40%16%7%4
96
January1st to 15thNight
13%12%35%27%9%1
900
16th to endNight
18%10%38%26%4
960
February1st to 15thNight
12%8%34%32%11%
880
16th to endNight
13%8%36%28%9%2
789
March1st to 15thNight
14%10%35%27%11%
604
16th to endNight
19%10%29%24%12%3
576
April1st to 15thNight
15%10%33%30%9%
539
16th to endNight
17%7%33%33%7%
540
May1st to 15thNight
21%9%34%26%7%
540
16th to endNight
18%9%33%27%10%
563
June1st to 15thNight
18%6%29%31%13%
540
16th to endNight
16%5%26%33%16%1
540
July1st to 15thNight
10%328%38%18%1
510
16th to endNight
9%426%34%21%2
564
August1st to 15thNight
10%325%36%19%3
539
16th to endNight
12%5%26%33%19%2
573
September1st to 15thNight
13%5%30%33%15%2
540
16th to endNight
20%7%33%27%10%1
537
October1st to 15thNight
23%8%34%25%7%
677
16th to endNight
28%8%30%25%6%1
811
November1st to 15thNight
24%12%33%20%8%
875
16th to endNight
21%12%39%19%6%
900
December1st to 15thNight
14%8%37%30%8%1
900
16th to endNight
19%11%35%23%8%1
960
Page generated at 2017-10-07 13:07:56. Version ac04

Copyright 2017 A. Danko


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