Steinbach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Steinbach 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
37%
16340
12%
46995
7%
16297
41%
16297
20%
33660

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
27%
899
7%
2685
5%
895
31%
895
12%
2150
January16th to endNight
25%
960
9%
2752
4%
960
29%
960
12%
2214
February1st to 15thNight
40%
876
10%
2317
6%
875
42%
875
18%
1746
February16th to endNight
35%
762
11%
2024
6%
762
39%
762
17%
1560
March1st to 15thNight
32%
620
14%
2060
9%
620
37%
620
17%
1450
March16th to endNight
36%
576
13%
2112
10%
576
44%
576
16%
1435
April1st to 15thNight
39%
539
16%
1720
14%
539
47%
539
24%
1109
April16th to endNight
39%
540
16%
1620
12%
540
44%
540
22%
1117
May1st to 15thNight
33%
540
12%
1503
4%
540
35%
540
23%
1046
May16th to endNight
39%
563
12%
1313
5%
561
41%
561
32%
908
June1st to 15thNight
42%
540
5%
1260
3%
540
45%
540
31%
871
June16th to endNight
52%
540
4%
1260
2%
540
54%
540
31%
869
July1st to 15thNight
60%
510
7%
1190
5%
510
62%
510
45%
738
July16th to endNight
62%
564
15%
1250
8%
531
64%
531
47%
751
August1st to 15thNight
61%
539
17%
1570
9%
536
64%
536
39%
899
August16th to endNight
56%
573
22%
1719
19%
573
62%
573
40%
943
September1st to 15thNight
52%
540
18%
1809
16%
540
59%
540
32%
1016
September16th to endNight
43%
537
19%
1980
17%
537
51%
537
23%
1200
October1st to 15thNight
30%
659
14%
2027
8%
659
35%
659
18%
1434
October16th to endNight
33%
828
12%
2236
5%
828
37%
828
20%
1646
November1st to 15thNight
25%
875
11%
2443
3%
875
30%
875
16%
1846
November16th to endNight
23%
900
10%
2565
5%
900
28%
900
13%
2048
December1st to 15thNight
28%
900
6%
2700
5%
900
30%
900
10%
2197
December16th to endNight
19%
960
6%
2880
3%
960
23%
960
7%
2467

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
13%9%46%6%35%5%5%7%32%
48228
Night
12%9%47%6%35%45%6%32%
47141
Cloud CoverDay
13%9%46%6%35%5%5%7%32%
48238
Night
12%9%47%6%35%45%6%32%
47144
Cloud CoverDay
14%8%36%6%35%5%5%6%33%
48239
Night
12%9%47%6%35%45%6%32%
47145
Cloud CoverDay
13%9%47%6%35%5%5%7%32%
48237
Night
11%10%47%6%35%5%5%6%32%
47145
TransparencyDay
49%6%14%21%6%
47892
Night
50%6%14%21%7%
46995
SeeingDay
16%8%29%27%14%3
6325
Night
16%6%29%32%12%1
16345

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%5%11%8%6%6%7%6%6%20%
1253
16th to endDay
11%12%8%11%11%5%7%7%7%5%10%
1470
February1st to 15thDay
7%9%5%8%9%6%8%7%7%7%23%
1545
16th to endDay
9%12%5%9%10%5%8%7%6%6%18%
1458
March1st to 15thDay
12%11%6%9%9%45%5%46%24%
1888
16th to endDay
12%11%47%9%46%5%47%25%
2112
April1st to 15thDay
12%10%46%6%35%446%36%
2224
16th to endDay
15%9%36%5%25%45%7%34%
2340
May1st to 15thDay
20%10%36%42345%5%32%
2446
16th to endDay
19%7%35%424447%35%
2801
June1st to 15thDay
18%7%35%5%35%5%5%7%30%
2700
16th to endDay
14%6%36%6%26%5%6%7%33%
2700
July1st to 15thDay
11%3245%35%5%6%9%42%
2700
16th to endDay
8%3244345%5%7%48%
2833
August1st to 15thDay
11%5%24435%5%6%7%44%
2382
16th to endDay
11%5%2342335%7%49%
2483
September1st to 15thDay
11%6%25%423347%46%
2149
16th to endDay
17%6%3442335%9%40%
1980
October1st to 15thDay
16%12%38%6%34346%31%
1719
16th to endDay
18%11%46%5%35%5%5%6%26%
1634
November1st to 15thDay
14%13%6%8%6%23436%30%
1415
16th to endDay
14%14%7%11%9%4444418%
1392
December1st to 15thDay
9%15%7%12%8%5%7%7%6%5%13%
1260
16th to endDay
13%15%8%12%10%35%45%5%14%
1344
January1st to 15thNight
7%13%7%11%10%5%8%6%6%5%18%
2685
16th to endNight
10%13%7%11%8%47%6%6%6%17%
2752
February1st to 15thNight
7%10%49%6%48%7%6%7%25%
2314
16th to endNight
9%11%5%10%9%46%6%45%26%
2024
March1st to 15thNight
11%12%5%8%6%34446%32%
2048
16th to endNight
13%10%47%5%25%5%6%6%33%
2112
April1st to 15thNight
9%8%46%6%35%45%6%40%
1720
16th to endNight
13%9%37%5%25%45%5%38%
1620
May1st to 15thNight
19%7%35%42435%7%36%
1503
16th to endNight
15%5%25%423448%42%
1312
June1st to 15thNight
14%5%244335%47%42%
1260
16th to endNight
11%335%6%3447%8%41%
1260
July1st to 15thNight
7%21333435%8%54%
1260
16th to endNight
7%212325%46%8%55%
1334
August1st to 15thNight
8%31332446%7%52%
1578
16th to endNight
9%313223447%56%
1719
September1st to 15thNight
10%5%2432435%6%52%
1809
16th to endNight
15%5%3342445%7%42%
1980
October1st to 15thNight
17%9%36%445%45%7%31%
2027
16th to endNight
17%10%37%6%33446%32%
2236
November1st to 15thNight
15%14%6%7%5%3335%5%30%
2443
16th to endNight
12%12%6%11%8%45%445%23%
2565
December1st to 15thNight
8%15%7%11%10%5%6%6%5%6%16%
2700
16th to endNight
14%16%7%12%10%5%5%44412%
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
8%12%5%11%8%5%6%7%6%6%20%
1254
16th to endDay
11%12%7%11%11%5%7%7%7%5%11%
1470
February1st to 15thDay
7%9%5%9%9%5%9%6%7%7%22%
1545
16th to endDay
9%12%5%10%9%6%8%7%5%6%18%
1458
March1st to 15thDay
12%12%6%9%9%45%5%5%5%24%
1899
16th to endDay
13%11%5%6%9%46%5%47%25%
2110
April1st to 15thDay
12%10%36%6%24446%36%
2224
16th to endDay
15%9%36%5%2445%8%33%
2340
May1st to 15thDay
21%10%36%4235%45%31%
2446
16th to endDay
19%7%35%42445%7%35%
2801
June1st to 15thDay
18%7%35%5%35%5%5%7%30%
2700
16th to endDay
15%6%35%6%36%5%6%8%33%
2700
July1st to 15thDay
11%324435%5%6%9%42%
2700
16th to endDay
8%324435%6%6%7%48%
2833
August1st to 15thDay
11%5%24435%5%6%8%43%
2382
16th to endDay
11%41343335%7%50%
2483
September1st to 15thDay
12%6%25%423447%46%
2149
16th to endDay
17%5%24423448%40%
1980
October1st to 15thDay
16%12%37%6%24346%31%
1719
16th to endDay
17%11%46%5%35%5%5%6%26%
1634
November1st to 15thDay
14%13%6%8%6%23335%31%
1415
16th to endDay
14%14%7%11%10%45%44419%
1392
December1st to 15thDay
9%16%7%11%8%5%7%7%5%6%14%
1260
16th to endDay
13%14%9%12%10%35%45%5%14%
1344
January1st to 15thNight
7%13%7%11%9%5%8%6%6%5%18%
2685
16th to endNight
10%13%7%11%8%47%7%6%6%17%
2752
February1st to 15thNight
7%10%49%7%47%7%6%6%25%
2307
16th to endNight
9%11%5%10%8%47%5%5%6%25%
2024
March1st to 15thNight
11%11%48%6%35%35%6%32%
2060
16th to endNight
13%10%47%425%5%5%6%33%
2110
April1st to 15thNight
9%8%46%5%25%45%7%40%
1720
16th to endNight
13%9%37%5%25%445%38%
1620
May1st to 15thNight
19%8%34423448%36%
1502
16th to endNight
16%5%25%423448%41%
1313
June1st to 15thNight
14%5%334345%47%43%
1260
16th to endNight
11%335%5%3446%9%41%
1260
July1st to 15thNight
7%21432436%8%55%
1260
16th to endNight
7%21232446%8%55%
1334
August1st to 15thNight
9%31332336%7%52%
1578
16th to endNight
9%313223447%56%
1719
September1st to 15thNight
10%424324447%51%
1809
16th to endNight
15%4244345%5%7%42%
1980
October1st to 15thNight
17%10%36%5%45%35%7%31%
2027
16th to endNight
16%11%37%5%3345%5%32%
2236
November1st to 15thNight
14%14%6%7%5%3335%430%
2443
16th to endNight
12%12%6%11%7%45%445%23%
2565
December1st to 15thNight
8%15%6%11%10%5%7%5%5%6%16%
2700
16th to endNight
14%16%7%12%10%5%6%5%4412%
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%5%11%7%5%6%7%6%7%20%
1253
16th to endDay
11%12%7%12%10%5%7%7%8%5%10%
1470
February1st to 15thDay
7%9%5%8%9%6%8%7%7%6%23%
1545
16th to endDay
9%12%5%10%8%5%8%6%6%5%19%
1458
March1st to 15thDay
12%12%6%9%9%35%5%45%24%
1899
16th to endDay
13%11%5%7%8%45%5%5%6%26%
2112
April1st to 15thDay
12%10%46%5%35%5%46%37%
2224
16th to endDay
15%9%36%435%45%6%34%
2340
May1st to 15thDay
21%10%35%423445%32%
2446
16th to endDay
20%6%35%424446%35%
2801
June1st to 15thDay
19%7%25%6%35%5%6%7%31%
2700
16th to endDay
15%5%26%5%36%5%5%7%34%
2700
July1st to 15thDay
12%314435%6%6%9%42%
2700
16th to endDay
9%314435%45%7%48%
2833
August1st to 15thDay
11%5%14435%5%6%7%44%
2382
16th to endDay
12%4135%24347%49%
2483
September1st to 15thDay
12%6%25%5%22347%46%
2149
16th to endDay
18%5%2442345%8%40%
1980
October1st to 15thDay
17%12%37%6%33336%31%
1719
16th to endDay
18%12%36%436%45%6%26%
1634
November1st to 15thDay
14%14%6%8%5%33435%31%
1415
16th to endDay
14%14%7%11%10%3444419%
1392
December1st to 15thDay
10%15%7%12%8%5%7%8%6%5%14%
1260
16th to endDay
14%15%8%12%10%45%45%5%14%
1344
January1st to 15thNight
7%13%7%10%10%5%8%6%5%5%18%
2685
16th to endNight
10%13%7%10%8%47%6%6%6%17%
2752
February1st to 15thNight
7%10%5%8%7%48%7%6%7%25%
2307
16th to endNight
9%10%5%10%9%47%5%45%26%
2024
March1st to 15thNight
12%10%5%8%6%35%446%32%
2060
16th to endNight
13%10%46%5%3446%6%33%
2112
April1st to 15thNight
10%8%36%5%4435%6%40%
1720
16th to endNight
14%9%37%5%24445%39%
1620
May1st to 15thNight
20%8%3442335%6%36%
1502
16th to endNight
16%5%34433447%42%
1312
June1st to 15thNight
15%5%244335%47%43%
1260
16th to endNight
12%325%6%25%46%8%42%
1260
July1st to 15thNight
8%22332345%8%55%
1260
16th to endNight
8%113225%36%8%55%
1334
August1st to 15thNight
9%32333346%7%52%
1578
16th to endNight
9%213323447%57%
1719
September1st to 15thNight
11%5%1342435%6%52%
1809
16th to endNight
16%42432445%7%42%
1980
October1st to 15thNight
18%9%35%5%35%45%7%31%
2027
16th to endNight
17%10%36%6%33446%31%
2236
November1st to 15thNight
15%14%7%6%42435%430%
2443
16th to endNight
13%12%6%11%8%45%445%24%
2565
December1st to 15thNight
8%15%7%11%10%5%6%6%5%6%16%
2700
16th to endNight
14%16%7%12%10%5%6%5%3412%
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
8%12%5%11%8%5%7%7%6%7%19%
1253
16th to endDay
11%12%7%11%11%5%6%8%7%5%10%
1470
February1st to 15thDay
7%9%48%10%6%8%6%7%7%23%
1545
16th to endDay
9%12%5%10%9%6%8%6%6%5%19%
1458
March1st to 15thDay
11%12%6%9%9%45%5%5%5%24%
1899
16th to endDay
12%11%47%8%46%6%47%26%
2110
April1st to 15thDay
11%9%46%6%34446%36%
2224
16th to endDay
15%8%37%5%345%5%7%33%
2340
May1st to 15thDay
20%10%46%5%23446%32%
2446
16th to endDay
19%7%45%424447%35%
2801
June1st to 15thDay
18%7%37%5%25%5%6%7%29%
2700
16th to endDay
14%6%36%5%45%6%6%7%33%
2700
July1st to 15thDay
11%424435%5%7%8%41%
2700
16th to endDay
8%4245%35%5%5%7%47%
2833
August1st to 15thDay
10%6%24335%5%7%8%42%
2382
16th to endDay
11%5%14423447%49%
2483
September1st to 15thDay
11%7%26%42335%7%45%
2149
16th to endDay
16%6%2442335%8%40%
1980
October1st to 15thDay
16%12%47%7%33445%30%
1719
16th to endDay
18%12%27%5%36%5%5%6%25%
1634
November1st to 15thDay
14%14%6%7%6%23436%30%
1415
16th to endDay
14%14%8%10%11%45%44419%
1392
December1st to 15thDay
9%16%6%12%8%47%8%5%5%13%
1260
16th to endDay
13%15%8%12%10%35%446%14%
1344
January1st to 15thNight
7%13%6%11%10%5%7%6%6%5%18%
2685
16th to endNight
10%13%7%10%8%47%7%6%6%17%
2752
February1st to 15thNight
7%10%5%9%6%49%7%6%6%25%
2307
16th to endNight
9%10%5%11%8%5%7%6%45%26%
2024
March1st to 15thNight
12%10%5%8%6%35%347%31%
2060
16th to endNight
13%9%47%5%25%46%7%32%
2112
April1st to 15thNight
9%8%35%6%35%45%7%40%
1720
16th to endNight
13%8%37%5%35%436%38%
1620
May1st to 15thNight
19%8%35%423447%36%
1502
16th to endNight
16%435%43346%7%41%
1312
June1st to 15thNight
14%6%24425%448%42%
1260
16th to endNight
11%325%6%35%5%5%8%41%
1260
July1st to 15thNight
6%32342435%8%54%
1260
16th to endNight
6%21232446%10%54%
1334
August1st to 15thNight
8%3134235%7%7%51%
1578
16th to endNight
9%312323447%56%
1719
September1st to 15thNight
10%5%14324447%51%
1809
16th to endNight
15%6%1442345%8%41%
1980
October1st to 15thNight
16%11%35%5%3445%7%31%
2027
16th to endNight
17%10%37%6%3445%5%31%
2236
November1st to 15thNight
14%15%6%7%5%2434429%
2443
16th to endNight
12%14%6%10%8%45%345%23%
2565
December1st to 15thNight
8%14%7%11%10%5%6%6%5%6%16%
2700
16th to endNight
14%16%8%13%10%5%6%5%4412%
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
59%7%13%15%4
1254
16th to endDay
69%5%8%12%2
1470
February1st to 15thDay
55%6%16%15%6%
1546
16th to endDay
62%5%11%15%5%
1458
March1st to 15thDay
60%7%12%15%4
1899
16th to endDay
57%7%11%17%4
2112
April1st to 15thDay
47%5%12%24%8%
2224
16th to endDay
48%414%20%9%2
2340
May1st to 15thDay
53%410%23%7%
2446
16th to endDay
48%5%10%22%11%1
2805
June1st to 15thDay
50%6%14%21%7%
2700
16th to endDay
46%7%17%22%4
2700
July1st to 15thDay
34%7%18%30%7%
2541
16th to endDay
34%6%20%28%9%
2655
August1st to 15thDay
36%8%19%28%6%
2366
16th to endDay
33%5%16%33%9%
2483
September1st to 15thDay
37%5%19%28%8%
2149
16th to endDay
41%5%18%28%5%
1980
October1st to 15thDay
53%5%14%20%6%
1719
16th to endDay
55%7%17%16%3
1634
November1st to 15thDay
55%5%16%16%41
1415
16th to endDay
68%6%11%11%3
1392
December1st to 15thDay
68%7%13%8%1
1260
16th to endDay
70%410%11%4
1344
January1st to 15thNight
62%7%10%15%4
2685
16th to endNight
63%6%11%14%3
2752
February1st to 15thNight
52%7%16%16%6%
2317
16th to endNight
57%5%13%17%5%
2024
March1st to 15thNight
52%5%13%21%7%
2060
16th to endNight
48%7%14%21%7%
2112
April1st to 15thNight
43%312%21%15%2
1720
16th to endNight
47%5%8%24%11%1
1620
May1st to 15thNight
47%412%24%10%
1503
16th to endNight
40%5%13%23%15%2
1313
June1st to 15thNight
40%6%15%26%10%1
1260
16th to endNight
37%9%21%23%6%1
1260
July1st to 15thNight
27%5%18%34%12%1
1190
16th to endNight
24%6%18%34%15%1
1250
August1st to 15thNight
27%6%19%34%9%1
1570
16th to endNight
26%5%17%35%14%1
1719
September1st to 15thNight
32%5%15%35%10%1
1809
16th to endNight
39%6%14%28%10%
1980
October1st to 15thNight
51%5%15%20%6%
2027
16th to endNight
52%5%16%22%2
2236
November1st to 15thNight
56%5%14%16%5%1
2443
16th to endNight
62%6%12%14%3
2565
December1st to 15thNight
65%6%13%12%1
2700
16th to endNight
73%48%10%2
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
8%10%30%35%14%1
90
16th to endDay
15%229%33%18%1
96
February1st to 15thDay
11%10%50%21%7%
90
16th to endDay
19%6%43%24%6%
81
March1st to 15thDay
15%8%30%33%12%
90
16th to endDay
19%11%31%19%11%6%
96
April1st to 15thDay
15%10%36%26%10%
343
16th to endDay
19%8%32%26%10%2
450
May1st to 15thDay
23%11%29%22%10%1
468
16th to endDay
22%9%26%26%12%2
517
June1st to 15thDay
18%10%28%25%11%4
495
16th to endDay
15%10%25%28%15%4
495
July1st to 15thDay
13%5%26%25%22%5%
475
16th to endDay
8%7%26%30%18%8%
515
August1st to 15thDay
11%425%28%20%8%
493
16th to endDay
12%5%27%30%17%5%
523
September1st to 15thDay
11%5%31%32%15%2
304
16th to endDay
17%12%39%17%10%2
135
October1st to 15thDay
20%9%25%34%9%
107
16th to endDay
32%5%32%19%8%2
96
November1st to 15thDay
21%10%23%32%12%1
90
16th to endDay
37%7%26%18%8%
90
December1st to 15thDay
18%224%36%15%2
90
16th to endDay
16%437%27%9%5%
96
January1st to 15thNight
13%7%33%31%11%2
900
16th to endNight
15%8%36%31%7%
960
February1st to 15thNight
11%6%26%37%15%1
880
16th to endNight
13%6%29%33%13%3
762
March1st to 15thNight
15%8%32%29%12%2
620
16th to endNight
18%7%28%28%13%3
576
April1st to 15thNight
12%7%33%34%10%1
539
16th to endNight
17%6%28%36%9%
540
May1st to 15thNight
22%6%32%27%10%
540
16th to endNight
16%8%29%33%11%
563
June1st to 15thNight
18%5%27%31%16%
540
16th to endNight
11%5%21%42%17%1
540
July1st to 15thNight
8%5%21%41%22%
510
16th to endNight
8%222%41%23%2
564
August1st to 15thNight
10%220%44%20%2
539
16th to endNight
11%324%35%22%2
573
September1st to 15thNight
13%326%35%18%2
540
16th to endNight
18%429%34%12%
537
October1st to 15thNight
22%8%32%29%7%
659
16th to endNight
21%7%30%28%10%
828
November1st to 15thNight
22%9%32%24%9%1
875
16th to endNight
19%9%36%25%7%1
900
December1st to 15thNight
14%6%31%33%11%1
900
16th to endNight
20%7%31%27%9%2
960
Page generated at 2017-10-07 13:07:56. Version ac04

Copyright 2017 A. Danko


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