Lake of the Woods (North-East)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake of the Woods (North-East) clear sky chart from 2005-11-05 to

2017-09-12
.

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
30%
16270
11%
46701
6%
16224
35%
16224
16%
34137

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
25%
900
7%
2685
5%
895
28%
895
11%
2124
January16th to endNight
20%
960
9%
2782
2%
960
26%
960
11%
2205
February1st to 15thNight
29%
879
13%
2288
5%
876
34%
876
17%
1661
February16th to endNight
30%
789
13%
2051
6%
789
34%
789
16%
1560
March1st to 15thNight
26%
606
14%
2046
9%
606
33%
606
15%
1451
March16th to endNight
29%
576
16%
2112
11%
576
39%
576
15%
1391
April1st to 15thNight
31%
539
17%
1736
11%
539
42%
539
20%
1098
April16th to endNight
32%
540
17%
1620
8%
540
41%
540
19%
1097
May1st to 15thNight
28%
540
13%
1449
4%
540
32%
540
20%
1032
May16th to endNight
36%
563
10%
1369
5%
561
39%
561
24%
965
June1st to 15thNight
34%
540
4%
1260
3%
540
36%
540
25%
892
June16th to endNight
38%
540
3%
1260
2%
540
40%
540
22%
916
July1st to 15thNight
51%
510
7%
1190
5%
510
53%
510
37%
755
July16th to endNight
46%
564
15%
1250
6%
531
52%
531
38%
773
August1st to 15thNight
56%
539
18%
1554
10%
536
59%
536
32%
923
August16th to endNight
46%
573
21%
1719
14%
573
55%
573
32%
1006
September1st to 15thNight
42%
530
15%
1755
15%
530
48%
530
25%
1075
September16th to endNight
34%
506
17%
1829
15%
506
41%
506
20%
1181
October1st to 15thNight
24%
660
13%
1980
7%
660
30%
660
14%
1463
October16th to endNight
24%
781
9%
2227
3%
781
29%
781
12%
1750
November1st to 15thNight
19%
875
8%
2451
3%
875
23%
875
12%
1954
November16th to endNight
17%
900
8%
2520
3%
900
22%
900
7%
2145
December1st to 15thNight
22%
900
5%
2688
2%
900
24%
900
8%
2270
December16th to endNight
16%
960
8%
2880
3%
960
21%
960
6%
2450

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%47%6%35%45%6%31%
47990
Night
13%10%47%6%35%5%5%6%31%
46849
Cloud CoverDay
11%8%36%5%34445%42%
48000
Night
10%9%36%5%34445%42%
46852
Cloud CoverDay
14%9%47%6%35%5%5%6%31%
48001
Night
13%10%47%6%35%45%6%31%
46853
Cloud CoverDay
14%9%47%6%35%5%5%6%31%
47999
Night
13%10%47%6%35%45%6%31%
46853
TransparencyDay
51%7%13%19%7%
47655
Night
52%6%13%20%7%
46701
SeeingDay
17%16%27%24%11%3
6256
Night
15%20%25%25%10%1
16271

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
11%11%5%11%9%45%7%6%6%20%
1253
16th to endDay
13%12%6%13%8%5%7%6%7%5%12%
1441
February1st to 15thDay
7%8%5%9%8%47%6%7%8%26%
1575
16th to endDay
8%12%7%10%7%36%5%5%6%24%
1422
March1st to 15thDay
12%12%6%9%6%245%5%5%28%
1912
16th to endDay
14%11%5%7%6%34445%31%
2112
April1st to 15thDay
12%9%37%6%2435%6%37%
2211
16th to endDay
15%10%36%5%25%446%33%
2340
May1st to 15thDay
21%10%36%5%33446%30%
2502
16th to endDay
20%6%35%5%24446%35%
2743
June1st to 15thDay
18%5%25%6%26%46%7%32%
2700
16th to endDay
17%6%36%6%35%5%6%7%30%
2700
July1st to 15thDay
13%325%5%35%5%6%8%40%
2700
16th to endDay
10%5%14435%5%5%9%42%
2833
August1st to 15thDay
12%6%245%45%5%6%8%37%
2394
16th to endDay
14%5%245%2445%6%44%
2483
September1st to 15thDay
14%6%26%43345%6%40%
2123
16th to endDay
20%5%25%424446%38%
1790
October1st to 15thDay
19%13%5%8%5%3434426%
1650
16th to endDay
19%17%5%6%6%3444423%
1643
November1st to 15thDay
17%14%7%9%7%2433424%
1407
16th to endDay
16%15%6%12%9%44445%16%
1440
December1st to 15thDay
12%14%5%12%10%37%7%6%6%12%
1272
16th to endDay
14%16%10%13%9%3445%412%
1344
January1st to 15thNight
9%12%6%10%8%5%7%8%7%5%18%
2685
16th to endNight
10%12%6%10%8%46%8%9%7%15%
2782
February1st to 15thNight
6%10%48%6%46%6%6%8%30%
2285
16th to endNight
10%9%6%9%7%36%5%6%6%27%
2051
March1st to 15thNight
10%12%6%7%5%34447%32%
2034
16th to endNight
16%8%46%433345%37%
2112
April1st to 15thNight
12%7%35%434447%41%
1736
16th to endNight
14%8%36%5%24445%39%
1620
May1st to 15thNight
19%9%44425%445%36%
1449
16th to endNight
17%42342445%7%41%
1368
June1st to 15thNight
19%7%2432335%6%40%
1260
16th to endNight
14%6%25%5%35%46%7%37%
1260
July1st to 15thNight
7%414325%46%8%50%
1260
16th to endNight
8%21342346%8%54%
1335
August1st to 15thNight
9%31332445%8%51%
1563
16th to endNight
10%31432235%7%53%
1719
September1st to 15thNight
13%414323447%48%
1755
16th to endNight
17%7%245%2335%7%38%
1829
October1st to 15thNight
16%10%26%7%35%446%31%
1980
16th to endNight
18%13%36%6%44445%27%
2227
November1st to 15thNight
16%15%5%8%5%34445%25%
2451
16th to endNight
15%15%6%11%8%35%345%19%
2520
December1st to 15thNight
9%13%6%12%12%5%6%5%6%5%15%
2688
16th to endNight
15%16%7%11%10%45%5%5%5%12%
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
5%9%5%8%8%35%6%6%5%35%
1254
16th to endDay
8%11%5%11%7%45%5%6%6%26%
1441
February1st to 15thDay
7%8%47%6%45%6%46%38%
1575
16th to endDay
6%10%48%6%35%5%46%39%
1422
March1st to 15thDay
10%9%36%5%24345%43%
1923
16th to endDay
9%10%35%6%2444444%
2110
April1st to 15thDay
9%7%25%6%3344448%
2211
16th to endDay
13%8%36%423345%44%
2340
May1st to 15thDay
14%8%25%433335%44%
2502
16th to endDay
15%6%24423345%48%
2743
June1st to 15thDay
14%5%23424446%44%
2700
16th to endDay
12%5%26%5%345%5%6%43%
2700
July1st to 15thDay
10%31443445%6%53%
2700
16th to endDay
8%41433345%6%53%
2833
August1st to 15thDay
10%4245%3445%9%45%
2394
16th to endDay
12%5%13423346%50%
2483
September1st to 15thDay
12%6%25%323446%45%
2123
16th to endDay
16%5%25%423346%45%
1790
October1st to 15thDay
18%13%37%5%2334433%
1650
16th to endDay
17%14%36%7%3434430%
1643
November1st to 15thDay
13%12%39%5%3332338%
1407
16th to endDay
13%14%412%10%3322328%
1440
December1st to 15thDay
7%11%5%9%10%46%6%46%27%
1272
16th to endDay
12%12%7%11%7%4434327%
1344
January1st to 15thNight
5%10%48%6%46%5%7%5%33%
2685
16th to endNight
7%11%48%6%25%6%7%8%29%
2782
February1st to 15thNight
6%8%37%5%45%46%6%40%
2278
16th to endNight
7%8%38%6%345%45%41%
2051
March1st to 15thNight
7%9%47%433445%45%
2046
16th to endNight
12%8%35%42333448%
2110
April1st to 15thNight
9%7%23423446%50%
1736
16th to endNight
13%7%25%5%2334446%
1620
May1st to 15thNight
13%8%2442335%5%47%
1448
16th to endNight
13%5%13422445%52%
1369
June1st to 15thNight
16%6%13323345%50%
1260
16th to endNight
12%42442345%6%48%
1260
July1st to 15thNight
5%21421445%7%61%
1260
16th to endNight
7%23322337%62%
1335
August1st to 15thNight
9%31232445%6%56%
1563
16th to endNight
9%323323346%58%
1719
September1st to 15thNight
12%5%14323345%51%
1755
16th to endNight
15%5%24322346%48%
1829
October1st to 15thNight
17%10%245%33445%37%
1980
16th to endNight
15%12%27%6%3444434%
2227
November1st to 15thNight
14%12%37%5%2334437%
2451
16th to endNight
12%14%410%8%3433331%
2520
December1st to 15thNight
6%12%411%10%5%5%445%31%
2688
16th to endNight
10%14%5%10%8%35%44427%
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
10%11%6%11%7%47%7%6%7%20%
1253
16th to endDay
12%12%8%13%8%6%7%6%6%6%12%
1441
February1st to 15thDay
8%8%5%8%7%5%7%7%8%7%26%
1575
16th to endDay
8%13%6%9%8%47%6%47%24%
1422
March1st to 15thDay
12%12%6%8%6%345%46%28%
1923
16th to endDay
14%11%38%6%35%436%31%
2112
April1st to 15thDay
12%9%27%6%35%447%37%
2211
16th to endDay
15%9%46%5%3445%5%33%
2340
May1st to 15thDay
18%10%46%6%24445%31%
2502
16th to endDay
19%7%35%424446%36%
2743
June1st to 15thDay
17%5%26%6%35%7%6%7%32%
2700
16th to endDay
15%6%36%7%35%6%6%8%30%
2700
July1st to 15thDay
11%4145%35%5%6%9%41%
2700
16th to endDay
9%5%245%35%6%6%8%43%
2833
August1st to 15thDay
11%5%25%6%35%6%6%8%38%
2394
16th to endDay
13%5%2443445%7%44%
2483
September1st to 15thDay
13%7%26%43445%7%40%
2123
16th to endDay
19%6%245%24347%37%
1790
October1st to 15thDay
19%14%49%5%2435%5%25%
1650
16th to endDay
19%16%47%8%44445%22%
1643
November1st to 15thDay
17%13%7%9%7%3433325%
1407
16th to endDay
15%15%6%13%10%45%44415%
1440
December1st to 15thDay
12%14%6%11%9%5%7%7%6%5%12%
1272
16th to endDay
14%16%9%12%10%445%5%412%
1344
January1st to 15thNight
9%12%7%11%7%47%7%7%6%18%
2685
16th to endNight
10%13%6%9%9%37%6%9%8%15%
2782
February1st to 15thNight
7%10%49%6%5%6%5%5%9%30%
2278
16th to endNight
10%10%6%9%7%35%6%6%7%26%
2051
March1st to 15thNight
10%11%5%8%5%44446%32%
2046
16th to endNight
15%8%47%423445%37%
2112
April1st to 15thNight
11%7%345%2445%7%41%
1736
16th to endNight
14%8%36%5%3445%6%38%
1620
May1st to 15thNight
18%8%45%43445%5%35%
1448
16th to endNight
16%5%243345%5%8%41%
1368
June1st to 15thNight
18%7%24324446%40%
1260
16th to endNight
14%5%25%5%35%46%8%38%
1260
July1st to 15thNight
7%313335%5%5%9%51%
1260
16th to endNight
8%21421446%8%54%
1335
August1st to 15thNight
9%31333346%8%51%
1563
16th to endNight
9%315%32335%7%53%
1719
September1st to 15thNight
12%6%15%32345%6%48%
1755
16th to endNight
19%6%35%323447%39%
1829
October1st to 15thNight
16%10%36%7%3445%6%31%
1980
16th to endNight
17%13%38%7%34445%26%
2227
November1st to 15thNight
16%15%5%7%6%35%45%5%24%
2451
16th to endNight
16%15%5%10%9%5%5%43418%
2520
December1st to 15thNight
9%12%7%12%11%6%7%5%5%6%15%
2688
16th to endNight
14%17%6%11%9%46%45%5%12%
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
10%11%6%11%7%47%6%6%7%19%
1253
16th to endDay
12%11%8%13%8%5%7%6%7%5%12%
1441
February1st to 15thDay
8%8%5%9%7%5%7%7%8%7%26%
1575
16th to endDay
8%12%7%9%8%37%6%47%24%
1422
March1st to 15thDay
12%12%6%8%6%345%46%28%
1923
16th to endDay
14%11%37%5%45%446%32%
2110
April1st to 15thDay
12%9%27%6%34446%38%
2211
16th to endDay
15%9%46%6%3445%6%33%
2340
May1st to 15thDay
19%10%46%6%34445%31%
2502
16th to endDay
19%7%35%5%25%446%36%
2743
June1st to 15thDay
17%5%26%5%36%6%6%7%32%
2700
16th to endDay
15%6%36%7%36%5%6%8%30%
2700
July1st to 15thDay
11%4245%35%46%8%41%
2700
16th to endDay
9%5%24435%5%7%8%43%
2833
August1st to 15thDay
11%5%35%6%446%6%8%38%
2394
16th to endDay
13%5%1443445%8%44%
2483
September1st to 15thDay
13%7%26%5%34447%40%
2123
16th to endDay
19%6%345%24447%38%
1790
October1st to 15thDay
19%14%49%5%3445%5%25%
1650
16th to endDay
19%16%47%8%44445%22%
1643
November1st to 15thDay
18%13%7%9%7%3433325%
1407
16th to endDay
16%15%6%13%10%4444415%
1440
December1st to 15thDay
12%13%6%10%9%48%7%6%5%13%
1272
16th to endDay
14%16%9%12%10%4445%412%
1344
January1st to 15thNight
9%12%7%11%7%47%7%8%6%18%
2685
16th to endNight
10%13%6%9%9%37%7%9%8%15%
2782
February1st to 15thNight
6%10%48%6%5%6%6%5%9%30%
2278
16th to endNight
10%10%5%9%6%35%6%6%7%27%
2051
March1st to 15thNight
10%11%5%8%5%44446%32%
2046
16th to endNight
15%8%47%5%23445%38%
2112
April1st to 15thNight
11%7%345%3445%7%41%
1736
16th to endNight
14%8%36%5%3345%6%38%
1620
May1st to 15thNight
18%8%36%43445%5%35%
1448
16th to endNight
16%5%244345%5%7%41%
1368
June1st to 15thNight
18%7%2442345%6%40%
1260
16th to endNight
14%5%25%436%46%8%38%
1260
July1st to 15thNight
7%314425%45%9%51%
1260
16th to endNight
8%21431436%8%55%
1335
August1st to 15thNight
9%31333446%8%51%
1563
16th to endNight
9%31442335%7%53%
1719
September1st to 15thNight
12%5%25%323347%48%
1755
16th to endNight
19%6%35%323447%39%
1829
October1st to 15thNight
16%11%35%7%35%35%6%31%
1980
16th to endNight
17%13%37%7%35%45%5%26%
2227
November1st to 15thNight
16%15%5%7%6%35%445%24%
2451
16th to endNight
16%14%5%10%10%45%44418%
2520
December1st to 15thNight
9%12%7%12%11%6%7%5%5%6%15%
2688
16th to endNight
14%17%7%11%9%46%5%5%6%12%
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%12%16%2
1254
16th to endDay
69%5%7%12%3
1441
February1st to 15thDay
52%6%14%17%9%
1576
16th to endDay
58%5%10%17%7%
1422
March1st to 15thDay
54%6%14%16%7%
1923
16th to endDay
53%6%13%17%7%1
2112
April1st to 15thDay
45%5%12%23%12%1
2211
16th to endDay
48%5%10%21%11%1
2340
May1st to 15thDay
53%5%10%22%7%
2502
16th to endDay
48%5%12%19%12%1
2747
June1st to 15thDay
48%8%13%19%9%
2700
16th to endDay
49%9%16%18%6%
2700
July1st to 15thDay
36%8%16%29%8%
2541
16th to endDay
37%7%18%25%9%
2655
August1st to 15thDay
41%9%17%25%6%
2379
16th to endDay
38%7%16%27%8%
2483
September1st to 15thDay
42%7%18%25%5%
2123
16th to endDay
47%6%15%25%3
1790
October1st to 15thDay
61%6%11%16%3
1650
16th to endDay
65%6%13%13%1
1643
November1st to 15thDay
64%5%12%11%31
1407
16th to endDay
73%6%8%8%3
1440
December1st to 15thDay
71%7%10%9%1
1272
16th to endDay
73%5%6%11%3
1344
January1st to 15thNight
61%7%11%16%3
2685
16th to endNight
62%6%11%16%3
2782
February1st to 15thNight
49%6%16%20%6%
2288
16th to endNight
54%6%13%20%4
2051
March1st to 15thNight
50%7%12%16%11%
2046
16th to endNight
48%413%20%10%2
2112
April1st to 15thNight
41%411%22%16%2
1736
16th to endNight
46%39%20%15%2
1620
May1st to 15thNight
49%411%24%9%
1449
16th to endNight
42%6%11%22%13%2
1369
June1st to 15thNight
42%6%14%24%11%1
1260
16th to endNight
42%9%17%21%8%1
1260
July1st to 15thNight
29%7%16%33%10%2
1190
16th to endNight
27%7%16%33%14%1
1250
August1st to 15thNight
30%7%16%34%10%
1554
16th to endNight
29%7%17%33%10%
1719
September1st to 15thNight
37%5%16%29%10%
1755
16th to endNight
45%5%15%27%6%
1829
October1st to 15thNight
53%7%14%18%5%
1980
16th to endNight
60%6%13%17%1
2227
November1st to 15thNight
63%5%13%13%3
2451
16th to endNight
70%5%10%9%3
2520
December1st to 15thNight
70%5%11%9%1
2688
16th to endNight
72%48%10%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
5%10%33%32%16%2
90
16th to endDay
25%6%32%26%9%1
96
February1st to 15thDay
15%12%47%21%3
90
16th to endDay
23%12%38%17%6%2
81
March1st to 15thDay
17%8%28%36%5%2
90
16th to endDay
19%10%28%27%13%1
96
April1st to 15thDay
15%20%31%21%10%1
330
16th to endDay
20%20%27%22%7%1
450
May1st to 15thDay
20%23%29%18%43
468
16th to endDay
19%22%21%22%10%3
517
June1st to 15thDay
17%20%31%19%8%2
495
16th to endDay
17%17%25%23%10%4
495
July1st to 15thDay
15%14%24%24%15%5%
475
16th to endDay
11%18%25%22%17%4
515
August1st to 15thDay
12%13%21%28%17%6%
493
16th to endDay
14%13%23%32%13%3
523
September1st to 15thDay
14%10%32%26%12%2
310
16th to endDay
28%12%40%16%2
90
October1st to 15thDay
28%7%25%28%8%
90
16th to endDay
32%5%38%19%22
96
November1st to 15thDay
22%11%32%26%7%
90
16th to endDay
40%8%31%11%7%1
90
December1st to 15thDay
10%433%36%14%1
90
16th to endDay
16%10%38%23%5%5%
96
January1st to 15thNight
11%24%27%25%8%2
900
16th to endNight
14%23%31%25%4
960
February1st to 15thNight
11%21%27%27%10%1
880
16th to endNight
12%21%25%23%12%3
789
March1st to 15thNight
11%25%28%22%11%
606
16th to endNight
17%22%23%19%11%4
576
April1st to 15thNight
13%22%28%26%8%
539
16th to endNight
17%21%22%27%10%
540
May1st to 15thNight
17%22%25%25%6%1
540
16th to endNight
18%22%18%27%11%1
563
June1st to 15thNight
21%20%20%27%11%
540
16th to endNight
15%21%18%27%14%2
540
July1st to 15thNight
8%14%21%35%18%1
510
16th to endNight
10%18%20%28%18%2
564
August1st to 15thNight
10%13%16%34%22%3
539
16th to endNight
11%14%22%29%20%2
573
September1st to 15thNight
16%13%24%28%14%2
530
16th to endNight
20%15%27%24%11%1
506
October1st to 15thNight
22%17%29%24%5%
660
16th to endNight
22%17%28%22%8%1
781
November1st to 15thNight
20%23%28%17%8%1
875
16th to endNight
20%26%27%19%5%1
900
December1st to 15thNight
12%23%29%25%8%
900
16th to endNight
17%22%30%19%8%1
960
Page generated at 2017-09-13 06:39:16. Version ac04

Copyright 2017 A. Danko


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