Little Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Little Falls clear sky chart from 2005-11-05 to 2017-10-31.

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%
16332
15%
47209
8%
16285
43%
16285
24%
31975

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
28%
900
11%
2661
6%
895
34%
895
17%
1927
January16th to endNight
23%
960
12%
2535
4%
960
29%
960
17%
1938
February1st to 15thNight
31%
879
13%
2287
4%
875
37%
875
23%
1611
February16th to endNight
31%
789
14%
2051
4%
789
37%
789
22%
1475
March1st to 15thNight
35%
554
13%
1994
10%
554
40%
554
18%
1351
March16th to endNight
32%
576
15%
2112
12%
576
40%
576
16%
1458
April1st to 15thNight
32%
539
16%
1800
12%
539
42%
539
22%
1190
April16th to endNight
31%
540
15%
1620
10%
540
39%
540
18%
1164
May1st to 15thNight
32%
540
13%
1509
6%
540
38%
540
22%
1061
May16th to endNight
43%
563
13%
1498
6%
561
47%
561
28%
995
June1st to 15thNight
47%
540
11%
1326
4%
540
50%
540
35%
854
June16th to endNight
55%
540
14%
1260
5%
540
57%
540
41%
809
July1st to 15thNight
58%
510
16%
1190
6%
510
60%
510
47%
717
July16th to endNight
63%
564
19%
1430
10%
531
64%
531
45%
803
August1st to 15thNight
64%
539
20%
1610
16%
536
67%
536
38%
911
August16th to endNight
56%
573
23%
1752
20%
573
64%
573
38%
980
September1st to 15thNight
56%
540
21%
1800
19%
540
63%
540
35%
968
September16th to endNight
42%
557
21%
1996
15%
557
52%
557
28%
1132
October1st to 15thNight
38%
720
22%
2160
14%
720
44%
720
28%
1339
October16th to endNight
32%
774
16%
2310
8%
774
38%
774
21%
1604
November1st to 15thNight
33%
875
18%
2448
9%
875
40%
875
23%
1666
November16th to endNight
29%
900
15%
2520
9%
900
34%
900
20%
1796
December1st to 15thNight
26%
900
9%
2520
4%
900
30%
900
15%
1931
December16th to endNight
21%
960
10%
2820
3%
960
27%
960
11%
2295

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%8%36%5%3445%7%36%
48543
Night
12%8%36%5%2445%6%39%
47370
Cloud CoverDay
13%8%36%5%3445%7%36%
48554
Night
12%8%36%5%2445%6%39%
47374
Cloud CoverDay
13%8%36%5%35%45%7%36%
48552
Night
12%8%36%5%2445%7%39%
47374
TransparencyDay
46%7%14%22%9%
48221
Night
44%6%14%23%10%1
47210
SeeingDay
16%7%29%27%15%3
6303
Night
16%7%31%31%11%1
16333

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
8%12%6%10%8%45%45%7%26%
1274
16th to endDay
9%13%5%11%7%36%5%6%7%23%
1686
February1st to 15thDay
6%11%5%10%7%35%5%46%32%
1575
16th to endDay
10%10%48%9%46%6%46%27%
1422
March1st to 15thDay
13%9%46%6%3445%6%33%
1965
16th to endDay
17%11%46%5%2345%7%30%
2112
April1st to 15thDay
15%9%46%424446%37%
2145
16th to endDay
22%11%44433445%30%
2340
May1st to 15thDay
20%8%47%6%34345%30%
2439
16th to endDay
16%5%25%5%345%6%7%36%
2617
June1st to 15thDay
16%6%35%5%345%5%8%36%
2631
16th to endDay
10%4245%35%5%7%9%40%
2700
July1st to 15thDay
7%3135%35%5%5%8%48%
2700
16th to endDay
6%314436%5%6%9%47%
2636
August1st to 15thDay
8%425%5%46%6%5%8%40%
2340
16th to endDay
12%6%1442345%8%46%
2450
September1st to 15thDay
10%42442445%8%48%
2160
16th to endDay
15%7%23333347%43%
1950
October1st to 15thDay
16%9%24433347%41%
1800
16th to endDay
20%9%35%5%23345%35%
1910
November1st to 15thDay
12%10%37%5%2335%440%
1410
16th to endDay
15%12%48%6%3445%6%28%
1440
December1st to 15thDay
13%13%6%10%7%345%5%5%24%
1440
16th to endDay
16%14%8%11%8%33325%21%
1401
January1st to 15thNight
9%9%6%8%7%37%45%6%30%
2661
16th to endNight
10%13%6%10%5%35%5%6%7%26%
2535
February1st to 15thNight
7%11%48%6%25%45%7%36%
2285
16th to endNight
8%11%48%7%35%447%34%
2051
March1st to 15thNight
12%10%46%5%34446%38%
1982
16th to endNight
15%9%48%43435%6%34%
2112
April1st to 15thNight
16%10%44324345%41%
1800
16th to endNight
22%8%35%423445%34%
1620
May1st to 15thNight
19%8%34423346%38%
1509
16th to endNight
11%425%5%345%6%7%44%
1496
June1st to 15thNight
13%32342446%8%46%
1326
16th to endNight
7%32432446%9%51%
1260
July1st to 15thNight
5%3133135%6%8%55%
1260
16th to endNight
5%31331435%8%59%
1527
August1st to 15thNight
7%41342336%7%55%
1620
16th to endNight
9%31232335%8%56%
1752
September1st to 15thNight
8%41432335%6%56%
1800
16th to endNight
12%5%2432335%5%51%
1996
October1st to 15thNight
13%6%23423346%48%
2160
16th to endNight
18%10%24424346%37%
2310
November1st to 15thNight
11%8%35%5%25%5%5%6%39%
2448
16th to endNight
13%9%46%6%2445%6%35%
2520
December1st to 15thNight
13%13%6%9%6%3435%6%28%
2520
16th to endNight
15%17%7%9%7%34346%20%
2820

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
8%12%6%10%8%45%5%5%8%25%
1274
16th to endDay
9%13%5%10%7%46%5%6%8%23%
1686
February1st to 15thDay
6%10%6%10%6%35%45%6%32%
1575
16th to endDay
10%11%49%9%46%6%46%27%
1422
March1st to 15thDay
13%9%5%6%6%25%447%32%
1976
16th to endDay
16%12%47%43436%7%29%
2112
April1st to 15thDay
15%8%36%5%24446%36%
2145
16th to endDay
22%11%35%433445%30%
2340
May1st to 15thDay
19%9%38%6%34346%30%
2439
16th to endDay
15%5%35%5%345%6%8%35%
2617
June1st to 15thDay
16%7%35%435%45%8%35%
2631
16th to endDay
10%5%25%5%26%5%7%9%40%
2700
July1st to 15thDay
7%3145%35%5%5%8%48%
2700
16th to endDay
5%324435%5%6%9%47%
2636
August1st to 15thDay
8%425%5%46%7%6%8%40%
2340
16th to endDay
12%5%2442345%8%46%
2450
September1st to 15thDay
10%42442445%8%48%
2160
16th to endDay
15%6%33424447%43%
1950
October1st to 15thDay
16%9%25%433247%41%
1800
16th to endDay
20%9%345%33345%35%
1910
November1st to 15thDay
12%10%36%5%23345%39%
1410
16th to endDay
15%11%47%7%4445%6%28%
1440
December1st to 15thDay
13%13%6%10%7%35%5%45%24%
1440
16th to endDay
15%14%7%12%8%34335%21%
1401
January1st to 15thNight
9%9%6%9%7%36%45%6%30%
2661
16th to endNight
10%13%5%10%6%25%5%6%7%25%
2535
February1st to 15thNight
7%11%48%6%2445%7%36%
2278
16th to endNight
8%10%47%7%45%447%34%
2051
March1st to 15thNight
12%9%45%5%34446%38%
1994
16th to endNight
15%9%47%5%33446%34%
2112
April1st to 15thNight
16%9%44324336%41%
1800
16th to endNight
21%9%36%424435%34%
1620
May1st to 15thNight
18%9%24423446%38%
1508
16th to endNight
12%325%5%25%5%6%7%43%
1496
June1st to 15thNight
13%31342446%8%46%
1326
16th to endNight
7%3143245%5%10%50%
1260
July1st to 15thNight
5%3133145%6%9%55%
1260
16th to endNight
5%32332335%7%59%
1527
August1st to 15thNight
8%31332346%7%54%
1620
16th to endNight
8%31332435%8%55%
1752
September1st to 15thNight
7%41431435%7%55%
1800
16th to endNight
12%6%2441335%5%51%
1996
October1st to 15thNight
13%6%25%423345%47%
2160
16th to endNight
18%10%24414346%37%
2310
November1st to 15thNight
12%8%445%345%5%6%39%
2448
16th to endNight
13%9%47%5%3445%6%35%
2520
December1st to 15thNight
13%13%6%8%7%3445%6%27%
2520
16th to endNight
14%17%6%9%7%34345%20%
2820

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%6%10%7%45%5%5%8%25%
1274
16th to endDay
9%13%5%10%7%46%5%5%8%22%
1686
February1st to 15thDay
6%10%7%10%7%36%45%6%32%
1575
16th to endDay
10%10%49%9%46%5%5%6%26%
1422
March1st to 15thDay
13%10%47%6%26%5%47%32%
1976
16th to endDay
16%12%47%5%2435%7%30%
2110
April1st to 15thDay
15%9%36%5%24446%36%
2145
16th to endDay
22%10%36%423445%30%
2340
May1st to 15thDay
19%8%48%6%34446%30%
2439
16th to endDay
16%5%26%5%345%7%8%35%
2617
June1st to 15thDay
16%6%25%5%35%45%8%35%
2631
16th to endDay
10%425%5%35%5%6%8%40%
2700
July1st to 15thDay
7%3245%35%5%5%8%48%
2700
16th to endDay
6%3145%35%5%6%9%47%
2636
August1st to 15thDay
8%4246%46%6%6%8%41%
2340
16th to endDay
13%5%1441445%8%46%
2450
September1st to 15thDay
10%425%43345%8%47%
2160
16th to endDay
14%6%24424447%43%
1950
October1st to 15thDay
16%9%25%423347%40%
1800
16th to endDay
20%9%35%5%23346%35%
1910
November1st to 15thDay
12%11%46%42435%5%39%
1410
16th to endDay
14%11%47%7%35%5%5%6%27%
1440
December1st to 15thDay
13%13%6%9%8%35%45%5%23%
1440
16th to endDay
16%14%7%13%7%24335%20%
1401
January1st to 15thNight
9%9%6%9%7%36%45%6%30%
2661
16th to endNight
10%13%6%10%6%35%46%8%25%
2535
February1st to 15thNight
6%11%5%8%6%2445%7%36%
2278
16th to endNight
8%11%47%8%45%448%33%
2051
March1st to 15thNight
12%10%46%5%25%446%38%
1994
16th to endNight
15%9%48%5%3345%6%34%
2112
April1st to 15thNight
16%9%44324336%41%
1800
16th to endNight
21%10%36%424435%33%
1620
May1st to 15thNight
18%8%25%423446%38%
1508
16th to endNight
12%425%5%245%6%7%42%
1496
June1st to 15thNight
13%4134245%5%8%46%
1326
16th to endNight
8%3134245%6%10%49%
1260
July1st to 15thNight
5%3133245%6%8%56%
1260
16th to endNight
5%31331435%7%59%
1527
August1st to 15thNight
7%31342345%8%54%
1620
16th to endNight
8%31332335%8%55%
1752
September1st to 15thNight
7%424314347%55%
1800
16th to endNight
12%5%2332335%6%51%
1996
October1st to 15thNight
13%6%25%423445%47%
2160
16th to endNight
18%10%25%423346%37%
2310
November1st to 15thNight
12%8%45%5%35%5%46%38%
2448
16th to endNight
13%9%47%6%34446%35%
2520
December1st to 15thNight
13%14%5%9%7%34447%27%
2520
16th to endNight
14%17%7%9%8%34445%20%
2820

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
56%5%12%18%7%
1275
16th to endDay
58%6%15%15%3
1686
February1st to 15thDay
51%6%14%20%6%1
1576
16th to endDay
55%7%12%18%5%
1422
March1st to 15thDay
50%7%14%18%7%
1976
16th to endDay
54%7%13%21%3
2112
April1st to 15thDay
47%6%12%19%12%1
2145
16th to endDay
56%5%12%14%10%1
2340
May1st to 15thDay
55%6%11%19%6%
2439
16th to endDay
44%9%13%22%9%
2621
June1st to 15thDay
45%8%15%23%7%
2631
16th to endDay
37%9%17%24%9%1
2700
July1st to 15thDay
32%8%14%26%15%1
2541
16th to endDay
30%9%18%26%13%1
2470
August1st to 15thDay
37%9%14%26%9%2
2326
16th to endDay
35%7%15%25%15%1
2450
September1st to 15thDay
32%6%18%31%10%
2160
16th to endDay
40%6%14%32%5%
1950
October1st to 15thDay
43%5%14%25%11%
1800
16th to endDay
50%5%13%21%8%
1910
November1st to 15thDay
45%6%14%20%12%
1410
16th to endDay
55%6%13%15%7%1
1440
December1st to 15thDay
61%7%13%13%4
1440
16th to endDay
66%5%10%11%5%
1401
January1st to 15thNight
52%5%12%20%8%
2661
16th to endNight
55%6%14%16%6%
2535
February1st to 15thNight
46%6%15%22%9%
2288
16th to endNight
49%414%20%10%
2051
March1st to 15thNight
47%7%16%19%9%
1994
16th to endNight
51%5%14%21%6%
2112
April1st to 15thNight
45%5%10%23%13%1
1800
16th to endNight
51%6%9%17%12%2
1620
May1st to 15thNight
46%6%12%21%11%
1509
16th to endNight
37%9%13%23%14%1
1498
June1st to 15thNight
34%6%18%27%11%1
1326
16th to endNight
28%8%17%27%15%3
1260
July1st to 15thNight
23%7%19%30%16%2
1190
16th to endNight
23%6%17%31%17%3
1430
August1st to 15thNight
27%7%14%32%13%4
1610
16th to endNight
26%7%14%29%18%2
1752
September1st to 15thNight
28%5%15%33%16%
1800
16th to endNight
34%5%14%31%13%
1996
October1st to 15thNight
37%411%29%14%1
2160
16th to endNight
47%5%13%21%10%
2310
November1st to 15thNight
43%6%12%23%11%1
2448
16th to endNight
48%6%16%18%7%1
2520
December1st to 15thNight
57%6%13%17%4
2520
16th to endNight
65%5%10%12%4
2820

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
21%11%33%23%10%1
90
16th to endDay
20%5%35%27%11%
96
February1st to 15thDay
12%20%45%20%2
90
16th to endDay
22%8%40%20%6%1
81
March1st to 15thDay
18%6%36%27%8%1
90
16th to endDay
26%12%23%22%14%
96
April1st to 15thDay
18%10%32%25%12%
264
16th to endDay
29%9%28%21%10%
450
May1st to 15thDay
23%13%29%24%7%1
468
16th to endDay
20%8%30%25%10%4
517
June1st to 15thDay
15%7%33%26%14%2
495
16th to endDay
12%7%33%27%14%5%
495
July1st to 15thDay
8%5%25%29%23%7%
475
16th to endDay
7%5%25%34%21%5%
515
August1st to 15thDay
11%221%33%28%2
493
16th to endDay
14%425%28%21%5%
490
September1st to 15thDay
8%5%26%35%19%4
315
16th to endDay
21%236%26%8%4
138
October1st to 15thDay
16%12%33%20%11%5%
135
16th to endDay
22%13%29%21%12%
144
November1st to 15thDay
7%8%32%36%12%2
90
16th to endDay
33%7%28%21%8%
90
December1st to 15thDay
24%5%33%30%6%
90
16th to endDay
29%11%34%19%41
96
January1st to 15thNight
13%10%36%27%9%1
900
16th to endNight
16%10%38%29%4
960
February1st to 15thNight
12%9%36%31%9%1
880
16th to endNight
13%10%36%28%9%1
789
March1st to 15thNight
15%9%33%31%9%
554
16th to endNight
18%10%31%28%9%1
576
April1st to 15thNight
21%7%35%28%7%
539
16th to endNight
25%6%30%28%8%1
540
May1st to 15thNight
22%9%32%27%6%1
540
16th to endNight
13%5%30%35%13%
563
June1st to 15thNight
15%428%40%11%
540
16th to endNight
9%5%27%42%16%
540
July1st to 15thNight
8%126%40%21%1
510
16th to endNight
7%321%45%20%1
564
August1st to 15thNight
8%219%44%22%3
539
16th to endNight
9%424%35%24%1
573
September1st to 15thNight
9%326%36%22%1
540
16th to endNight
13%7%33%27%15%2
557
October1st to 15thNight
18%8%32%29%11%1
720
16th to endNight
26%7%29%29%6%
774
November1st to 15thNight
16%9%34%29%9%
875
16th to endNight
19%12%33%25%9%
900
December1st to 15thNight
19%10%34%29%6%
900
16th to endNight
22%9%32%27%6%
960
Page generated at 2017-11-01 16:23:41. Version ac04

Copyright 2017 A. Danko


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