Lambton Shores
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lambton Shores clear sky chart from 2005-11-06 to 2024-02-05.

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
34%
23583
7%
80410
6%
23482
37%
23482
8%
66709

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 10thNight
12%
944
2%
4473
0%
926
15%
926
2%
3944
January11th to 20thNight
15%
848
1%
4277
1%
832
16%
832
2%
3899
January21st to endNight
17%
833
2%
4529
2%
814
20%
814
2%
4053
February1st to 10thNight
16%
739
5%
2399
2%
739
19%
739
5%
2110
February11th to 20thNight
23%
700
5%
2243
2%
700
26%
700
5%
1977
February21st to endNight
17%
592
6%
1776
2%
592
22%
592
7%
1535
March1st to 10thNight
26%
720
9%
2061
5%
720
29%
720
9%
1732
March11th to 20thNight
27%
720
12%
1980
6%
720
32%
720
12%
1602
March21st to endNight
32%
792
10%
2178
7%
792
34%
792
11%
1819
April1st to 10thNight
32%
709
9%
1927
4%
709
36%
709
13%
1537
April11th to 20thNight
38%
533
14%
1597
8%
533
42%
533
14%
1242
April21st to endNight
36%
540
11%
1620
5%
540
41%
540
11%
1297
May1st to 10thNight
43%
540
9%
1620
7%
540
45%
540
13%
1280
May11th to 20thNight
46%
531
13%
1592
11%
531
49%
531
14%
1216
May21st to endNight
57%
425
12%
1588
14%
425
61%
425
15%
1115
June1st to 10thNight
52%
360
10%
1360
10%
360
57%
360
12%
1008
June11th to 20thNight
58%
360
15%
1260
17%
360
62%
360
16%
898
June21st to endNight
57%
360
12%
1260
12%
360
60%
360
14%
918
July1st to 10thNight
69%
378
11%
1253
14%
378
71%
378
18%
890
July11th to 20thNight
63%
522
12%
1435
11%
522
65%
522
17%
1089
July21st to endNight
67%
591
10%
1672
9%
558
68%
558
17%
1232
August1st to 10thNight
67%
537
9%
1600
8%
534
67%
534
14%
1225
August11th to 20thNight
65%
534
16%
1598
12%
534
66%
534
19%
1138
August21st to endNight
61%
594
15%
1782
10%
594
64%
594
18%
1296
September1st to 10thNight
56%
702
10%
1867
6%
702
59%
702
16%
1450
September11th to 20thNight
59%
720
17%
1980
12%
720
62%
720
18%
1492
September21st to endNight
48%
720
10%
1980
8%
720
49%
720
13%
1587
October1st to 10thNight
42%
720
11%
2096
10%
720
44%
720
13%
1637
October11th to 20thNight
30%
720
7%
2160
4%
720
34%
720
8%
1798
October21st to endNight
22%
792
6%
2448
3%
792
26%
792
6%
2115
November1st to 10thNight
32%
740
12%
2406
10%
740
36%
740
11%
1879
November11th to 20thNight
19%
760
8%
2582
5%
760
24%
760
6%
2203
November21st to endNight
22%
760
6%
2660
5%
760
23%
760
5%
2334
December1st to 10thNight
13%
760
1%
2660
0%
760
13%
760
3%
2478
December11th to 20thNight
13%
759
2%
3278
1%
759
15%
759
3%
2880
December21st to endNight
13%
1028
1%
5213
0%
1016
14%
1016
1%
4804

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%11%5%8%6%35%5%5%7%31%
78245
Night
16%13%5%8%7%35%45%6%28%
80625
TransparencyDay
35%37%9%12%6%1
77952
Night
39%36%8%10%5%1
80438
SeeingDay
17%10%26%26%15%5%
14081
Night
20%9%28%29%12%1
23609

By Month

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 10thDay
18%21%9%13%8%3443414%
2466
11th to 20thDay
13%19%10%19%11%44345%8%
2684
21st to endDay
23%21%8%11%8%4443310%
3124
February1st to 10thDay
16%17%5%12%10%45%5%5%417%
1656
11th to 20thDay
15%11%8%15%9%6%6%44419%
1600
21st to endDay
16%15%6%11%7%36%5%45%23%
1480
March1st to 10thDay
15%12%6%9%8%45%5%5%5%27%
1898
11th to 20thDay
13%12%6%9%6%3445%7%30%
1980
21st to endDay
19%12%5%8%6%3445%5%29%
2178
April1st to 10thDay
15%14%47%5%35%46%8%30%
2047
11th to 20thDay
17%10%35%5%3446%7%36%
2312
21st to endDay
19%9%47%5%35%35%8%34%
2340
May1st to 10thDay
16%8%36%5%345%5%8%36%
2340
11th to 20thDay
17%8%45%43445%7%38%
2301
21st to endDay
11%6%25%5%35%5%6%8%43%
2686
June1st to 10thDay
11%5%25%5%35%5%6%8%43%
2595
11th to 20thDay
9%5%35%5%35%5%6%9%43%
2700
21st to endDay
12%5%26%435%5%5%9%44%
2700
July1st to 10thDay
8%4244345%6%10%50%
2666
11th to 20thDay
10%6%345%35%5%7%10%44%
2476
21st to endDay
8%6%25%5%36%5%7%9%43%
2547
August1st to 10thDay
9%5%25%5%45%6%8%11%41%
2327
11th to 20thDay
10%5%27%5%45%6%6%10%40%
2303
21st to endDay
11%6%35%5%345%6%8%43%
2572
September1st to 10thDay
10%7%37%5%36%47%7%41%
2072
11th to 20thDay
11%5%25%6%35%46%8%44%
1980
21st to endDay
16%7%26%5%35%47%8%36%
1980
October1st to 10thDay
15%6%37%6%445%6%7%35%
1863
11th to 20thDay
22%11%48%6%345%5%7%25%
1800
21st to endDay
26%14%47%6%44446%22%
1906
November1st to 10thDay
16%12%48%6%4446%7%28%
1672
11th to 20thDay
15%15%7%9%7%35%46%7%22%
1596
21st to endDay
19%19%8%10%8%45%5%45%15%
1520
December1st to 10thDay
16%21%8%13%9%445%4413%
1520
11th to 20thDay
18%19%10%12%7%35%5%45%13%
1910
21st to endDay
27%23%7%10%6%334448%
2448
January1st to 10thNight
17%19%10%14%8%45%33413%
4487
11th to 20thNight
14%19%10%15%10%45%445%10%
4277
21st to endNight
22%18%8%13%7%4444412%
4532
February1st to 10thNight
17%15%7%11%10%47%44417%
2399
11th to 20thNight
16%15%6%10%8%5%5%6%5%5%19%
2241
21st to endNight
17%11%7%10%9%45%5%45%22%
1776
March1st to 10thNight
15%11%5%9%8%46%45%5%28%
2061
11th to 20thNight
13%11%5%9%6%45%45%7%32%
1980
21st to endNight
19%11%48%7%34445%31%
2178
April1st to 10thNight
19%11%46%6%3446%6%32%
1927
11th to 20thNight
18%8%35%5%35%5%5%7%38%
1597
21st to endNight
17%11%46%6%345%47%34%
1620
May1st to 10thNight
17%8%36%6%35%46%8%34%
1620
11th to 20thNight
13%7%47%5%345%5%7%40%
1592
21st to endNight
11%4234346%6%8%49%
1587
June1st to 10thNight
12%6%345%35%46%8%44%
1360
11th to 20thNight
9%5%26%5%35%6%8%8%43%
1260
21st to endNight
10%5%25%7%345%6%8%47%
1260
July1st to 10thNight
6%42442345%9%56%
1289
11th to 20thNight
10%5%244345%6%10%47%
1483
21st to endNight
7%5%25%5%35%6%7%9%47%
1771
August1st to 10thNight
8%5%25%5%36%6%5%8%46%
1611
11th to 20thNight
9%5%245%45%5%6%7%47%
1598
21st to endNight
10%7%345%3445%7%50%
1782
September1st to 10thNight
11%5%35%6%445%6%7%45%
1867
11th to 20thNight
12%5%244345%46%51%
1980
21st to endNight
15%7%47%5%35%5%5%6%40%
1980
October1st to 10thNight
15%7%46%7%34446%40%
2096
11th to 20thNight
23%10%36%6%4445%6%30%
2160
21st to endNight
26%12%48%6%3445%5%22%
2448
November1st to 10thNight
16%14%36%5%3445%6%34%
2406
11th to 20thNight
17%15%6%9%7%35%5%6%6%21%
2582
21st to endNight
21%18%6%10%6%34445%19%
2660
December1st to 10thNight
18%20%11%12%7%35%43412%
2660
11th to 20thNight
15%20%8%12%8%44445%16%
3285
21st to endNight
25%23%8%10%7%3433310%
5213

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 10thDay
57%30%10%4
2467
11th to 20thDay
63%28%6%31
2684
21st to endDay
64%27%6%21
3124
February1st to 10thDay
46%37%8%7%2
1656
11th to 20thDay
46%39%6%6%3
1609
21st to endDay
44%39%6%7%4
1480
March1st to 10thDay
37%38%10%11%4
1898
11th to 20thDay
35%38%8%10%7%2
1980
21st to endDay
36%38%9%13%31
2178
April1st to 10thDay
31%38%9%14%7%1
2047
11th to 20thDay
30%38%11%12%9%1
2312
21st to endDay
31%38%10%12%7%1
2340
May1st to 10thDay
29%37%8%15%10%1
2340
11th to 20thDay
28%38%7%12%12%3
2305
21st to endDay
25%39%10%14%11%2
2686
June1st to 10thDay
25%39%10%17%8%1
2595
11th to 20thDay
20%39%10%19%12%1
2700
21st to endDay
26%39%10%16%9%
2700
July1st to 10thDay
21%40%9%18%10%1
2593
11th to 20thDay
22%40%10%17%9%1
2401
21st to endDay
22%41%11%15%10%1
2405
August1st to 10thDay
25%40%11%17%7%
2314
11th to 20thDay
21%38%13%16%10%1
2303
21st to endDay
24%38%9%19%9%1
2572
September1st to 10thDay
26%39%10%15%9%1
2072
11th to 20thDay
23%39%11%20%7%
1980
21st to endDay
31%39%9%14%6%1
1980
October1st to 10thDay
30%39%9%15%7%1
1863
11th to 20thDay
39%39%9%9%41
1800
21st to endDay
42%39%8%7%4
1906
November1st to 10thDay
31%42%8%13%5%1
1672
11th to 20thDay
36%43%9%8%5%1
1596
21st to endDay
43%42%6%7%1
1520
December1st to 10thDay
47%43%6%31
1520
11th to 20thDay
49%35%8%6%1
1906
21st to endDay
64%27%8%2
2448
January1st to 10thNight
56%30%8%6%1
4487
11th to 20thNight
58%31%8%21
4277
21st to endNight
61%26%8%5%1
4532
February1st to 10thNight
45%38%6%9%2
2399
11th to 20thNight
43%40%7%7%3
2243
21st to endNight
42%37%8%9%3
1776
March1st to 10thNight
37%38%8%12%4
2061
11th to 20thNight
32%38%9%13%7%1
1980
21st to endNight
36%38%7%14%5%1
2178
April1st to 10thNight
32%36%7%14%9%1
1927
11th to 20thNight
29%37%8%13%11%1
1597
21st to endNight
32%38%7%10%10%2
1620
May1st to 10thNight
31%38%7%13%9%2
1620
11th to 20thNight
27%38%7%13%10%4
1593
21st to endNight
21%38%11%15%13%3
1588
June1st to 10thNight
26%38%8%16%11%1
1360
11th to 20thNight
22%38%10%15%14%1
1260
21st to endNight
23%39%11%15%11%1
1260
July1st to 10thNight
19%38%8%17%15%2
1253
11th to 20thNight
22%40%8%19%10%1
1435
21st to endNight
19%42%12%16%10%1
1672
August1st to 10thNight
26%39%9%18%7%
1600
11th to 20thNight
19%38%11%20%10%3
1598
21st to endNight
21%39%9%20%11%1
1782
September1st to 10thNight
26%39%9%15%10%1
1867
11th to 20thNight
23%38%9%20%10%
1980
21st to endNight
31%38%9%13%9%
1980
October1st to 10thNight
29%39%8%14%10%1
2096
11th to 20thNight
37%38%8%11%5%1
2160
21st to endNight
41%39%7%8%5%
2448
November1st to 10thNight
26%43%8%16%6%
2406
11th to 20thNight
36%43%9%8%31
2582
21st to endNight
41%42%8%8%1
2660
December1st to 10thNight
49%41%6%31
2660
11th to 20thNight
49%36%9%6%1
3288
21st to endNight
63%27%7%2
5213

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 10thDay
21%21%31%20%6%1
254
11th to 20thDay
23%16%42%14%5%1
270
21st to endDay
27%15%32%23%21
297
February1st to 10thDay
24%17%43%13%21
252
11th to 20thDay
22%19%41%18%
240
21st to endDay
20%28%36%15%2
198
March1st to 10thDay
23%15%37%19%5%1
338
11th to 20thDay
18%16%30%27%7%1
420
21st to endDay
26%12%31%23%8%1
462
April1st to 10thDay
18%11%34%27%9%1
420
11th to 20thDay
22%12%27%23%11%4
412
21st to endDay
24%9%30%24%11%2
420
May1st to 10thDay
22%9%26%26%13%3
423
11th to 20thDay
18%7%25%28%17%5%
447
21st to endDay
12%420%31%24%9%
485
June1st to 10thDay
11%427%35%17%6%
525
11th to 20thDay
12%5%25%35%19%5%
630
21st to endDay
14%5%22%37%18%4
630
July1st to 10thDay
8%5%19%31%27%10%
621
11th to 20thDay
12%422%32%23%8%
574
21st to endDay
9%215%38%28%8%
488
August1st to 10thDay
11%313%33%27%14%
446
11th to 20thDay
12%316%30%25%15%
439
21st to endDay
13%417%28%29%9%
495
September1st to 10thDay
13%422%28%22%11%
450
11th to 20thDay
9%419%25%29%13%
450
21st to endDay
15%9%25%23%19%9%
450
October1st to 10thDay
16%10%25%23%18%7%
450
11th to 20thDay
24%12%32%24%8%
450
21st to endDay
30%14%30%21%41
421
November1st to 10thDay
20%17%31%20%10%2
270
11th to 20thDay
25%19%29%19%6%2
216
21st to endDay
25%19%37%17%2
180
December1st to 10thDay
23%24%29%19%41
180
11th to 20thDay
27%22%31%18%3
180
21st to endDay
28%18%38%14%2
198
January1st to 10thNight
25%15%39%16%6%1
950
11th to 20thNight
28%14%32%22%4
852
21st to endNight
22%11%36%25%6%
836
February1st to 10thNight
24%11%40%22%2
739
11th to 20thNight
23%14%30%28%6%
703
21st to endNight
23%13%41%19%4
592
March1st to 10thNight
20%10%34%29%7%
720
11th to 20thNight
18%10%38%26%7%1
720
21st to endNight
22%8%30%29%10%1
792
April1st to 10thNight
22%13%28%31%6%
709
11th to 20thNight
20%9%29%28%12%1
533
21st to endNight
21%7%29%33%9%1
540
May1st to 10thNight
19%5%26%36%13%2
540
11th to 20thNight
16%326%40%14%2
531
21st to endNight
13%420%40%21%2
427
June1st to 10thNight
14%423%41%18%1
360
11th to 20thNight
9%323%45%18%1
360
21st to endNight
10%5%19%42%23%1
360
July1st to 10thNight
7%115%43%30%3
378
11th to 20thNight
11%216%39%29%4
522
21st to endNight
8%216%47%26%2
591
August1st to 10thNight
9%212%39%34%4
537
11th to 20thNight
10%213%36%34%4
534
21st to endNight
11%317%36%30%3
594
September1st to 10thNight
12%5%18%35%24%6%
702
11th to 20thNight
12%5%18%34%26%5%
720
21st to endNight
17%6%21%32%19%5%
720
October1st to 10thNight
17%7%26%29%18%2
720
11th to 20thNight
27%11%26%26%9%1
720
21st to endNight
30%13%31%22%4
792
November1st to 10thNight
24%11%29%25%10%1
740
11th to 20thNight
24%16%35%18%7%1
760
21st to endNight
29%13%31%22%5%
760
December1st to 10thNight
28%18%33%17%4
760
11th to 20thNight
25%17%36%19%3
760
21st to endNight
31%14%33%20%2
1035
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