Invermere
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Invermere clear sky chart from 2005-11-06 to 2024-02-15.

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%
23344
8%
80930
5%
23270
36%
23270
15%
58802

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
19%
940
2%
4725
2%
926
21%
926
4%
4179
January11th to 20thNight
22%
796
14%
4415
4%
788
25%
788
6%
3115
January21st to endNight
18%
833
3%
4862
3%
814
23%
814
5%
4023
February1st to 10thNight
19%
760
5%
2660
3%
760
23%
760
8%
2140
February11th to 20thNight
21%
722
7%
2351
3%
718
27%
718
13%
1808
February21st to endNight
29%
592
9%
1776
4%
592
34%
592
16%
1342
March1st to 10thNight
25%
720
6%
2160
4%
720
29%
720
16%
1630
March11th to 20thNight
29%
720
11%
2070
5%
720
35%
720
20%
1495
March21st to endNight
31%
792
6%
2057
2%
792
34%
792
17%
1587
April1st to 10thNight
35%
720
9%
1800
3%
720
37%
720
23%
1312
April11th to 20thNight
31%
561
10%
1629
5%
561
35%
561
20%
1146
April21st to endNight
34%
540
9%
1620
5%
540
39%
540
21%
1082
May1st to 10thNight
37%
378
9%
1458
8%
378
43%
378
18%
964
May11th to 20thNight
45%
354
9%
1322
10%
354
48%
354
22%
816
May21st to endNight
41%
388
6%
1358
5%
388
43%
388
17%
958
June1st to 10thNight
37%
360
3%
1260
1%
360
38%
360
18%
859
June11th to 20thNight
36%
360
1%
1260
0%
360
36%
360
15%
905
June21st to endNight
50%
360
3%
1260
0%
360
50%
360
30%
716
July1st to 10thNight
58%
350
5%
1225
1%
350
58%
350
35%
643
July11th to 20thNight
52%
348
12%
1224
7%
348
58%
348
38%
623
July21st to endNight
63%
394
16%
1488
21%
372
74%
372
42%
642
August1st to 10thNight
65%
358
20%
1424
24%
356
74%
356
38%
665
August11th to 20thNight
64%
443
24%
1511
24%
443
69%
443
42%
743
August21st to endNight
55%
612
22%
1800
15%
612
59%
612
38%
994
September1st to 10thNight
47%
720
18%
1800
8%
720
52%
720
38%
1127
September11th to 20thNight
53%
720
19%
1930
11%
720
57%
720
33%
1229
September21st to endNight
39%
720
17%
1980
10%
720
45%
720
31%
1253
October1st to 10thNight
37%
720
15%
2020
8%
720
43%
720
26%
1344
October11th to 20thNight
32%
720
12%
2340
6%
720
39%
720
22%
1518
October21st to endNight
27%
792
9%
2574
4%
792
34%
792
16%
1859
November1st to 10thNight
19%
740
6%
2405
3%
740
23%
740
11%
1897
November11th to 20thNight
20%
931
7%
2779
2%
931
25%
931
11%
2211
November21st to endNight
21%
950
4%
2850
2%
950
23%
950
11%
2340
December1st to 10thNight
22%
950
4%
2850
2%
950
23%
950
9%
2416
December11th to 20thNight
20%
950
2%
3507
1%
949
21%
949
5%
3156
December21st to endNight
17%
1030
3%
5180
1%
1026
21%
1026
5%
4065

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
5%7%49%8%5%7%7%7%9%32%
77831
Night
49%5%11%8%5%6%6%7%9%31%
81193
TransparencyDay
46%15%17%15%7%1
77547
Night
46%15%17%15%6%1
81057
SeeingDay
10%17%35%26%10%2
14107
Night
6%9%43%31%10%1
23385

By Month

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 10thDay
112%8%22%14%7%8%7%6%5%10%
2219
11th to 20thDay
18%5%12%11%6%6%6%7%9%28%
2457
21st to endDay
314%11%19%11%5%6%7%6%6%13%
2794
February1st to 10thDay
17%5%9%12%5%8%9%10%11%23%
1520
11th to 20thDay
16%5%8%10%6%8%8%11%13%25%
1588
21st to endDay
27%49%12%6%9%9%9%9%24%
1480
March1st to 10thDay
26%5%9%7%5%9%8%10%11%28%
1800
11th to 20thDay
25%49%9%6%9%9%8%10%30%
1889
21st to endDay
39%5%8%9%6%8%10%9%10%23%
2295
April1st to 10thDay
6%9%5%8%9%6%6%7%9%9%26%
2160
11th to 20thDay
6%11%5%9%7%47%6%9%9%29%
2282
21st to endDay
7%10%48%8%5%7%6%7%8%29%
2340
May1st to 10thDay
8%10%48%7%46%6%7%9%30%
2498
11th to 20thDay
9%8%48%7%46%5%7%8%33%
2568
21st to endDay
15%9%38%7%45%5%6%7%30%
2917
June1st to 10thDay
15%9%48%6%45%6%6%7%30%
2700
11th to 20thDay
13%8%48%7%5%6%6%7%8%27%
2700
21st to endDay
7%5%26%5%48%7%8%8%40%
2700
July1st to 10thDay
6%5%25%5%36%6%8%9%45%
2700
11th to 20thDay
6%325%5%36%6%7%8%49%
2691
21st to endDay
2314435%5%6%9%58%
2741
August1st to 10thDay
4325%6%35%6%8%9%48%
2507
11th to 20thDay
5%4245%25%6%6%9%54%
2388
21st to endDay
6%5%246%46%6%7%9%45%
2555
September1st to 10thDay
6%6%245%35%6%6%9%47%
2160
11th to 20thDay
7%5%25%7%46%6%6%9%43%
2029
21st to endDay
7%7%37%7%45%7%6%9%37%
1980
October1st to 10thDay
6%7%36%7%46%6%7%9%39%
1937
11th to 20thDay
45%38%7%45%7%9%11%37%
1620
21st to endDay
38%38%7%5%7%6%8%11%34%
1782
November1st to 10thDay
48%6%10%10%5%9%8%8%9%23%
1672
11th to 20thDay
15%5%11%10%7%9%9%9%8%25%
1378
21st to endDay
15%5%12%13%7%8%9%11%12%18%
1330
December1st to 10thDay
38%413%12%7%10%9%8%9%18%
1330
11th to 20thDay
212%8%19%13%7%7%5%7%7%12%
1682
21st to endDay
29%9%17%12%7%10%8%6%7%14%
2442
January1st to 10thNight
215%9%24%13%6%8%6%5%5%7%
4726
11th to 20thNight
18%6%13%10%5%8%8%9%10%23%
4469
21st to endNight
320%12%18%9%46%6%6%6%11%
4862
February1st to 10thNight
210%7%11%11%6%9%7%9%8%18%
2660
11th to 20thNight
110%6%10%9%5%7%9%8%9%26%
2349
21st to endNight
17%5%11%10%7%8%6%8%8%28%
1776
March1st to 10thNight
17%48%8%5%7%8%10%12%31%
2160
11th to 20thNight
27%36%6%46%7%8%11%40%
2070
21st to endNight
38%37%7%47%9%10%11%31%
2057
April1st to 10thNight
49%45%6%45%7%7%11%39%
1800
11th to 20thNight
49%37%6%36%7%9%9%37%
1629
21st to endNight
48%36%6%46%6%6%10%41%
1620
May1st to 10thNight
7%7%36%6%45%6%6%8%41%
1458
11th to 20thNight
5%8%36%5%445%6%9%45%
1322
21st to endNight
13%8%36%5%5%46%6%7%36%
1358
June1st to 10thNight
12%6%35%437%5%5%12%38%
1260
11th to 20thNight
11%7%36%7%45%7%8%9%34%
1260
21st to endNight
5%415%435%6%7%10%50%
1260
July1st to 10thNight
43145%345%6%8%57%
1260
11th to 20thNight
4214325%5%6%10%58%
1266
21st to endNight
311332335%8%68%
1576
August1st to 10thNight
33134245%6%9%59%
1432
11th to 20thNight
5%21332346%10%60%
1511
21st to endNight
44244245%7%8%56%
1800
September1st to 10thNight
6%3144245%7%10%54%
1800
11th to 20thNight
7%5%25%43446%8%51%
1930
21st to endNight
6%6%24435%6%7%9%48%
1980
October1st to 10thNight
5%6%46%5%35%5%7%10%44%
2020
11th to 20thNight
37%26%6%36%6%7%10%44%
2340
21st to endNight
38%49%7%45%7%8%11%35%
2574
November1st to 10thNight
5%11%6%8%7%5%6%8%9%10%25%
2405
11th to 20thNight
38%6%11%11%5%8%7%9%10%23%
2779
21st to endNight
28%6%15%13%6%8%7%8%9%17%
2850
December1st to 10thNight
310%5%15%14%7%10%8%6%8%14%
2850
11th to 20thNight
112%6%22%15%7%8%7%7%6%10%
3510
21st to endNight
29%9%21%14%8%8%6%6%6%10%
5214

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
63%20%12%321
2219
11th to 20thDay
51%12%14%13%7%4
2481
21st to endDay
52%25%16%5%2
2794
February1st to 10thDay
53%17%15%9%6%
1520
11th to 20thDay
49%20%17%11%3
1596
21st to endDay
51%17%17%11%5%
1480
March1st to 10thDay
51%19%17%9%4
1800
11th to 20thDay
49%18%16%13%4
1890
21st to endDay
55%19%16%7%2
2295
April1st to 10thDay
53%16%20%8%2
2160
11th to 20thDay
50%15%19%14%2
2282
21st to endDay
52%14%18%13%3
2340
May1st to 10thDay
49%15%17%14%4
2498
11th to 20thDay
47%13%19%16%5%
2572
21st to endDay
53%11%17%15%31
2918
June1st to 10thDay
53%10%14%15%6%1
2700
11th to 20thDay
53%14%16%13%4
2700
21st to endDay
37%15%19%18%9%1
2700
July1st to 10thDay
34%10%19%21%13%3
2626
11th to 20thDay
31%11%17%20%16%4
2610
21st to endDay
23%9%14%27%24%3
2589
August1st to 10thDay
29%14%17%23%14%4
2490
11th to 20thDay
27%10%20%27%15%1
2388
21st to endDay
34%12%17%26%10%1
2555
September1st to 10thDay
32%10%20%25%11%1
2160
11th to 20thDay
37%12%17%25%8%1
2029
21st to endDay
42%13%20%19%6%
1980
October1st to 10thDay
42%12%18%22%5%
1937
11th to 20thDay
41%17%20%18%5%
1620
21st to endDay
45%18%21%13%4
1782
November1st to 10thDay
58%17%13%10%2
1672
11th to 20thDay
52%18%17%10%3
1378
21st to endDay
50%19%19%8%3
1330
December1st to 10thDay
58%16%13%10%2
1330
11th to 20thDay
63%18%10%7%2
1684
21st to endDay
46%21%16%11%5%
2442
January1st to 10thNight
66%19%10%42
4726
11th to 20thNight
50%15%14%11%8%3
4507
21st to endNight
58%20%13%6%3
4862
February1st to 10thNight
60%13%14%9%4
2660
11th to 20thNight
51%16%19%11%3
2351
21st to endNight
49%14%20%11%5%1
1776
March1st to 10thNight
45%18%22%10%5%
2160
11th to 20thNight
37%19%22%15%6%
2070
21st to endNight
44%19%21%12%4
2057
April1st to 10thNight
37%17%27%14%5%
1800
11th to 20thNight
42%14%23%17%5%
1629
21st to endNight
39%12%23%19%5%1
1620
May1st to 10thNight
40%13%20%18%8%
1458
11th to 20thNight
35%12%23%24%5%
1322
21st to endNight
47%11%17%20%4
1358
June1st to 10thNight
40%15%16%21%7%1
1260
11th to 20thNight
48%12%17%18%5%
1260
21st to endNight
27%12%23%25%12%1
1260
July1st to 10thNight
24%10%20%26%16%4
1225
11th to 20thNight
24%7%19%25%21%4
1224
21st to endNight
16%8%15%33%24%3
1488
August1st to 10thNight
19%9%19%31%17%4
1424
11th to 20thNight
20%8%19%36%16%1
1511
21st to endNight
25%8%20%32%14%1
1800
September1st to 10thNight
24%14%20%27%14%1
1800
11th to 20thNight
32%10%18%28%11%2
1930
21st to endNight
30%12%25%24%9%
1980
October1st to 10thNight
35%13%18%28%6%
2020
11th to 20thNight
35%14%24%22%5%
2340
21st to endNight
43%17%21%16%21
2574
November1st to 10thNight
52%17%17%10%3
2405
11th to 20thNight
54%15%16%10%4
2779
21st to endNight
59%14%16%7%4
2850
December1st to 10thNight
64%13%12%10%1
2850
11th to 20thNight
70%15%9%5%1
3507
21st to endNight
55%19%15%8%4
5214

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
6%13%36%30%8%7%
180
11th to 20thDay
311%38%32%13%3
180
21st to endDay
311%43%31%8%4
198
February1st to 10thDay
6%19%49%19%6%1
180
11th to 20thDay
313%47%31%7%
268
21st to endDay
5%16%42%29%7%1
346
March1st to 10thDay
7%28%37%19%8%1
420
11th to 20thDay
7%28%36%20%7%2
420
21st to endDay
11%19%38%22%9%1
462
April1st to 10thDay
12%23%36%22%6%1
420
11th to 20thDay
13%26%31%21%8%1
412
21st to endDay
15%21%32%21%8%3
420
May1st to 10thDay
14%21%33%21%8%3
423
11th to 20thDay
16%16%28%26%13%1
539
21st to endDay
17%14%27%28%12%1
679
June1st to 10thDay
20%18%30%26%6%
630
11th to 20thDay
17%21%33%21%8%
630
21st to endDay
9%14%33%30%13%1
630
July1st to 10thDay
10%11%31%33%14%1
621
11th to 20thDay
9%15%35%30%10%1
609
21st to endDay
416%34%32%12%2
487
August1st to 10thDay
6%11%33%35%13%2
447
11th to 20thDay
7%14%30%33%14%3
437
21st to endDay
8%17%32%29%11%3
495
September1st to 10thDay
12%21%29%26%9%3
450
11th to 20thDay
10%16%32%30%10%2
450
21st to endDay
16%22%33%22%7%1
450
October1st to 10thDay
15%14%34%26%9%1
446
11th to 20thDay
7%19%39%22%10%2
270
21st to endDay
13%21%39%20%5%2
297
November1st to 10thDay
6%17%43%25%8%
270
11th to 20thDay
5%17%52%17%8%1
203
21st to endDay
216%41%26%9%6%
180
December1st to 10thDay
413%35%30%12%5%
180
11th to 20thDay
39%47%30%10%2
180
21st to endDay
37%43%33%12%3
198
January1st to 10thNight
6%12%49%25%7%1
950
11th to 20thNight
39%49%30%8%2
808
21st to endNight
38%52%29%6%1
836
February1st to 10thNight
5%10%50%28%8%1
760
11th to 20thNight
6%7%53%26%7%
722
21st to endNight
37%46%33%11%1
592
March1st to 10thNight
49%55%23%8%
720
11th to 20thNight
5%12%50%25%8%1
720
21st to endNight
6%9%46%29%9%1
792
April1st to 10thNight
7%11%42%33%9%
720
11th to 20thNight
8%11%44%31%6%
561
21st to endNight
7%12%44%31%6%
540
May1st to 10thNight
10%9%39%32%10%1
378
11th to 20thNight
7%8%33%41%10%
354
21st to endNight
16%5%32%38%9%
389
June1st to 10thNight
12%10%37%33%8%
360
11th to 20thNight
13%10%38%29%10%
360
21st to endNight
8%8%30%41%13%
360
July1st to 10thNight
5%5%26%49%15%
350
11th to 20thNight
5%435%42%14%
348
21st to endNight
2427%51%16%
394
August1st to 10thNight
5%324%46%22%
358
11th to 20thNight
5%5%23%44%24%
443
21st to endNight
6%9%26%40%18%
612
September1st to 10thNight
8%6%36%33%15%2
720
11th to 20thNight
9%5%29%37%18%3
720
21st to endNight
10%9%38%31%11%1
720
October1st to 10thNight
9%8%41%32%9%1
720
11th to 20thNight
6%10%46%29%8%1
720
21st to endNight
8%13%47%25%6%1
792
November1st to 10thNight
10%12%50%22%6%
740
11th to 20thNight
8%16%47%23%5%
931
21st to endNight
411%50%26%8%1
950
December1st to 10thNight
6%10%48%26%9%1
950
11th to 20thNight
48%49%30%9%
950
21st to endNight
47%49%30%9%
1045
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