Jasper Marmot Meadows
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jasper Marmot Meadows clear sky chart from 2005-11-05 to 2017-12-20.

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
27%
15437
7%
47924
4%
15404
31%
15404
14%
36232

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
16%
921
4%
2856
3%
916
18%
916
8%
2381
January16th to endNight
16%
771
10%
2703
4%
771
23%
771
9%
2109
February1st to 15thNight
19%
700
5%
2464
3%
696
23%
696
9%
1938
February16th to endNight
29%
632
10%
1966
9%
632
33%
632
16%
1446
March1st to 15thNight
14%
720
8%
2160
3%
720
20%
720
13%
1665
March16th to endNight
25%
768
6%
2016
2%
768
28%
768
14%
1588
April1st to 15thNight
28%
698
8%
1778
3%
698
32%
698
13%
1379
April16th to endNight
31%
447
7%
1527
6%
447
33%
447
11%
1182
May1st to 15thNight
45%
359
5%
1425
5%
359
47%
359
12%
1027
May16th to endNight
41%
374
1%
1300
0%
374
41%
374
13%
983
June1st to 15thNight
37%
360
0%
1080
0%
360
37%
360
13%
845
June16th to endNight
41%
360
0%
1080
0%
360
41%
360
17%
795
July1st to 15thNight
49%
340
0%
1020
0%
340
49%
340
22%
688
July16th to endNight
52%
376
3%
1292
2%
354
53%
354
19%
849
August1st to 15thNight
57%
360
5%
1432
7%
358
58%
358
17%
944
August16th to endNight
44%
532
14%
1678
12%
532
48%
532
22%
1093
September1st to 15thNight
44%
720
11%
1800
6%
720
45%
720
26%
1273
September16th to endNight
36%
716
12%
1959
6%
716
40%
716
23%
1364
October1st to 15thNight
27%
720
7%
2173
5%
720
30%
720
14%
1675
October16th to endNight
20%
768
9%
2496
5%
768
25%
768
13%
1883
November1st to 15thNight
16%
812
5%
2667
2%
812
20%
812
11%
2067
November16th to endNight
16%
975
6%
2925
2%
975
20%
975
12%
2299
December1st to 15thNight
22%
988
8%
2980
5%
988
25%
988
13%
2287
December16th to endNight
18%
1020
7%
3147
2%
1020
22%
1020
12%
2472

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
8%11%5%10%9%46%6%6%7%22%
48951
Night
48%49%8%47%7%7%9%27%
48067
Cloud CoverDay
9%11%5%10%8%46%6%6%7%22%
48951
Night
5%9%5%9%8%47%7%7%9%26%
48070
TransparencyDay
60%9%14%11%3
48599
Night
52%11%18%13%4
47924
SeeingDay
19%16%31%21%8%1
6828
Night
10%12%39%26%10%
15443

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 15thDay
28%5%10%10%6%7%6%8%11%22%
1093
16th to endDay
27%411%8%5%8%7%10%10%24%
1518
February1st to 15thDay
38%5%11%8%47%7%9%9%24%
1400
16th to endDay
17%6%15%13%6%8%6%7%7%19%
1506
March1st to 15thDay
8%5%12%11%6%8%7%9%9%20%
1800
16th to endDay
110%8%16%12%5%8%8%8%8%13%
2206
April1st to 15thDay
414%10%15%11%5%7%6%45%14%
2170
16th to endDay
6%16%7%14%10%45%45%7%16%
2433
May1st to 15thDay
7%17%7%11%9%3445%6%20%
2525
16th to endDay
16%15%6%9%8%37%445%17%
2808
June1st to 15thDay
21%13%5%11%8%46%445%13%
2880
16th to endDay
15%12%6%11%9%5%6%6%6%5%15%
2880
July1st to 15thDay
15%10%47%8%47%5%5%6%23%
2880
16th to endDay
10%9%5%10%9%46%6%6%6%23%
2784
August1st to 15thDay
12%9%48%8%47%5%6%7%25%
2520
16th to endDay
12%10%47%8%45%5%5%8%27%
2522
September1st to 15thDay
11%12%47%5%445%5%5%33%
2160
16th to endDay
10%10%47%7%45%46%7%31%
2001
October1st to 15thDay
5%13%5%10%9%45%6%7%8%24%
1786
16th to endDay
5%9%48%9%47%8%7%10%25%
1728
November1st to 15thDay
18%410%10%6%8%8%8%7%24%
1504
16th to endDay
17%5%9%8%47%7%7%10%29%
1365
December1st to 15thDay
26%5%11%9%5%9%7%9%8%25%
1306
16th to endDay
16%49%9%6%8%8%7%10%28%
1176
January1st to 15thNight
28%6%11%10%5%8%7%8%10%20%
2856
16th to endNight
16%48%10%6%9%8%7%11%25%
2703
February1st to 15thNight
38%410%11%6%8%7%8%9%22%
2452
16th to endNight
17%6%10%9%5%9%7%7%10%24%
1966
March1st to 15thNight
7%5%10%10%5%8%9%8%10%24%
2160
16th to endNight
19%6%10%9%48%7%9%10%20%
2012
April1st to 15thNight
110%6%10%8%5%7%6%7%8%25%
1778
16th to endNight
6%12%5%10%7%37%6%6%8%24%
1527
May1st to 15thNight
6%11%38%7%46%7%7%6%29%
1424
16th to endNight
13%10%47%7%36%6%48%26%
1300
June1st to 15thNight
15%11%5%7%6%47%6%6%8%20%
1080
16th to endNight
12%6%48%8%46%6%6%9%25%
1080
July1st to 15thNight
13%5%245%36%5%7%9%36%
1080
16th to endNight
6%5%37%7%47%7%6%7%37%
1384
August1st to 15thNight
11%6%36%6%35%6%5%8%35%
1440
16th to endNight
9%6%35%5%35%7%7%9%37%
1678
September1st to 15thNight
10%8%26%6%345%47%39%
1800
16th to endNight
8%7%25%5%35%6%7%9%37%
1959
October1st to 15thNight
412%410%7%45%5%6%8%28%
2173
16th to endNight
39%48%8%47%7%9%9%26%
2496
November1st to 15thNight
28%5%8%7%5%8%8%8%9%25%
2667
16th to endNight
19%410%8%47%7%8%11%25%
2925
December1st to 15thNight
27%5%12%10%46%7%7%9%26%
2980
16th to endNight
6%5%10%9%5%9%8%8%11%23%
3147

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
28%6%10%10%48%7%8%11%20%
1093
16th to endDay
28%5%10%9%5%7%7%8%11%23%
1518
February1st to 15thDay
29%5%13%10%46%7%8%9%23%
1400
16th to endDay
17%7%14%13%5%7%7%7%7%20%
1506
March1st to 15thDay
9%6%10%10%6%8%8%8%8%21%
1800
16th to endDay
111%8%15%13%5%8%7%7%7%13%
2206
April1st to 15thDay
418%10%15%8%5%6%5%5%5%14%
2170
16th to endDay
8%18%8%12%8%45%446%17%
2433
May1st to 15thDay
8%18%7%10%7%35%447%21%
2525
16th to endDay
17%15%6%8%7%45%5%45%18%
2808
June1st to 15thDay
24%13%5%9%7%36%445%14%
2880
16th to endDay
17%11%6%10%9%46%5%5%5%16%
2880
July1st to 15thDay
16%9%47%7%45%6%5%7%25%
2880
16th to endDay
13%8%5%10%7%5%6%6%5%6%24%
2784
August1st to 15thDay
13%8%39%7%46%5%6%7%26%
2520
16th to endDay
13%10%47%6%45%5%5%7%28%
2522
September1st to 15thDay
13%10%37%6%35%45%5%34%
2160
16th to endDay
12%10%47%7%2445%7%32%
2001
October1st to 15thDay
7%13%5%10%8%45%6%7%6%24%
1786
16th to endDay
6%9%49%7%48%7%7%9%24%
1728
November1st to 15thDay
19%5%9%9%6%7%7%7%9%24%
1504
16th to endDay
29%49%8%47%6%7%10%28%
1365
December1st to 15thDay
28%412%10%6%8%5%7%7%25%
1306
16th to endDay
16%5%9%10%5%9%7%7%10%26%
1176
January1st to 15thNight
210%7%12%11%5%9%7%7%9%17%
2855
16th to endNight
27%411%9%6%9%7%7%11%21%
2703
February1st to 15thNight
49%5%11%10%5%8%7%7%9%21%
2452
16th to endNight
18%5%9%9%5%9%7%8%9%24%
1966
March1st to 15thNight
8%5%10%10%5%8%8%8%11%22%
2160
16th to endNight
19%6%10%8%49%7%9%10%21%
2016
April1st to 15thNight
211%6%11%8%47%6%6%8%26%
1778
16th to endNight
8%11%5%11%6%36%6%6%8%25%
1527
May1st to 15thNight
6%12%39%7%36%6%7%7%30%
1424
16th to endNight
14%10%46%5%46%5%6%8%28%
1300
June1st to 15thNight
16%10%48%6%37%5%6%9%21%
1080
16th to endNight
13%6%47%5%5%7%6%6%8%29%
1080
July1st to 15thNight
14%6%14435%5%7%8%36%
1080
16th to endNight
7%5%25%7%46%7%7%8%37%
1384
August1st to 15thNight
12%7%25%6%346%5%9%35%
1440
16th to endNight
10%4245%35%7%7%8%38%
1678
September1st to 15thNight
11%9%26%6%34447%40%
1800
16th to endNight
8%7%25%5%35%6%6%9%37%
1959
October1st to 15thNight
5%13%5%9%8%46%6%6%7%27%
2173
16th to endNight
49%5%9%8%45%8%9%9%25%
2496
November1st to 15thNight
210%5%10%8%5%8%7%8%9%24%
2667
16th to endNight
19%5%10%8%5%8%6%8%11%24%
2925
December1st to 15thNight
28%6%12%9%46%6%7%8%24%
2980
16th to endNight
7%6%11%10%6%8%8%8%10%20%
3147

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
54%16%18%5%4
1093
16th to endDay
52%13%15%9%6%2
1518
February1st to 15thDay
54%11%15%12%5%
1400
16th to endDay
61%8%11%11%5%
1506
March1st to 15thDay
58%12%15%10%3
1800
16th to endDay
68%9%13%6%1
2206
April1st to 15thDay
72%6%10%8%1
2170
16th to endDay
68%8%13%7%1
2433
May1st to 15thDay
63%7%13%10%5%
2525
16th to endDay
68%6%12%9%3
2813
June1st to 15thDay
72%6%9%8%2
2880
16th to endDay
68%7%12%8%3
2880
July1st to 15thDay
58%8%12%14%5%
2711
16th to endDay
59%8%15%13%3
2613
August1st to 15thDay
56%9%16%13%4
2503
16th to endDay
54%7%13%19%4
2522
September1st to 15thDay
52%5%15%19%6%1
2160
16th to endDay
53%7%16%16%6%1
2001
October1st to 15thDay
57%10%14%13%3
1786
16th to endDay
54%12%17%13%1
1728
November1st to 15thDay
55%13%18%10%2
1504
16th to endDay
49%13%21%9%41
1365
December1st to 15thDay
56%10%12%14%4
1306
16th to endDay
50%13%18%10%5%1
1176
January1st to 15thNight
61%14%14%5%31
2856
16th to endNight
56%12%12%10%42
2703
February1st to 15thNight
58%11%15%8%41
2464
16th to endNight
52%8%16%16%5%1
1966
March1st to 15thNight
53%11%19%11%3
2160
16th to endNight
53%12%20%10%2
2016
April1st to 15thNight
55%9%18%13%2
1778
16th to endNight
55%12%17%12%2
1527
May1st to 15thNight
50%11%16%15%6%
1425
16th to endNight
53%11%17%13%3
1300
June1st to 15thNight
59%8%19%10%3
1080
16th to endNight
50%10%21%14%4
1080
July1st to 15thNight
42%9%23%18%6%
1020
16th to endNight
41%10%22%20%4
1292
August1st to 15thNight
44%10%23%18%3
1432
16th to endNight
39%10%21%22%6%
1678
September1st to 15thNight
44%7%19%20%8%
1800
16th to endNight
41%10%22%17%6%
1959
October1st to 15thNight
52%12%15%15%3
2173
16th to endNight
51%12%19%14%2
2496
November1st to 15thNight
54%13%20%8%3
2667
16th to endNight
53%14%16%9%41
2925
December1st to 15thNight
54%10%16%13%4
2980
16th to endNight
55%12%16%9%4
3147

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
30%53%8%8%
60
16th to endDay
6%442%32%9%4
64
February1st to 15thDay
13%15%50%15%6%
60
16th to endDay
7%18%44%17%13%
222
March1st to 15thDay
12%35%35%11%4
270
16th to endDay
14%23%40%17%2
288
April1st to 15thDay
19%23%34%18%3
269
16th to endDay
21%22%30%16%7%1
270
May1st to 15thDay
17%18%34%20%6%2
302
16th to endDay
22%10%22%24%17%2
523
June1st to 15thDay
28%13%26%21%9%1
675
16th to endDay
20%15%30%22%9%1
675
July1st to 15thDay
20%13%29%24%10%1
645
16th to endDay
18%13%34%23%9%1
452
August1st to 15thDay
15%10%30%27%12%3
315
16th to endDay
21%16%36%17%7%
332
September1st to 15thDay
26%16%28%19%6%1
315
16th to endDay
22%22%26%21%5%1
315
October1st to 15thDay
20%20%33%16%6%3
280
16th to endDay
11%18%27%29%11%2
144
November1st to 15thDay
15%13%46%15%7%4
100
16th to endDay
8%15%28%27%8%10%
90
December1st to 15thDay
38%30%33%15%8%
90
16th to endDay
19%38%30%13%5%
72
January1st to 15thNight
10%17%46%20%5%1
921
16th to endNight
8%20%46%16%7%
771
February1st to 15thNight
9%15%43%22%8%
704
16th to endNight
5%8%44%29%10%1
632
March1st to 15thNight
5%16%53%18%6%
720
16th to endNight
6%12%40%31%8%
768
April1st to 15thNight
6%14%35%30%11%
698
16th to endNight
12%12%35%31%8%
447
May1st to 15thNight
11%7%25%41%13%
360
16th to endNight
17%6%28%25%20%1
375
June1st to 15thNight
20%326%31%17%
360
16th to endNight
15%8%26%32%16%
360
July1st to 15thNight
16%7%22%35%18%
340
16th to endNight
8%6%22%42%20%
376
August1st to 15thNight
15%313%35%29%1
360
16th to endNight
15%7%28%36%11%
532
September1st to 15thNight
16%8%25%29%18%1
720
16th to endNight
13%10%34%26%13%
716
October1st to 15thNight
12%12%37%29%6%1
720
16th to endNight
11%13%47%21%5%
768
November1st to 15thNight
9%18%47%17%5%
812
16th to endNight
8%16%51%17%5%1
975
December1st to 15thNight
9%13%44%24%6%
988
16th to endNight
412%51%21%8%1
1020
Page generated at 2017-12-21 05:04:49. Version ac04

Copyright 2017 A. Danko


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