Rte 33/Big Lost River
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rte 33/Big Lost River 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
59%
15334
19%
46743
16%
15299
63%
15299
31%
28310

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
54%
722
11%
2512
10%
722
57%
722
17%
1783
January16th to endNight
55%
768
13%
2593
11%
768
59%
768
19%
1748
February1st to 15thNight
50%
700
10%
2288
8%
696
54%
696
20%
1574
February16th to endNight
50%
632
14%
1917
10%
632
56%
632
22%
1305
March1st to 15thNight
55%
720
13%
2062
11%
720
59%
720
26%
1385
March16th to endNight
50%
768
16%
2112
11%
768
54%
768
28%
1390
April1st to 15thNight
50%
653
19%
1799
10%
653
57%
653
31%
1138
April16th to endNight
51%
540
22%
1620
16%
540
55%
540
32%
972
May1st to 15thNight
55%
539
21%
1619
17%
539
58%
539
36%
930
May16th to endNight
56%
536
16%
1584
15%
536
58%
536
30%
989
June1st to 15thNight
64%
360
17%
1260
18%
360
69%
360
32%
704
June16th to endNight
72%
360
28%
1260
32%
360
80%
360
54%
529
July1st to 15thNight
83%
340
22%
1295
32%
340
86%
340
51%
523
July16th to endNight
81%
456
30%
1490
35%
428
85%
428
63%
581
August1st to 15thNight
77%
539
27%
1611
25%
536
79%
536
52%
781
August16th to endNight
77%
573
38%
1719
30%
573
79%
573
55%
811
September1st to 15thNight
75%
680
30%
1874
23%
680
79%
680
55%
953
September16th to endNight
72%
656
33%
1815
27%
656
75%
656
49%
957
October1st to 15thNight
63%
660
27%
1909
22%
660
67%
660
38%
1097
October16th to endNight
64%
704
23%
2199
20%
704
69%
704
35%
1268
November1st to 15thNight
57%
700
20%
2275
19%
700
60%
700
28%
1381
November16th to endNight
57%
868
16%
2488
11%
868
62%
868
30%
1584
December1st to 15thNight
51%
900
8%
2562
5%
900
54%
900
19%
1859
December16th to endNight
45%
960
11%
2880
7%
960
50%
960
19%
2068

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
45%25%4345%6%8%50%
47913
Night
45%25%5%345%6%8%49%
46922
TransparencyDay
30%8%14%21%16%8%
47591
Night
32%8%15%21%15%7%
46745
SeeingDay
7%8%25%30%20%7%
5698
Night
7%222%40%23%3
15345

By Month

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
49%38%7%36%5%7%9%34%
1432
16th to endDay
6%12%38%7%45%5%7%8%32%
1629
February1st to 15thDay
26%48%8%45%6%9%10%33%
1575
16th to endDay
37%47%6%46%5%7%11%35%
1555
March1st to 15thDay
37%38%5%45%5%8%11%36%
1896
16th to endDay
5%5%36%6%36%6%8%8%38%
2112
April1st to 15thDay
5%6%36%5%345%7%9%41%
2148
16th to endDay
5%6%25%5%3446%8%46%
2340
May1st to 15thDay
45%345%34448%51%
2331
16th to endDay
8%5%35%5%35%6%7%9%39%
2524
June1st to 15thDay
5%425%6%35%6%7%10%42%
2700
16th to endDay
1212213446%67%
2700
July1st to 15thDay
211232445%8%64%
2583
16th to endDay
2212313345%69%
2573
August1st to 15thDay
221232345%7%64%
2340
16th to endDay
221221335%6%68%
2483
September1st to 15thDay
4213213236%67%
2002
16th to endDay
421222345%7%63%
1815
October1st to 15thDay
8%4234345%5%6%51%
1719
16th to endDay
3415%435%5%8%7%50%
1672
November1st to 15thDay
5%6%35%5%34448%47%
1584
16th to endDay
45%25%5%35%5%6%9%46%
1458
December1st to 15thDay
48%5%9%7%46%6%5%6%35%
1395
16th to endDay
6%12%48%6%45%45%8%32%
1347
January1st to 15thNight
48%38%6%36%6%6%7%38%
2512
16th to endNight
6%9%37%6%35%45%7%40%
2593
February1st to 15thNight
39%47%7%46%5%7%8%36%
2277
16th to endNight
5%7%37%5%46%5%6%8%37%
1917
March1st to 15thNight
25%35%6%35%7%8%10%40%
2062
16th to endNight
6%5%35%5%35%6%5%9%42%
2112
April1st to 15thNight
6%6%45%5%3446%10%44%
1799
16th to endNight
5%5%36%43445%7%48%
1620
May1st to 15thNight
342442436%7%54%
1619
16th to endNight
8%425%435%48%8%42%
1584
June1st to 15thNight
5%315%5%25%6%8%9%46%
1260
16th to endNight
121231235%6%69%
1260
July1st to 15thNight
2221346%9%64%
1374
16th to endNight
11121335%6%72%
1592
August1st to 15thNight
21232345%7%63%
1620
16th to endNight
1212323346%69%
1719
September1st to 15thNight
4312212335%68%
1874
16th to endNight
421232245%6%63%
1815
October1st to 15thNight
6%31442335%6%56%
1909
16th to endNight
45%144245%6%8%52%
2199
November1st to 15thNight
46%35%42446%9%47%
2275
16th to endNight
4425%5%35%6%6%8%47%
2488
December1st to 15thNight
49%48%6%36%6%6%8%36%
2562
16th to endNight
6%12%5%6%6%35%5%5%7%34%
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
44%13%18%16%41
1432
16th to endDay
50%10%15%16%5%1
1629
February1st to 15thDay
41%16%19%17%4
1575
16th to endDay
40%15%16%20%5%1
1555
March1st to 15thDay
39%13%18%20%6%
1896
16th to endDay
39%12%18%21%6%
2112
April1st to 15thDay
37%8%20%22%10%
2148
16th to endDay
33%7%13%27%17%1
2340
May1st to 15thDay
29%6%12%30%19%2
2331
16th to endDay
37%9%16%24%11%2
2527
June1st to 15thDay
33%8%13%23%16%4
2700
16th to endDay
15%48%18%34%18%
2700
July1st to 15thDay
16%47%19%27%24%
2433
16th to endDay
16%36%13%23%37%
2413
August1st to 15thDay
17%5%8%17%28%23%
2325
16th to endDay
14%48%22%29%20%
2483
September1st to 15thDay
18%39%18%33%15%
2002
16th to endDay
19%5%13%29%24%8%
1815
October1st to 15thDay
32%8%16%28%11%3
1719
16th to endDay
29%10%18%27%14%
1672
November1st to 15thDay
36%8%20%21%11%1
1584
16th to endDay
34%10%25%20%7%2
1458
December1st to 15thDay
47%13%16%18%3
1395
16th to endDay
50%10%18%13%5%1
1347
January1st to 15thNight
44%13%16%17%5%1
2512
16th to endNight
43%10%16%19%7%2
2593
February1st to 15thNight
43%10%19%20%5%
2288
16th to endNight
42%9%17%22%5%1
1917
March1st to 15thNight
34%14%19%22%8%1
2062
16th to endNight
36%10%18%25%7%1
2112
April1st to 15thNight
35%6%16%26%12%1
1799
16th to endNight
34%6%12%28%17%
1620
May1st to 15thNight
28%7%10%28%23%2
1620
16th to endNight
35%6%14%25%14%3
1585
June1st to 15thNight
29%8%13%21%21%5%
1260
16th to endNight
14%39%15%34%22%
1260
July1st to 15thNight
15%310%18%25%26%
1295
16th to endNight
10%36%13%25%40%
1490
August1st to 15thNight
16%6%8%17%23%27%
1611
16th to endNight
16%47%16%28%26%
1719
September1st to 15thNight
18%47%16%34%19%
1874
16th to endNight
21%49%26%28%9%
1815
October1st to 15thNight
28%6%13%30%16%4
1909
16th to endNight
28%8%14%26%20%1
2199
November1st to 15thNight
35%7%18%23%11%2
2275
16th to endNight
33%10%22%21%10%2
2488
December1st to 15thNight
44%13%22%13%6%
2562
16th to endNight
48%9%18%16%5%1
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
6%115%28%23%25%
60
16th to endDay
18%8%30%30%11%
79
February1st to 15thDay
6%230%24%22%14%
90
16th to endDay
7%7%21%41%15%7%
214
March1st to 15thDay
7%430%35%20%1
270
16th to endDay
7%12%32%34%10%2
288
April1st to 15thDay
6%14%28%27%15%6%
269
16th to endDay
7%15%35%27%11%2
270
May1st to 15thDay
7%12%32%28%14%3
288
16th to endDay
10%9%20%27%21%10%
402
June1st to 15thDay
9%11%22%29%21%6%
495
16th to endDay
49%23%32%24%5%
495
July1st to 15thDay
46%21%32%26%8%
367
16th to endDay
36%35%31%17%6%
327
August1st to 15thDay
26%28%30%24%8%
315
16th to endDay
25%24%27%24%14%
332
September1st to 15thDay
7%8%22%27%20%13%
300
16th to endDay
5%5%29%21%30%7%
255
October1st to 15thDay
11%8%23%23%22%9%
159
16th to endDay
12%6%21%26%26%7%
96
November1st to 15thDay
11%17%22%36%21%
90
16th to endDay
11%5%23%50%7%2
90
December1st to 15thDay
13%219%51%9%3
83
16th to endDay
12%12%35%25%14%
64
January1st to 15thNight
8%120%42%22%4
726
16th to endNight
11%217%38%22%7%
768
February1st to 15thNight
8%124%41%20%2
704
16th to endNight
7%325%42%17%3
632
March1st to 15thNight
4326%43%21%1
720
16th to endNight
8%330%37%18%
768
April1st to 15thNight
9%428%37%17%2
653
16th to endNight
5%332%41%15%1
540
May1st to 15thNight
5%5%29%37%21%1
540
16th to endNight
9%423%34%25%2
538
June1st to 15thNight
6%321%43%23%2
360
16th to endNight
3119%45%27%3
360
July1st to 15thNight
39%49%36%1
340
16th to endNight
112%48%33%3
456
August1st to 15thNight
4111%46%33%2
539
16th to endNight
215%42%34%4
573
September1st to 15thNight
6%13%36%33%9%
680
16th to endNight
5%214%34%33%10%
656
October1st to 15thNight
8%218%40%25%3
660
16th to endNight
7%221%40%22%6%
704
November1st to 15thNight
6%224%36%26%2
700
16th to endNight
5%226%41%19%3
868
December1st to 15thNight
9%324%44%16%2
900
16th to endNight
11%424%42%14%2
960
Page generated at 2017-09-13 05:39:19. Version ac04

Copyright 2017 A. Danko


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