Aqua Fria Peak
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Aqua Fria Peak clear sky chart from 2005-11-05 to 2018-02-22.

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
39%
16459
28%
48893
12%
16411
54%
16411
34%
25710

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
34%
900
30%
2641
13%
895
51%
895
37%
1298
January16th to endNight
30%
832
34%
2704
17%
832
52%
832
36%
1225
February1st to 15thNight
24%
764
26%
2374
9%
760
42%
760
30%
1223
February16th to endNight
15%
660
35%
1978
7%
660
43%
660
30%
972
March1st to 15thNight
29%
720
29%
2091
9%
720
47%
720
32%
1101
March16th to endNight
25%
687
33%
2031
9%
687
47%
687
34%
1017
April1st to 15thNight
21%
539
29%
1798
7%
539
46%
539
28%
878
April16th to endNight
24%
540
29%
1800
9%
540
50%
540
28%
891
May1st to 15thNight
33%
540
24%
1751
12%
539
50%
539
30%
929
May16th to endNight
39%
563
27%
1537
11%
561
54%
561
35%
856
June1st to 15thNight
49%
540
25%
1440
12%
540
59%
540
45%
773
June16th to endNight
57%
540
22%
1440
15%
540
64%
540
41%
826
July1st to 15thNight
68%
510
14%
1360
11%
510
71%
510
30%
898
July16th to endNight
71%
564
13%
1564
13%
531
70%
531
27%
1000
August1st to 15thNight
70%
539
12%
1734
12%
536
71%
536
23%
1126
August16th to endNight
69%
573
18%
1910
18%
573
73%
573
27%
1167
September1st to 15thNight
59%
540
23%
1800
17%
540
67%
540
30%
1067
September16th to endNight
59%
537
34%
1935
28%
537
71%
537
39%
934
October1st to 15thNight
43%
696
34%
2136
16%
696
58%
696
40%
1064
October16th to endNight
44%
768
39%
2304
16%
768
61%
768
45%
1094
November1st to 15thNight
41%
917
36%
2437
13%
917
56%
917
49%
1157
November16th to endNight
35%
975
38%
2535
14%
975
51%
975
44%
1291
December1st to 15thNight
23%
975
29%
2681
6%
975
43%
975
34%
1368
December16th to endNight
24%
1040
29%
2912
10%
1040
41%
1040
30%
1555

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
44244245%6%7%52%
49352
Night
231332346%8%59%
49078
Cloud CoverDay
4424435%5%5%7%51%
49350
Night
23133245%5%8%58%
49078
TransparencyDay
27%7%12%19%22%9%
49038
Night
21%7%14%23%24%9%
48894
SeeingDay
14%19%30%22%11%2
6135
Night
9%17%29%26%14%2
16459

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
121221245%9%64%
1637
16th to endDay
131332235%7%63%
1872
February1st to 15thDay
42442345%8%58%
1816
16th to endDay
425%42346%8%57%
1642
March1st to 15thDay
15%34435%45%7%55%
1866
16th to endDay
36%244245%5%6%55%
2192
April1st to 15thDay
26%23325%47%7%54%
2150
16th to endDay
36%25%42445%8%50%
2160
May1st to 15thDay
8%7%25%435%45%6%46%
2196
16th to endDay
5%3134245%5%7%54%
2574
June1st to 15thDay
3323435%5%6%8%54%
2520
16th to endDay
3213436%7%6%8%52%
2520
July1st to 15thDay
8%5%36%6%46%7%8%7%34%
2520
16th to endDay
9%5%37%7%37%9%8%9%28%
2494
August1st to 15thDay
11%6%27%6%36%6%6%8%33%
2214
16th to endDay
10%6%36%5%36%5%6%7%37%
2292
September1st to 15thDay
11%6%25%5%35%5%6%8%38%
2160
16th to endDay
5%31442345%459%
2025
October1st to 15thDay
6%313323346%61%
1821
16th to endDay
2313312235%70%
1920
November1st to 15thDay
12122347%7%66%
1736
16th to endDay
131332345%6%62%
1755
December1st to 15thDay
32322245%9%61%
1606
16th to endDay
143432346%10%54%
1664
January1st to 15thNight
21332345%7%65%
2641
16th to endNight
12232335%7%66%
2704
February1st to 15thNight
42431335%9%59%
2364
16th to endNight
41322435%7%64%
1978
March1st to 15thNight
5%2332336%8%59%
2091
16th to endNight
2312223348%64%
2031
April1st to 15thNight
241222345%9%59%
1798
16th to endNight
35%13323347%62%
1800
May1st to 15thNight
6%413324447%55%
1751
16th to endNight
441332335%8%59%
1536
June1st to 15thNight
2224245%8%8%60%
1440
16th to endNight
4213425%6%6%10%50%
1440
July1st to 15thNight
5%325%5%46%7%9%9%40%
1440
16th to endNight
4425%5%36%7%9%12%37%
1671
August1st to 15thNight
6%425%436%7%8%10%38%
1743
16th to endNight
6%4145%36%6%9%11%40%
1910
September1st to 15thNight
7%415%425%6%7%10%44%
1800
16th to endNight
5%41222235%6%63%
1935
October1st to 15thNight
421321334468%
2136
16th to endNight
2312212345%68%
2304
November1st to 15thNight
1212335%7%70%
2437
16th to endNight
1212313347%67%
2535
December1st to 15thNight
31331335%9%63%
2681
16th to endNight
32441346%10%58%
2912

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
12222135%48%63%
1637
16th to endDay
1324414446%61%
1872
February1st to 15thDay
415%5%235%5%8%57%
1816
16th to endDay
415%43445%8%56%
1642
March1st to 15thDay
16%25%435%45%7%54%
1866
16th to endDay
36%24425%447%53%
2190
April1st to 15thDay
26%24335%5%6%7%53%
2150
16th to endDay
37%25%5%25%45%8%49%
2160
May1st to 15thDay
7%7%35%5%25%45%6%46%
2196
16th to endDay
5%4234245%6%7%54%
2574
June1st to 15thDay
3224435%46%8%54%
2520
16th to endDay
2213436%7%6%8%52%
2520
July1st to 15thDay
7%5%47%7%46%7%7%8%33%
2520
16th to endDay
9%6%37%7%48%8%9%7%27%
2494
August1st to 15thDay
9%6%37%7%46%5%6%8%32%
2214
16th to endDay
9%7%36%6%46%5%5%7%36%
2292
September1st to 15thDay
9%7%26%6%45%5%7%6%38%
2160
16th to endDay
4324423445%58%
2025
October1st to 15thDay
5%313323346%60%
1821
16th to endDay
2313313235%70%
1920
November1st to 15thDay
2122145%6%7%65%
1736
16th to endDay
1323423447%61%
1755
December1st to 15thDay
3242236%48%60%
1606
16th to endDay
1335%4245%49%54%
1664
January1st to 15thNight
213324448%63%
2641
16th to endNight
1212324447%64%
2704
February1st to 15thNight
425%32345%8%59%
2364
16th to endNight
4124245%48%61%
1978
March1st to 15thNight
4233245%5%9%58%
2091
16th to endNight
2313224347%63%
2031
April1st to 15thNight
14232245%5%7%59%
1798
16th to endNight
35%24322346%61%
1800
May1st to 15thNight
45%2442445%6%55%
1751
16th to endNight
331322435%8%60%
1536
June1st to 15thNight
11124245%7%9%59%
1440
16th to endNight
32135%25%6%7%11%50%
1440
July1st to 15thNight
5%326%5%47%6%9%10%38%
1440
16th to endNight
4435%6%26%8%9%12%35%
1671
August1st to 15thNight
5%435%5%37%8%8%9%38%
1743
16th to endNight
5%3245%46%6%9%12%39%
1910
September1st to 15thNight
6%4245%35%6%7%10%43%
1800
16th to endNight
441222336%6%61%
1935
October1st to 15thNight
331232234467%
2136
16th to endNight
2312313345%68%
2304
November1st to 15thNight
122445%7%69%
2437
16th to endNight
1212314448%65%
2535
December1st to 15thNight
32331345%7%63%
2681
16th to endNight
22442446%9%57%
2912

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
15%6%13%25%32%5%
1638
16th to endDay
19%5%14%22%25%12%
1872
February1st to 15thDay
22%5%15%25%21%9%
1817
16th to endDay
22%413%22%28%9%
1642
March1st to 15thDay
24%6%11%20%27%9%
1866
16th to endDay
26%5%10%22%27%7%
2192
April1st to 15thDay
25%5%12%23%24%9%
2150
16th to endDay
28%6%12%20%23%9%
2160
May1st to 15thDay
35%5%11%17%23%6%
2196
16th to endDay
26%5%13%16%23%14%
2578
June1st to 15thDay
24%6%12%16%19%19%
2520
16th to endDay
24%8%11%17%20%18%
2520
July1st to 15thDay
41%11%14%12%12%8%
2371
16th to endDay
45%13%16%17%6%
2338
August1st to 15thDay
44%12%13%14%10%4
2199
16th to endDay
42%9%12%18%14%3
2292
September1st to 15thDay
39%9%13%18%13%5%
2160
16th to endDay
25%5%10%18%28%12%
2025
October1st to 15thDay
22%6%8%18%30%13%
1821
16th to endDay
16%47%20%37%12%
1920
November1st to 15thDay
12%6%12%23%31%13%
1736
16th to endDay
18%48%23%29%14%
1755
December1st to 15thDay
17%6%18%23%24%8%
1606
16th to endDay
22%8%15%24%22%6%
1664
January1st to 15thNight
16%6%12%29%27%7%
2641
16th to endNight
15%5%15%25%29%9%
2704
February1st to 15thNight
22%5%17%26%21%6%
2374
16th to endNight
17%6%13%24%28%10%
1978
March1st to 15thNight
20%6%12%26%27%6%
2091
16th to endNight
19%411%22%31%9%
2031
April1st to 15thNight
20%6%13%26%23%10%
1798
16th to endNight
22%5%12%24%24%10%
1800
May1st to 15thNight
25%5%13%20%25%8%
1752
16th to endNight
22%7%14%19%20%15%
1537
June1st to 15thNight
19%7%14%18%19%21%
1440
16th to endNight
24%7%13%17%18%18%
1440
July1st to 15thNight
33%12%18%13%12%10%
1360
16th to endNight
31%14%27%18%7%
1564
August1st to 15thNight
34%15%20%15%9%4
1734
16th to endNight
32%12%18%21%12%2
1910
September1st to 15thNight
30%10%19%22%11%5%
1800
16th to endNight
20%6%11%21%28%11%
1935
October1st to 15thNight
19%5%9%19%33%12%
2136
16th to endNight
16%49%20%36%12%
2304
November1st to 15thNight
10%5%11%26%32%13%
2437
16th to endNight
15%48%25%30%15%
2535
December1st to 15thNight
16%6%16%30%22%7%
2681
16th to endNight
19%7%17%24%23%7%
2912

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%24%22%20%10%
135
16th to endDay
13%31%28%18%5%2
144
February1st to 15thDay
13%28%34%20%3
135
16th to endDay
32%29%23%9%7%
100
March1st to 15thDay
15%31%33%17%1
156
16th to endDay
23%33%32%7%1
288
April1st to 15thDay
18%40%30%8%1
269
16th to endDay
23%39%29%6%
270
May1st to 15thDay
18%27%33%14%41
333
16th to endDay
11%21%36%19%9%1
517
June1st to 15thDay
8%15%31%24%17%2
495
16th to endDay
36%29%32%23%5%
495
July1st to 15thDay
10%326%29%23%7%
475
16th to endDay
14%117%39%22%4
353
August1st to 15thDay
16%332%34%10%2
315
16th to endDay
15%5%25%38%12%1
332
September1st to 15thDay
9%9%39%28%10%2
315
16th to endDay
13%16%38%21%6%3
180
October1st to 15thDay
11%25%31%19%9%3
135
16th to endDay
9%22%29%24%10%4
144
November1st to 15thDay
12%22%30%25%8%
135
16th to endDay
17%35%25%14%6%
135
December1st to 15thDay
20%31%26%14%6%
135
16th to endDay
19%40%25%13%2
144
January1st to 15thNight
11%20%30%24%9%2
900
16th to endNight
9%27%31%19%9%2
832
February1st to 15thNight
8%24%40%21%4
764
16th to endNight
14%28%40%15%1
660
March1st to 15thNight
10%26%31%22%9%
720
16th to endNight
11%25%36%20%5%
687
April1st to 15thNight
11%27%37%17%4
539
16th to endNight
12%25%35%21%5%
540
May1st to 15thNight
9%19%33%27%9%
540
16th to endNight
8%16%32%29%11%
563
June1st to 15thNight
28%33%37%16%1
540
16th to endNight
4426%37%26%1
540
July1st to 15thNight
6%12%41%34%3
510
16th to endNight
6%16%32%43%10%
564
August1st to 15thNight
7%18%33%41%6%
539
16th to endNight
6%113%32%38%6%
573
September1st to 15thNight
8%221%34%29%2
540
16th to endNight
8%7%19%40%20%2
537
October1st to 15thNight
5%15%33%29%14%2
696
16th to endNight
8%14%28%27%15%4
768
November1st to 15thNight
8%17%30%30%10%1
917
16th to endNight
9%21%31%23%12%1
975
December1st to 15thNight
11%27%36%15%7%1
975
16th to endNight
12%28%31%20%6%
1040
Page generated at 2018-02-23 09:21:37. Version ac04

Copyright 2018 A. Danko


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