Mesquite Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mesquite Springs clear sky chart from 2005-11-05 to 2017-09-21.

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
69%
15472
36%
46854
28%
15438
77%
15438
58%
20824

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
63%
716
29%
2506
23%
716
75%
716
52%
1052
January16th to endNight
60%
768
34%
2503
27%
768
73%
768
45%
1202
February1st to 15thNight
62%
700
35%
2104
28%
697
73%
697
51%
1005
February16th to endNight
56%
632
33%
1895
27%
632
68%
632
50%
922
March1st to 15thNight
59%
720
32%
2160
24%
720
74%
720
55%
992
March16th to endNight
59%
768
35%
2022
21%
768
69%
768
53%
1035
April1st to 15thNight
56%
719
34%
1799
15%
719
65%
719
57%
921
April16th to endNight
58%
705
37%
1785
15%
705
68%
705
64%
855
May1st to 15thNight
63%
539
35%
1619
22%
539
71%
539
57%
698
May16th to endNight
65%
561
31%
1684
23%
561
71%
561
56%
750
June1st to 15thNight
75%
372
35%
1452
37%
372
83%
372
61%
502
June16th to endNight
86%
360
38%
1440
43%
360
93%
360
75%
436
July1st to 15thNight
90%
340
32%
1360
40%
340
92%
340
57%
505
July16th to endNight
83%
456
36%
1490
38%
428
84%
428
57%
612
August1st to 15thNight
79%
680
36%
1754
24%
677
81%
677
74%
803
August16th to endNight
87%
764
43%
1910
28%
764
88%
764
79%
867
September1st to 15thNight
83%
720
41%
1842
28%
720
87%
720
74%
850
September16th to endNight
82%
680
46%
1881
39%
680
89%
680
83%
754
October1st to 15thNight
71%
660
40%
1820
33%
660
78%
660
64%
840
October16th to endNight
75%
704
41%
2203
39%
704
83%
704
63%
907
November1st to 15thNight
72%
700
39%
2275
36%
700
82%
700
64%
921
November16th to endNight
72%
720
38%
2340
34%
720
82%
720
60%
978
December1st to 15thNight
65%
720
34%
2340
26%
720
77%
720
47%
1106
December16th to endNight
55%
768
32%
2670
24%
768
69%
768
37%
1311

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
111212246%74%
48003
Night
112212336%73%
47042
TransparencyDay
11%37%17%27%33%
47682
Night
12%47%18%27%29%
46864
SeeingDay
312%37%31%11%2
5735
Night
3419%41%27%3
15483

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
22122347%72%
1432
16th to endDay
4312212436%65%
1717
February1st to 15thDay
111221236%7%68%
1751
16th to endDay
4312312248%65%
1579
March1st to 15thDay
11121226%8%70%
1800
16th to endDay
111231345%8%67%
2199
April1st to 15thDay
1212212346%71%
2149
16th to endDay
111112226%77%
2175
May1st to 15thDay
11112347%75%
2331
16th to endDay
121212347%72%
2429
June1st to 15thDay
1112237%77%
2504
16th to endDay
1112385%
2520
July1st to 15thDay
111213345%72%
2520
16th to endDay
11111335%7%71%
2573
August1st to 15thDay
11111113383%
2194
16th to endDay
11122483%
2292
September1st to 15thDay
111123482%
2116
16th to endDay
1112387%
1871
October1st to 15thDay
12112235%76%
1807
16th to endDay
11222335%76%
1669
November1st to 15thDay
112112236%75%
1584
16th to endDay
211111246%75%
1620
December1st to 15thDay
113214338%66%
1620
16th to endDay
231331325%7%64%
1551
January1st to 15thNight
212212337%72%
2506
16th to endNight
3313323335%67%
2503
February1st to 15thNight
222313347%67%
2101
16th to endNight
441221235%7%64%
1895
March1st to 15thNight
112222448%68%
2160
16th to endNight
11122235%5%7%66%
2022
April1st to 15thNight
2212213246%70%
1799
16th to endNight
1213345%75%
1785
May1st to 15thNight
12213347%72%
1619
16th to endNight
1112312346%70%
1684
June1st to 15thNight
11122225%79%
1452
16th to endNight
111112386%
1440
July1st to 15thNight
111224445%72%
1440
16th to endNight
1221335%6%70%
1592
August1st to 15thNight
11211222380%
1763
16th to endNight
11222481%
1910
September1st to 15thNight
1212235%78%
1842
16th to endNight
112485%
1881
October1st to 15thNight
211213336%74%
1820
16th to endNight
111112245%77%
2203
November1st to 15thNight
111212226%77%
2275
16th to endNight
211212336%74%
2340
December1st to 15thNight
2212313346%68%
2340
16th to endNight
4213323246%64%
2670

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
12%5%13%31%29%7%
1432
16th to endDay
20%5%11%25%25%11%
1717
February1st to 15thDay
14%6%10%26%29%13%
1751
16th to endDay
16%5%10%24%31%10%
1579
March1st to 15thDay
11%410%25%31%16%
1800
16th to endDay
13%5%10%26%27%16%
2199
April1st to 15thDay
13%48%21%31%20%
2149
16th to endDay
9%37%19%34%25%
2175
May1st to 15thDay
8%37%17%32%30%
2331
16th to endDay
12%47%15%35%26%
2432
June1st to 15thDay
8%249%25%49%
2504
16th to endDay
5%11416%69%
2520
July1st to 15thDay
12%248%15%56%
2371
16th to endDay
11%36%9%18%50%
2413
August1st to 15thDay
6%236%16%64%
2179
16th to endDay
6%137%22%59%
2292
September1st to 15thDay
6%249%18%58%
2116
16th to endDay
5%129%35%46%
1871
October1st to 15thDay
10%35%15%36%29%
1807
16th to endDay
10%45%14%36%28%
1669
November1st to 15thDay
11%37%25%37%14%
1584
16th to endDay
10%49%27%33%15%
1620
December1st to 15thDay
16%6%14%24%30%6%
1620
16th to endDay
20%6%12%28%21%9%
1551
January1st to 15thNight
12%6%12%28%30%9%
2506
16th to endNight
20%49%25%24%16%
2503
February1st to 15thNight
16%5%10%27%26%14%
2112
16th to endNight
17%5%10%25%31%9%
1895
March1st to 15thNight
12%6%8%24%31%16%
2160
16th to endNight
15%5%8%25%30%14%
2022
April1st to 15thNight
14%49%19%35%17%
1799
16th to endNight
9%46%18%36%24%
1785
May1st to 15thNight
9%5%6%14%32%31%
1620
16th to endNight
12%47%14%30%29%
1685
June1st to 15thNight
9%239%24%49%
1452
16th to endNight
5%12418%67%
1440
July1st to 15thNight
11%45%9%11%58%
1360
16th to endNight
14%35%10%15%51%
1490
August1st to 15thNight
9%137%16%60%
1754
16th to endNight
7%249%19%58%
1910
September1st to 15thNight
9%2410%17%56%
1842
16th to endNight
41310%30%49%
1881
October1st to 15thNight
12%35%15%32%31%
1820
16th to endNight
9%36%13%34%32%
2203
November1st to 15thNight
10%26%23%36%19%
2275
16th to endNight
11%49%20%33%21%
2340
December1st to 15thNight
16%7%10%28%28%8%
2340
16th to endNight
21%7%11%27%23%10%
2670

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%13%48%28%3
60
16th to endDay
7%6%40%26%18%
183
February1st to 15thDay
6%9%40%30%12%
266
16th to endDay
9%19%39%23%8%
238
March1st to 15thDay
417%37%26%12%1
270
16th to endDay
6%21%38%26%6%
288
April1st to 15thDay
9%24%35%21%6%2
269
16th to endDay
7%26%41%18%41
270
May1st to 15thDay
319%44%23%6%2
288
16th to endDay
5%16%35%30%10%1
330
June1st to 15thDay
215%40%28%13%
315
16th to endDay
13%30%33%16%4
315
July1st to 15thDay
35%35%36%14%3
305
16th to endDay
15%34%38%14%5%
327
August1st to 15thDay
28%46%26%12%3
315
16th to endDay
436%35%15%7%
332
September1st to 15thDay
1438%41%11%2
315
16th to endDay
17%29%45%14%1
276
October1st to 15thDay
110%43%32%9%1
255
16th to endDay
212%32%37%13%1
181
November1st to 15thDay
15%14%37%36%4
90
16th to endDay
25%35%42%14%
90
December1st to 15thDay
212%34%44%6%
90
16th to endDay
27%37%37%14%
67
January1st to 15thNight
3326%45%17%4
720
16th to endNight
5%424%42%19%3
768
February1st to 15thNight
3424%41%23%2
704
16th to endNight
6%6%27%38%18%1
632
March1st to 15thNight
16%28%38%20%4
720
16th to endNight
29%25%39%20%2
768
April1st to 15thNight
5%8%26%38%17%2
719
16th to endNight
18%28%35%23%1
705
May1st to 15thNight
28%22%45%19%2
540
16th to endNight
37%20%40%26%1
563
June1st to 15thNight
2415%40%36%1
372
16th to endNight
129%45%38%3
360
July1st to 15thNight
1447%42%3
340
16th to endNight
18%44%43%1
456
August1st to 15thNight
1113%49%32%2
680
16th to endNight
17%43%42%4
764
September1st to 15thNight
11%43%39%4
720
16th to endNight
1212%39%40%4
680
October1st to 15thNight
2320%37%28%7%
660
16th to endNight
2414%40%31%6%
704
November1st to 15thNight
1318%38%31%6%
700
16th to endNight
4217%41%30%3
720
December1st to 15thNight
5%321%45%21%1
720
16th to endNight
7%7%25%41%16%1
768
Page generated at 2017-09-22 04:35:35. Version ac04

Copyright 2017 A. Danko


Mesquite Springs Clear Sky Chart | Charts Home