Santa Fe (TX)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Santa Fe (TX) clear sky chart from 2005-11-05 to 2017-04-28.

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
58%
14911
23%
45575
19%
14867
62%
14867
30%
27796

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
40%
898
21%
2327
10%
895
46%
895
27%
1592
January16th to endNight
39%
960
23%
2496
11%
960
45%
960
29%
1678
February1st to 15thNight
42%
782
23%
2190
12%
778
48%
778
28%
1427
February16th to endNight
37%
497
23%
1759
15%
497
45%
497
23%
1099
March1st to 15thNight
40%
540
23%
1980
17%
540
49%
540
21%
1236
March16th to endNight
55%
576
22%
2112
20%
576
61%
576
29%
1182
April1st to 15thNight
49%
539
21%
1935
19%
539
56%
539
24%
1157
April16th to endNight
48%
534
21%
1780
19%
534
54%
534
24%
1116
May1st to 15thNight
53%
494
20%
1603
20%
494
57%
494
27%
984
May16th to endNight
72%
514
23%
1541
25%
513
74%
513
37%
885
June1st to 15thNight
82%
495
20%
1485
24%
495
82%
495
43%
802
June16th to endNight
77%
495
15%
1485
19%
495
77%
495
32%
910
July1st to 15thNight
76%
465
17%
1395
22%
465
76%
465
32%
856
July16th to endNight
84%
522
17%
1468
22%
489
85%
489
34%
869
August1st to 15thNight
89%
494
27%
1496
30%
491
89%
491
51%
740
August16th to endNight
78%
525
14%
1755
18%
525
78%
525
27%
1081
September1st to 15thNight
75%
495
14%
1815
18%
495
76%
495
25%
1106
September16th to endNight
71%
492
26%
1815
30%
492
72%
492
27%
1063
October1st to 15thNight
76%
613
32%
1933
30%
613
77%
613
43%
1004
October16th to endNight
68%
704
35%
2112
28%
704
72%
704
44%
1116
November1st to 15thNight
63%
700
27%
2100
23%
700
65%
700
33%
1260
November16th to endNight
56%
720
32%
2160
23%
720
63%
720
37%
1236
December1st to 15thNight
45%
897
24%
2337
14%
897
49%
897
26%
1621
December16th to endNight
38%
960
19%
2496
10%
960
42%
960
23%
1776

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
12%5%25%5%35%5%6%8%37%
46110
Night
11%5%2442445%8%46%
45770
TransparencyDay
41%8%13%17%13%5%
45810
Night
35%6%13%20%15%8%
45575
SeeingDay
11%213%26%29%16%
4714
Night
13%317%30%28%6%
14915

By Month

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
18%6%25%5%34437%39%
1611
16th to endDay
20%7%35%322335%42%
1728
February1st to 15thDay
18%7%35%32444441%
1681
16th to endDay
20%8%24423246%39%
1712
March1st to 15thDay
21%6%25%42335%5%38%
1980
16th to endDay
15%5%3432435%7%43%
2110
April1st to 15thDay
13%6%36%5%345%5%7%38%
2013
16th to endDay
14%7%35%435%446%39%
2127
May1st to 15thDay
11%7%27%6%45%5%7%7%32%
2014
16th to endDay
9%5%35%6%45%7%7%11%32%
2222
June1st to 15thDay
4425%6%47%6%8%11%36%
2145
16th to endDay
8%4246%48%8%10%14%27%
2145
July1st to 15thDay
10%5%35%5%36%6%10%14%25%
2145
16th to endDay
7%436%6%48%9%10%11%26%
2284
August1st to 15thDay
32136%47%9%11%15%35%
2123
16th to endDay
8%5%37%8%47%7%7%12%28%
2091
September1st to 15thDay
10%6%25%6%47%7%8%9%29%
1815
16th to endDay
13%6%26%6%45%5%6%8%34%
1815
October1st to 15thDay
9%424425%5%5%7%48%
1683
16th to endDay
10%314322336%56%
1760
November1st to 15thDay
10%423446%5%5%7%43%
1758
16th to endDay
14%5%24433235%49%
1800
December1st to 15thDay
16%7%26%425%449%35%
1620
16th to endDay
17%9%35%5%35%345%34%
1728
January1st to 15thNight
19%6%25%324346%41%
2327
16th to endNight
18%5%24424345%43%
2496
February1st to 15thNight
17%5%24423445%44%
2180
16th to endNight
14%8%345%23335%45%
1759
March1st to 15thNight
18%6%24414347%41%
1980
16th to endNight
10%5%234235%47%51%
2112
April1st to 15thNight
11%5%25%5%2446%8%43%
1935
16th to endNight
14%5%24425%45%7%42%
1780
May1st to 15thNight
9%5%245%25%5%8%10%39%
1602
16th to endNight
5%2245%25%5%8%12%46%
1539
June1st to 15thNight
331342346%11%53%
1485
16th to endNight
5%3145%36%6%7%13%41%
1485
July1st to 15thNight
5%4244245%7%14%42%
1485
16th to endNight
4224436%5%7%13%47%
1576
August1st to 15thNight
12131246%13%61%
1506
16th to endNight
43146%35%6%8%14%41%
1755
September1st to 15thNight
6%425%435%6%9%10%42%
1815
16th to endNight
10%4245%3345%8%46%
1815
October1st to 15thNight
6%313213347%60%
1933
16th to endNight
8%32332233463%
2112
November1st to 15thNight
9%424425%45%7%50%
2100
16th to endNight
11%42342334455%
2160
December1st to 15thNight
17%6%25%424447%40%
2337
16th to endNight
18%8%35%434446%37%
2496

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
45%6%6%14%18%8%
1612
16th to endDay
44%35%18%15%12%
1728
February1st to 15thDay
45%47%16%16%10%
1682
16th to endDay
47%5%8%13%18%7%
1712
March1st to 15thDay
47%5%8%14%17%6%
1980
16th to endDay
39%7%11%13%21%6%
2112
April1st to 15thDay
43%6%9%17%15%7%
2013
16th to endDay
43%6%11%17%14%5%
2127
May1st to 15thDay
46%7%13%15%10%6%
2014
16th to endDay
38%9%14%21%12%2
2226
June1st to 15thDay
34%10%18%19%15%1
2145
16th to endDay
38%15%17%20%7%
2145
July1st to 15thDay
40%11%22%20%5%
2006
16th to endDay
40%13%24%19%2
2129
August1st to 15thDay
27%13%25%27%5%
2109
16th to endDay
44%13%18%15%5%1
2091
September1st to 15thDay
44%12%16%16%6%2
1815
16th to endDay
44%8%10%16%15%4
1815
October1st to 15thDay
33%6%8%21%16%13%
1683
16th to endDay
28%38%15%28%14%
1760
November1st to 15thDay
35%7%12%18%17%8%
1758
16th to endDay
38%46%14%21%15%
1800
December1st to 15thDay
45%7%10%16%13%6%
1620
16th to endDay
50%6%7%13%14%6%
1728
January1st to 15thNight
44%45%13%20%11%
2327
16th to endNight
42%47%15%17%12%
2496
February1st to 15thNight
41%49%11%19%13%
2190
16th to endNight
43%46%14%20%11%
1759
March1st to 15thNight
43%5%9%15%16%9%
1980
16th to endNight
33%6%13%16%21%9%
2112
April1st to 15thNight
38%6%11%18%16%10%
1935
16th to endNight
40%6%11%18%14%8%
1780
May1st to 15thNight
36%8%14%21%11%7%
1603
16th to endNight
28%8%19%27%14%2
1541
June1st to 15thNight
23%6%20%25%21%
1485
16th to endNight
32%8%23%25%10%
1485
July1st to 15thNight
31%9%25%26%6%
1395
16th to endNight
27%11%27%30%2
1468
August1st to 15thNight
15%8%27%40%7%
1496
16th to endNight
31%13%26%22%5%1
1755
September1st to 15thNight
32%12%22%20%10%1
1815
16th to endNight
35%7%12%21%18%5%
1815
October1st to 15thNight
23%5%10%26%19%13%
1933
16th to endNight
25%35%18%29%17%
2112
November1st to 15thNight
33%6%11%23%17%7%
2100
16th to endNight
32%38%17%23%15%
2160
December1st to 15thNight
44%5%9%19%13%7%
2337
16th to endNight
48%5%6%15%13%10%
2496

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
25%428%31%10%
90
16th to endDay
13%6%39%30%10%
96
February1st to 15thDay
8%343%30%13%1
90
16th to endDay
11%6%39%35%7%
81
March1st to 15thDay
27%6%40%15%10%
90
16th to endDay
16%5%31%30%12%4
96
April1st to 15thDay
12%5%25%34%18%3
132
16th to endDay
18%225%30%20%1
259
May1st to 15thDay
16%223%38%17%1
271
16th to endDay
11%213%42%26%3
437
June1st to 15thDay
7%6%34%36%14%
420
16th to endDay
9%422%39%23%
420
July1st to 15thDay
7%1331%35%21%
400
16th to endDay
5%1118%40%32%
445
August1st to 15thDay
2113%45%37%
396
16th to endDay
14%5%7%33%38%
259
September1st to 15thDay
10%2416%35%31%
90
16th to endDay
5%11%52%31%
90
October1st to 15thDay
46%30%41%17%
90
16th to endDay
16%215%30%27%8%
96
November1st to 15thDay
18%125%25%22%6%
90
16th to endDay
16%426%31%13%7%
90
December1st to 15thDay
27%218%26%15%8%
90
16th to endDay
20%7%38%23%8%1
96
January1st to 15thNight
23%5%25%32%12%
900
16th to endNight
19%6%29%33%10%
960
February1st to 15thNight
20%6%26%35%11%
782
16th to endNight
16%8%32%34%8%
497
March1st to 15thNight
20%6%27%34%10%
540
16th to endNight
12%423%39%18%1
576
April1st to 15thNight
12%6%24%43%13%
539
16th to endNight
16%324%35%19%
534
May1st to 15thNight
11%224%46%13%
495
16th to endNight
4211%43%33%3
515
June1st to 15thNight
3334%52%5%
495
16th to endNight
5%1318%56%14%
495
July1st to 15thNight
6%216%55%18%
465
16th to endNight
411%60%22%
522
August1st to 15thNight
26%66%23%
494
16th to endNight
6%113%56%21%
525
September1st to 15thNight
9%5%11%52%20%
495
16th to endNight
11%5%20%46%15%
492
October1st to 15thNight
7%9%27%46%8%
613
16th to endNight
9%213%32%34%6%
704
November1st to 15thNight
11%116%36%29%5%
700
16th to endNight
12%421%37%21%2
720
December1st to 15thNight
19%5%22%32%17%1
897
16th to endNight
22%6%26%30%13%
960
Page generated at 2017-04-29 08:44:55. Version ac04

Copyright 2017 A. Danko


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