Lloydminster
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lloydminster clear sky chart from 2005-11-05 to 2017-09-20.

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
35%
15367
10%
46782
6%
15340
39%
15340
16%
33405

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
28%
895
7%
2685
3%
895
32%
895
12%
2067
January16th to endNight
25%
960
13%
2880
5%
960
33%
960
13%
2136
February1st to 15thNight
33%
724
7%
2369
6%
721
36%
721
12%
1778
February16th to endNight
35%
632
12%
2052
10%
632
39%
632
14%
1518
March1st to 15thNight
32%
720
12%
2095
7%
720
37%
720
16%
1567
March16th to endNight
35%
759
11%
2103
7%
759
37%
759
14%
1631
April1st to 15thNight
36%
539
14%
1692
8%
539
42%
539
18%
1162
April16th to endNight
35%
540
14%
1566
8%
540
41%
540
18%
1079
May1st to 15thNight
42%
480
9%
1380
6%
480
44%
480
23%
914
May16th to endNight
39%
374
2%
1309
1%
374
40%
374
15%
902
June1st to 15thNight
35%
360
0%
1149
0%
360
35%
360
13%
821
June16th to endNight
43%
360
0%
1112
0%
360
43%
360
17%
761
July1st to 15thNight
53%
340
0%
1190
0%
340
53%
340
23%
702
July16th to endNight
55%
376
4%
1239
3%
354
58%
354
26%
716
August1st to 15thNight
59%
456
8%
1388
7%
454
61%
454
26%
860
August16th to endNight
49%
573
16%
1719
11%
573
55%
573
30%
1025
September1st to 15thNight
50%
540
15%
1758
13%
540
53%
540
25%
1076
September16th to endNight
50%
666
19%
1879
13%
666
56%
666
36%
1112
October1st to 15thNight
36%
660
17%
1980
10%
660
42%
660
19%
1381
October16th to endNight
32%
778
15%
2313
8%
778
38%
778
19%
1604
November1st to 15thNight
28%
875
14%
2450
8%
875
32%
875
16%
1851
November16th to endNight
24%
900
10%
2637
3%
900
30%
900
11%
2043
December1st to 15thNight
23%
900
5%
2859
3%
900
26%
900
9%
2328
December16th to endNight
26%
960
9%
2978
3%
960
31%
960
9%
2371

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%8%47%6%35%5%6%7%31%
48077
Night
9%9%48%7%45%5%5%7%31%
46936
TransparencyDay
49%8%17%18%5%
47727
Night
49%7%15%19%6%
46790
SeeingDay
14%13%21%27%16%5%
6168
Night
12%18%22%29%14%2
15377

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
11%13%5%9%8%47%46%5%22%
1253
16th to endDay
7%12%6%10%6%45%5%6%5%28%
1344
February1st to 15thDay
8%10%411%10%5%7%5%5%6%23%
1497
16th to endDay
8%14%9%13%9%36%5%5%5%17%
1422
March1st to 15thDay
10%13%5%9%6%5%7%5%6%7%21%
1863
16th to endDay
11%14%6%10%8%3445%6%25%
2120
April1st to 15thDay
12%11%5%7%7%35%447%30%
2254
16th to endDay
18%9%36%5%245%5%7%30%
2394
May1st to 15thDay
9%6%37%6%46%5%6%6%36%
2568
16th to endDay
16%7%26%6%46%45%8%30%
2802
June1st to 15thDay
16%7%37%6%36%5%7%7%27%
2808
16th to endDay
18%7%36%6%35%5%7%8%27%
2844
July1st to 15thDay
11%5%25%5%26%6%6%10%37%
2700
16th to endDay
9%425%5%45%5%7%9%39%
2846
August1st to 15thDay
13%5%25%5%345%6%8%38%
2563
16th to endDay
9%6%245%345%6%8%42%
2483
September1st to 15thDay
12%6%26%424446%43%
2202
16th to endDay
11%5%245%245%5%9%43%
1850
October1st to 15thDay
15%11%36%5%3445%6%34%
1650
16th to endDay
9%11%5%6%6%345%5%7%34%
1546
November1st to 15thDay
11%11%6%7%7%3446%7%29%
1408
16th to endDay
8%10%7%12%10%4446%7%22%
1320
December1st to 15thDay
10%13%7%12%7%47%5%6%7%15%
1098
16th to endDay
5%11%8%11%9%5%7%6%6%8%16%
1242
January1st to 15thNight
9%10%5%10%8%5%6%6%7%7%22%
2685
16th to endNight
6%11%48%10%47%5%5%7%28%
2880
February1st to 15thNight
6%9%5%10%10%47%5%7%7%24%
2366
16th to endNight
5%11%5%11%9%45%45%7%27%
2052
March1st to 15thNight
8%11%49%7%5%6%5%6%7%27%
2095
16th to endNight
10%13%7%8%8%46%45%6%25%
2100
April1st to 15thNight
9%7%47%7%36%5%7%8%32%
1692
16th to endNight
15%10%47%324347%36%
1566
May1st to 15thNight
11%7%36%5%4445%7%39%
1379
16th to endNight
15%7%26%7%36%5%5%6%32%
1309
June1st to 15thNight
13%8%48%6%46%5%48%29%
1149
16th to endNight
14%5%26%445%6%7%9%32%
1112
July1st to 15thNight
8%3235%36%5%6%10%43%
1260
16th to endNight
8%214435%6%6%10%47%
1323
August1st to 15thNight
8%4144346%7%12%42%
1395
16th to endNight
6%425%5%2446%9%46%
1719
September1st to 15thNight
12%5%145%2446%6%47%
1758
16th to endNight
8%42342446%9%49%
1879
October1st to 15thNight
12%10%46%43445%7%35%
1980
16th to endNight
9%11%5%6%5%3445%7%34%
2313
November1st to 15thNight
14%12%47%7%45%45%7%29%
2450
16th to endNight
6%12%6%11%9%45%446%27%
2637
December1st to 15thNight
10%12%6%11%9%5%6%5%5%8%17%
2859
16th to endNight
5%11%6%11%11%5%7%5%6%7%19%
2978

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
61%6%13%12%5%
1253
16th to endDay
56%6%12%15%7%1
1344
February1st to 15thDay
60%5%16%13%4
1497
16th to endDay
67%5%9%11%5%
1422
March1st to 15thDay
59%8%15%12%2
1863
16th to endDay
59%7%13%14%4
2121
April1st to 15thDay
52%7%15%16%6%1
2254
16th to endDay
52%8%13%18%6%1
2394
May1st to 15thDay
44%7%14%24%8%
2568
16th to endDay
49%7%15%18%8%
2807
June1st to 15thDay
52%10%15%15%5%
2808
16th to endDay
52%9%18%16%3
2844
July1st to 15thDay
39%10%24%22%3
2541
16th to endDay
39%11%26%20%2
2667
August1st to 15thDay
41%10%24%20%2
2545
16th to endDay
36%9%23%25%4
2483
September1st to 15thDay
39%8%18%24%7%1
2202
16th to endDay
36%8%19%28%7%
1850
October1st to 15thDay
50%6%17%22%3
1650
16th to endDay
47%7%18%21%4
1546
November1st to 15thDay
51%9%15%18%5%
1408
16th to endDay
60%9%15%11%3
1320
December1st to 15thDay
66%8%9%13%1
1098
16th to endDay
63%8%12%11%3
1242
January1st to 15thNight
58%6%17%13%3
2685
16th to endNight
54%7%13%17%6%1
2880
February1st to 15thNight
55%8%15%14%6%
2377
16th to endNight
55%5%13%17%7%
2052
March1st to 15thNight
52%7%16%16%5%
2095
16th to endNight
57%6%12%16%6%
2103
April1st to 15thNight
46%7%16%19%9%
1692
16th to endNight
48%413%17%14%1
1566
May1st to 15thNight
43%5%12%24%14%1
1380
16th to endNight
49%7%11%21%7%2
1309
June1st to 15thNight
50%8%15%19%5%
1149
16th to endNight
43%9%21%18%6%
1112
July1st to 15thNight
32%11%24%26%5%
1190
16th to endNight
30%10%25%27%5%
1239
August1st to 15thNight
31%12%26%25%4
1388
16th to endNight
31%7%20%30%9%
1719
September1st to 15thNight
36%7%16%26%9%4
1758
16th to endNight
30%6%17%34%8%2
1879
October1st to 15thNight
47%7%13%24%8%
1980
16th to endNight
47%6%17%23%5%
2313
November1st to 15thNight
55%6%12%18%6%
2450
16th to endNight
57%7%16%13%4
2637
December1st to 15thNight
64%7%13%11%2
2859
16th to endNight
61%8%13%12%3
2978

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
15%321%26%30%3
60
16th to endDay
20%429%23%17%4
64
February1st to 15thDay
7%12%32%25%18%2
79
16th to endDay
20%328%28%16%2
81
March1st to 15thDay
15%16%31%26%7%1
216
16th to endDay
15%15%28%25%11%3
288
April1st to 15thDay
15%18%26%29%7%3
269
16th to endDay
24%15%17%23%15%3
324
May1st to 15thDay
9%20%20%31%13%5%
468
16th to endDay
15%17%17%24%16%8%
517
June1st to 15thDay
15%19%23%23%13%4
495
16th to endDay
15%15%20%24%15%7%
495
July1st to 15thDay
13%11%16%31%21%7%
475
16th to endDay
12%14%19%27%20%5%
515
August1st to 15thDay
15%9%12%23%28%9%
452
16th to endDay
10%8%23%31%23%3
332
September1st to 15thDay
20%11%23%25%15%4
315
16th to endDay
11%13%26%33%9%4
253
October1st to 15thDay
34%6%25%24%5%3
90
16th to endDay
16%10%23%32%15%1
96
November1st to 15thDay
15%337%34%6%2
90
16th to endDay
11%8%25%25%20%8%
70
December1st to 15thDay
6%120%46%16%8%
60
16th to endDay
7%434%25%21%6%
64
January1st to 15thNight
11%20%24%29%11%1
900
16th to endNight
12%22%29%27%6%1
960
February1st to 15thNight
9%19%21%34%14%1
728
16th to endNight
9%18%21%28%17%4
632
March1st to 15thNight
9%19%26%31%10%2
720
16th to endNight
13%20%18%26%17%3
759
April1st to 15thNight
10%21%23%28%13%2
539
16th to endNight
17%20%18%28%12%1
540
May1st to 15thNight
9%20%21%29%17%1
480
16th to endNight
13%20%17%24%18%4
375
June1st to 15thNight
15%20%18%27%16%2
360
16th to endNight
16%18%16%25%21%2
360
July1st to 15thNight
10%13%15%36%22%
340
16th to endNight
6%19%14%36%20%3
376
August1st to 15thNight
8%10%14%31%28%5%
456
16th to endNight
9%9%24%33%21%1
573
September1st to 15thNight
15%11%16%37%17%1
540
16th to endNight
7%12%25%37%16%
666
October1st to 15thNight
17%12%25%27%15%1
660
16th to endNight
15%13%29%28%11%
778
November1st to 15thNight
17%18%25%26%9%2
875
16th to endNight
10%24%25%28%9%2
900
December1st to 15thNight
14%20%25%23%12%3
900
16th to endNight
8%20%24%27%15%4
960
Page generated at 2017-09-21 05:18:22. Version ac04

Copyright 2017 A. Danko


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