Lloydminster
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lloydminster clear sky chart from 2005-11-06 to 2026-07-31.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	10% 8% 3 9% 6% 5% 5% 4 7% 8% 35%	141978
	Night	7% 9% 4 10% 6% 6% 5% 4 6% 8% 34%	139693
Transparency	Day	46% 6% 16% 23% 8% 1	141674
	Night	47% 6% 16% 21% 9% 1	139582
Seeing	Day	13% 7% 27% 30% 17% 5%	17934
	Night	12% 6% 30% 35% 15% 2	26949

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	7% 12% 4 14% 10% 7% 6% 5% 6% 5% 22%	4125
	11th to 20th	Day	4 7% 3 9% 7% 7% 9% 6% 8% 8% 32%	4119
	21st to end	Day	6% 14% 4 12% 7% 6% 5% 4 6% 9% 28%	4531
February	1st to 10th	Day	7% 12% 4 15% 8% 6% 6% 5% 6% 7% 23%	1756
	11th to 20th	Day	6% 12% 5% 14% 8% 7% 7% 4 7% 7% 25%	1845
	21st to end	Day	4 12% 6% 11% 8% 7% 6% 6% 8% 8% 23%	1557
March	1st to 10th	Day	5% 10% 4 10% 7% 6% 6% 6% 9% 10% 28%	4647
	11th to 20th	Day	6% 10% 5% 13% 8% 6% 5% 4 7% 9% 29%	5109
	21st to end	Day	9% 14% 6% 16% 6% 5% 4 3 5% 6% 27%	5646
April	1st to 10th	Day	7% 12% 4 9% 7% 5% 5% 4 5% 7% 36%	2599
	11th to 20th	Day	12% 10% 4 9% 6% 5% 6% 4 6% 7% 31%	2700
	21st to end	Day	15% 10% 4 8% 5% 4 5% 4 6% 7% 33%	2822
May	1st to 10th	Day	9% 7% 3 9% 5% 5% 5% 4 6% 7% 40%	8224
	11th to 20th	Day	19% 10% 3 8% 5% 5% 6% 5% 7% 7% 26%	8750
	21st to end	Day	9% 7% 3 8% 6% 6% 6% 5% 7% 9% 36%	9649
June	1st to 10th	Day	14% 7% 4 8% 5% 5% 6% 5% 7% 8% 32%	3234
	11th to 20th	Day	19% 9% 3 8% 7% 6% 6% 5% 7% 7% 23%	3360
	21st to end	Day	14% 7% 2 7% 5% 5% 5% 5% 8% 9% 35%	3296
July	1st to 10th	Day	7% 4 2 5% 5% 5% 6% 5% 7% 9% 44%	6930
	11th to 20th	Day	12% 5% 2 6% 5% 5% 5% 5% 7% 8% 41%	6930
	21st to end	Day	8% 5% 2 6% 5% 5% 5% 4 7% 9% 44%	7527
August	1st to 10th	Day	14% 4 2 6% 4 5% 4 4 5% 7% 46%	4775
	11th to 20th	Day	8% 5% 2 6% 5% 5% 5% 4 7% 10% 43%	4201
	21st to end	Day	8% 6% 2 7% 4 5% 4 4 6% 8% 46%	4664
September	1st to 10th	Day	10% 6% 2 7% 4 5% 5% 4 6% 9% 43%	2470
	11th to 20th	Day	15% 8% 3 6% 3 3 4 3 5% 7% 42%	2314
	21st to end	Day	9% 6% 2 6% 5% 4 5% 4 6% 9% 45%	2165
October	1st to 10th	Day	7% 10% 3 7% 4 4 4 3 6% 8% 43%	3270
	11th to 20th	Day	9% 8% 3 7% 5% 4 5% 3 6% 10% 39%	3224
	21st to end	Day	7% 9% 4 9% 5% 5% 6% 5% 6% 8% 38%	2945
November	1st to 10th	Day	12% 15% 5% 10% 7% 5% 3 3 5% 7% 27%	1648
	11th to 20th	Day	6% 14% 6% 14% 8% 6% 5% 4 6% 7% 24%	1680
	21st to end	Day	6% 12% 7% 14% 9% 5% 4 3 7% 8% 26%	1470
December	1st to 10th	Day	7% 14% 5% 11% 6% 7% 6% 6% 8% 7% 21%	2064
	11th to 20th	Day	6% 15% 6% 14% 8% 7% 6% 5% 6% 7% 19%	2319
	21st to end	Day	3 8% 4 12% 9% 6% 6% 4 5% 6% 36%	3413
January	1st to 10th	Night	7% 10% 5% 14% 9% 8% 7% 6% 8% 6% 21%	8768
	11th to 20th	Night	2 8% 4 10% 8% 7% 8% 6% 7% 10% 32%	8779
	21st to end	Night	6% 12% 4 11% 8% 7% 6% 4 5% 8% 29%	9650
February	1st to 10th	Night	6% 11% 5% 11% 9% 7% 7% 5% 8% 8% 24%	2882
	11th to 20th	Night	5% 10% 4 11% 8% 7% 5% 5% 7% 8% 30%	2662
	21st to end	Night	3 9% 4 12% 9% 8% 6% 4 7% 8% 30%	2249
March	1st to 10th	Night	5% 11% 4 11% 7% 6% 6% 4 7% 9% 29%	5454
	11th to 20th	Night	4 11% 4 12% 6% 6% 6% 5% 8% 9% 28%	5110
	21st to end	Night	10% 16% 6% 12% 5% 5% 4 4 5% 7% 28%	5569
April	1st to 10th	Night	6% 10% 4 8% 6% 5% 5% 4 7% 8% 37%	2018
	11th to 20th	Night	9% 9% 4 9% 7% 5% 5% 6% 7% 8% 31%	1871
	21st to end	Night	13% 11% 4 8% 4 4 4 3 5% 8% 35%	1797
May	1st to 10th	Night	11% 7% 3 7% 4 4 4 3 5% 7% 43%	4724
	11th to 20th	Night	17% 11% 3 8% 5% 5% 5% 4 7% 7% 29%	4106
	21st to end	Night	10% 7% 3 8% 5% 5% 6% 5% 8% 9% 35%	4522
June	1st to 10th	Night	12% 8% 3 9% 5% 6% 5% 4 6% 10% 32%	1381
	11th to 20th	Night	18% 9% 3 8% 5% 5% 5% 5% 6% 7% 28%	1260
	21st to end	Night	11% 7% 3 7% 5% 5% 4 4 7% 9% 38%	1317
July	1st to 10th	Night	6% 3 1 4 4 4 5% 4 7% 11% 50%	3250
	11th to 20th	Night	9% 4 2 5% 4 4 4 4 5% 7% 51%	3250
	21st to end	Night	7% 4 2 5% 4 4 4 5% 6% 8% 50%	3537
August	1st to 10th	Night	11% 5% 2 6% 3 4 5% 4 7% 9% 44%	2378
	11th to 20th	Night	8% 5% 2 5% 4 4 5% 4 7% 10% 45%	2856
	21st to end	Night	7% 5% 2 7% 4 4 4 3 6% 9% 48%	3245
September	1st to 10th	Night	11% 5% 2 6% 4 4 4 4 6% 7% 49%	1930
	11th to 20th	Night	12% 6% 2 5% 5% 4 5% 3 5% 7% 46%	2085
	21st to end	Night	6% 5% 3 6% 4 4 4 4 7% 9% 48%	2234
October	1st to 10th	Night	8% 8% 2 7% 4 4 4 4 6% 8% 44%	3920
	11th to 20th	Night	6% 7% 4 7% 5% 4 4 3 5% 8% 48%	3920
	21st to end	Night	7% 10% 5% 9% 5% 4 4 4 6% 9% 36%	4823
November	1st to 10th	Night	14% 14% 5% 9% 6% 6% 4 4 5% 7% 27%	2870
	11th to 20th	Night	7% 12% 5% 14% 9% 7% 5% 4 6% 6% 25%	2940
	21st to end	Night	4 13% 6% 13% 7% 6% 5% 4 6% 7% 28%	3145
December	1st to 10th	Night	8% 14% 5% 14% 8% 7% 7% 5% 6% 7% 19%	5332
	11th to 20th	Night	6% 15% 6% 15% 9% 7% 6% 5% 6% 7% 19%	6093
	21st to end	Night	3 7% 3 11% 9% 7% 5% 4 5% 6% 38%	7766

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	62% 4 9% 17% 8%	4125
	11th to 20th	Day	46% 6% 17% 18% 13% 1	4140
	21st to end	Day	55% 4 17% 16% 8%	4531
February	1st to 10th	Day	59% 5% 12% 16% 7%	1756
	11th to 20th	Day	56% 6% 13% 16% 8% 1	1854
	21st to end	Day	55% 8% 13% 17% 7%	1557
March	1st to 10th	Day	48% 7% 20% 19% 6%	4647
	11th to 20th	Day	51% 7% 17% 18% 6%	5110
	21st to end	Day	57% 6% 9% 20% 9%	5646
April	1st to 10th	Day	46% 8% 16% 20% 9%	2599
	11th to 20th	Day	49% 8% 14% 20% 8% 1	2700
	21st to end	Day	48% 7% 14% 23% 8% 1	2822
May	1st to 10th	Day	43% 4 9% 26% 15% 2	8224
	11th to 20th	Day	54% 6% 10% 22% 8%	8754
	21st to end	Day	41% 8% 15% 25% 9% 2	9650
June	1st to 10th	Day	46% 10% 16% 19% 8% 1	3234
	11th to 20th	Day	56% 9% 13% 16% 4 1	3360
	21st to end	Day	43% 10% 20% 21% 6%	3296
July	1st to 10th	Day	34% 5% 26% 28% 6%	6856
	11th to 20th	Day	40% 6% 14% 32% 8%	6849
	21st to end	Day	36% 5% 23% 31% 6%	7320
August	1st to 10th	Day	37% 7% 19% 33% 4	4757
	11th to 20th	Day	35% 6% 24% 29% 5%	4241
	21st to end	Day	35% 5% 23% 30% 6%	4663
September	1st to 10th	Day	36% 9% 17% 26% 9% 2	2470
	11th to 20th	Day	42% 6% 18% 28% 6%	2314
	21st to end	Day	35% 8% 17% 28% 10% 2	2165
October	1st to 10th	Day	41% 4 22% 27% 5%	3270
	11th to 20th	Day	40% 4 16% 32% 7%	3224
	21st to end	Day	45% 5% 20% 25% 5%	2945
November	1st to 10th	Day	57% 6% 13% 17% 6%	1648
	11th to 20th	Day	59% 9% 15% 12% 6%	1680
	21st to end	Day	55% 8% 15% 17% 4	1470
December	1st to 10th	Day	59% 8% 14% 13% 5% 1	2064
	11th to 20th	Day	63% 7% 13% 14% 3	2320
	21st to end	Day	49% 4 10% 25% 11% 1	3413
January	1st to 10th	Night	60% 5% 13% 12% 10%	8769
	11th to 20th	Night	47% 5% 16% 17% 13% 1	8820
	21st to end	Night	54% 5% 15% 18% 7%	9650
February	1st to 10th	Night	55% 7% 13% 16% 9%	2882
	11th to 20th	Night	49% 7% 14% 18% 12%	2663
	21st to end	Night	49% 8% 13% 20% 10%	2249
March	1st to 10th	Night	50% 6% 19% 18% 7%	5454
	11th to 20th	Night	49% 8% 16% 19% 7%	5110
	21st to end	Night	53% 7% 9% 18% 12%	5569
April	1st to 10th	Night	42% 8% 15% 20% 15% 1	2018
	11th to 20th	Night	47% 7% 16% 17% 11% 2	1871
	21st to end	Night	46% 6% 12% 22% 11% 2	1797
May	1st to 10th	Night	40% 4 8% 28% 19% 1	4724
	11th to 20th	Night	51% 6% 11% 21% 11% 1	4106
	21st to end	Night	41% 8% 18% 23% 10%	4526
June	1st to 10th	Night	45% 9% 14% 21% 10% 1	1381
	11th to 20th	Night	52% 9% 14% 16% 8%	1260
	21st to end	Night	39% 10% 23% 21% 6% 1	1317
July	1st to 10th	Night	27% 5% 29% 29% 9%	3215
	11th to 20th	Night	33% 4 15% 35% 13%	3208
	21st to end	Night	31% 5% 22% 32% 9%	3439
August	1st to 10th	Night	35% 7% 22% 32% 4	2371
	11th to 20th	Night	33% 5% 24% 30% 7%	2882
	21st to end	Night	33% 5% 21% 33% 8%	3245
September	1st to 10th	Night	33% 7% 17% 27% 11% 4	1930
	11th to 20th	Night	37% 7% 16% 30% 8% 1	2085
	21st to end	Night	33% 6% 16% 32% 12% 2	2234
October	1st to 10th	Night	38% 4 21% 30% 6%	3920
	11th to 20th	Night	36% 4 14% 36% 10%	3920
	21st to end	Night	45% 5% 22% 24% 4	4823
November	1st to 10th	Night	58% 6% 12% 16% 7% 1	2870
	11th to 20th	Night	58% 8% 14% 15% 5%	2940
	21st to end	Night	54% 8% 16% 18% 5%	3145
December	1st to 10th	Night	64% 6% 15% 11% 4 1	5332
	11th to 20th	Night	64% 5% 15% 12% 4	6091
	21st to end	Night	46% 5% 12% 22% 13% 2	7766

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	12% 5% 28% 32% 21% 2	220
	11th to 20th	Day	12% 11% 28% 29% 18% 2	220
	21st to end	Day	13% 12% 33% 29% 10% 3	242
February	1st to 10th	Day	8% 9% 37% 26% 16% 4	272
	11th to 20th	Day	10% 8% 30% 30% 18% 4	330
	21st to end	Day	7% 7% 31% 36% 14% 5%	273
March	1st to 10th	Day	9% 11% 31% 32% 15% 2	446
	11th to 20th	Day	10% 6% 34% 30% 15% 4	540
	21st to end	Day	14% 5% 30% 33% 15% 3	594
April	1st to 10th	Day	9% 9% 31% 34% 13% 3	540
	11th to 20th	Day	15% 8% 31% 30% 13% 4	532
	21st to end	Day	17% 8% 29% 30% 12% 4	632
May	1st to 10th	Day	11% 11% 27% 32% 13% 5%	753
	11th to 20th	Day	14% 8% 26% 30% 17% 6%	775
	21st to end	Day	15% 6% 23% 31% 17% 7%	844
June	1st to 10th	Day	16% 9% 30% 29% 12% 3	780
	11th to 20th	Day	19% 9% 28% 24% 15% 6%	780
	21st to end	Day	15% 5% 22% 28% 21% 9%	780
July	1st to 10th	Day	11% 4 20% 32% 27% 6%	771
	11th to 20th	Day	11% 5% 26% 31% 19% 8%	768
	21st to end	Day	9% 4 22% 32% 25% 9%	845
August	1st to 10th	Day	12% 6% 18% 30% 26% 8%	726
	11th to 20th	Day	11% 6% 22% 31% 23% 7%	548
	21st to end	Day	13% 5% 23% 30% 21% 9%	583
September	1st to 10th	Day	14% 7% 29% 27% 17% 5%	530
	11th to 20th	Day	21% 7% 20% 32% 15% 4	530
	21st to end	Day	11% 13% 28% 31% 14% 2	495
October	1st to 10th	Day	12% 6% 30% 36% 12% 3	330
	11th to 20th	Day	18% 10% 31% 27% 11% 3	330
	21st to end	Day	13% 13% 36% 25% 12% 2	363
November	1st to 10th	Day	16% 9% 32% 30% 12% 2	330
	11th to 20th	Day	12% 9% 43% 25% 10% 1	330
	21st to end	Day	7% 11% 37% 30% 9% 5%	220
December	1st to 10th	Day	9% 6% 31% 32% 17% 5%	220
	11th to 20th	Day	10% 9% 38% 30% 13%	220
	21st to end	Day	10% 6% 27% 33% 17% 7%	242
January	1st to 10th	Night	12% 7% 33% 34% 13% 1	1050
	11th to 20th	Night	11% 7% 34% 35% 11% 1	1050
	21st to end	Night	15% 10% 36% 30% 8% 1	1155
February	1st to 10th	Night	9% 7% 29% 37% 15% 2	880
	11th to 20th	Night	10% 5% 33% 33% 16% 2	824
	21st to end	Night	6% 5% 27% 38% 20% 4	692
March	1st to 10th	Night	11% 5% 32% 39% 11% 2	840
	11th to 20th	Night	10% 5% 33% 36% 14% 2	840
	21st to end	Night	13% 6% 28% 35% 15% 3	908
April	1st to 10th	Night	9% 6% 32% 36% 15% 3	630
	11th to 20th	Night	12% 7% 33% 33% 13% 1	623
	21st to end	Night	17% 8% 24% 35% 16% 1	630
May	1st to 10th	Night	11% 7% 29% 34% 17% 1	630
	11th to 20th	Night	14% 4 27% 35% 17% 3	415
	21st to end	Night	18% 4 19% 37% 20% 2	455
June	1st to 10th	Night	13% 10% 27% 34% 15% 2	420
	11th to 20th	Night	23% 6% 22% 29% 17% 3	420
	21st to end	Night	15% 2 18% 35% 27% 3	420
July	1st to 10th	Night	10% 2 18% 47% 23% 1	410
	11th to 20th	Night	11% 3 22% 42% 21% 1	408
	21st to end	Night	7% 4 17% 43% 25% 4	458
August	1st to 10th	Night	8% 3 18% 37% 29% 5%	457
	11th to 20th	Night	11% 4 20% 40% 22% 2	594
	21st to end	Night	10% 4 25% 38% 21% 1	660
September	1st to 10th	Night	14% 5% 19% 43% 18% 2	600
	11th to 20th	Night	15% 3 21% 44% 17%	685
	21st to end	Night	9% 6% 33% 36% 15% 1	800
October	1st to 10th	Night	15% 6% 30% 36% 13% 1	800
	11th to 20th	Night	12% 4 35% 34% 13% 2	800
	21st to end	Night	14% 8% 36% 30% 10%	1015
November	1st to 10th	Night	20% 7% 33% 31% 9% 1	1025
	11th to 20th	Night	13% 8% 34% 31% 12% 2	1050
	21st to end	Night	9% 8% 37% 35% 10% 1	1050
December	1st to 10th	Night	13% 7% 33% 30% 13% 4	1050
	11th to 20th	Night	12% 9% 36% 31% 11% 2	1050
	21st to end	Night	10% 5% 33% 34% 15% 3	1155

Page generated at 2026-07-28 01:25:22. Version ac07

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