Saskatchewan Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Saskatchewan Beach clear sky chart from 2005-11-06 to 2026-02-16.

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	9% 8% 3 8% 5% 5% 5% 4 6% 8% 38%	134307
	Night	8% 9% 4 10% 6% 6% 5% 4 6% 7% 36%	135291
Transparency	Day	44% 5% 16% 25% 10% 1	134020
	Night	46% 5% 15% 23% 10% 1	135160
Seeing	Day	13% 7% 28% 30% 18% 4	17625
	Night	13% 6% 29% 36% 14% 1	27218

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% 5% 13% 10% 9% 7% 5% 6% 5% 20%	4105
	11th to 20th	Day	3 8% 3 10% 10% 9% 9% 7% 10% 8% 22%	4453
	21st to end	Day	4 11% 4 12% 8% 6% 6% 4 6% 9% 29%	5188
February	1st to 10th	Day	7% 13% 5% 14% 9% 7% 7% 5% 7% 5% 22%	1731
	11th to 20th	Day	8% 12% 4 10% 5% 6% 8% 6% 7% 7% 27%	1800
	21st to end	Day	5% 10% 5% 15% 10% 8% 7% 4 8% 6% 24%	1598
March	1st to 10th	Day	7% 12% 5% 15% 7% 5% 6% 4 4 7% 29%	4500
	11th to 20th	Day	6% 13% 7% 16% 6% 5% 4 3 5% 7% 29%	4784
	21st to end	Day	9% 12% 5% 13% 7% 4 5% 3 5% 6% 31%	5880
April	1st to 10th	Day	6% 9% 3 7% 6% 5% 5% 5% 7% 8% 39%	2400
	11th to 20th	Day	14% 12% 4 9% 6% 5% 4 4 6% 7% 30%	2399
	21st to end	Day	14% 11% 3 7% 5% 5% 4 4 5% 7% 36%	2784
May	1st to 10th	Day	16% 8% 2 4 3 3 4 3 6% 7% 43%	6340
	11th to 20th	Day	14% 9% 3 7% 4 5% 5% 6% 7% 9% 31%	6298
	21st to end	Day	12% 6% 2 6% 4 4 4 4 5% 6% 46%	7110
June	1st to 10th	Day	16% 6% 2 5% 4 4 5% 4 6% 9% 39%	3158
	11th to 20th	Day	18% 7% 3 7% 6% 5% 5% 4 6% 7% 31%	3200
	21st to end	Day	10% 5% 2 6% 4 5% 6% 5% 8% 8% 41%	3200
July	1st to 10th	Day	5% 3 2 5% 4 4 5% 5% 8% 10% 49%	7060
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 4 7% 9% 44%	6675
	21st to end	Day	6% 3 1 4 3 4 4 4 6% 8% 58%	6898
August	1st to 10th	Day	8% 5% 2 5% 4 4 5% 3 6% 7% 51%	4552
	11th to 20th	Day	7% 4 1 5% 4 4 5% 4 7% 10% 50%	4483
	21st to end	Day	10% 5% 2 5% 3 3 3 3 4 7% 54%	4415
September	1st to 10th	Day	11% 4 2 5% 3 4 5% 4 6% 8% 48%	2400
	11th to 20th	Day	13% 7% 2 6% 4 4 4 4 5% 7% 43%	2395
	21st to end	Day	11% 5% 2 5% 3 3 3 3 5% 8% 51%	2159
October	1st to 10th	Day	10% 7% 3 7% 4 5% 5% 4 5% 7% 43%	3270
	11th to 20th	Day	7% 7% 3 6% 3 3 5% 4 6% 11% 45%	3120
	21st to end	Day	8% 10% 4 8% 5% 3 4 5% 6% 8% 39%	3190
November	1st to 10th	Day	13% 15% 4 9% 5% 5% 4 5% 4 6% 29%	1706
	11th to 20th	Day	7% 13% 5% 15% 8% 5% 5% 4 6% 6% 26%	1680
	21st to end	Day	9% 12% 6% 12% 7% 6% 5% 4 6% 7% 25%	1501
December	1st to 10th	Day	6% 13% 4 13% 10% 8% 7% 4 6% 6% 23%	2360
	11th to 20th	Day	7% 15% 7% 14% 9% 8% 6% 5% 5% 5% 20%	2457
	21st to end	Day	4 8% 5% 13% 7% 6% 5% 4 5% 5% 38%	3058
January	1st to 10th	Night	4 12% 6% 15% 10% 8% 7% 5% 7% 7% 21%	8772
	11th to 20th	Night	3 8% 5% 13% 9% 9% 8% 6% 8% 7% 24%	8459
	21st to end	Night	5% 11% 4 12% 7% 6% 5% 4 6% 8% 31%	9026
February	1st to 10th	Night	8% 11% 5% 13% 8% 7% 6% 5% 6% 8% 24%	2908
	11th to 20th	Night	5% 10% 4 12% 6% 6% 7% 5% 6% 9% 30%	2597
	21st to end	Night	4 6% 4 12% 8% 7% 5% 5% 7% 9% 33%	2031
March	1st to 10th	Night	6% 12% 6% 12% 7% 6% 7% 5% 6% 7% 27%	5374
	11th to 20th	Night	7% 11% 4 11% 8% 6% 5% 4 6% 8% 29%	5203
	21st to end	Night	7% 12% 5% 13% 7% 5% 6% 4 5% 7% 29%	5076
April	1st to 10th	Night	6% 9% 3 6% 5% 4 4 4 7% 8% 43%	2000
	11th to 20th	Night	13% 13% 4 8% 5% 4 4 4 6% 7% 33%	1952
	21st to end	Night	14% 8% 3 7% 5% 5% 6% 4 5% 8% 34%	1615
May	1st to 10th	Night	15% 7% 2 7% 4 3 4 3 5% 7% 43%	3640
	11th to 20th	Night	17% 7% 3 7% 4 4 5% 4 6% 8% 35%	3618
	21st to end	Night	13% 7% 2 5% 4 3 4 3 5% 7% 47%	3774
June	1st to 10th	Night	12% 5% 2 5% 4 4 4 4 7% 8% 46%	1239
	11th to 20th	Night	16% 7% 2 5% 4 5% 5% 4 6% 7% 40%	1200
	21st to end	Night	10% 4 2 6% 4 5% 4 4 8% 8% 47%	1200
July	1st to 10th	Night	6% 4 2 5% 4 4 4 5% 7% 10% 49%	2895
	11th to 20th	Night	9% 4 2 5% 4 5% 4 4 6% 8% 50%	3288
	21st to end	Night	6% 3 1 4 3 3 3 3 5% 7% 60%	3968
August	1st to 10th	Night	6% 4 2 5% 3 4 5% 4 6% 9% 53%	2608
	11th to 20th	Night	4 2 2 6% 3 4 5% 4 7% 9% 53%	2576
	21st to end	Night	7% 4 2 5% 3 4 4 4 6% 8% 54%	3489
September	1st to 10th	Night	9% 4 1 5% 4 4 4 4 5% 8% 52%	2000
	11th to 20th	Night	11% 6% 2 6% 4 4 4 4 5% 6% 47%	2005
	21st to end	Night	11% 5% 2 4 4 3 4 3 6% 7% 51%	2239
October	1st to 10th	Night	11% 7% 3 6% 3 4 4 3 6% 8% 46%	3920
	11th to 20th	Night	6% 6% 2 5% 3 4 4 4 6% 10% 50%	3996
	21st to end	Night	9% 8% 3 7% 5% 4 4 4 5% 8% 43%	4610
November	1st to 10th	Night	15% 13% 4 8% 7% 4 4 3 5% 5% 31%	2810
	11th to 20th	Night	7% 14% 5% 12% 7% 6% 5% 4 5% 6% 28%	2940
	21st to end	Night	8% 12% 6% 11% 7% 6% 5% 3 6% 7% 30%	3118
December	1st to 10th	Night	7% 14% 7% 16% 9% 7% 5% 4 4 6% 20%	5050
	11th to 20th	Night	8% 13% 5% 13% 8% 8% 8% 5% 6% 7% 19%	5955
	21st to end	Night	4 7% 4 12% 7% 6% 6% 4 5% 6% 40%	8140

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	63% 5% 12% 11% 9%	4105
	11th to 20th	Day	55% 4 16% 16% 8%	4476
	21st to end	Day	52% 4 19% 17% 7%	5188
February	1st to 10th	Day	62% 4 12% 15% 7%	1731
	11th to 20th	Day	54% 5% 12% 18% 11% 1	1809
	21st to end	Day	58% 5% 12% 17% 8%	1598
March	1st to 10th	Day	54% 5% 18% 17% 6%	4500
	11th to 20th	Day	56% 6% 16% 18% 4	4785
	21st to end	Day	53% 5% 12% 20% 9% 1	5880
April	1st to 10th	Day	40% 5% 17% 25% 11% 1	2400
	11th to 20th	Day	54% 4 13% 20% 7% 2	2399
	21st to end	Day	48% 4 14% 23% 9% 1	2784
May	1st to 10th	Day	41% 3 11% 27% 16% 2	6340
	11th to 20th	Day	46% 5% 13% 23% 12%	6302
	21st to end	Day	37% 4 11% 27% 19% 1	7110
June	1st to 10th	Day	42% 5% 13% 28% 11% 1	3158
	11th to 20th	Day	51% 5% 13% 20% 10% 1	3200
	21st to end	Day	37% 7% 18% 29% 10%	3200
July	1st to 10th	Day	28% 7% 27% 29% 10%	6984
	11th to 20th	Day	36% 5% 17% 33% 8%	6594
	21st to end	Day	25% 5% 19% 36% 15% 1	6705
August	1st to 10th	Day	32% 5% 21% 28% 14% 1	4536
	11th to 20th	Day	29% 6% 18% 38% 9% 1	4525
	21st to end	Day	31% 4 15% 37% 13% 1	4414
September	1st to 10th	Day	34% 4 15% 31% 15% 2	2400
	11th to 20th	Day	41% 5% 15% 27% 11% 2	2395
	21st to end	Day	32% 4 14% 33% 15% 2	2159
October	1st to 10th	Day	40% 3 17% 29% 10% 1	3270
	11th to 20th	Day	33% 4 15% 36% 10% 2	3120
	21st to end	Day	44% 4 18% 27% 7%	3190
November	1st to 10th	Day	57% 4 15% 17% 7% 1	1706
	11th to 20th	Day	57% 6% 15% 16% 6%	1680
	21st to end	Day	57% 8% 15% 16% 4	1501
December	1st to 10th	Day	61% 7% 16% 12% 5%	2360
	11th to 20th	Day	66% 4 18% 9% 3	2458
	21st to end	Day	48% 4 11% 22% 11% 5%	3058
January	1st to 10th	Night	61% 5% 12% 17% 6%	8773
	11th to 20th	Night	56% 5% 16% 15% 8%	8498
	21st to end	Night	51% 5% 20% 17% 7%	9026
February	1st to 10th	Night	58% 5% 12% 18% 7%	2908
	11th to 20th	Night	50% 4 14% 21% 11%	2598
	21st to end	Night	46% 5% 16% 24% 9%	2031
March	1st to 10th	Night	53% 5% 21% 16% 4	5374
	11th to 20th	Night	52% 5% 19% 19% 6%	5203
	21st to end	Night	55% 4 11% 21% 8%	5076
April	1st to 10th	Night	38% 4 14% 26% 17% 1	2000
	11th to 20th	Night	50% 5% 9% 23% 10% 3	1952
	21st to end	Night	48% 5% 10% 24% 12% 1	1615
May	1st to 10th	Night	41% 3 9% 27% 17% 3	3640
	11th to 20th	Night	46% 5% 15% 21% 12% 1	3618
	21st to end	Night	35% 6% 11% 27% 20% 1	3774
June	1st to 10th	Night	35% 4 14% 30% 14% 2	1239
	11th to 20th	Night	42% 5% 16% 23% 13% 1	1200
	21st to end	Night	33% 6% 18% 33% 10% 1	1200
July	1st to 10th	Night	29% 6% 26% 33% 6%	2862
	11th to 20th	Night	31% 5% 15% 38% 10% 1	3246
	21st to end	Night	24% 4 19% 36% 16% 3	3856
August	1st to 10th	Night	27% 6% 22% 29% 14% 1	2600
	11th to 20th	Night	24% 6% 19% 38% 12% 1	2600
	21st to end	Night	28% 4 15% 37% 15% 1	3489
September	1st to 10th	Night	31% 4 11% 31% 21% 2	2000
	11th to 20th	Night	36% 5% 16% 27% 15% 1	2005
	21st to end	Night	32% 4 13% 32% 17% 2	2239
October	1st to 10th	Night	37% 3 17% 32% 9% 2	3920
	11th to 20th	Night	31% 3 14% 38% 12% 1	3996
	21st to end	Night	40% 3 12% 34% 10% 1	4610
November	1st to 10th	Night	55% 5% 13% 19% 7% 1	2810
	11th to 20th	Night	56% 4 17% 16% 6%	2940
	21st to end	Night	53% 5% 18% 20% 4	3118
December	1st to 10th	Night	66% 7% 14% 10% 3	5050
	11th to 20th	Night	64% 5% 16% 11% 3	5954
	21st to end	Night	46% 4 10% 24% 13% 3	8140

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% 6% 30% 32% 16% 4	220
	11th to 20th	Day	12% 11% 27% 33% 15% 2	281
	21st to end	Day	15% 9% 30% 31% 13% 2	363
February	1st to 10th	Day	12% 8% 36% 32% 11% 1	330
	11th to 20th	Day	10% 5% 28% 35% 17% 4	315
	21st to end	Day	5% 6% 30% 37% 20% 2	249
March	1st to 10th	Day	14% 8% 32% 30% 13% 4	300
	11th to 20th	Day	13% 8% 34% 29% 13% 4	402
	21st to end	Day	15% 9% 30% 28% 17% 2	550
April	1st to 10th	Day	9% 13% 37% 29% 11% 2	500
	11th to 20th	Day	19% 13% 29% 26% 10% 2	517
	21st to end	Day	17% 7% 27% 31% 17% 1	700
May	1st to 10th	Day	14% 6% 26% 31% 20% 4	703
	11th to 20th	Day	14% 5% 27% 30% 18% 6%	725
	21st to end	Day	16% 7% 21% 30% 20% 6%	789
June	1st to 10th	Day	16% 11% 28% 23% 17% 5%	730
	11th to 20th	Day	20% 9% 29% 25% 14% 3	730
	21st to end	Day	12% 6% 25% 30% 22% 5%	730
July	1st to 10th	Day	9% 3 21% 33% 26% 8%	721
	11th to 20th	Day	9% 6% 24% 30% 23% 9%	718
	21st to end	Day	6% 5% 22% 34% 23% 10%	794
August	1st to 10th	Day	9% 5% 20% 35% 25% 7%	726
	11th to 20th	Day	9% 5% 20% 32% 27% 7%	715
	21st to end	Day	12% 6% 21% 31% 23% 7%	583
September	1st to 10th	Day	14% 8% 27% 30% 16% 5%	530
	11th to 20th	Day	18% 7% 26% 28% 18% 2	525
	21st to end	Day	14% 9% 25% 33% 15% 3	330
October	1st to 10th	Day	19% 6% 28% 24% 18% 4	330
	11th to 20th	Day	16% 7% 34% 26% 15% 2	330
	21st to end	Day	15% 9% 36% 28% 11% 2	363
November	1st to 10th	Day	22% 6% 32% 26% 12% 3	330
	11th to 20th	Day	14% 10% 37% 30% 8% 1	330
	21st to end	Day	12% 7% 35% 32% 12% 2	330
December	1st to 10th	Day	13% 6% 34% 34% 11% 2	330
	11th to 20th	Day	12% 10% 46% 25% 6% 1	264
	21st to end	Day	13% 3 32% 39% 10% 3	242
January	1st to 10th	Night	9% 7% 35% 34% 13% 2	1050
	11th to 20th	Night	14% 10% 33% 33% 9% 1	1050
	21st to end	Night	11% 9% 38% 30% 11% 1	1155
February	1st to 10th	Night	12% 8% 30% 35% 14% 2	1018
	11th to 20th	Night	10% 5% 30% 40% 13% 2	804
	21st to end	Night	5% 4 24% 42% 21% 4	660
March	1st to 10th	Night	12% 6% 31% 34% 15% 2	800
	11th to 20th	Night	11% 7% 33% 35% 13% 2	800
	21st to end	Night	14% 5% 29% 36% 14% 1	700
April	1st to 10th	Night	9% 7% 33% 37% 13% 1	600
	11th to 20th	Night	21% 7% 30% 32% 9% 1	593
	21st to end	Night	18% 8% 28% 38% 7% 1	600
May	1st to 10th	Night	15% 5% 27% 36% 17% 1	600
	11th to 20th	Night	16% 6% 27% 33% 16% 1	591
	21st to end	Night	20% 4 23% 33% 18% 2	650
June	1st to 10th	Night	16% 5% 27% 33% 18% 1	439
	11th to 20th	Night	19% 5% 28% 34% 15%	400
	21st to end	Night	13% 4 25% 40% 18% 1	400
July	1st to 10th	Night	7% 3 19% 49% 21% 2	390
	11th to 20th	Night	8% 2 26% 42% 20% 1	431
	21st to end	Night	6% 4 21% 42% 24% 2	657
August	1st to 10th	Night	8% 2 23% 40% 24% 3	597
	11th to 20th	Night	7% 2 19% 43% 27% 2	594
	21st to end	Night	10% 3 24% 41% 21% 1	660
September	1st to 10th	Night	11% 5% 24% 38% 22% 2	600
	11th to 20th	Night	14% 4 24% 41% 17% 1	600
	21st to end	Night	13% 5% 30% 39% 13%	639
October	1st to 10th	Night	19% 6% 21% 38% 16% 1	800
	11th to 20th	Night	14% 6% 27% 37% 13% 2	860
	21st to end	Night	17% 8% 31% 34% 9% 1	1100
November	1st to 10th	Night	21% 7% 30% 34% 8% 1	1025
	11th to 20th	Night	15% 8% 33% 31% 10% 2	1050
	21st to end	Night	13% 8% 35% 35% 8% 1	1050
December	1st to 10th	Night	12% 6% 34% 33% 14% 2	1050
	11th to 20th	Night	14% 9% 33% 33% 10% 1	1050
	21st to end	Night	12% 4 30% 37% 14% 3	1155

Page generated at 2026-02-13 00:42:13. Version ac07

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