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 2024-11-30.

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% 39%	105650
	Night	8% 9% 3 9% 6% 5% 5% 4 6% 7% 39%	102517
Transparency	Day	43% 5% 16% 26% 10% 1	105405
	Night	44% 5% 16% 25% 10% 1	102409
Seeing	Day	13% 7% 27% 30% 18% 5%	16048
	Night	13% 6% 29% 36% 15% 1	25502

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% 13% 5% 14% 7% 7% 8% 6% 7% 5% 22%	2199
	11th to 20th	Day	4 8% 4 11% 9% 11% 10% 7% 8% 6% 20%	2365
	21st to end	Day	6% 13% 4 12% 7% 6% 6% 4 5% 6% 32%	2794
February	1st to 10th	Day	8% 13% 4 13% 9% 7% 8% 5% 6% 5% 23%	1565
	11th to 20th	Day	8% 13% 5% 10% 6% 6% 9% 6% 6% 6% 26%	1665
	21st to end	Day	5% 10% 5% 15% 10% 8% 7% 4 7% 6% 23%	1520
March	1st to 10th	Day	7% 13% 5% 13% 8% 6% 7% 4 5% 6% 25%	3130
	11th to 20th	Day	5% 11% 6% 13% 6% 4 4 3 5% 8% 35%	3344
	21st to end	Day	7% 9% 4 12% 7% 5% 5% 4 6% 7% 34%	4102
April	1st to 10th	Day	7% 9% 3 7% 6% 5% 5% 5% 7% 8% 38%	2280
	11th to 20th	Day	14% 13% 4 9% 6% 5% 4 4 5% 7% 30%	2278
	21st to end	Day	14% 11% 3 7% 5% 5% 4 4 5% 7% 35%	2645
May	1st to 10th	Day	20% 11% 3 5% 4 3 4 3 5% 7% 36%	4430
	11th to 20th	Day	9% 8% 2 8% 5% 5% 5% 5% 7% 9% 37%	4388
	21st to end	Day	14% 6% 2 7% 5% 5% 5% 5% 7% 7% 35%	4953
June	1st to 10th	Day	16% 6% 2 5% 5% 4 5% 4 6% 8% 39%	3000
	11th to 20th	Day	19% 7% 3 7% 6% 5% 5% 3 6% 7% 32%	3040
	21st to end	Day	10% 5% 2 6% 4 5% 6% 5% 8% 9% 41%	3040
July	1st to 10th	Day	5% 3 2 6% 4 4 5% 5% 8% 10% 48%	4936
	11th to 20th	Day	6% 4 1 5% 4 4 4 4 7% 9% 51%	4661
	21st to end	Day	4 3 1 4 3 3 3 3 5% 8% 62%	4802
August	1st to 10th	Day	8% 5% 2 5% 4 4 5% 3 6% 7% 51%	4412
	11th to 20th	Day	8% 4 1 5% 4 4 5% 4 6% 10% 50%	4343
	21st to end	Day	10% 5% 2 5% 3 3 3 3 4 7% 54%	4280
September	1st to 10th	Day	12% 4 2 5% 3 4 5% 4 6% 8% 48%	2280
	11th to 20th	Day	13% 7% 2 6% 4 4 4 4 5% 7% 43%	2275
	21st to end	Day	12% 5% 2 5% 3 3 3 3 5% 8% 50%	2051
October	1st to 10th	Day	10% 7% 3 7% 4 5% 5% 4 6% 7% 43%	3170
	11th to 20th	Day	7% 7% 3 5% 3 3 5% 4 6% 11% 46%	3024
	21st to end	Day	8% 10% 4 8% 5% 4 4 5% 6% 8% 39%	3091
November	1st to 10th	Day	14% 15% 4 9% 5% 5% 4 4 4 6% 29%	1623
	11th to 20th	Day	7% 13% 4 15% 8% 6% 5% 4 6% 7% 26%	1600
	21st to end	Day	10% 12% 7% 11% 7% 6% 5% 4 6% 7% 25%	1427
December	1st to 10th	Day	7% 13% 4 13% 10% 7% 7% 4 6% 6% 21%	1330
	11th to 20th	Day	7% 15% 6% 14% 7% 7% 6% 5% 6% 5% 22%	1517
	21st to end	Day	5% 9% 4 8% 6% 5% 4 4 4 6% 46%	2090
January	1st to 10th	Night	4 12% 6% 15% 8% 6% 5% 5% 7% 7% 25%	4730
	11th to 20th	Night	4 9% 4 15% 10% 11% 8% 5% 6% 6% 21%	4535
	21st to end	Night	6% 13% 3 9% 5% 7% 5% 4 5% 6% 35%	4873
February	1st to 10th	Night	8% 11% 5% 13% 7% 7% 6% 5% 6% 8% 25%	2632
	11th to 20th	Night	5% 11% 4 12% 7% 6% 7% 5% 6% 8% 29%	2402
	21st to end	Night	4 6% 4 12% 8% 7% 5% 5% 7% 8% 32%	1933
March	1st to 10th	Night	7% 12% 5% 12% 7% 6% 6% 4 5% 6% 28%	3734
	11th to 20th	Night	6% 10% 3 8% 6% 6% 6% 4 6% 9% 36%	3628
	21st to end	Night	6% 9% 4 12% 7% 6% 6% 5% 5% 7% 33%	3541
April	1st to 10th	Night	7% 9% 3 6% 6% 4 4 4 7% 8% 43%	1900
	11th to 20th	Night	13% 13% 3 8% 5% 4 4 4 6% 7% 32%	1853
	21st to end	Night	14% 8% 3 7% 5% 5% 6% 4 5% 9% 34%	1534
May	1st to 10th	Night	21% 10% 3 8% 5% 4 4 2 4 6% 33%	2540
	11th to 20th	Night	12% 6% 2 6% 4 5% 5% 5% 6% 8% 41%	2518
	21st to end	Night	14% 6% 2 6% 5% 4 4 4 6% 8% 39%	2620
June	1st to 10th	Night	12% 5% 2 5% 4 4 4 4 6% 8% 45%	1177
	11th to 20th	Night	16% 7% 2 6% 4 5% 5% 4 5% 7% 39%	1140
	21st to end	Night	10% 4 2 6% 3 5% 4 4 8% 8% 48%	1140
July	1st to 10th	Night	6% 3 2 5% 4 5% 5% 5% 7% 11% 49%	2019
	11th to 20th	Night	5% 3 2 4 4 4 4 4 5% 8% 59%	2300
	21st to end	Night	4 3 1 4 3 3 3 4 5% 7% 64%	2762
August	1st to 10th	Night	6% 3 2 5% 3 4 5% 4 6% 9% 54%	2528
	11th to 20th	Night	4 2 2 5% 3 4 5% 4 7% 9% 53%	2496
	21st to end	Night	7% 4 2 5% 3 4 4 4 6% 8% 54%	3382
September	1st to 10th	Night	9% 4 1 4 4 4 4 4 5% 8% 52%	1900
	11th to 20th	Night	11% 6% 2 5% 4 4 4 4 5% 6% 48%	1905
	21st to end	Night	12% 6% 2 4 4 4 4 3 6% 7% 49%	2127
October	1st to 10th	Night	12% 7% 3 6% 3 4 4 3 6% 8% 46%	3800
	11th to 20th	Night	6% 6% 2 5% 3 4 4 4 6% 10% 51%	3873
	21st to end	Night	9% 8% 3 7% 5% 4 4 4 5% 8% 43%	4467
November	1st to 10th	Night	15% 13% 4 9% 7% 4 4 3 5% 5% 31%	2673
	11th to 20th	Night	7% 14% 5% 12% 8% 6% 6% 4 5% 6% 28%	2800
	21st to end	Night	8% 13% 6% 11% 7% 5% 4 3 6% 7% 30%	2968
December	1st to 10th	Night	7% 12% 6% 15% 9% 6% 5% 5% 5% 5% 26%	2850
	11th to 20th	Night	9% 13% 5% 14% 7% 6% 5% 5% 6% 6% 24%	3671
	21st to end	Night	5% 8% 3 8% 5% 4 4 4 6% 6% 48%	5566

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	61% 7% 15% 13% 5%	2199
	11th to 20th	Day	60% 6% 15% 13% 5%	2388
	21st to end	Day	53% 4 16% 23% 5%	2794
February	1st to 10th	Day	62% 4 13% 16% 5%	1565
	11th to 20th	Day	56% 5% 12% 16% 10% 1	1674
	21st to end	Day	59% 5% 12% 17% 8%	1520
March	1st to 10th	Day	58% 5% 15% 16% 5%	3130
	11th to 20th	Day	49% 8% 20% 19% 5%	3345
	21st to end	Day	49% 5% 14% 21% 10% 1	4102
April	1st to 10th	Day	41% 6% 17% 25% 11% 1	2280
	11th to 20th	Day	55% 4 13% 20% 7% 2	2278
	21st to end	Day	49% 4 15% 23% 9% 1	2645
May	1st to 10th	Day	49% 3 13% 25% 9% 1	4430
	11th to 20th	Day	41% 6% 12% 24% 16%	4392
	21st to end	Day	45% 5% 14% 27% 8% 1	4953
June	1st to 10th	Day	42% 5% 13% 27% 10% 2	3000
	11th to 20th	Day	51% 5% 14% 19% 10% 1	3040
	21st to end	Day	36% 7% 18% 29% 10%	3040
July	1st to 10th	Day	29% 8% 27% 29% 7%	4860
	11th to 20th	Day	28% 6% 17% 37% 12% 1	4580
	21st to end	Day	20% 4 16% 41% 17% 2	4651
August	1st to 10th	Day	31% 5% 21% 28% 14% 1	4396
	11th to 20th	Day	29% 5% 17% 38% 9% 1	4385
	21st to end	Day	31% 4 15% 37% 12% 1	4279
September	1st to 10th	Day	34% 4 16% 29% 15% 2	2280
	11th to 20th	Day	40% 4 15% 28% 11% 2	2275
	21st to end	Day	34% 4 15% 33% 14% 2	2051
October	1st to 10th	Day	41% 3 17% 28% 10% 1	3170
	11th to 20th	Day	32% 4 15% 37% 10% 2	3024
	21st to end	Day	44% 3 19% 26% 7%	3091
November	1st to 10th	Day	57% 4 15% 16% 7%	1623
	11th to 20th	Day	58% 6% 15% 16% 6%	1600
	21st to end	Day	57% 8% 15% 17% 3	1427
December	1st to 10th	Day	62% 6% 12% 14% 6%	1330
	11th to 20th	Day	63% 5% 18% 10% 4	1518
	21st to end	Day	40% 4 13% 23% 13% 7%	2090
January	1st to 10th	Night	57% 5% 16% 18% 4	4730
	11th to 20th	Night	63% 4 16% 13% 3	4574
	21st to end	Night	49% 5% 19% 23% 4	4873
February	1st to 10th	Night	57% 5% 12% 19% 7%	2632
	11th to 20th	Night	52% 5% 14% 19% 9%	2403
	21st to end	Night	48% 5% 15% 23% 9%	1933
March	1st to 10th	Night	54% 5% 18% 18% 4	3734
	11th to 20th	Night	45% 5% 23% 20% 7%	3628
	21st to end	Night	50% 4 14% 21% 10%	3541
April	1st to 10th	Night	38% 4 15% 26% 17% 1	1900
	11th to 20th	Night	50% 5% 9% 22% 10% 3	1853
	21st to end	Night	47% 5% 10% 25% 12% 1	1534
May	1st to 10th	Night	53% 4 10% 22% 11% 1	2540
	11th to 20th	Night	38% 5% 13% 24% 18% 2	2518
	21st to end	Night	39% 7% 14% 29% 10% 1	2620
June	1st to 10th	Night	35% 4 14% 30% 14% 2	1177
	11th to 20th	Night	43% 5% 16% 21% 14% 1	1140
	21st to end	Night	32% 6% 18% 34% 10% 1	1140
July	1st to 10th	Night	27% 7% 29% 30% 7%	1986
	11th to 20th	Night	23% 5% 13% 43% 14% 1	2258
	21st to end	Night	19% 3 14% 42% 18% 4	2674
August	1st to 10th	Night	27% 6% 22% 30% 15% 1	2520
	11th to 20th	Night	24% 6% 19% 38% 12% 1	2520
	21st to end	Night	28% 4 15% 37% 14% 1	3382
September	1st to 10th	Night	31% 5% 11% 30% 21% 3	1900
	11th to 20th	Night	35% 5% 16% 27% 16% 1	1905
	21st to end	Night	34% 4 13% 31% 16% 2	2127
October	1st to 10th	Night	37% 3 17% 32% 9% 2	3800
	11th to 20th	Night	30% 3 15% 39% 12% 1	3873
	21st to end	Night	40% 4 13% 33% 9%	4467
November	1st to 10th	Night	55% 5% 13% 18% 7% 1	2673
	11th to 20th	Night	57% 4 18% 15% 5%	2800
	21st to end	Night	53% 6% 18% 20% 4	2968
December	1st to 10th	Night	59% 4 15% 16% 5%	2850
	11th to 20th	Night	60% 5% 15% 15% 4	3670
	21st to end	Night	36% 4 13% 26% 17% 5%	5566

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	13% 6% 27% 32% 18% 4	180
	11th to 20th	Day	11% 9% 24% 35% 18% 3	229
	21st to end	Day	18% 7% 28% 32% 15% 1	297
February	1st to 10th	Day	13% 7% 33% 34% 11% 1	270
	11th to 20th	Day	11% 6% 30% 33% 16% 4	270
	21st to end	Day	5% 6% 29% 36% 21% 3	225
March	1st to 10th	Day	15% 8% 32% 29% 12% 4	270
	11th to 20th	Day	13% 8% 35% 27% 13% 4	367
	21st to end	Day	15% 8% 29% 28% 17% 2	506
April	1st to 10th	Day	9% 13% 37% 28% 12% 2	460
	11th to 20th	Day	19% 12% 29% 27% 11% 3	476
	21st to end	Day	17% 7% 27% 31% 17% 1	650
May	1st to 10th	Day	15% 5% 25% 31% 21% 4	653
	11th to 20th	Day	13% 5% 26% 31% 20% 6%	675
	21st to end	Day	17% 8% 21% 28% 20% 7%	734
June	1st to 10th	Day	16% 10% 28% 24% 18% 5%	680
	11th to 20th	Day	20% 9% 30% 24% 14% 3	680
	21st to end	Day	11% 6% 25% 30% 23% 5%	680
July	1st to 10th	Day	9% 3 21% 33% 26% 8%	671
	11th to 20th	Day	8% 5% 24% 31% 23% 9%	668
	21st to end	Day	6% 5% 22% 34% 23% 10%	739
August	1st to 10th	Day	8% 5% 21% 35% 25% 7%	676
	11th to 20th	Day	9% 5% 18% 33% 27% 8%	665
	21st to end	Day	13% 6% 22% 32% 22% 7%	539
September	1st to 10th	Day	14% 9% 28% 30% 16% 4	490
	11th to 20th	Day	17% 7% 27% 28% 18% 2	485
	21st to end	Day	15% 10% 25% 32% 14% 3	300
October	1st to 10th	Day	20% 5% 29% 24% 19% 4	300
	11th to 20th	Day	14% 7% 35% 27% 16% 2	300
	21st to end	Day	15% 8% 36% 28% 11% 2	330
November	1st to 10th	Day	22% 6% 31% 26% 12% 3	300
	11th to 20th	Day	15% 10% 37% 29% 8% 1	300
	21st to end	Day	14% 8% 34% 32% 11% 2	299
December	1st to 10th	Day	13% 5% 30% 36% 13% 3	270
	11th to 20th	Day	12% 9% 47% 24% 7% 1	216
	21st to end	Day	13% 3 30% 39% 11% 4	198
January	1st to 10th	Night	9% 8% 34% 33% 14% 2	950
	11th to 20th	Night	14% 9% 32% 35% 10% 1	950
	21st to end	Night	12% 8% 36% 31% 12% 1	1045
February	1st to 10th	Night	12% 6% 29% 37% 14% 2	922
	11th to 20th	Night	10% 5% 32% 38% 12% 2	744
	21st to end	Night	5% 3 23% 42% 22% 4	628
March	1st to 10th	Night	13% 6% 31% 34% 15% 2	760
	11th to 20th	Night	11% 6% 33% 34% 13% 2	760
	21st to end	Night	13% 5% 29% 37% 14% 1	665
April	1st to 10th	Night	10% 8% 33% 36% 13% 1	570
	11th to 20th	Night	21% 7% 29% 33% 10% 1	563
	21st to end	Night	18% 8% 29% 38% 7% 1	570
May	1st to 10th	Night	16% 5% 27% 35% 17% 1	570
	11th to 20th	Night	15% 6% 27% 34% 17% 1	561
	21st to end	Night	20% 4 23% 32% 18% 2	617
June	1st to 10th	Night	16% 5% 27% 34% 18% 1	417
	11th to 20th	Night	19% 4 28% 33% 15%	380
	21st to end	Night	12% 3 24% 41% 19% 1	380
July	1st to 10th	Night	6% 3 19% 49% 21% 2	370
	11th to 20th	Night	7% 2 27% 42% 21% 1	409
	21st to end	Night	6% 4 22% 42% 24% 2	624
August	1st to 10th	Night	8% 2 23% 40% 24% 3	567
	11th to 20th	Night	7% 2 17% 43% 28% 2	564
	21st to end	Night	10% 3 25% 41% 21% 1	627
September	1st to 10th	Night	11% 4 24% 38% 21% 2	570
	11th to 20th	Night	14% 4 24% 42% 16% 1	570
	21st to end	Night	14% 5% 30% 38% 13%	607
October	1st to 10th	Night	20% 6% 21% 36% 16% 1	760
	11th to 20th	Night	14% 6% 27% 38% 14% 2	817
	21st to end	Night	18% 8% 30% 34% 9% 1	1045
November	1st to 10th	Night	21% 7% 29% 34% 8% 1	975
	11th to 20th	Night	16% 8% 32% 32% 10% 2	1000
	21st to end	Night	13% 9% 36% 34% 8% 1	1000
December	1st to 10th	Night	12% 6% 32% 33% 15% 2	950
	11th to 20th	Night	14% 8% 33% 33% 11% 1	950
	21st to end	Night	13% 4 29% 37% 14% 3	1045

Page generated at 2024-11-27 16:30:49. Version ac07

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