Fort Qu'Appelle
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Qu'Appelle clear sky chart from 2005-11-06 to 2024-02-05.

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% 4 8% 7% 4 5% 5% 6% 8% 35%	77925
	Night	8% 9% 4 8% 7% 4 6% 5% 6% 7% 35%	80877
Transparency	Day	46% 7% 15% 22% 9% 1	77638
	Night	47% 7% 14% 22% 10% 1	80745
Seeing	Day	13% 9% 30% 29% 15% 4	14975
	Night	13% 7% 31% 34% 13% 1	24663

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	6% 14% 7% 14% 10% 7% 6% 6% 7% 7% 17%	2164
	11th to 20th	Day	5% 8% 4 12% 13% 8% 9% 10% 9% 8% 15%	2516
	21st to end	Day	6% 11% 7% 10% 9% 5% 6% 4 5% 7% 30%	2794
February	1st to 10th	Day	7% 12% 5% 13% 9% 5% 8% 8% 7% 6% 21%	1472
	11th to 20th	Day	7% 10% 5% 11% 9% 6% 8% 8% 6% 6% 24%	1572
	21st to end	Day	6% 9% 5% 11% 11% 7% 8% 6% 9% 9% 20%	1476
March	1st to 10th	Day	9% 12% 7% 13% 10% 5% 6% 5% 5% 7% 19%	1800
	11th to 20th	Day	7% 11% 6% 10% 7% 4 5% 5% 5% 9% 31%	1839
	21st to end	Day	10% 11% 5% 9% 7% 4 6% 6% 6% 8% 29%	2376
April	1st to 10th	Day	7% 8% 4 6% 7% 5% 7% 7% 8% 8% 35%	2160
	11th to 20th	Day	14% 14% 5% 8% 7% 4 4 4 6% 7% 27%	2194
	21st to end	Day	12% 9% 3 7% 6% 4 5% 5% 6% 8% 35%	2452
May	1st to 10th	Day	11% 7% 2 6% 6% 3 5% 6% 6% 9% 40%	2520
	11th to 20th	Day	9% 7% 3 5% 6% 3 5% 6% 7% 9% 40%	2478
	21st to end	Day	18% 7% 3 6% 6% 4 5% 5% 6% 8% 32%	2871
June	1st to 10th	Day	15% 5% 3 6% 7% 3 5% 6% 6% 8% 37%	2747
	11th to 20th	Day	18% 8% 3 6% 7% 4 6% 6% 5% 7% 29%	2880
	21st to end	Day	11% 4 2 5% 5% 4 7% 6% 7% 9% 39%	2880
July	1st to 10th	Day	6% 4 2 4 5% 3 4 5% 6% 9% 50%	2880
	11th to 20th	Day	8% 4 2 5% 4 3 6% 5% 7% 9% 46%	2586
	21st to end	Day	6% 3 2 4 4 3 5% 6% 6% 8% 53%	2742
August	1st to 10th	Day	7% 4 2 5% 5% 3 5% 5% 7% 9% 48%	2507
	11th to 20th	Day	9% 4 2 5% 4 4 5% 5% 7% 9% 47%	2477
	21st to end	Day	11% 5% 2 5% 5% 2 4 5% 5% 7% 49%	2449
September	1st to 10th	Day	12% 5% 2 5% 6% 3 4 4 5% 7% 47%	2160
	11th to 20th	Day	12% 7% 3 6% 5% 3 4 4 6% 8% 42%	2120
	21st to end	Day	13% 7% 3 3 4 2 4 4 6% 6% 49%	1980
October	1st to 10th	Day	15% 11% 5% 6% 4 2 4 4 5% 7% 37%	1815
	11th to 20th	Day	11% 9% 4 7% 5% 4 4 3 6% 6% 40%	1689
	21st to end	Day	11% 11% 6% 11% 6% 4 4 5% 4 7% 32%	1782
November	1st to 10th	Day	16% 13% 4 9% 8% 5% 5% 4 4 5% 26%	1590
	11th to 20th	Day	6% 14% 5% 12% 11% 5% 5% 5% 5% 6% 26%	1473
	21st to end	Day	10% 15% 6% 9% 8% 5% 5% 5% 6% 6% 26%	1330
December	1st to 10th	Day	7% 13% 6% 11% 12% 6% 7% 7% 6% 6% 20%	1330
	11th to 20th	Day	7% 14% 9% 16% 10% 4 6% 6% 5% 6% 16%	1679
	21st to end	Day	5% 8% 3 7% 5% 3 6% 4 4 6% 48%	2145
January	1st to 10th	Night	4 14% 6% 12% 10% 5% 6% 6% 7% 8% 23%	4764
	11th to 20th	Night	5% 7% 5% 12% 15% 10% 10% 7% 6% 7% 18%	4392
	21st to end	Night	6% 11% 4 10% 9% 4 5% 6% 7% 6% 31%	4873
February	1st to 10th	Night	8% 10% 5% 9% 8% 5% 9% 7% 7% 8% 24%	2583
	11th to 20th	Night	4 10% 5% 11% 7% 6% 8% 8% 6% 8% 26%	2290
	21st to end	Night	4 7% 6% 11% 8% 5% 8% 6% 6% 9% 30%	1780
March	1st to 10th	Night	8% 10% 5% 11% 9% 4 6% 5% 5% 8% 29%	2160
	11th to 20th	Night	6% 10% 4 9% 8% 4 6% 6% 5% 8% 34%	2116
	21st to end	Night	8% 11% 5% 9% 8% 4 6% 6% 7% 8% 30%	1980
April	1st to 10th	Night	7% 9% 3 5% 6% 3 5% 5% 6% 8% 43%	1800
	11th to 20th	Night	13% 11% 3 8% 6% 3 5% 5% 6% 7% 32%	1717
	21st to end	Night	14% 9% 3 5% 6% 5% 5% 6% 6% 7% 34%	1506
May	1st to 10th	Night	11% 6% 4 6% 5% 3 4 6% 6% 7% 41%	1440
	11th to 20th	Night	13% 5% 2 5% 4 3 4 5% 7% 9% 44%	1418
	21st to end	Night	17% 5% 2 5% 4 3 4 5% 7% 9% 37%	1402
June	1st to 10th	Night	11% 6% 3 4 4 3 3 5% 5% 8% 46%	1208
	11th to 20th	Night	17% 6% 3 5% 5% 4 4 6% 6% 6% 37%	1080
	21st to end	Night	10% 3 3 4 4 3 6% 6% 4 10% 45%	1080
July	1st to 10th	Night	6% 3 2 4 5% 3 6% 4 6% 10% 51%	1080
	11th to 20th	Night	7% 4 1 3 3 2 5% 4 6% 8% 57%	1367
	21st to end	Night	6% 3 1 3 3 2 4 3 5% 9% 62%	1576
August	1st to 10th	Night	7% 3 1 3 3 2 4 5% 6% 9% 57%	1432
	11th to 20th	Night	6% 3 2 4 4 3 5% 4 6% 9% 54%	1424
	21st to end	Night	9% 3 2 4 4 2 3 4 6% 8% 55%	1903
September	1st to 10th	Night	9% 5% 2 5% 5% 3 4 5% 5% 7% 50%	1800
	11th to 20th	Night	11% 6% 3 6% 4 3 5% 5% 6% 8% 46%	1840
	21st to end	Night	11% 5% 3 5% 4 2 4 5% 6% 6% 49%	1980
October	1st to 10th	Night	13% 10% 3 5% 5% 3 4 4 6% 7% 40%	2142
	11th to 20th	Night	9% 9% 4 5% 5% 3 4 5% 5% 7% 44%	2252
	21st to end	Night	11% 13% 5% 8% 7% 3 4 5% 5% 6% 33%	2574
November	1st to 10th	Night	15% 13% 5% 9% 7% 3 5% 4 4 5% 29%	2485
	11th to 20th	Night	8% 13% 6% 11% 9% 5% 7% 4 5% 6% 27%	2707
	21st to end	Night	8% 11% 6% 11% 8% 4 5% 5% 5% 6% 30%	2850
December	1st to 10th	Night	6% 11% 7% 11% 10% 6% 6% 7% 6% 5% 25%	2850
	11th to 20th	Night	8% 13% 7% 14% 10% 5% 6% 5% 6% 7% 21%	3518
	21st to end	Night	5% 7% 3 7% 7% 4 5% 5% 6% 8% 43%	5508

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% 8% 14% 10% 5%	2164
	11th to 20th	Day	62% 7% 14% 13% 4	2540
	21st to end	Day	55% 5% 11% 24% 6%	2794
February	1st to 10th	Day	60% 7% 14% 12% 6%	1472
	11th to 20th	Day	57% 8% 9% 16% 10%	1581
	21st to end	Day	56% 7% 13% 15% 9%	1476
March	1st to 10th	Day	64% 7% 12% 13% 5%	1800
	11th to 20th	Day	51% 7% 15% 19% 8%	1840
	21st to end	Day	52% 9% 15% 18% 6%	2376
April	1st to 10th	Day	44% 8% 16% 22% 10%	2160
	11th to 20th	Day	56% 7% 13% 15% 7% 2	2194
	21st to end	Day	46% 7% 16% 22% 8% 1	2452
May	1st to 10th	Day	40% 6% 13% 26% 13% 1	2520
	11th to 20th	Day	38% 8% 13% 27% 12% 1	2482
	21st to end	Day	50% 7% 12% 19% 11% 1	2871
June	1st to 10th	Day	44% 8% 15% 24% 8% 1	2747
	11th to 20th	Day	52% 8% 15% 17% 8%	2880
	21st to end	Day	38% 10% 18% 24% 8%	2880
July	1st to 10th	Day	29% 9% 19% 33% 9%	2801
	11th to 20th	Day	32% 10% 19% 28% 11% 1	2507
	21st to end	Day	29% 9% 16% 35% 11% 1	2590
August	1st to 10th	Day	30% 9% 22% 27% 11% 1	2491
	11th to 20th	Day	32% 8% 21% 31% 7% 1	2477
	21st to end	Day	34% 7% 12% 34% 13% 1	2449
September	1st to 10th	Day	36% 7% 13% 30% 13% 1	2160
	11th to 20th	Day	40% 7% 15% 25% 12% 1	2120
	21st to end	Day	35% 5% 15% 32% 11% 1	1980
October	1st to 10th	Day	48% 5% 14% 24% 7% 1	1815
	11th to 20th	Day	44% 5% 12% 29% 9% 1	1689
	21st to end	Day	53% 6% 16% 19% 6%	1782
November	1st to 10th	Day	61% 6% 13% 13% 6% 1	1590
	11th to 20th	Day	59% 7% 13% 14% 6%	1473
	21st to end	Day	59% 7% 13% 16% 4	1330
December	1st to 10th	Day	63% 5% 12% 13% 7%	1330
	11th to 20th	Day	67% 6% 15% 10% 3	1680
	21st to end	Day	37% 5% 12% 25% 13% 7%	2145
January	1st to 10th	Night	57% 7% 15% 15% 5%	4764
	11th to 20th	Night	64% 6% 13% 13% 4	4430
	21st to end	Night	51% 7% 16% 20% 5%	4873
February	1st to 10th	Night	54% 7% 13% 17% 7% 1	2583
	11th to 20th	Night	52% 7% 12% 17% 10% 1	2291
	21st to end	Night	49% 6% 12% 24% 9%	1780
March	1st to 10th	Night	53% 7% 15% 18% 6%	2160
	11th to 20th	Night	47% 7% 14% 24% 7% 1	2116
	21st to end	Night	49% 8% 14% 18% 10%	1980
April	1st to 10th	Night	38% 6% 14% 25% 17% 1	1800
	11th to 20th	Night	49% 6% 12% 19% 12% 2	1717
	21st to end	Night	48% 7% 12% 20% 12% 1	1506
May	1st to 10th	Night	39% 7% 11% 25% 17% 1	1440
	11th to 20th	Night	36% 7% 13% 26% 17% 2	1418
	21st to end	Night	41% 7% 18% 18% 14% 2	1402
June	1st to 10th	Night	37% 7% 14% 27% 13% 2	1208
	11th to 20th	Night	45% 7% 14% 20% 12% 1	1080
	21st to end	Night	34% 9% 20% 29% 8% 1	1080
July	1st to 10th	Night	28% 8% 20% 31% 12%	1050
	11th to 20th	Night	26% 8% 17% 35% 12% 1	1324
	21st to end	Night	20% 6% 19% 37% 16% 2	1488
August	1st to 10th	Night	23% 8% 20% 35% 13% 1	1424
	11th to 20th	Night	26% 7% 19% 35% 11% 1	1424
	21st to end	Night	27% 6% 14% 37% 16% 1	1903
September	1st to 10th	Night	33% 7% 12% 29% 17% 2	1800
	11th to 20th	Night	36% 8% 15% 27% 13% 1	1840
	21st to end	Night	34% 6% 15% 29% 15% 1	1980
October	1st to 10th	Night	43% 6% 18% 23% 9% 1	2142
	11th to 20th	Night	39% 5% 15% 27% 12% 1	2252
	21st to end	Night	51% 6% 13% 23% 7%	2574
November	1st to 10th	Night	57% 5% 12% 16% 8% 1	2485
	11th to 20th	Night	57% 8% 15% 15% 5%	2707
	21st to end	Night	54% 7% 17% 18% 4	2850
December	1st to 10th	Night	58% 6% 13% 16% 5% 1	2850
	11th to 20th	Night	63% 6% 12% 13% 5% 1	3516
	21st to end	Night	38% 5% 12% 22% 17% 6%	5508

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	11% 10% 34% 29% 13% 3	205
	11th to 20th	Day	8% 8% 35% 36% 11% 2	270
	21st to end	Day	16% 9% 30% 31% 13% 1	297
February	1st to 10th	Day	13% 10% 33% 32% 12%	252
	11th to 20th	Day	9% 7% 36% 34% 12% 3	240
	21st to end	Day	9% 5% 25% 42% 16% 4	198
March	1st to 10th	Day	13% 6% 38% 29% 13% 2	240
	11th to 20th	Day	11% 10% 33% 28% 14% 4	280
	21st to end	Day	15% 11% 33% 27% 13% 2	462
April	1st to 10th	Day	10% 15% 39% 28% 8%	420
	11th to 20th	Day	20% 16% 27% 25% 10% 2	472
	21st to end	Day	16% 10% 27% 33% 15%	600
May	1st to 10th	Day	11% 9% 31% 30% 15% 2	603
	11th to 20th	Day	14% 8% 28% 26% 18% 6%	625
	21st to end	Day	16% 7% 26% 27% 18% 6%	679
June	1st to 10th	Day	14% 11% 28% 27% 16% 4	630
	11th to 20th	Day	20% 11% 31% 24% 11% 3	630
	21st to end	Day	11% 8% 25% 32% 20% 5%	630
July	1st to 10th	Day	8% 4 29% 33% 23% 4	621
	11th to 20th	Day	9% 7% 29% 30% 21% 4	618
	21st to end	Day	6% 7% 27% 34% 18% 8%	684
August	1st to 10th	Day	9% 6% 22% 34% 23% 6%	626
	11th to 20th	Day	9% 5% 22% 35% 23% 7%	615
	21st to end	Day	13% 6% 23% 34% 19% 5%	549
September	1st to 10th	Day	14% 11% 34% 24% 14% 3	450
	11th to 20th	Day	19% 9% 29% 26% 15% 3	410
	21st to end	Day	14% 10% 32% 29% 13% 2	270
October	1st to 10th	Day	22% 9% 29% 18% 20% 2	270
	11th to 20th	Day	16% 12% 33% 24% 11% 4	270
	21st to end	Day	15% 13% 35% 27% 8% 2	297
November	1st to 10th	Day	22% 9% 30% 26% 9% 4	270
	11th to 20th	Day	14% 10% 40% 28% 8%	270
	21st to end	Day	15% 9% 36% 31% 8% 1	270
December	1st to 10th	Day	13% 7% 37% 27% 14% 2	270
	11th to 20th	Day	13% 10% 48% 22% 5% 2	270
	21st to end	Day	15% 4 33% 30% 16% 2	212
January	1st to 10th	Night	10% 10% 34% 34% 11% 1	950
	11th to 20th	Night	14% 12% 34% 32% 8% 1	950
	21st to end	Night	13% 10% 35% 32% 9% 1	1045
February	1st to 10th	Night	13% 8% 33% 32% 13% 2	923
	11th to 20th	Night	10% 6% 35% 37% 10% 2	722
	21st to end	Night	6% 5% 24% 40% 21% 4	592
March	1st to 10th	Night	13% 6% 32% 34% 13% 2	720
	11th to 20th	Night	10% 8% 32% 35% 15% 1	720
	21st to end	Night	12% 6% 30% 34% 16% 2	594
April	1st to 10th	Night	10% 9% 32% 36% 13% 1	540
	11th to 20th	Night	20% 6% 31% 32% 11% 1	533
	21st to end	Night	19% 7% 32% 33% 8% 1	540
May	1st to 10th	Night	12% 5% 32% 36% 14% 1	540
	11th to 20th	Night	15% 6% 28% 33% 16% 1	531
	21st to end	Night	19% 6% 26% 31% 17% 2	584
June	1st to 10th	Night	14% 6% 30% 34% 15% 1	488
	11th to 20th	Night	19% 8% 30% 31% 12% 1	360
	21st to end	Night	13% 5% 24% 39% 18% 1	360
July	1st to 10th	Night	8% 3 24% 41% 23% 1	350
	11th to 20th	Night	10% 3 30% 39% 18% 1	471
	21st to end	Night	7% 3 23% 41% 23% 3	591
August	1st to 10th	Night	8% 3 24% 40% 22% 2	537
	11th to 20th	Night	9% 3 17% 45% 25% 2	534
	21st to end	Night	10% 5% 23% 43% 18% 1	594
September	1st to 10th	Night	12% 6% 25% 35% 19% 2	540
	11th to 20th	Night	14% 6% 24% 41% 14% 1	540
	21st to end	Night	12% 6% 31% 37% 13% 1	540
October	1st to 10th	Night	20% 7% 23% 34% 15% 1	702
	11th to 20th	Night	15% 8% 29% 36% 12% 1	812
	21st to end	Night	16% 11% 31% 33% 7% 1	990
November	1st to 10th	Night	21% 9% 32% 29% 8% 1	925
	11th to 20th	Night	15% 11% 36% 29% 8% 2	950
	21st to end	Night	13% 11% 37% 32% 5% 1	950
December	1st to 10th	Night	11% 8% 37% 30% 11% 3	950
	11th to 20th	Night	12% 11% 36% 30% 9% 1	950
	21st to end	Night	12% 6% 32% 34% 13% 2	1045

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