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 2026-07-01.

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 9% 6% 5% 5% 4 6% 8% 37%	142110
	Night	7% 9% 4 10% 6% 6% 6% 4 6% 8% 34%	139012
Transparency	Day	44% 6% 15% 24% 10% 1	141823
	Night	46% 6% 14% 23% 10% 1	138885
Seeing	Day	13% 9% 30% 29% 15% 4	18377
	Night	13% 8% 31% 35% 13% 1	27827

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	5% 12% 6% 16% 10% 8% 8% 5% 7% 7% 16%	4044
	11th to 20th	Day	3 8% 4 11% 11% 10% 8% 8% 11% 10% 16%	4716
	21st to end	Day	5% 11% 5% 11% 8% 6% 7% 3 5% 9% 31%	5188
February	1st to 10th	Day	7% 13% 5% 15% 8% 7% 7% 6% 7% 6% 19%	1680
	11th to 20th	Day	7% 10% 5% 12% 7% 7% 7% 6% 7% 7% 26%	1842
	21st to end	Day	5% 10% 4 12% 11% 8% 7% 5% 9% 9% 21%	1725
March	1st to 10th	Day	7% 11% 6% 16% 7% 5% 5% 3 6% 9% 26%	4600
	11th to 20th	Day	7% 13% 7% 18% 7% 6% 4 3 4 7% 26%	4765
	21st to end	Day	9% 12% 4 13% 6% 5% 5% 4 6% 6% 28%	6101
April	1st to 10th	Day	6% 9% 4 7% 6% 7% 6% 5% 8% 8% 36%	2520
	11th to 20th	Day	13% 14% 5% 9% 6% 5% 4 3 6% 7% 28%	2565
	21st to end	Day	12% 10% 3 8% 6% 5% 4 4 6% 7% 35%	2861
May	1st to 10th	Day	11% 7% 2 6% 4 4 4 4 6% 7% 45%	8224
	11th to 20th	Day	17% 8% 3 6% 4 4 5% 5% 7% 9% 33%	8191
	21st to end	Day	9% 6% 2 6% 4 5% 4 4 6% 8% 47%	9538
June	1st to 10th	Day	14% 6% 3 7% 6% 4 5% 5% 7% 8% 36%	3206
	11th to 20th	Day	17% 9% 3 7% 6% 6% 5% 6% 6% 8% 28%	3360
	21st to end	Day	13% 5% 2 6% 5% 5% 6% 4 7% 9% 38%	3360
July	1st to 10th	Day	5% 4 2 5% 5% 5% 6% 5% 8% 10% 46%	7241
	11th to 20th	Day	8% 5% 2 6% 4 5% 6% 5% 7% 10% 42%	6485
	21st to end	Day	6% 4 2 5% 4 4 4 4 6% 9% 54%	6898
August	1st to 10th	Day	8% 5% 2 7% 4 4 5% 4 6% 8% 46%	4552
	11th to 20th	Day	6% 4 2 6% 4 5% 5% 4 7% 10% 47%	4483
	21st to end	Day	11% 5% 2 6% 3 3 4 4 5% 7% 50%	4444
September	1st to 10th	Day	11% 5% 2 6% 5% 4 4 3 5% 7% 48%	2400
	11th to 20th	Day	12% 8% 2 7% 5% 4 4 3 6% 8% 40%	2354
	21st to end	Day	12% 7% 2 4 3 3 3 3 6% 6% 51%	2200
October	1st to 10th	Day	9% 8% 3 7% 3 4 5% 3 6% 8% 43%	3286
	11th to 20th	Day	7% 7% 3 5% 3 4 4 3 7% 10% 47%	3037
	21st to end	Day	8% 10% 4 10% 4 4 4 4 6% 7% 39%	3190
November	1st to 10th	Day	14% 15% 3 10% 7% 5% 5% 3 5% 5% 28%	1760
	11th to 20th	Day	7% 15% 5% 13% 9% 5% 5% 4 5% 6% 26%	1627
	21st to end	Day	9% 15% 5% 11% 7% 6% 5% 4 6% 6% 26%	1470
December	1st to 10th	Day	5% 12% 5% 15% 11% 8% 6% 4 6% 6% 22%	2360
	11th to 20th	Day	6% 16% 7% 16% 8% 6% 5% 5% 6% 6% 17%	2709
	21st to end	Day	4 9% 4 14% 7% 5% 7% 3 3 5% 39%	3128
January	1st to 10th	Night	4 13% 5% 16% 9% 8% 7% 5% 7% 8% 18%	8825
	11th to 20th	Night	4 9% 4 13% 10% 10% 9% 6% 9% 7% 19%	8212
	21st to end	Night	4 10% 4 12% 9% 6% 6% 5% 7% 8% 30%	9026
February	1st to 10th	Night	8% 11% 5% 12% 7% 7% 8% 6% 7% 7% 22%	2940
	11th to 20th	Night	4 10% 4 11% 7% 7% 8% 6% 7% 9% 27%	2683
	21st to end	Night	3 9% 4 12% 7% 8% 6% 5% 7% 9% 30%	2081
March	1st to 10th	Night	6% 11% 6% 13% 6% 6% 6% 5% 6% 9% 25%	5494
	11th to 20th	Night	6% 12% 5% 11% 8% 6% 5% 5% 5% 8% 28%	5436
	21st to end	Night	7% 13% 5% 12% 7% 5% 5% 4 8% 7% 25%	5094
April	1st to 10th	Night	6% 10% 3 6% 6% 4 5% 5% 6% 8% 42%	2100
	11th to 20th	Night	12% 12% 3 9% 5% 5% 5% 4 5% 7% 33%	2006
	21st to end	Night	13% 9% 3 6% 6% 6% 4 5% 6% 7% 35%	1756
May	1st to 10th	Night	10% 6% 2 7% 4 4 4 4 6% 7% 46%	4724
	11th to 20th	Night	16% 8% 3 8% 4 4 5% 4 7% 7% 34%	4702
	21st to end	Night	12% 5% 2 5% 3 4 4 3 6% 8% 48%	4664
June	1st to 10th	Night	11% 7% 2 6% 4 4 4 5% 6% 7% 45%	1409
	11th to 20th	Night	16% 7% 2 6% 5% 5% 4 4 6% 7% 37%	1260
	21st to end	Night	11% 4 3 5% 5% 4 5% 5% 5% 10% 44%	1260
July	1st to 10th	Night	6% 4 2 5% 4 5% 5% 4 8% 12% 45%	2720
	11th to 20th	Night	10% 5% 2 5% 4 4 4 4 6% 8% 49%	3455
	21st to end	Night	5% 3 2 4 3 3 3 3 5% 8% 62%	3968
August	1st to 10th	Night	7% 4 2 5% 3 4 4 3 6% 8% 54%	2608
	11th to 20th	Night	5% 3 2 5% 4 4 5% 4 7% 10% 51%	2576
	21st to end	Night	7% 4 2 5% 4 4 4 4 6% 8% 53%	3461
September	1st to 10th	Night	9% 4 2 5% 4 4 4 4 5% 6% 52%	2000
	11th to 20th	Night	11% 7% 2 6% 3 4 5% 4 6% 8% 44%	2045
	21st to end	Night	11% 5% 2 5% 3 4 4 4 6% 6% 51%	2200
October	1st to 10th	Night	10% 8% 2 5% 4 4 4 3 6% 7% 48%	3887
	11th to 20th	Night	6% 7% 2 5% 4 5% 5% 4 6% 10% 46%	4078
	21st to end	Night	8% 9% 3 7% 5% 3 4 4 6% 7% 43%	4610
November	1st to 10th	Night	14% 14% 5% 9% 6% 4 4 4 4 5% 30%	2754
	11th to 20th	Night	8% 14% 5% 12% 7% 6% 5% 4 5% 6% 28%	2993
	21st to end	Night	8% 12% 5% 13% 7% 6% 5% 4 6% 6% 27%	3150
December	1st to 10th	Night	6% 15% 7% 14% 10% 8% 8% 5% 6% 5% 16%	5050
	11th to 20th	Night	6% 14% 5% 13% 7% 8% 7% 6% 7% 7% 19%	5718
	21st to end	Night	4 7% 3 12% 11% 7% 7% 3 6% 7% 35%	8067

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	65% 6% 12% 8% 9%	4044
	11th to 20th	Day	56% 5% 13% 18% 7%	4740
	21st to end	Day	52% 4 17% 19% 8%	5188
February	1st to 10th	Day	61% 6% 13% 12% 7%	1680
	11th to 20th	Day	54% 7% 9% 18% 12%	1851
	21st to end	Day	55% 7% 13% 16% 9%	1725
March	1st to 10th	Day	56% 5% 17% 15% 7%	4600
	11th to 20th	Day	59% 5% 15% 15% 5%	4766
	21st to end	Day	53% 6% 11% 18% 11% 1	6101
April	1st to 10th	Day	43% 7% 17% 23% 10%	2520
	11th to 20th	Day	55% 7% 14% 16% 7% 2	2565
	21st to end	Day	46% 7% 15% 23% 8% 1	2861
May	1st to 10th	Day	37% 4 12% 28% 18% 1	8224
	11th to 20th	Day	45% 6% 14% 23% 11% 1	8195
	21st to end	Day	34% 6% 10% 28% 20% 1	9538
June	1st to 10th	Day	44% 8% 14% 24% 9% 1	3206
	11th to 20th	Day	51% 8% 14% 18% 8% 1	3360
	21st to end	Day	40% 10% 18% 24% 8%	3360
July	1st to 10th	Day	31% 10% 23% 28% 8%	7162
	11th to 20th	Day	35% 7% 17% 34% 6%	6406
	21st to end	Day	27% 7% 19% 34% 12% 1	6705
August	1st to 10th	Day	34% 8% 18% 28% 12% 1	4536
	11th to 20th	Day	30% 7% 20% 37% 5%	4525
	21st to end	Day	33% 6% 14% 37% 9% 1	4443
September	1st to 10th	Day	35% 6% 13% 32% 13% 1	2400
	11th to 20th	Day	42% 7% 15% 24% 11% 1	2354
	21st to end	Day	34% 5% 14% 33% 13% 2	2200
October	1st to 10th	Day	40% 4 17% 29% 8% 1	3286
	11th to 20th	Day	33% 4 16% 36% 9% 1	3037
	21st to end	Day	45% 5% 17% 26% 7%	3190
November	1st to 10th	Day	59% 6% 14% 15% 6% 1	1760
	11th to 20th	Day	59% 7% 13% 14% 6%	1627
	21st to end	Day	59% 7% 13% 17% 4	1470
December	1st to 10th	Day	63% 5% 16% 12% 4	2360
	11th to 20th	Day	65% 5% 17% 11% 2	2710
	21st to end	Day	49% 4 10% 22% 10% 5%	3128
January	1st to 10th	Night	61% 6% 10% 16% 6%	8826
	11th to 20th	Night	59% 6% 13% 16% 6%	8250
	21st to end	Night	50% 7% 18% 17% 8%	9026
February	1st to 10th	Night	57% 7% 12% 16% 8% 1	2940
	11th to 20th	Night	50% 7% 12% 19% 11% 1	2684
	21st to end	Night	48% 6% 13% 24% 8%	2081
March	1st to 10th	Night	53% 5% 22% 14% 5%	5494
	11th to 20th	Night	52% 7% 17% 18% 6%	5436
	21st to end	Night	54% 6% 10% 21% 9%	5094
April	1st to 10th	Night	38% 6% 15% 25% 16% 1	2100
	11th to 20th	Night	49% 6% 11% 20% 12% 2	2006
	21st to end	Night	46% 6% 12% 23% 12%	1756
May	1st to 10th	Night	36% 5% 11% 32% 16% 1	4724
	11th to 20th	Night	46% 7% 13% 22% 11% 1	4702
	21st to end	Night	33% 6% 10% 28% 22% 1	4668
June	1st to 10th	Night	36% 7% 13% 28% 14% 3	1409
	11th to 20th	Night	44% 6% 14% 23% 12% 1	1260
	21st to end	Night	36% 8% 20% 28% 8% 1	1260
July	1st to 10th	Night	30% 8% 25% 31% 6%	2690
	11th to 20th	Night	32% 7% 16% 37% 9% 1	3412
	21st to end	Night	21% 5% 24% 32% 15% 2	3856
August	1st to 10th	Night	27% 8% 20% 31% 14%	2600
	11th to 20th	Night	27% 7% 19% 38% 9% 1	2600
	21st to end	Night	28% 6% 17% 37% 11% 1	3461
September	1st to 10th	Night	31% 7% 12% 31% 17% 2	2000
	11th to 20th	Night	37% 7% 15% 27% 12% 1	2045
	21st to end	Night	32% 6% 14% 30% 15% 2	2200
October	1st to 10th	Night	36% 5% 15% 32% 9% 3	3887
	11th to 20th	Night	34% 4 15% 35% 12% 1	4078
	21st to end	Night	40% 5% 13% 32% 10%	4610
November	1st to 10th	Night	56% 5% 12% 17% 8% 1	2754
	11th to 20th	Night	57% 7% 15% 15% 6%	2993
	21st to end	Night	55% 7% 15% 18% 4	3150
December	1st to 10th	Night	67% 8% 11% 11% 3	5050
	11th to 20th	Night	62% 6% 15% 13% 4	5716
	21st to end	Night	48% 4 10% 21% 13% 4	8067

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	10% 11% 35% 29% 13% 3	251
	11th to 20th	Day	9% 10% 36% 34% 9% 2	330
	21st to end	Day	14% 10% 33% 28% 13% 2	363
February	1st to 10th	Day	12% 13% 34% 29% 11%	330
	11th to 20th	Day	9% 7% 32% 32% 15% 6%	330
	21st to end	Day	8% 8% 27% 40% 15% 3	273
March	1st to 10th	Day	13% 8% 35% 28% 13% 3	330
	11th to 20th	Day	11% 12% 34% 27% 13% 3	378
	21st to end	Day	15% 11% 35% 25% 12% 2	594
April	1st to 10th	Day	10% 14% 38% 29% 8% 1	540
	11th to 20th	Day	18% 17% 31% 25% 8% 2	603
	21st to end	Day	15% 9% 28% 32% 15% 1	750
May	1st to 10th	Day	12% 10% 31% 30% 15% 2	753
	11th to 20th	Day	15% 9% 29% 25% 15% 6%	775
	21st to end	Day	15% 7% 28% 27% 18% 5%	844
June	1st to 10th	Day	15% 14% 27% 25% 15% 4	780
	11th to 20th	Day	20% 11% 30% 26% 11% 3	780
	21st to end	Day	14% 8% 25% 31% 18% 4	780
July	1st to 10th	Day	8% 4 27% 32% 23% 6%	722
	11th to 20th	Day	9% 7% 27% 29% 22% 6%	718
	21st to end	Day	7% 6% 25% 34% 19% 9%	794
August	1st to 10th	Day	10% 6% 23% 33% 22% 6%	726
	11th to 20th	Day	9% 5% 23% 35% 22% 7%	715
	21st to end	Day	11% 8% 22% 33% 20% 5%	643
September	1st to 10th	Day	13% 11% 31% 25% 16% 5%	530
	11th to 20th	Day	19% 9% 28% 27% 15% 3	484
	21st to end	Day	13% 11% 31% 30% 13% 2	330
October	1st to 10th	Day	20% 11% 29% 20% 18% 2	330
	11th to 20th	Day	15% 12% 36% 22% 11% 3	330
	21st to end	Day	14% 13% 34% 28% 8% 2	363
November	1st to 10th	Day	21% 9% 31% 27% 8% 4	330
	11th to 20th	Day	15% 11% 39% 28% 7%	330
	21st to end	Day	13% 8% 37% 32% 9% 1	330
December	1st to 10th	Day	13% 9% 38% 26% 12% 2	330
	11th to 20th	Day	14% 11% 45% 24% 5% 2	330
	21st to end	Day	14% 5% 34% 30% 15% 2	258
January	1st to 10th	Night	10% 10% 34% 34% 11% 1	1050
	11th to 20th	Night	14% 13% 35% 31% 7%	1050
	21st to end	Night	12% 11% 37% 30% 9% 1	1155
February	1st to 10th	Night	13% 9% 32% 31% 13% 2	1050
	11th to 20th	Night	9% 5% 34% 37% 12% 2	845
	21st to end	Night	6% 6% 26% 40% 18% 3	692
March	1st to 10th	Night	13% 7% 31% 34% 12% 2	840
	11th to 20th	Night	10% 8% 33% 36% 13% 1	840
	21st to end	Night	13% 5% 30% 35% 14% 2	693
April	1st to 10th	Night	10% 9% 31% 37% 13% 1	630
	11th to 20th	Night	19% 7% 31% 32% 10%	623
	21st to end	Night	17% 8% 31% 34% 9% 1	630
May	1st to 10th	Night	12% 6% 31% 36% 14% 1	630
	11th to 20th	Night	17% 7% 29% 31% 15% 1	621
	21st to end	Night	18% 6% 26% 33% 16% 2	683
June	1st to 10th	Night	14% 7% 30% 34% 15% 1	569
	11th to 20th	Night	19% 7% 27% 35% 11%	420
	21st to end	Night	13% 6% 23% 41% 16% 1	420
July	1st to 10th	Night	9% 3 24% 40% 23% 2	390
	11th to 20th	Night	11% 3 28% 39% 19% 1	525
	21st to end	Night	7% 4 22% 42% 23% 3	657
August	1st to 10th	Night	8% 4 24% 40% 22% 2	597
	11th to 20th	Night	8% 3 19% 44% 25% 2	594
	21st to end	Night	9% 5% 24% 43% 19% 1	660
September	1st to 10th	Night	11% 6% 25% 35% 21% 2	600
	11th to 20th	Night	14% 6% 24% 41% 14% 1	600
	21st to end	Night	11% 6% 31% 38% 13% 1	600
October	1st to 10th	Night	19% 7% 23% 36% 15% 1	780
	11th to 20th	Night	15% 9% 30% 35% 11% 1	903
	21st to end	Night	15% 11% 32% 34% 7% 1	1100
November	1st to 10th	Night	20% 9% 32% 29% 8% 1	1025
	11th to 20th	Night	15% 11% 37% 28% 8% 2	1050
	21st to end	Night	13% 11% 37% 32% 6% 1	1050
December	1st to 10th	Night	11% 8% 36% 31% 11% 3	1050
	11th to 20th	Night	12% 11% 35% 31% 9% 1	1050
	21st to end	Night	12% 7% 32% 34% 14% 2	1155

Page generated at 2026-06-28 00:10:50. Version ac07

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