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 2025-02-25.

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% 36%	112204
	Night	7% 9% 4 9% 7% 6% 6% 4 6% 8% 35%	115112
Transparency	Day	44% 7% 15% 24% 9% 1	111959
	Night	46% 6% 15% 23% 9% 1	115004
Seeing	Day	13% 9% 30% 29% 15% 4	16429
	Night	13% 8% 31% 34% 13% 1	26102

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% 14% 7% 16% 9% 9% 8% 5% 6% 7% 14%	3110
	11th to 20th	Day	3 8% 3 12% 11% 9% 7% 8% 11% 11% 16%	3616
	21st to end	Day	5% 12% 6% 13% 8% 6% 5% 3 6% 7% 29%	4004
February	1st to 10th	Day	7% 13% 5% 14% 8% 7% 7% 6% 7% 6% 19%	1600
	11th to 20th	Day	6% 10% 5% 12% 7% 7% 7% 6% 7% 7% 26%	1752
	21st to end	Day	5% 10% 4 12% 11% 8% 7% 4 8% 9% 21%	1605
March	1st to 10th	Day	8% 12% 5% 14% 8% 6% 6% 4 6% 8% 23%	3130
	11th to 20th	Day	6% 10% 6% 16% 7% 6% 4 3 4 7% 31%	3251
	21st to end	Day	7% 9% 4 11% 7% 5% 5% 4 6% 8% 33%	4165
April	1st to 10th	Day	6% 8% 3 7% 6% 7% 6% 5% 8% 8% 35%	2280
	11th to 20th	Day	14% 15% 5% 9% 6% 5% 4 3 6% 7% 27%	2318
	21st to end	Day	12% 10% 2 7% 6% 5% 4 4 6% 8% 35%	2589
May	1st to 10th	Day	18% 10% 3 6% 4 3 4 4 5% 7% 37%	4430
	11th to 20th	Day	12% 8% 3 6% 5% 5% 5% 5% 7% 9% 36%	4388
	21st to end	Day	13% 7% 2 7% 5% 6% 5% 5% 7% 9% 35%	5098
June	1st to 10th	Day	14% 6% 3 7% 6% 4 5% 5% 7% 7% 36%	2900
	11th to 20th	Day	17% 9% 3 7% 6% 6% 5% 6% 6% 7% 29%	3040
	21st to end	Day	11% 5% 2 6% 5% 5% 6% 4 7% 9% 39%	3040
July	1st to 10th	Day	5% 4 2 5% 5% 5% 6% 5% 8% 11% 45%	5060
	11th to 20th	Day	6% 4 2 5% 3 4 5% 4 7% 10% 51%	4522
	21st to end	Day	4 3 1 4 4 4 4 4 5% 8% 57%	4802
August	1st to 10th	Day	8% 5% 2 6% 4 4 5% 4 6% 9% 47%	4412
	11th to 20th	Day	6% 3 2 6% 4 5% 5% 4 7% 10% 47%	4343
	21st to end	Day	11% 5% 2 6% 3 3 4 4 5% 7% 50%	4308
September	1st to 10th	Day	12% 5% 2 5% 5% 4 4 3 5% 7% 48%	2280
	11th to 20th	Day	12% 8% 2 7% 4 4 4 3 6% 8% 41%	2237
	21st to end	Day	12% 7% 2 4 3 3 4 3 6% 6% 50%	2090
October	1st to 10th	Day	9% 9% 3 7% 4 4 5% 3 6% 8% 43%	3185
	11th to 20th	Day	7% 7% 3 5% 3 4 4 3 7% 10% 47%	2943
	21st to end	Day	8% 10% 4 10% 4 4 4 4 6% 7% 39%	3091
November	1st to 10th	Day	15% 15% 3 10% 7% 5% 5% 3 4 5% 27%	1675
	11th to 20th	Day	6% 16% 5% 13% 10% 5% 5% 4 5% 6% 25%	1550
	21st to end	Day	9% 16% 6% 11% 7% 6% 5% 4 6% 6% 25%	1400
December	1st to 10th	Day	5% 12% 5% 15% 11% 8% 6% 4 6% 6% 22%	2290
	11th to 20th	Day	6% 16% 7% 16% 8% 7% 5% 5% 6% 6% 17%	2639
	21st to end	Day	4 9% 4 14% 7% 5% 7% 3 4 5% 39%	3061
January	1st to 10th	Night	3 13% 5% 15% 10% 8% 7% 5% 7% 8% 18%	6808
	11th to 20th	Night	5% 9% 4 12% 10% 11% 9% 7% 9% 7% 17%	6302
	21st to end	Night	5% 11% 5% 14% 9% 5% 5% 4 6% 7% 29%	6974
February	1st to 10th	Night	8% 11% 4 11% 8% 7% 8% 6% 7% 7% 23%	2800
	11th to 20th	Night	4 10% 4 11% 7% 7% 8% 6% 7% 9% 27%	2552
	21st to end	Night	4 9% 4 12% 7% 8% 6% 5% 7% 9% 30%	1943
March	1st to 10th	Night	7% 12% 6% 12% 7% 5% 5% 4 5% 8% 28%	3734
	11th to 20th	Night	5% 11% 4 9% 6% 5% 5% 5% 6% 9% 35%	3717
	21st to end	Night	6% 9% 4 11% 8% 6% 6% 4 8% 8% 32%	3477
April	1st to 10th	Night	6% 10% 2 6% 6% 4 5% 5% 6% 8% 43%	1900
	11th to 20th	Night	13% 12% 3 9% 4 5% 5% 5% 6% 7% 32%	1813
	21st to end	Night	13% 9% 3 6% 6% 6% 5% 5% 6% 7% 35%	1589
May	1st to 10th	Night	17% 10% 4 8% 5% 4 4 4 4 6% 34%	2540
	11th to 20th	Night	11% 7% 2 6% 4 5% 5% 4 7% 8% 40%	2518
	21st to end	Night	14% 5% 2 5% 4 5% 5% 4 7% 8% 40%	2486
June	1st to 10th	Night	11% 7% 2 6% 4 4 4 4 6% 7% 46%	1275
	11th to 20th	Night	17% 7% 2 6% 5% 5% 4 5% 6% 6% 37%	1140
	21st to end	Night	10% 4 3 4 5% 4 5% 5% 5% 10% 46%	1140
July	1st to 10th	Night	6% 4 2 5% 4 5% 5% 4 8% 13% 45%	1900
	11th to 20th	Night	5% 4 1 4 3 3 4 3 6% 8% 58%	2411
	21st to end	Night	3 2 1 3 2 2 3 3 5% 8% 66%	2762
August	1st to 10th	Night	7% 4 2 5% 3 4 4 3 6% 8% 54%	2528
	11th to 20th	Night	5% 3 2 5% 4 4 4 4 7% 10% 51%	2496
	21st to end	Night	7% 4 2 5% 4 4 4 4 6% 8% 53%	3355
September	1st to 10th	Night	9% 4 2 5% 4 4 4 4 5% 6% 52%	1900
	11th to 20th	Night	10% 6% 3 6% 3 4 5% 3 6% 8% 46%	1943
	21st to end	Night	11% 5% 2 5% 3 4 4 4 6% 6% 49%	2090
October	1st to 10th	Night	10% 8% 2 5% 4 4 4 3 6% 7% 47%	3768
	11th to 20th	Night	6% 6% 2 5% 4 5% 5% 4 6% 11% 47%	3953
	21st to end	Night	8% 9% 3 7% 5% 3 4 4 6% 7% 42%	4467
November	1st to 10th	Night	15% 14% 5% 9% 6% 4 4 4 4 5% 30%	2620
	11th to 20th	Night	8% 14% 5% 12% 8% 7% 5% 4 5% 6% 27%	2850
	21st to end	Night	8% 13% 5% 12% 7% 6% 5% 4 6% 6% 28%	3000
December	1st to 10th	Night	6% 15% 7% 14% 9% 8% 7% 5% 6% 5% 17%	4900
	11th to 20th	Night	6% 14% 5% 13% 7% 8% 7% 5% 7% 7% 19%	5568
	21st to end	Night	4 7% 3 11% 11% 6% 6% 3 6% 7% 36%	7893

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	67% 6% 12% 10% 6%	3110
	11th to 20th	Day	55% 6% 14% 16% 8%	3640
	21st to end	Day	55% 5% 16% 19% 4	4004
February	1st to 10th	Day	61% 7% 13% 12% 7%	1600
	11th to 20th	Day	53% 7% 9% 18% 12%	1761
	21st to end	Day	56% 7% 13% 15% 9%	1605
March	1st to 10th	Day	59% 5% 15% 17% 4	3130
	11th to 20th	Day	53% 7% 17% 17% 5%	3252
	21st to end	Day	47% 7% 12% 19% 13% 1	4165
April	1st to 10th	Day	42% 8% 17% 23% 10%	2280
	11th to 20th	Day	56% 7% 13% 16% 7% 2	2318
	21st to end	Day	45% 7% 16% 23% 8% 1	2589
May	1st to 10th	Day	46% 6% 15% 24% 9%	4430
	11th to 20th	Day	42% 8% 14% 21% 14% 1	4392
	21st to end	Day	42% 9% 13% 27% 8%	5098
June	1st to 10th	Day	44% 8% 14% 24% 9% 1	2900
	11th to 20th	Day	52% 8% 14% 17% 9% 1	3040
	21st to end	Day	38% 10% 18% 25% 8%	3040
July	1st to 10th	Day	30% 11% 23% 29% 6%	4981
	11th to 20th	Day	27% 7% 16% 40% 8%	4443
	21st to end	Day	24% 6% 16% 38% 14% 1	4651
August	1st to 10th	Day	33% 8% 18% 28% 13% 1	4396
	11th to 20th	Day	30% 7% 20% 38% 6%	4385
	21st to end	Day	34% 6% 14% 37% 9%	4307
September	1st to 10th	Day	35% 6% 13% 31% 13% 1	2280
	11th to 20th	Day	40% 7% 15% 25% 11% 1	2237
	21st to end	Day	35% 5% 14% 32% 12% 2	2090
October	1st to 10th	Day	40% 4 18% 29% 8% 1	3185
	11th to 20th	Day	32% 4 17% 37% 9% 1	2943
	21st to end	Day	45% 5% 18% 26% 7%	3091
November	1st to 10th	Day	59% 6% 15% 13% 7%	1675
	11th to 20th	Day	60% 7% 13% 14% 6%	1550
	21st to end	Day	59% 7% 13% 16% 4	1400
December	1st to 10th	Day	62% 6% 16% 12% 4	2290
	11th to 20th	Day	66% 5% 17% 10% 2	2640
	21st to end	Day	48% 4 10% 22% 10% 5%	3061
January	1st to 10th	Night	61% 7% 12% 17% 4	6808
	11th to 20th	Night	59% 6% 14% 15% 5%	6340
	21st to end	Night	53% 7% 19% 16% 4	6974
February	1st to 10th	Night	56% 7% 13% 16% 8% 1	2800
	11th to 20th	Night	50% 7% 12% 19% 12% 1	2553
	21st to end	Night	49% 6% 13% 23% 9%	1943
March	1st to 10th	Night	52% 6% 20% 18% 5%	3734
	11th to 20th	Night	44% 8% 20% 21% 7%	3717
	21st to end	Night	47% 6% 12% 22% 12%	3477
April	1st to 10th	Night	37% 6% 15% 25% 16% 1	1900
	11th to 20th	Night	49% 6% 11% 19% 12% 2	1813
	21st to end	Night	46% 7% 12% 22% 12% 1	1589
May	1st to 10th	Night	49% 6% 11% 22% 11% 1	2540
	11th to 20th	Night	38% 9% 13% 22% 16% 2	2518
	21st to end	Night	36% 8% 15% 29% 10% 1	2486
June	1st to 10th	Night	37% 7% 13% 27% 14% 3	1275
	11th to 20th	Night	45% 7% 15% 21% 12% 1	1140
	21st to end	Night	34% 8% 19% 29% 9% 1	1140
July	1st to 10th	Night	29% 9% 29% 26% 7%	1870
	11th to 20th	Night	24% 7% 13% 43% 12% 1	2368
	21st to end	Night	17% 4 21% 37% 17% 4	2674
August	1st to 10th	Night	27% 7% 20% 31% 14%	2520
	11th to 20th	Night	27% 7% 19% 38% 9% 1	2520
	21st to end	Night	28% 6% 18% 36% 11% 1	3355
September	1st to 10th	Night	32% 7% 12% 30% 18% 2	1900
	11th to 20th	Night	36% 7% 15% 28% 13% 1	1943
	21st to end	Night	34% 6% 14% 29% 15% 2	2090
October	1st to 10th	Night	37% 5% 15% 32% 9% 3	3768
	11th to 20th	Night	33% 4 15% 35% 12% 1	3953
	21st to end	Night	40% 5% 14% 31% 10%	4467
November	1st to 10th	Night	57% 5% 13% 17% 8% 1	2620
	11th to 20th	Night	57% 7% 15% 15% 5%	2850
	21st to end	Night	55% 7% 16% 18% 4	3000
December	1st to 10th	Night	67% 8% 11% 10% 3	4900
	11th to 20th	Night	62% 6% 15% 13% 4	5566
	21st to end	Night	48% 4 10% 21% 13% 4	7893

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% 28% 13% 3	228
	11th to 20th	Day	7% 9% 36% 35% 10% 2	300
	21st to end	Day	15% 10% 33% 29% 12% 1	330
February	1st to 10th	Day	13% 12% 34% 30% 11%	300
	11th to 20th	Day	8% 8% 32% 34% 14% 4	300
	21st to end	Day	8% 6% 26% 42% 15% 3	237
March	1st to 10th	Day	13% 8% 36% 27% 13% 3	270
	11th to 20th	Day	11% 12% 33% 27% 14% 3	313
	21st to end	Day	14% 10% 33% 26% 13% 3	506
April	1st to 10th	Day	9% 15% 39% 28% 8% 1	460
	11th to 20th	Day	19% 17% 28% 24% 9% 2	516
	21st to end	Day	15% 10% 28% 32% 14%	650
May	1st to 10th	Day	13% 9% 31% 30% 15% 2	653
	11th to 20th	Day	14% 8% 29% 26% 17% 6%	675
	21st to end	Day	16% 7% 27% 27% 18% 5%	734
June	1st to 10th	Day	14% 13% 28% 26% 15% 4	680
	11th to 20th	Day	20% 12% 31% 23% 11% 3	680
	21st to end	Day	12% 8% 25% 32% 19% 4	680
July	1st to 10th	Day	8% 4 27% 32% 24% 6%	671
	11th to 20th	Day	8% 7% 27% 29% 23% 6%	668
	21st to end	Day	6% 7% 26% 34% 18% 9%	739
August	1st to 10th	Day	9% 6% 23% 34% 22% 6%	676
	11th to 20th	Day	8% 5% 22% 36% 23% 7%	665
	21st to end	Day	12% 7% 23% 34% 18% 5%	596
September	1st to 10th	Day	13% 11% 32% 24% 15% 4	490
	11th to 20th	Day	19% 9% 29% 26% 14% 3	447
	21st to end	Day	14% 12% 32% 28% 12% 2	300
October	1st to 10th	Day	21% 11% 29% 18% 19% 2	300
	11th to 20th	Day	15% 12% 35% 23% 12% 3	300
	21st to end	Day	14% 13% 35% 27% 8% 2	330
November	1st to 10th	Day	21% 8% 31% 26% 9% 4	300
	11th to 20th	Day	16% 10% 39% 29% 7%	300
	21st to end	Day	14% 9% 37% 31% 9% 1	300
December	1st to 10th	Day	12% 9% 38% 26% 13% 2	300
	11th to 20th	Day	12% 10% 46% 24% 5% 2	300
	21st to end	Day	14% 4 31% 32% 17% 2	235
January	1st to 10th	Night	10% 10% 33% 34% 12% 1	1000
	11th to 20th	Night	14% 12% 35% 31% 8% 1	1000
	21st to end	Night	13% 11% 37% 31% 9% 1	1100
February	1st to 10th	Night	14% 8% 32% 31% 13% 2	1000
	11th to 20th	Night	9% 5% 35% 37% 11% 3	804
	21st to end	Night	6% 5% 25% 40% 20% 3	646
March	1st to 10th	Night	14% 6% 31% 34% 13% 2	760
	11th to 20th	Night	9% 8% 33% 34% 14% 1	760
	21st to end	Night	12% 6% 30% 35% 15% 2	627
April	1st to 10th	Night	10% 9% 32% 35% 13% 1	570
	11th to 20th	Night	20% 7% 31% 31% 10% 1	563
	21st to end	Night	18% 7% 32% 33% 9% 1	570
May	1st to 10th	Night	13% 6% 31% 35% 14% 1	570
	11th to 20th	Night	15% 6% 29% 33% 16% 1	561
	21st to end	Night	18% 6% 25% 32% 17% 2	617
June	1st to 10th	Night	14% 7% 29% 35% 14% 1	515
	11th to 20th	Night	19% 8% 29% 32% 12% 1	380
	21st to end	Night	12% 6% 23% 40% 17% 1	380
July	1st to 10th	Night	8% 3 24% 39% 24% 2	370
	11th to 20th	Night	9% 3 28% 39% 19% 1	498
	21st to end	Night	7% 4 23% 41% 23% 3	624
August	1st to 10th	Night	8% 4 25% 40% 22% 2	567
	11th to 20th	Night	8% 3 17% 44% 26% 2	564
	21st to end	Night	10% 4 25% 43% 18% 1	627
September	1st to 10th	Night	11% 6% 25% 35% 20% 2	570
	11th to 20th	Night	14% 6% 25% 41% 14% 1	570
	21st to end	Night	12% 6% 31% 38% 13% 1	570
October	1st to 10th	Night	20% 7% 23% 34% 15% 1	741
	11th to 20th	Night	14% 8% 30% 36% 11% 1	858
	21st to end	Night	15% 11% 32% 33% 8% 1	1045
November	1st to 10th	Night	21% 9% 32% 30% 8% 1	975
	11th to 20th	Night	15% 10% 37% 28% 8% 2	1000
	21st to end	Night	13% 12% 38% 32% 5% 1	1000
December	1st to 10th	Night	11% 8% 37% 30% 11% 3	1000
	11th to 20th	Night	12% 11% 36% 31% 9% 1	1000
	21st to end	Night	12% 6% 32% 35% 14% 2	1100

Page generated at 2025-02-22 05:51:35. Version ac07

Copyright © 2025 Attilla Danko.