Moose Jaw
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moose Jaw clear sky chart from 2005-11-06 to 2024-11-04.

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	8% 8% 3 8% 5% 5% 5% 4 6% 8% 40%	105320
	Night	7% 8% 3 9% 5% 5% 5% 4 6% 8% 40%	102292
Transparency	Day	40% 8% 16% 25% 10% 1	105076
	Night	41% 7% 16% 25% 10% 1	102182
Seeing	Day	12% 10% 30% 29% 16% 4	15927
	Night	12% 8% 32% 34% 13% 1	25332

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% 10% 7% 7% 8% 5% 7% 5% 27%	2219
	11th to 20th	Day	4 7% 4 11% 9% 9% 10% 8% 7% 7% 23%	2335
	21st to end	Day	5% 11% 5% 10% 6% 5% 5% 5% 6% 7% 36%	2794
February	1st to 10th	Day	8% 14% 5% 13% 9% 7% 6% 4 4 5% 25%	1603
	11th to 20th	Day	7% 13% 5% 11% 7% 6% 6% 5% 7% 6% 26%	1665
	21st to end	Day	4 13% 5% 11% 10% 6% 7% 6% 6% 8% 24%	1503
March	1st to 10th	Day	7% 13% 6% 12% 8% 6% 5% 4 5% 6% 29%	3130
	11th to 20th	Day	5% 11% 5% 10% 5% 4 4 3 6% 8% 39%	3387
	21st to end	Day	6% 12% 6% 13% 7% 6% 5% 4 6% 7% 28%	4067
April	1st to 10th	Day	6% 10% 3 7% 5% 7% 6% 4 6% 9% 37%	2280
	11th to 20th	Day	13% 13% 5% 9% 6% 5% 4 4 6% 7% 29%	2258
	21st to end	Day	14% 10% 4 8% 5% 5% 4 3 4 6% 36%	2650
May	1st to 10th	Day	17% 12% 3 6% 4 5% 4 3 5% 7% 34%	4430
	11th to 20th	Day	8% 6% 3 7% 6% 6% 7% 6% 7% 9% 36%	4388
	21st to end	Day	13% 7% 3 8% 6% 6% 5% 4 7% 8% 33%	4825
June	1st to 10th	Day	16% 7% 2 6% 5% 4 4 4 6% 8% 37%	2986
	11th to 20th	Day	17% 8% 3 6% 5% 5% 4 5% 6% 7% 33%	3040
	21st to end	Day	8% 5% 2 5% 5% 5% 5% 4 7% 9% 44%	3040
July	1st to 10th	Day	4 4 2 6% 5% 5% 7% 5% 8% 10% 45%	4750
	11th to 20th	Day	5% 3 2 4 3 4 5% 5% 7% 10% 52%	4688
	21st to end	Day	3 3 1 3 3 3 3 3 5% 9% 63%	4802
August	1st to 10th	Day	7% 4 2 5% 4 4 5% 4 7% 8% 50%	4412
	11th to 20th	Day	6% 4 2 5% 3 3 5% 4 7% 10% 52%	4261
	21st to end	Day	9% 4 2 5% 3 3 4 3 4 7% 56%	4307
September	1st to 10th	Day	11% 4 2 5% 4 3 4 4 5% 8% 49%	2280
	11th to 20th	Day	13% 6% 2 7% 4 3 4 3 5% 8% 44%	2280
	21st to end	Day	12% 5% 2 5% 3 4 4 4 5% 8% 50%	2037
October	1st to 10th	Day	8% 6% 2 6% 4 5% 5% 4 5% 7% 46%	3170
	11th to 20th	Day	6% 6% 3 6% 3 3 3 4 7% 11% 49%	3066
	21st to end	Day	6% 9% 3 8% 5% 5% 5% 4 6% 8% 41%	3091
November	1st to 10th	Day	12% 15% 4 8% 6% 6% 5% 3 4 7% 32%	1552
	11th to 20th	Day	8% 9% 4 13% 8% 6% 5% 4 5% 6% 32%	1520
	21st to end	Day	9% 12% 4 11% 7% 5% 6% 4 6% 6% 31%	1444
December	1st to 10th	Day	7% 14% 4 11% 10% 7% 6% 5% 6% 5% 25%	1330
	11th to 20th	Day	6% 14% 5% 13% 6% 6% 5% 4 7% 7% 25%	1506
	21st to end	Day	6% 8% 3 8% 6% 4 5% 3 5% 5% 47%	2224
January	1st to 10th	Night	3 12% 5% 14% 8% 6% 6% 4 6% 6% 29%	4726
	11th to 20th	Night	3 8% 4 15% 11% 10% 9% 5% 6% 6% 24%	4564
	21st to end	Night	5% 12% 4 10% 6% 5% 5% 4 6% 7% 36%	4873
February	1st to 10th	Night	6% 13% 5% 11% 7% 6% 7% 5% 6% 8% 26%	2594
	11th to 20th	Night	7% 12% 4 11% 7% 6% 6% 5% 6% 7% 30%	2402
	21st to end	Night	3 9% 4 11% 8% 7% 7% 4 8% 7% 32%	1951
March	1st to 10th	Night	6% 11% 5% 13% 9% 5% 5% 4 7% 7% 28%	3734
	11th to 20th	Night	5% 10% 4 9% 5% 5% 5% 4 5% 9% 39%	3587
	21st to end	Night	7% 10% 5% 13% 7% 5% 5% 4 5% 8% 29%	3578
April	1st to 10th	Night	7% 9% 3 6% 5% 5% 5% 4 5% 9% 43%	1900
	11th to 20th	Night	10% 15% 4 8% 4 4 4 4 6% 7% 32%	1872
	21st to end	Night	12% 8% 3 9% 6% 5% 5% 4 5% 8% 35%	1529
May	1st to 10th	Night	23% 11% 3 5% 3 3 4 3 5% 6% 33%	2540
	11th to 20th	Night	11% 6% 3 7% 4 4 5% 4 7% 9% 41%	2518
	21st to end	Night	15% 7% 2 6% 4 4 5% 4 6% 7% 38%	2762
June	1st to 10th	Night	11% 6% 1 4 4 5% 5% 4 7% 9% 43%	1190
	11th to 20th	Night	13% 5% 2 6% 4 4 4 4 6% 9% 41%	1140
	21st to end	Night	7% 4 1 5% 4 4 4 4 6% 9% 51%	1140
July	1st to 10th	Night	6% 4 2 4 4 4 4 5% 6% 10% 50%	2206
	11th to 20th	Night	4 2 1 4 3 3 4 4 6% 10% 59%	2274
	21st to end	Night	2 3 1 4 3 2 3 3 5% 7% 66%	2762
August	1st to 10th	Night	7% 4 2 4 3 3 4 4 5% 8% 56%	2528
	11th to 20th	Night	3 3 2 5% 3 4 6% 5% 8% 11% 53%	2574
	21st to end	Night	7% 3 2 4 3 4 4 4 5% 8% 55%	3359
September	1st to 10th	Night	9% 4 2 5% 3 4 4 4 5% 8% 54%	1900
	11th to 20th	Night	10% 5% 2 6% 4 4 4 3 5% 8% 48%	1900
	21st to end	Night	10% 5% 3 4 3 4 4 4 5% 7% 51%	2142
October	1st to 10th	Night	11% 6% 2 5% 4 3 3 3 5% 7% 51%	3800
	11th to 20th	Night	4 5% 2 5% 4 3 4 4 6% 9% 54%	3831
	21st to end	Night	7% 8% 3 7% 5% 4 5% 3 6% 8% 45%	4467
November	1st to 10th	Night	13% 13% 4 9% 5% 4 4 3 5% 6% 33%	2596
	11th to 20th	Night	7% 11% 4 13% 7% 5% 6% 3 7% 6% 31%	2660
	21st to end	Night	7% 13% 5% 10% 6% 5% 4 3 6% 8% 32%	2735
December	1st to 10th	Night	7% 12% 5% 13% 8% 6% 6% 5% 5% 6% 28%	2850
	11th to 20th	Night	8% 12% 5% 14% 7% 6% 6% 4 6% 6% 26%	3681
	21st to end	Night	4 8% 3 7% 5% 4 4 3 5% 5% 52%	5427

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	55% 9% 16% 15% 5%	2219
	11th to 20th	Day	56% 9% 16% 14% 5% 1	2357
	21st to end	Day	47% 8% 17% 24% 5%	2794
February	1st to 10th	Day	61% 5% 11% 16% 7%	1603
	11th to 20th	Day	56% 7% 13% 11% 12% 1	1674
	21st to end	Day	55% 8% 14% 15% 7%	1503
March	1st to 10th	Day	54% 8% 14% 21% 4	3130
	11th to 20th	Day	43% 9% 23% 20% 5%	3388
	21st to end	Day	52% 9% 14% 16% 9%	4067
April	1st to 10th	Day	42% 8% 17% 22% 11%	2280
	11th to 20th	Day	53% 6% 14% 18% 7% 2	2258
	21st to end	Day	48% 6% 16% 21% 8% 1	2650
May	1st to 10th	Day	48% 6% 14% 23% 7% 1	4430
	11th to 20th	Day	39% 11% 13% 24% 13%	4392
	21st to end	Day	43% 11% 17% 23% 7%	4825
June	1st to 10th	Day	43% 8% 14% 25% 9% 1	2986
	11th to 20th	Day	47% 9% 14% 20% 10% 1	3040
	21st to end	Day	34% 9% 18% 29% 9% 1	3040
July	1st to 10th	Day	29% 11% 22% 28% 9%	4676
	11th to 20th	Day	24% 9% 17% 35% 14% 1	4607
	21st to end	Day	19% 6% 15% 38% 19% 4	4651
August	1st to 10th	Day	28% 10% 20% 25% 17% 1	4396
	11th to 20th	Day	25% 8% 18% 36% 13% 1	4303
	21st to end	Day	28% 5% 15% 36% 14% 1	4306
September	1st to 10th	Day	31% 7% 16% 26% 16% 3	2280
	11th to 20th	Day	38% 7% 14% 27% 12% 2	2280
	21st to end	Day	32% 7% 13% 31% 15% 2	2037
October	1st to 10th	Day	35% 6% 15% 32% 11% 2	3170
	11th to 20th	Day	29% 5% 16% 37% 11% 2	3066
	21st to end	Day	40% 6% 17% 29% 8%	3091
November	1st to 10th	Day	54% 7% 14% 18% 8% 1	1552
	11th to 20th	Day	53% 7% 15% 18% 7% 1	1520
	21st to end	Day	53% 8% 18% 16% 4	1444
December	1st to 10th	Day	57% 8% 15% 14% 5% 1	1330
	11th to 20th	Day	56% 9% 21% 9% 6%	1507
	21st to end	Day	40% 4 13% 22% 13% 8%	2224
January	1st to 10th	Night	52% 9% 17% 19% 4	4726
	11th to 20th	Night	59% 6% 16% 14% 5%	4604
	21st to end	Night	46% 7% 19% 23% 4	4873
February	1st to 10th	Night	55% 7% 13% 18% 7%	2594
	11th to 20th	Night	51% 7% 14% 17% 10% 1	2403
	21st to end	Night	46% 9% 15% 20% 10%	1951
March	1st to 10th	Night	51% 8% 18% 19% 5%	3734
	11th to 20th	Night	41% 8% 24% 21% 6%	3587
	21st to end	Night	51% 8% 16% 18% 8%	3578
April	1st to 10th	Night	37% 6% 16% 26% 15% 1	1900
	11th to 20th	Night	49% 7% 13% 19% 10% 3	1872
	21st to end	Night	46% 7% 12% 24% 10% 1	1529
May	1st to 10th	Night	50% 6% 12% 21% 10% 1	2540
	11th to 20th	Night	37% 9% 12% 24% 15% 2	2518
	21st to end	Night	39% 10% 14% 29% 7%	2762
June	1st to 10th	Night	34% 8% 15% 28% 14% 1	1190
	11th to 20th	Night	37% 9% 18% 21% 14% 1	1140
	21st to end	Night	28% 9% 21% 31% 10% 1	1140
July	1st to 10th	Night	26% 9% 28% 27% 9% 1	2171
	11th to 20th	Night	20% 7% 16% 38% 18% 2	2232
	21st to end	Night	18% 5% 13% 41% 18% 5%	2674
August	1st to 10th	Night	25% 7% 19% 31% 17% 1	2520
	11th to 20th	Night	22% 7% 19% 35% 16% 1	2598
	21st to end	Night	24% 7% 15% 36% 16% 2	3359
September	1st to 10th	Night	29% 5% 12% 30% 20% 5%	1900
	11th to 20th	Night	33% 7% 14% 27% 16% 3	1900
	21st to end	Night	32% 5% 12% 31% 17% 2	2142
October	1st to 10th	Night	33% 5% 17% 31% 13% 1	3800
	11th to 20th	Night	26% 5% 15% 39% 14% 1	3831
	21st to end	Night	37% 4 12% 34% 11% 1	4467
November	1st to 10th	Night	52% 7% 13% 18% 7% 2	2596
	11th to 20th	Night	52% 7% 18% 16% 7% 1	2660
	21st to end	Night	50% 7% 19% 20% 4	2735
December	1st to 10th	Night	56% 7% 15% 17% 6%	2850
	11th to 20th	Night	57% 7% 15% 16% 5%	3679
	21st to end	Night	34% 5% 12% 27% 15% 7%	5427

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% 11% 29% 27% 16% 4	180
	11th to 20th	Day	10% 14% 31% 32% 13%	220
	21st to end	Day	11% 12% 31% 35% 10% 1	297
February	1st to 10th	Day	17% 9% 36% 30% 8% 1	270
	11th to 20th	Day	12% 7% 39% 27% 12% 3	270
	21st to end	Day	7% 6% 36% 32% 17% 2	225
March	1st to 10th	Day	15% 11% 37% 24% 10% 2	270
	11th to 20th	Day	11% 12% 41% 21% 11% 3	397
	21st to end	Day	14% 12% 36% 24% 13% 2	506
April	1st to 10th	Day	10% 16% 39% 28% 7% 1	460
	11th to 20th	Day	15% 17% 33% 25% 8% 2	452
	21st to end	Day	16% 11% 30% 27% 14% 1	640
May	1st to 10th	Day	13% 9% 28% 29% 18% 4	653
	11th to 20th	Day	10% 8% 27% 32% 16% 7%	675
	21st to end	Day	15% 10% 23% 28% 19% 5%	734
June	1st to 10th	Day	15% 11% 30% 25% 15% 4	680
	11th to 20th	Day	18% 13% 34% 22% 11% 3	680
	21st to end	Day	9% 9% 26% 33% 18% 6%	680
July	1st to 10th	Day	7% 5% 23% 34% 24% 6%	671
	11th to 20th	Day	7% 7% 26% 34% 19% 7%	668
	21st to end	Day	3 7% 26% 31% 24% 9%	739
August	1st to 10th	Day	9% 5% 21% 37% 21% 7%	676
	11th to 20th	Day	8% 6% 21% 32% 25% 7%	622
	21st to end	Day	9% 8% 24% 34% 20% 5%	539
September	1st to 10th	Day	12% 11% 30% 29% 15% 3	490
	11th to 20th	Day	14% 9% 29% 30% 16% 1	490
	21st to end	Day	14% 11% 32% 25% 15% 2	314
October	1st to 10th	Day	19% 6% 30% 24% 18% 4	300
	11th to 20th	Day	11% 13% 32% 29% 13% 3	300
	21st to end	Day	12% 13% 39% 25% 9% 2	330
November	1st to 10th	Day	22% 9% 31% 25% 10% 3	279
	11th to 20th	Day	13% 10% 38% 28% 10%	270
	21st to end	Day	10% 13% 39% 28% 9% 2	270
December	1st to 10th	Day	12% 7% 43% 26% 10% 2	270
	11th to 20th	Day	11% 9% 50% 23% 7%	212
	21st to end	Day	12% 7% 34% 32% 13% 2	198
January	1st to 10th	Night	9% 10% 38% 32% 10% 1	950
	11th to 20th	Night	11% 13% 36% 32% 7% 1	950
	21st to end	Night	12% 10% 39% 29% 9% 1	1045
February	1st to 10th	Night	10% 9% 34% 34% 11% 1	884
	11th to 20th	Night	13% 8% 35% 32% 10% 1	744
	21st to end	Night	5% 6% 29% 36% 20% 4	628
March	1st to 10th	Night	11% 8% 35% 32% 13% 1	760
	11th to 20th	Night	9% 8% 37% 33% 11% 2	760
	21st to end	Night	13% 8% 29% 38% 11% 1	689
April	1st to 10th	Night	10% 9% 33% 37% 10% 1	570
	11th to 20th	Night	15% 11% 34% 32% 7% 1	563
	21st to end	Night	16% 8% 31% 37% 8%	570
May	1st to 10th	Night	18% 6% 25% 34% 16% 1	570
	11th to 20th	Night	13% 6% 29% 35% 16% 1	561
	21st to end	Night	18% 7% 24% 33% 17% 1	617
June	1st to 10th	Night	13% 7% 32% 31% 16% 1	406
	11th to 20th	Night	14% 7% 31% 35% 13%	380
	21st to end	Night	9% 6% 24% 43% 17% 1	380
July	1st to 10th	Night	6% 4 18% 50% 20% 1	370
	11th to 20th	Night	7% 3 25% 45% 18% 2	396
	21st to end	Night	4 4 26% 44% 20% 2	624
August	1st to 10th	Night	8% 4 23% 42% 21% 2	567
	11th to 20th	Night	5% 3 21% 43% 26% 2	564
	21st to end	Night	9% 4 26% 41% 20% 1	627
September	1st to 10th	Night	10% 5% 26% 42% 15% 2	570
	11th to 20th	Night	11% 5% 24% 43% 15% 1	570
	21st to end	Night	12% 6% 33% 37% 11% 1	636
October	1st to 10th	Night	19% 6% 26% 34% 14% 1	760
	11th to 20th	Night	11% 9% 30% 36% 13% 1	788
	21st to end	Night	13% 10% 36% 33% 8% 1	1045
November	1st to 10th	Night	18% 10% 35% 30% 6% 1	943
	11th to 20th	Night	12% 11% 36% 30% 9% 1	950
	21st to end	Night	11% 11% 41% 30% 7% 1	950
December	1st to 10th	Night	13% 7% 39% 28% 12% 2	950
	11th to 20th	Night	12% 11% 38% 28% 11% 1	950
	21st to end	Night	13% 7% 34% 31% 13% 2	1045

Page generated at 2024-11-01 20:47:37. Version ac07

Copyright © 2024 Attilla Danko.