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 2025-08-05.

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	8% 8% 3 8% 5% 5% 5% 4 6% 8% 39%	129366
	Night	7% 9% 4 9% 6% 5% 5% 4 6% 7% 38%	127462
Transparency	Day	41% 7% 16% 24% 10% 1	129080
	Night	43% 7% 16% 23% 10% 1	127328
Seeing	Day	12% 10% 30% 29% 15% 4	16967
	Night	12% 8% 32% 34% 12% 1	26339

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% 13% 6% 13% 8% 8% 7% 5% 7% 4 22%	3179
	11th to 20th	Day	3 8% 4 11% 8% 7% 8% 8% 7% 8% 28%	3365
	21st to end	Day	5% 10% 5% 13% 6% 5% 4 4 5% 7% 35%	4004
February	1st to 10th	Day	8% 14% 5% 12% 8% 7% 6% 4 5% 5% 24%	1688
	11th to 20th	Day	7% 12% 5% 11% 7% 6% 6% 5% 7% 6% 27%	1755
	21st to end	Day	4 12% 5% 11% 10% 6% 7% 6% 7% 8% 24%	1580
March	1st to 10th	Day	6% 12% 5% 14% 7% 5% 4 3 4 6% 33%	4500
	11th to 20th	Day	4 13% 7% 15% 6% 5% 4 3 5% 7% 31%	4855
	21st to end	Day	7% 13% 6% 15% 6% 6% 5% 4 6% 7% 26%	5832
April	1st to 10th	Day	6% 10% 3 7% 5% 7% 6% 4 6% 8% 38%	2400
	11th to 20th	Day	12% 13% 5% 9% 6% 5% 4 4 6% 7% 29%	2378
	21st to end	Day	14% 10% 4 8% 5% 4 4 3 4 6% 37%	2790
May	1st to 10th	Day	14% 9% 2 5% 3 4 4 3 5% 6% 43%	6340
	11th to 20th	Day	14% 8% 3 7% 6% 5% 6% 6% 7% 8% 30%	6298
	21st to end	Day	11% 6% 2 6% 5% 5% 4 4 6% 7% 43%	6926
June	1st to 10th	Day	16% 6% 2 6% 5% 4 5% 5% 6% 8% 37%	3144
	11th to 20th	Day	17% 8% 3 6% 5% 5% 4 5% 6% 8% 33%	3200
	21st to end	Day	9% 5% 2 5% 5% 5% 5% 4 7% 9% 44%	3200
July	1st to 10th	Day	4 4 2 6% 5% 5% 6% 5% 7% 10% 47%	6790
	11th to 20th	Day	7% 4 2 6% 4 4 6% 5% 7% 10% 44%	6702
	21st to end	Day	4 4 2 5% 4 4 4 3 5% 8% 58%	6898
August	1st to 10th	Day	7% 4 2 5% 3 4 5% 4 7% 8% 50%	4469
	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	11% 15% 4 7% 5% 6% 5% 3 4 7% 32%	1608
	11th to 20th	Day	7% 10% 4 14% 8% 6% 5% 4 5% 6% 31%	1600
	21st to end	Day	9% 12% 5% 11% 7% 6% 6% 4 5% 5% 30%	1519
December	1st to 10th	Day	5% 13% 5% 13% 9% 8% 6% 5% 5% 5% 27%	2290
	11th to 20th	Day	7% 15% 5% 14% 8% 7% 6% 4 7% 7% 21%	2368
	21st to end	Day	5% 7% 4 10% 8% 5% 5% 4 5% 7% 41%	3196
January	1st to 10th	Night	3 12% 5% 14% 9% 7% 8% 5% 6% 6% 26%	6766
	11th to 20th	Night	4 8% 4 13% 9% 9% 8% 5% 8% 6% 24%	6539
	21st to end	Night	5% 11% 5% 12% 6% 5% 5% 4 6% 7% 34%	6974
February	1st to 10th	Night	6% 13% 5% 11% 8% 7% 7% 5% 6% 8% 25%	2730
	11th to 20th	Night	7% 11% 3 11% 7% 6% 6% 5% 6% 8% 30%	2532
	21st to end	Night	3 9% 4 11% 8% 6% 6% 4 8% 8% 34%	2050
March	1st to 10th	Night	5% 10% 5% 12% 8% 5% 6% 5% 7% 8% 29%	5374
	11th to 20th	Night	7% 11% 4 10% 7% 6% 5% 4 5% 8% 33%	5136
	21st to end	Night	8% 13% 6% 14% 7% 5% 5% 4 5% 8% 25%	5127
April	1st to 10th	Night	7% 9% 3 6% 5% 5% 5% 4 6% 9% 43%	2000
	11th to 20th	Night	10% 15% 4 8% 5% 4 4 4 6% 7% 32%	1971
	21st to end	Night	12% 8% 3 9% 6% 5% 5% 3 5% 8% 35%	1609
May	1st to 10th	Night	16% 8% 2 5% 3 3 4 3 5% 7% 44%	3640
	11th to 20th	Night	17% 8% 3 7% 5% 4 5% 4 6% 8% 33%	3618
	21st to end	Night	12% 8% 2 6% 4 3 4 3 5% 6% 46%	3972
June	1st to 10th	Night	11% 6% 1 4 4 5% 5% 4 8% 9% 43%	1252
	11th to 20th	Night	13% 5% 2 6% 5% 4 4 4 6% 9% 41%	1200
	21st to end	Night	7% 5% 2 5% 4 5% 4 4 6% 9% 50%	1200
July	1st to 10th	Night	6% 4 2 5% 4 5% 4 5% 7% 9% 49%	3166
	11th to 20th	Night	7% 4 2 5% 4 4 5% 4 6% 9% 50%	3262
	21st to end	Night	5% 4 2 4 3 3 3 3 5% 7% 61%	3968
August	1st to 10th	Night	7% 4 2 4 3 3 4 4 6% 8% 56%	2560
	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%	2687
	11th to 20th	Night	8% 10% 5% 13% 6% 5% 6% 3 7% 7% 30%	2800
	21st to end	Night	7% 13% 5% 11% 6% 6% 5% 3 6% 8% 30%	2879
December	1st to 10th	Night	8% 15% 6% 14% 7% 7% 6% 4 5% 6% 23%	4900
	11th to 20th	Night	7% 13% 6% 14% 9% 7% 7% 4 6% 6% 21%	5822
	21st to end	Night	3 7% 3 11% 7% 6% 5% 4 5% 6% 44%	7755

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% 13% 13% 5%	3179
	11th to 20th	Day	50% 8% 15% 17% 10% 1	3387
	21st to end	Day	48% 7% 23% 19% 3	4004
February	1st to 10th	Day	60% 5% 11% 15% 8%	1688
	11th to 20th	Day	55% 7% 13% 12% 12% 1	1764
	21st to end	Day	54% 8% 15% 16% 7%	1580
March	1st to 10th	Day	50% 7% 18% 20% 6%	4500
	11th to 20th	Day	52% 8% 18% 18% 4	4856
	21st to end	Day	54% 9% 13% 16% 8%	5832
April	1st to 10th	Day	41% 8% 17% 22% 12% 1	2400
	11th to 20th	Day	53% 6% 14% 18% 7% 2	2378
	21st to end	Day	48% 5% 16% 21% 8% 2	2790
May	1st to 10th	Day	40% 6% 12% 25% 15% 2	6340
	11th to 20th	Day	46% 10% 14% 21% 9%	6302
	21st to end	Day	36% 8% 14% 27% 14% 1	6926
June	1st to 10th	Day	42% 8% 14% 25% 10% 1	3144
	11th to 20th	Day	47% 8% 14% 20% 9% 1	3200
	21st to end	Day	35% 9% 18% 30% 9% 1	3200
July	1st to 10th	Day	28% 10% 23% 27% 12%	6716
	11th to 20th	Day	31% 9% 18% 30% 10% 1	6621
	21st to end	Day	24% 7% 17% 34% 16% 3	6705
August	1st to 10th	Day	28% 10% 20% 25% 16% 1	4453
	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	53% 7% 14% 18% 8%	1608
	11th to 20th	Day	54% 7% 14% 18% 6% 1	1600
	21st to end	Day	55% 8% 18% 16% 4	1519
December	1st to 10th	Day	57% 9% 17% 13% 3	2290
	11th to 20th	Day	61% 7% 21% 6% 4	2369
	21st to end	Day	43% 4 11% 23% 12% 5%	3196
January	1st to 10th	Night	55% 8% 15% 17% 5%	6766
	11th to 20th	Night	55% 6% 15% 14% 9%	6579
	21st to end	Night	49% 7% 22% 19% 3	6974
February	1st to 10th	Night	55% 7% 13% 17% 7%	2730
	11th to 20th	Night	50% 7% 13% 18% 11% 1	2533
	21st to end	Night	44% 8% 16% 21% 10%	2050
March	1st to 10th	Night	48% 9% 20% 18% 5%	5374
	11th to 20th	Night	47% 8% 18% 21% 5%	5136
	21st to end	Night	56% 7% 13% 18% 7%	5127
April	1st to 10th	Night	37% 6% 16% 26% 15% 1	2000
	11th to 20th	Night	48% 7% 12% 19% 10% 3	1971
	21st to end	Night	46% 7% 12% 24% 10% 1	1609
May	1st to 10th	Night	38% 6% 11% 27% 18% 2	3640
	11th to 20th	Night	46% 9% 14% 20% 11% 2	3618
	21st to end	Night	35% 8% 12% 27% 15% 2	3972
June	1st to 10th	Night	34% 8% 14% 28% 15% 1	1252
	11th to 20th	Night	37% 9% 18% 22% 13% 1	1200
	21st to end	Night	28% 9% 21% 31% 10% 1	1200
July	1st to 10th	Night	27% 9% 26% 30% 8%	3131
	11th to 20th	Night	29% 7% 17% 34% 12% 1	3220
	21st to end	Night	22% 6% 18% 34% 16% 4	3856
August	1st to 10th	Night	25% 7% 19% 32% 17% 1	2552
	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% 19% 7% 2	2687
	11th to 20th	Night	52% 7% 17% 16% 6% 1	2800
	21st to end	Night	52% 7% 18% 19% 4	2879
December	1st to 10th	Night	62% 7% 16% 11% 3	4900
	11th to 20th	Night	62% 7% 17% 11% 3	5820
	21st to end	Night	41% 5% 11% 25% 13% 5%	7755

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% 12% 29% 29% 15% 4	200
	11th to 20th	Day	9% 15% 33% 31% 11%	245
	21st to end	Day	11% 13% 33% 34% 9% 1	330
February	1st to 10th	Day	16% 9% 37% 29% 8% 1	300
	11th to 20th	Day	11% 7% 37% 29% 13% 3	300
	21st to end	Day	7% 8% 36% 31% 16% 2	249
March	1st to 10th	Day	14% 10% 37% 25% 11% 2	300
	11th to 20th	Day	12% 12% 41% 22% 10% 3	434
	21st to end	Day	14% 13% 35% 23% 13% 2	550
April	1st to 10th	Day	9% 15% 39% 28% 6% 1	500
	11th to 20th	Day	14% 18% 34% 25% 8% 2	492
	21st to end	Day	16% 12% 30% 27% 14% 2	690
May	1st to 10th	Day	13% 9% 28% 29% 18% 4	703
	11th to 20th	Day	12% 9% 27% 31% 15% 6%	725
	21st to end	Day	15% 10% 23% 29% 18% 5%	789
June	1st to 10th	Day	15% 11% 30% 25% 14% 5%	730
	11th to 20th	Day	18% 12% 33% 22% 12% 2	730
	21st to end	Day	9% 9% 26% 33% 17% 6%	730
July	1st to 10th	Day	7% 6% 23% 35% 24% 6%	721
	11th to 20th	Day	8% 8% 26% 33% 19% 7%	718
	21st to end	Day	4 7% 25% 32% 24% 9%	794
August	1st to 10th	Day	9% 5% 21% 37% 22% 7%	697
	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	21% 9% 33% 26% 9% 3	300
	11th to 20th	Day	13% 11% 38% 28% 9%	300
	21st to end	Day	10% 13% 40% 27% 8% 2	300
December	1st to 10th	Day	12% 8% 44% 25% 9% 2	300
	11th to 20th	Day	11% 9% 48% 25% 6%	235
	21st to end	Day	11% 7% 33% 32% 15% 2	220
January	1st to 10th	Night	9% 11% 37% 33% 10% 1	1000
	11th to 20th	Night	11% 13% 37% 32% 7% 1	1000
	21st to end	Night	11% 11% 40% 28% 9% 1	1100
February	1st to 10th	Night	11% 10% 34% 33% 11% 1	930
	11th to 20th	Night	12% 8% 34% 34% 11% 1	784
	21st to end	Night	5% 7% 29% 36% 19% 4	660
March	1st to 10th	Night	10% 8% 35% 33% 14% 1	800
	11th to 20th	Night	10% 8% 37% 33% 11% 2	800
	21st to end	Night	14% 8% 29% 37% 11% 1	725
April	1st to 10th	Night	10% 9% 33% 38% 10% 1	600
	11th to 20th	Night	15% 11% 35% 32% 6% 1	593
	21st to end	Night	16% 8% 31% 37% 9%	600
May	1st to 10th	Night	18% 6% 26% 34% 16% 1	600
	11th to 20th	Night	14% 7% 29% 34% 15% 1	591
	21st to end	Night	18% 7% 24% 34% 16% 1	650
June	1st to 10th	Night	13% 7% 33% 31% 16% 1	427
	11th to 20th	Night	14% 7% 30% 37% 12%	400
	21st to end	Night	10% 6% 25% 42% 16% 1	400
July	1st to 10th	Night	6% 4 18% 50% 20% 1	390
	11th to 20th	Night	8% 3 25% 45% 17% 1	418
	21st to end	Night	5% 4 25% 44% 20% 2	657
August	1st to 10th	Night	8% 4 22% 42% 21% 2	579
	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	975
	11th to 20th	Night	13% 11% 36% 30% 9% 1	1000
	21st to end	Night	11% 11% 41% 30% 7% 1	1000
December	1st to 10th	Night	13% 7% 39% 28% 11% 2	1000
	11th to 20th	Night	12% 11% 38% 28% 10% 1	1000
	21st to end	Night	12% 7% 35% 32% 13% 2	1100

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