La Ronge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the La Ronge clear sky chart from 2005-11-06 to 2024-11-12.

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	11% 9% 3 9% 6% 5% 5% 4 6% 7% 33%	105893
	Night	9% 11% 4 10% 7% 6% 5% 4 6% 7% 31%	101846
Transparency	Day	47% 4 16% 24% 8% 1	105622
	Night	52% 4 14% 22% 7% 1	101764
Seeing	Day	15% 4 21% 32% 21% 6%	15869
	Night	16% 4 23% 35% 18% 3	25015

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% 8% 23% 12% 7% 6% 3 4 3 16%	1899
	11th to 20th	Day	5% 13% 6% 16% 13% 11% 8% 5% 6% 6% 12%	2040
	21st to end	Day	7% 16% 6% 15% 6% 5% 5% 4 6% 5% 23%	2477
February	1st to 10th	Day	5% 10% 5% 13% 8% 9% 9% 6% 6% 8% 21%	1520
	11th to 20th	Day	6% 11% 5% 9% 7% 8% 8% 5% 6% 7% 28%	1608
	21st to end	Day	4 9% 4 13% 8% 7% 7% 3 8% 7% 29%	1444
March	1st to 10th	Day	5% 11% 4 8% 6% 7% 6% 4 6% 8% 34%	3130
	11th to 20th	Day	6% 8% 3 9% 8% 6% 5% 4 6% 7% 38%	3343
	21st to end	Day	5% 11% 3 9% 4 4 5% 4 5% 7% 43%	4098
April	1st to 10th	Day	8% 9% 3 8% 5% 6% 5% 5% 4 8% 39%	2280
	11th to 20th	Day	10% 12% 3 10% 6% 5% 5% 4 6% 7% 31%	2443
	21st to end	Day	11% 9% 3 9% 6% 6% 5% 4 7% 6% 35%	2660
May	1st to 10th	Day	11% 10% 4 8% 6% 5% 5% 4 6% 8% 33%	4430
	11th to 20th	Day	20% 9% 3 6% 4 4 4 4 6% 6% 33%	4718
	21st to end	Day	14% 10% 3 10% 6% 5% 5% 4 5% 7% 32%	5509
June	1st to 10th	Day	16% 9% 3 8% 6% 5% 5% 3 6% 8% 31%	3040
	11th to 20th	Day	19% 8% 3 8% 5% 5% 5% 5% 7% 8% 27%	3040
	21st to end	Day	16% 8% 3 6% 5% 5% 5% 5% 8% 7% 32%	3040
July	1st to 10th	Day	8% 4 1 5% 4 5% 5% 5% 8% 10% 43%	5060
	11th to 20th	Day	8% 4 2 5% 4 5% 5% 4 6% 9% 47%	5060
	21st to end	Day	10% 5% 2 7% 5% 5% 6% 5% 7% 9% 39%	5215
August	1st to 10th	Day	7% 5% 2 5% 4 4 5% 4 8% 11% 45%	4442
	11th to 20th	Day	9% 7% 2 7% 5% 5% 6% 5% 7% 9% 39%	4343
	21st to end	Day	11% 6% 2 6% 5% 4 5% 4 6% 9% 41%	4590
September	1st to 10th	Day	12% 7% 2 8% 6% 5% 5% 5% 6% 8% 37%	2280
	11th to 20th	Day	16% 10% 3 9% 5% 4 5% 4 6% 7% 31%	2280
	21st to end	Day	13% 9% 3 7% 4 4 4 4 5% 7% 39%	2033
October	1st to 10th	Day	13% 11% 4 8% 5% 5% 5% 4 6% 7% 31%	3170
	11th to 20th	Day	11% 11% 4 8% 6% 5% 7% 5% 7% 8% 30%	2936
	21st to end	Day	15% 15% 6% 12% 6% 5% 5% 4 6% 6% 21%	2949
November	1st to 10th	Day	16% 21% 7% 13% 6% 5% 4 3 4 4 16%	1565
	11th to 20th	Day	13% 15% 6% 16% 10% 6% 5% 4 4 4 17%	1337
	21st to end	Day	9% 18% 8% 16% 8% 6% 4 3 5% 5% 18%	1245
December	1st to 10th	Day	5% 13% 6% 14% 10% 8% 7% 5% 7% 8% 17%	1140
	11th to 20th	Day	11% 14% 4 14% 7% 7% 6% 4 7% 5% 21%	1439
	21st to end	Day	4 8% 3 9% 8% 6% 5% 4 7% 6% 40%	2090
January	1st to 10th	Night	6% 14% 8% 21% 11% 8% 7% 3 4 3 15%	5046
	11th to 20th	Night	4 10% 5% 17% 13% 11% 8% 7% 7% 7% 12%	4857
	21st to end	Night	7% 15% 6% 13% 7% 6% 6% 5% 5% 5% 24%	5179
February	1st to 10th	Night	7% 12% 4 11% 8% 7% 8% 6% 7% 7% 23%	2660
	11th to 20th	Night	5% 10% 5% 11% 8% 6% 9% 6% 5% 5% 30%	2477
	21st to end	Night	4 10% 4 11% 9% 7% 7% 5% 7% 7% 30%	2010
March	1st to 10th	Night	8% 12% 5% 10% 6% 7% 5% 3 5% 7% 32%	3734
	11th to 20th	Night	7% 11% 4 10% 6% 5% 4 4 7% 9% 34%	3628
	21st to end	Night	7% 11% 4 9% 5% 4 3 3 5% 7% 44%	3546
April	1st to 10th	Night	8% 11% 3 9% 5% 6% 5% 4 6% 7% 35%	1900
	11th to 20th	Night	13% 9% 4 9% 7% 4 4 4 5% 7% 34%	1686
	21st to end	Night	12% 10% 4 7% 5% 5% 5% 4 4 8% 35%	1520
May	1st to 10th	Night	13% 11% 4 8% 5% 6% 5% 5% 6% 6% 30%	2540
	11th to 20th	Night	18% 7% 2 6% 5% 5% 5% 4 6% 6% 37%	2178
	21st to end	Night	14% 12% 3 8% 5% 4 4 3 5% 8% 33%	2066
June	1st to 10th	Night	15% 7% 3 7% 6% 5% 4 5% 8% 8% 33%	1140
	11th to 20th	Night	16% 6% 3 9% 6% 4 6% 5% 7% 9% 28%	1140
	21st to end	Night	15% 8% 2 8% 4 5% 5% 3 7% 8% 34%	1140
July	1st to 10th	Night	7% 3 2 6% 5% 5% 7% 5% 9% 13% 39%	1900
	11th to 20th	Night	7% 4 1 5% 4 4 4 4 6% 10% 50%	1900
	21st to end	Night	11% 5% 2 6% 4 4 5% 4 7% 9% 42%	2334
August	1st to 10th	Night	9% 4 2 5% 4 3 5% 4 7% 10% 47%	2497
	11th to 20th	Night	8% 4 2 6% 5% 4 5% 5% 7% 9% 45%	2496
	21st to end	Night	9% 4 2 5% 3 4 5% 4 7% 9% 48%	3073
September	1st to 10th	Night	11% 6% 3 7% 5% 4 4 4 6% 9% 39%	1900
	11th to 20th	Night	15% 9% 2 6% 4 4 4 4 6% 8% 36%	1900
	21st to end	Night	11% 5% 2 6% 4 4 4 4 7% 9% 43%	2145
October	1st to 10th	Night	15% 10% 3 7% 4 3 3 3 5% 8% 38%	3800
	11th to 20th	Night	10% 13% 4 9% 5% 4 5% 4 6% 7% 33%	3960
	21st to end	Night	14% 17% 6% 11% 5% 5% 5% 4 5% 5% 22%	4605
November	1st to 10th	Night	15% 18% 6% 14% 8% 5% 4 3 4 6% 17%	2732
	11th to 20th	Night	12% 14% 6% 15% 10% 7% 5% 3 4 4 19%	2866
	21st to end	Night	8% 16% 6% 14% 9% 7% 5% 5% 5% 5% 20%	2932
December	1st to 10th	Night	6% 13% 5% 15% 11% 9% 7% 5% 5% 6% 19%	3040
	11th to 20th	Night	10% 15% 5% 15% 7% 6% 6% 5% 5% 6% 20%	3753
	21st to end	Night	5% 9% 4 9% 6% 6% 6% 4 6% 6% 41%	5566

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	73% 2 11% 11% 3	1899
	11th to 20th	Day	73% 2 13% 8% 3	2060
	21st to end	Day	62% 2 14% 16% 5%	2477
February	1st to 10th	Day	58% 4 10% 19% 8%	1520
	11th to 20th	Day	52% 3 13% 24% 8%	1617
	21st to end	Day	51% 3 15% 23% 8% 1	1444
March	1st to 10th	Day	47% 2 14% 32% 4 1	3130
	11th to 20th	Day	45% 2 15% 24% 12%	3344
	21st to end	Day	40% 2 8% 26% 23% 1	4098
April	1st to 10th	Day	44% 3 14% 25% 13% 1	2280
	11th to 20th	Day	50% 3 12% 22% 12% 1	2443
	21st to end	Day	47% 3 9% 27% 11% 2	2660
May	1st to 10th	Day	48% 2 9% 29% 12% 1	4430
	11th to 20th	Day	50% 2 12% 22% 12% 2	4722
	21st to end	Day	52% 2 13% 23% 9% 1	5510
June	1st to 10th	Day	49% 3 11% 24% 12% 1	3040
	11th to 20th	Day	52% 3 14% 22% 8% 1	3040
	21st to end	Day	46% 4 16% 24% 9% 1	3040
July	1st to 10th	Day	32% 5% 19% 36% 7% 1	4981
	11th to 20th	Day	30% 5% 17% 36% 12%	4973
	21st to end	Day	38% 7% 25% 27% 4	5050
August	1st to 10th	Day	29% 4 28% 34% 3	4425
	11th to 20th	Day	38% 7% 26% 24% 4	4385
	21st to end	Day	38% 5% 24% 30% 3	4589
September	1st to 10th	Day	44% 5% 20% 21% 9% 1	2280
	11th to 20th	Day	51% 4 18% 22% 4	2280
	21st to end	Day	44% 3 20% 25% 7% 1	2033
October	1st to 10th	Day	51% 4 15% 24% 5%	3170
	11th to 20th	Day	51% 6% 16% 23% 4	2936
	21st to end	Day	64% 7% 13% 14% 2	2949
November	1st to 10th	Day	73% 4 8% 12% 4	1565
	11th to 20th	Day	73% 4 12% 10% 2	1337
	21st to end	Day	69% 4 13% 11% 3	1245
December	1st to 10th	Day	64% 6% 11% 14% 5%	1140
	11th to 20th	Day	63% 4 17% 12% 3	1440
	21st to end	Day	43% 3 13% 25% 15% 1	2090
January	1st to 10th	Night	74% 3 9% 12% 3	5046
	11th to 20th	Night	69% 3 13% 13% 2	4899
	21st to end	Night	61% 3 17% 14% 5%	5179
February	1st to 10th	Night	55% 5% 13% 17% 9%	2660
	11th to 20th	Night	54% 4 14% 22% 7%	2478
	21st to end	Night	51% 4 11% 24% 10%	2010
March	1st to 10th	Night	53% 2 12% 25% 6% 1	3734
	11th to 20th	Night	47% 2 11% 31% 8%	3628
	21st to end	Night	41% 2 6% 26% 25% 1	3546
April	1st to 10th	Night	48% 3 12% 22% 13% 2	1900
	11th to 20th	Night	51% 2 8% 21% 16% 2	1686
	21st to end	Night	48% 4 8% 25% 13% 3	1520
May	1st to 10th	Night	52% 2 7% 23% 15% 1	2540
	11th to 20th	Night	48% 2 9% 23% 14% 3	2178
	21st to end	Night	51% 2 13% 24% 9% 1	2066
June	1st to 10th	Night	47% 4 12% 22% 14% 2	1140
	11th to 20th	Night	51% 6% 11% 21% 10% 1	1140
	21st to end	Night	47% 3 14% 24% 11% 1	1140
July	1st to 10th	Night	32% 8% 18% 35% 6%	1870
	11th to 20th	Night	29% 4 15% 41% 10%	1864
	21st to end	Night	38% 6% 20% 29% 7%	2260
August	1st to 10th	Night	29% 6% 23% 37% 6%	2490
	11th to 20th	Night	35% 6% 25% 28% 7%	2520
	21st to end	Night	32% 5% 21% 38% 4	3073
September	1st to 10th	Night	41% 4 20% 25% 9% 1	1900
	11th to 20th	Night	45% 4 19% 26% 6%	1900
	21st to end	Night	37% 4 17% 31% 9% 1	2145
October	1st to 10th	Night	45% 4 16% 29% 6%	3800
	11th to 20th	Night	51% 5% 14% 26% 5%	3960
	21st to end	Night	63% 7% 13% 15% 3	4605
November	1st to 10th	Night	71% 4 10% 11% 3	2732
	11th to 20th	Night	71% 4 12% 10% 2	2866
	21st to end	Night	67% 5% 12% 13% 2	2932
December	1st to 10th	Night	66% 4 12% 14% 3	3040
	11th to 20th	Night	64% 4 14% 12% 4	3751
	21st to end	Night	44% 3 14% 27% 11% 1	5566

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	9% 4 29% 33% 21% 4	180
	11th to 20th	Day	14% 3 25% 36% 16% 6%	180
	21st to end	Day	15% 5% 22% 38% 17% 3	209
February	1st to 10th	Day	8% 5% 27% 38% 19% 4	270
	11th to 20th	Day	7% 4 24% 39% 21% 5%	270
	21st to end	Day	8% 5% 25% 31% 28% 4	225
March	1st to 10th	Day	12% 3 21% 31% 25% 8%	270
	11th to 20th	Day	11% 5% 22% 34% 22% 6%	366
	21st to end	Day	15% 3 25% 31% 20% 6%	506
April	1st to 10th	Day	12% 5% 22% 40% 15% 7%	460
	11th to 20th	Day	16% 3 23% 34% 18% 5%	541
	21st to end	Day	14% 4 22% 34% 21% 5%	650
May	1st to 10th	Day	14% 4 19% 35% 20% 7%	653
	11th to 20th	Day	14% 4 20% 33% 23% 6%	675
	21st to end	Day	16% 3 17% 34% 23% 7%	734
June	1st to 10th	Day	21% 5% 20% 29% 20% 5%	680
	11th to 20th	Day	21% 4 20% 31% 20% 4	680
	21st to end	Day	18% 2 17% 31% 23% 9%	680
July	1st to 10th	Day	14% 3 17% 32% 27% 7%	671
	11th to 20th	Day	13% 3 17% 30% 27% 10%	668
	21st to end	Day	13% 2 16% 30% 29% 10%	739
August	1st to 10th	Day	12% 4 15% 30% 29% 9%	676
	11th to 20th	Day	13% 2 20% 31% 25% 9%	665
	21st to end	Day	15% 4 19% 31% 22% 7%	636
September	1st to 10th	Day	16% 8% 24% 32% 18% 3	490
	11th to 20th	Day	19% 4 21% 34% 16% 5%	490
	21st to end	Day	15% 7% 26% 29% 20% 3	314
October	1st to 10th	Day	19% 7% 25% 32% 17% 1	300
	11th to 20th	Day	18% 10% 31% 26% 11% 4	300
	21st to end	Day	24% 8% 25% 27% 14% 4	330
November	1st to 10th	Day	22% 6% 24% 30% 16% 2	300
	11th to 20th	Day	18% 8% 34% 31% 9%	273
	21st to end	Day	18% 6% 31% 34% 9% 2	230
December	1st to 10th	Day	12% 3 26% 29% 24% 6%	180
	11th to 20th	Day	15% 6% 32% 33% 13% 1	180
	21st to end	Day	11% 2 25% 34% 20% 8%	198
January	1st to 10th	Night	16% 5% 27% 33% 17% 2	950
	11th to 20th	Night	14% 3 29% 39% 14% 2	950
	21st to end	Night	18% 7% 27% 34% 12% 2	1045
February	1st to 10th	Night	13% 3 28% 35% 17% 4	950
	11th to 20th	Night	10% 3 24% 40% 20% 4	818
	21st to end	Night	7% 3 21% 41% 25% 3	628
March	1st to 10th	Night	14% 4 22% 37% 20% 3	760
	11th to 20th	Night	14% 3 28% 38% 15% 2	760
	21st to end	Night	15% 2 21% 31% 26% 5%	670
April	1st to 10th	Night	16% 1 21% 38% 21% 3	570
	11th to 20th	Night	17% 2 22% 39% 16% 3	563
	21st to end	Night	16% 2 24% 39% 17% 2	570
May	1st to 10th	Night	17% 2 19% 40% 19% 2	570
	11th to 20th	Night	14% 3 22% 37% 20% 4	492
	21st to end	Night	19% 3 13% 41% 20% 4	411
June	1st to 10th	Night	19% 4 18% 32% 24% 3	380
	11th to 20th	Night	20% 3 19% 32% 21% 4	380
	21st to end	Night	18% 3 14% 32% 28% 6%	380
July	1st to 10th	Night	12% 2 15% 34% 34% 4	370
	11th to 20th	Night	14% 4 13% 36% 27% 7%	368
	21st to end	Night	15% 2 14% 32% 28% 8%	416
August	1st to 10th	Night	15% 2 13% 30% 31% 9%	548
	11th to 20th	Night	11% 3 21% 33% 25% 7%	564
	21st to end	Night	16% 5% 14% 39% 23% 4	627
September	1st to 10th	Night	16% 3 22% 32% 25% 2	570
	11th to 20th	Night	22% 4 19% 37% 18% 1	570
	21st to end	Night	14% 5% 30% 36% 14% 1	639
October	1st to 10th	Night	29% 6% 24% 28% 12% 1	760
	11th to 20th	Night	22% 9% 25% 30% 12% 2	865
	21st to end	Night	22% 11% 29% 26% 11% 2	1045
November	1st to 10th	Night	25% 8% 26% 27% 12% 2	975
	11th to 20th	Night	18% 7% 29% 34% 10% 2	956
	21st to end	Night	16% 6% 34% 32% 10% 2	950
December	1st to 10th	Night	11% 4 25% 38% 18% 4	950
	11th to 20th	Night	16% 5% 27% 32% 16% 3	950
	21st to end	Night	13% 3 20% 39% 21% 4	1045

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