Balsam Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Balsam Lake clear sky chart from 2005-11-06 to 2024-11-05.

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	13% 9% 3 8% 5% 5% 5% 4 6% 7% 37%	101633
	Night	12% 10% 4 9% 5% 4 4 4 5% 6% 38%	97518
Transparency	Day	45% 7% 13% 24% 11% 1	105203
	Night	45% 6% 12% 23% 12% 1	102075
Seeing	Day	16% 10% 31% 26% 13% 4	16053
	Night	15% 9% 33% 31% 10% 1	25913

By Month

Percentage Cloud Cover SE (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	12% 15% 5% 17% 7% 5% 5% 3 4 6% 21%	2527
	11th to 20th	Day	6% 10% 5% 14% 10% 10% 10% 6% 6% 5% 19%	2530
	21st to end	Day	8% 18% 9% 15% 5% 4 5% 3 5% 6% 22%	3043
February	1st to 10th	Day	8% 12% 5% 10% 6% 5% 6% 5% 6% 7% 31%	1710
	11th to 20th	Day	7% 11% 5% 9% 7% 5% 5% 4 5% 6% 34%	1664
	21st to end	Day	9% 13% 5% 10% 6% 5% 4 4 5% 7% 33%	1498
March	1st to 10th	Day	10% 11% 4 7% 5% 4 4 3 5% 7% 39%	3275
	11th to 20th	Day	9% 9% 3 8% 4 6% 4 4 5% 8% 39%	3480
	21st to end	Day	19% 12% 4 11% 7% 4 5% 3 5% 6% 24%	3923
April	1st to 10th	Day	17% 11% 3 7% 4 5% 4 3 7% 7% 32%	2280
	11th to 20th	Day	19% 13% 5% 8% 3 4 4 3 4 6% 31%	2254
	21st to end	Day	19% 12% 3 9% 5% 5% 4 3 4 5% 30%	2444
May	1st to 10th	Day	17% 7% 2 6% 4 4 4 4 5% 6% 40%	4357
	11th to 20th	Day	14% 7% 2 6% 4 4 5% 4 5% 6% 42%	4399
	21st to end	Day	17% 8% 3 8% 5% 4 4 4 5% 7% 35%	4824
June	1st to 10th	Day	12% 6% 2 5% 4 4 5% 4 6% 8% 44%	2660
	11th to 20th	Day	13% 7% 2 7% 5% 5% 5% 4 7% 10% 36%	2660
	21st to end	Day	11% 5% 2 6% 5% 5% 5% 5% 8% 10% 40%	2660
July	1st to 10th	Day	11% 5% 2 6% 4 5% 6% 5% 7% 9% 39%	4440
	11th to 20th	Day	5% 3 1 4 4 3 4 4 6% 8% 58%	4440
	21st to end	Day	8% 5% 2 5% 4 4 5% 5% 6% 9% 48%	4813
August	1st to 10th	Day	12% 6% 2 6% 4 4 4 4 7% 9% 42%	4178
	11th to 20th	Day	11% 5% 2 6% 5% 5% 5% 5% 7% 8% 42%	4041
	21st to end	Day	12% 6% 2 7% 4 5% 5% 3 6% 7% 43%	4286
September	1st to 10th	Day	10% 5% 2 7% 4 4 4 4 6% 7% 46%	2280
	11th to 20th	Day	12% 5% 2 5% 4 4 5% 4 7% 7% 44%	2280
	21st to end	Day	15% 7% 2 5% 4 4 3 4 7% 7% 43%	1990
October	1st to 10th	Day	15% 8% 2 5% 4 4 4 4 5% 7% 42%	1900
	11th to 20th	Day	15% 13% 3 7% 4 4 4 4 5% 6% 35%	1900
	21st to end	Day	17% 12% 3 9% 5% 3 4 3 4 6% 35%	2013
November	1st to 10th	Day	12% 15% 4 8% 5% 4 4 3 5% 6% 34%	1623
	11th to 20th	Day	13% 13% 8% 10% 8% 4 5% 3 5% 6% 25%	1520
	21st to end	Day	14% 11% 5% 8% 5% 4 5% 3 6% 7% 32%	1520
December	1st to 10th	Day	11% 14% 5% 14% 9% 5% 4 5% 6% 5% 22%	1520
	11th to 20th	Day	12% 13% 7% 12% 7% 6% 5% 4 5% 5% 24%	1918
	21st to end	Day	22% 17% 5% 15% 6% 4 4 2 3 4 17%	2783
January	1st to 10th	Night	11% 13% 6% 15% 7% 4 4 3 4 5% 27%	4428
	11th to 20th	Night	6% 10% 5% 13% 8% 8% 7% 8% 7% 6% 21%	4440
	21st to end	Night	10% 18% 9% 14% 5% 5% 4 3 4 5% 22%	4619
February	1st to 10th	Night	5% 11% 5% 11% 7% 6% 5% 4 6% 7% 34%	2470
	11th to 20th	Night	6% 10% 4 10% 6% 6% 6% 4 4 7% 37%	2403
	21st to end	Night	10% 13% 4 8% 6% 5% 5% 4 5% 6% 34%	1955
March	1st to 10th	Night	8% 8% 3 7% 5% 4 4 4 5% 8% 45%	3606
	11th to 20th	Night	8% 8% 3 11% 6% 5% 5% 3 6% 6% 39%	3480
	21st to end	Night	24% 11% 4 11% 6% 3 3 2 4 4 29%	3707
April	1st to 10th	Night	17% 12% 3 7% 5% 4 4 3 4 6% 34%	1900
	11th to 20th	Night	21% 9% 4 7% 4 4 4 3 3 6% 35%	1875
	21st to end	Night	18% 10% 3 6% 5% 4 4 4 5% 7% 34%	1733
May	1st to 10th	Night	14% 8% 2 7% 5% 5% 4 3 5% 5% 41%	2548
	11th to 20th	Night	15% 6% 2 4 3 3 4 3 5% 7% 50%	2506
	21st to end	Night	11% 8% 3 7% 5% 4 4 4 6% 8% 40%	2743
June	1st to 10th	Night	11% 6% 2 5% 4 4 4 4 6% 8% 46%	1520
	11th to 20th	Night	9% 6% 2 7% 4 5% 4 3 6% 7% 47%	1520
	21st to end	Night	7% 5% 2 5% 4 4 7% 4 7% 8% 47%	1520
July	1st to 10th	Night	12% 4 1 5% 4 3 4 4 7% 9% 48%	2530
	11th to 20th	Night	4 3 1 4 3 3 4 3 7% 9% 58%	2530
	21st to end	Night	5% 3 1 5% 3 3 4 3 5% 8% 59%	2750
August	1st to 10th	Night	11% 5% 3 7% 4 4 3 3 6% 8% 47%	2759
	11th to 20th	Night	13% 5% 2 5% 4 3 4 4 6% 8% 46%	2798
	21st to end	Night	11% 7% 3 6% 5% 4 4 4 5% 7% 44%	3373
September	1st to 10th	Night	9% 4 2 5% 4 4 4 3 5% 8% 53%	1900
	11th to 20th	Night	8% 6% 2 5% 4 3 4 4 6% 7% 52%	1900
	21st to end	Night	14% 5% 2 5% 4 4 3 3 5% 7% 48%	2165
October	1st to 10th	Night	13% 6% 2 5% 3 3 4 3 6% 6% 48%	2280
	11th to 20th	Night	15% 10% 2 6% 4 4 4 4 4 6% 40%	2280
	21st to end	Night	17% 11% 3 6% 5% 4 4 3 5% 7% 35%	2584
November	1st to 10th	Night	14% 10% 3 7% 5% 4 4 3 6% 6% 39%	2553
	11th to 20th	Night	13% 12% 4 12% 5% 5% 4 4 5% 4 33%	2660
	21st to end	Night	13% 10% 4 9% 6% 4 4 3 6% 6% 35%	2660
December	1st to 10th	Night	9% 14% 5% 13% 7% 5% 5% 4 4 7% 27%	2660
	11th to 20th	Night	10% 15% 5% 12% 8% 6% 5% 4 5% 5% 24%	3279
	21st to end	Night	22% 18% 5% 10% 5% 4 3 3 4 4 20%	4884

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	64% 6% 9% 16% 4	2528
	11th to 20th	Day	64% 7% 10% 14% 5%	2530
	21st to end	Day	63% 6% 13% 14% 4	3043
February	1st to 10th	Day	51% 6% 13% 21% 9% 1	1710
	11th to 20th	Day	51% 5% 12% 24% 8% 1	1673
	21st to end	Day	51% 5% 12% 21% 10% 1	1498
March	1st to 10th	Day	44% 6% 16% 22% 12% 1	3275
	11th to 20th	Day	42% 6% 13% 29% 10% 1	3480
	21st to end	Day	61% 6% 8% 19% 5%	3923
April	1st to 10th	Day	50% 6% 10% 19% 13% 1	2280
	11th to 20th	Day	55% 5% 10% 18% 12% 1	2254
	21st to end	Day	56% 6% 11% 19% 8%	2444
May	1st to 10th	Day	42% 6% 12% 25% 13% 1	4398
	11th to 20th	Day	40% 7% 14% 24% 13% 1	4403
	21st to end	Day	47% 8% 11% 24% 10% 1	4837
June	1st to 10th	Day	35% 8% 14% 30% 12% 1	2660
	11th to 20th	Day	42% 8% 14% 22% 12% 1	2660
	21st to end	Day	36% 9% 18% 27% 9% 1	2660
July	1st to 10th	Day	38% 9% 18% 24% 11%	4371
	11th to 20th	Day	22% 7% 18% 35% 17% 1	4365
	21st to end	Day	30% 7% 15% 30% 17%	4662
August	1st to 10th	Day	37% 7% 15% 27% 13% 1	4163
	11th to 20th	Day	37% 7% 14% 32% 9%	4080
	21st to end	Day	40% 7% 15% 25% 12% 1	4285
September	1st to 10th	Day	35% 7% 14% 32% 11%	2280
	11th to 20th	Day	36% 8% 17% 30% 8%	2280
	21st to end	Day	39% 7% 14% 30% 9% 1	1990
October	1st to 10th	Day	29% 5% 10% 37% 19%	3160
	11th to 20th	Day	39% 6% 10% 27% 17% 2	3140
	21st to end	Day	46% 4 16% 25% 9%	3290
November	1st to 10th	Day	50% 6% 12% 18% 12% 1	1623
	11th to 20th	Day	59% 7% 12% 14% 7% 1	1520
	21st to end	Day	50% 7% 15% 21% 6% 2	1520
December	1st to 10th	Day	61% 7% 14% 13% 4	1520
	11th to 20th	Day	60% 7% 14% 14% 5% 1	1915
	21st to end	Day	71% 5% 8% 9% 7%	2783
January	1st to 10th	Night	59% 6% 11% 18% 6% 1	4428
	11th to 20th	Night	60% 8% 13% 14% 6%	4440
	21st to end	Night	64% 6% 9% 17% 4 1	4619
February	1st to 10th	Night	49% 6% 11% 23% 10% 2	2470
	11th to 20th	Night	46% 6% 14% 25% 9% 1	2404
	21st to end	Night	50% 6% 12% 20% 10% 1	1955
March	1st to 10th	Night	38% 6% 14% 25% 17% 1	3606
	11th to 20th	Night	44% 5% 11% 26% 14% 1	3480
	21st to end	Night	61% 4 8% 18% 9%	3707
April	1st to 10th	Night	50% 6% 7% 20% 16% 1	1900
	11th to 20th	Night	51% 5% 8% 19% 14% 2	1875
	21st to end	Night	47% 7% 10% 21% 13% 1	1733
May	1st to 10th	Night	44% 7% 12% 19% 18% 1	2572
	11th to 20th	Night	33% 6% 11% 27% 20% 3	2507
	21st to end	Night	40% 8% 14% 23% 14% 1	2751
June	1st to 10th	Night	32% 8% 15% 29% 14% 2	1520
	11th to 20th	Night	36% 7% 14% 23% 18% 2	1520
	21st to end	Night	31% 8% 16% 29% 13% 3	1520
July	1st to 10th	Night	31% 7% 22% 25% 13% 1	2490
	11th to 20th	Night	21% 7% 13% 38% 19% 2	2482
	21st to end	Night	23% 6% 16% 32% 21% 2	2662
August	1st to 10th	Night	36% 6% 12% 29% 14% 3	2750
	11th to 20th	Night	34% 7% 14% 32% 11% 1	2825
	21st to end	Night	38% 7% 16% 27% 10% 2	3373
September	1st to 10th	Night	30% 6% 15% 34% 14% 1	1900
	11th to 20th	Night	30% 6% 17% 32% 14%	1900
	21st to end	Night	35% 6% 13% 33% 12% 1	2165
October	1st to 10th	Night	25% 4 8% 35% 24% 4	3800
	11th to 20th	Night	37% 6% 12% 22% 22% 1	3779
	21st to end	Night	47% 5% 11% 25% 12%	4244
November	1st to 10th	Night	45% 6% 12% 23% 13% 1	2553
	11th to 20th	Night	54% 6% 13% 16% 11% 1	2660
	21st to end	Night	49% 5% 16% 22% 6% 1	2660
December	1st to 10th	Night	57% 6% 15% 17% 5%	2660
	11th to 20th	Night	60% 6% 12% 17% 5% 1	3281
	21st to end	Night	66% 5% 10% 14% 4	4884

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	14% 12% 36% 28% 7% 3	270
	11th to 20th	Day	15% 11% 40% 27% 6% 1	270
	21st to end	Day	14% 8% 44% 23% 10% 1	297
February	1st to 10th	Day	16% 14% 46% 18% 6% 1	270
	11th to 20th	Day	14% 19% 41% 20% 5% 1	270
	21st to end	Day	16% 15% 46% 23% 1	225
March	1st to 10th	Day	16% 15% 41% 19% 9% 1	270
	11th to 20th	Day	19% 11% 38% 23% 7% 1	270
	21st to end	Day	22% 15% 31% 20% 9% 3	355
April	1st to 10th	Day	22% 16% 36% 20% 5% 1	460
	11th to 20th	Day	28% 12% 27% 25% 7% 1	452
	21st to end	Day	25% 13% 31% 21% 8% 2	624
May	1st to 10th	Day	20% 13% 31% 26% 8% 1	653
	11th to 20th	Day	19% 12% 29% 26% 11% 4	675
	21st to end	Day	17% 11% 28% 25% 15% 4	734
June	1st to 10th	Day	11% 7% 29% 32% 18% 3	680
	11th to 20th	Day	12% 11% 36% 29% 10% 2	680
	21st to end	Day	12% 8% 32% 27% 16% 6%	680
July	1st to 10th	Day	8% 5% 25% 28% 24% 10%	671
	11th to 20th	Day	8% 6% 28% 29% 20% 9%	668
	21st to end	Day	7% 4 25% 35% 19% 9%	739
August	1st to 10th	Day	10% 6% 24% 33% 20% 7%	676
	11th to 20th	Day	13% 4 21% 31% 24% 6%	665
	21st to end	Day	12% 7% 25% 31% 20% 5%	606
September	1st to 10th	Day	13% 6% 31% 29% 16% 5%	490
	11th to 20th	Day	13% 6% 27% 33% 19% 3	490
	21st to end	Day	19% 10% 29% 25% 12% 5%	324
October	1st to 10th	Day	17% 15% 27% 23% 15% 3	300
	11th to 20th	Day	19% 19% 33% 23% 6%	300
	21st to end	Day	22% 15% 39% 15% 6% 2	330
November	1st to 10th	Day	20% 15% 34% 22% 7% 1	282
	11th to 20th	Day	20% 17% 36% 22% 4	270
	21st to end	Day	23% 13% 40% 19% 4	270
December	1st to 10th	Day	16% 12% 43% 20% 9%	270
	11th to 20th	Day	18% 19% 37% 21% 4	270
	21st to end	Day	27% 14% 38% 19% 1	297
January	1st to 10th	Night	13% 10% 39% 29% 8%	950
	11th to 20th	Night	16% 10% 39% 27% 7% 1	950
	21st to end	Night	17% 10% 36% 29% 7% 1	1045
February	1st to 10th	Night	12% 11% 42% 28% 7% 1	950
	11th to 20th	Night	10% 13% 43% 27% 6% 1	929
	21st to end	Night	17% 11% 36% 27% 8%	699
March	1st to 10th	Night	15% 13% 38% 26% 7% 1	685
	11th to 20th	Night	15% 11% 39% 28% 6%	570
	21st to end	Night	21% 11% 31% 25% 10% 2	627
April	1st to 10th	Night	22% 11% 36% 25% 6%	570
	11th to 20th	Night	26% 9% 31% 26% 7% 1	563
	21st to end	Night	22% 10% 30% 29% 8% 1	570
May	1st to 10th	Night	19% 10% 35% 30% 5% 1	570
	11th to 20th	Night	17% 9% 30% 32% 10% 2	561
	21st to end	Night	11% 7% 31% 37% 13% 1	617
June	1st to 10th	Night	12% 6% 30% 39% 12% 1	570
	11th to 20th	Night	10% 5% 34% 41% 9% 1	570
	21st to end	Night	8% 5% 26% 43% 16% 2	570
July	1st to 10th	Night	7% 2 23% 40% 26% 2	555
	11th to 20th	Night	7% 4 25% 42% 20% 1	552
	21st to end	Night	5% 2 23% 44% 23% 3	624
August	1st to 10th	Night	9% 3 16% 52% 19% 1	567
	11th to 20th	Night	14% 3 18% 38% 26% 2	564
	21st to end	Night	11% 4 24% 35% 22% 2	627
September	1st to 10th	Night	11% 5% 23% 41% 18% 3	570
	11th to 20th	Night	10% 5% 29% 36% 18% 2	570
	21st to end	Night	15% 9% 31% 30% 15% 1	674
October	1st to 10th	Night	16% 9% 31% 30% 13% 1	760
	11th to 20th	Night	20% 13% 31% 28% 7%	760
	21st to end	Night	23% 12% 30% 27% 8%	836
November	1st to 10th	Night	21% 10% 34% 29% 6% 1	843
	11th to 20th	Night	18% 13% 36% 26% 7%	950
	21st to end	Night	17% 16% 37% 24% 6%	950
December	1st to 10th	Night	14% 11% 37% 29% 7% 1	950
	11th to 20th	Night	19% 12% 38% 23% 7% 1	950
	21st to end	Night	23% 12% 37% 22% 6%	1045

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